Method and device for controlling an internal combustion engine

Abstract

The invention relates to a method for stopping an internal combustion engine, wherein an amount of air which is supplied via an air metering device of the internal combustion engine, in particular a throttle flap ( 100 ), is reduced after a stopping order has been detected. According to the invention, the amount of air which is supplied via the air metering device of the internal combustion engine is again increased when the detected speed (n) of the internal combustion engine falls below a predefinable speed threshold value (ns), wherein an intake cylinder (ZYL 2 ) to which the amount of air is supplied does not enter any working cycle after the amount of supplied air has been increased.

1 . A method for stopping an internal combustion engine, in which a quantity of air supplied to the internal combustion engine via an air metering device is reduced after a stop request has been detected, characterized in that the quantity of air supplied to the internal combustion engine via the air metering device is increased again if a detected speed (n) of the internal combustion engine falls below a specifiable speed threshold value (ns), wherein an inlet cylinder (ZYL 2 ), to which the quantity of air is supplied, no longer goes into a power stroke after the quantity of air supplied is increased. 
     
     
         2 . The method as claimed in  claim 2 , characterized in that the speed threshold value (ns) is reduced if the inlet cylinder (ZYL 2 ) goes into the power stroke after the quantity of air metered in is increased and before the internal combustion engine comes to a halt. 
     
     
         3 . The method as claimed in  claim 1 , characterized in that the speed threshold value is increased if the inlet cylinder (ZYL 2 ) no longer goes into a compression stroke after the quantity of air metered in is increased. 
     
     
         4 . The method as claimed in  claim 1 , characterized in that the specifiable speed threshold value is modified in accordance with a reverse oscillation angle (RPW). 
     
     
         5 . The method as claimed in  claim 4 , characterized in that the speed threshold value is increased if the reverse oscillation angle (RPW) is greater than a specifiable minimum reverse oscillation angle (RPWS). 
     
     
         6 . The method as claimed in  claim 5 , characterized in that the specifiable speed threshold value (ns) is increased to a specifiable initial threshold value (nsi). 
     
     
         7 . The method as claimed in  claim 7 , characterized in that the selected magnitude of the initial threshold value (nsi) is such that the inlet cylinder (ZYL 2 ) passes through the top dead center position. 
     
     
         8 . The method as claimed in  claim 1 , characterized in that the quantity of air metered in by the air metering device is increased immediately after the closure of an outlet valve ( 160 ) of the inlet cylinder (ZYL 2 ). 
     
     
         9 . The method as claimed in  claim 1 , characterized in that fuel is injected in such a way that an ignitable fuel/air mixture is present in the inlet cylinder (ZYL 2 ) when it leaves the inlet stroke. 
     
     
         10 . The method as claimed in  claim 1 , characterized in that fuel is injected before the inlet cylinder (ZYL 2 ) goes into the inlet stroke. 
     
     
         11 . A computer program, characterized in that it is programmed for use in a method as claimed in  claim 1 . 
     
     
         12 . An electric storage medium for an open-loop and closed-loop control device for an internal combustion engine, characterized in that a computer program for use in a method as claimed in  claim 1  is stored on said medium. 
     
     
         13 . An open-loop and closed-loop control device for an internal combustion engine, characterized in that it is programmed for use in a method as claimed in  claim 1 . 
     
     
         14 . The method as claimed in  claim 1 , wherein the air metering device is a throttle valve ( 100 ). 
     
     
         15 . The method as claimed in  claim 1 , characterized in that fuel is injected immediately after the inlet cylinder (ZYL 2 ) goes into the inlet stroke. 
     
     
         16 . An electric storage medium for an open-loop control device for an internal combustion engine, characterized in that a computer program for use in a method as claimed in  claim 1  is stored on said medium. 
     
     
         17 . An electric storage medium for a closed-loop control device for an internal combustion engine, characterized in that a computer program for use in a method as claimed in  claim 1  is stored on said medium. 
     
     
         18 . An open-loop control device for an internal combustion engine, characterized in that it is programmed for use in a method as claimed in  claim 1 . 
     
     
         19 . A closed-loop control device for an internal combustion engine, characterized in that it is programmed for use in a method as claimed in  claim 1 .