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Shift Feel Testing
Project BriefAs drivers demand higher standards for vehicle performance, shift harshness is no longer acceptable. Southwest Research Institute (SwRI) has conducted considerable vehicle shift feel testing and evaluation with specially trained evaluators. The evaluators quantify the rate of change of acceleration (jerk) of the vehicle.
To eliminate the subjective nature of these measurements, SwRI has developed test methods to evaluate shift feel characteristics outside the vehicle. The entire powertrain is installed on a dynamometer test stand, and the engine and transmission or transaxle are physically separated so an in-line torque transducer can be interspersed between them. All electrical sensors and controllers are installed.
Downstream of the transmission and transaxle is an eddy current dynamometer to simulate parasitic losses and aerodynamic drag. Connected to the output are inertia wheels that simulate a vehicle weight and rolling radius.
Output torque is obtained with high-speed data acquisition equipment at 100 Hz. The resulting torque curve versus time is digitally differentiated to determine the rate of change of torque with respect to time.
For more information about our drivetrain engineering capabilities and past performance briefs, or how you can contract with SwRI, please contact Douglas Fussner at dfussner@swri.org or (210) 522-3972.
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| Design and Development | Engine, Emissions & Vehicle Research Division | SwRI Home | | ||||||||||||
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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. | ||||||||||||
December 28, 2012 | ||||||||||||
