Ratio Calibration of Electro-Mechanical Dual Acting Pulley Continuously Variable Transmission System

摘要

This paper introduces an electro-mechanical dual acting pulley (EMDAP) continuously variable transmission (CVT) and presents ratio calibration of EMDAP CVT system. The desired speed ratio is set manually by adjusting the primary and secondary axial pulley positions accordingly by controlling both primary and secondary DC motors. The real speed ratio is calculated based on input and output shaft speed measurements, while the geometrical ratio is indirectly determined from primary and secondary axial pulley positions obtained from pulley gap measurements. The geometrical ratio is validated using speed ratio. Based on this validation, all corresponding values of primary and secondary pulley positions, output voltages of pulley position sensors as well as output voltages of shaft speed sensors are recorded and used as reference data for future calibration and ratio control applications.