Sonata V6-3.0L (1991)
Fuel Injector: Description and Operation
Fuel Injection System
The Fuel Injection Control System consists of the ECU, all of the engine condition and operating condition sensors, and the injectors. The ECU uses the
information from the sensors to determine the proper amount of fuel and the proper time of delivery. The ECU controls the operation of the injectors to
deliver fuel in the right amount and at the right time.
Injector
The injectors are solenoid operated valves, installed in the intake manifold. When the solenoid coil is energized, the plunger is attracted. The needle
valve that is attached to the plunger is therefore pulled to the full open position and fuel is injected through the valve. When the solenoid is de-energized
spring pressure closes the valve. Since the injection nozzle opening is a fixed size and the fuel pressure is also fixed, the injection amount is determined
by the duration which the needle valve is open.
