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. 27, 1994
Filed:
Aug. 02, 1993
Applicant:
Inventor:
Masanobu Uchinami, Himeji, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F02M / ;
U.S. Cl.
CPC ...
123676 ; 123571 ; 731173 ;
Abstract
A method of diagnosing an exhaust gas recirculation control system of an engine as to occurrence of a fault in the system. The state of a pressure sensor incorporated in the exhaust gas recirculation system for controlling the recirculation is checked with the aid of various parameters involved in operation of the engine. When the pressure sensor is found as suffering from abnormality such as freezing and inoperative, execution of the diagnosis or result obtained after execution of the diagnosis is invalidated.