Patents by Inventor Kei Ueyama
Kei Ueyama 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: 7650784Abstract: A flow rate sensor has a problem that a resistance value of a heat generating resistor itself varies and sensor characteristics are changed during use of the sensor for a long term. Also, the temperature of the heat generating resistor must be adjusted on a circuit substrate with a resistance constituting one side of a fixed temperature difference control circuit, and this has been one of factors pushing up the production cost. All resistances used for fixed temperature difference control are formed on the same substrate as temperature sensitive resistors of the same material. This enables all the resistances for the fixed temperature difference control to be exposed to the same environmental conditions. Hence, even when the resistances change over time, the changes over time occur substantially at the same tendency. Since the resistances for the fixed temperature difference control change over time essentially at the same rate, a resulting output error is very small.Type: GrantFiled: June 16, 2008Date of Patent: January 26, 2010Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Izumi Watanabe, Junichi Horie, Keiichi Nakada, Kei Ueyama, Masamichi Yamada
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Patent number: 7559237Abstract: The present invention provides an air flow measuring device comprising a housing with a sub-passage having a inlet and a outlet for air flow formed in the housing, the sub-passage further having a predefined curvature with a maximum downstream point and a flow measuring element located in the sub-passage at a position at least further downstream from the point.Type: GrantFiled: April 29, 2008Date of Patent: July 14, 2009Assignees: Hitachi Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Hiromu Kikawa, Izumi Watanabe, Shinya Igarashi, Keiichi Nakada, Kei Ueyama
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Patent number: 7457711Abstract: In a thermal-type airflow meter that measures an intake airflow rate in an internal combustion engine of an automobile or the like, there has been a problem that pulsation errors caused by external fluctuations under the environment including a large pulsation and reverse flow in the intake valve are difficult to be reduced. In order to solve this problem, the invention provides a flowmeter comprising a detection element that outputs a non-linear signal corresponding to a flow rate, and a regulation means that regulates an output signal of the detection element for controlling. With this construction, the regulation means executes output regulation processing that regulates irregularities of the detection element in the output signal, and inequality linearization processing that regulates an average value of the output signal after the output regulation processing by means of regulating parameters.Type: GrantFiled: May 30, 2006Date of Patent: November 25, 2008Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Atsushi Kanke, Masahiro Matsumoto, Shinya Igarashi, Keiji Hanzawa, Kei Ueyama
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Publication number: 20080250856Abstract: A flow rate sensor has a problem that a resistance value of a heat generating resistor itself varies and sensor characteristics are changed during use of the sensor for a long term. Also, the temperature of the heat generating resistor must be adjusted on a circuit substrate with a resistance constituting one side of a fixed temperature difference control circuit, and this has been one of factors pushing up the production cost. All resistances used for fixed temperature difference control are formed on the same substrate as temperature sensitive resistors of the same material. This enables all the resistances for the fixed temperature difference control to be exposed to the same environmental conditions. Hence, even when the resistances change over time, the changes over time occur substantially at the same tendency. Since the resistances for the fixed temperature difference control change over time essentially at the same rate, a resulting output error is very small.Type: ApplicationFiled: June 16, 2008Publication date: October 16, 2008Inventors: Izumi WATANABE, Junichi Horie, Keiichi Nakada, Kei Ueyama, Masamichi Yamada
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Publication number: 20080202230Abstract: The present invention provides an air flow measuring device comprising a housing with a sub-passage having a inlet and a outlet for air flow formed in the housing, the sub-passage further having a predefined curvature with a maximum downstream point and a flow measuring element located in the sub-passage at a position at least further downstream from the point.Type: ApplicationFiled: April 29, 2008Publication date: August 28, 2008Inventors: Hiromu Kikawa, Izumi Watanabe, Shinya Igarashi, Keiichi Nakada, Kei Ueyama
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Patent number: 7395707Abstract: A flow rate sensor has a problem that a resistance value of a heat generating resistor itself varies and sensor characteristics are changed during use of the sensor for a long term. Also, the temperature of the heat generating resistor must be adjusted on a circuit substrate with a resistance constituting one side of a fixed temperature difference control circuit, and this has been one of factors pushing up the production cost. All resistances used for fixed temperature difference control are formed on the same substrate as temperature sensitive resistors of the same material. This enables all the resistances for the fixed temperature difference control to be exposed to the same environmental conditions. Hence, even when the resistances change over time, the changes over time occur substantially at the same tendency. Since the resistances for the fixed temperature difference control change over time essentially at the same rate, a resulting output error is very small.Type: GrantFiled: August 18, 2006Date of Patent: July 8, 2008Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Izumi Watanabe, Junichi Horie, Keiichi Nakada, Kei Ueyama, Masamichi Yamada
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Patent number: 7377161Abstract: The present invention provides an air flow measuring device comprising a housing with a sub-passage having a inlet and a outlet for air flow formed in the housing, the sub-passage further having a predefined curvature with a maximum downstream point and a flow measuring element located in the sub-passage at a position at least further downstream from the point.Type: GrantFiled: April 3, 2007Date of Patent: May 27, 2008Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Hiromu Kikawa, Izumi Watanabe, Shinya Igarashi, Keiichi Nakada, Kei Ueyama
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Publication number: 20070169548Abstract: The present invention provides an air flow measuring device comprising a housing with a sub-passage having a inlet and a outlet for air flow formed in the housing, the sub-passage further having a predefined curvature with a maximum downstream point and a flow measuring element located in the sub-passage at a position at least further downstream from the point.Type: ApplicationFiled: April 3, 2007Publication date: July 26, 2007Inventors: Hiromu Kikawa, Izumi Watanabe, Shinya Igarashi, Keiichi Nakada, Kei Ueyama
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Patent number: 7216535Abstract: The present invention provides an air flow measuring device comprising a housing with a sub-passage having a inlet and a outlet for air flow formed in the housing, the sub-passage further having a predefined curvature with a maximum downstream point and a flow measuring element located in the sub-passage at a position at least further downstream from the point.Type: GrantFiled: June 13, 2006Date of Patent: May 15, 2007Assignees: Hitachi, Ltd., Hitachi car Engineering Co., Ltd.Inventors: Hiromu Kikawa, Izumi Watanabe, Shinya Igarashi, Keiichi Nakada, Kei Ueyama
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Patent number: 7201047Abstract: The present invention provides an air flow measuring device comprising a housing with a sub-passage having a inlet and a outlet for air flow formed in the housing, the sub-passage further having a predefined curvature with a maximum downstream point and a flow measuring element located in the sub-passage at a position at least further downstream from the point.Type: GrantFiled: May 24, 2005Date of Patent: April 10, 2007Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Hiromu Kikawa, Izumi Watanabe, Shinya Igarashi, Keiichi Nakada, Kei Ueyama
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Publication number: 20060272403Abstract: A flow rate sensor has a problem that a resistance value of a heat generating resistor itself varies and sensor characteristics are changed during use of the sensor for a long term. Also, the temperature of the heat generating resistor must be adjusted on a circuit substrate with a resistance constituting one side of a fixed temperature difference control circuit, and this has been one of factors pushing up the production cost. All resistances used for fixed temperature difference control are formed on the same substrate as temperature sensitive resistors of the same material. This enables all the resistances for the fixed temperature difference control to be exposed to the same environmental conditions. Hence, even when the resistances change over time, the changes over time occur substantially at the same tendency. Since the resistances for the fixed temperature difference control change over time essentially at the same rate, a resulting output error is very small.Type: ApplicationFiled: August 18, 2006Publication date: December 7, 2006Inventors: Izumi Watanabe, Junichi Horie, Keiichi Nakada, Kei Ueyama, Masamichi Yamada
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Publication number: 20060225497Abstract: The present invention provides an air flow measuring device comprising a housing with a sub-passage having a inlet and a outlet for air flow formed in the housing, the sub-passage further having a predefined curvature with a maximum downstream point and a flow measuring element located in the sub-passage at a position at least further downstream from the point.Type: ApplicationFiled: June 13, 2006Publication date: October 12, 2006Inventors: Hiromu Kikawa, Izumi Watanabe, Shinya Igarashi, Keiichi Nakada, Kei Ueyama
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Publication number: 20060217901Abstract: In a thermal-type airflow meter that measures an intake airflow rate in an internal combustion engine of an automobile or the like, there has been a problem that pulsation errors caused by external fluctuations under the environment including a large pulsation and reverse flow in the intake valve are difficult to be reduced. In order to solve this problem, the invention provides a flowmeter comprising a detection element that outputs a non-linear signal corresponding to a flow rate, and a regulation means that regulates an output signal of the detection element for controlling. With this construction, the regulation means executes output regulation processing that regulates irregularities of the detection element in the output signal, and inequality linearization processing that regulates an average value of the output signal after the output regulation processing by means of regulating parameters.Type: ApplicationFiled: May 30, 2006Publication date: September 28, 2006Inventors: Atsushi Kanke, Masahiro Matsumoto, Shinya Igarashi, Keiji Hanzawa, Kei Ueyama
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Patent number: 7104126Abstract: A flow rate sensor has a problem that a resistance value of a heat generating resistor itself varies and sensor characteristics are changed during use of the sensor for a long term. Also, the temperature of the heat generating resistor must be adjusted on a circuit substrate with a resistance constituting one side of a fixed temperature difference control circuit, and this has been one of factors pushing up the production cost. All resistances used for fixed temperature difference control are formed on the same substrate as temperature sensitive resistors of the same material. This enables all the resistances for the fixed temperature difference control to be exposed to the same environmental conditions. Hence, even when the resistances change over time, the changes over time occur substantially at the same tendency. Since the resistances for the fixed temperature difference control change over time essentially at the same rate, a resulting output error is very small.Type: GrantFiled: July 25, 2005Date of Patent: September 12, 2006Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Izumi Watanabe, Junichi Horie, Keiichi Nakada, Kei Ueyama, Masamichi Yamada
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Patent number: 7059183Abstract: The present invention provides an air flow measuring device comprising a housing with a sub-passage having an inlet and an outlet for air flow formed in the housing, the sub-passage further having a predefined curvature with a maximum downstream point and a flow measuring element located in the sub-passage at a position at least further downstream from the point.Type: GrantFiled: May 17, 2001Date of Patent: June 13, 2006Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Hiromu Kikawa, Izumi Watanabe, Shinya Igarashi, Keiichi Nakada, Kei Ueyama
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Patent number: 7032446Abstract: There is provided a flow rate measuring device which comprises a means for introducing a backward flow of the main passage into the sub-passage through the outlet of the sub-passage of the flow rate measuring device is provided near the outlet of the sub-passage, in order to keep the flow rate measuring element from being destroyed under the presence of dust and water in an intake manifold and which has high reliability for a long period of use and an excellent pulsation characteristic.Type: GrantFiled: February 27, 2002Date of Patent: April 25, 2006Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Keiichi Nakada, Izumi Watanabe, Junichi Horie, Kei Ueyama, Hiromu Kikawa, Masamichi Yamada
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Publication number: 20050268713Abstract: A flow rate sensor has a problem that a resistance value of a heat generating resistor itself varies and sensor characteristics are changed during use of the sensor for a long term. Also, the temperature of the heat generating resistor must be adjusted on a circuit substrate with a resistance constituting one side of a fixed temperature difference control circuit, and this has been one of factors pushing up the production cost. All resistances used for fixed temperature difference control are formed on the same substrate as temperature sensitive resistors of the same material. This enables all the resistances for the fixed temperature difference control to be exposed to the same environmental conditions. Hence, even when the resistances change over time, the changes over time occur substantially at the same tendency. Since the resistances for the fixed temperature difference control change over time essentially at the same rate, a resulting output error is very small.Type: ApplicationFiled: July 25, 2005Publication date: December 8, 2005Inventors: Izumi Watanabe, Junichi Horie, Keiichi Nakada, Kei Ueyama, Masamichi Yamada
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Publication number: 20050204810Abstract: The present invention provides an air flow measuring device comprising a housing with a sub-passage having a inlet and a outlet for air flow formed in the housing, the sub-passage further having a predefined curvature with a maximum downstream point and a flow measuring element located in the sub-passage at a position at least further downstream from the point.Type: ApplicationFiled: May 24, 2005Publication date: September 22, 2005Inventors: Hiromu Kikawa, Izumi Watanabe, Shinya Igarashi, Keiichi Nakada, Kei Ueyama
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Patent number: 6935172Abstract: A thermal type flow measuring device comprises a heating resistor(HF), a temperature measuring resistor(Ru) upstream of the heating resistor(HF) with respect to a fluid(Q), and a temperature measuring resistor(Rd) downstream of the heating resistor(HF). A heat sensitive resistance element(CF), the upstream temperature measuring resistor(Ru) and the downstream temperature measuring resistor(Rd) form a first bridge circuit, and this first bridge circuit and the heating resistor(HF) form a second bridge circuit. Feedback control means(OP1, Tr) heat the heating resistor(HF) in accordance with an output for keeping a balance of the second bridge circuit.Type: GrantFiled: August 14, 2001Date of Patent: August 30, 2005Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Junichi Horie, Izumi Watanabe, Shinya Igarashi, Keiichi Nakada, Kei Ueyama
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Patent number: RE42529Abstract: A thermal type flow rate measuring device can certainly prevent adhesion of water droplet onto a sensor element and thus achieve high reliability. The thermal type flow rate measuring device includes an auxiliary passage defined within a main passage for introducing a part of fluid flowing through the main passage, a sensor disposed within the auxiliary passage for detecting flow rate of the fluid and capturing means formed on an inner periphery of the auxiliary passage for capturing liquid contained in the fluid and transferring the captured liquid.Type: GrantFiled: June 3, 2005Date of Patent: July 12, 2011Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Izumi Watanabe, Junichi Horie, Keiichi Nakada, Kei Ueyama