Table of Contents
Advertisement
When do not need high fuel pressure (deceleration)
The fuel is sent to the high pressure side (hydraulic head) and compressed by the plunger. And, goes into the common
rail through the high pressure pipe.
The IMV installed in the high pressure side (hydraulic head) of HP pump precisely controls the fuel amount and delivers
the rail pressure feedback same as required amount.
The IMV is controlled by ECU.
Performance curve of HP pump
The time required to obtain a sufficient pressure in the rail to enable the engine to start depends on the volume of the
system (definition of the rail, length of the pipes, etc.). The aim is to reach a pressure of 200 bars in 1.5 revolutions (3rd
compression).
• Maximum operating pressure: 1600
FUEL SYSTEM
DI ENG SM - 2004.4
Fuel supply
Transfer pump
High pressure pump
150 bar
±
Engine speed (rpm)
<Pressure curve of HP pump>
IMV close
Venturi
to common rail
to fuel tank
Backleak
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
DI07-21
Y220_07030
Y220_07031
Advertisement
Chapters
Table of Contents
