· CRS5.1 with up to 2200 bar injection pressure

· Fuel consumption of diesel engines to be further cut through downsizing

· Diesel technology for less than 99 grams of CO2 emissions per kilometer

In modern diesel engines, Bosch diesel injection systems make a significant contribution to reducing fuel consumption as well as CO2 emissions. Modern direct-injection diesel engines with common-rail systems consume a good 30 percent less fuel and emit around 25 percent less CO2 than comparable gasoline engines. Moreover, when Euro 5 emissions standards come into effect in September 2009, the NOx emissions of cars with diesel engines will be some 96 percent lower than when the emissions standards were first introduced. The same can be said for particulate emissions, which have been cut by 98 percent during the same period. In continuing to push the development of the common-rail system forward, Bosch is ensuring that diesel engines will meet the increasingly strict emissions regulations of the future. At the same time, the company is improving the performance of the diesel engine and making it more efficient.

Fast switching solenoid valve injectors
Thanks to its modular concept, the CRS2.5 common-rail system is well-suited to a wide range of engines from three to eight cylinders. As part of CRS2.5, the electronically controlled CP4 high-pressure injection pump can generate injection pressure of up to 1800 bar. For the first time, the modified solenoid valve injectors have been equipped with a pressure-balanced valve, which allows for more single injections within a shorter timeframe. Moreover, advanced injection reduces combustion noise and NOx emissions, and post-injection reduces soot emissions. As a result, solenoid valves perform just as well as piezo valves. For some applications, CRS2.5 can already be designed to meet the Euro 6 emission standard, which will come into effect in 2014.

CRS5.1 with piezo inline injectors
The technically more complex CRS5.1 common-rail system is designed for engines with very high specific power of more than 75 kilowatts per liter of displacement. For Euro 6-compliant combustion processes, this system will be equipped with the CP4 high-pressure pump. For the first time in passenger cars, the pump will inject fuel at a pressure of 2200 bar. Moreover, piezo inline injectors have been further improved with regard to their multiple-injection capability and their hydraulic efficiency. Under higher pressure, the diesel fuel can be better atomized in the combustion chamber. This reduces emissions and combustion noises as well as fuel consumption and CO2 emissions.

Common-rail systems support downsizing concepts
All Bosch's current common-rail systems can be combined with eco-friendly features such as the start-stop function. What is more, the systems support the development of new engine concepts such as downsizing. This means that the engine displacement or the number of cylinders is reduced in order to cut fuel consumption and CO2 emissions. Thanks to the currently common combination of common-rail systems with turbocharging, the specific power of smaller diesel engines can be maintained. As a result, drivers can benefit from even greater fuel efficiency and even lower CO2 emissions without having to compromise on performance. Bosch sees further potential to make diesel engines even more fuel efficient, and believes that consumption can be reduced by up to a third. This will turn a mid-range diesel into a car with fuel economy of three liters per 100 kilometers and carbon emissions of less than 99 grams per kilometer.

The Bosch Group is a leading global supplier of technology and services. In the areas of automotive and industrial technology, consumer goods, and building technology, some 275,000 associates generated sales of 38.2 billion euros in fiscal 2009. The Bosch Group comprises Robert Bosch GmbH and its more than 300 subsidiaries and regional companies in over 60 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 growth. Each year, Bosch spends more than 3.5 billion euros for research and development, and applies for some 3,800 patents worldwide. With all its products and services, Bosch enhances the quality of life by providing solutions which are both innovative and beneficial. 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. Ninety-two 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 can be accessed at www.bosch.com.

PI6750 - August 2009