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Control system for, in the presence of a varying system load, establishing generator current to maintain a particular battery charge state

  • US 6,091,228 A
  • Filed: 10/22/1998
  • Issued: 07/18/2000
  • Est. Priority Date: 04/29/1998
  • Status: Expired due to Term
First Claim
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1. A method for controlling the state of charge of a battery of a hybrid electric vehicle around a set state of charge which is less than full charge, by controlling an electrical power generator, said method comprising the steps of:

  • estimating the state of charge of said battery to generate signals representative of the existing state of charge of said battery;

    generating signals representative of the desired state of charge of said battery;

    taking the difference between said signals representative of the existing (present) state of charge and said signals representative of the desired state of charge to generate state-of-charge error signals;

    processing said state-of-charge error signals by at least integrating, to produce desired generator current signals;

    sensing the generator current to produce existing generator current signals;

    taking the difference between said existing generator current signals and said desired generator current signals to produce generator-current error signals;

    processing said generator-current error signals by at least integration to produce a generator output current command; and

    controlling the electrical current output of said generator in response to said generator output current command.

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