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Proceedings Paper

Piezoelectric-hydraulic pump based band brake actuation system for automotive transmission control
Author(s): Gi-Woo Kim; K. W. Wang
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Paper Abstract

The actuation system of friction elements (such as band brakes) is essential for high quality operations in modern automotive automatic transmissions (in short, ATs). The current band brake actuation system consists of several hydraulic components, including the oil pump, the regulating valve and the control valves. In general, it has been recognized that the current AT band brake actuation system has many limitations. For example, the oil pump and valve body are relatively heavy and complex. Also, the oil pumps induce inherently large drag torque, which affects fuel economy. This research is to overcome these problems of the current system by exploring the utilization of a hybrid type piezo-hydraulic pump device for AT band brake control. This new actuating system integrates a piezo-hydraulic pump to the input of the band brake. Compared with the current systems, this new actuator features much simpler structure, smaller size, and lower weight. This paper describes the development, design and fabrication of the new stand-alone prototype actuator for AT band brake control. An analytical model is developed and validated using experimental data. Performance tests on the hardware and system simulations utilizing the validated model are performed to characterize the new prototype actuator. It is predicted that with increasing of accumulator pressure and driving frequency, the proposed prototype actuating system will satisfy the band brake requirement for AT shift control.

Paper Details

Date Published: 27 April 2007
PDF: 10 pages
Proc. SPIE 6525, Active and Passive Smart Structures and Integrated Systems 2007, 65251E (27 April 2007); doi: 10.1117/12.714929
Show Author Affiliations
Gi-Woo Kim, The Pennsylvania State Univ. (United States)
K. W. Wang, The Pennsylvania State Univ. (United States)


Published in SPIE Proceedings Vol. 6525:
Active and Passive Smart Structures and Integrated Systems 2007
Yuji Matsuzaki; Mehdi Ahmadian; Donald J. Leo, Editor(s)

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