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Method for stabilization of optimal input speed in mode for a hybrid powertrain system

  • US 8,406,970 B2
  • Filed: 09/20/2008
  • Issued: 03/26/2013
  • Est. Priority Date: 11/03/2007
  • Status: Expired due to Fees
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;

    applying a biasing cost to increase the value of at least one of said first and second power loss based on said operational parameter only when at least one ofsaid operational parameter is positive and said second transmission input speed is less than said first transmission input speed, andsaid operational parameter is negative and said second transmission input speed is greater than said first transmission input speed;

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

    determining a third transmission input speed based on the comparison of said first power loss to said second power loss subsequent to said biasing; and

    operating said transmission using said third transmission input speed.

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