Ford Global Technolgoies, LLC

Vincent Paul Solferino

Takeshi Abe

Lloyd Anthony Bozzi

Brian Schabel

Charles Ernest Gray

Joseph Van Gilder

Cape Alan Hall

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.

Exhaust system for an engine

An air induction arrangement for a variable displacement engine is provided. The air induction arrangement includes first and second plenums fluidly connected to respective first and second throttles . The first and second throttles are connected to respective first and second inlets . In partial operation, the air induction arrangement induces air into the first plenum . In higher power demand operation, the air induction arrangement additionally induces air through the second plenum . There is a reduction of the cancellation of acoustic output between the first and second inlets so that an acoustic output of the engine operating with only a first group of cylinders is similar to the acoustic output of the engine when the engine is operating with both groups of cylinders

Dual air induction arrangement

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Dearborn, MI, United States of America

Vincent Paul Solferino