Astra HD8Ec Руководство - Страница 4

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ASTRA HD8Ec

Injection phases

Figure 227

1. Fuel valve

2. Pumping element

3. Fuel discharge

4. Filling and flowing back channel

Filling phase

During the filling phase, the pumping element (2) moves to

its upper position.

The highest cam position is passed and the rocker roller gets

closer to the cam basic circle.

The fuel valve (1) is open and the fuel can flow into the

injector from the lower channel (4) of the cylinder head.

The filling phase continues until the pumping element has

reached its upper end-of-stroke position.

SECTION 3

Figure 228

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1. Fuel valve

2. Pumping element

3. Fuel discharge

4. Filling and flowing back channel

Injection phase

The injection phase starts when, during the pumping element

descending phase, the solenoid valve is energized and the fuel

valve (1) closes. Delivery start time, properly processed by

the electronic control unit, depends on engine operating

conditions. Through the rocker, the cam continues to

activate the pumping element (2) and the injection phase

continues as long as the fuel valve is closed (1).

ENGINE - F3B

133

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