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Workshop Manual, TPD 1353E, Issue 3
Peregrine EDi and 1300 Series EDi
Phase 1: Injection
An electrical pulse from the engine control module energises the solenoid (A1). The armature (A2) of the
solenoid pulls the valve (A3) against the pressure of the spring (A6), to close the outlet port (A5), and to open
the inlet port (A7). This allows engine oil at injection control pressure to enter the oil chamber (A4).
The oil pressure above the piston is now greater than the total pressure of the spring (A9) and the fuel below
the piston (A8), this causes the piston to move down into the fuel chamber (A10).
Note: The surface area of the top of the piston is six or seven times greater than the surface area of the bottom
of the piston. This difference gives a mechanical advantage. The mechanical advantage is 6:1 for WK, WL,
WP and WQ engines, and is 7:1 for WM, WN, WR and WS engines. An increase of pressure in the oil chamber
causes an increase of pressure in the fuel chamber that is six or seven times greater.
As the piston moves down into the fuel chamber, the pressure of the fuel below the piston increases. When
this pressure is greater than the supply pressure (B3), the ball-valve (B4) in the fuel chamber closes. This
prevents the entry of more fuel into the chamber.
When the ball-valve closes, the pressure in the fuel chamber rises rapidly and the flat valve (B5) opens to allow
the high-pressure fuel into the nozzle (B6) of the injector unit.
As the piston continues to move down, more oil enters the oil chamber and the pressure in the fuel chamber
continues to increase. When the fuel reaches injection pressure, the nozzle needle (B2) is pushed up from its
seat, against the pressure of the spring (B1), and injection begins.
The period of injection is controlled by the engine control module.
1
2
4
A
PW239
5
6
7
3
10
9
8
2
1
B
PW240
6
5
4
3
This document has been printed from SPI². Not for Resale
Содержание 1300 EDi Series
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