Mode Transition Control Assisted with Wet Brake Clutch for Compound Power-Split Transmission

Paper #:
  • 2017-01-1170

Published:
  • 2017-03-28
Abstract:
With the compound power-split transmission directly connected to engine in hyrbid vehicle, dramatic fluctuation of engine output torque resulted in strong jerks during mode transition from electric driving mode to hybrid driving mode. In order to enhance ride comfort and reduce the toruque gap during mode transition process, a coordinated control strategy is developed by taking well use of the engine, two motors, and wet brake clutch. Firstly, the mode transition process with clutch participation is described and analyzed. Secondly, engine output torque without combustion is modeled by utilizing the measured cylinder pumping pressure. And the dynamic model hybrid powertrain is deduced. Thirdly, a coordinated control strategy is designed to determine the desired motor torque, clutch torque, engine torque, and the moment of fuel injection. Active damping control with two degrees of freedom based on wheel speed observation is designed to mitigate the driveline speed oscillations. Finally, the effectiveness of coordiated control strategy is verified by simulation and bench test. The simulation and experimental results indicate that the proposed strategy is effective to suppress vehicle jerks and reduce mode transition time.
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