US 11,702,969 B2
Acoustically tuned muffler
Keith Bartu, Dexter, MI (US); Jeremy Popovich, Brooklyn, MI (US); Brett Herwat, Jackson, MI (US); and Gabriel Ostromecki, Ann Arbor, MI (US)
Assigned to Tenneco Automotive Operating Company Inc., Northville, MI (US)
Filed by Tenneco Automotive Operating Company Inc., Lake Forest, IL (US)
Filed on May 17, 2022, as Appl. No. 17/746,358.
Application 17/746,358 is a continuation of application No. 16/119,011, filed on Aug. 31, 2018, granted, now 11,365,658.
Claims priority of provisional application 62/598,147, filed on Dec. 13, 2017.
Claims priority of provisional application 62/568,421, filed on Oct. 5, 2017.
Prior Publication US 2022/0275738 A1, Sep. 1, 2022
Int. Cl. F01N 1/08 (2006.01); F01N 1/00 (2006.01); F01N 1/02 (2006.01); G10K 11/16 (2006.01); G10K 11/172 (2006.01)
CPC F01N 1/083 (2013.01) [F01N 1/003 (2013.01); F01N 1/006 (2013.01); F01N 1/02 (2013.01); F01N 1/023 (2013.01); G10K 11/161 (2013.01); G10K 11/172 (2013.01); F01N 2210/04 (2013.01); F01N 2470/14 (2013.01); F01N 2470/18 (2013.01); F01N 2490/10 (2013.01); F01N 2490/15 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A muffler for receiving exhaust gas from a combustion engine, the muffler comprising:
a shell;
first and second inlet pipes each having outlets providing exhaust gas to a mixing chamber within the shell;
a first chamber and a second chamber positioned within the shell; and
a pair of communication pipes each including an inlet receiving exhaust gas from the mixing chamber, each communication pipe including an outlet providing exhaust to the second chamber, each of the communication pipes further including a Helmholtz opening positioned downstream of the mixing chamber, the Helmholtz openings being open to the first chamber.