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METHOD AND SYSTEM FOR DETERMINING ENGINE STATE OF A HYBRID ELECTRIC VEHICLE

  • US 20050230977A1
  • Filed: 04/19/2004
  • Published: 10/20/2005
  • Est. Priority Date: 04/19/2004
  • Status: Active Grant
First Claim
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1. A method for controlling on/off states of an engine in a hybrid electric vehicle powertrain, the method comprising the steps of:

  • generating a plurality of request state variables based on a comparison of vehicle operating conditions and requirements, each variable indicating an active or inactive status of a plurality of engine requests;

    combining at least two request state variables to form a combined request state variable that contains active requests in the at least two request state variables;

    simplifying the combined request state variable to eliminate any redundant requests and to resolve any conflicting requests;

    providing a final request state variable; and

    evaluating the final request state variable to determine whether a change in engine state is desirable.

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