Servo-Pump Hydraulic Control System Performance and Evaluation for CVT Pressure and Ratio Control
نویسنده
چکیده
Fluid pumping losses are one of the major sources of torque loss in modern Continuously Variable Transmissions (CVTs) due to the high pressures and flow rates required in the hydraulic control system. To reduce the magnitude of these losses, researchers at UC Davis have developed a servo-pump control system for CVTs designed for improved pressure and ratio controllability with minimal power consumption. This paper includes a description of the control system concept and configuration as well as an evaluation of the power draw of the system. The results of vehicle testing show that the servo-pump CVT control system reduces the control power required by more than 83%. Vehicle testing and simulation provide an estimate of the fuel economy gain that can be achieved using the servo-pump CVT control system in a hybrid-electric vehicle (HEV) application.
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