DAF CF65, CF75, CF85 Series . Manual — part 416

©

200416

2-5

General

CE ENGINE FUEL SYSTEM

ΧΦ65/75/85 series

4

2

Location of components, production date
 2003-49 (chassis number  0E628656)

1

2

3 4

5

6

7

11

13

17

18

16

10

9

8

i400872

14

15

12

CE ENGINE FUEL SYSTEM

2-6

©

200416

General

2

ΧΦ65/75/85 series

4

1.

Suction pipe to electronic unit cooling plate

2.

Fuel rail pressure sensor

3.

Fuel pipe to fuel rail

4.

Fuel rail

5.

Fuel return overflow valve

6.

Fuel rail pressure-limiting valve

7.

Return pipe from fuel return overflow valve

8.

Fuel pipe to fuel fine filter

9.

High-pressure pump leak-off pipe

10. Fuel pipe to fuel lift pump
11. High-pressure pump
12. Return pipe to fuel tank
13. Fuel pump control solenoid valve
14. Fuel pipe to high-pressure pump
15. Fuel supply pipe
16. Fuel fine filter
17. Fuel pipe from electronic unit cooling plate
18. ECS-DC3 electronic unit

©

200416

2-7

General

CE ENGINE FUEL SYSTEM

ΧΦ65/75/85 series

4

2

2.2 SYSTEM DESCRIPTION, ECS-DC3 FUEL SYSTEM

The fuel lift pump (4a) draws the fuel from the fuel
tank (1) through the cooling plate of the electronic
unit (3).
The purpose of the cooling plate (3) is to ensure
that the electronic unit does not become too hot.
The fuel lift pump (4a) is fitted against the high-
pressure pump (4c) and is driven by the camshaft
gear.
From the fuel lift pump, fuel is forced towards the
fuel fine filter (5).

After the filter, the fuel enters the high-pressure
pump (4c) via the fuel pump control solenoid
valve (4b), which controls the amount of fuel
going to the high-pressure pump. Fuel not taken
in by the high-pressure pump returns via the by-
pass valve (4d) to the fuel lift pump supply pipe
and part of it is used for lubricating the high-
pressure pump.

The high-pressure pump forces the fuel under
high pressure to the fuel rail (6). The fuel rail
distributes the fuel among the injectors (7). The
fuel rail (6) also functions as an accumulator to
ensure that large fluctuations in pressure,
resulting from injector openings and pump
pressure pulses, are prevented as much as
possible.

The pressure in the fuel rail is registered by the
rail pressure sensor (6a). The electronic unit uses
this data to control the high-pressure pump (via
the fuel pump control solenoid valve), so that the
rail pressure can be kept at the desired level. The
desired pressure is not constant, but depends on
the operating conditions.

4

5

6

7

8

7

7

7

7

a

a

b

b

b

a

c

d

7

3

2

1

I400867

U

P

CE ENGINE FUEL SYSTEM

2-8

©

200416

General

2

ΧΦ65/75/85 series

4

A pressure relief valve (6b) is fitted at the end of
the fuel rail. If the pressure in the fuel rail rises too
high (in emergencies only), this valve ensures
that the excess fuel flows back to the return pipe.
The return pipe is connected with the return pipe
to the fuel tank (1).

The electronic unit uses the present rail pressure
to calculate the time during which the injector
needs to be opened in order to obtain the desired
injection quantity.

A pressure relief valve (8) connects the injector
leak-off ducts in the cylinder head with the return
pipe to the fuel tank (1). This pressure relief valve
prevents the fuel from flowing out of the injectors
when the engine has stopped running.

If the system has been "open", the fuel system
can be bled using the primer pump (2a), which
is integrated in the water separator/coarse
filter (2b).

Была ли эта страница вам полезна?
Да!Нет
2 посетителя считают эту страницу полезной.
Большое спасибо!
Ваше мнение очень важно для нас.

Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.

Текст

Политика конфиденциальности