Engine Electronic Control System

The engine electronic control system, referred to as the electronic control system, is to control the ignition, fuel injection, air-fuel ratio and exhaust emissions of the engine, so that the engine can work in the best state, so as to achieve good vehicle performance, save energy and reduce exhaust emissions. Purpose.

The engine electronic control system mainly includes: electronically controlled ignition system (ESA), electronically controlled fuel injection system (EFI), exhaust gas recirculation control (EGR) and idle speed control system (ISC), intake control system, etc. Generally speaking, other control systems other than the electronically controlled fuel injector system and the electronically controlled ignition system are collectively referred to as auxiliary control systems.

Electronically controlled fuel injection system: including fuel injection quantity control and injection timing control.

The ECU mainly determines the basic fuel injection amount according to the intake air amount signal provided by the air flow sensor, and then corrects the fuel injection amount according to the signals of other sensors (such as coolant temperature sensor, throttle position sensor), which can effectively control the air-fuel ratio of the mixture , so that the air-fuel ratio of the engine can reach the best value under various operating conditions, and the mixture with the best concentration can be obtained under various operating conditions, so as to achieve the effects of improving power, reducing fuel consumption, and reducing exhaust pollution.

Electronically controlled ignition system

The main functions are ignition advance angle control, power-on time (closed angle) control and constant current control. The system enables the engine to judge the operating conditions and operating conditions of the engine according to the relevant sensor signals at different speeds and under different load conditions, select the most ideal ignition advance angle to ignite the mixture, and control the engine according to signals such as battery voltage and speed. The energization time of the primary circuit of the ignition coil, thereby improving the combustion process of the engine, enabling the engine spare parts to output maximum power and torque, while reducing fuel consumption and emissions to a minimum. In addition, the system can perform knock control.

Air intake control system

Function: According to the change of engine speed and load, the intake air of the engine is controlled to improve the charging efficiency of the engine, thereby improving the power performance of the engine.

Including harmonic intake charging system (ACIS), exhaust gas turbocharging system, variable valve timing system, electronically controlled throttle system (ETCS), etc.

Idle speed control system

The idle speed control (ISC) system can control the intake air volume of the engine through the idle speed control valve according to the engine coolant temperature, whether the air conditioner compressor is working, whether the transmission is in gear, etc. Operate at optimum idle speed.

Emission Control System

Electronically controls the operation of the engine emission control device. Emission control mainly includes gasoline vapor emission (EVAP) control system, exhaust gas recirculation (EGR) control system, oxygen sensor and three-way catalytic conversion (TWC) control system, secondary air injection control system, etc.

Self-diagnostic system

It is used to prompt the driver that the engine is faulty; at the same time, the system stores the fault information in the memory in the form of a set number (fault code) to help the maintenance personnel determine the type and scope of the fault.

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