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System and method of maintaining high voltage battery charging with detected auxiliary battery fault

  • US 10,112,487 B1
  • Filed: 04/18/2017
  • Issued: 10/30/2018
  • Est. Priority Date: 04/18/2017
  • Status: Active Grant
First Claim
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1. An electric vehicle (EV) auxiliary battery current fault system, comprising:

  • a battery maintenance electronic control unit (ECU);

    an auxiliary battery sensor communicatively coupled to an auxiliary battery and the battery maintenance ECU;

    a voltage sensor communicatively coupled to a main battery and the battery maintenance ECU;

    a battery isolation switch;

    a low voltage bus communicatively coupled to at least one of the main battery, the auxiliary battery, the battery isolation switch, and a DC to DC converter; and

    an auxiliary battery sensor and controller communicatively coupled to the auxiliary battery and the battery maintenance ECU.

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