Clutch Transmissible Torque Estimation for Dry Dual Clutch Transmission Control
Driven by a strong pressure for fuel efficiency and dynamic performance, dual clutch transmission system is focused as next generation system. The online estimation of the characteristic curve of the clutch transmissible torque as a function of the actuat
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Abstract Driven by a strong pressure for fuel efficiency and dynamic performance, dual clutch transmission system is focused as next generation system. The online estimation of the characteristic curve of the clutch transmissible torque as a function of the actuator position is essential for precise clutch engagement control. For precise estimation of the clutch transmissible torque, nonlinear torque transfer model of dry clutch is defined and the sliding mode observer algorithm is implemented in the dual clutch transmission (DCT) control strategy to compensate the changes in clutch characteristic curve. Unknown input observer compensates modeling and estimation error. The dry clutch toque observers allow a better estimation of the actual transmitted clutch torque when activating the clutch engagement control. The stability and performance of estimation algorithm are verified by simulation result. Keywords Dual clutch transmission adaptation Sliding mode observer
Dry clutch Clutch torque Torque curve
1 Introduction Recently, restrictions on emission of vehicle are getting strict and requests on improvement of fuel efficiency are increasing. New technology in order to improve fuel efficiency and increase effectiveness of transmission system is being studied F2012-C04-021 K. Han (&) Continental Automotive Systems, Seoul, Korea e-mail: [email protected] Y. Yoon Department of Mechanical Engineering, University of Minnesota, Minneapolis, USA
SAE-China and FISITA (eds.), Proceedings of the FISITA 2012 World Automotive Congress, Lecture Notes in Electrical Engineering 193, DOI: 10.1007/978-3-642-33744-4_39, Ó Springer-Verlag Berlin Heidelberg 2013
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K. Han and Y. Yoon
actively by many researchers, and dual clutch transmission (DCT) which is a combination of both auto transmission system’s advantages and manual transmission’s advantages is focused as a next generation transmission system [1–3]. DCT has advantages of both automatic and manual transmission, but it requires accurate and precise control to adjust complicated system. Especially the clutch control is a key element for the driving comfort during standing-start and gear shifting maneuvers in dual clutch transmission vehicles. Furthermore, online estimation of the characteristic curve of the clutch transmissible torque as a function of the actuator position is essential for precise clutch engagement control. In previous studies, simplified linear estimation algorithm was applied without considering clutch speed effect. In this paper, for more precise estimation of the characteristic curve of the dry clutch, nonlinear model is defined and sliding mode torque observer is proposed. The sliding mode observer algorithm implemented in the low level of the DCT strategy has as its main purpose the compensation of the changes in clutch characteristic curve. The sliding mode observers allow a better estimation of the actual transmitted clutch torque when activating the clutch engagement control. The stability and performance of est
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