Patents by Inventor Toshiro Itatsu
Toshiro Itatsu 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: 10591506Abstract: The purpose of the present invention is to provide a rotation speed detection device which achieves improved detection accuracy regardless of a compressor and the operating state of the compressor, and enables the prevention of the breakage of a detection unit. A rotation speed detection device for a compressor, wherein a detection unit for detecting full blades and splitter blades that are blades approaching a compressor casing of the compressor in response to a change in the inductance of a magnetic field is provided. The detection unit is provided in an overlap region in which the full blades and the splitter blades that are all blades can be detected and the exposure pressure is in the range of a gauge pressure of one atmosphere or less.Type: GrantFiled: July 29, 2013Date of Patent: March 17, 2020Assignees: YANMAR CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takeshi Takahashi, Hidenori Nomura, Mitsuhiro Hibino, Kazuhiro Yamada, Toshiro Itatsu
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Patent number: 9995239Abstract: An engine of the invention includes an engine main unit having cylinders, an intake line, an exhaust line, a supercharger, a turbo sensor detecting a rotational speed of the supercharger, a control device controlling, based on signal from the turbo sensor, an operating state of the engine main unit that has a correlation with the rotational speed of the supercharger, and a crank angle sensor detecting a rotation angle of a crankshaft. The control device recognizes timings at which the cylinders are in a top dead center state based on detection signals of the crank angle sensor and, also, makes a disconnection judgment for the turbo sensor at non-top dead center timings that are within one combustion cycle of the engine main unit and at which none of the plurality of cylinders are in a top dead center state.Type: GrantFiled: February 18, 2013Date of Patent: June 12, 2018Assignees: YANMAR CO. , LTD., TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takeshi Takahashi, Toshiro Itatsu
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Publication number: 20150198624Abstract: The purpose of the present invention is to provide a rotation speed detection device which achieves improved detection accuracy regardless of a compressor and the operating state of the compressor, and enables the prevention of the breakage of a detection unit. A rotation speed detection device for a compressor, wherein a detection unit for detecting full blades and splitter blades that are blades approaching a compressor casing of the compressor in response to a change in the inductance of a magnetic field is provided. The detection unit is provided in an overlap region in which the full blades and the splitter blades that are all blades can be detected and the exposure pressure is in the range of a gauge pressure of one atmosphere or less.Type: ApplicationFiled: July 29, 2013Publication date: July 16, 2015Inventors: Takeshi Takahashi, Hidenori Nomura, Mitsuhiro Hibino, Kazuhiro Yamada, Toshiro Itatsu
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Publication number: 20150034046Abstract: An engine of the invention includes an engine main unit having cylinders, an intake line, an exhaust line, a supercharger, a turbo sensor detecting a rotational speed of the supercharger, a control device controlling, based on signal from the turbo sensor, an operating state of the engine main unit that has a correlation with the rotational speed of the supercharger, and a crank angle sensor detecting a rotation angle of a crankshaft. The control device recognizes timings at which the cylinders are in a top dead center state based on detection signals of the crank angle sensor and, also, makes a disconnection judgment for the turbo sensor at non-top dead center timings that are within one combustion cycle of the engine main unit and at which none of the plurality of cylinders are in a top dead center state.Type: ApplicationFiled: February 18, 2013Publication date: February 5, 2015Inventors: Takeshi Takahashi, Toshiro Itatsu
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Patent number: 8191370Abstract: In an engine equipped with a supercharger consisting of a compressor having a plurality of blades on a turbine shaft and a turbine, at least one index means provided on the turbine shaft or the plurality of blades, and a turbo angular velocity sensor, which detects a rotation of the index means and a rotation of the plurality of blades respectively and connected to an ECU. In the engine, also, a turbo angular velocity computing means, which calculates an angular velocity by obtaining a plurality of pulses per one rotation of the turbine shaft, is provided.Type: GrantFiled: April 19, 2007Date of Patent: June 5, 2012Assignee: Yanmar Co., Ltd.Inventors: Kouji Shimizu, Takashi Miyamoto, Takao Kawabe, Tetsuo Sakaki, Isamu Kawashima, Toshiro Itatsu
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Patent number: 8166951Abstract: An engine includes an angular velocity detecting means 10 for detecting a rotation angular velocity of a crankshaft 11 of the engine, a torque generated by the engine detecting means for detecting a variability of the angular velocity amplitude obtained by the angular velocity detecting means 10 as the variability of the torque generated by the engine. The engine compensates a fuel injection quantity by comparing the angular velocity amplitude detected by the angular velocity detecting means with the adequate angular velocity amplitude.Type: GrantFiled: April 19, 2007Date of Patent: May 1, 2012Assignee: Yanmar Co., Ltd.Inventors: Takeshi Takahashi, Tooru Yoshizuka, Yukihiro Shinohara, Keiji Ooshima, Toshiro Itatsu
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Patent number: 8060292Abstract: A cetane number detection device in which an angular velocity detection device (10) for detecting the rotation angular velocity of the crankshaft (11) of an engine (54), and which detects a variation in the value of the amplitude of the angular velocity detected by the angular velocity detection device (10) as a variation in cetane number.Type: GrantFiled: April 19, 2007Date of Patent: November 15, 2011Assignees: Yanmar Co., Ltd., Toyota Jidosha Kabushiki KaishaInventors: Takeshi Takahashi, Terumitsu Takahata, Hidenori Nomura, Gou Asai, Yukihiro Shinohara, Keiji Ooshima, Toshiro Itatsu
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Publication number: 20100236531Abstract: In an engine 1 equipped with a supercharger 40 consisting of a compressor 41 having a plurality of blades 45 on a turbine shaft 42 and a turbine 42, at least one index means 44 is provided on the turbine shaft 42 or the plurality of blades 45, and a turbo angular velocity sensor 62, which detects a rotation of the index means 44 and a rotation of the plurality of blades 45 respectively, is provided and connected to an ECU 60. In the engine 1, also, a turbo angular velocity computing means, which calculates an angular velocity by obtaining a plurality of pulses per one rotation of the turbine shaft, is provided.Type: ApplicationFiled: April 19, 2007Publication date: September 23, 2010Applicants: Yanmar Co., Ltd., Applied Electronics Corporation, Toyota Jidosha Kabushiki KaishaInventors: Kouji Shimizu, Takashi Miyamoto, Takao Kawabe, Tetsuo Sakaki, Isamu Kawashima, Toshiro Itatsu
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Publication number: 20100030453Abstract: A cetane number detection means in which an angular velocity detection means (10) for detecting the rotation angular velocity of the crankshaft (11) of an engine (54), and which detects a variation in the value of the amplitude of the angular velocity detected by the angular velocity detection means (10) as a variation in cetane number.Type: ApplicationFiled: April 19, 2007Publication date: February 4, 2010Applicants: Yanmar Co., Ltd., Toyota Jidosha Kabushiki kaishaInventors: Takeshi Takahashi, Terumitsu Takahata, Hidenori Nomura, Gou Asao, Yukihiro Shinohara, Keiji Ooshima, Toshiro Itatsu
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Publication number: 20100006077Abstract: An engine includes an angular velocity detecting means 10 for detecting a rotation angular velocity of a crankshaft 11 of the engine, a torque generated by the engine detecting means for detecting a variability of the angular velocity amplitude obtained by the angular velocity detecting means 10 as the variability of the torque generated by the engine. The engine compensates a fuel injection quantity by comparing the angular velocity amplitude detected by the angular velocity detecting means with the adequate angular velocity amplitude.Type: ApplicationFiled: April 19, 2007Publication date: January 14, 2010Inventors: Takeshi Takahashi, Tooru Yoshizuka, Yukihiro Shinohara, Keiji Ooshima, Toshiro Itatsu
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Patent number: 4976245Abstract: A unit injector comprising a plunger, a high pressure fuel chamber defined by the tip face of plunger, and a fuel supply port open to the high pressure fuel chamber when the plunger is at the fuel compressing operation start position. A variable volume chamber filled with fuel is provided, and the volume of the variable volume chamber is controlled by a piezoelectric element. A spill valve is also provided for spilling out the fuel in the high pressure fuel chamber to stop the fuel injection, and is controlled by the fuel pressure in the variable volume chamber. A fuel charging port connected to the variable volume chamber is open to the plunger bore at a position remote from the tip face of the plunger on a side opposite to the high pressure fuel chamber, and the variable volume chamber is charged with fuel via the fuel charging port.Type: GrantFiled: September 11, 1989Date of Patent: December 11, 1990Assignee: Toyota Jidosha Kabushiki KaishaInventors: Takeshi Takahashi, Toshiro Itatsu