The engine ECU is a key component of the electronic control system of an electronically controlled engine (comprising sensors, actuators and the electronic control unit (ECU)). Its function is to acquire and process input signals from various sensors, perform control-decision calculations according to engine operating requirements (injection pulse width, ignition advance angle, etc.), and output the corresponding control signals. In addition to fuel injection control, today's electronically controlled engines also control ignition, EGR, idling and the wastegate of turbocharged engines. Since a single ECU is used to comprehensively control the engine, it is also called the engine management system.