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Regenerative vehicle launch

  • US 5,637,987 A
  • Filed: 12/18/1995
  • Issued: 06/10/1997
  • Est. Priority Date: 12/18/1995
  • Status: Expired due to Term
First Claim
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1. A method of launching a vehicle from a substantially static condition, said vehicle having a drivetrain comprising an internal combustion engine including an engine output member, a electric machine including a stator and rotor, and a gear set operatively coupling said internal combustion engine output, said rotor and a gear set output member of said gear set, said gear set output member being operatively coupled to at least one drive wheel for propelling the vehicle, wherein said generator is effective as an electric brake reaction element to control torque transfer between said engine output member and said gear set output member, the method comprising:

  • detecting a predetermined set of vehicle drivetrain operating parameters;

    controlling a torque influencing electric machine parameter to apply an amount of generator torque to the rotor as a function of said predetermined set of vehicle operating parameters thereby converging respective speeds of the rotor and the gear set output member; and

    ,when the speeds of the rotor and the gear set output member attain a predetermined speed differential relationship, controlling the rotor speed to the gear set output member speed.

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