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Method for developing a trip cost structure to understand input speed trip for a hybrid powertrain system

  • US 8,374,758 B2
  • Filed: 09/24/2008
  • Issued: 02/12/2013
  • Est. Priority Date: 11/04/2007
  • Status: Expired due to Fees
First Claim
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1. Method for controlling a powertrain system including an engine mechanically 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, wherein a control module performs the following steps comprising:

  • determining a current transmission operating range state and engine state;

    determining a potential transmission operating range state and engine state;

    determining a preferability factor corresponding to the current transmission operating range state and engine state and determining a preferability factor corresponding to a potential transmission operating range state and engine state, wherein said preferability factors are determined based upon power losses in the powertrain system;

    combining said preferability factor corresponding to the potential transmission operating range state with a preferability factor corresponding to an input speed path associated with a change between the current transmission operating range state and the potential transmission operating range state;

    preferentially weighting the preferability factor for the current transmission operating range state and engine state; and

    commanding changing between the current transmission operating range state and engine state and the potential transmission operating range state and engine state based upon said preferability factors.

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