SHIFT CONTROL FOR AN AUTOMATIC TRANSMISSION

摘要

A system for controlling shifting includes an engine, a driven member, and a shiftable transmission including an input shaft coupled to the engine and an output shaft coupled to the driven member. The system further includes a plurality of sensors for monitoring parameters of at least one of the engine, the driven member, or the transmission, a torque converter disposed between the engine and the input shaft, and an electronic control unit including a processor and a memory. The electronic control unit is operable to receive sensed parameters from the plurality of sensors, determine a torque ratio across the torque converter based on the sensed parameters, determine a speed ratio associated with the torque ratio, determine a rotational speed of the input shaft based on the speed ratio and the sensed parameters, and make a shifting decision based on the rotational speed of the input shaft.

主权项

1. A system for controlling shifting, the system comprising:
an engine; a driven member; a transmission including an input shaft coupled to the engine and an output shaft coupled to the driven member, the transmission being shiftable to vary a gear ratio from the input shaft to the output shaft; a plurality of sensors for monitoring parameters of at least one of the engine, the driven member, or the transmission; a torque converter disposed between the engine and the input shaft; and an electronic control unit including a processor and a memory, the electronic control unit operable to
receive sensed parameters from the plurality of sensors,determine a torque ratio across the torque converter based on the sensed parameters,determine a speed ratio associated with the torque ratio,determine a rotational speed of the input shaft based on the speed ratio and the sensed parameters, andmake a shifting decision based on the rotational speed of the input shaft.