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Energy control strategy for a hybrid electric vehicle

  • US 6,449,537 B1
  • Filed: 10/27/2000
  • Issued: 09/10/2002
  • Est. Priority Date: 10/27/2000
  • Status: Expired due to Term
First Claim
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1. An energy control strategy for a vehicle system controller for a parallel hybrid electric vehicle having an engine, a motor and a battery having bleed and charge states of operation, said energy control strategy having a measured motor speed, an engine idle speed and a battery state of charge as inputs, said control strategy comprising the steps of:

  • establishing a value that is representative of a power level at which the battery is to be charged, said value called CHARGE_CMD for the Charge state and further comprising;

    determining a minimum of a predetermined constant power level and a variable power level having a predetermined upper boundary and a predetermined lower boundary for the charge state;

    wherein when the battery state of charge is equal to said predetermined upper boundary, said variable power level is equal to said predetermined constant power level;

    wherein when the battery state of charge is equal to said predetermined lower boundary, said variable power level is zero; and

    wherein when the battery state of charge is between said predetermined upper boundary and said predetermined lower boundary, said variable power level is given by a fraction of said predetermined constant power level;

    calculating a torque to be commanded to the motor based on said value, said torque to be commanded called TQ_SA_BC; and

    sending said torque to be commanded to the motor.

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