Diesel Systems
Modular Common Rail System MCRS
for large diesel engines
Modular Common Rail System MCRS
Pressure sensor
Pressure
limiting
valve
Injector
(1...n)
in large diesel engines. Typical applications for large
high-speed diesel engines are yachts and ferries, cargo
ships, locomotives, mining tårucks and generator sets
Filter
Sensors
Actuators
with an engine power up to 4.4 MW. In order to
guarantee reliable operation even with fuels of low
lubricity, high-pressure pumps and injectors are
EDC
control unit
Tank with
pre-filter
High pressure
The MCRS with the high-pressure pump CP9.1 is the
first fully modular Common Rail System for operation
Inlet metering valve
High-pressure
pump with
integrated
accumulator
Filter
Possible applications
Low pressure circuit
designed to be particularly robust.
Operating principle
The MCRS-specific fuel-storage volumes inside the
Customer benefits
High injection pressure independent
of engine speed
Lower operating noise
Reduced fuel consumption
Adherence to stricter emission limits
Reduced efforts in exhaust gas treatment
Long lifetime
high-pressure pump and inside the injectors minimizes hydraulic pulsations in the high-pressure system,
which enables a simple modular system layout.
This makes it easy to design a modular system even
for a 6-cylinder in-line engine or a 20-cylinder
V-engine. The fuel accumulator inside the injector
ensures a nearly constant pressure during injection
and guarantees maximum flexibility for multiple
injections.
The MCRS opens potentials for the development
Unique in the world, Bosch is the only company to
offer diesel injection systems and components for
applications from the smallest passenger-car engines
to the largest medium-speed heavy fuel oil engines.
Bosch offers injection equipment for large diesel
engines in all regions and to many well-known customers. Large diesel engines are usually defined by a rated
power larger than 560 kW.
Large diesel engines with a displacement of more than
2.5 liters per cylinder can be equipped with a Modular
Common Rail System (MCRS). This system features a
wide range of possible applications and offers all
benefits of Common Rai injection technology.
of fuel-efficient engines. This leads to a significant
competitive advantage for our customers. A pressure
level of 2,200 bar enables to react more flexibly to
upcoming requirements regarding emissions and fuel
consumption.
Diesel Systems | Modular Common Rail System MCRS for large diesel engines
Technical features (application example)
Max. system pressure
2,200 bar
Number of injections
5
Operating voltage
24 V
Control unit
Engine manufacturer
The Bosch MCRS is a Common Rail System in modular
design for large diesel engines which does not require
a separate rail. The electronically controlled and
or Bosch
oil-lubricated CP9.1-type high-pressure inline pump
generates high pressure. Depending on the performance requirements, one or two pumps with integrat-
Lifetime
20,000 h
Fields of application
Ships, locomotives, generators, industry,
mining
Engine power
4,400 kW
Engine speed
2,500 min-1
Max. number of cylinders 20
ed pressure sensors and pressure safety valves can be
used.
The fuel is injected into the combustion chamber by a
CRIN-LE-type injector. Each injector is equipped with
a high-pressure accumulator, a safety flow limiter and
a solenoid valve. The injectors are connected one to
another using short high-pressure lines (also double-
Components of the MCRS
1
System design
walled), therefore MCRS is particularly flexible. Its
3
special design incorporating high-pressure accumulators inside the pump and inside the injector plus short
high-pressure lines minimizes pressure pulsations. This
2
secures constant injection pressure at the nozzle, even
for multiple injections.
The Bosch EDC17CV41 electronic control unit is
suitable for installation close to the engine.
1
CP9.1 high-pressure pump
2
CRIN-LE injector
3
EDC17CV41 electronic control unit
Modular system
The system can easily be adapted to different engine
types on the basis of a modular system: the number
and size of injectors and pump elements is varied
accordingly.
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© Robert Bosch GmbH 2014. All rights reserved, also regarding any disposal, exploitation, reproduction,
editing, distribution, as well as in the event of applications for industrial property rights
Robert Bosch GmbH
Diesel Systems
Postfach 30 02 20
70442 Stuttgart
Germany
diesel@bosch.com
www.bosch-diesel.de
Printed in Germany
292000P1A3-C/CCA-201409-En