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COMPOUNDED DILUTION AND AIR CHARGING DEVICE

United States Patent Application

20120090319
A1
View the Complete Application at the US Patent & Trademark Office
An internal combustion engine includes a turbocharger and a selectively operable positive displacement supercharger downstream of the turbocharger in the intake path. An input shaft of the supercharger is mechanically coupled to and driven by a piston-driven crankshaft. A bypass valve is configured to selectively bypass at least a portion of the air from the turbocharger air outlet around the supercharger. Power and fuel consumption are optimized by operating the supercharger to dilute the fuel-air mixture to achieve an excess air factor .lamda. above 1.0, and in some cases above the upper range (.lamda.=1.3) of normal stoichiometric operation. The engine can operate in a lean low temperature combustion mode (e.g., HCCI) with the supercharger operating, and in a stoichiometric spark ignition combustion mode with the supercharger bypassed.
Mond, Alan (Ann Arbor, MI), Babajimopoulos, Aristotelis (Ann Arbor, MI), Shingne, Prasad Sunand (Ann Arbor, MI), Yilmaz, Hakan (Ann Arbor, MI), Assanis, Dionissios (Ann Arbor, MI)
ROBERT BOSCH GMBH (Stuttgart DE)
13/ 336,220
December 23, 2011
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT [0002] This invention was made with Government support under contract DE-EE0003533 awarded by the Department of Energy. The Government has certain rights in this invention.