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Malfunction diagnosing apparatus for electronic control system for vehicles

  • US 4,246,566 A
  • Filed: 04/17/1979
  • Issued: 01/20/1981
  • Est. Priority Date: 05/09/1978
  • Status: Expired due to Term
First Claim
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1. In combination with an electronic control system for vehicles, said electric control system having a battery, a sensor energized by said battery for converting a sensed vehicle condition into an electric condition voltage, an actuator having a winding energizable by said battery for controlling a vehicle operation, and an electronic calculation unit connected between said sensor and said actuator, for producing a pulse signal which enables said winding to be energized in response to said electric condition voltage, a malfunction diagnosing apparatus comprising:

  • first connecting means detachably connected to said sensor for deriving a voltage supplied to energize said sensor;

    first comparing means for comparing said voltage derived by said first connecting means with a first reference value indicative to an allowable minimum energizing voltage;

    first memorizing means for memorizing a malfunction in response to a first output of said first comparing means, said first output being indicative of said voltage derived by said first connecting means being smaller than said first reference value;

    first displaying means for displaying said malfunction memorized by said first memorizing means;

    second connecting means detachably connected to said actuator for deriving a voltage proportional to a current flowing through said winding when said pulse signal is produced by said electronic calculation unit;

    second comparing means for comparing said voltage derived by said second connecting means with a second reference value indicative of a required minimum energizing current;

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