· Downsizing concepts reduce fuel consumption and emissions

· Potential for future emissions regulations

The current generation of Bosch gasoline direct injection is the basis for gasoline engines that are cleaner and even more fuel-efficient. Thanks to an improved air-fuel mix, DI-Motronic can reduce fuel consumption further, which in turn cuts CO2 emissions. At the same time, it reduces hydrocarbons (HC) and nitrogen oxides (NOx). As a result, the DI-Motronic can reduce emissions to levels lower than those prescribed by the world's strictest standards, i.e. the SULEV (super ultra low emission vehicle) legislation in the U.S. Particularly when combined with downsizing concepts, DI-Motronic has the potential to meet the emissions standards of the future and to reduce fuel consumption even further.

Some 15 percent less fuel consumption
Even though just under two-thirds of all cars sold worldwide today have a gasoline engine with intake manifold injection, gasoline direct injection is gaining importance. By offering Bosch DI-Motronic direct injection in high-volume vehicle models, a number of automakers already have a technological advantage. In Europe, these include the Volkwagen Group and BMW Mini in cooperation with Peugeot. In the U.S., Ford offers DI-Motronic as part of its “EcoBoost” program for six-cylinder engines. Bosch expects the share of gasoline direction injection to triple by 2016, to 16 percent of all vehicles manufactured worldwide. The technology is gaining popularity, especially in western Europe, North America, Japan, and Korea. One reason is that the combination of gasoline direct injection and turbocharging makes smaller engines possible.

When it comes to gasoline engines, the automotive industry’s prime focus at present is on downsizing concepts, where the engine displacement, or frequently also the number of cylinders, is reduced in order to cut fuel consumption and CO2 emissions. Variable valve systems and exhaust-gas turbocharging increase torque at low engine speeds. Thus, despite the smaller engine size, there is no negative effect on power. Downsizing calls for direct injection systems, such as the Bosch DI-Motronic, in combination with turbocharging. These downsized gasoline engines have resulted in a good 15 percent reduction in fuel consumption and CO2 emissions as compared with engines with manifold injection systems.

Solenoid valves for homogeneous mixture formation
DI-Motronicis ideal for lean-burn engines with stratified charge, as well as for homogeneous charge compression ignition. When it comes to homogeneous mixture formation, DI-Motronic’s HDEV5 magnetically controlled high-pressure injection valve makes a major contribution to optimum, and thus fuel-efficient, combustion. Depending on the application, this injector enables a spraying pattern with up to seven individual jets and injection pressure of up to 200 bar. The DI-Motronic’s core elements also include the HDP5 high-pressure pump, which is compact and lightweight. All the components of the fuel delivery system are made of stainless steel, making it possible for the system to handle the very different types and qualities of fuel available around the world. The HDEV4 piezo injector is well-suited to spray-guided lean-combustion processes. With injection pressures of up to 200 bar, it enables especially fast multiple injections. This innovative system was first installed in 2006, in the Mercedes CLS 350 CGI.

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.

PI6747 - August 2009