Patents by Inventor Seiichi Otani
Seiichi Otani 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: 7526942Abstract: A contact combustion-type gas sensor that can maintain its initial sensitivity over a long period of time in the presence of silicon vapor, wherein an induction portion 5 of a gas detecting element 1 contains not less than 30 percent by weight of an oxidation catalyst, and is aged in advance in an environment that contains silicon vapor serving as a poisoning substance.Type: GrantFiled: June 4, 2004Date of Patent: May 5, 2009Assignee: Riken Keiki Co., Ltd.Inventors: Seiichi Otani, Mamoru Furusato, Yoshikazu Shibasaki, Shoei Yasuda
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Patent number: 7479255Abstract: A hydrogen sensor 25 has a fitting base plate 29 in which a gas-sensing chamber 34 is formed, a specimen gas intake 35 formed on said fitting base plate 29, opening toward an exit passage 24 and introducing hydrogen gas into the gas-sensing chamber 34, a gas-sensing element 39 held in the gas-sensing chamber 34 and adapted to sense hydrogen gas, and a water-repelling filter 44 covering the specimen gas intake 35.Type: GrantFiled: November 14, 2002Date of Patent: January 20, 2009Assignee: Riken Keiki Co., Ltd.Inventors: Seiichi Otani, Yukio Nakamura, Mamoru Furusato
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Publication number: 20060133962Abstract: A contact combustion-type gas sensor that can maintain its initial sensitivity over a long period of time in the presence of silicon vapor, wherein an induction portion 5 of a gas detecting element 1 contains not less than 30 percent by weight of an oxidation catalyst, and is aged in advance in an environment that contains silicon vapor serving as a poisoning substance.Type: ApplicationFiled: June 4, 2004Publication date: June 22, 2006Applicant: Riken Keiki Co., Ltd.Inventor: Seiichi Otani
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Publication number: 20050042141Abstract: A hydrogen sensor 25 has a fitting base plate 29 in which a gas-sensing chamber 34 is formed, a specimen gas intake 35 formed on said fitting base plate 29, opening toward an exit passage 24 and introducing hydrogen gas into the gas-sensing chamber 34, a gas-sensing element 39 held in the gas-sensing chamber 34 and adapted to sense hydrogen gas, and a water-repelling filter 44 covering the specimen gas intake 35.Type: ApplicationFiled: November 14, 2002Publication date: February 24, 2005Inventors: Seiichi Otani, Yukio Nakamura, Mamoru Furusato
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Patent number: 6348872Abstract: A gas detector-alarm comprises a hot-wire gas sensor 1 having an actuating power control 7 that supplies pulsed actuating power with a cycle T0 when the concentration of gas detected by the hot-wire gas sensor is lower than a first reference level, with a cycle T1 that is shorter than said cycle T0 at least once when the concentration of gas exceeds a second reference level, and with a cycle T0 again after an alarm has been triggered.Type: GrantFiled: October 23, 2000Date of Patent: February 19, 2002Assignee: Riken Keiko Co., Ltd.Inventors: Seiichi Otani, Shoei Yasuda
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Patent number: 5150301Abstract: An air/fuel mixture ratio learning control system for an internal combustion engine using a mixed fuel employs a learnt correction coefficient which is used both in a FEEDBACK mode air/fuel ratio control and in an OPEN LOOP mode air/fuel ratio control. The learnt correction coefficient is derived based on a FEEDBACK air/fuel ratio dependent correction coefficient per one of preselected engine driving ranges and per one of preselected concentration ranges of one fuel component contained in the mixed fuel. The learnt correction coefficient is cyclically derived in a preselected stable engine driving condition during the FEEDBACK mode air/fuel ratio control for updating a previously derived and stored one to minimize a deviation of the FEEDBACK correction coefficient from a reference value.Type: GrantFiled: June 29, 1990Date of Patent: September 22, 1992Assignee: Japan Electronic Control Systems Company LimitedInventors: Masuo Kashiwabara, Hideyuki Kojima, Hiromitsu Yamaura, Seiichi Otani
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Patent number: 5103655Abstract: When the engine throttle valve is closed or very nearly closed, the induction vacuum assumes a level whereat the flow of exhaust gas through the EGR conduit can be induced to assume a sonic level and maximize. Under these conditions, by opening the EGR control valve and checking the change in induction pressure, the amount of recirculation can be monitored in a manner which enables partial EGR conduit blockage and/or similar types of malfunctions to be detected.Type: GrantFiled: June 19, 1990Date of Patent: April 14, 1992Assignee: Japan Electronic Control Systems Company LimitedInventors: Koichi Kano, Seiichi Otani, Junichi Furuya
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Patent number: 4911132Abstract: A fuel injection control system is directed a sequential injection type fuel injection internal combustion engine for injecting fuel to each engine cylinder at different timings. Acceleration enrichment asynchronous fuel injection is initiated in response to an acceleration demand. Acceleration enrichment is further performed for subsequent injection cycles to compensate for engine load indicative sensor signals which differ from actual engine load due to errors in an air flow meter.Type: GrantFiled: October 4, 1988Date of Patent: March 27, 1990Assignee: Japan Electronic Control Systems Company, LimitedInventors: Shinpei Nakaniwa, Seiichi Otani, Toru Hamada, Masanobu Osaki, Yukio Hoshino, Naoki Tomisawa
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Patent number: 4911131Abstract: An apparatus for use with a multi-cylinder internal combustion engine including a plurality of fuel injectors, each being operable in its open position for injecting fuel into an intake port with which an intake valve is in cooperation for regulating the entry of combustion ingredients into the corresponding cylinder. The apparatus includes a control circuit for operating the fuel injectors in a predetermined sequence. The control circuit determines a length of time one fuel injector to be operated is in its open position in response to selected engine operating conditions. The control circuit opens the one fuel injector at a time to terminate the determined time length substantially at the same time when the corresponding intake valve opens. In addition, the control circuit prolongs the determined time length in response to a demand for engine acceleration produced when the one fuel injector is in its open position.Type: GrantFiled: August 10, 1988Date of Patent: March 27, 1990Assignees: Nissan Motor Company, Limited, Japan Electronic Control Systems Company, LimitedInventors: Shinpei Nakaniwa, Seiichi Otani, Naoki Tomisawa, Yukio Hoshino, Syouzi Furuhashi, Tadashi Ariga
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Patent number: 4889100Abstract: A fuel injection control system is directed for a sequential injection type fuel injection internal combustion engine for injecting fuel for each engine cylinder at different timing. Acceleration enrichment asynchroneous fuel injection is initiated in response to an acceleration demand. Acceleration enrichment is further performed for subsequent given injection cycles for compensation of smaller engine load indicative sensor signal than actual engine load due to error in an air flow meter.Type: GrantFiled: December 21, 1987Date of Patent: December 26, 1989Assignee: Japan Electronic Control Systems Company, LimitedInventors: Shinpei Nakaniwa, Seiichi Otani, Toru Hamada, Masanobu Osaki, Yukio Hoshino, Naoki Tomisawa
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Patent number: 4831987Abstract: A setting device of basic fuel injection amount for an internal combustion engine in an operating region of acceleration comparing a detected amount of intake airflow with a retrieved amount of intake airflow stored with the area of opening of a throttle valve and the engine velocity used as parameter, and when the detected amount is less than the retrieved amount, modifying the detected amount on the basis of the change ratio of opening area in the throttle valve, the engine load and the engine velocity, thereby modifying the detected amount so that it is close to the amount required by the engine.Type: GrantFiled: August 27, 1987Date of Patent: May 23, 1989Assignees: Nissan Motor Co., Ltd., Nippon Denshi Kiki Co., Ltd.Inventors: Shinpei Nakaniwa, Yukio Hoshino, Naoki Tomisawa, Seiichi Otani, Tadashi Ariga, Shouji Furuhashi
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Patent number: 4817572Abstract: An electronically controlled fuel injection device for an internal combustion engine during engine acceleration determines a basic amount of injected fuel based on the amount of intake airflow detected by an airflow meter and the engine velocity until the portion filled into the intake air manifold is detected, and then a basic amount of injected fuel based on the data of intake airflow which has been recorded excluding the portion filled into the intake air manifold.Type: GrantFiled: August 27, 1987Date of Patent: April 4, 1989Assignees: Nissan Motor Co. Ltd., Nippon Denshi Kiki Co., Ltd.Inventors: Shinpei Nakaniwa, Yukio Hoshino, Naoki Tomisawa, Seiichi Otani, Tadashi Ariga, Shouji Furuhashi
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Patent number: 4655188Abstract: In controlling the air-fuel ratio in an air-fuel mixture in an internal combustion engine, a pulse duty signal Tp corresponding to the basic fuel injection quantity is operated at least from the intake air flow quantity Q and the rotation speed N of the engine, a signal of a fuel injection quantity Ti corrected by adding an appropriate correction value to said Tp is applied to a pulse-controlled fuel injection apparatus. Feedback control is carried out so that the actually detected air-fuel ratio is made to follow the aimed air-fuel ratio, and the learning correction coefficient .alpha.o is operated by learning so that the correction coefficient for this feedback control is as small as possible and the operated value is given as a correction value to Tp. Since the reliability of .alpha.o is low in a driving state area where learning is not advanced, .alpha.o of the area where learning is not advanced is estimated from .alpha.Type: GrantFiled: August 8, 1985Date of Patent: April 7, 1987Assignee: Japan Electronic Control Systems Co., Ltd.Inventors: Naoki Tomisawa, Shoji Furuhashi, Seiichi Otani