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Engine control system

  • US 20030100975A1
  • Filed: 04/23/2002
  • Published: 05/29/2003
  • Est. Priority Date: 11/28/2001
  • Status: Active Grant
First Claim
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1. An engine control system comprised of:

  • 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; and

    engine speed or vehicle speed detecting means; and

    includes a microprocessor (CPU);

    said engine control system 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 that 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

    said evacuation operation mode selection means is means for selecting 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.

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