Patents by Inventor Akira Furukawa
Akira Furukawa 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: 20170274926Abstract: Provided is a power conversion device for suppressing a variation amount of a bus current to decrease a power loss in consideration of control of detecting the bus current during operation. In control by a power conversion part in accordance with a switching signal, a voltage vector is caused to bring a mode into a power running mode at a timing of detecting the bus current when an AC rotating machine is in a power running operation state, and the voltage vector is caused to bring the mode into a regeneration mode at a timing of detecting the bus current when the AC rotating machine is in a regeneration operation state, thereby decreasing the power loss due to the variation in the bus current.Type: ApplicationFiled: October 8, 2014Publication date: September 28, 2017Applicant: Mitsubishi Electric CorporationInventors: Akira FURUKAWA, Tatsuya MORI
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Publication number: 20170272019Abstract: Provided are a power conversion device, relating to control of detecting a bus current in operation, and capable of acquiring an average current through a small amount of calculation and being implemented by an inexpensive microcomputer. A variation in a winding current flowing through a multi-phase winding of an AC rotating machine, namely, a phase current, is small at a timing at which voltage vectors on both sides of an axis having a larger inductance out of d and q axes of the AC rotating machine are output. Thus, switching signals are generated at timings at which the voltage vectors on both sides of the axis having the larger inductance out of the d and q axes are output, and the bus current is detected in accordance with the switching signals, thereby acquiring a value close to an average of the winding current.Type: ApplicationFiled: October 8, 2014Publication date: September 21, 2017Applicant: Mitsubishi Electric CorporationInventors: Tatsuya MORI, Akira FURUKAWA
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Publication number: 20170237377Abstract: A control unit for driving a motor mainly includes an input circuit for inputting various kinds of information pieces, an output circuit for driving the coil windings of the motor, an MPU for calculating a control amount based on the information from the input circuit and outputting a control signal to the output circuit; the control unit has two pieces each of the input circuit, the output circuit, and the, and can supply respective electric currents to the windings of the motor or can cut off the supply; the MPUs each have a CPU incorporated therein, a trigger circuit for a trigger signal having a predetermined period; the two CPUs synchronize at least control commands in accordance with the trigger signal and output the control commands.Type: ApplicationFiled: February 24, 2015Publication date: August 17, 2017Applicant: Mitsubishi Electric CorporationInventors: Akira FURUKAWA, Akihiko MORI, Jiro OKADA
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Patent number: 9712096Abstract: This invention is concerning obtaining a control apparatus and a control method for an AC rotary machine, with which a voltage command can be used up to a saturation voltage in each group of windings even when dimension differences exist between the groups of windings. A voltage saturation determination unit determines whether or not voltage saturation has occurred in a first winding group or a second winding group on the basis of at least one of a voltage and a current relating to the first winding group and the second winding group, and when determination is made that voltage saturation has occurred in either the first winding group or the second winding group, generates a voltage saturation determination signal for reducing a gain of at least one axial direction component on a rotational two-axis coordinate system.Type: GrantFiled: April 28, 2014Date of Patent: July 18, 2017Assignee: Mitsubishi Electric CorporationInventors: Akira Furukawa, Isao Kezobo, Tatsuya Mori
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Patent number: 9709009Abstract: A low pressure EGR regulating valve is driven by an electric actuator, and an output of the electric actuator is transmitted to an intake air throttle valve through a link device. An ECU executes a failure determination to determine presence of a failure in a case where a sensed opening degree, which is sensed with a low pressure EGR opening degree sensor, is other than an opening degree that corresponds to a maximum opening degree of the throttle valve limited by a mechanical stopper. The ECU executes the failure determination after the energization of the electric actuator is stopped in response to stopping of the engine.Type: GrantFiled: July 28, 2010Date of Patent: July 18, 2017Assignee: DENSO CORPORATIONInventors: Shinsuke Miyazaki, Akira Furukawa, Osamu Shimane, Kazushi Sasaki, Eiji Takemoto
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Patent number: 9630649Abstract: The electric power steering control device includes: a steering wheel; a torque generation unit for generating a generated torque for assisting a torque generated by steering by a driver; a torque detection unit for detecting a torsion generated between the steering wheel side and the torque generation unit side as a detected torque; an assist torque command calculation unit for calculating, based on the detected torque, an assist torque command for assisting the steering by the driver; and a differential rotational speed calculation unit for calculating a difference in a rotational speed generated between the steering wheel side and the torque generation unit side as a differential rotational speed, in which the torque generation unit generates the generated torque based on a compensation torque, which is set depending on the assist torque command and the differential rotational speed.Type: GrantFiled: May 15, 2013Date of Patent: April 25, 2017Assignee: Mitsubishi Electric CorporationInventors: Yoshihiko Kimpara, Akira Furukawa
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Publication number: 20170033724Abstract: A control device for an AC rotating machine includes an electric-power converter that has two or more switching devices connected with an AC rotating machine and applies a voltage to the AC rotating machine, a switch that opens or closes an electric connection path between the AC rotating machine and the electric-power converter, a switching device controller that controls opening and closing of the switching devices, and a switch controller that controls opening and closing of the switch; when a failure occurs in the electric-power converter, the AC rotating machine, or the electric connection path therebetween, the switch controller controls opening and closing of the switch in accordance with rotation information on the AC rotating machine.Type: ApplicationFiled: March 19, 2014Publication date: February 2, 2017Applicant: Mitsubishi Electric CorporationInventors: Isao KEZOBO, Tatsuya MORI, Yoshihiko KIMPARA, Shunsuke NAKAJIMA, Akira FURUKAWA
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Publication number: 20170019048Abstract: This invention is concerning obtaining a control apparatus and a control method for an AC rotary machine, with which a voltage command can be used up to a saturation voltage in each group of windings even when dimension differences exist between the groups of windings. A voltage saturation determination unit determines whether or not voltage saturation has occurred in a first winding group or a second winding group on the basis of at least one of a voltage and a current relating to the first winding group and the second winding group, and when determination is made that voltage saturation has occurred in either the first winding group or the second winding group, generates a voltage saturation determination signal for reducing a gain of at least one axial direction component on a rotational two-axis coordinate system.Type: ApplicationFiled: April 28, 2014Publication date: January 19, 2017Applicant: Mitsubishi Electric CorporationInventors: Akira FURUKAWA, Isao KEZOBO, Tatsuya MORI
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Publication number: 20160373050Abstract: A control apparatus for an AC rotary machine includes voltage application units 3, 4 for applying voltages respectively to two sets of three-phase windings of AC rotary machine 1, control unit 5 that controls the voltage application units 3, 4, and fault detection units 6, 7 that output fault detection signals to control unit 5 varying in accordance with the ground short fault and the power short fault. When detecting, control unit 5 outputs a voltage command to faulty voltage application unit 3, 4 to set voltages of respective phases of the three-phase windings at a negative electrode side potential V? of DC power supply 2, and when detecting a power short fault, control unit 5 outputs a voltage command to set the voltages of the respective phases of the three-phase windings at a positive electrode side potential V+ of DC power supply 2.Type: ApplicationFiled: April 23, 2014Publication date: December 22, 2016Applicant: Mitsubishi Electric CorporationInventors: Tatsuya MORI, Isao KEZOBO, Yoshihiko KIMPARA, Masaya SAKAI, Akira FURUKAWA, Yu KAWANO, Rei ARAKI
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Publication number: 20160329850Abstract: This invention is concerning a control apparatus for an AC rotary machine including: an AC rotary machine that includes a first winding and a second winding which have a phase difference; a first current detection unit that detects a current of the first winding; a second current detection unit that detects a current of the second winding; a control unit that calculates a first voltage command and a second voltage command on the basis of a detected current value; and a first detectability determination unit that determines a detectability of the current of the first winding, detected by the first current detection unit, on the basis of at least one of the first voltage command and the second voltage command, wherein the control unit calculates the first voltage command and the second voltage command on the basis of the detected current value of the second winding when the current of the first winding is undetectable.Type: ApplicationFiled: February 21, 2014Publication date: November 10, 2016Applicant: Mitsubishi Electric CorporationInventors: Tatsuya MORI, Isao KEZOBO, Yoshihiko KIMPARA, Akira FURUKAWA
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Patent number: 9397592Abstract: There is provided a motor control device for controlling a motor including plural sets of windings, which is configured so that, when a fault detection means detects a fault, inverters in the normal side other than in the fault side are continued to be controlled by normal-time current control means and further, inverters in the fault side are continued to be controlled by fault-time voltage commands generated by a fault-time current control means configured with a fault-time normal-side command generator and a fault-time fault-side command generator, so as to emphasis a torque ripple of the motor when a winding fault of the motor or an inverter fault occurs, to thereby cause a user to surely recognize the fault.Type: GrantFiled: January 27, 2012Date of Patent: July 19, 2016Assignee: Mitsubishi Electric CorporationInventors: Isao Kezobo, Kosuke Nakano, Yoshihito Asao, Akira Furukawa
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Publication number: 20160200352Abstract: Provided is a control device for a rotary machine including: a power feed unit configured to feed electric power in accordance with a power feed command to a rotary machine; a rotation-state detecting unit configured to detect a rotation state of the rotary machine; a torque detecting unit configured to detect an output torque output from the rotary machine; an abnormality determining unit configured to determine an abnormality in the rotation-state detecting unit or the torque detecting unit; and an excitation-command generating unit configured to generate an excitation command for oscillating the rotary machine, in which the power feed command is generated based at least on the excitation command, and the abnormality determining unit is configured to determine the abnormality in the detecting units based on a response of the rotation state and a response of the output torque to the excitation command.Type: ApplicationFiled: November 13, 2013Publication date: July 14, 2016Applicant: Mitsubishi Electric CorporationInventors: Isao KEZOBO, Yoshihiko KIMPARA, Akira FURUKAWA
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Publication number: 20160204726Abstract: A control apparatus for an AC rotary machine includes a current detection unit that detects a current of a first winding and a current of a second winding, a basic voltage calculation unit that calculates a basic voltage on the basis of a current command value, a first voltage calculation unit that calculates a voltage command value of the first winding on the basis of the current command value, the basic voltage, and the current of the first winding, and a second voltage calculation unit that calculates a voltage command value of the second winding on the basis of the current command value, the basic voltage, and the current of the second winding. At least the first voltage calculation unit calculates the voltage command value of the first winding by further taking into account the current of the second winding.Type: ApplicationFiled: November 8, 2013Publication date: July 14, 2016Applicant: Mitsubishi Electric CorporationInventors: Tatsuya MORI, Akira FURUKAWA, Yoshihiko KIMPARA, Isao KEZOBO
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Publication number: 20160190972Abstract: A power conversion device includes an alternating current rotating machine having a multiple of multi-phase windings, a multiple of power conversion means that convert direct current voltage of a direct current power supply based on a multiple of switching signals and apply voltage to the multiple of multi-phase windings, first current detection means that detects a first bus current, which is current flowing between the power conversion means that applies voltage to one multi-phase windings of the multiple of multi-phase windings and the direct current power supply, and first phase current calculation means that calculates the current flowing through the one multi-phase windings based on the first bus current, wherein the first current detection means detects the first bus current at a timing at which a multiple of voltage vectors based on the multiple of switching signals neighbor or coincide.Type: ApplicationFiled: November 11, 2013Publication date: June 30, 2016Applicant: Mitsubishi Electric CorporationInventors: Tatsuya MORI, Akira FURUKAWA
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Patent number: 9344019Abstract: Provided is a control device for an AC rotating machine, for controlling the AC rotating machine including a plurality of sets of windings. The control device includes: a plurality of inverters each including, in respective phases, switching elements for controlling voltages to be applied to respective phases of the windings; current control portion for issuing voltage commands corresponding to the voltages to the respective inverters to control currents flowing through the windings; and failure detection portion for detecting at least one of a short-circuit failure or an open-circuit failure in each of the switching elements. The current control portion sets, in accordance with the failure detected by the failure detection portion, the same potential side of the respective phases of a faulty-side inverter in the same state as in the detected failure, and continues control on a normal-side inverter except for the faulty-side inverter.Type: GrantFiled: May 11, 2012Date of Patent: May 17, 2016Assignee: Mitsubishi Electric CorporationInventors: Akira Furukawa, Yoshihiko Kimpara, Jiro Okada
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Publication number: 20160031477Abstract: The electric power steering control device includes: a steering wheel; a torque generation unit for generating a generated torque for assisting a torque generated by steering by a driver; a torque detection unit for detecting a torsion generated between the steering wheel side and the torque generation unit side as a detected torque; an assist torque command calculation unit for calculating, based on the detected torque, an assist torque command for assisting the steering by the driver; and a differential rotational speed calculation unit for calculating a difference in a rotational speed generated between the steering wheel side and the torque generation unit side as a differential rotational speed, in which the torque generation unit generates the generated torque based on a compensation torque, which is set depending on the assist torque command and the differential rotational speed.Type: ApplicationFiled: May 15, 2013Publication date: February 4, 2016Applicant: Mitsubishi Electric CorporationInventors: Yoshihiko KIMPARA, Akira FURUKAWA
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Publication number: 20160000979Abstract: There is provided a bioactive implant that has good bioactivity and can firmly maintain adhesion between a metal substrate or a plastic substrate and an apatite layer and abrasion resistance for an extended period of time. The bioactive implant has the apatite layer containing at least crystalline calcium apatite fine particles, an aqueous urethane resin, and a self-emulsifiable isocyanate compound, on the surface of the metal substrate or the plastic substrate.Type: ApplicationFiled: February 14, 2014Publication date: January 7, 2016Applicant: MITSUBISHI PAPER MILLS LIMITEDInventor: Akira FURUKAWA
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Patent number: 9225279Abstract: A control apparatus for AC rotating machine includes: a voltage command calculation means for calculating voltage commands on two rotational axes; a first voltage application means for applying voltages to first windings of a multiple-winding AC rotating machine having at least the first windings and second windings based on the voltage commands on two rotational axes output by the voltage command calculation means; and a second voltage application means for applying voltages to the second windings based on the voltage commands on two rotational axes output by the voltage command calculation means, wherein the second voltage application means applies voltages to the second windings based on the deviations between the currents fed to the first windings and the currents fed to the second windings.Type: GrantFiled: May 22, 2012Date of Patent: December 29, 2015Assignee: Mitsubishi Electric CorporationInventors: Yoshihiko Kimpara, Akira Furukawa, Shunsuke Nakajima, Jiro Okada
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Publication number: 20140368150Abstract: Provided is a control device for an AC rotating machine, for controlling the AC rotating machine including a plurality of sets of windings. The control device includes: a plurality of inverters each including, in respective phases, switching elements for controlling voltages to be applied to respective phases of the windings; current control portion for issuing voltage commands corresponding to the voltages to the respective inverters to control currents flowing through the windings; and failure detection portion for detecting at least one of a short-circuit failure or an open-circuit failure in each of the switching elements. The current control portion sets, in accordance with the failure detected by the failure detection portion, the same potential side of the respective phases of a faulty-side inverter in the same state as in the detected failure, and continues control on a normal-side inverter except for the faulty-side inverter.Type: ApplicationFiled: May 11, 2012Publication date: December 18, 2014Inventors: Akira Furukawa, Yoshihiko Kimpara, Jiro Okada
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Patent number: 8901696Abstract: A solid-state imaging device includes: photoelectric conversion units disposed in the form of matrix in an imaging region and a peripheral region around the imaging region; transfer electrodes provided on a side of the photoelectric conversion units arranged in the vertical direction of the matrix; and first-layer wirings and second-layer wirings in a multi-layer wiring structure disposed to connect the transfer electrodes in the horizontal direction of the matrix, wherein the first-layer wirings and the second-layer wirings are provided as light-shielding patterns for covering the photoelectric conversion units in the peripheral region.Type: GrantFiled: August 9, 2011Date of Patent: December 2, 2014Assignee: Sony CorporationInventors: Masashi Takami, Ryoma Yoshinaga, Akira Furukawa