Yaroslavl Engine Plant YMZ-536 Operation Manual page 90

CRS BOSCH with an electronic control unit ensures the following:
 precise fuel injection rate for each operation mode as well as
multi-stage injection;
 fuel injection advance angle control depending on the rpm,
load and temperature;
 flexible control of fuel injection pressure over a wide range;
 easy engine start-up with minimum exhaust emissions under
any temperature conditions;
 adjustment of fuel supply depending on the environmental
conditions in order to reduce harmful engine emissions;
 compatibility with the vehicle's electronic systems and
onboard diagnostic and monitoring system through the CAN bus;
ensures diagnostics performs speed limiting and engine emergency
protection functions, as well as cruise-control and redundant control
from the operator's control panel by means of a supplementary
controller.
Fig. 30. Main components of Common Rail System
The fuel system operates as follows (Fig. 30, 31): the fuel from
the fuel tank through the coarse fuel filter and the ECU cooler 12 is
drawn by the priming gear pump 6 and supplied under the pressure of
700...800 kPa (7...8 kgf/cm
high filtering capacity as the Common Rail System is more sensitive
to contamination than systems with a standard plunger-type fuel
pump. Then the fuel enters the high-pressure fuel pump 11 which has
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2
) to the fine fuel filter 1 featuring a very