
	The stand configuration incorporates PID closed-loop control of speed and pressure, real-time measurements of torque, speed, pressure, temperature, viscosity and reaction ring position for variable displacement pumps.

Transmission pump testing is conducted on a precision test stand for pump performance and comparative evaluations at Southwest Research Institute (SwRI). The stand configuration incorporates PID closed-loop control of speed and pressure, real-time measurements of torque, speed, pressure, temperature, viscosity and reaction ring position for variable displacement pumps. Automated real-time data acquisition is performed through a HP3852 and HP332 computer system providing test point and data repeatability within 0.75 percent in a three-signal distribution.

The major components of the stand consist of a 20-hp AC motor, variable frequency drive, 1,000 in.-lb in-line rotary transformer, temperature compensated pressure transducer, parallel heater exchanger circuit, driven by a 5-hp motor and pump system, a coriolis type flow meter and 5 kW immersion heater.

Low temperature testing to -40°F is possible by incorporating a separate chiller circuit feeding the heat exchanger.

Operating parameters and accuracies are as follows:

0–7200 rpm	±rpm	Control
0–1,000 in-lb	±2 in-lb	Measuring
0–-250 psi	±1 psi	Control
75–275 °F	±1 °F	Control
0–25 gpm	±0.01 lb/min	Measuring
0-1,000 centistokes	±0.1 cSt	Measuring

For more information about drivetrain engineering capabilities and past project briefs at SwRI or how you can contract with SwRI, please contact Douglas Fussner at dfussner@swri.org or (210) 522-3972.

Contact Information

Douglas Fussner

Drivetrain Design and Development

(210) 522-3972

dfussner@swri.org

Related Terminology

transmission test
facility

transmission testing

automatic
transmissions

drivetrain database

drivetrain
engineering

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Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 11 technical divisions.

September 30, 2008