KE-Jetronic fuel injection system. Free Technical Library article

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Fuel injection system "KE-JETRONIC"

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Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic fuel injection

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The system includes an electric fuel pump, a fuel accumulator, a fuel filter, a fuel pressure regulator in the system, a fuel dispenser, an electro-hydraulic control pressure regulator, an injector and a starting nozzle, a Hall sensor, a throttle position switch, an auxiliary air supply valve, a temperature sensor coolant, thermal relay, pressure plate potentiometer, electronic control unit. The fuel injection system works as follows. The electric pump provides fuel supply from the fuel tank to the dispenser-distributor of the injection system through the accumulator and the fuel filter. In the dispenser-distributor, fuel enters the upper chambers of the differential valves under pressure, which, in turn, depending on the position of the distributor plunger, is adjusted by the fuel pressure regulator. The amount of fuel required for the preparation of the fuel mixture and supplied to the injectors is controlled by the diaphragm of the differential valves, which is pressed against the control pressure.

The fuel pressure in the system is determined by the appropriate regulator, which sets the pressure range in the system and regulates the differential pressure. The control pressure regulator is an electrovalve, which is controlled, in turn, by an electronic control unit. The regulator includes a bimetallic plate, the position of which determines the supply of fuel to the regulator. With an increase in engine speed, the fuel supply to the regulator is limited, and with a decrease in speed, it increases.

Based on the signals from the sensors, the electronic control unit “calculates” the engine operating mode and controls the control pressure regulator valve. The auxiliary air supply valve is controlled by the electronic control unit and operates during cold start and engine warm-up. In starting modes, depending on the temperature of the coolant, the starting injector sprays fuel into the intake tract and provides enrichment of the fuel mixture for reliable engine start. To ensure more rational fuel dosing, an oxygen content sensor in the exhaust gases (lambda probe) can be included in the control system.

On fig. 1 is a block diagram of a fuel injection control system.

Fig. 1

1. Fuel tank
2. Fuel pump
3. Fuel storage
4. Fuel filter
5. Fuel pressure regulator
6. Injector
7. Starting nozzle
8. Fuel dispenser
9. Lambda probe
10. Engine temperature sensor
11. Thermal relay
12. Ignition distributor
13. Additional air valve
14. Throttle sensor
15. Air flow meter
16. Engine
17. Control relay
18. Electric control unit
19. Egnition lock
20. Battery

Publication: cxem.net

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