Patent ID: 6799110
Filing Date: 2004-09-28
Classification: F02D,Y10T

Abstract:
An engine control system comprising:motor drive control means that is power fed via a power supply switch from a vehicle-mounted battery and controls an open/close driving motor of a throttle valve for an intake of the engine in response to an output from an accelerator position sensor for detecting a degree of a depression of an accelerator pedal and an output from a throttle position sensor for detecting a throttle valve opening; fuel injection control means for the engine; engine speed or vehicle speed detecting means; and a microprocessor (CPU); wherein said engine control system further comprising multi-stage abnormality detecting means, multi-stage evacuation operation means, and evacuation operation mode selection means; wherein said abnormality detecting means is multi-stage abnormality detecting means bat regularly monitors operations of sensor system, control system and actuator system relating to a throttle valve control, and identifies and detects slight abnormality and serious abnormality depending on whether or not at least control of said actuator is possible; said evacuation operation means is multi-stage evacuation operation means that responds to any abnormality result detected by said multi-stage abnormality detecting means, and comprises at least slight abnormality evacuation operation means and serious abnormality evacuation operation means; and wherein said evacuation operation mode selection means selects one of said multi-stage evacuation operation means so that shift from a normal operation when said slight abnormality or serious abnormality is not generated, to a side of getting worse in abnormality degree toward the slight abnormality evacuation operation or the serious abnormality evacuation operation may be possible, while shift to a return side in the abnormality degree may be impossible without interrupting said power supply switch.