In the internal combustion engine, the term Engine Control Module, ECM, is used to refer to a special device that is that is used for the purpose of controlling a series of actuators. The term Engine Control Unit, ECU, may be used in the place of Engine Control Module. The primary function of the ECM is to ensure that the performance of the engine is optimal. The ECM usually accomplish this by reading a number of values that are drawn from the sensors which are located at the engine cove. The ECM then interpret these values by use of the look up tables and then adjusting the actuators of the engine. Before the implementation of the Truck ecu in engines, the mixture of air and fuel, the timing of the ignition the control of the idle time were all mechanically controlled. The pneumatic control means were also used to control the same.
The Detroit ecm is meant to control a number of processes in the internal combustion engines. This includes the control of the air-fuel mixture, the control of the idle speed, the control of the variable valve timing and the control of the electronic valves. The delivery of the fuels to the engine cylinders is completed through injection by most of the recent engines. In this engines, the ECM is used to control the amount of fuel that is injected to the cylinder with regard to the readings obtained from the sensors. The sensors which controls the oxygen guides the ECM by telling whether the engine is running rich or lean.
There are those engines which have the variable valve timing, VVT. This is generally the process that is used to alter the timings of the of the valve events so as to improve the fuel economy, reduce emissions and in the same time increasing the fuel performance. The ECM basically controls VVT by controlling engine cycles of opening the valves. At higher speeds, the valves are usually opened fast as compared to lower speeds. Generally, most of the engines are made with the idle speed controls incorporated within the ECM. Idle speed may be defined as the rotational speed run by the engine during idling. There are internal combustion engines that have been made with full electronic control of the exhaust and the intake valve opening. The ECM in this case functions by controlling the opening and closing the of the valves. The area of the valve opening is also controlled by the ECM.
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