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 fuel high-pressure pump to rail) |
6 | Rail |
7 | Fuel high-pressure lines (from rail to respective fuel injector) |
8 | Pressure limiting valve |
9 | Fuel return lines of fuel injectors |
10 | Fuel return line from pressure limiting valve |
B602 | Fuel temperature sensor |
B622 | Rail pressure sensor |
B625 | Fuel pressure sensor (outlet) (with engine version Euro VI Standard only) |
B626 | Fuel pressure sensor (inlet) (with engine version Euro VI Standard only) |
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 (with engine version Euro VI Standard only) |
Y629 | Fuel shutoff valve (with engine version Euro VI Standard only) |
Y642 | Quantity control valve |
A | Fuel feed lines on intake side |
B | Fuel feed lines on pressure side |
C | Fuel high-pressure lines |
D | Fuel return lines |
W07.16-1208-76
General
Increasingly more stringent emissions regulations as well as increasing customer requirements in terms of fuel consumption, overall economy, and environmental protection are necessitating a completely new fuel injection system.
The "amplified pressure common rail system (APCRS)" is the first common rail system that minimizes the quantity of fuel required for combustion.
This is achieved using a low-pressure fuel circuit and a high-pressure fuel circuit. The low-pressure fuel circuit guarantees that the fuel is cleaned, and is available in sufficient quantity and with sufficient pressure to the high-pressure fuel circuit. The high-pressure fuel circuit guarantees that a sufficient quantity of the fuel provided by the low-pressure fuel circuit is injected at the right point in time and with the required pressure into the cylinders.
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)
Fuel feed lines on intake side (A)
Fuel feed lines on pressure side (B)
Fuel return lines (D) via which the diverted quantity for the solenoid valves at the nozzle needles and the diverted quantity for the solenoid valves at the pressure converters return to the low-pressure fuel circuit
Fuel temperature sensor (B602)
Fuel filter module pressure sensor (B638)
The following component parts are added with the engine version Euro VI Standard:
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) that delivers the fuel into the rail (6) and compresses it to approx. 900 bar
Rail (6)
Pressure limiting valve (8) that is closed during normal operation and only opens when 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)