Patents by Inventor Tateki Mitani
Tateki Mitani 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: 8351029Abstract: An objective of the present invention is to provide an optical fiber sensor which has a simple configuration to enable sensitively measuring a refractive index of a measurement medium in a wide range of refractive indexes. An optical fiber sensor according to the present invention includes; an optical fiber having a core in which a short-period gratings are formed and a cladding, the optical fiber being made so that transmission loss occurs due to cladding-propagation-mode leakage at its cladding portion where the short-period gratings are formed; a light source from which light having a wavelength range of the cladding propagation mode is emitted; and a light receiving unit for receiving transmission or reflection light having passed through the cladding at the position where the short-period gratings are formed.Type: GrantFiled: December 3, 2008Date of Patent: January 8, 2013Assignee: Mitsubishi Electric CorporationInventors: Satoshi Nishikawa, Masakazu Takabayashi, Eiji Yagyu, Kiichi Yoshiara, Tateki Mitani, Yutarou Hamatani
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Patent number: 8295657Abstract: An optical fiber sensor includes: an optical fiber; a light source portion; and a light receiving portion. The optical fiber includes: a core that includes a grating that generates a clad mode upon receipt of light; a clad that covers the core; and a fiber jacket that covers the clad, wherein a part of the fiber jacket corresponding to an area where the grating is formed is removed so that the clad is contactable with the fuel. The light source portion includes a light cutting element that emits light, whose wavelength is within a wavelength band of the cladding mode toward the optical fiber. The light receiving portion that detects intensity of the light transmitted through the grating. The optical fiber, the light receiving portion and the light source portion are arranged linearly.Type: GrantFiled: February 25, 2010Date of Patent: October 23, 2012Assignee: Mitsubishi Electric CorporationInventors: Tateki Mitani, Satoshi Nishikawa, Shigeki Kanamaru
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Patent number: 8285086Abstract: An optical fiber sensor measuring refractive index of a medium with high sensitivity in a wide range. The optical fiber sensor includes an optical fiber causing a transmission loss due to leakage in the clad propagation mode from a portion of a core and a clad where a Bragg grating is provided, a light source permitting light in a wavelength band in the clad propagation mode to enter the optical fiber, and a light-receiving section receiving the transmitted or reflected light transmitted through the core and the clad at the portion where the Bragg grating is provided. The refractive index of the medium to be measured in contact with the clad is measured according to total intensity of the light received by the light-receiving section. The Bragg grating is inclined at a predetermined angle of inclination to the vertical line vertical to the length direction of the optical fiber.Type: GrantFiled: January 7, 2008Date of Patent: October 9, 2012Assignee: Mitsubishi Electric CorporationInventors: Satoshi Nishikawa, Masakazu Takabayashi, Kiichi Yoshiara, Eiji Yagyu, Tateki Mitani, Yutaro Hamatani
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Publication number: 20110282561Abstract: An ECU (13) includes: throttle-valve opening-degree control means (131) for controlling an intake airflow rate; target output-torque calculating means (132) for calculating a target output torque from an operating state of an engine (1) and an operation of an accelerator performed by a driver; target ignition-timing calculating means (133) for calculating target ignition timing based on the operating state of the engine (1); actual output-torque calculating means (134) for calculating an actual output torque of the engine (1) based on an engine rpm, a charging efficiency, the target ignition timing, an air-fuel ratio, and a total heating value of a fuel; and target intake-air quantity calculating means (135) for calculating a charging efficiency-to-torque conversion factor based on the charging efficiency and the actual output torque, and calculating a target charging efficiency based on the target output torque and the charging efficiency-to-torque conversion factor to calculate a target intake air quantityType: ApplicationFiled: March 4, 2009Publication date: November 17, 2011Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Tateki Mitani, Hideki Hagari, Shingo Iwai, Satoshi Nishikawa
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Publication number: 20110166771Abstract: A fuel control system of the present invention is a fuel control system that controls a fuel injection quantity of an internal combustion engine by controlling combustion of a fuel at a theoretical air-fuel ratio, and is characterized in that the fuel control system estimates a volume of the fuel injection quantity from a measured refractive-index value of the fuel and controls it.Type: ApplicationFiled: October 29, 2008Publication date: July 7, 2011Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Tateki Mitani, Satoshi Nishikawa, Shingo Iwai
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Publication number: 20110050179Abstract: An idle stop control device for determining on the basis of a charging state of a battery whether idle stop should be executed or not includes, as a unit for detecting the charge state of the battery, an optical fiber type battery solution concentration sensor including an optical fiber which is partially immersed in battery solution to measure the refractive index of the battery solution, thereby measuring the concentration of the battery solution.Type: ApplicationFiled: January 14, 2010Publication date: March 3, 2011Applicant: Mitsubishi Electric CorporationInventors: Tateki MITANI, Shigeki KONDO, Satoshi NISHIKAWA, Shingo IWAI
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Publication number: 20110043799Abstract: An optical fiber sensor includes: an optical fiber; a light source portion; and a light receiving portion. The optical fiber includes: a core that includes a grating that generates a clad mode upon receipt of light; a clad that covers the core; and a fiber jacket that covers the clad, wherein a part of the fiber jacket corresponding to an area where the grating is formed is removed so that the lad is contactable with the fuel. The light source portion includes a light cutting element that emits light, whose wavelength is within a wavelength band of the cladding mode toward the optical fiber. The light receiving portion that detects intensity of the light transmitted through the grating. The optical fiber, the light receiving portion and the light source portion are arranged linearly.Type: ApplicationFiled: February 25, 2010Publication date: February 24, 2011Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Tateki MITANI, Satoshi NISHIKAWA, Shigeki KANAMARU
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Patent number: 7859662Abstract: The detection device provides with an optical fiber composed of a core, a clad and a fiber jacket. A grating is applied to the core, and the fiber jacket located at the portion to which the grating is applied is removed so that the clad is in contact with a fuel fed to an injector of a vehicle. The detection device also provides with a light source for incidence of a light in a range of clad mode wavelength to the optical fiber, and a light-sensitive part for detecting an intensity of the light transmitting through the region to which the grating is applied. The optical fiber, light source and light-sensitive part are held in a conduit disposed in a fuel tank or between a fuel pump and the injector of the vehicle.Type: GrantFiled: September 18, 2007Date of Patent: December 28, 2010Assignee: Mitsubishi Electric CorporationInventors: Yutaro Hamatani, Shigeki Kanamaru, Tateki Mitani, Eiji Yagyu
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Publication number: 20100296080Abstract: An objective of the present invention is to provide an optical fiber sensor which has a simple configuration to enable sensitively measuring a refractive index of a measurement medium in a wide range of refractive indexes. An optical fiber sensor according to the present invention includes; an optical fiber having a core in which a short-period gratings are formed and a cladding, the optical fiber being made so that transmission loss occurs due to cladding-propagation-mode leakage at its cladding portion where the short-period gratings are formed; a light source from which light having a wavelength range of the cladding propagation mode is emitted; and a light receiving unit for receiving transmission or reflection light having passed through the cladding at the position where the short-period gratings are formed.Type: ApplicationFiled: December 3, 2008Publication date: November 25, 2010Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Satoshi Nishikawa, Masakazu Takabayashi, Eiji Yagyu, Kiichi Yoshiara, Tateki Mitani, Yutarou Hamatani
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Publication number: 20100080502Abstract: An optical fiber sensor measuring refractive index of a medium with high sensitivity in a wide range. The optical fiber sensor includes an optical fiber causing a transmission loss due to leakage in the clad propagation mode from a portion of a core and a clad where a Bragg grating is provided, a light source permitting light in a wavelength band in the clad propagation mode to enter the optical fiber, and a light-receiving section receiving the transmitted or reflected light transmitted through the core and the clad at the portion where the Bragg grating is provided. The refractive index of the medium to be measured in contact with the clad is measured according to total intensity of the light received by the light-receiving section. The Bragg grating is inclined at a predetermined angle of inclination to the vertical line vertical to the length direction of the optical fiber.Type: ApplicationFiled: January 7, 2008Publication date: April 1, 2010Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Satoshi Nishikawa, Masakazu Takabayashi, Kiichi Yoshiara, Eiji Yagyu, Tateki Mitani, Yutaro Hamatani
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Patent number: 7672544Abstract: An optical fiber sensor that can detect a liquid level or detect a property of liquid with high reliability even under a frequently vibrational environment. The optical fiber sensor includes an optical fiber that includes a core having an area where a grating is formed and a clad, the optical fiber being disposed so that at least a part of the area with the grating is immersed in liquid, a light source for making light incident to the optical fiber so that a cladding mode light having a wavelength band is generated by the grating, and a light receiving unit for detecting the intensity of light which is incident from the light source to the optical fiber and transmitted through the grating.Type: GrantFiled: May 22, 2006Date of Patent: March 2, 2010Assignee: Mitsubishi Electric CorporationInventors: Masakazu Takabayashi, Kiichi Yoshiara, Yasuhisa Shimakura, Sadayuki Matsumoto, Tateki Mitani, Shigeki Kanamaru, Kazushi Ishii
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Publication number: 20090034901Abstract: An optical fiber sensor that can detect a liquid level or detect a property of liquid with high reliability even under a frequently vibrational environment. The optical fiber sensor includes an optical fiber that includes a core having an area where a grating is formed and a clad, and is disposed so that at least a part of the area with the grating is immersed in liquid, a light source for making light incident to the optical fiber so that a cladding mode light having a wavelength band is occurred by the grating, and a light receiving unit for detecting the intensity of light which is incident from the light source to the optical fiber and transmitted through the grating.Type: ApplicationFiled: May 22, 2006Publication date: February 5, 2009Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Masakazu Takabayashi, Kiichi Yoshiara, Yasuhisa Shimakura, Sadayuki Matsumoto, Tateki Mitani, Shigeki Kanamaru, Kazushi Ishii
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Publication number: 20080204714Abstract: The detection device provides with an optical fiber composed of a core, a clad and a fiber jacket. A grating is applied to the core, and the fiber jacket located at the portion to which the grating is applied is removed so that the clad is in contact with a fuel fed to an injector of a vehicle. The detection device also provides with a light source for incidence of a light in a range of clad mode wavelength to the optical fiber, and a light-sensitive part for detecting an intensity of the light transmitting through the region to which the grating is applied. The optical fiber, light source and light-sensitive part are held in a conduit disposed in a fuel tank or between a fuel pump and the injector of the vehicle.Type: ApplicationFiled: September 18, 2007Publication date: August 28, 2008Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Yutaro HAMATANI, Shigeki KANAMARU, Tateki MITANI, Eiji YAGYU
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Patent number: 7313487Abstract: A leak detecting system for a transpiration purge system including a fuel tank 1 and a canister 13 includes a jet pump 8, which leads the atmosphere into the fuel tank 1 using a return flow of excess fuel of fuel pumped to an internal combustion engine, internal pressure measuring means 15, and fuel volume detecting means 18. After intaking air via pressurizing means for a predetermined time, the leak detecting system judges that a leak is present when a holding pressure measurement value in a state in which the transpiration purge system is closed is lower than a decompression calculation value calculated from a pressurization measurement value, an air volume, and a leak hole diameter.Type: GrantFiled: February 10, 2005Date of Patent: December 25, 2007Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hiroshi Yoshioka, Tateki Mitani
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Patent number: 7207209Abstract: A leak detecting system detects fuel gas leakage of a fuel tank. The detecting system includes a fuel pump, a jet pump, and a bent valve, which are disposed in the fuel tank. A fuel flow path system includes a relief line connected to the fuel pump for relieving an excess fuel, a relief flow path switching valve disposed in the relief line, and a sub-line for connecting the switching valve and the vent valve. An air flow path system includes a first air flow line to connect the vent valve to a canister, a second air flow line for connecting the first air flow line to the jet pump, and an air flow switching valve for switching communication between the first and second air flow lines. An inner pressure sensor is provided to the fuel tank for detecting an inner pressure of the fuel tank.Type: GrantFiled: September 13, 2004Date of Patent: April 24, 2007Assignees: Nifco Inc., Mitsubishi Denki Kabushiki KaishaInventors: Tateki Mitani, Toshihide Kimisawa, Tsuyoshi Kato
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Publication number: 20070044549Abstract: A leak detecting system for a transpiration purge system including a fuel tank 1 and a canister 13 includes a jet pump 8, which leads the atmosphere into the fuel tank 1 using a return flow of excess fuel of fuel pumped to an internal combustion engine, internal pressure measuring means 15, and fuel volume detecting means 18. After supplying the air from pressurizing means for a predetermined time, the leak detecting system judges that a leak is present when a holding pressure measurement value in a state in which the transpiration purge system is closed is lower than a decompression calculation value calculated from a pressurization measurement value, an air volume, and a leak hole diameter.Type: ApplicationFiled: February 10, 2005Publication date: March 1, 2007Inventors: Hiroshi Yoshioka, Tateki Mitani
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Patent number: 7077112Abstract: A fuel vapor leak detecting apparatus, includes: a valve which is in a vapor purge system including a canister that is communicated with a fuel tank and an internal combustion engine, and which controllably closes the vapor purge system; a pressurizing section which introduces atmospheric air into the vapor purge system to pressurize the vapor purge system; and an internal-pressure measuring section which detects an internal pressure of the vapor purge system. The pressurizing section supplies the air for a predetermined time in a state where the vapor purge system is closed. When the internal pressure measured by the internal-pressure measuring section at the air supply is equal to or lower than a preset criterion pressure, it is judged that leak occurs.Type: GrantFiled: February 5, 2004Date of Patent: July 18, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Tateki Mitani, Shigeki Kanamaru, Hiroshi Yoshioka, Kazushi Ishii
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Patent number: 6986341Abstract: An apparatus for detecting fuel-vapor gas leaks that includes a jet pump (8) that introduces outside air into and pressurizes a vapor purge system including a fuel tank (1) by gasoline flow from a fuel pump (2); an internal pressure sensor (14) for measuring vapor purge system internal pressure, an open/close controllable reference orifice (21) that causes leakage through a reference leak hole; and a storage device for storing as an initial curve pressure changes during pressurization by the jet pump (8) for a predetermined time period, with the reference orifice (21) alone opened. The device can accurately detect leakage even while an internal combustion engine is running because it judges leak presence/absence by comparing a time series in a pressure curve obtained by jet pump (8) pressurization over the predetermined time period while idling with the vapor purge system completely shut-off, with a time series in the initial curve.Type: GrantFiled: November 13, 2003Date of Patent: January 17, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Tateki Mitani, Seiji Tsutsui, Shigeki Kanamaru, Hiroshi Yoshioka
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Publication number: 20050133097Abstract: A leak detecting system detects fuel gas leakage of a fuel tank. The detecting system includes a fuel pump, a jet pump, and a bent valve, which are disposed in the fuel tank. A fuel flow path system includes a relief line connected to the fuel pump for relieving an excess fuel, a relief flow path switching valve disposed in the relief line, and a sub-line for connecting the switching valve and the vent valve. An air flow path system includes a first air flow line to connect the vent valve to a canister, a second air flow line for connecting the first air flow line to the jet pump, and an air flow switching valve for switching communication between the first and second air flow lines. An inner pressure sensor is provided to the fuel tank for detecting an inner pressure of the fuel tank.Type: ApplicationFiled: September 13, 2004Publication date: June 23, 2005Inventors: Tateki Mitani, Toshihide Kimisawa, Tsuyoshi Kato
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Patent number: 6868834Abstract: A fuel supply system includes a bracket fitted around an opening portion of a fuel tank and having a discharge pipe disposed, and a fuel pump for sucking a fuel from the fuel tank and discharging the fuel through the discharge pipe, the fuel pump being mounted on the bracket. The fuel pump includes a pump portion for sucking and discharging the fuel from the fuel tank, a motor portion for rotating a rotor accommodated within the pump portion, through which the fuel discharged from the pump portion is passed internally, a cover out portion for accommodating a discharge filter for filtering the fuel passed through the motor portion, and a debris storage case for storing the debris in the fuel that is captured by the discharge filter, the case being disposed near the discharge filter.Type: GrantFiled: September 13, 2004Date of Patent: March 22, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Tateki Mitani, Minoru Takata, Yusaku Sakai