Digital Motor Electronics

The DME digital engine electronics module is mounted on the intake system in the immediate vicinity of the engine, and is cooled by the flow of induction air. The design of the plug connections between the wiring harness and the DME digital engine electronics module ensures they remain sealed against water when the connectors are plugged in.

The DME digital engine electronics module furnishes the power to the sensors and actuators directly. The top of the DME digital engine electronics module seals the corresponding opening in the induction system.

The Digital Engine Electronics (DME) is the computing and switching center of the engine control system. Sensors on the engine and vehicle deliver the input signals. The signals employed to control the actuators are calculated using the input signals and the specified setpoint values stored in the Digital Engine Electronics (DME) as well as the characteristic maps. The DME digital engine electronics module activates the actuators directly or via relays.

Two sensors are located on the DME digital engine electronics module's printed circuit board:

• 1 Temperature sensor
• 1 Ambient barometric pressure sensor.

The temperature sensor monitors the thermal condition of the components in the DME digital engine electronics system. The ambient pressure is required for calculation of the mixture composition.

The following graphic shows the engine N55 as example.

Fig 1: Identifying Digital Engine Electronics System Components

Courtesy of BMW OF NORTH AMERICA, INC.