On the high-speed gasoline engine of modern automobiles, an ignition system controlled by a microprocessor, also known as a digital electronically controlled ignition system, has been adopted. This ignition system consists of three parts: microcomputer (computer), various sensors and ignition actuators.
In fact, in modern engines, the two subsystems of gasoline injection and ignition are controlled by the same ECU, using a set of sensors. The sensors are basically the same as those in the electronically controlled gasoline injection system, such as crankshaft position sensors, camshaft position sensors, throttle valve position sensors, intake manifold pressure sensors, and knock sensors. Among them, the detonation sensor is a very important sensor for electronically controlled ignition (especially the engine with exhaust gas turbocharging device), it can monitor whether the engine deflagration and the degree of deflagration, as a feedback signal to make the ECU command to achieve ignition advance, so that the The engine does not detonate and can obtain higher combustion efficiency.