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Sensor malfunction detecting system in vehicle control system

  • US 5,671,981 A
  • Filed: 04/17/1996
  • Issued: 09/30/1997
  • Est. Priority Date: 04/20/1995
  • Status: Expired due to Term
First Claim
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1. A sensor malfunction detecting system in a control system for a vehicle using output values from first and second sensors of different types as control information, comprising:

  • calculating means for repeatedly calculating a difference between an acceleration value based on an output from said first sensor and a value based on an output from said second sensor;

    determining means for repeatedly determining whether said difference calculated by said calculating means is within a prescribed range that is calculated based on at least one of an initial variation error of one of said sensors a temperature drift of one of said sensors a degradation of one of said sensors, and a calculation accuracy of said calculating means;

    counting means for storing a count value and selectively updating said count value in accordance with a result of said determining by said determining means, in which said count value is updated every time it is determined by said determining means that said difference is out of said prescribed range; and

    malfunction determining means for determining that one of said sensors is malfunctioning when said count value updated by said counting means reaches a prescribed target value;

    wherein said determining means and said counting means are respectively implemented by arithmetic operations in a processor.

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