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Engine on idle arbitration for a hybrid electric vehicle

  • US 6,664,651 B1
  • Filed: 11/14/2000
  • Issued: 12/16/2003
  • Est. Priority Date: 11/14/2000
  • Status: Expired due to Term
First Claim
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1. A method for controlling idle speed of an engine in a hybrid electric vehicle, the vehicle including a battery, a generator operatively coupled to the engine, an engine controller, and a vehicle system controller, the method comprising:

  • determining whether a set of vehicle idle entry conditions are met, the idle entry conditions being met when the vehicle speed is below a predetermined value and an accelerator pedal is below a predetermined minimum pedal position;

    selectively activating the vehicle system controller to control the generator to control engine idle speed when any one of a predetermined first set of operating conditions is present;

    selectively activating the engine controller to control engine idle speed when a predetermined second set of operating conditions is present; and

    turning off the engine when both the predetermined first set of conditions is not present and the engine has been in a current vehicle idle mode for a predetermined amount of time.

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