Solenoid definition and meaning

Solenoids are electromechanical devices that are used to convert electrical energy into mechanical energy. In a car, a solenoid is often used to open and close the valves in the engine. The solenoid is controlled by an electronic control unit (ECU), which sends electrical signals to the solenoid to activate it. When the ECU sends a signal to the solenoid, it creates a magnetic field that interacts with the armature of the solenoid, causing it to move. This movement opens or closes the valve, depending on the type of solenoid. There are two main types of solenoids used in cars: linear solenoids and rotary solenoids. Linear solenoids are used to open and close valves, while rotary solenoids are used to control the timing of the engine.