ENGINE CONTROLLER

摘要

An engine controller comprising a main injection valve arranged to inject a fuel into an intake port in an intake passage or a combustion chamber, a subinjection valve arranged to inject the fuel into the upstream section of the intake port in the intake passage or a passage bypassing the main injection valve, an air-fuel ratio detecting means provided in an exhaust passage, and a means for controlling the fuel injection of the main injection valve or the subinjection valve. The control means controls the subinjection valve to perform fuel injection temporarily when the main injection valve is injection fuel, judges the properties of the working fuel based on the response of air-fuel ratio detected by the air-fuel ratio detecting means at that time and then alters control parameters such as fuel injection amounts and ignition timing, depending on thus-judged the properties of the fuel.