Patents by Inventor Yuichi TSUYUKI
Yuichi TSUYUKI 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: 11835022Abstract: Provided is an engine working apparatus capable of smoothly decelerating an engine. The engine working apparatus includes: an internal combustion engine including a piston reciprocally movable in a cylinder and a combustion chamber defined by the piston; an ignition plug configured to ignite air-fuel mixture in the combustion chamber; a detector configured to detect a rotation number of the internal combustion engine; and a controller configured to control an ignition timing of the ignition plug based on the detected rotation number, execute feedback control of determining the ignition timing based on a deviation between a target rotation number and the detected rotation number, and to execute the feedback control when the detected rotation number satisfies a predetermined deceleration condition.Type: GrantFiled: January 25, 2022Date of Patent: December 5, 2023Assignees: YAMABIKO CORPORATION, OPPAMA INDUSTRY CO., LTD.Inventors: Yuta Kobayashi, Takahiro Yamazaki, Yuichi Tsuyuki, Kohsuke Watanabe
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Patent number: 11761415Abstract: An ignition coil unit includes: an ignition circuit including a primary coil and a secondary coil; a power generator including a generator coil; a controller configured to control an ignition timing of the ignition circuit by an input signal generated by an induced voltage of the generator coil; and a sensor configured to input load information to the controller. The controller includes a memory configured to store working time information which corresponds to operating information based on the input information and the load information, as matrix data composed of the operating information, the load information and time data.Type: GrantFiled: October 14, 2021Date of Patent: September 19, 2023Assignees: OPPAMA INDUSTRY CO., LTD., YAMABIKO CORPORATIONInventors: Takuo Yoshizaki, Atsushi Hoshino, Yuichi Tsuyuki, Kousuke Watanabe
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Publication number: 20230003184Abstract: An ignition coil unit includes: an ignition circuit including a primary coil and a secondary coil; a power generator including a generator coil; a controller configured to control an ignition timing of the ignition circuit by an input signal generated by an induced voltage of the generator coil; and a sensor configured to input load information to the controller. The controller includes a memory configured to store working time information which corresponds to operating information based on the input information and the load information, as matrix data composed of the operating information, the load information and time data.Type: ApplicationFiled: October 14, 2021Publication date: January 5, 2023Applicants: Oppama Industry Co., Ltd., Yamabiko CorporationInventors: TAKUO YOSHIZAKI, ATSUSHI HOSHINO, YUICHI TSUYUKI, KOUSUKE WATANABE
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Publication number: 20220235731Abstract: Provided is an engine working apparatus capable of smoothly decelerating an engine. The engine working apparatus includes: an internal combustion engine including a piston reciprocally movable in a cylinder and a combustion chamber defined by the piston; an ignition plug configured to ignite air-fuel mixture in the combustion chamber; a detector configured to detect a rotation number of the internal combustion engine; and a controller configured to control an ignition timing of the ignition plug based on the detected rotation number, execute feedback control of determining the ignition timing based on a deviation between a target rotation number and the detected rotation number, and to execute the feedback control when the detected rotation number satisfies a predetermined deceleration condition.Type: ApplicationFiled: January 25, 2022Publication date: July 28, 2022Inventors: Yuta Kobayashi, Takahiro Yamazaki, Yuichi Tsuyuki, Kohsuke Watanabe
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Patent number: 10273925Abstract: An internal combustion engine according to the present invention has an ignition control device. When a rotational speed of the internal combustion engine increases beyond a predetermined rotational over speed, the ignition control device advances an ignition timing of the ignition plug to a first BTDC angle where proper combustion is performed. Further, the ignition control device performs a misfire stroke or strokes of the ignition plug in one rotation or rotations of the crankshaft after the proper combustion is performed by activating the ignition plug at the first BTDC angle.Type: GrantFiled: December 20, 2016Date of Patent: April 30, 2019Assignees: YAMABIKO CORPORATION, OPPAMA INDUSTRY CO., LTDInventors: Koichirou Ogura, Kohsuke Watanabe, Naoto Kawahara, Yuichi Tsuyuki
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Patent number: 9726095Abstract: An engine-driven working machine including a controller by which a time period until the rotation speed limitation mode is canceled can be shortened. After a throttle valve is moved to a fully-closed position by an operation to allow the engine to finish the fast idling state and while the engine is transited to an idling state, the controller cancels the rotation speed limitation mode by detecting an event in which a cycle period of rotation speed variations of the engine is longer than a cycle period of rotation speed variation in the fast idling state.Type: GrantFiled: October 13, 2015Date of Patent: August 8, 2017Assignees: YAMIBIKO CORPORATION, OPPAMA INDUSTRY CO., LTD.Inventors: Takuo Yoshizaki, Yuichi Tsuyuki, Toshiyuki Takano, Masao Iwata, Kiyoshige Enomoto
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Publication number: 20170184067Abstract: An internal combustion engine according to the present invention has an ignition control device. When a rotational speed of the internal combustion engine increases beyond a predetermined rotational over speed, the ignition control device advances an ignition timing of the ignition plug to a first BTDC angle where proper combustion is performed. Further, the ignition control device performs a misfire stroke or strokes of the ignition plug in one rotation or rotations of the crankshaft after the proper combustion is performed by activating the ignition plug at the first BTDC angle.Type: ApplicationFiled: December 20, 2016Publication date: June 29, 2017Inventors: Koichirou OGURA, Kohsuke WATANABE, Naoto KAWAHARA, Yuichi TSUYUKI
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Publication number: 20160123256Abstract: An engine-driven working machine is provided, in which a time period until the rotation speed limitation mode is canceled can be shortened. After the throttle valve (10) is moved to a fully-closed position by an operator's operation to allow the engine (2) to finish the fast idling state and while the engine (2) is transited to an idling state, the controller (18) cancels the rotation speed limitation mode by detecting an event that a cycle period of rotation speed variations of the engine (2) is longer than a cycle period of rotation speed variation in the fast idling state.Type: ApplicationFiled: October 13, 2015Publication date: May 5, 2016Inventors: Takuo YOSHIZAKI, Yuichi TSUYUKI, Toshiyuki TAKANO, Masao IWATA, Kiyoshige ENOMOTO