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Electrical load abnormality-detecting system for automotive vehicles

  • US 5,857,325 A
  • Filed: 08/26/1996
  • Issued: 01/12/1999
  • Est. Priority Date: 08/25/1995
  • Status: Expired due to Fees
First Claim
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1. An electrical load abnormality-detecting system for an automotive vehicle, comprising:

  • a plurality of electrical load devices installed on said automotive vehicle;

    a current sensor provided commonly for said plurality of electrical load devices, for detecting a total load current flowing through said plurality of electrical load devices; and

    abnormality-detecting means for separately putting said plurality of electrical load devices into operation, and for determining abnormality of each of said plurality of electrical load devices based on said total load current detected by said current sensor,wherein said abnormality-detecting means comprises determining means for determining that said plurality of electrical load devices are each operating normally if said total load current detected by said current sensor falls within a range defined by a predetermined upper limit value and a predetermined lower limit value when said plurality of electrical load devices are all put into operation,wherein said abnormality-detecting means further comprises means for putting one of said plurality of electrical load devices into operation and stopping remaining at least one of said plurality of electrical load devices other than said one of said plurality of electrical load devices from operating when said total load current detected by said current sensor falls outside said range defined by said predetermined upper limit value and said predetermined lower limit value of said total load current, means for subtracting a predetermined value of current corresponding to said remaining at least one of said plurality of electrical load devices from said total load current detected by said current sensor to calculate a modified total load current, comparison means for comparing said modified total load current with a predetermined upper limit value and a predetermined lower limit value of said modified total load current corresponding to said one of said plurality of electrical load devices put into operation, and second determining means for determining that said one of said plurality of electrical load devices put into operation is operating normally if said modified total load current falls within a range defined by said predetermined upper limit value and said predetermined lower limit value of said modified total load current corresponding to said one of said plurality of electrical load devices put into operation.

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