Design and Analysis of a Transmission Hydraulic System for an Engine-Flywheel Hybrid-Vehicle

[+] Author and Article Information
A. M. Karmel

Trilby Vehicle Systems, General Motors Research Laboratories, Warren, Mich. 48010

J. Dyn. Sys., Meas., Control 112(2), 253-260 (Jun 01, 1990) (8 pages) doi:10.1115/1.2896133 History: Received June 07, 1988; Revised February 21, 1989; Online March 17, 2008


Unlike hydraulic systems of conventional automotive transmissions, the hydraulic system of a hybrid vehicle must cope with large variations of pressure as well as flow. If supplied by traditional pump configurations, either fixed or variable displacement, the system will incur substantial efficiency losses. This paper presents a feasibility study of a dual-pump hydraulic supply system which consists of a low-volume fixed-displacement pump and a high-volume variable-displacement pump. The analysis addresses the dynamic characteristics of this system along with its sensitive design areas.

Copyright © 1990 by The American Society of Mechanical Engineers
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