CAC Gasoline Engine Maintenance And Servicing Manual
78
1. fuel tank 2. fuel pump 3. fuel
filter
4. check valve 5. fuel pressure regulator 6. fuel
injector
7. air filter 8. fuel vapor connecting pipe 9.engine idle
speed
actuator
10. absolute pressure sensor 11. injection/ignition system ECU
12. throttle valve position sensor 13. water sensor 14. intake temperature
sensor
15. injection/ignition system dual relay 16. ignition coil
17. tacho / TDC sensor 18. spark plug 19. CHECK-UP1
diagnostic port
20. fuel vapor recirculation solenoid 21. λsensor
22. tachometer 23. IAW system warning indicator
Two. Operation principle:
Single Port Injection System is applied on the vehicle equipped with 3 way catalyst converter .the
system insures air/fuel mixture ratio in the vicinity of the ideal air/fuel ratio.
The ideal air/fuel ratio is important for catalyst converter to work normally. The aim having the catalyst
converter installed is to reduce harmful exhaust emission. Theλsensor, analyzing oxygen content in exhaust
gas continuously , may ensure getting ideal mixture . If air/fuel ration is not ideal, ECU may adjust the mixture
consistence continuously by measuring fuel intake in progression.
Fuel system(fuel pump, fuel filter, pressure regulator) offers the fuel of 1 bar to fuel injector.
The fuel Injection value is proportional to the air sucked into the engine . also the fuel is injected into
intake manifold synchronously with TDC . under some specified condition , the amount of fuel needed for
engine circulation is too small to measure, the system may perform a asynchronous injection ( inject once
instead of the normal injection ever several TDCs ).
Ignition controller with inductive discharging is of electrostatic discharge type(distributorless). Ignition
Fig. 134 single port injection system
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