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Method and apparatus to control clutch stroke volume in an electro-mechanical transmission

  • US 8,062,174 B2
  • Filed: 10/13/2008
  • Issued: 11/22/2011
  • Est. Priority Date: 10/27/2007
  • Status: Active Grant
First Claim
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1. Method for controlling a powertrain comprising an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine adapted to selectively transmit mechanical power to an output member via selective application of a plurality of hydraulically actuated torque transfer clutches, said method comprising:

  • filling one of said hydraulic clutches to a reference fill volume expected to create a touching state in said clutch, wherein said filling is accomplished through control of a pressure control solenoid;

    monitoring an actual fill time of said hydraulic clutch;

    monitoring a flow utilized in said filling;

    determining a measured fill volume based upon said actual fill time and said flow;

    calculating a fill volume error based upon said measured fill volume and said reference fill volume;

    adjusting said reference fill volume based upon said fill volume error; and

    utilizing said adjusted reference fill volume in subsequent operation of said clutch.

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