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International Journal of Automotive Technology > Volume 12(4); 2011 > Article
International Journal of Automotive Technology 2011;12(4): 537-544.
doi: https://doi.org/10.1007/s12239-011-0063-3
MULTI-STATE CONTROL STRATEGY OF STARTING FOR A WET FRICTION CLUTCH VIA A FUZZY LOGIC ALGORITHM
L. HE, L. LI, L.-Y. YU, J. SONG
Tsinghua University
ABSTRACT
Wet multi-plate friction clutches are used in automotive drivelines to transfer torque, change gears, and prevent motion by locking-up components in the transmission. The control strategy of starting is a crucial technology for the application of a wet multi-plate friction clutch in the automotive industry. In this paper, a multi-state fuzzy control strategy for starting is presented and applied to a continuously variably transmission (CVT) powertrain for the validation of this strategy. The operation of the clutch was divided into four states: parking, starting, riding and emergency. The starting state was investigated in detail. A fuzzy algorithm was employed to control the pressure of the hydraulic cylinder acting on the clutch. A distinguishing feature is that the pressure does not increase but decreases to implement smooth starting during the initial period of starting. The rapid-control prototype (RCP) of the wet friction clutch was developed to validate the new control strategy onboard a test vehicle. Based on the experimental results, the multi-state control strategy for a wet friction clutch is a viable candidate for engineering applications.
Key Words: Wet friction clutch, Starting, CVT, RCP, Fuzzy control
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