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:
Sep. 05, 1978
Filed:
Nov. 30, 1976
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02D / ; F07D / ; F02M / ;
U.S. Cl.
CPC ...
60276 ; 60301 ; 1231 / ; 1231 / ; 1231 / ;
Abstract
An apparatus for purifying an exhaust gas on the basis of a single three-functional catalyst capable of oxidizing hydrocarbons and carbon monoxide, and simultaneously reducing nitrogen oxides, where a fuel-controlling means is provided for dividing driving conditions into an accelerating stage as zone I, a steady running stage as zone II, and a slowing-down and idling stage as zone III, and controlling an air-fuel mixture to be fed from a carburetor to a reducing state of the three-functional catalyst in zone I, a three-functional state in zone II, and an oxidizing state in zone III.