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Method and system for charging an auxilary battery in a plug-in electric vehicle

  • US 8,482,255 B2
  • Filed: 08/26/2010
  • Issued: 07/09/2013
  • Est. Priority Date: 08/26/2010
  • Status: Active Grant
First Claim
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1. A method of charging an auxiliary battery in a plug-in electric vehicle including an onboard charging system, the method comprising:

  • charging the auxiliary battery to an upper charge level using an external power source thereby reducing energy used from the onboard charging system to charge the auxiliary battery during a drive mode of the vehicle, the upper charge level being at least one of;

    approximately an upper level of a predetermined operating range of charge levels; and

    greater than the predetermined operating range of charge levels;

    allowing the auxiliary battery to discharge to a lower charge level during the drive mode of the vehicle, the lower charge level being at least one of;

    approximately a lower level of the predetermined operating range of charge levels; and

    less than the predetermined operating range of charge levels;

    wherein the lower charge level is based on a time that the vehicle is predicted to be in an off state.

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