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System and method for ground isolation detection in a vehicle

  • US 8,554,500 B2
  • Filed: 11/19/2010
  • Issued: 10/08/2013
  • Est. Priority Date: 06/11/2010
  • Status: Active Grant
First Claim
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1. A system for detecting a ground fault or degraded isolation between a bus terminal and ground or a chassis reference on a vehicle, the system comprising:

  • a first bus terminal isolated from ground and the chassis reference during normal operation of the vehicle;

    a second bus terminal isolated from ground and the chassis reference during normal operation of the vehicle;

    a first amplifier for receiving a first signal from the first bus terminal;

    a second amplifier for receiving a second signal from the second bus terminal;

    an inverter input of an inverter coupled to an output of the first amplifier;

    an analog-to-digital converter input of an analog-to-digital converter coupled to an inverter output of the inverter and an output of the second amplifier; and

    a data processor capable of receiving outputted digital data of the analog-to-digital converter, the data processor configured to apply a frequency domain transform to the digital data of the first bus terminal and the second bus terminal;

    the data processor identifying at least one of a circuit location of the ground fault or degraded isolation and a type of ground fault or degraded isolation based on the application of the frequency domain transform to the digital data.

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