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Stability Analysis of a Force-Aided Lever Actuation System for Dry Clutches with Negative Stiffness Element

Journal of Shanghai Jiaotong university(Science) 2018年第2期23卷 218-226页

作者： LIU Fengyu a b c CHEN Li a a.State Key Laboratory of Ocean Engineerin b. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploratio c. National Laboratory of Automotive Electronics and Control Shanghai Jiao Tong University Shanghai 200240 China

A force-aided lever with a preload spring is not only force-saving but also energy-saving. Therefore, it has great potential to be applied to dry clutch actuations. However, the negative stiffness of the clutch diaphragm spring introduces unstable dynamics which becomes more intensive due to the preload spring. In order to explore the intensified unstability, this paper builds dynamic models for the rotating lever coupling a negative stiffness diaphragm spring and a preload spring. The stability analysis using the Routh-Huiwitz criterion shows that the open-loop system can never be stable due to the negative stiffness. Even if the diaphragm spring stiffness is positive, the system is still unstable when the preload of the spring exceeds an upper limit. A proportionalintegral-derivative(PID) closed-loop scheme addressing this problem is designed to stabilize the system. The stability analysis for the closed-loop system shows that stable region emerges in spite of the negative stiffness; the more the negative stiffness is, the less the allowed preload is. Further, the influences of the dimensions and PID parameters on the stability condition are investigated. Finally, the transient dynamic responses of the system subjected to disturbance are compared between the unstable open-loop and stabilized closed-loop systems.

关键词： negative stiffness preload spring stability dry clutch actuation system force-aided lever

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