The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 25, 1997
Filed:
Jun. 30, 1994
Dennis W Moss, Waukesha, WI (US);
Dresser Industries, Dallas, TX (US);
Abstract
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.