Modeling and Simulation of an Electric Clutch Actuator
For the development of an electric clutch actuator adopting DC motor and ball screw, a simulation model of the whole actuator system is set up using MATLAB/Simulink. At the same time, this chapter also gives a detailed introduction to the identification o
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Abstract For the development of an electric clutch actuator adopting DC motor and ball screw, a simulation model of the whole actuator system is set up using MATLAB/Simulink. At the same time, this chapter also gives a detailed introduction to the identification of the parameters. In the selection of motor parameters, the friction and spring parameters, lookup tables are used. By lookup tables, the model can get accurate data, and the simulation time can be reduced significantly. Keywords Clutch actuator
DC motor Ball screw Modeling Simulation
1 Introduction Automatic clutch system is not only an important part of AMT [1, 2] and DCT, it is also widely used in hybrid electric vehicles to implement the operations of gear shifting and mode-switching. Usually, automatic clutch is actuated by electrohydraulic, electro-pneumatic, or electro-mechanical systems. The electro-hydraulic (pneumatic) actuator contains a relatively complex system, including pump, tank and valves, etc. References [3, 4] introduced the design and simulation of this kind of F2012-C01-004 H. Yue B. Wang L. Yu B. Gao H. Chen State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, China H. Chen (&) Department of Control Science and Engineering, Jilin University, Changchun, China e-mail: [email protected]
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_4, Springer-Verlag Berlin Heidelberg 2013
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Fig. 1 Structure of automatic clutch actuator, 1 DC motor 2 Ball screw 3 Release lever 3 Clutch plate
actuators. Electro-mechanical actuator always adopts DC motor as the power source and worm-wheel or screw-nut as the speed reduction mechanism [5]. However, the transmission efficiency of worm-wheel and screw-nut is low (maybe less than 50 %), which affects the response speed of the actuator and consequently the dynamic performance of the vehicle is limited. Our Electro-mechanical actuator adopts ball screw as the speed reduction mechanism. Although ball screw is more expensive than sliding screw, the characteristics of ball screw include high transmission efficiency, short response time, long service time. This chapter first introduces the structure and working process of this automatic clutch. Part 2 describes the model establishment. In Part 3 we compare the simulation results and the actual operation of the automatic clutch actuator.
2 Structure and Working Process of Automatic Clutch Actuator This automatic clutch actuator mainly consists of DC motor, ball screw, load. There is no other gear set. The rotational motion of the DC motor is transformed into linear motion by the ball screw, and then the clutch lever is pushed (clutch disengaged) or released (clutch engaged). A potential meter is installed on the nut to measure the position of the clutch lever. DC motor is driven by an H-bridge circuit, which consists of 4 MOSFETs, and PWM control is used to modulate the mo
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