|Demonstrator platform for the turbo DI BOOST engine.|
Robert Bosch Corporation and Ricardo plc are jointly developing an advanced turbo-charged, direct injection gasoline engine system. The prototype system, DI BOOST, will offer superior performance and fuel economy while also being capable of achieving super ultra low emission vehicle (SULEV) standards.
Two prototype DI BOOST engines are in development and combine the performance enhancing capabilities of modern valve actuation and turbocharging with the improved fuel efficiency and low emissions of gasoline direct injection. The engines are based on GM’s global high-feature 3.6L V6 engine. A premium sport brand vehicle is employed as the demonstrator platform.
Bosch is equipping the new Mercedes-Benz CLS 350 CGI with very fast-switching piezo injectors to support the spray-guided combustion process. Gasoline direct injection with piezo injectors can reduce fuel consumption by up to 15% compared with today’s port fuel injection, according to Bosch. (Earlier post.)
With global fuel prices at record levels, Bosch is pleased to partner with Ricardo to advance technologies that deliver improved fuel efficiency of gasoline engines. The DI BOOST concept is a viable solution that by downsizing engine displacement dramatically improves fuel consumption and performance in gasoline vehicles.—John Moulton, president, powertrain division, Robert Bosch Corporation
|Bosch piezo injector for gasoline direct injection, introduced on the Mercedes-Benz CLS 350 CGI. Click to enlarge.|
The first phase of DI BOOST, the design and procurement of prototype engines, was completed in January 2006. The next phase, which started in March 2006, concentrates on base engine calibration for best efficiency and driveability. In parallel, vehicle integration is nearing completion. Future phases will focus on achieving SULEV emissions levels via high-pressure start capability and split injection.
Bosch is providing the complete DI Motronic engine management system including the new, second generation direct-injection fuel system as well as ignition, air and exhaust control. Ricardo has contributed to the study using its expertise for prototype powertrain integration and providing base engine calibration work on modern engine dynamometers in Belleville, Mich.