Patents by Inventor Nobuhiko Matsuo
Nobuhiko Matsuo 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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Publication number: 20230332551Abstract: A control device for an electric variable valve timing mechanism is provided that can reduce the influence of rotation variations of an engine on a VTC detection angle computation. The control device for a variable valve timing mechanism uses a crank sensor signal and a cam sensor signal of the engine to calculate a rotation phase of the VTC mechanism. A pulse interval of the crank sensor signal is used for a calculation of the rotation phase of the VTC mechanism, and a calculation method of the rotation phase of VTC mechanism is changed depending on the pulse interval of the crank sensor signal determined before the cam sensor signal is input.Type: ApplicationFiled: September 9, 2021Publication date: October 19, 2023Inventors: Makoto JITSUISHI, Nobuhiko MATSUO
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Patent number: 11391234Abstract: In a variable valve control device, a variable valve control system and a method for controlling a variable valve mechanism according to the present invention, An ECM (201) transmits a phase detection value (RA1) computed based on a crank angle signal (CRANK) and a cam angle signal (CAM) to a VTC control unit (202) via a communication network (211), and VTC control unit (202) computes a phase detection value (RA2) based on a motor angle signal (MAS), controls a variable valve timing mechanism (114) based on phase detection value (RA2) in the transient state of an internal combustion engine, and controls variable valve timing mechanism (114) based on phase detection value (RA1) in the steady state of the internal combustion engine.Type: GrantFiled: September 18, 2018Date of Patent: July 19, 2022Assignee: Hitachi Astemo, Ltd.Inventors: Nobuhiko Matsuo, Hirokazu Shimizu
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Patent number: 11230988Abstract: A control device and a control method for variable valve timing mechanism according to the present invention obtains a first measurement of a rotational phase based on a rotational angle of the motor, obtains a second measurement of the rotational phase based on a relative relationship between a rotational angle of the crankshaft and a rotational angle of the camshaft, calibrates the first measurement based on the second measurement, obtains a derivative term proportional to a rate of change in a deviation between the first measurement and a target value, reduces change in derivative term when calibrating the first measurement based on the second measurement, and controls the motor based on a manipulated variable including the derivative term.Type: GrantFiled: February 20, 2019Date of Patent: January 25, 2022Assignee: Hitachi Astemo, Ltd.Inventors: Makoto Jitsuishi, Nobuhiko Matsuo
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Publication number: 20210340887Abstract: A control device and a control method for a variable valve timing mechanism are provided so as to improve the accuracy of cam phase angle interpolation without using a motor rotation angle sensor. The control device for the variable valve timing mechanism includes a controller configured to detect a phase angle of a cam based on a cam signal and control the phase angle of the cam by using an electric motor. The controller is configured such that a motor torque estimation unit calculates a motor torque from a motor current based on motor characteristics, a motor rotation-angle estimation unit calculates a motor rotation angle at least based on the motor torque and an engine operating state, and a conversion unit and a feedback control unit interpolate the cam phase angle of the variable valve timing mechanism from the motor rotation angle.Type: ApplicationFiled: November 13, 2019Publication date: November 4, 2021Inventors: Masaki KOSUDA, Hirokazu SHIMIZU, Nobuhiko MATSUO
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Publication number: 20210246846Abstract: A control device and a control method for variable valve timing mechanism according to the present invention obtains a first measurement of a rotational phase based on a rotational angle of the motor, obtains a second measurement of the rotational phase based on a relative relationship between a rotational angle of the crankshaft and a rotational angle of the camshaft, calibrates the first measurement based on the second measurement, obtains a derivative term proportional to a rate of change in a deviation between the first measurement and a target value, reduces change in derivative term when calibrating the first measurement based on the second measurement, and controls the motor based on a manipulated variable including the derivative term.Type: ApplicationFiled: February 20, 2019Publication date: August 12, 2021Inventors: Makoto JITSUISHI, Nobuhiko MATSUO
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Publication number: 20200277914Abstract: In a variable valve control device, a variable valve control system and a method for controlling a variable valve mechanism according to the present invention, An ECM (201) transmits a phase detection value (RA1) computed based on a crank angle signal (CRANK) and a cam angle signal (CAM) to a VTC control unit (202) via a communication network (211), and VTC control unit (202) computes a phase detection value (RA2) based on a motor angle signal (MAS), controls a variable valve timing mechanism (114) based on phase detection value (RA2) in the transient state of an internal combustion engine, and controls variable valve timing mechanism (114) based on phase detection value (RA1) in the steady state of the internal combustion engine.Type: ApplicationFiled: September 18, 2018Publication date: September 3, 2020Inventors: Nobuhiko MATSUO, Hirokazu SHIMIZU
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Patent number: 10584648Abstract: In a control device and a control method for a variable valve timing mechanism according to the present invention, the rotational phase of a camshaft is measured based on the cam angle signal and crank angle signal upon receiving each pulse of the cam angle signal, and the rotational phase change over time within a period of the cam angle signal is measured based on the motor angle signal. It is decided whether the cam angle signal and/or crank angle signal has a prescribed pulse pattern at a diagnostic timing that comes after the last pulse of the cam angle signal. When this decision result is positive, it is then decided whether the motor angle sensor operates normally or abnormally based on the rotational phase and the amount of rotational phase change that are measured when the last pulse of the cam angle signal is received before the diagnostic timing.Type: GrantFiled: January 19, 2018Date of Patent: March 10, 2020Assignee: Hitachi Automotive Systems, Ltd.Inventors: Kentaro Mikawa, Nobuhiko Matsuo, Naoki Okamoto
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Publication number: 20190360407Abstract: In a control device and a control method for a variable valve timing mechanism according to the present invention, the rotational phase of a camshaft is measured based on the cam angle signal and crank angle signal upon receiving each pulse of the cam angle signal, and the rotational phase change over time within a period of the cam angle signal is measured based on the motor angle signal. It is decided whether the cam angle signal and/or crank angle signal has a prescribed pulse pattern at a diagnostic timing that comes after the last pulse of the cam angle signal. When this decision result is positive, it is then decided whether the motor angle sensor operates normally or abnormally based on the rotational phase and the amount of rotational phase change that are measured when the last pulse of the cam angle signal is received before the diagnostic timing.Type: ApplicationFiled: January 19, 2018Publication date: November 28, 2019Applicant: Hitachi Automotive Systems, Ltd.Inventors: Kentaro MIKAWA, Nobuhiko MATSUO, Naoki OKAMOTO
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Patent number: 9791213Abstract: A heat exchanger carries out heat exchange between a refrigerant that undergoes a phase change during heat exchange and another heating medium. The heat exchanger includes headers having the refrigerant flowing through interiors, a plurality of multi-hole first flat tubes, and a plurality of second flat tubes. The first flat tubes extend in a direction intersecting a lengthwise direction of the headers. The first flat tubes have a plurality of refrigerant flow channels with the refrigerant flowing through the refrigerant flow channels. The second flat tubes are stacked alternately with respect to the first flat tubes, with the other heating medium flowing through the second flat tubes. The headers are arranged to extend along a horizontal direction.Type: GrantFiled: November 19, 2013Date of Patent: October 17, 2017Assignee: Daikin Industries, Ltd.Inventors: Shun Yoshioka, Nobuhiko Matsuo, Shougo Ohta, Kanji Akai, Kento Kagohara, Kaori Yoshida
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Patent number: 9347341Abstract: An apparatus for controlling a variable valve timing mechanism includes an electronic controller which includes a microcomputer converges a valve timing of a variable valve timing mechanism to a target changing amount based on a deviation between the target changing amount and an output of a sensor for detecting a changing amount of the valve timing.Type: GrantFiled: September 16, 2013Date of Patent: May 24, 2016Assignee: Hitachi Automotive Systems, Ltd.Inventors: Nobuhiko Matsuo, Kenichi Machida
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Publication number: 20150338168Abstract: A heat exchanger carries out heat exchange between a refrigerant that undergoes a phase change during heat exchange and another heating medium. The heat exchanger includes headers having the refrigerant flowing through interiors, a plurality of multi-hole first flat tubes, and a plurality of second flat tubes. The first flat tubes extend in a direction intersecting a lengthwise direction of the headers. The first flat tubes have a plurality of refrigerant flow channels with the refrigerant flowing through the refrigerant flow channels. The second flat tubes are stacked alternately with respect to the first flat tubes, with the other heating medium flowing through the second flat tubes. The headers are arranged to extend along a horizontal direction.Type: ApplicationFiled: November 19, 2013Publication date: November 26, 2015Inventors: Shun YOSHIOKA, Nobuhiko MATSUO, Shougo OHTA, Kanji AKAI, Kento KAGOHARA, Kaori YOSHIDA
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Patent number: 9046010Abstract: A control unit for a variable valve timing mechanism for changing a cam phase by an electric actuator determines an influence on the operation of the variable valve timing mechanism based on the engine operating conditions. Then, based on the determination result, the control unit reduces the operation amount of the electric actuator in a predetermined range of the rotation angle of a camshaft.Type: GrantFiled: March 18, 2013Date of Patent: June 2, 2015Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Nobuhiko Matsuo, Kentaro Mikawa
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Publication number: 20140076251Abstract: An apparatus for controlling a variable valve timing mechanism includes an electronic controller which includes a microcomputer converges a valve timing of a variable valve timing mechanism to a target changing amount based on a deviation between the target changing amount and an output of a sensor for detecting a changing amount of the valve timing.Type: ApplicationFiled: September 16, 2013Publication date: March 20, 2014Applicant: Hitachi Automotive Systems, Ltd.Inventors: Nobuhiko MATSUO, Kenichi MACHIDA
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Publication number: 20130247850Abstract: A control unit for a variable valve timing mechanism for changing a cam phase by an electric actuator determines an influence on the operation of the variable valve timing mechanism based on the engine operating conditions. Then, based on the determination result, the control unit reduces the operation amount of the electric actuator in a predetermined range of the rotation angle of a camshaft.Type: ApplicationFiled: March 18, 2013Publication date: September 26, 2013Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Nobuhiko MATSUO, Kentaro MIKAWA
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Publication number: 20130060452Abstract: Control apparatus and method for internal combustion engine includes a fuel injection valve that injects fuel into an intake pipe at the upstream side of intake valves. When a deposition amount VDEPO of the intake valves is estimated, and becomes greater than a second threshold value SL2, the current mode switches to a cleaning mode to clean deposits away by increasing the amount of fuel adhering to the intake valves and changing the fuel injected by the fuel injection valve to a fuel with a higher cleaning performance, or one of increasing and changing. The increasing of the amount of fuel adhering to the intake valves is achieved by the changing of the injecting timing, the increasing of the fuel pressure, the switching of the fuel injection valve, and the like. Furthermore, changing of the fuel with the higher cleaning performance is achieved by switching to additive-containing fuel.Type: ApplicationFiled: May 14, 2012Publication date: March 7, 2013Inventors: Masayuki SARUWATARI, Nobuhiko Matsuo, Tomoyuki Murakami