US 12,435,657 B2
Gas sensor with protection tube for exhaust system
Boopathi Singalandapuram Mahadevan, Ann Arbor, MI (US); Steven L Talley, Detroit, MI (US); and Yi Zheng, Troy, MI (US)
Assigned to FCA US LLC, Auburn Hills, MI (US)
Filed by FCA US LLC, Auburn Hills, MI (US)
Filed on Dec. 13, 2022, as Appl. No. 18/065,119.
Prior Publication US 2024/0191647 A1, Jun. 13, 2024
Int. Cl. F01N 11/00 (2006.01); B01D 53/94 (2006.01); F01N 13/00 (2010.01); F01N 13/18 (2010.01)
CPC F01N 11/007 (2013.01) [B01D 53/94 (2013.01); F01N 13/008 (2013.01); F01N 13/1805 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An exhaust system for a vehicle having an internal combustion engine, the exhaust system comprising:
an exhaust pipe configured to receive an exhaust gas flow from the engine at a predetermined first velocity; and
an exhaust gas sensor assembly coupled to the exhaust pipe and in fluid communication with an interior of the exhaust pipe to sense a predetermined constituent contained within the exhaust gas flow,
wherein the exhaust gas sensor assembly includes a sensing element disposed at least partially within a protection tube assembly having a plurality of apertures configured to receive a sensor flow (SF) portion of the exhaust gas flow,
wherein the plurality of apertures has a combined total flow area that provides a surface averaged total velocity at the sensing element to be greater than or equal to 70% of the first velocity to thereby increase a dynamic response of the exhaust gas sensor assembly,
wherein the protection tube assembly comprises:
an inner protection tube having a first sidewall with a first set of apertures of the plurality of apertures, the inner protection tube at least partially receiving the sensing element therein, wherein the first set of apertures comprises (i) a first ring of annularly aligned apertures and (ii) a second ring of annularly aligned apertures; and
an outer protection tube having a second sidewall with a second set of apertures of the plurality of apertures, the outer protection tube at least partially receiving the inner protection tube,
wherein the first and second sidewalls are arranged concentrically.