Skip to Content
Find More Like This
Return to Search

Combustion mode switching with a turbocharged/supercharged engine

United States Patent

September 22, 2015
View the Complete Patent at the US Patent & Trademark Office
A method for switching between low- and high-dilution combustion modes in an internal combustion engine having an intake passage with an exhaust-driven turbocharger, a crankshaft-driven positive displacement supercharger downstream of the turbocharger and having variable boost controllable with a supercharger bypass valve, and a throttle valve downstream of the supercharger. The current combustion mode and mass air flow are determined. A switch to the target combustion mode is commanded when an operating condition falls within a range of predetermined operating conditions. A target mass air flow to achieve a target air-fuel ratio corresponding to the current operating condition and the target combustion mode is determined. The degree of opening of the supercharger bypass valve and the throttle valve are controlled to achieve the target mass air flow. The amount of residual exhaust gas is manipulated.
Mond; Alan (Ann Arbor, MI), Jiang; Li (Ann Arbor, MI)
Robert Bosch GmbH (Stuttgart, DE)
13/ 679,010
November 16, 2012
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT 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.