Method of controlling electronic fuel injection to internal combustion engine

Abstract

A method of controlling fuel injection to an internal combustion engine by electronic circuits. A plurality of cylinders installed in the internal combustion engine are divided into two groups and two electronic circuits for controlling the respective two cylinder groups are provided. By comparing between the outputs of the two electronic circuits, whether the operations of the respective electronic circuits are normal or not is judged. The fuel injection controlled by the electronic circuit which has been judged to be abnormal is stopped, while the fuel injection controlled by the electronic circuit which has been judged to be normal is continued. Thus, the internal combustion engine is driven solely by one group of cylinders.

What is claimed is: 
     
       1. A method of controlling an electronic fuel injection to an internal combustion engine comprising the steps of: dividing a plurality of cylinders installed on said internal combustion engine into two groups;   providing a plurality of injectors on each group of cylinders, and dividing said injectors into two groups in correspondence with said two groups of cylinders;   providing two electronic circuits for controlling said two groups of injectors, respectively,   comparing the calculated outputs of fuel injection supplied from said two electronic control circuits, respectively;   judging whether or not the operations of said two electronic circuit are normal on the basis of the result of comparison; and   stopping the fuel injection which is controlled by the electronic circuit which has been judged to be abnormal, while continuing the fuel injection which is controlled by the electronic circuit which has been judged to be normal.   
     
     
       2. A method according to claim 1, wherein the results of calculation which are respectively output from said two electronic circuits are displayed to the driver and are judged by said driver whether or not the respective operations of said electronic circuits are normal. .Iadd. 
     
     
       3.  A system for controlling electronic fuel injection to an internal combustion engine, comprising: a plurality of cylinders installed on said internal combustion engine and divided into two groups;   a plurality of injectors for injecting fuel into said cylinders, respectively, said injectors being divided into two groups in correspondence with said two groups of cylinders;   two electronic circuits for controlling said two groups of injectors, respectively;   means for comparing the calculated outputs of fuel injection supplied from said two electronic control circuits, respectively, judging whether the operations of said two electronic circuits are normal on the basis of the result of said comparison and for stopping the fuel injection which is controlled by the electronic circuit which has been judged to be abnormal, while continuing the fuel injection which is controlled by the electronic circuit which has been judged to be normal. .Iaddend. .Iadd.4. A system according to claim 3, further comprising:   display means for displaying results of the calculation which are respectively output from said two electronic circuits to permit a driver to judge whether the respective operations of said electronic circuits are   
     
     
        normal. .Iaddend. .Iadd.5.  A system for controlling electronic fuel injection to an internal combustion engine, comprising: a plurality of cylinders installed on said internal combustion engine and divided into two groups of equal numbers of cylinders;   a plurality of injectors which inject fuel into said cylinders, respectively, and which are divided into two groups in correspondence with said two groups of cylinders;   two electronic control circuits being provided separately and functionally identical in association to said two groups of cylinders and injectors, said electronic control circuits each calculating fuel injection periods and delivering output signals representing the calculated injection periods to said two groups of injectors in order to separately control said two groups of injectors;   two electronic decision circuits each being provided in association to one and the other of said electronic control circuits and having functions of   comparing output signals of said electronic control circuits with each other;   if a difference between said output signals exceeds a predetermined value judging whether or not said output signals are within a predetermined tolerable range;   if both of said output signals are within the tolerable range, judging whether or not said output signals are changing with a lapse of time; and   deciding that the associated electronic control circuit is abnormal, if its output signal is judged to be outside the tolerable range or to be unchanged with the lapse of time, respectively; and   means for cutting off the outputs of the respective electronic control circuit decided to be abnormal. .Iaddend. .Iadd.6. A system according to claim 5, wherein said system, further comprises display means for displaying information of the electronic control circuit decided to be abnormal by the electronic decision circuit, and said means for cutting off is operated by a driver who recognizes the displayed information.   
     
     
        .Iaddend. .Iadd.7.  A method of controlling an electronic fuel injection to an internal combustion engine comprising the steps of: dividing a plurality of cylinders provided in said internal combustion engine into two groups;   providing a plurality of injectors for supplying fuel to said cylinders, and dividing said injectors into two groups in correspendence with said two groups of cylinders; and   providing first and second electronic circuits each calculating fuel injection amounts to be supplied to said cylinders based upon sensed engine operating conditions to control said two groups of injectors, respectively, said first and second electronic circuits having no portion thereof which operates in common to control the outputs of both said first   
     
     
        electronic circuit and said second electronic circuit. .Iaddend. .Iadd.8. A method of controlling an electronic fuel injection to an internal combustion engine comprising the steps of: dividing a plurality of cylinders provided in said internal combustion engine into first and second groups;   providing at least one interior for supplying fuel to the cylinders of said first group and at least one injector for supplying fuel to the cylinders of said second group; and   providing a first electronic circuit for calculating fuel injection amounts based upon sensed engine operating conditions to control said at least one injector for supplying fuel to said cylinders of said first group and a second electronic circuit for calculating fuel injection amounts based upon sensed engine operating conditions to control said at least one injector for supplying fuel to said cylinders of said second group, said first and second electronic circuits having no portion thereof which operates in common to control the outputs of both said first electronic circuit and said second electronic circuit. .Iaddend. .Iadd.9. A method of controlling an electronic fuel injection to an internal combustion engine comprising the steps of:   dividing a plurality of cylinders provided in said internal combustion engine into two groups;   providing a plurality of injectors for supplying fuel to said cylinders, and dividing said injectors into two groups in correspondence with said two groups of cylinders;   providing two electronic circuits for controlling said two groups of injectors, respectively;   judging whether or not the operations of said two electronic circuits are normal; and   stopping the supply of fuel which is controlled by the electronic circuit which has been judged to be abnormal, while continuing the supply of fuel which is controlled by the electronic circuit which has been judged to be normal. .Iaddend. .Iadd.10. A method of controlling an electronic fuel injection to an internal combustion engine comprising the steps of:   dividing a plurality of cylinders provided in said internal combustion engine into first and second groups;   providing at least one injector for supplying fuel to the cylinders of said first group and at least one injector for supplying fuel to the cylinders of said second group;   providing a first electronic circuit for controlling said at least one injector for supplying fuel to said cylinders of said first group and a second electronic circuit for controlling said at least one injector for supplying fuel to said cylinders of said second group;   judging whether or not the operations of said first and second electronic circuits are normal; and   stopping the supply of fuel which is controlled by the electronic circuit which has been judged to be abnormal, while continuing the supply of fuel which is controlled by the electronic circuit which has been judged to be normal. .Iaddend. .Iadd.11. A method of controlling an electronic fuel injection to an internal combustion engine comprising the steps of:   dividing a plurality of cylinders provided in said internal combustion engine into two groups;   providing a plurality of injectors for supplying fuel to said cylinders, and dividing said injectors into two groups in correspondence with said two groups of cylinders;   providing two electronic circuits for controlling said two groups of injectors, respectively;   judging whether or not the operation of each of said two electronic circuits is normal on the basis of a time-sequential change of the calculated output of fuel injection delivered out of each of said electronic circuits; and   stopping the supply of fuel which is controlled by the electronic circuit which has been judged to be abnormal, while continuing the supply of fuel which is controlled by the electronic circuit which has been judged to be normal. .Iaddend. .Iadd.12. A method of controlling an electronic fuel injection to an internal combustion engine, comprising the steps of:   dividing a plurality of cylinders provided in said internal combustion engine into first and second groups;   providing at least one injector for supplying fuel to the cylinders of said first group and at least one injector for supplying fuel to the cylinders of said second group;   providing a first electronic circuit for controlling said at least one injector for supplying fuel to said cylinders of said first group and a second electronic circuit for controlling said at least one injector for supplying fuel to said cylinders of said second group;   judging whether or not the operation of each of said first and second electronic circuits is normal on the basis of a time-sequential change of the calculated output of fuel injection delivered out of each of said first and second electronic circuits; and   stopping the supply of fuel which is controlled by the electronic circuit which has been judged to be abnormal, while continuing the supply of fuel which is controlled by the electronic circuit which has been judged to be normal. .Iaddend. .Iadd.13. A system for controlling an electronic fuel injection to an internal combustion engine comprising:   a plurality of cylinders provided in said internal combustion engine and divided into a plurality of groups;   a plurality of injectors for supplying said cylinders with fuel, respectively, said injectors being divided into a plurality of groups in correspondence with said groups of cylinders; and   a plurality of electronic circuits each calculating fuel injection amounts to be supplied to said cylinders based upon sensed engine operating conditions to control said groups of injectors, respectively, said electronic circuits having no portion thereof which operates in common with another electronic circuit to control the outputs of said plurality of electronic circuits. .Iaddend. .Iadd.14. A system according to claim 13, wherein said plurality of groups are two groups, and said plurality of electronic circuits are two electronic circuits. .Iaddend. .Iadd.15. A system for controlling an electronic fuel injection to an internal combustion engine comprising:   a plurality of cylinders provided in said internal combustion engine and divided into a plurality of groups;   a plurality of injectors for supplying said cylinders with fuel, respectively, said injectors being divided into a plurality of groups in correspondence with said groups of cylinders;   a plurality of sensors for detecting information necessary for operating said internal combustion engine; and   a plurality of electronic circuits for controlling said gropus of injectors, respectively, on the basis of outputs of said sensors, said electronic circuits having no portion thereof which operates in common with another electronic circuit to control the outputs of said plurality   
     
     
        of electronic circuits. .Iaddend. .Iadd.16.  A system for controlling an electronic fuel injection to an internal combustion engine comprising: a plurality of cylinders provided in said internal combustion engine and divided into a plurality of groups;   a plurality of injectors for supplying said cylinders with fuel, respectively, said injectors being divided into a plurality of groups in correspondence with said groups of cylinders;   a plurality of sensors for detecting information necessary for operating said internal combustion engine; and   a plurality of electronic circuits for controlling said groups of injectors, respectively, on the basis of outputs of said sensors, said electronic circuits having no portion thereof which operates in common with another electronic circuit to control the outputs of said plurality of electronic circuits;   wherein at least one of said sensors is utilized for said plurality of electronic circuits in common so that an output of said at least one of sensors is applied to said plurality of electronic circuits. .Iaddend. .Iadd.17. A system for controlling an electronic fuel injection to an internal combustion engine comprising:   a plurality of cylinders provided in said internal combustion engine and divided into a plurality of groups;   a plurality of injectors for supplying said cylinders with fuel, respectively, said injectors being divided into a plurality of groups in correspondence with said groups of cylinders;   a plurality of sensors for detecting information necessary for operating said internal combustion engine;   a plurality of electronic circuits for controlling said groups of injectors, respectively, on the basis of outputs of said sensors, said second electronic circuits having no portion thereof which operates in common with another electronic circuit to control the outputs of said plurality of electronic circuits; and   detection means for detecting abnormality of said electronic circuits.   
     
     
        .Iaddend. .Iadd.18.  A system according to claim 17, wherein said internal combustion engine is operated with the group of injectors controlled by the electronic circuit other than the electronic circuit detected to be abnormal. .Iaddend. .Iadd.19. A system for controlling an electronic fuel injection to an internal combustion engine comprising: a plurality of cylinders provided in said internal combustion engine and divided into a plurality of groups;   a plurality of injectors for supplying said cylinders with fuel, respectively, said injectors being divided into a plurality of groups in correspondence with said groups of cylinders;   a plurality of sensors for detecting information necessary for operating said internal combustion engine;   a plurality of electronic circuits for controlling said groups of injectors, respectively, on the basis of outputs of said sensors, said electronic circuits having no portion thereof which operates in common with another electronic circuit to control the outputs of said plurality of electronic circuits;   detection means for detecting abnormality of said electronic circuits; and   means for giving a driver information of the electronic circuit detected to   
     
     
        be abnormal by said detection means. .Iaddend. .Iadd.20.  A system according to claim 19, wherein said electronic circuit detected to be abnormal is able to be replaced with a spare electronic circuit by the driver. .Iaddend. .Iadd.21. A system for controlling an electronic fuel injection to an internal combustion engine comprising: a plurality of cylinders provided in said internal combustion engine and divided into a plurality of groups;   a plurality of injectors for supplying said cylinders with fuel, respectively, said injectors being divided into a plurality of groups in correspondence with said groups of cylinders;   a plurality of sensors for detecting information necessary for operating said internal combustion engine;   a plurality of electronic circuits for controlling said groups of injectors, respectively, on the basis of outputs of said sensors, said electronic circuits having no portion thereof which operates in common with another electronic circuit to control the outputs of said plurality of electronic circuits; and   detection means for detecting abnormality of said electronic circuits;   wherein at least one of said sensors is utilized for said plurality of electronic circuits in common so that an output of said at least one of sensors is applied to said plurality of electronic circuits. .Iaddend.   
     
     
        .Iadd.22.  A system according to claim 21, wherein said internal combustion engine is operated with the group of injectors controlled by the electronic circuit other than the electronic circuit detected to be abnormal. .Iaddend. .Iadd.23. A system for controlling an electronic fuel injection to an internal combustion engine comprising: a plurality of cylinders provided in said internal combustion engine and divided into a plurality of groups;   a plurality of injectors for supplying said cylinders with fuel, respectively, said injectors being divided into a plurality of groups in correspondence with said groups of cylinders;   a plurality of sensors for detecting information necessary for operating said internal combustion engine;   a plurality of electronic circuits for controlling said groups of injectors, respectively, on the basis of outputs of said sensors, said electronic circuits having no portion thereof which operates in common with another electronic circuit to control the outputs of said plurality of electronic circuits;   detection means for detecting abnormality of said electronic circuits; and   means for giving a driver information of the electronic circuit detected to be abnormal by said detection means;   wherein at least one of said sensors is utilized for said plurality of electronic circuits in common so that an output of said at least one of sensors is applied to said plurality of electronic circuits. .Iaddend. .Iadd.24. A system according to claim 23, wherein said electronic circuit detected to be abnormal is able to be replaced with a spare electronic circuit by the driver. .Iaddend. .Iadd.25. A system for controlling an electronic fuel injection to an internal combustion engine comprising:   a plurality of cylinders provided in said internal combustion engine and divided into first and second groups;   at least one injector for supplying the cylinders of said first group with fuel;   at least one injector for supplying the cylinders of said second group with fuel;   a first electronic circuit for calculating fuel injection amounts based upon sensed engine operating conditions to control said at least one injector for supplying said cylinders of said first group with fuel; and   a second electronic circuit for calculating fuel injection amounts based upon sensed engine operating conditions to control said at least one injector for supplying said cylinders of said second group with fuel, said first and second electronic circuits having no portion thereof which operates in common to control the outputs of both said first electronic circuit and said second electronic circuit. .Iaddend. .Iadd.26. A system for controlling an electronic fuel injection to an internal combustion engine comprising:   a plurality of cylinders provided in said internal combustion engine and divided into first and second groups;   at least one injector for supplying the cylinders of said first group with fuel;   at least one injector for supplying the cylinders of said second group with fuel;   a plurality of sensors for detecting information necessary for operating said internal combustion engine;   a first electronic circuit for controlling said at least one injector for supplying said cylinders of said first group with fuel, on the basis of outputs of sensors in said plurality of sensors; and   a second electronic circuit for controlling said at least one injector for supplying said cylinders of said second group with fuel, on the basis of outputs of sensors in said plurality of sensors, the first and second electronic circuits having no portion which operates in common to control the outputs of both said first electronic circuit and said second   
     
     
        electronic circuit. .Iaddend. .Iadd.27.  A system for controlling an electronic fuel injection to an internal combustion engine comprising: a plurality of cylinders provided in said internal combustion engine and divided into first and second groups;   at least one injector for supplying the cylinders of said first group with fuel;   at least one injector for supplying the cylinders of said second group with fuel;   a plurality of sensors for detecting information necessary for operating said internal combustion engine;   a first electronic circuit for controlling said at least one injector for supplying said cylinders of said first group with fuel, on the basis of outputs of sensors in said plurality of sensors; and   a second electronic circuit for controlling said at least one injector for supplying said cylinders of said second group with fuel, on the basis of outputs of sensors in said plurality of sensors, the first and second electronic circuits having no portion which operates in common to control the outputs of both said first electronic circuit and said second electronic circuit;   wherein at least one of said sensors is utilized for said first and second electronic circuits in common so that an output of said at least one of sensors is applied to said first and second electronic circuits. .Iaddend.   
     
     
        .Iadd.28.  A system for controlling an electronic fuel injection to an internal combustion engine comprising: a plurality of cylinders provided in said internal combustion engine and divided into first and second groups;   at least one injector for supplying the cylinders of said first group with fuel;   at least one injector for supplying the cylinders of said second group with fuel;   a plurality of sensors for detecting information necessary for operating said internal combustion engine;   a first electronic circuit for controlling said at least one injector for supplying said cylinders of said first group with fuel, on the basis of outputs of sensors in said plurality of sensors;   a second electronic circuit for controlling said at least one injector for supplying said cylinders of said second group with fuel, on the basis of outputs of sensors in said plurality of sensors, the first and second electronic circuits having no portion which operates in common to control the outputs of both said first electronic circuit and said second electronic circuit; and   detection means for detecting abnormality of said first and second electronic circuits. .Iaddend. .Iadd.29. A system according to claim 28, wherein said internal combustion engine is operated with the at least one injector controlled by the electronic circuit other than the electronic circuit detected to be abnormal. .Iaddend. .Iadd.30. A system for controlling an electronic fuel injection to an internal combustion engine comprising:   a plurality of cylinders provided in said internal combustion engine and divided into first and second groups;   at least one injector for supplying the cylinders of said first group with fuel;   at least one injector for supplying the cylinders of said second group with fuel;   a plurality of sensors for detecting information necessary for operating said internal combustion engine;   a first electronic circuit for controlling said at least one injector for supplying said cylinders of said first group with fuel, on the basis of outputs of sensors in said plurality of sensors;   a second electronic circuit for controlling said at least one injector for supplying said cylinders of said second group with fuel, on the basis of outputs of sensors in said plurality of sensors, the first and second electronic circuits having no portion which operates in common to control the outputs of both said first electronic circuit and said second electronic circuit;   detection means for detecting abnormality of said first and second electronic circuits; and   means for giving a driver information of the electronic circuit detected to be abnormal by said detection means. .Iaddend. .Iadd.31. A system according to claim 30, wherein said electronic circuit detected to be abnormal is able to be replaced with a spare electronic circuit by the driver. .Iaddend. .Iadd.32. A system for controlling, an electronic fuel injection to an internal combustion engine comprising:   a plurality of cylinders provided in said internal combustion engine and divided into first and second groups;   at least one injector for supplying the cylinders of said first group with fuel;   at least one injector for supplying the cylinders of said second group with fuel;   a plurality of sensors for detecting information necessary for operating said internal combustion engine;   a first electronic circuit for controlling said at least one injector for supplying said cylinders of said first group with fuel, on the basis of outputs of sensors in said plurality of sensors;   a second electronic circuit for controlling said at least one injector for supplying said cylinders of said second group with fuel, on the basis of outputs of sensors in said plurality of sensors, the first and second electronic circuits having no portion which operates in common to control the outputs of both said first electronic circuit and said second electronic circuit; and   detection means for detecting abnormality of said first and second electronic circuits;   wherein at least one of said sensors is utilized for said first and second electronic circuits in common so that an output of said at least one of sensors is applied to said first and second electronic circuits. .Iaddend.   
     
     
        .Iadd.33.  A system according to claim 32, wherein said internal combustion engine is operated with the at least one injector controlled by the electronic circuit other than the electronic circuit detected to be abnormal. .Iaddend. .Iadd.34. A system for controlling an electronic fuel injection to an internal combustion engine comprising: a plurality of cylinders provided in said internal combustion engine and divided into first and second groups;   at least one injector for supplying the cylinders of said first group with fuel;   at least one injector for supplying the cylinders of said second group with fuel;   a plurality of sensors for detecting information necessary for operating said internal combustion engine;   a first electronic circuit for controlling said at least one injector for supplying said cylinders of said first group with fuel, on the basis of outputs of sensors in said plurality of sensors;   a second electronic circuit for controlling said at least one injector for supplying said cylinders of said second group with fuel, on the basis of outputs of sensors in said plurality of sensors, the first and second electronic circuits having no portion which operates in common to control the outputs of both said first electronic circuit and said second electronic circuit;   detection means for detecting abnormality of said first and second electronic circuits; and   means for giving a driver information of the electronic circuit detected to be abnormal by said detection means;   wherein at least one of said sensors is utilized for said first and second electronic circuits in common so that an output of said at least one of sensors is applied to said first and second electronic circuits. .Iaddend.   
     
     
        .Iadd.35.  A system according to claim 34, wherein said electronic circuit detected to be abnormal is able to be replaced with a spare electronic circuit by the driver. .Iaddend. .Iadd.36. A system for controlling an electronic fuel injection to an internal combustion engine comprising: a plurality of cylinders provided in said internal combustion engine and divided into two groups;   a plurality of injectors for supplying said cylinders with fuel, respectively, said injectors being divided into two groups in correspondence with said two groups of cylinders;   two electronic circuits for controlling said two groups of injectors, respectively;   decision circuits for judging whether or not the operations of said two electronic circuits are normal; and   means for stopping the supply of fuel which is controlled by an electronic circuit which has been judged to be abnormal, while continuing the supply of fuel which is controlled by an electronic circuit which has been judged to be normal. .Iaddend. .Iadd.37. A system according to claim 36, wherein said means for stopping comprises a switch in a vehicle. .Iaddend.   
     
     
        .Iadd.  .  A system for controlling an electronic fuel injection to an internal combustion engine comprising: a plurality of cylinders provided in said internal combustion engine and divided into two groups;   a plurality of injectors for supplying said cylinders with fuel, respectively, said injectors being divided into two groups in correspondence with said two groups of cylinders;   two electronic circuits for controlling said two groups of injectors, respectively;   means for judging whether or not the operations of said two electronic circuits are normal;   means for stopping the supply of fuel which is controlled by the electronic circuit which has been judged to be abnormal, while continuing the supply of fuel which is controlled by the electronic circuit which has been judged to be normal; and   means for giving a driver information of the electronic circuit which has been judged to be abnormal. .Iaddend. .Iadd.39. A system according to claim 38, wherein said means for stopping comprises a switch in a vehicle. .Iaddend. .Iadd.40. A system according to claim 38, wherein said electronic circuit which has been judged to be abnormal is able to be replaced with a spare electronic circuit by the driver. .Iaddend. .Iadd.41. A system for controlling an electronic fuel injection to an internal combustion engine comprising:   a plurality of cylinders provided in said internal combustion engine and divided into first and second groups;   at least one injector for supplying the cylinders of said first group with fuel;   at least one injector for supplying the cylinders of said second group with fuel;   a first electronic circuit for controlling said at least one injector for supplying said cylinders of said first group with fuel;   a second electronic circuit for controlling said at least one injector for supplying said cylinders of said second group with fuel;   means for judging whether or not the operations of said first and second electronic circuits are normal; and   means for stopping the supply of fuel which is controlled by the electronic circuit which has been judged to be abnormal, while continuing the supply of fuel which is controlled by the electronic circuit which has been judged to be normal. .Iaddend. .Iadd.42. A system according to claim 41, wherein said means for stopping comprises a switch in a vehicle. .Iaddend. .Iadd.43. A system for controlling an electronic fuel injection to an internal combustion engine comprising:   a plurality of cylinders provided in said internal combustion engine and divided into first and second groups;   at least one injector for supplying the cylinders of said first group with fuel;   at least one injector for supplying the cylinders of said second group with fuel;   a first electronic circuit for controlling said at least one injector for supplying said cylinders of said first group with fuel;   a second electronic circuit for controlling said at least one injector for supplying said cylinders of said second group with fuel;   means for judging whether or not the operations of said first and second electronic circuits are normal;   means for stopping the supply of fuel which is controlled by the electronic circuit which has been judged to be abnormal, while continuing the supply of fuel which is controlled by the electronic circuit which has been judged to be normal; and   means for giving a driver information of the electronic circuit which has   
     
     
        been judged to be abnormal. .Iaddend. .Iadd.44.  A system according to claim 43, wherein said means for stopping comprises a switch in a vehicle. .Iaddend. .Iadd.45. A system according to claim 43, wherein said electronic circuit which has been judged to be abnormal is able to be replaced with a spare electronic circuit by the driver. .Iaddend. .Iadd.46. A system for controlling an electronic fuel injection to an internal combustion engine comprising: a plurality of cylinders provided in said internal combustion engine and divided into two groups;   a plurality of injectors for supplying said cylinders with fuel, respectively, said injectors being divided into two groups in correspondence with said two groups of cylinders;   two electronic circuits for controlling said two groups of injectors, respectively;   means for judging whether or not the operation of each of said two electronic circuits is normal on the basis of a time-sequential change of the calculated output of fuel injection delivered out of each of said electronic circuits; and   means for stopping the supply of fuel which is controlled by the electronic circuit which has been judged to be abnormal, while continuing the supply of fuel which is controlled by the electronic circuit which has been   
     
     
        judged to be normal. .Iaddend. .Iadd.47.  A system according to claim 46, wherein said means for stopping comprises a switch in a vehicle. .Iaddend. .Iadd.48. A system for controlling an electronic fuel injection to an internal combustion engine comprising: a plurality of cylinders provided in said internal combustion engine and divided into two groups;   a plurality of injectors for supplying said cylinders with fuel, respectively, said injectors being divided into two groups in correspondence with said two groups of cylinders;   two electronic circuits for controlling said two groups of injectors, respectively;   means for judging whether or not the operation of each of said two electronic circuits is normal on the basis of a time-sequential change of the calculated output of fuel injection delivered out of each of said electronic circuit;   means for stopping the supply of fuel which is controlled by the electronic circuit which has been judged to be abnormal, while continuing the supply of fuel which is controlled by the electronic circuit which has been judged to be normal; and   means for giving a driver information of the electronic circuit which has been judged to be abnormal. .Iaddend. .Iadd.49. A system according to claim 48, wherein said means for stopping comprises a switch in a vehicle. .Iaddend. .Iadd.50. A system according to claim 48, wherein said electronic circuit which has been judged to be abnormal is able to be replaced with a spare electronic circuit by the driver. .Iaddend. .Iadd.51. A system for controlling an electronic fuel injection to an internal combustion engine comprising:   a plurality of cylinders provided in said internal combustion engine and divided into first and second groups;   at least one injector for supplying the cylinders of said first group with fuel;   at least one injector for supplying the cylinders of said second group with fuel;   a first electronic circuit for controlling said at least one injector for supplying said cylinders of said first group with fuel;   a second electronic circuit for controlling said at least one injector for supplying said cylinders of said second group with fuel;   means for judging whether or not the operation of each of said first and second electronic circuits is normal on the basis of a time-sequential change of the calculated output of fuel injection delivered out of each of said first and second electronic circuits; and   means for stopping the supply of fuel which is controlled by the electronic circuit which has been judged to be abnormal, while continuing the supply of fuel which is controlled by the electronic circuit which has been   
     
     
        judged to be normal. .Iaddend. .Iadd.52.  A system according to claim 51, wherein said means for stopping comprises a switch in a vehicle. .Iaddend. .Iadd.53. A system for controlling an electronic fuel injection to an internal combustion engine comprising: a plurality of cylinders provided in said internal combustion engine and divided into first and second groups;   at least one injector for supplying the cylinders of said first group with fuel;   at least one injector for supplying the cylinders of said second group with fuel;   a first electronic circuit for controlling said at least one injector for supplying said cylinders of said first group with fuel;   a second electronic circuit for controlling said at least one injector for supplying said cylinders of said second group with fuel;   means for judging whether or not the operation of each of said first and second electronic circuits is normal on the basis of a time-sequential change of the calculated output of fuel injection delivered out of each of said first and second electronic circuits;   means for stopping the supply of fuel which is controlled by the electronic circuit which has been judged to be abnormal, while continuing the supply of fuel which is controlled by the electronic circuit which has been judged to be normal; and   means for giving a driver information of the electronic circuit which has   
     
     
        been judged to be abnormal. .Iaddend. .Iadd.54.  A system according to claim 53, wherein said means for stopping comprises a switch in a vehicle. .Iaddend. .Iadd.55. A system according to claim 53, wherein said electronic circuit which has been judged to be abnormal is able to be replaced with a spare electronic circuit by the driver. .Iaddend. .Iadd.56. A system according to claim 4, wherein the electronic circuit judged to be abnormal is able to be replaced with a spare electronic circuit by the driver. .Iaddend. .Iadd.57. A system according to claim 6, wherein said electronic circuit decided to be abnormal, is able to be replaced with a spare circuit by the driver. .Iaddend. .Iadd.58. A system for controlling an electric fuel injection to an internal combustion engine having a plurality of cylinders, comprising: at least one injector for supplying some of said cylinders with fuel;   at least one injector for supplying remaining cylinders with fuel; and   respective electronic circuits each calculating fuel injection amounts to be supplied to said cylinders based upon sensed engine operating conditions to control each of the injectors, independently, said electronic circuits having no portion thereof which operates in common with another electronic circuit to control the outputs of all electronic circuits. .Iaddend. .Iadd.59. A system for controlling an electric fuel injection to an internal combustion engine having a plurality of cylinders, comprising:   at least one injector for supplying one group of said cylinders with fuel;   at least one injector for supplying the other group of said cylinders with fuel;   respective electronic circuits for controlling each of said injectors, independently, said electronic circuits having no portion thereof which operates in common with another electronic circuit to control the outputs of all electronic circuits; and   two electronic decision circuits for judging whether or not the operation   
     
     
        of each of said electronic circuits is normal. .Iaddend. .Iadd.60.  A system for controlling electronic fuel injection to an internal combustion engine comprising: a plurality of cylinders provided in said internal combustion engine and divided into a plurality of groups;   a plurality of injectors for supplying said cylinders with fuel, respectively, said injectors being divided into a plurality of groups in correspondence with said groups of cylinders;   a plurality of sensors for detecting information necessary for operating said internal combustion engine;   a plurality of electronic circuits for controlling said groups of injectors, respectively, on the basis of outputs of said sensors, said electronic circuits having no portion thereof which operates in common with another electronic circuit to control the outputs of said plurality of electronic circuits; and   detection means provided in correspondence to the respective electronic circuits for detecting an abnormality of said electronic circuits. .Iaddend. .Iadd.61. An internal combustion engine comprising:   a plurality of cylinders arranged to form cylinder banks of V-type;   control circuits each of which is provided in correspondence to a respective one of said cylinder banks to control actions of cylinders in each of the cylinder banks;   fuel injection and ignition systems each of which is provided in correspondence to a respective one of cylinder banks;   a plurality of sensors for detecting conditions in the actions of cylinders in each of the cylinder banks and for supplying outputs representing detected conditions to said control circuits; and   means for stopping the supply of fuel to the cylinder bank which is controlled by a control circuit if said control circuit is detected to be abnormal. .Iaddend. .Iadd.62. A system for controlling an electronic fuel injection to an internal combustion engine comprising:   a plurality of cylinders provided in said internal combustion engine and divided into two groups;   a plurality of injectors for supplying said cylinders with fuel, respectively, said injectors being divided into two groups in corresponding with said two groups of cylinders;   two substantially identical electronic circuits for controlling said two groups of injectors, respectively;   decision circuits for judging whether or not the operations of said two electronic circuits are normal on the basis of comparison of a calculated output of fuel injection delivered out of each of said electronic circuits with tolerance limit values in each of said circuits; and   means for stopping the supply of fuel which is controlled by the electronic circuit which has been judged to be abnormal, while continuing the supply of fuel which is controlled by the electronic circuit which has been   
     
     
        judged to be normal. .Iaddend. .Iadd.63.  A system for controlling an electronic fuel injection to an internal combustion engine comprising: a plurality of cylinders provided in said internal combustion engine and divided into two groups;   a plurality of injectors for supplying said cylinders with fuel, respectively, said injectors being divided into two groups in correspondence with said two groups of cylinders;   two substantially identical electronic circuits for controlling said two groups of injectors, respectively;   decision circuits for judging whether or not the operations of said two electronic circuits are normal on the basis of comparison of a calculated output of fuel injection delivered out of each of said electronic circuit with tolerance limit values in each of said circuits;   means for stopping the supply of fuel which is controlled by the electronic circuit which has been judged to be abnormal, while continuing the supply of fuel which is controlled by the electronic circuit which has been judged to be normal; and   means for giving a driver information of the electronic circuit which has been judged to be abnormal. .Iaddend. .Iadd.64. A system for controlling an electronic fuel injection to an internal combustion engine comprising:   a plurality of cylinders provided in said internal combustion engine and divided into first and second groups;   at least one injector for supplying the cylinders of said first group with fuel;   at least one injector for supplying the cylinders of said second group with fuel;   a first electronic circuit for controlling said at least one injector for supplying said cylinders of said first group with fuel;   a second electronic circuit, which is substantially identical to said first electronic circuit, for controlling said at least one injector for supplying said cylinders of said second group with fuel;   means for judging whether or not the operations of said first and second electronic circuits are normal on the basis of comparison of a calculated output of fuel injection delivered out of each of said electronic circuits with tolerance limit values in each of said circuits; and   means for stopping the supply of fuel which is controlled by the electronic circuit which has been judged to be abnormal, while continuing the supply of fuel which is controlled by the electronic circuit which has been   
     
     
        judged to be normal. .Iaddend. .Iadd.65.  A system for controlling an electronic fuel injection to an internal combustion engine comprising: a plurality of cylinders provided in said internal combustion engine and divided into first and second groups;   at least one injector for supplying the cylinders of said first group with fuel;   at least one injector for supplying the cylinders of said second group with fuel;   a first electronic circuit for controlling said at least one injector for supplying said cylinders of said first group with fuel;   a second electronic circuit, which is substantially identical to said first electronic circuit, for controlling said at least one injector for supplying said cylinders of said second group with fuel;   means for judging whether or not the operation of said first and second electronic circuits are normal on the basis of comparison of a calculated output of fuel injection delivered out of each of said electronic circuits with tolerance limit values in each of said circuits;   means for stopping the supply of fuel which is controlled by the electronic circuit which has been judged to be abnormal, while continuing the supply of fuel which is controlled by the electronic circuit which has been judged to be normal; and   means for giving a driver information of the electronic circuit which has   
     
     
        been judged to be abnormal. .Iaddend. .Iadd.66.  A system for controlling an electric fuel injection to an internal combustion engine having a plurality of cylinders, comprising: at least one injector for supplying a part of said cylinders with fuel;   at least one injector for supplying the rest part of said cylinders with fuel;   two substantially identical electronic circuits for controlling said two groups of injectors, respectively;   decision circuits for judging whether or not the operations of said two electronic circuits are normal on the basis of comparison of a calculated output of fuel injection delivered out of each of said electronic circuits with tolerance limit values in each of said circuits; and   means for giving a driver information indicating the electronic circuit   
     
     
        which has been judged to be abnormal. .Iaddend. .Iadd.67.  A method of controlling an electronic fuel injection to an internal combustion engine comprising the steps of: dividing a plurality of cylinders provided in said internal combustion engine into two groups;   providing a plurality of injectors for supplying fuel to said cylinders, and dividing said injectors into two groups in correspondence with said two groups of cylinders;   providing two electronic circuits each calculating fuel injection amounts to be supplied to said cylinders based upon sensed engine operating conditions to control said two groups of injectors, respectively;   judging whether or not the operation of each of said two electronic circuits is normal; and   executing a predetermined operation for fuel supply by the electronic circuit when the electronic circuit has been judged to be abnormal.   
     
     
        .Iaddend. .Iadd.68.  A method of controlling an electronic fuel injection to an internal combustion engine comprising the steps of: dividing a plurality of cylinders provided in said internal combustion engine into first and second groups;   providing at least one injector for supplying fuel to the cylinders of said first group and at least one injector for supplying fuel to the cylinders of said second group;   providing a first electronic circuit for calculating fuel injection amounts based upon sensed engine operating conditions to control said at least one injector for supplying fuel to said cylinders of said first group and a second electronic circuit for calculating fuel injection amounts based upon sensed engine operating conditions to control said at least one injector for supplying fuel to said cylinders of said second group;   judging whether or not the operation of each of said first and second electronic circuits is normal; and   executing a predetermined operation for fuel supply by the electronic circuit when the electronic circuit has been judged to be abnormal.   
     
     
        .Iaddend. .Iadd.69.  A system for controlling an electronic fuel injection to an internal combustion engine comprising: a plurality of cylinders provided in said internal combustion engine and divided into a plurality of groups;   a plurality of injectors for supplying said cylinders with fuel, respectively, said injectors being divided into a plurality of groups in correspondence with said groups of cylinders;   a plurality of electronic circuits each calculating fuel injection amounts to be supplied to said cylinders based upon sensed engine operation conditions to control said groups of injectors, respectively;   means for judging whether or not the operation of each of said electronic circuits is normal; and   means for executing a predetermined operation for fuel supply by the electronic circuit which has been judged to be abnormal. .Iaddend. .Iadd.70. A system for controlling an electronic fuel injection to an internal combustion engine comprising:   a plurality of cylinders provided in said internal combustion engine and divided into first and second groups;   at least one injector for supplying the cylinders of said first group with fuel;   at least one injector for supplying the cylinders of said second group with fuel;   a first electronic circuit for calculating fuel injection amounts based upon sensed engine operating conditions to control said at least one injector for supplying said cylinders of said first group with fuel;   a second electronic circuit for calculating fuel injection amounts based upon sensed engine operating conditions to control said at least one injector for supplying said cylinders to said second group with fuel;   means for judging whether or not the operation of each of said first and second electronic circuits is normal; and   means for executing a predetermined operation for fuel supply by the electronic circuit which has been judged to be abnormal. .Iaddend.   
     
     
        .Iadd.  .  A system for controlling an electronic fuel injection to an internal combustion engine having a plurality of cylinders divided into two groups symmetrically arranged so that the combustion in each of said cylinders drives a common crankshaft, said system comprising: a plurality of injectors for supplying said two groups of cylinders with fuel, respectively, said injectors being divided into two groups in correspondence with said two groups of cylinders;   a first electronic circuit for calculating fuel injection amounts based upon sensed engine operating conditions to control the operation of one of said two groups of injectors;   a second electronic circuit for calculating fuel injection amounts based upon sensed engine operating conditions to control the operation of the other of said two groups of injectors; and   means for continuing the operation of one of said two groups of the injectors when an the abnormality occurs in the output of the electronic circuit controlling the operation of the other groups of the injectors.   
     
     
        .Iaddend. .Iadd.72.  A system for controlling an electronic fuel injection to an internal combustion engine having a plurality of cylinders divided into two groups symmetrically arranged so that the combustion in each of said cylinders drives a common crankshaft, said system comprising two parts each of which includes: one of the two groups of cylinders;   at least one injector for supplying said one of the two groups of cylinders with fuel; and   an electronic circuit for calculating fuel injection amounts based upon sensed engine operating conditions to control said at least one injector;   wherein each of said two parts of the system is able to operate independently of the other part, irrespective of an abnormality in the other part. .Iaddend.