AIR-FUEL RATIO STUDY METHOD FOR INTERNAL COMBUSTION ENGINE

摘要

PURPOSE: To prevent fuel consumption from worsening by determining a correction amount of a fuel injection amount in a learn burn region from a fuel injection correction amount at feedback control time, calculating a difference between this correction amount and a target correction amount of fuel injection amount, and studying the correction amount of fuel injection amount in the lean burn region based on this difference ;CONSTITUTION: An ECU6 for controlling a fuel injection valve 5 of an engine 100 calculates a correction coefficient FLA for determining a fuel amount corrected for obtaining target air-fuel ratio in the case of control in a lean burn region by the target air-fuel ratio in a step 51. In a step 52, a difference FLAFDI from a target correction coefficient FLAFT, in the case of calculating the correction coefficient FLAF and a fuel injection amount in theoretical air- fuel ratio, is calculated. By a value of this difference FLAFDI, a study is performed in steps 53 to 54 and steps 61 to 62, and as a result by obtained study value KQi, a fuel injection amount in the lean burn region is controlled in detail. In this way, fuel consumption is prevented from worsening, to improve efficiency of an output.;COPYRIGHT: (C)1994,JPO&Japio