US Patent:
20110276248, Nov 10, 2011
Inventors:
Timothy J. Johnson - Clinton Township MI, US
Kevin C. Wong - Ann Arbor MI, US
Mark D. Finkel - Clinton Township MI, US
Steven M. Hubble - Ann Arbor MI, US
Roger Bennett - New Baltimore MI, US
Richard W. Gushman - Rochester Hills MI, US
Kim Bloxsom - New Baltimore MI, US
Joshua J. Ksiazkiewicz - Gilbert AZ, US
Assignee:
GM GLOBAL TECHNOLOGY OPERATIONS, INC. - Detroit MI
International Classification:
F02D 45/00
F01L 1/34
Abstract:
A control system for an engine includes a restriction determination module and a valve control module. The restriction determination module determines a desired exhaust back pressure of the engine based on an exhaust flow rate of the engine. The valve control module selectively adjusts a valve position of an exhaust valve that restricts an exhaust flow of the engine based on the desired exhaust back pressure. The exhaust valve may include a valve body, a throttle plate, and an annular protrusion coupled to an inner surface of the valve body and protruding towards the throttle plate. The annular protrusion may abut a side of the throttle plate and may restrict fluid flow through an annular space between the throttle plate and the inner surface when the throttle plate is positioned in a rotational position transverse to a direction of fluid flow. A related method is also provided.