What are the common actuators of automobile engines?

Fuel injector, igniter, idle speed control valve, cruise control solenoid valve, throttle control motor, EGR valve, intake control valve, secondary air injection valve, activated carbon canister exhaust solenoid valve, oil pump relay, fan relay, air conditioning compressor relay, self-diagnosis display and alarm device, instrument display, etc.

Actuator is an indispensable part of automatic control system. Its function is to accept the control signal sent by the controller, change the size of the controlled medium, and keep the controlled variable at the required value or within a certain range. Actuators can be divided into pneumatic, hydraulic and electric according to their energy forms.

Pneumatic actuator uses compressed air as energy source, which has the characteristics of simple structure, reliable and stable action, large output thrust, convenient maintenance, fire prevention and explosion prevention, and low price. Therefore, it is widely used in chemical industry, paper making, oil refining and other production processes, and it is also convenient to cooperate with passive instruments.

Even if the electric instrument or computer control is used, the pneumatic actuator can still be used as long as the electric signal is converted into a standard air pressure signal of 20- 100kPa by an electro-pneumatic converter or an electro-pneumatic valve positioner.

Electric actuator has the advantages of convenient energy acquisition and rapid signal transmission, but its structure is complex and its explosion-proof performance is poor. Hydraulic actuators are basically not used in chemical industry, oil refining and other production processes, and their characteristics are large output thrust.