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An engine control unit (ECU), also called an engine control module (ECM), [1] is a device that controls various subsystems of an internal combustion engine. Systems commonly controlled by an ECU include the fuel injection and ignition systems.
An ECU from a Geo Storm An electronic control unit ( ECU ), also known as an electronic control module ( ECM ), is an embedded system in automotive electronics that controls one or more of the electrical systems or subsystems in a car or other motor vehicle .
Of all the electronics in any car, the computing power of the engine control unit is the highest, typically a 32-bit processor. [citation needed] A modern car may have up to 100 ECU's and a commercial vehicle up to 40. [citation needed] An engine ECU controls such functions as: In a diesel engine: Fuel injection rate; Emission control, NOx control
Remapping is the simplest form of stage one engine tuning; it is performed mostly on turbocharged vehicles containing a modern Engine Control Unit (ECU). Almost all modern vehicles have an ECU, primarily supplied by Bosch or Delphi Technologies. The ECU has firmware that controls the various parameters under which the engine runs. These ...
Preliminary design work in EEC-IV started even before EEC-III was in production. Over time, there were many different modules designed around this processor. It is likely that more Ford vehicles were produced using Engine/Powertrain Control Modules (ECM/PCM) based on variations of this design than any other module that Ford has ever used.
These electronic systems typically work in conjunction with the engine control unit (in a similar way to road cars), and are responsible for operating electronic throttle control, clutch and gearshift actuation (via an electric, hydraulic, or pneumatic actuator), gearshift time and speed, sensors, switches, solenoids, and other hydraulic ...
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What made this ECU special was the use of two crank sensors and one cam sensor. The ECU used one crank sensor to count the teeth on the starter ring for its RPM signal, and the other read a pin on the back of the flywheel for TDC reference. This ECU was first seen when the 20V turbo 5-cylinder engine (RR Code) was installed into the Audi Quattro.