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Control of engine torque during upshift and downshift torque phase for a hybrid powertrain system

  • US 9,008,926 B2
  • Filed: 10/16/2008
  • Issued: 04/14/2015
  • Est. Priority Date: 11/04/2007
  • Status: Expired due to Fees
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 through selective application of a plurality of clutches, said method comprising:

  • commanding a shift from a fixed gear operating range state to a second operating range state, said second operating range state achieved without activating an oncoming clutch;

    commanding decreased reactive torque through an off-going clutch during a torque phase of said commanded shift; and

    operating a control module to decrease said reactive torque through said off-going clutch through control of engine input torque, comprising monitoring a requested output torque,monitoring factors describing input torque constraints required to offload said off-going clutch without causing clutch slip,estimating a predicted engine torque request based upon said requested output torque through said commanded shift,determining minimum and maximum engine torques based upon said monitoring factors, andwhen said predicted engine torque request exceeds said maximum engine torque, imposing an immediate engine torque request upon said engine to offload said off-going clutch without causing clutch slip.

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