Bosch increases injection pressure to 2,500 bar

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Meeting emissions standards such as US 10 and Euro VI is the aim

High specific performance combined with low fuel consumption and low CO2 emissions

Helping to make commercial vehicles and mobile machinery more economical

 

Bosch is increasing the maximum injection pressure of its common-rail injection systems for commercial vehicles to 2,500 bar. Higher injection pressures help lower fuel consumption and emissions. Even a one percent reduction in the fuel consumption of heavy commercial vehicles means a more than one metric ton reduction in annual CO2 emissions per vehicle.

 

CRSN3-25: common-rail injection technology with up to 2,500 bar In its latest variant, the CRSN3-25 injection system for medium and heavy commercial vehicles delivers a maximum injection pressure of 2,500 bar. With its pressure-balanced interior, the innovative injector 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 recirculation and SCR systems, Bosch highpressure injection systems make a significant contribution to reducing fuel consumption and nitrogen oxides. However, the combustion processes that this involves require high injection pressures in order to prevent a rise

in particulate raw emissions. Common-rail systems already deliver high injection pressures in part-load operation, as the system pressure is generated practically independently of engine speed. As a result, commonrail diesel 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 exhaust and fuel consumption levels, and results in even quieter operation. Thanks to a software learning feature, the amount of fuel injected can be adjusted. This makes it possible to meet strict emission standards over the entire vehicle life cycle, even when annual mileage is high. As a result, Bosch is making a significant contribution to meeting the Euro VI emissions standard, which will come into force in 2013, as well as other comparable strict standards, such as US 10 in the United States. The modular CRSN3 injection system is designed for operation with diverse injection pumps depending on customer specifications and needs. It can be used in diesel engines with up to 16 cylinders, as well as in on- and off-highway applications. This covers short and long-haul road travel, as well as construction machinery, tractors, and maritime applications. For heavy duty vehicles, a new generation of the CPN5 high-pressure pump can be applied. In addition 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 kilometers and 15,000 operating hours in off-highway applications. Its service life is thus longer than that of the average vehicle.

Bosch planning to increase pressures and develop additional systems in the future 

Bosch injection systems with even higher injection pressures are currently in the pipeline. The company is also working on additional systems to reduce fuel consumption and emissions. For instance, Bosch has developed CNG injection systems for commercial vehicles as well as the Denoxtronic and Departronic exhaust gas treatment systems. The company is also active in the areas of powertrain hybridization and waste heat recovery systems, which serve to recover energy in the exhaust tract.

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