Engine Control Modules (ECU)
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The Engine Control Module Is Part Of Your Engine’s Brain
BMW was the first car manufacturers to realize that car engines needed an automated device to manage several engine functions simultaneously. The 1939 BMW 801 14-cylinder aviation engine was the first engine designed with an engine control module (ECU), and it operated by a single throttle lever.
Controlling the fuel mixture, ignition timing, idle speed, and variable valve timing aren’t the main topic of conversation when consumers buy a new car. All of those functions are taken for granted. Consumers expect the engine to operate like a fine tuned instrument with a mechanical brain, and they do thanks to engine control modules. ECUs determine the amount of fuel to inject based on the amount of air that’s passing thru the engine. Fuel injected engines need the assistance of a functioning ECU to operate smoothly.
A spark ignition engine needs a spark to get it up and going. The ECU adjusts the timing of the spark to initiate combustion in the combustion chamber. If the ECU detects an engine knock it will delay the timing of the spark to correct that potential engine issue. If the engine is operating in a low RPM range for the amount of work required, the ECU will downshift the manual transmission to correct the pinking or knocking.
Idle speed control is built into the ECU in most engines. The crankshaft position sensor monitors engine RPMs, and that plays a role in timing functions for fuel injection, valve timing, and spark ignition as well. When an engine is equipped with variable valve timing, the ECU controls the time when the valves open. Valves usually open faster at higher speeds than at lower speeds. That function optimizes the flow of air into the engine, which helps increase power and the economy of the engine.
