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. 29, 1987
Filed:
Oct. 06, 1981
Andre Douaud, Puteaux, FR;
Joseph Rialan, Meudon, FR;
Institut Francais du Petrole, Rueil-Malmaison, FR;
Abstract
The method comprises detecting, during the combustion phase in at least one engine cylinder, the angular position of the crankshaft at which the value of the ratio of the volume of burnt gases to the overall gas volume in the cylinder reaches a preselected value, and adjusting the ignition timing to make said detected position of the crankshaft coincide with a predetermined position. The method also includes detecting for all cycles of operation the flame front in all the cylinders of the engine. The number of signals delivered by one of the detectors are counted for a specified number of cycles of operation of the engine and the average value of the change in angular position of the crankshaft during which time said signals are counted is determined. Accordingly, depending upon whether the number of signals counted in another cylinder falls below or above the count in the first cylinder, a corresponding reference signal is produced for controlling ignition timing.