Patent ID: 6019093
Filing Date: 2000-02-01
Classification: F02D

Abstract:
In an air-fuel ratio control system for an internal combustion engine having an exhaust system, including air-fuel ratio-detecting means arranged in said exhaust system, for detecting an air-fuel ratio of exhaust gases from said engine, and feedback control means for calculating an adaptive control amount, based on an output from said air-fuel ratio-detecting means, by using an adaptive controller having adaptive parameter-adjusting means for adjusting adaptive parameters, such that an air-fuel ratio of a mixture supplied to said engine is converged to a desired air-fuel ratio, and for controlling said air-fuel ratio of said mixture supplied to said engine in a feedback manner, according to said adaptive control amount,the improvement comprising:particular operating condition-detecting means for detecting a particular engine operating condition in which said adaptive controller can become unstable in operation; andinitializing means operable upon detection of said particular engine operating condition, for initializing said adaptive parameters according to said adaptive control amount.