PURPOSE: To properly detect a condition change without using a particular sensor by grasping an influence according to fluctuating an external main cause of a vehicle as the condition change detected via a torque converter, and deciding a simulatively detected operating condition of the vehicle to be a true condition.
CONSTITUTION: In a vehicle, an output of an engine 1 is transmitted to a drive shaft 3 or the like through a transmission 2 provided with a torque converter 14 or the like. Then in an engine control part 8, based on an operating condition of the engine 1, a misfire is decided in a misfire detecting decision part 8c, and on the other hand, in accordance with each calculating result of a fuel injection calculating part 8a and an ignition timing calculating part 8b, an injector 13 and a transmission control part 7 are controlled. Here in the misfire detecting decision part 8c, an operating condition of the vehicle is artificially detected. An influence according to fluctuating an external main cause of the vehicle is grasped as a condition change detected via the torque converter 14. Further in accordance with a detecting result of the external main cause, the artificially detected operating condition of the vehicle is decided to be a true condition.
NEMOTO MAMORU
KASHIMURA YUICHI
ISHII TOSHIO
HITACHI AUTOMOTIVE ENG