- Electronic fuel injection system
The electronic fuel injection system of gasoline engine can be divided into two main parts: air supply system and fuel supply system. The air supply system provides clean air to the engine and controls the intake volume according to the engine working conditions. The fuel supply system supplies the engine with the best metered fuel.
In the engine electronic fuel injection system (EFI), the electronic control unit (ECU) mainly determines the basic injection volume based on the intake volume, and then corrects the injection volume based on the sensor signals such as the coolant temperature sensor and the throttle position sensor, so that the engine can obtain the best concentration of mixed gas under various operating conditions, thereby improving the engine's power, economy and emissions. In addition to the injection volume control, the electronic fuel injection system also includes injection timing control, fuel cut-off control and fuel pump control.
- Electronically controlled ignition system
The main function of the electronically controlled ignition system (ESA) is to control the ignition advance angle. The system judges the engine's operating conditions and operating conditions based on the signals of various related sensors, selects the most ideal ignition advance angle to ignite the mixture, thereby improving the engine's combustion process to achieve the purpose of improving engine power, economy and reducing emission pollution. In addition, the electronically controlled ignition system also has the functions of power-on time control and detonation control.
The electronically controlled ignition system is generally composed of sensors, ECU, ignition coils, spark plugs, and ignition fault alarms. The electronically controlled ignition system generates sparks under high voltage and ignites the mixture compressed in the cylinder at the best timing. According to the signals received from various sensors, the engine ECU implements control to achieve the best ignition timing.
- Idle Speed Control System
The idle speed control system (ISC) is an engine auxiliary control system. Its function is to control the engine's air intake through the idle speed control valve under engine idle conditions according to the engine coolant temperature, whether the air conditioning compressor is working, whether the transmission is in gear, etc., so that the engine can run at the optimal idle speed at any time.
Transmission control system
The electronically controlled hydraulic automatic transmission is formed by adding an electronic control system to the hydraulic transmission. The electronically controlled hydraulic automatic transmission monitors the operating status of the car and the engine through sensors and switches, and converts the information obtained into electrical signals and inputs them into the electronic control unit. Based on these signals, the electronic control unit controls the shift valve of the hydraulic control device through the solenoid valve to open or close the oil circuit leading to the shift clutch hand brake, thereby controlling the shift timing and the change of gear position to achieve automatic shifting.
The electronically controlled hydraulic automatic transmission converts parameters such as engine speed, throttle opening, vehicle speed, engine water temperature, and automatic transmission hydraulic oil temperature into electrical signals through various sensors and inputs them into the computer; the computer sends electronic control signals to the shift solenoid valve, oil pressure solenoid valve, etc. according to these electrical signals and the set shift rules; the shift solenoid valve and oil pressure solenoid valve then convert the electronic control signals of the computer into hydraulic control signals, and the various control valves in the valve plate control the action of the shift actuator according to these hydraulic control signals, thereby achieving automatic shifting.
