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:
Nov. 20, 2001
Filed:
May. 02, 2000
Applicant:
Inventors:
Shin Adachi, Toyota, JP;
Hidetoshi Amano, Okazaki, JP;
Assignee:
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01M 1/500 ;
U.S. Cl.
CPC ...
G01M 1/500 ;
Abstract
In a diagnostic apparatus for an internal combustion engine, an electronic control unit recognizes occurrence of a misfire in the engine based on fluctuations of the rotational speed of a crankshaft detected by a rotation speed sensor. Based on the detected incidences of misfire, the electronic control unit performs diagnostics. The electronic control unit turns on a warning light when, after the first diagnosis of the presence of an abnormality, a second diagnosis of the presence of an abnormality is made without the return of the engine to the normal state being recognized after a restart of the engine.