Exhaust sensor

Details Exhaust sensor Exhaust sensor

G - Physics

01

M

G01M 15/00 (2006.01) F01N 13/00 (2010.01) G01M 15/10 (2006.01) G01N 1/22 (2006.01) G01N 1/28 (2006.01) G01N 35/10 (2006.01) F01N 7/00 (2006.01)

Patent

CA 2150266

A diffusion path is provided from the exhaust pipe of an internal combustion engine, and a restriction is provided in the diffusion path which permits diffusion of gaseous exhaust therethrough, and which reduces diffusion of particulate exhaust therethrough, reducing contamination and/or poisoning of a downstream sensor. In a lean-burn industrial engine, the exhaust temperature is lower than the operating temperature of a lean-burn oxygen sensor, and the restricted diffusion path concurrently minimizes cooling of the sensor by gaseous exhaust flow thereagainst. The sensor element is in an antechamber in a housing external of the exhaust pipe, and auxiliary heaters in the housing relieve overdriving of the internal heater of the lean-burn oxygen sensor, extending life to meet long interval industrial requirements.

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