Stability and Regulation of a Variable-Displacement Vane-Pump

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

Project Trilby, General Motors Research Laboratories, Warren, Mich. 48090-9055

J. Dyn. Sys., Meas., Control 110(2), 203-209 (Jun 01, 1988) (7 pages) doi:10.1115/1.3152672 History: Received February 01, 1986; Online July 21, 2009


Pressure fluctuations may develop in the hydraulic system of automatic transmissions, even under steady-state conditions. To analyze this phenomenon, a dynamic model was developed for a system which consists of a variable-displacement vane-pump, a regulator, and a resistive load. The model was linearized and reduced to generate a stability criterion for the pressure-regulation circuit. This criterion determines a critical frequency that the natural frequency of the pressure-regulation valve must exceed to assure stability. This critical frequency depends primarily on the damping of the spool of the pressure-regulation valve and on its position; the latter is a function of the regulation-chamber leakage characteristics. The analysis shows that line pressure, flow and leakage, along with production tolerances and different opening conditions, have a significant effect on the stability of the hydraulic system. Test data support the analysis.

Copyright © 1988 by ASME
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