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:
May. 10, 2005
Filed:
Sep. 24, 2004
Akira Demizu, Tokyo, JP;
Minoru Abe, Tokyo, JP;
Akira Demizu, Tokyo, JP;
Minoru Abe, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A device for controlling the ignition timing for internal combustion engines correctly detecting fault of a knocking sensor over the whole rotational range of the engine. The device for controlling the ignition timing takes out knocking signals and produces an ignition timing control signal relying upon the knocking signals, and comprises a knocking sensor, a microcomputerfor producing a fault detection execution signal for executing the detection of fault of the knocking sensor and for applying a pulse voltage to the knocking sensorrelying upon the fault detection execution signal, comparison meansandfor comparing the charging voltage or discharging voltage of the knocking sensorwith two different threshold values, and logic means (NOR circuit)for obtaining an OR of the outputs of the comparison meansand. The microcomputerfinds the sum of pulse widths output by the logic means during the period of detecting the fault and judges the fault of the knocking sensor relying upon the sum that is found of the pulse widths.