SHIFT SCHEDULING METHOD FOR CLUTCH ENERGY LIMITATION

摘要

G-4369 C-4269 SHIFT SCHEDULING METHOD FOR CLUTCH ENERGY LIMITATION An improved method of scheduling ratio shi the normal shift schedule to avoid shift-related overheating of the torque transmittinq devices of the transmission. In normal operation, transmission shifting is scheduled by comparing measured vehicle speed and engine throttle position values with predefined load data. In the background, the transmission controller determined the cumulative thermal energy stored in the torque transmitting devices. If excessive energy is indicated, the normal shift schedule is modified to allow extended operation in the lower speed ratios. When the cumulative energy indication returns to a normal level, normal shift scheduling is resumed.