Patent ID: 6116227
Filing Date: 2000-09-12
Classification: F02D

Abstract:
An engine air-fuel ratio controller, comprising:a fuel injector for injecting fuel for providing an air-fuel mixture to an engine,a first sensor for detecting an engine load,a second sensor for detecting an engine rotation speed, anda microprocessor programmed to:calculate a basic injection amount based on said engine load and said engine rotation speed,pre-store a learning value of a multiplication term for correcting said basic injection amount by multiplying said learning value of said multiplication term and said basic injection amount,pre-store a learning value of an addition term for correcting said basic injection amount by adding said learning value of said addition term to said basic injection amount,convert said learning value of said addition term to a proportion relative to said basic injection amount,modify said learning values so that the sum of said proportion and said learning value of said multiplication term is within a predetermined range,calculate a target fuel injection amount from said basic injection amount and said modified learning values, andcontrol said fuel injector so that an injection amount of said fuel injector coincides with said target injection amount.