초록 ▼

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 o

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.

대표청구항 ▼

An exhaust gas sensor for an internal combustion engine having exhaust means, comprising: a nipple having first and second opposite distal ends and mounted to said exhaust means at said first distal end and communicating with exhaust passing through said exhaust means, said nipple having a restricte

An exhaust gas sensor for an internal combustion engine having exhaust means, comprising: a nipple having first and second opposite distal ends and mounted to said exhaust means at said first distal end and communicating with exhaust passing through said exhaust means, said nipple having a restricted orifice extending therethrough from said first distal end to said second distal end which permits diffusion of gaseous exhaust through said orifice, and reduces diffusion of particulate exhaust through said orifice; an antechamber mounted to said nipple at said second distal end and external to said exhaust means and communicating with said orifice such that gaseous exhaust diffuses through said orifice into said antechamber; a sensor element mounted to said antechamber and sensing said gaseous exhaust therein.