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Method and device for controlling a creep operation of a vehicle with a hybrid drive

  • US 8,475,331 B2
  • Filed: 12/02/2008
  • Issued: 07/02/2013
  • Est. Priority Date: 12/17/2007
  • Status: Expired due to Fees
First Claim
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1. A method for controlling a creeping operation of a vehicle with a hybrid drive, with a parallel hybrid drive train, comprising an internal combustion engine, at least one electric motor, a first shifting component designed as a frictional component that is arranged between the combustion engine and the electric motor, a transmission, an output and a second shifting component designed as a frictional component that is arranged between the electric motor and the output, characterized in that to realize the creeping operation with running internal combustion engine, the two shifting components are simultaneously operated in slip operation, with an overall friction output that is required to produce a desired creeping moment is variably distributed to the two shifting components, wherein the distribution of the overall friction output to the two shifting components is performed using a rotational speed control of the electric motor, by means of which the power dissipating moment of the shifting components, which are correlated with the individual frictional moments, are set, with the electrical motor speed (nEM) is varied in a speed range between a transmission input speed (nGE) as a lower limit, and a combustible engine speed (nVM) as an upper limit.

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