Patent ID: 6568175
Filing Date: 2003-05-27
Classification: F02D,F02P,Y02T

Abstract:
A control system for an internal combustion engine having an intake system and an exhaust system, said exhaust system including a catalyst, said intake system including a throttle valve, said engine being mounted on a vehicle having a brake booster to which an intake pressure at downstream of said throttle valve is introduced, said control system comprising:intake air amount control means for controlling an intake air amount of said engine; ignition timing control means for controlling an ignition timing of said engine; catalyst temperature raising means for increasing the intake air amount after starting of said engine and retarding the ignition timing according to a rotational speed of said engine; intake pressure detecting means for detecting the intake pressure at downstream of said throttle valve; and catalyst temperature rise control suppressing means for gradually suppressing the operation of said catalyst temperature raising means when a pressure difference between the detected intake pressure and the atmospheric pressure during the operation of said catalyst temperature raising means is less than a predetermined pressure.