Abstract
A novel motor-driven clutch actuator with force-aided lever has been recently developed. A unique spring is used to assist apply of the clutch that can effectively reduce the motor power requirement, and the actuation system can save power consumption during clutch operations with faster response and higher control precision. In this article, a mathematical model of the conceptual clutch actuation system is developed to study the dynamic behavior of the actuator system via computer simulation. The actuator model is further integrated into a dual-clutch transmission and driveline system to demonstrate the effectiveness of the concept in shifting control. The simulation result demonstrates the smooth and fast clutch-to-clutch gear shift and hence validates the feasibility of this new force-aided lever actuation system.
Highlights
The automotive transmission is currently edging toward improving powertrain system efficiency and driving comfort
Clutch actuation is a key component in the clutch control system,[4] and depending on the transmission type and clutch actuation needs, clutch control can be executed with different actuation mechanisms, for automated manual transmission (AMT),[2,5] dual-clutch transmission (DCT),[3,6] and various hybrid transmission.[7,8]
The results show that this new force-aided lever actuator system is sufficient for clutch-to-clutch gear shift control
Summary
The automotive transmission is currently edging toward improving powertrain system efficiency and driving comfort. One mechanism proposed by Jianwu Zhang releases the preloaded spring during clutch engagement assisting an actuation motor.[19,20] such design is not able to reduce the motor size as the aiding force decreases rapidly with the engagement travel, where bigger actuation force is required Another design involves a preloaded spring acting on a lever with a moving pivot,[21,22,23,24] which has been used on a six-speed dry DCT. The spring can store and release more energy to assist the clutch apply In this case, the aiding force becomes larger as the clutch piston travels during the engagement.
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