Method and apparatus for measuring a parameter of a vehicle electrical system

  • US 7,154,276 B2
  • Filed: 09/05/2003
  • Issued: 12/26/2006
  • Est. Priority Date: 09/05/2003
  • Status: Active Grant
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First Claim
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1. A method for determining cable resistance of wiring of an electrical system of a vehicle which includes a battery, a load, and a first cable connecting a first side of the battery to a first side of the load, and a second cable connecting a second side of the battery to a second side of the load, comprising:

  • coupling a first Kelvin connector to the first side of the load of the vehicle, the first Kelvin connector having a first connector and a second connector;

    coupling a second Kelvin connector to the second side of the load of the vehicle, the second Kelvin connector having a third connector and a fourth connector;

    coupling a first voltage sensor connector to the first side of the battery of the vehicle;

    coupling a second voltage sensor connector to the second side of the battery of the vehicle;

    applying a forcing function between the first connector of the first Kelvin connector and the third connector of the second Kelvin connector;

    measuring a first parameter of the electrical system between the second connector of the first Kelvin connector and the second voltage sensor connector in response to the applied forcing function;

    measuring a second parameter of the electrical system between the first voltage sensor connector and the second voltage sensor connector in response to the applied forcing function;

    measuring a third parameter of the electrical system between the fourth connector of the second Kelvin connector and the second voltage sensor connector in response to the applied forcing function;

    measuring a fourth parameter of the electrical system between the first voltage sensor connector and the second voltage sensor connector in response to the applied forcing function;

    determining the cable resistance of the first cable as a function of the first parameter and the second parameter; and

    determining the cable resistance of the second cable as a function of the third parameter and the fourth parameter.

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