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Method for controlling engine speed in a hybrid electric vehicle

  • US 20080236921A1
  • Filed: 03/29/2007
  • Published: 10/02/2008
  • Est. Priority Date: 03/29/2007
  • Status: Active Grant
First Claim
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1. Method for controlling operation of a hybrid powertrain, the hybrid powertrain comprising an internal combustion engine, an energy storage system, an electric machine, and an electro-mechanical transmission, the energy storage system and electric machine electrically-operatively coupled for power flow therebetween;

  • and, the engine, electric machine, and the electro-mechanical transmission mechanically-operatively coupled to transmit power therebetween to generate a power flow to an output, the method comprising;

    determining optimum engine operation and an engine capability, and an operator torque request;

    monitoring states of parameters of the electrical energy storage device;

    determining a limit to the engine capability based upon the optimum engine operation, the engine capability, and the states of the parameters of the electrical energy storage device;

    determining power limits of the energy storage device based upon the states of the parameters of the energy storage device;

    adjusting the limit to the engine capability based upon the power limits of the energy storage device; and

    ,controlling engine operation based upon the engine capability and the adjusted limit to the engine capability.

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