Control system of internal combustion engine

Abstract

A control system of an internal combustion engine includes: a pressure detecting mechanism detecting a pressure in a gas passage which is communicated with the engine; and a controller acquiring a reference pressure as the pressure which is detected immediately after the controller is actuated, and controlling an actuator of the engine based on the reference pressure. The controller is inhibited from acquiring the reference pressure as the detected pressure when the controller is re-actuated after the controller is reset due to a factor other than a turned-off operation of an ignition switch.

1 . A control system of an internal combustion engine, comprising:
 a throttle valve that is provided in an intake passage of the internal combustion engine;   an emission control catalyst that is provided in an exhaust gas passage of the internal combustion engine;   a secondary supply device including:   a secondary air supply passage that communicates with the intake passage downstream the throttle valve and the exhaust gas passage upstream the emission control catalyst:   air pumping means for pumping the secondary air into the secondary air passage;   switching means for selectively opening and closing the secondary air passage;   pressure detecting means for detecting a pressure in the secondary air passage and that is provided upstream of the switching means; and   control means for acquiring a reference pressure as the pressure which is detected immediately after the control means is actuated, and controlling an actuator of the internal combustion engine based on the reference pressure,   wherein the control means is inhibited from acquiring the detected pressure when the control means is re-actuated after the control means is reset due to a factor other than turned-off operation of an ignition switch.   
   
   
       2 . The control system of the internal combustion engine according to  claim 1 , wherein the control means is inhibited from acquiring the reference pressure as the detected pressure when the control means is re-actuated after the control means is reset due to a sharp voltage-drop of a power supply during operation of the internal combustion engine. 
   
   
       3 . The control system of the internal combustion engine according to  claim 1 , wherein it is determined that the control means was reset due to the turned-off operation of the ignition switch when the control means has been kept de-actuated over a predetermined period of time and an internal combustion engine speed has been zero. 
   
   
       4 . The control system of the internal combustion engine according to  claim 3 , wherein the predetermined period of time is 500 milliseconds. 
   
   
       5 . The control system of the internal combustion engine according to  claim 3 , wherein the control means acquires the reference pressure after a predetermined delay time elapses from the initiation of the actuation of the control means when it is determined that the control means was reset due to the turned-off operation of the ignition switch. 
   
   
       6 . The control system of the internal combustion engine according to  claim 5 , wherein the predetermined delay time is 20 milliseconds. 
   
   
       7 . The control system of the internal combustion engine according to  claim 1 , wherein:
 the control means determines whether an abnormality of at least one of the air pumping means and he switching means occurs, based on the reference pressure and the pressure detected by the pressure detecting means during operation of the internal combustion engine.   
   
   
       8 . The control system of the internal combustion engine according to  claim 1 , wherein:
 the control means controls a fuel injection amount to the internal combustion engine, based on the reference pressure, the pressure detected by the pressure detecting means during operation of the internal combustion engine, and an internal combustion engine speed.   
   
   
       9 . The control system of the internal combustion engine according to  claim 1 , wherein the reference pressure is atmospheric pressure.