Ford Global Technolgoies, LLC

Joseph Van Gilder

Vincent Paul Solferino

Brian Schabel

An exhaust system for an engine has a volume element such as a muffler or a silencer. First and second exhaust pipes are connected as dual exhaust pipes upstream of or downstream of the volume element. The first exhaust pipe has a first length (L). A valve is positioned in the second exhaust pipe at a distance (D) from the volume element. The distance D is a fraction of Lsuch that the second pipe is a resonator for the first pipe with the valve in a closed position. A method of controlling exhaust noise includes positioning a valve in the first exhaust pipe at a distance (D) from a volume element with D being a specified fraction of a length of the second exhaust pipe, and closing the valve such that the first pipe provides a resonator for the second pipe to counteract standing wave in the second pipe.

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Livonia, MI, United States of America

Joseph Van Gilder