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METHOD FOR STABILIZATION OF OPTIMAL INPUT SPEED IN MODE FOR A HYBRID POWERTRAIN SYSTEM

  • US 20090118918A1
  • Filed: 09/20/2008
  • Published: 05/07/2009
  • Est. Priority Date: 11/03/2007
  • Status: Active Grant
First Claim
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1. Method for improving drivability of a powertrain system having an accelerator control and including an engine coupled to an electro-mechanical transmission selectively operative in one of a plurality of transmission operating range states and one of a plurality of engine states, comprising:

  • determining a first transmission input speed, said first transmission input speed having an associated first power loss;

    operating said transmission using said first transmission input speed;

    determining an operational parameter relating to said accelerator control;

    determining a second transmission input speed responsive to said operational parameter, said second transmission input speed having an associated second power loss;

    biasing the value of at least one of said first and second power loss based on said operational parameter;

    comparing said first power loss to said second power loss subsequent to said biasing;

    determining a third transmission input speed; and

    operating said transmission using said third transmission input speed.

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