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:
Apr. 21, 1981
Filed:
Dec. 13, 1979
Luigi Russo, Milan, IT;
Luciano Spaggiari, Milan, IT;
Alfa Romeo S.p.A., Milan, IT;
Abstract
This invention relates to an instrument for measuring spontaneous ignition in a cylinder of an internal combustion engine. The instrument comprises a logic gate unit, which receives pulses representative of gas ionizations between the plug electrodes and control signals having a repetition period corresponding to a prefixed number of active cycles of the cylinder being checked and a duration corresponding to a prefixed number of passive cycles of the same cylinder during a spontaneous ignition measurement stage. The logic gate unit delines a first counting signal each time it receives a control signal and a second counting signal each time it receives a pulse during the duration of said control signal. First and second counter means receive and count said first and second counting signals, thus providing an indication of the number of measurement stages effected and respectively, of the number of measurement stages, in which spontaneous ignition has occurred.