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Title: Combustion mode switching with a turbocharged/supercharged engine

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.
Authors:
;
Publication Date:
OSTI Identifier:
1215834
Report Number(s):
9,140,199
13/679,010
DOE Contract Number:
EE0003533
Resource Type:
Patent
Resource Relation:
Patent File Date: 2012 Nov 16
Research Org:
Robert Bosch GmbH, Stuttgart (Germany)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS