Control of the automatic transmission

The control of the automatic transmission consists essentially of the transmission control module and the hydraulic selector unit.

More detailed functional description, see BMW Technology:

TIS -> Document -> SI Technology -> SBT Number

• 2401 05 106
  

Transmission Control

The transmission control is divided mainly into the following components:

• Transmission control module:
  
  • Power supply for solenoid valves and electronic pressure control valves
    
  • Evaluation of the sensor system
    
• Transmission sensor system:
  
  • Sensor for the transmission input speed
    
  • Sensor for the transmission output speed
    
  • Transmission oil temperature sensor
    
• Gearbox actuator system:
  
  • Solenoid valves
    
  • Electronic pressure actuators
    
• Gearbox connector for connection to the gearbox and vehicle wiring harness
  

Transmission control module

On this transmission, the transmission control module is fitted as a separate control module. Firstly, it evaluates the sensors electronically and directly activates the actuators of the hydraulic selector unit. A temperature sensor additionally monitors the gearbox oil temperature.

Hydraulic selector unit

The hydraulic selector unit in the gearbox is similar to the hydraulic modules commonly used until now in gearboxes. It contains the hydraulic actuator system (solenoid valves, electronic pressure actuators) of the gearbox.