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:
Dec. 31, 1991
Filed:
Feb. 19, 1991
Applicant:
Inventor:
Hiromichi Miwa, Kanagawa, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01M / ;
U.S. Cl.
CPC ...
73115 ;
Abstract
A system for detecting combustion state in an internal combustion engine, detects cylinder pressures in a detecting range from 120.degree. to 240.degree. of crank angle, i.e. from 60.degree. BTDC and 60.degree. ATDC positions, for respective cylinders by means of cylinder pressure sensors, to predict cylinder pressures in a range other than the detecting range in compression and expansion strokes. On the basis of these cylinder pressures, the system derives an indicated mean effective pressure P.sub.i.sup.+ i. This indicated mean effective pressure P.sub.i.sup.+ i is used for determining occurence of misfire in the engine.