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ECU is a device that controls all the electronic features in a car. This may range from fuel injection to maintaining perfect cabin temperature to controlling braking and suspension.
Some vehicles have multiple ECU controlling different features while some have one controlling everything.
An electronic control unit receives input from one or several parts of the vehicle and uses that information to act if needed. For example, an airbag ECU receives information from crash sensors and seat sensors.
When there is a crash, the ECU decides which airbags to deploy depending on where passengers are sitting. Then it tells the actuators to deploy them. Then the actuators convert the electrical signal into the physical value needed, using valves, injectors, or relays.
Vehicles may contain over 100 ECUs that in addition to essential functions, like engine performance and power steering, control comfort and security features, such as parking assistance, memory seats and airbag deployment.
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