a. The injector is equivalent to a solenoid valve.
b. When the power is turned on, the electromagnetic coil generates electromagnetic force, the armature and the needle valve are sucked up, the fuel injector is opened, and the gasoline is sprayed into the intake port or intake pipe through the nozzle hole.
c. When the power is off, the electromagnetic force disappears, the armature and needle valve close the nozzle hole under the action of the return spring, and the injector stops injecting fuel.
d. The power-on and power-off of the injector is controlled by the electronic control unit with electric pulses.
e. The fuel injection quantity is determined by the electric pulse width. Pulse width = fuel injection duration = fuel injection amount.
f. Generally, the needle valve lift is about 0.1mm, and the fuel injection duration is in the range of 2~10ms.
