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:
Jul. 18, 1989
Filed:
Feb. 03, 1988
Applicant:
Inventors:
James J Samuel, Essington, GB;
Albert R Tingey, Whitacre Heath, Nr. Coleshill, GB;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02D / ;
U.S. Cl.
CPC ...
123489 ; 123440 ;
Abstract
In an engine management system which stores a control value and increments or decrements this according to whether an oxygen sensor in the exhaust system indicates that the engine is running lean or rich and which controls the duration of pulses applied to fuel injectors of the engine according to the stored control value, a compensating adjustment is determined and applied to the pulse length duration in order to maintain the mark/space ratio of the indicating signal from the oxygen sensor at an optimum value. This avoids unacceptable exhaust emissions which might otherwise occur under some conditions.