Modeling of a Wedge Clutch in an Automatic Transmission

Paper #:
  • 2010-01-0186

Published:
  • 2010-04-12
Citation:
Yao, J., Chen, L., Yin, C., Shu, J. et al., "Modeling of a Wedge Clutch in an Automatic Transmission," SAE Technical Paper 2010-01-0186, 2010, https://doi.org/10.4271/2010-01-0186.
Pages:
9
Abstract:
A wedge clutch with a wedge ramp transfers the tangential force to an axial force. It has unique features of self-reinforcement and small actuation force, and can be packaged into tight spaces. This wedge clutch can be developed to apply to an automatic transmission (AT) or a hybrid transmission.This paper focuses on the simulation of one wedge clutch in AT during shifting. A mathematical formula is given to describe the self-reinforcement principle of the wedge. The dynamic model of a motor actuated wedge clutch during shifting is built to simulate and develop the control algorithm. The model is implemented in Matlab/Simulink, which includes a DC motor model, a dynamic model of the wedge mechanism and clutch pack, and a driveline model of AT which can simulate a gear shift process.The key characteristics such as variation of normal pressure, response time and energy consumption are evaluated, and the results show a favorable comparison with the traditional hydraulic clutch.
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