AIR-FUEL RATIO CONTROLLER FOR INTERNAL COMBUSTION ENGINE

摘要

PURPOSE:To provide a desired output air-fuel ratio even in travelling on a highland by correcting an air density correction factor according to actual intake air flow and intake air flow calculated based on rotational frequency of an engine and the opening of a throttle valve under the predetermined running condition. CONSTITUTION:A F/B control region detecting means B is provided which compares the rotational frequency of an engine and a basic fuel supply set by a setting means A respectively with set values to generate an air fuel ratio feed-back (F/B) control command. Also, an intake air flow calculating means C is provided which calculates an intake air amount on the basis of the rotational frequency of engine and the opening of a throttle valve. And a memory means D is provided which stores a air density correction factor correcting F/B control region according to the air density. Under a predetermined running requirements is corrected said factor by a correction means E on the basis of actual intake air flow and calculated intake air flow and said set values for comparing a basic fuel supply are corrected by a correction means F on the basis of the corrected correction factor.