How Ecu Works Diagram

Most cars have also built in control system in their ecu for controlling idle speed.

How ecu works diagram. A modern ecu might contain a 32 bit 40 mhz processor. It plays a central role in an efi system much like a carburetor and a distributor did in an old school mechanical system. The output of an oxygen sensor is an analog voltage usually between 0 and 1 1 volts v. If the injector ground circuit is turned on the fuel is sprayed at the back of the intake valve.

The processor only understands digital numbers so the analog to digital converter changes this voltage into a 10 bit digital number high level digital outputs on many modern cars. Like any computer an ecu has a bunch of inputs and outputs. Also complete explanation for the function of an ecu and its history. Ecu adjust the exact timing of the spark or the ignition timing to provide the better power and economy.

Ecu detects itself whether there is the problem in the compression stroke or not and works according and set the timing of ignition. A fuel injection ecu works by pulsing or controlling the fuel injectors in the engine. In this video we go back to the basics and explain what exactly an ecu is and how it works. Analog to digital converters these devices read the outputs of some of the sensors in the car such as the oxygen sensor.

Explanation for the term ecu in the automotive context. An engine control unit ecu also commonly called an engine control module ecm is a type of electronic control unit that controls a series of actuators on an internal combustion engine to ensure optimal engine performance. Today s can or controller area network communication arrays are difficult and complex and so is it s diagnostic. This may not sound fast compared to the 500 to 1 000 mhz processor you probably have in your pc but remember that the processor in your car is running much more efficient code than the one in your pc the code in an average ecu takes up less than 1 megabyte mb of memory by comparison you probably have at least 2 gigabytes gb of.

It s one of the most requested topics so we hope it ll shed some light on the subject and help you. This is done by switching the injector ground circuit on or off depending on what is required by the engine. It does this by reading values from a multitude of sensors within the engine bay interpreting the data using multidimensional performance maps called lookup tables. An ecu is a computer designed to control ignition and injection in an engine.

Learn to test these larger units here with wiring diagram interpretation in mind. In this article we go back to the basics and explain what an ecu is and how it works. Engine management system ems.