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METHOD AND APPARATUS TO CONTROL ENGINE TORQUE TO PEAK MAIN PRESSURE FOR A HYBRID POWERTRAIN SYSTEM

  • US 20090118083A1
  • Filed: 10/13/2008
  • Published: 05/07/2009
  • Est. Priority Date: 11/04/2007
  • Status: Active Grant
First Claim
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1. Method for controlling a powertrain comprising an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine adapted to selectively transmit mechanical power to an output member, said method comprising:

  • monitoring a rotational speed of said engine;

    monitoring a temperature of a transmission fluid;

    determining a maximum hydraulic pressure within a hydraulic control system based upon said rotational speed of said engine and said temperature of said transmission fluid;

    determining a predicted clutch torque capacity based upon said maximum hydraulic pressure;

    generating a preferred input torque from said engine based upon said predicted clutch torque capacity; and

    utilizing said preferred input torque to control said engine.

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