Analysis

Motronic For Gasoline Direct Injection

13th September 2011
ES Admin
In the future, Bosch Motronic gasoline direct injection will continue to be the basis for spark-ignition engines that are cleaner and even more fuel-efficient. Thanks to an improved air-fuel mix, it can reduce fuel consumption, which in turn cuts CO2 emissions. In combination with downsizing concepts, it has the potential to reduce consumption by roughly 30 percent. At the same time, it reduces hydrocarbons (HC) and nitrogen oxides (NOx). Motronic allows vehicles to comply with the emissions levels prescribed by the world's strictest standards, i.e. the SULEV (super ultra low emission vehicle) legislation in the U.S. Since a growing number of automakers are beginning series production of engines with direct injections, the market for these systems is continually growing. “We expect that the worldwide share of gasoline direct injection for vehicles with spark-ignition engines will double, from 13 percent today to 28 percent in 2015. Especially in the U.S. and China, a growing number of carmakers are opting for direct injection, says Dr. Rolf Bulander, president of the Bosch Gasoline Systems division. Bosch is well prepared to respond to growing demand in global markets, as the company has several manufacturing sites outside Europe. In addition to Bamberg and Nuremberg (Germany), as well as Bursa (Turkey), the division manufactures components for direct injection in Charleston (U.S.), San Luis Potosi (Mexico), Wuxi (China), and Gunpo (Korea).
The HDEV5 high-pressure injection valve and the HDP5 high-pressure pump
Motronic for direct injection comprises a high-pressure pump, high-pressure rail with injection valve, and engine control unit. If mixture formation is homogeneous, the HDEV5 high-pressure injection valve makes a major contribution to optimum, and thus fuel efficient combustion. Up to seven individually positioned injection holes enable the spray pattern to be adapted flexibly to different combustion chambers. The high-pressure injection valve and the high-pressure pump are designed for system pressures up to 200 bar. The demand-controlled HDP5 high-pressure pump is characterised by its compact dimensions and its light weight of 780 grams. Thanks to the use of stainless steel, the current components of the gasoline direct injection system can handle ethanol blends as well as fuels of varying quality, and are thus designed for worldwide use.

Downsizing engines with turbochargers

In combination with turbocharging, gasoline direct injection allows internal-combustion engines to be downsized. In downsized engines, lower displacement and fewer cylinders mean lower friction losses, and thus lower consumption. Moreover, this is achieved without sacrificing torque and performance. Bosch will be manufacturing modern turbocharging systems for these new engine designs from late 2011, in its Bosch Mahle Turbo Systems joint venture.

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