Clutch slip control of automatic transmissions: A nonlinear feedforward-feedback design

Abstract

To improve the shift quality of vehicle with clutchto-clutch gear shifts, a nonlinear controller based on flatness is proposed for the clutch slip control during the inertia phase. A nonlinear feedforward control is designed in consideration of the system nonlinearities, and a linear feedback control is given to accommodate the model errors and the disturbances. The proposed control scheme has small computational demand and the complex nonlinear characteristics of powertrain system appear in their original form of lookup tables. Finally, the designed controller is tested on an AMESim powertrain simulation model, which contains a time-variant model of clutch actuators.

Robust Feedback Tracking Controller Design for Self-Energizing Clutch Actuator of Automated Manual Transmission

“…When the clutch is completely disengaged, the following dynamics applies to the system. (4) where no external torque other than the actuation torque and friction torque is involved. Here, the actuation torque can be expressed as follows.…”

“…Through the use of torque converter, it can operate without having to operate the clutch. However, such use of torque converter induces energy loss, since slipping is allowed in the driveline (despite the previous works to effectively control the lock-up clutch [1,2,3,4]). Also, the unit cost is relatively higher than that of traditional manual transmission.…”

Vehicle creep control based on nonlinear robust method for dual-clutch transmission

“…Meanwhile, another kind of controller design method is using nonlinear control to track a reference trajectory for clutch slip control. Gao et al 6,7 proposed a nonlinear controller with feedforward-feedback control scheme for clutch slip control during shift inertia phase. Liu et al 8 introduced a controller using triple-step nonlinear method to deal with the nonlinear parameter-varying for clutch control.…”