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Hybrid Electric Vehicle Powertrain with Engine Start and Transmission Shift Arbitration

  • US 20080119975A1
  • Filed: 11/16/2006
  • Published: 05/22/2008
  • Est. Priority Date: 11/16/2006
  • Status: Active Grant
First Claim
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1. A method for controlling a hybrid electric vehicle powertrain having an engine, at least one motor-generator, a multiple-ratio transmission defining parallel power flow paths to vehicle traction wheels and a controller for effecting a transition from motor-generator drive operation to engine drive operation, the method comprising the steps of:

  • determining whether the powertrain is operating in motor-generator drive operation with the engine off;

    determining whether a desired power is less than a calibrated engine-on power threshold value;

    calculating a predicted time to start the engine in advance of a transmission ratio shift;

    calculating a predicted time to shift the transmission from one ratio to another ratio;

    comparing the predicted time to shift the transmission to the predicted time to start the engine; and

    starting the engine if the predicted time to shift the transmission is greater than the predicted time to start the engine, whereby a smooth transition from motor-generator drive operation to engine drive operation is achieved.

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