Engine Management System (EMS) uses a variety of sensors to convert the engine intake air volume, cooling water temperature, engine speed and acceleration and deceleration into electrical signals and send them to the controller. The controller compares these information with the stored information, and outputs control signals after accurate calculation.
The role of the (EMS) is to use various sensors to collect and measure various parameters of the engine, convert them into electrical signals acceptable to the ECU, and then perform logic operations through the ECU to issue instructions to the actuators, and finally through the fuel injector timing. Quantitative injection into the intake pipe, so that the engine can get the best concentration of mixed gas under various working conditions.
1. Electronic control unit.
The electronic control unit is the core of the engine electronic control system. It completes the collection of various parameters of the engine and the control of fuel injection volume and timing, and determines the function of the entire electronic control system.
2. Sensors.
3. Actuator.
Various control functions to be completed by the electronic control system are realized by various actuators. Precautions for automotive electronic control engine When the ignition switch is turned on (ON), do not disconnect any electrical equipment to avoid high instantaneous voltage due to the self-inductance of the coil, which will seriously damage the control unit and sensor.
When removing electronic control system components or connectors, first turn off the ignition switch (OFF) and remove the battery negative ground wire. It is not allowed to use the fast charger to directly jump-start a car with an electronically controlled engine. When arc welding a car with an electronically controlled system, the connector of the engine control unit should be disconnected to avoid damage to the control unit.
1. Activated carbon tank
2. Air flow meter
3. Throttle body
4. Carbon tank solenoid valve
5. Intake pressure sensor
6. Vortex control valve
7. High pressure oil poly
8. High pressure injector
9. Camshaft adjuster
10. Ignition module and spark plug
11. Camshaft position sensor
12. Front oxygen sensor
13. Engine control module
14. EGR valve
15. Speed sensor
16. Knock sensor
17. Engine temperature sensor 18. Main catalytic converter
19. Rear oxygen sensor
20. Secondary catalytic converter
21. CAN interface
22. Fault light
23. Diagnostic interface
24. Anti-theft control system control unit interface
25. Accelerator pedal module
26. Fuel tank
27. Electrically controlled fuel pump
The automotive electronic control system is basically composed of sensors, electronic controller (ECU), driver and other parts, and the core component is the electronic controller. Works with the mechanical systems on the car (usually integrated with subsystems in the powertrain, chassis and body systems) and transmits information to each other using cables or radio waves, the so-called “mechatronics integration”, such as electronic fuel injection systems, Anti-lock brake control system, anti-skid control system, electronically controlled suspension system, electronically controlled automatic transmission, electronic power steering, etc. 
The electronically controlled ignition device is composed of a microprocessor, a sensor and its interface, and an actuator. The device calculates and judges according to the engine parameters measured by the sensor, and then adjusts the ignition time, so that the engine can work at the best ignition advance angle under different speeds and intake air volumes, so that the engine output can be maximized. Power and torque, reduce fuel consumption and emissions, save fuel and reduce air pollution.
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