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:
Aug. 17, 1993
Filed:
Feb. 13, 1991
Applicant:
Inventors:
Michael Holmes, Solihull, GB;
Benjamin J Bradshaw, Solihull, GB;
Assignee:
Lucas Industries public limited company, Solihull, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ; G01P / ;
U.S. Cl.
CPC ...
36443108 ; 36443104 ; 123419 ; 123436 ;
Abstract
In order to detect misfire in an internal combustion engine, engine speed is determined by measuring the time of passage of a crankshaft disc from a first position to a second position during every revolution. A detection circuit takes the reciprocal of the measured times of passage to form a series of engine speeds and forms the difference between consecutive engine speeds. These differences are compared with a threshold to signal a misfire when the threshold is exceeded.