What is the principle of engine vacuum?

[JakeMarie]

Engine vacuum principle involves the generation of vacuum by a vacuum pump for the brake booster and for controlling the exhaust gas bypass valve. The recirculation air pressure relief valve also obtains vacuum through an electric switching valve (EUV). The vacuum pump mainly consists of components such as the pump body, rotor, vanes, and intake and exhaust ports. It refers to a device or equipment that uses mechanical, physical, chemical, or physicochemical methods to evacuate the container to obtain vacuum. Engine vacuum plays a role in the braking system by providing brake assistance; in the air conditioning system, it controls the air conditioning flaps; connected to the engine's vacuum pressure sensor, it provides vacuum level signals to the sensor.