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:
Jan. 12, 1993
Filed:
May. 18, 1992
Applicant:
Inventors:
Assignee:
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F02M / ;
U.S. Cl.
CPC ...
123520 ; 1231 / ; 123519 ; 123518 ;
Abstract
An evaporative fuel-purging control system for an internal combustion engine comprises a mass flowmeter and a differential pressure type flowmeter arranged in a purging passage of the engine for measuring a flow rate of a mixture of evaporative fuel and air being purged. The flowmeters have different output characteristics relative to change in the concentration of evaporative fuel in the mixture from each other. Output values from the flowmeters are compared to obtain a difference or a ratio therebetween. Failure of at least one of the flowmeters is detected based upon the difference or the ratio.