SQR480EC electric fuel injection system
I. System description
Electric fuel injection system is a complete functions system and mainly consists of fuel
system, air system and electric control system. It also includes ignition control and
exhaust control functions etc.
Fuel system
Fuel passes through fuel tank built-in oil pump to fuel filter, and is pressed to oil rail after
filtering, then sprayed into cylinder via fuel injector, and then returns to fuel tank through fuel
pressure adjuster, which can maintain constant fuel pressure. Fuel injector locates at the air
intake port of each cylinder and spray fuel into cylinder.
Air system
Air system includes air intake system air cleaner, air pressure sensor, temperature sensor,
throttle valve body, air intake hose and manifold, and idle adjuster valve and idle adjuster
screw for idle adjusting.
Electric Control System
Consists of sensor, ECU and actuator, including ECU, air intake temperature and pressure
sensor, water temperature sensor, throttle valve position sensor, oxygen sensor, electric oil
pump, fuel injector, ignition coi land throttle valve body etc.
13 Oil pressure adjuster
14 Oxygen sensor
15 3-way catalyst converter
Engine coolant temperature sensor (water
temperature sensor)
17 Crankshaft position RPM sensor
18 ECU
19 Battery
20 Electric fuel injector
21 Pressure switch
22 Ignition switch
23 A/C compressor
1 Fuel Vapor Tank (carbon canister)
Oil pump
Fuel tank
Engine
Fuel rail
Air Intake Temperature And Pressure Sensor
Air cleaner
Idle step motor
Throttle position sensor
Throttle valve body
Spark Plug 12 Ignition coil
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