Patents by Inventor Tetsuo Tokuoka
Tetsuo Tokuoka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9200559Abstract: Provided is a combustion chamber applied in a gas engine including: a main combustion chamber including, at a central portion of its ceiling, an auxiliary combustion chamber; and a piston. A peripheral portion of a top surface of the piston is a flat surface. A raised portion, which has a curved surface and which is a solid of revolution, is formed at a central portion of the top surface, the raised portion being joined to the flat surface of the peripheral portion via a curved surface. When the piston is positioned at a top dead center, nozzle holes of the auxiliary combustion chamber jet out flame jets to a portion at which the raised portion of the top surface of the piston and the flat surface of the peripheral portion of the top surface of the piston are joined together.Type: GrantFiled: December 27, 2010Date of Patent: December 1, 2015Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Hiroyoshi Ishii, Tetsuo Tokuoka
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Patent number: 9140229Abstract: A knocking control system comprises a knocking determiner device for determining whether or not knocking with a predetermined intensity or higher has occurred in a cylinder of a gas engine in each cycle; an integration variable calculator which adds to an integration variable CT when the knocking determiner device determines that the knocking with the predetermined intensity or higher has occurred, and subtracts from the integration variable CT when the knocking determiner determines that the knocking with the predetermined intensity or higher has not occurred; and a main controller for reducing a power output of the cylinder if the integration variable CT is not less than a threshold.Type: GrantFiled: September 1, 2009Date of Patent: September 22, 2015Assignee: Kawasaki Jukogyo Kabushiki KaishaInventors: Tsukasa Imamura, Tomohiko Sugimoto, Tetsuo Tokuoka, Hiroyoshi Ishii
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Patent number: 8783226Abstract: A knocking control system for a gas engine of the present invention, being configured to calculate a knocking occurrence ratio (SEV) which is a ratio of a cycle number of cycles in which a predetermined knocking occurs for a period of the cycles of the predetermined cycle number, to the predetermined cycle number, decide a target value of an ignition timing of the ignition device based on a deviation (?SEV) between an occurrence ratio delay calculation value (SEVAVE) obtained by performing delay calculation of the knocking occurrence ratio and a predetermined occurrence ratio target value (SEVSET), and drive the ignition device so that the ignition timing reaches a command value (IGN) decided according to the target value.Type: GrantFiled: September 17, 2009Date of Patent: July 22, 2014Assignee: Kawasaki Jukogyo Kabushiki KaishaInventors: Tsukasa Imamura, Tomohiko Sugimoto, Tetsuo Tokuoka, Hiroyoshi Ishii
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Publication number: 20130019837Abstract: Provided is a combustion chamber applied in a gas engine including: a main combustion chamber including, at a central portion of its ceiling, an auxiliary combustion chamber; and a piston. A peripheral portion of a top surface of the piston is a flat surface. A raised portion, which has a curved surface and which is a solid of revolution, is formed at a central portion of the top surface, the raised portion being joined to the flat surface of the peripheral portion via a curved surface. When the piston is positioned at a top dead center, nozzle holes of the auxiliary combustion chamber jet out flame jets to a portion at which the raised portion of the top surface of the piston and the flat surface of the peripheral portion of the top surface of the piston are joined together.Type: ApplicationFiled: December 27, 2010Publication date: January 24, 2013Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Hiroyoshi Ishii, Tetsuo Tokuoka
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Publication number: 20130000598Abstract: A gas engine is configured to inject a combustion gas from an auxiliary combustion chamber through a plurality of nozzles, through which the auxiliary combustion chamber and a main combustion chamber are in communication with each other, so as to ignite a fuel in the main combustion chamber. An opening edge, at the auxiliary combustion chamber side, of each of the plurality of nozzles is formed to have a curved surface. This structure makes it possible to maintain stable combustion in the main combustion chamber while preventing degradation in combustion performance.Type: ApplicationFiled: December 27, 2010Publication date: January 3, 2013Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Tetsuo Tokuoka, Hiroyoshi Ishii
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Publication number: 20110259298Abstract: A knocking control system for a gas engine of the present invention, being configured to calculate a knocking occurrence ratio (SEV) which is a ratio of a cycle number of cycles in which a predetermined knocking occurs for a period of the cycles of the predetermined cycle number, to the predetermined cycle number, decide a target value of an ignition timing of the ignition device based on a deviation (?SEV) between an occurrence ratio delay calculation value (SEVAVE) obtained by performing delay calculation of the knocking occurrence ratio and a predetermined occurrence ratio target value (SEVSET), and drive the ignition device so that the ignition timing reaches a command value (IGN) decided according to the target value.Type: ApplicationFiled: September 17, 2009Publication date: October 27, 2011Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Tsukasa Imamura, Tomohiko Sugimoto, Tetsuo Tokuoka, Hiroyoshi Ishii
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Publication number: 20110224889Abstract: A knocking control system comprises a knocking determiner device for determining whether or not knocking with a predetermined intensity or higher has occurred in a cylinder of a gas engine in each cycle; an integration variable calculator which adds to an integration variable CT when the knocking determiner device determines that the knocking with the predetermined intensity or higher has occurred, and subtracts from the integration variable CT when the knocking determiner determines that the knocking with the predetermined intensity or higher has not occurred; and a main controller for reducing a power output of the cylinder if the integration variable CT is not less than a threshold.Type: ApplicationFiled: September 1, 2009Publication date: September 15, 2011Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Tsukasa Imamura, Tomohiko Sugimoto, Tetsuo Tokuoka, Hiroyoshi Ishii
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Publication number: 20110214649Abstract: A control system for a gas engine including a controller being configured to execute load equalization control such that a fuel feed amount corresponding to a higher-temperature cylinder of a first predetermined number which is selected to include a highest exhaust gas temperature, among cylinders which are controlled targets, is reduced, and a fuel feed amount corresponding to a lower-temperature cylinder of a second predetermined number which is selected to include a lowest exhaust gas temperature, among the cylinders which are the controlled targets, is increased; and a sum of the first predetermined number and the second predetermined number being less than the number of all of the plurality of cylinders so that there is a cylinder whose fuel feed amount is not changed.Type: ApplicationFiled: September 17, 2009Publication date: September 8, 2011Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Tsukasa Imamura, Tomohiko Sugimoto, Tetsuo Tokuoka, Hiroyoshi Ishii