Features

• Control unit for 4 and 5 gear automatic transmissions
• 32-bit microcontroller
• Temperature range - 40°C to + 85°C

Principle of operation

The transmission control unit operates a stepped automatic transmission. It controls all the transmission functions (shifting operations) and the torque converter lockup clutch of the transformer. Sensors register the output and driving speed (according to the torque converter) of the transmission. Furthermore a temperature transducer located in the transmission is valuated and the current gear detected.

The transmission control unit has various sub-functions as well:

• Determination of the driving speed
• Determination of the output speed
• Detection of transmission selector lever
• Activation of the switch valves (shifts)
• Activation of the valves for oil pressure regulation
• Activation of the valve to control the converter lockup
• Guaranty the communication
• Output for start interlock for transmission (hardware detection)