Fault detection and diagnostic system for automotive battery charging systems

  • US 4,379,990 A
  • Filed: 05/22/1980
  • Issued: 04/12/1983
  • Est. Priority Date: 05/22/1980
  • Status: Expired due to Term
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First Claim
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1. An in situ self-diagnostic automotive alternator-battery charging system comprising:

  • a battery;

    voltage regulator means sensing battery voltage and generating an excitation signal in response thereto;

    alternator means coupled to said battery and said voltage regulator means, driven by a vehicle engine, providing a rectified electrical signal for charging said battery in response to said excitation signal;

    a plurality of electronic circuit status detectors, each of said plurality maintaining a first logic state when a corresponding electrical signal characteristic is within a predetermined range and a second logic state when said electrical signal characteristic is outside said predetermined range, selected ones of said plurality being coupled to said battery, voltage regulator means and said alternator means with at least one of said electronic circuit status detectors including resettable timing means establishing time intervals for the detection of repetitive occurrences of pulse signals; and

    logic means coupled to said plurality of circuit status detectors and responsive to the logic output states of said circuit status detectors, identifying predetermined sequences of logic states thereby to identify the occurrence of faults in said charging system.

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