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MOTORINDIA
l
September 2012
Bosch’
new injection system to
cut CV fuel use, emissions
Bosch is increasing the maximum
injection pressure of its common-
rail injection systems for commer-
cial vehicles to 2,500 bar. Higher
injection pressures means lower fuel
consumption and emissions. Even a
one per cent reduction in fuel con-
sumption of heavy commercial ve-
hicles means a more than one metric
ton reduction in annual CO
2
emis-
sions per vehicle.
In its latest variant, the CRSN3-
25 injection system for medium and
heavy commercial vehicles deliv-
ers a maximum injection pressure
of 2,500 bar. With its pressure-bal-
anced interior, the innovative in-
jector concept offers an especially
high level of hydraulic efficiency.
Since its exterior geometry remains
unchanged, the injector used in the
CRSN3-25 is compatible with its
predecessor system.
Another advantage of the new
system is an improved diagnostic
capability. Thanks to an integrated
pressure limiter, a comprehensive
system check can be carried out
when the vehicle is being serviced.
Combined with exhaust gas recir-
culation and SCR systems, Bosch
high-pressure injection systems
make a significant contribution to
reducing fuel consumption and ni-
trogen oxides. However, the com-
bustion processes that this involves
require high injection pressures in
order to prevent a rise in particulate
raw emissions. Common-rail sys-
tems already deliver high injection
pressures in part-load operation,
as the system pressure is generated
practically independently of engine
speed. As a result, common-rail die-
sel engines have high torque even at
low rpm.
With the CRSN3-25, up to seven
individual injections are possible.
This increases flexibility in terms of
engine design, promotes lower ex-
haust and fuel consumption levels,
and results in even quieter opera-
tion. Thanks to a software learning
feature, the amount of fuel injected
can be adjusted. This makes it possi-
ble to meet strict emission standards
over the entire vehicle life cycle,
even when annual mileage is high.
As a result, Bosch is making a sig-
nificant contribution to meeting the
Euro VI emissions standard, which
component zone
Bosch injection systems with even
higher injection pressures are cur-
rently in the pipeline. The company is
also working on additional systems
to reduce fuel consumption and emis-
sions. For instance, it has developed
CNG injection systems for commercial
vehicles as well as the Denoxtronic
and Departronic exhaust gas treat-
ment systems. It is also active in the
areas of powertrain hybridization
and waste heat recovery systems that
serve to recover energy in the exhaust
tract.
will come into force in 2013, as well
as other comparable strict standards,
such as US 10 in the US.
For heavy duty vehicles, a new
generation of the CPN5 high-pres-
sure pump can be applied. In addi-
tion to generating pressures of up to
2,500 bar, it is especially compact,
robust, and lightweight. The pump
has a service life of 1.6 million km
and 15,000 operating hours in off-
highway applications. Its service
life is thus longer than that of the
average vehicle.
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