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. 02, 1993
Filed:
Feb. 07, 1991
Shinya Hirota, Susono, JP;
Tokuta Inoue, Mishima, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An exhaust gas purification system for an internal combustion engine includes an engine 1 capable of fuel combustion at lean air-fuel ratios, a lean NOx catalyst 3 installed in an exhaust conduit 16 of the engine, an HC producing means for producing hydrocarbons of low boiling points utilizing fuel for the engine, and an HC supply means for supplying the hydrocarbons of low boiling points to the exhaust conduit upstream of the lean NOx catalyst 3. NOx reduction reaction needs hydrocarbons of low boiling points. The HC producing means produces hydrocarbons of low boiling points from diesel oil by cracking, fractional distillation, or both cracking and fractional distillation. The cracked and/or distilled fuel includes a large amount of hydrocarbons of low boiling points and increases NOx purification rate of the lean NOx catalyst when the hydrocarbons of low boiling points are introduced into the exhaust conduit by the HC supply means.