Shown on engine 471.9 engine version Euro VI Standard |
1 | Water separator |
2 | Fuel prefilter |
3 | Fuel filter |
4 | Fuel system high pressure pump |
5 | Fuel high-pressure lines (from the fuel high-pressure pump to the rail) |
6 | Rail |
7 | Fuel high-pressure lines (from rail to respective fuel injector) |
8 | Pressure limiting valve |
9 | Fuel return lines of the fuel injectors |
10 | Fuel return line from pressure limiting valve |
B602 | Fuel temperature sensor |
B622 | Rail pressure sensor |
B625 | Fuel pressure sensor (outlet) (only for engine version Euro VI Standard) |
B626 | Fuel pressure sensor (inlet) (only for engine version Euro VI Standard) |
B638 | Fuel filter module pressure sensor |
Y608 | Cylinder 1 fuel injector |
Y609 | Cylinder 2 fuel injector |
Y610 | Cylinder 3 fuel injector |
Y611 | Cylinder 4 fuel injector |
Y612 | Cylinder 5 fuel injector |
Y613 | Cylinder 6 fuel injector |
Y628 | Fuel metering valve (only for engine version Euro VI Standard) |
Y629 | Fuel shutoff valve (only for engine version Euro VI Standard) |
Y642 | Quantity control valve |
A | Intake side fuel feed lines |
B | Thrust side fuel feed lines |
C | Fuel high-pressure lines |
D | Fuel return lines |
W07.16-1208-76
General
The emission regulations, which are becoming increasingly strict, and the increasing customer demand with regard to fuel consumption, overall profitability, and also environmental protection require a completely new fuel injection system.
The "Amplified Pressure Common Rail System (APCRS)" is the first Common Rail System to be used that minimizes the fuel quantity required for combustion.
This is achieved through a low-pressure fuel circuit and a high-pressure fuel circuit. The low-pressure fuel circuit ensures that the fuel is cleaned and provided to the high-pressure fuel circuit in the sufficient amount and with sufficient pressure. The high-pressure fuel circuit guarantees that the fuel provided by the low-pressure fuel circuit is injected in the cylinders with the required pressure and in a sufficient amount.
Fuel low-pressure circuit
The fuel low-pressure circuit essentially consists of the following components:
Fuel tank
Fuel filter module with water separator (1), fuel prefilter (2) and fuel filter (3), in which the fuel is cleaned in several stages
Fuel pump which is located at the fuel system high pressure pump (4)
Intake side fuel feed lines (A)
Thrust side fuel feed lines (B)
Fuel return lines (D), through which the diverted quantity of the solenoid valves at the nozzle needles and the diverted quantity of the solenoid valves at the pressure converters are returned to the low-pressure fuel circuit
Fuel temperature sensor (B602)
Fuel filter module pressure sensor (B638)
For engine version Euro VI Standard, the following component parts are added:
Fuel pressure sensor (outlet) (B625)
Fuel pressure sensor (inlet) (B626)
Fuel metering valve (Y628)
Fuel shutoff valve (Y629)
Fuel high-pressure circuit
The fuel high-pressure circuit of the APCRS consists of the following components:
Fuel high-pressure pump (4), which delivers fuel into the rail (6) and compresses it to about 900 bar
Rail (6)
Pressure limiting valve (8), which is closed in normal operation and opens only if the maximum fuel pressure of 1,100 bar in the rail is exceeded (limp home mode)
Rail pressure sensor (B622)
Cylinder 1 fuel injector (Y608)
Cylinder 2 fuel injector (Y609)
Cylinder 3 fuel injector (Y610)
Cylinder 4 fuel injector (Y611)
Cylinder 5 fuel injector (Y612)
Cylinder 6 fuel injector (Y613)
Quantity control valve (Y642)
Fuel high-pressure lines (C)