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The dispenser-fuel distributor

The operating principle of the fuel quantity meter

1 - paring disc 2 - Distribution plunger	3 - axis arm 4 - to inlet valves

The principle of operation of the dispenser, fuel distributor

1 - valve spring 2 - Aperture 3 - distribution plunger 4 - slotted sleeve distributor plunger	5 - the lower chamber 6 - the upper chamber 7 - the fuel supply to the injectors 8 - edge distribution management plunger

Dispenser-distributor regulates the amount of fuel supplied to the injectors is proportional amount of air.

Dispenser-distributor comprises fuel pressure regulator distributor plunger valve differential pressure and the control pressure circuit.

Pressure regulator

The pressure regulator controls the fuel pressure in the range of 4.5-5.2 kg / ^cm 2. The excess fuel is returned to the tank through the drain pipe.

When the engine controller reduces the pressure of the fuel pressure in the system to a value somewhat less than 3.3 kg / ^cm 2, i.e. opening pressure nozzles. Thus the possibility of self-ignition of the working mixture.

Distribution plunger

The amount of fuel supplied to the cylinders of the engine varies from zvaichisosti position of a plunger in the walls of which are the rectangular slot orifice which varies as the relative movement of the plunger windows (one window per cylinder) formed in the sleeve of the plunger.

Thus metered fuel (proportional to the flow of air) is fed into the upper chamber of the differential pressure valve.

Differential Pressure Valves

Four differential pressure valve (one per cylinder) have two chambers separated by a diaphragm. Regardless of the amount of fuel supplied, they maintain a constant pressure drop at the slots of the plunger distributor, thereby the fuel pressure in the system and the pressure of fuel supplied to the injectors is maintained at a constant level.

By increasing the fuel supply to the upper chamber pressure increases, the diaphragm flexes downwards, fully opening the supply port to the fuel injectors.

With decreasing fuel supply to the upper chamber diaphragm is deflected upwards, reducing the orifice openings the fuel supply to the injectors.

Contour control pressure

Pressure in the control loop and is regulated by the pressure regulator may vary from 0.5 kg / ^cm 2 and a cold engine to 3.4-3.8 kg / ^cm 2 in a warm engine. At full throttle the control pressure is reduced to 2.9 kg / ^cm 2, causing a leaner mixture at full engine load.

To prevent uncontrolled discharge disk beat meter air flow under the influence of pulsation of air flow (at a low engine speed or full load Engine) provides damping throttle restriction.

The regulator control pressure

The controller provides a control pressure leaner mixture entering the combustion chamber when the engine is warming up. On cold engine bimetallic spring compresses the spring diaphragm valve, opening the fuel discharge passage, which leads to a decrease of resilience at the switch plunger. Reducing the control pressure at a constant air flow causes an increase in the course of the pressure disc. Consequently dispensing plug further rises, increasing the amount of fuel supplied to the injectors.

As the heating of a bimetallic spring pressure on the spring diaphragm regulator valve control pressure is reduced and the discharge channel is slowly closing. Control pressure reaches the normal value and enrichment of fuel mixture is stopped.

Control pressure regulator installed on the cylinder block, so that its temperature varies with the temperature of the engine simultaneously. This eliminates excessive enrichment of the working mixture over medium heat.

The operating principle of the control pressure regulator

A - the engine is cold
B - on the hot engine

1 - bimetallic spring 2 - draining fuel	3 - supply of control pressure 4 - termoobmotka bimetallic spring

Valves with additional air

This valve is used to increase the speed of the crankshaft while the engine warms up. When starting a cold engine supply passage of additional air valve is opened rotary valve, which moves in heating a bimetallic spring. As the warm air supply duct additional gradually overlaps.

In addition, additional air supply regulated pressurized air quantity meter disc, movement of which causes a corresponding rise of the distributor plunger, which also contributes to increase of the engine speed (during closed throttle).

When starting a cold engine electromagnetic launcher nozzle controlled thermal relays, additional sprays fuel into the intake manifold.

Fuel to the starting nozzle of the dispenser is fed directly from the distributor under a pressure of about 4.7 kg / ^cm 2.

The maximum operating time nozzles at -20 ?� C is 8 seconds. When the coolant temperature is above 15 ?� C starting jet is not activated.