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:
Mar. 06, 2001
Filed:
May. 07, 1999
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
To obtain a combustion state detecting device in which a detection range is optimized to thereby make it possible to improve the S/N ratio, thereby making it possible to enhance the accuracy in detection of the combustion state of the internal combustion engine, in particular, the accuracy in knock detection. The combustion state detecting device for an internal combustion engine includes an ignition plug 4 which discharges by application of the ignition high voltage to fire a fuel-air mixture within a cylinder of an internal combustion engine, a bias circuit,for applying a bias voltage to the ignition plug, a current detector circuit,for detecting an ion current corresponding to the quantity of ions which are generated within the cylinder in which the fuel-air mixture is being burned as an ion current detection signal, knock signal processing means,to,for producing a knock decision signal representative of a knock occurrence state of the internal combustion engine on the basis of the ion current detection signal, and an ECU,for detecting the combustion state in the ignition plug on the basis of the ion current detection signal and the knock decision signal. The knock signal processing means sets a detection period of the knock decision signal on the basis of an integral value of the ion current detection signal.