BMW, in 1979, built the first Digital Motor Electronics system which was used in the BMW 732i.
By controlling vital components of a BMW engine’s operations, the Digital Motor Electronics (DME) is a broad system which ensures:
- Optimal dependability
- Exceptional performance
- Best fuel efficiency achievable
- Lowest emissions possible
The BMW DME sensors regularly monitor all components which affect engine operation. The data collected by the sensors is then matched by the computer’s processor to a look-up table which is then converted into instructions for the ignition and fuel injection systems.
Data collected from the BMW DME is verified by matching it with the rest of the system’s preset data. Should a defective sensor convey impractical data, the BMW DME reinstates stock preset values. Should an individual sensor or the spark plug deteriorate, the BMW DME instantly stops fuel from flowing to the cylinder to avoid damaging the engine. This is referred to as selective injector cutoff.
The BMW DME system collects about 1200 distinct data responses per second, comprising:
- Engine speed
- Air-intake mass volume
- Throttle position
- Air temperature & density
- Coolant temperature
- Vehicle speed
The BMW DME also analyzes the electrical system with sensors that check both the battery’s condition and level of charge, along with up-to-date energy consumption. This is necessary to protect the vast amount of electronic engine components. BMW owners help prevent damaging the electronics and battery, as well as extend battery life, by keeping their battery fully charged. As an added benefit, fully charged batteries help ensure the engine always starts easily.