Mobility Solutions

Common-rail systems for economical and clean
diesel engines in commercial vehicles
Bosch increases injection pressure to 2,500 bar

  • 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
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  • August 06, 2012
  • Mobility Solutions
  • Press releases
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press release

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 high-pressure 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 highinjection pressures in part-load operation, as the system pressure is generated practically independently of engine speed. As a result, common-rail 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.

Common Rail System for light commercial vehicles – CRSN3-25 (YouTube) (Download)

Click here to find further information.

Mobility Solutions is the largest Bosch Group business sector. According to preliminary figures, its 2014 sales came to 33.3 billion euros, or 68 percent of total group sales. This makes the Bosch Group one of the leading automotive suppliers. Mobility Solutions largely operates in the following areas: injection technology for internal-combustion engines, alternative powertrain concepts, efficient and networked powertrain peripherals, systems for active and passive driving safety, assistance and comfort functions, technology for user-friendly infotainment as well as car-to-car and Car2X communication, and concepts, technology, and service for the automotive aftermarket. Bosch has been responsible for important automotive innovations, such as electronic engine management, the ESP anti-skid system, and common-rail diesel technology.

The Bosch Group is a leading global supplier of technology and services. According to preliminary figures, its roughly 290,000 associates generated sales of 48.9 billion euros in 2014. Its operations are divided into four business sectors: Mobility Solutions, Industrial Technology, Consumer Goods, and Energy and Building Technology. The Bosch Group comprises Robert Bosch GmbH and its more than 360 subsidiaries and regional companies in some 50 countries. If its sales and service partners are included, then Bosch is represented in roughly 150 countries. This worldwide development, manufacturing, and sales network is the foundation for further growth. In 2014, Bosch applied for some 4,600 patents worldwide. The Bosch Group’s strategic goal is to deliver innovations for connected life. Bosch improves quality of life worldwide with products and services that are innovative and spark enthusiasm. In short, Bosch creates technology that is “Invented for life.”

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PI7761 - August 06, 2012

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