Clutch Torque Estimation of Ball-ramp Dual Clutch Transmission using Higher Order Disturbance Observer

Ball Ramp Dual Clutch Transmission (BR-DCT) was developed for clutch torque estimation by reducing the energy consumption of the clutch actuator by using a self-energizing mechanism. However, due to model uncertainty, the estimation accuracy of the friction coefficient is poor. Therefore, this manuscript proposed a clutch torque estimation method using a higher order disturbance observer designed to estimate the time series disturbance. The proposed method was verified by powertrain test bench experiment. During the verification process, the order and pole of the target disturbance were determined.As a result of the estimation verified by experiment, the estimation accuracy using the proposed clutch torque estimation method is improved by about 20% compared to the actuator model-based estimation result, and this is expected to improve the accuracy and stability during clutch torque control.