Functional Requirements

The control unit sends the shift pulses for upshifts and downshifts to the transmission control unit (solenoid valves, modulation pressure) and decides upon the corresponding torque converter clutch engagement, taking comfort and safety into consideration. For this purpose, it processes in a computer program the input variables such as engine speed, output speed, injection signal, throttle (accelerator pedal) position, kick-down switch, drive program, selector lever position, A/C compressor and oil sump temperature.