| 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 |
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| ABSTRACT |
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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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