Patent ID: 7168422
Filing Date: 2007-01-30
Classification: F02D,F02N

Abstract:
1. A control apparatus for an internal combustion engine comprising: a variety of kinds of sensors that detect an operating condition of said internal combustion engine having a combustion chamber, an intake system and an exhaust system; an injector that injects fuel into said intake system or said combustion chamber of said internal combustion engine; an injector driving section that drives said injector in accordance with said engine operating condition; an air fuel ratio feedback correction value calculation section that calculates an air fuel ratio feedback correction value for said injector driving section; an air fuel ratio learning section that stores an integrated value of said air fuel ratio feedback correction value after updating said integrated value as an air fuel ratio learning correction value; and an air fuel ratio detecting section that detects an air fuel ratio of an exhaust gas in said exhaust system of said internal combustion engine based on detection signals of said various kinds of sensors; wherein said air fuel ratio feedback correction value calculation section calculates a target air fuel ratio based on said engine operating condition, and calculates said air fuel ratio feedback correction value so as to bring said air fuel ratio detected by said air fuel ratio detecting section close to said target air fuel ratio; said air fuel ratio feedback correction value calculation section including: a temperature detecting section that detects a temperature parameter of said internal combustion engine based on the detection signals of said various kinds of sensors; and an air fuel ratio learning correction value changing section that updates said air fuel ratio learning correction value in accordance with said engine operating condition; wherein when said internal combustion engine is stopped with said temperature parameter having not yet reached a predetermined value after started from a cold state thereof, said air fuel ratio learning correction value changing section sets an amount of update of said air fuel ratio learning correction value at a lean side of the air fuel ratio of said internal combustion engine in such a manner that the lower said temperature parameter immediately before the starting of said internal combustion engine, the smaller does said amount of update become.