Automotive technology

Higher efficiency for diesel engines in commercial vehicles Bosch common-rail systems reduce operating cost, consumption, and emissions

  • CRSN3 and CRSN4 deliver 2500-bar injection pressure; series production to begin in 2012
  • Focus on future emission standards such as Euro VI and US 10
  • High specific power and low consumption
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  • September 21, 2010
  • Automotive technology
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press release

Rising fuel prices and increasingly strict emission standards worldwide mean that commercial vehicles will need economical and environmentally friendly diesel engines. Bosch common-rail systems reduce fuel consumption and CO2 emissions, thus cutting operating costs. Reducing consumption by just 1 percent in a heavy commercial vehicle that covers 200,000 kilometers per year, for example, means annual savings of some 800 euros. When combined with SCR catalytic converters, Bosch common-rail systems also make it much easier to meet both current and future emission standards, such as Euro VI, US10, JPNLT, and even Tier 4 Final. They are also the basis for quiet diesel engines that have high specific power at the low engine speeds that are typical for commercial vehicles. Each Bosch common-rail system consists of a high-pressure pump, a high-pressure rail, one injector per cylinder, and an electronic control unit with actuators and sensors. EDC electronic diesel control can both regulate the entire injection process and control the boost pressure, exhaust-gas recirculation, and exhaust-gas treatment systems.

CRSN3 and CRSN4 for medium and heavy commercial vehicles
For medium to heavy commercial vehicles, Bosch refined the CRSN3 common-rail system in conjunction with the CRIN3 solenoid-valve injector. The CRSN3 is designed for on- and off-highway driving and diesel engines with up to 16 cylinders. The common-rail system, which delivers 1800 bar and has been in series production since 2005, is now being expanded, with two new variants that can deliver higher system pressures. The first set of variants consists of the CRSN3-20, to deliver 2000 bar for medium commercial vehicles, and the CRSN3-22, to deliver 2200 bar for heavy commercial vehicles. Despite the higher system pressures, the drive power necessary for the high-pressure pump is the same or even lower than that for the 1800-bar system. That means higher system efficiency. Customers benefit from the high torque at low engine speeds and, simultaneously, from the lower fuel consumption and thus reduced CO2 emissions. The next stage of series production is planned for the CRSN3-25 in 2012. It will deliver 2500 bar.

The CRSN4-21 system is designed for heavy commercial vehicles. Its injector uses hydraulic pressure amplification to generate a maximum injection pressure of 2100 bar. Since higher injection pressures mean even lower consumption and thus reduced CO2 emissions, the CRIN4-25 injector will be configured next for pressures of 2500 bar. Series production is planned to start in early 2012. Because the injection process can be configured flexibly, the system offers customers special liberties in designing engines, meaning that they can meet emission standards such as Euro VI or US 10 through low consumption, while still achieving the best possible power output and keeping combustion noise low.

CRS2 series with solenoid valve for light utility vehicles
The CRS2 common-rail system series was also refined for light commercial vehicles with diesel engines having up to six cylinders and three liters of engine displacement. The CRS2-18, with an injection pressure of 1800 bar, and the CRS 2-20, with an injection pressure of 2000 bar, build on the CRS2-16, which has proved its worth many times over in passenger cars. The powerful injectors of this series offer engine developers a high level of freedom in designing injection procedures. Up to eight separate injections are possible within a very short time during each combustion cycle. Multiple injection lowers fuel consumption, CO2 emissions, powertrain noise, and pollutant emissions. The system's start-stop feature is yet another customer benefit, particularly for light commercial vehicles in urban delivery traffic.

The Bosch Group is a leading global supplier of technology and services. In 2013, its roughly 281,000 associates generated sales of 46.1 billion euros. (NB: Due to a change in accounting policies, the 2013 figures can only be compared to a limited extent with the 2012 figures). Its operations are divided into four business sectors: Automotive Technology, Industrial Technology, Consumer Goods, and Energy and Building Technology. The Bosch Group comprises Robert Bosch GmbH and its roughly 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 2013, the Bosch Group invested some 4.5 billion euros in research and development and applied for some 5,000 patents. This is an average of 20 patents per day. The Bosch Group’s products and services are designed to fascinate, and to improve the quality of life by providing solutions which are both innovative and beneficial. In this way, the company offers technology worldwide that is “Invented for life.”

The company was set up in Stuttgart in 1886 by Robert Bosch (1861-1942) as “Workshop for Precision Mechanics and Electrical Engineering.” The special ownership structure of Robert Bosch GmbH guarantees the entrepreneurial freedom of the Bosch Group, making it possible for the company to plan over the long term and to undertake significant up-front investments in the safeguarding of its future. 92 percent of the share capital of Robert Bosch GmbH is held by Robert Bosch Stiftung GmbH, a charitable foundation. The majority of voting rights are held by Robert Bosch Industrietreuhand KG, an industrial trust. The entrepreneurial ownership functions are carried out by the trust. The remaining shares are held by the Bosch family and by Robert Bosch GmbH.

Additional information is available online at www.bosch.com and www.bosch-press.com, http://twitter.com/BoschPresse.

PI7052 - September 21, 2010

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