Fuel Injector; Working Principle - Segway SNARLER ATV 2021 Series Service Manual

ELECTRICAL SYSTEM

Fuel injector

The fuel injector provides fuel to the engine and atomizes
it within a specified time according to the instruction of
the ECU. The fuel injector is installed on the intake pipe,
and the other end is connected to the fuel pipe through
the fuel injector cap (see 【A】 in the fi gure below).
A

Working principle

The ECU sends out electrical pulse signals to the injector
coil to form a magnetic field force. When the magnetic
fi eld force rises enough to overcome the combined force
of the return spring pressure, the gravity of the needle
valve and the friction force, the needle valve begins to
rise and the fuel injection process begins. The maximum
lift of the needle valve does not exceed 0.1mm. When the
fuel injection pulse is cut off, the pressure of the return
spring causes the needle valve to close again.
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