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Starter/alternator control strategy to enhance driveability of a low storage requirement hybrid electric vehicle

  • US 6,394,208 B1
  • Filed: 03/30/2000
  • Issued: 05/28/2002
  • Est. Priority Date: 03/30/2000
  • Status: Expired due to Term
First Claim
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1. A hybrid electric vehicle comprising:

  • a powerplant for propelling the vehicle comprising a combustion engine and a dynamoelectric machine that is arranged for interaction with the combustion engine so as to function, with respect to the engine, at times as a power source for adding torque into a drivetrain through which the powerplant propels the vehicle, and at times as a power sink for subtracting torque from the drivetrain;

    a control system comprising a vehicle controller that receives driver input and issues respective outputs to an engine controller for controlling the engine and to a dynamoelectric machine controller for controlling the dynamoelectric machine, respectively;

    a signal source on the engine providing engine speed data to said dynamoelectric machine controller;

    the dynamoelectric machine controller comprising a look-up table that contains respective make-up torque values correlated with respective values of engine speed data to smooth out vehicle acceleration and provide better drivability during certain driving condition; and

    the dynamoelectric machine controller comprising a processor that causes a make-up torque value from the look-up table corresponding to a value of engine speed data received from the signal source, to be included in the torque output of the dynamoelectric machine for interaction with the engine.

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