What is the working principle of automotive components (solenoid valve components)
Automotive solenoid valves are the core executive components of automotive electronic control systems. Their working principle is based on electromagnetic effects, converting electrical signal commands into mechanical actions to achieve correct control of the on/off, flow direction, and flow rate of fluid media such as oil, gas, and water.
Automotive solenoid valves are the core executive components of automotive electronic control systems. Their working principle is based on electromagnetic effects, converting electrical signal commands into mechanical actions to achieve correct control of the on/off, flow direction, and flow rate of fluid media such as oil, gas, and water.
1、 Core working principle (official statement)
The solenoid valve is composed of an electromagnetic coil, a valve core (moving iron core), a reset spring, a valve body, etc.
Power on action: When the vehicle's electronic control unit (ECU) outputs control current to the electromagnetic coil, the coil generates a magnetic field, driving the ferromagnetic valve core to overcome the elastic force of the reset spring and the pressure of the medium, producing axial displacement, changing the on/off state of the internal flow channel of the valve body, and achieving valve opening or switching.
Power off reset: After the control current is cut off, the magnetic field disappears, and the valve core quickly resets under the elastic force of the reset spring. The flow channel returns to its initial state (normally closed/normally open), and the valve closes or switches back to its original path.
Control logic: Based on ECU instructions, switch type (fully open/fully closed) or pulse type (duty cycle adjustment opening) control can be implemented to adapt to the dynamic adjustment requirements of different systems.
2、 Mainstream type principle (official specification)
Direct acting solenoid valve: The electromagnetic force directly drives the valve core to move, with a simple structure and rapid response, suitable for low-pressure and low flow scenarios.
Pilot operated solenoid valve: The pilot valve is first opened by electromagnetic force, and the main valve core is driven by the pressure difference of the medium. It is suitable for high-pressure and high flow conditions.
Step by step direct action: Combining direct action and pilot principles, balancing low-pressure direct start and high-pressure high flow control capabilities.
3、 System control logic
As the execution terminal, the solenoid valve works in conjunction with various sensors (pressure, temperature, speed, etc.): the sensors collect real-time operating parameters and provide feedback to the ECU. After calculation, the ECU outputs control signals to drive the solenoid valve, achieving automation and correct control of engine fuel injection, transmission shifting, braking system, carbon canister purification, cooling cycle and other systems.
Home
Product
Wechat
Telephone