US 11,655,740 B2
Drone elimination muffler
Steve Williams, Cherry Valley, CA (US); and Kevin McClelland, Rancho Cucamonga, CA (US)
Assigned to K&N Engineering, Inc., Riverside, CA (US)
Filed by K&N Engineering, Inc., Riverside, CA (US)
Filed on Dec. 19, 2019, as Appl. No. 16/721,743.
Application 16/721,743 is a continuation of application No. 15/427,892, filed on Feb. 8, 2017, granted, now 10,519,828.
Application 15/427,892 is a continuation of application No. 15/094,788, filed on Apr. 8, 2016, granted, now 9,587,535.
Claims priority of provisional application 62/145,031, filed on Apr. 9, 2015.
Prior Publication US 2020/0123946 A1, Apr. 23, 2020
Int. Cl. F01N 1/02 (2006.01); F01N 1/16 (2006.01); F01N 1/06 (2006.01); F01N 1/08 (2006.01); G10K 11/04 (2006.01); G10K 11/16 (2006.01)
CPC F01N 1/023 (2013.01) [F01N 1/02 (2013.01); F01N 1/06 (2013.01); F01N 1/082 (2013.01); F01N 1/163 (2013.01); G10K 11/04 (2013.01); F01N 2560/06 (2013.01); G10K 11/161 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for attenuating drone exhibited by an exhaust system of an internal combustion engine, comprising:
providing a hollow canister having a length and a diameter suitable for use in a drone elimination muffler;
selecting a tuned port having a length and diameter suitable for operating in concert with the hollow canister to attenuate exhaust drone, wherein selecting the tuned port includes clamping a damper clamped within a joint between the hollow canister and the exhaust system, wherein the damper comprises a perforated stainless steel sheet;
a thermocouple in contact with a tuned port to detect and monitor temperature of the tuned port; and
connecting a first end of the tuned port to the canister and connecting a second end of the tuned port to the exhaust system, such that the canister and the tuned port substantially attenuate exhaust drone at one or more frequencies of engine operation, wherein the second end is connected to the exhaust system at an outlet of a second muffler.