Patents by Inventor Eiji Iwami
Eiji Iwami 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: 11173951Abstract: Provided is an electric power steering device including a phase compensation unit having a desirable phase compensation characteristic for each vehicle speed region, which suppresses deterioration in stability of a steering system in a case where the phase compensation characteristic is changed to a different phase compensation characteristic, in which the phase compensation unit includes: a plurality of phase compensation calculation units configured to execute phase compensation calculation based on each phase compensation characteristic; a phase compensation characteristic determination unit configured to determine a phase compensation characteristic based on a vehicle speed signal output from a vehicle speed sensor; and a selection unit configured to select a phase-compensated torque signal output by the phase compensation unit from phase compensation calculation results output by the plurality of phase compensation calculation units in consideration of an amount of change in phase compensation calculatioType: GrantFiled: November 6, 2017Date of Patent: November 16, 2021Assignee: Mitsubishi Electric CorporationInventors: Yasuaki Hori, Kenta Kawahara, Katsuya Ikemoto, Eiji Iwami, Hideki Doi
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Patent number: 10970147Abstract: An abnormality determination means performs detection of abnormality of one of the pairs of detection means at a normal speed, and performs detection of abnormality of the other of the pairs at a speed not higher than the normal speed, and, when a sign of abnormality of the detection means is detected at the normal speed, a CPU performs switching to the other normal pair and continues control, and the abnormality determination means performs detection of abnormality of the other normal pair at the normal speed, and meanwhile, continues to perform detection of abnormality of the abnormal pair at a speed not higher than the normal speed.Type: GrantFiled: May 24, 2016Date of Patent: April 6, 2021Assignee: Mitsubishi Electric CorporationInventors: Eiji Iwami, Munenori Yamamoto
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Publication number: 20200391786Abstract: Provided is an electric power steering device including a phase compensation unit having a desirable phase compensation characteristic for each vehicle speed region, which suppresses deterioration in stability of a steering system in a case where the phase compensation characteristic is changed to a different phase compensation characteristic, in which the phase compensation unit includes: a plurality of phase compensation calculation units configured to execute phase compensation calculation based on each phase compensation characteristic; a phase compensation characteristic determination unit configured to determine a phase compensation characteristic based on a vehicle speed signal output from a vehicle speed sensor; and a selection unit configured to select a phase-compensated torque signal output by the phase compensation unit from phase compensation calculation results output by the plurality of phase compensation calculation units in consideration of an amount of change in phase compensation calculatioType: ApplicationFiled: November 6, 2017Publication date: December 17, 2020Applicant: Mitsubishi Electric CorporationInventors: Yasuaki HORI, Kenta KAWAHARA, Katsuya IKEMOTO, Eiji IWAMI, Hideki DOI
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Patent number: 10836423Abstract: In an electric power steering device including a controller, which is configured to carry out feedback control for a motor including independent two coil winding groups and being configured to rotate a steering mechanism of a vehicle, when one of the two groups recovers from a failure that has occurred in the one group while control is continued solely by another group due to the failure, the controller resumes cooperative control by the two groups, and when starting the cooperative control, sets target current values of the one group and the another group to values different from a final target current value based on an actual current value or a target current value of the another group at a time of the recovery, to thereby output respective control amounts for the cooperative control.Type: GrantFiled: October 22, 2015Date of Patent: November 17, 2020Assignee: Mitsubishi Electric CorporationInventors: Akira Furukawa, Akihiko Mori, Eiji Iwami
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Patent number: 10536102Abstract: A main controller includes: a d-axis current limiter configured to calculate a d-axis current limiting value with priority, based on a dq-converted current limiting value, and calculate a limited d-axis current command value by clipping the d-axis current command value to be the d-axis current limiting value or less; a q-axis current limiter configured to calculate a q-axis current limiting value, based on the dq-converted current limiting value and the limited d-axis current command value, and calculate a limited q-axis current command value by clipping the q-axis current command value to be the q-axis current limiting value or less; and an inverter controller configured to control motor current, based on the limited d-axis current command value and the limited q-axis current command value.Type: GrantFiled: May 1, 2015Date of Patent: January 14, 2020Assignee: Mitsubishi Electric CorporationInventors: Hiroyuki Kishioka, Susumu Zeniya, Takashi Goto, Daisuke Tanaka, Akiyoshi Takashima, Eiji Iwami
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Patent number: 10396544Abstract: A magnetic core is electromagnetically coupled to two conductors that allow an AC current to flow through. An exciter is configured to supply a winding with an excitation current that is an alternating current. A current detector is configured to detect a current flowing through the winding. A DC component detector is configured to detect a DC component level from the current detected with the current detector. Two contact elements are respectively disposed along the two conductors. A discrimination controller is configured to: turn the two contact elements on when the DC component level detected with the DC component detector is less than or equal to a threshold; turn the two contact elements off when the DC component level detected with the DC component detector is greater than the threshold; and turn the two contact elements off in de-energized condition.Type: GrantFiled: March 25, 2016Date of Patent: August 27, 2019Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Eiji Iwami, Tsuyoshi Ikushima, Naoki Fukuo, Tomokazu Nishigaki
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Publication number: 20190073256Abstract: An abnormality determination means performs detection of abnormality of one of the pairs of detection means at a normal speed, and performs detection of abnormality of the other of the pairs at a speed not higher than the normal speed, and, when a sign of abnormality of the detection means is detected at the normal speed, a CPU performs switching to the other normal pair and continues control, and the abnormality determination means performs detection of abnormality of the other normal pair at the normal speed, and meanwhile, continues to perform detection of abnormality of the abnormal pair at a speed not higher than the normal speed.Type: ApplicationFiled: May 24, 2016Publication date: March 7, 2019Applicant: Mitsubishi Electric CorporationInventors: Eiji IWAMI, Munenori YAMAMOTO
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Publication number: 20180237058Abstract: In an electric power steering device including a controller, which is configured to carry out feedback control for a motor including independent two coil winding groups and being configured to rotate a steering mechanism of a vehicle, when one of the two groups recovers from a failure that has occurred in the one group while control is continued solely by another group due to the failure, the controller resumes cooperative control by the two groups, and when starting the cooperative control, sets target current values of the one group and the another group to values different from a final target current value based on an actual current value or a target current value of the another group at a time of the recovery, to thereby output respective control amounts for the cooperative control.Type: ApplicationFiled: October 22, 2015Publication date: August 23, 2018Applicant: Mitsubishi Electric CorporationInventors: Akira FURUKAWA, Akihiko MORI, Eiji IWAMI
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Publication number: 20180145622Abstract: A main controller includes: a d-axis current limiter configured to calculate a d-axis current limiting value with priority, based on a dq-converted current limiting value, and calculate a limited d-axis current command value by clipping the d-axis current command value to be the d-axis current limiting value or less; a q-axis current limiter configured to calculate a q-axis current limiting value, based on the dq-converted current limiting value and the limited d-axis current command value, and calculate a limited q-axis current command value by clipping the q-axis current command value to be the q-axis current limiting value or less; and an inverter controller configured to control motor current, based on the limited d-axis current command value and the limited q-axis current command value.Type: ApplicationFiled: May 1, 2015Publication date: May 24, 2018Applicant: Mitsubishi Electric CorporationInventors: Hiroyuki KISHIOKA, Susumu ZENIYA, Takashi GOTO, Daisuke TANAKA, Akiyoshi TAKASHIMA, Eiji IWAMI
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Publication number: 20180131173Abstract: A magnetic core is electromagnetically coupled to two conductors that allow an AC current to flow through. An exciter is configured to supply a winding with an excitation current that is an alternating current. A current detector is configured to detect a current flowing through the winding. A DC component detector is configured to detect a DC component level from the current detected with the current detector. Two contact elements are respectively disposed along the two conductors. A discrimination controller is configured to: turn the two contact elements on when the DC component level detected with the DC component detector is less than or equal to a threshold; turn the two contact elements off when the DC component level detected with the DC component detector is greater than the threshold; and turn the two contact elements off in de-energized condition.Type: ApplicationFiled: March 25, 2016Publication date: May 10, 2018Inventors: Eiji IWAMI, Tsuyoshi IKUSHIMA, Naoki FUKUO, Tomokazu NISHIGAKI
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Patent number: 9575127Abstract: Provided are a motor control device (1) for controlling a motor (2) having a plurality of phases, for quickly and accurately detecting a phase in which an open-state fault has occurred when the open-state fault occurs in a target phase. When a power-supply voltage (Vb) is equal to or higher than a predetermined voltage (Vthr), a motor rotation speed (?) is equal to or lower than a predetermined speed (?thr), a target x-phase voltage command (Vx*) is not in the vicinity of zero, a current (Ix) of the target x-phase is equal to or lower than a predetermined current (Iu_thr), and a state in which a control error is equal to or larger than a predetermined error is detected over a predetermined time period or longer, occurrence of an open-state fault in the target phase is determined.Type: GrantFiled: May 7, 2012Date of Patent: February 21, 2017Assignee: Mitsubishi Electric CorporationInventors: Isao Kezobo, Masahiro Iezawa, Susumu Zeniya, Eiji Iwami, Yusuke Fujiki, Hiroyuki Kishioka, Sadaaki Kamei, Yoshihiko Kimpara, Jiro Okada
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Patent number: 9052354Abstract: A magnetic field sensor includes: a magnetic thin film; a feeder comprising an input and output terminals configured to supply element current to the magnetic thin film; and a detector configured to detect a voltage between ends of the magnetic thin film in a direction perpendicular to a direction of the element current. The magnetic thin film is Rained symmetric about the direction of the element current.Type: GrantFiled: August 26, 2010Date of Patent: June 9, 2015Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Hideki Takenaga, Eiji Iwami, Tomoyuki Sawada, Hiroaki Tsujimoto, Keisuke Yoshikawa, Suguru Fukui
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Patent number: 9013122Abstract: Provided is an electric power steering control device which can realize a more appropriate countermeasure against heat in accordance with a thermal characteristic of a component used to supply a motor current. The electric power steering control device for assisting a steering force of a steering wheel of a vehicle including a control unit (10).Type: GrantFiled: July 1, 2013Date of Patent: April 21, 2015Assignee: Mitsubishi Electric CorporationInventors: Eiji Iwami, Takashi Goto, Susumu Zeniya, Daisuke Tanaka
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Publication number: 20140118866Abstract: Provided is an electric power steering control device which can realize a more appropriate countermeasure against heat in accordance with a thermal characteristic of a component used to supply a motor current. The electric power steering control device for assisting a steering force of a steering wheel of a vehicle including a control unit (10).Type: ApplicationFiled: July 1, 2013Publication date: May 1, 2014Inventors: Eiji IWAMI, Takashi Goto, Susumu Zeniya, Daisuke Tanaka
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Publication number: 20140054103Abstract: Provided are a motor control device (1) for controlling a motor (2) having a plurality of phases, for quickly and accurately detecting a phase in which an open-state fault has occurred when the open-state fault occurs in a target phase. When a power-supply voltage (Vb) is equal to or higher than a predetermined voltage (Vthr), a motor rotation speed (?) is equal to or lower than a predetermined speed (?thr), a target x-phase voltage command (Vx*) is not in the vicinity of zero, a current (Ix) of the target x-phase is equal to or lower than a predetermined current (Iu_thr), and a state in which a control error is equal to or larger than a predetermined error is detected over a predetermined time period or longer, occurrence of an open-state fault in the target phase is determined.Type: ApplicationFiled: May 7, 2012Publication date: February 27, 2014Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Isao Kezobo, Masahiro Iezawa, Susumu Zeniya, Eiji Iwami, Yusuke Fujiki, Hiroyuki Kishioka, Sadaaki Kamei, Yoshihiko Kimpara, Jiro Okada
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Publication number: 20120229131Abstract: A magnetic field sensor includes: a magnetic thin film; a feeder comprising an input and output terminals configured to supply element current to the magnetic thin film; and a detector configured to detect a voltage between ends of the magnetic thin film in a direction perpendicular to a direction of the element current. The magnetic thin film is Rained symmetric about the direction of the element current.Type: ApplicationFiled: August 26, 2010Publication date: September 13, 2012Applicant: PANASONIC CORPORATIONInventors: Hideki Takenaga, Eiji Iwami, Tomoyuki Sawada, Hiroaki Tsujimoto, Keisuke Yoshikawa, Suguru Fukui
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Patent number: 7307410Abstract: The AC detection coil is a toroidal coil and includes plural radial-line conductors which are formed on a front face and a rear face of a substrate, conductive connection parts and conductive through-holes which connect electrically each end of radial-line conductors, wherein plural winding turns are consecutively formed by a connection of each radial-line conductor on the front and the rear faces, respectively, and include a forward coil and a backward coil, and each shape on the front and the rear faces of the radial-line conductors and the conductive connection parts are identical with each other. Consequently, when seen from a thickness direction of the substrate, areas of the forward coil and the backward coil are equal to each other, and an external, unneeded to be detected, magnetic field can be canceled each other by the forward coil and the backward coil, then a current detection accuracy can be improved.Type: GrantFiled: November 21, 2006Date of Patent: December 11, 2007Assignee: Matsushita Electric Works, Ltd.Inventors: Akimi Shiokawa, Eiji Iwami, Yasuo Ichimura, Akihiro Ishibashi, Kazunari Yoshimura
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Publication number: 20070152651Abstract: The alternating current detection coil is a toroidal coil, and comprises plural radial-line conductors which are formed on a front face and a rear face of a substrate, conductive connection parts and conductive through-holes which connect electrically each end of radial-line conductors, wherein plural winding turns are consecutively formed by a connection of each radial-line conductor on the front face and the rear face respectively, the winding turns comprise a forward coil and a backward coil, and each shape on the front face and the rear face of the radial-line conductors and the conductive connection parts are identical with each other. Consequently, when seen from a thickness direction of the substrate, areas of the forward coil and the backward coil are equal to each other, and an external magnetic field, which does not need to be detected, can be canceled each other by the forward coil and the backward coil, then a current detection accuracy can be improved.Type: ApplicationFiled: November 21, 2006Publication date: July 5, 2007Applicant: MATSUSHITA ELECTRIC WORKS, LTD.Inventors: Akimi Shiokawa, Eiji Iwami, Yasuo Ichimura, Akihiro Ishibashi, Kazunari Yoshimura
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Patent number: 6992449Abstract: In an electric power steering apparatus in which a third motor target current is determined from a first motor target current determined on the basis of a detection torque from a steering torque detection means and a second motor target current determined using at least a detection value of the motor current detection circuit as one of inputs, and a motor drive signal is calculated on the basis of the third motor target current and a detection current from the motor current detection circuit to control a motor current, there is included a motor current detection circuit failure judgment means for judging a failure of the motor current detection circuit, and when a judgment of failure is made, at least the second motor target current is limited.Type: GrantFiled: October 7, 2004Date of Patent: January 31, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Eiji Iwami, Susumu Zeniya, Takayuki Kifuku
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Publication number: 20050258791Abstract: In an electric power steering apparatus in which a third motor target current is determined from a first motor target current determined on the basis of a detection torque from a steering torque detection means and a second motor target current determined using at least a detection value of the motor current detection circuit as one of inputs, and a motor drive signal is calculated on the basis of the third motor target current and a detection current from the motor current detection circuit to control a motor current, there is included a motor current detection circuit failure judgment means for judging a failure of the motor current detection circuit, and when a judgment of failure is made, at least the second motor target current is limited.Type: ApplicationFiled: October 7, 2004Publication date: November 24, 2005Inventors: Eiji Iwami, Susumu Zeniya, Takayuki Kifuku