Clutch Position Control for an Automated Manual Transmission Using Electromechanical Actuators

Document Type : Research Article

Authors

1 Imam Khomeini International University, Buin Zahra Higher Education Center of Engineering and Technology, Qazvin, Iran.

2 Department of Mechanical Engineering, Technical and Vocational University (TVU), Tehran, Iran.

Abstract

In this paper, an adaptive sliding mode controller with variable gains to cope with uncertainties is proposed for an electromechanical clutch position control system to apply in the automated manual transmission. Transmission systems undergo changes in parameters with respect to the wide range of driving conditions, such as changes in friction coefficient of clutch disc and stiffness of diaphragm spring, hence, an adaptive robust control method is required to overcome the uncertainties and disturbances. As the majority of transmission dynamics variables cannot be measured in a cost-efficient way, a non-linear estimator based on an unscented Kalman filter is designed to estimate the state valuables of the system. Also, a non-linear dynamic model of the electromechanical actuator is presented for the automated clutch system. The model is validated with experimental test results. A numerical simulation of a reference input for clutch bearing displacement is performed to evaluate the performance of the designed controller and estimator. To evaluate the performance of the proposed control system the root mean square value of the position tracking error has been used. The results of the analysis indicate higher efficiency of the adaptive controller designed to improve the position tracking error compared to the conventional sliding mode controller.

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