초록

A method of torque phase shift control for an electronic automatic transmission system to determine the apply rate of a fluid actuating device and adjusts the same to match the torque build-up of the apply element to the torque fall-off of the release element during shifting of the transmission.

대표청구항 ▼

In a vehicle having an engine with throttle means and a transmission system including an input member, an output member, a torque converter assembly for transmitting torque between the engine and the input member, the torque converter assembly having a turbine operatively connected to the input memb

In a vehicle having an engine with throttle means and a transmission system including an input member, an output member, a torque converter assembly for transmitting torque between the engine and the input member, the torque converter assembly having a turbine operatively connected to the input member, a gear assembly for changing the ratio of torque between the input member and output member, a plurality of friction elements for shifting the gear assembly, a fluid actuating device adapted to move for applying at least one friction element, at least one solenoid-actuated valve adapted to move and having logical operating states in response to the presence or absence of electrical power to the valve for directing fluid flow between a fluid source and the fluid actuating device, sensors providing signals indicative of measurement data for predetermined conditions, a controller having memory for processing and storing the signals and predetermined values and providing signals to control the solenoid-actuated valves, a method of matching the torque build-up of the apply friction element to the torque fall-off of the release friction element, said method comprising the steps of: selecting a predetermined duty cycle for the apply friction element based on the throttle position of the throttle means on the engine; learning an adjustment to the selected predetermined duty cycle; summing the selected predetermined duty cycle and the learned adjustment to the duty cycle to obtain a torque phase duty cycle value; and using the obtained torque phase duty cycle for duty cycling the apply friction element during the shift of the gear assembly to match torque build-up of the apply friction element to torque fall-off of the release friction element.