Patents by Inventor Shunsuke Nakajima
Shunsuke Nakajima 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: 11927225Abstract: A sliding spline shaft device of the present invention includes a male spline and a female spline that is fitted to the male spline in an axially slidable manner, and at least one of the splines has a surface processed layer. The surface processed layer includes an undercoat layer, an intermediate layer containing phosphate, and a topcoat layer containing solid lubricant, in this order. The undercoat layer contains iron nitride and/or iron carbide. Thus, the surface of a base material has high hardness. As a result, microscopic deformation of the sliding surface is reduced, and increase in a real contact area is suppressed, whereby stick-slip is prevented.Type: GrantFiled: April 12, 2019Date of Patent: March 12, 2024Assignees: NISSAN MOTOR CO., LTD., NIHON PARKERIZING CO., LTD.Inventors: Shigetoshi Kashiwabara, Kunio Katada, Shunsuke Hiraiwa, Akihumi Kawaguchi, Takeo Nishijima, Shinichi Suzuki, Yasuyuki Katsumada, Makoto Nakajima, Tokunori Kodama, Masato Ito, Aiki Iwasa
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Publication number: 20240043000Abstract: A target trajectory computation device includes: an in-the-same-path determination unit that determines, on the basis of dividing line information and preceding vehicle information, presence or absence of a preceding vehicle traveling on the same path as a vehicle; and a target-trajectory setting unit that, in a case where a dividing-line-information acquisition unit can acquire dividing line information on only one of a left dividing line and a right dividing line, computes a target trajectory on the basis of the acquired dividing line information on the one dividing line when the in-the-same-path determination unit determines that there is a preceding vehicle traveling on the same path, and omits to compute the target trajectory when it is determined that there is no preceding vehicle traveling on the same path.Type: ApplicationFiled: January 22, 2021Publication date: February 8, 2024Applicant: Mitsubishi Electric CorporationInventors: Yusuke MATSUO, Munenori YAMAMOTO, Hiroyuki KOBAYASHI, Shunsuke NAKAJIMA
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Publication number: 20230034231Abstract: The vehicle steering system includes: a predicted lateral deviation fluctuation amount calculation circuitry to calculate a predicted lateral deviation fluctuation amount predicted as a lateral deviation fluctuation amount with respect to the target traveling line of the vehicle; and a steering control amount limiting circuitry to output a limited steering control amount to which the steering control amount is limited by the steering control amount limit value on the basis of a steering force and the predicted lateral deviation fluctuation amount, and in a case where the absolute value of the steering force is the same, when the absolute value of the predicted lateral deviation fluctuation amount is large, the steering control amount limiting circuitry sets the steering control amount limit value to a value larger than or equal to that when the absolute value of the predicted lateral deviation fluctuation amount is small.Type: ApplicationFiled: May 27, 2020Publication date: February 2, 2023Applicant: Mitsubishi Electric CorporationInventors: Shunsuke NAKAJIMA, Kenta TOMINAGA, Michihiro OGATA
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Patent number: 11005402Abstract: A control device for a motor, comprising: a power converter for performing ON/OFF control on an upper switching element and a lower switching element in accordance with a drive command from a current controller, and thereby supplying power to a motor; a current sensor provided to the lower switching element; and a fault determining unit for determining a fault in the current sensor. When the lower switching element for each phase is OFF, the current sensor detects the current error in each phase. The fault determining unit obtains a current error determination value on the basis of the value obtained by converting, to Cartesian coordinates, the current error for each phase or the magnitude of the sum of current error vectors for each phase in which the value for the current error for each phase is held as the magnitude, and determines a fault.Type: GrantFiled: May 2, 2017Date of Patent: May 11, 2021Assignee: Mitsubishi Electric CorporationInventors: Yuya Tsuchimoto, Isao Kezobo, Shunsuke Nakajima, Akira Furukawa
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Publication number: 20200385018Abstract: A path generation device and a vehicle control system capable of inhibiting generation of paths that make a vehicle unstable are provided. The path generation device includes a path generator that generates a plurality of paths along which a vehicle is to travel, in association with each piece of environment measurement data about a travel environment of the vehicle detected by a plurality of detectors; a reliability setting part that sets, for each of the generated paths, the reliability of the path in itself, the reliability corresponding to the degree to which a variation in the path falls within a predetermined range, and a path-weight setting part that sets the weight of each path on the basis of the reliability of the path.Type: ApplicationFiled: March 23, 2018Publication date: December 10, 2020Applicant: Mitsubishi Electric CorporationInventors: Shota KAMEOKA, Tomoki UNO, Shunsuke NAKAJIMA
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Publication number: 20200119674Abstract: A control device for a motor, comprising: a power converter for performing ON/OFF control on an upper switching element and a lower switching element in accordance with a drive command from a current controller, and thereby supplying power to a motor; a current sensor provided to the lower switching element; and a fault determining unit for determining a fault in the current sensor. When the lower switching element for each phase is OFF, the current sensor detects the current error in each phase. The fault determining unit obtains a current error determination value on the basis of the value obtained by converting, to Cartesian coordinates, the current error for each phase or the magnitude of the sum of current error vectors for each phase in which the value for the current error for each phase is held as the magnitude, and determines a fault.Type: ApplicationFiled: May 2, 2017Publication date: April 16, 2020Applicant: Mitsubishi Electric CorporationInventors: Yuya TSUCHIMOTO, Isao KEZOBO, Shunsuke NAKAJIMA
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Patent number: 10583859Abstract: When the state where steering torque detected by a torque detection unit is normal and the value of the steering torque is the same as or larger than a threshold value continues, an assist command generation unit that generates an assist command corresponding to steering torque produced by a driver limits the assist command; a failure determination unit includes a first failure determination unit that performs determination on a failure regardless of the limitation of the assist command and a second failure determination unit that performs determination on a failure while the assist command is limited, and stops driving of a motor when the second failure determination unit determines that there exists a failure.Type: GrantFiled: December 2, 2015Date of Patent: March 10, 2020Assignee: Mitsubishi Electric CorporationInventors: Yuya Tsuchimoto, Isao Kezobo, Shunsuke Nakajima
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Patent number: 10549776Abstract: A coordinate obtaining unit of an automatic steering control apparatus obtains a subject-vehicle coordinate point indicating a current position of a subject vehicle, and a target coordinate point indicating a target position of the subject vehicle. A subject-vehicle state quantity obtaining unit obtains a subject-vehicle state quantity indicating a traveling state of the subject vehicle. A target trajectory determining unit calculates an interpolation coordinate point for interpolating between the subject-vehicle coordinate point and the target coordinate point or between a target coordinate point previously obtained and a target coordinate point subsequently obtained, and determines a target trajectory of the subject vehicle based on the interpolation coordinate point. A steering controller controls a steering control device of the subject vehicle so that the subject vehicle travels following the target trajectory, based on the subject-vehicle state quantity and the target trajectory.Type: GrantFiled: January 11, 2018Date of Patent: February 4, 2020Assignee: Mitsubishi Electric CorporationInventors: Tetsuharu Hamada, Shunsuke Nakajima, Rei Yoshino
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Patent number: 10543868Abstract: When an AC rotary machine having a rotor structure for generating saliency, and including first three-phase windings and second three-phase windings is controlled, a first position estimation command to be superimposed on a voltage command or a current command directed to each of the first three-phase windings and a second position estimation command to be superimposed on a voltage command or a current command directed to each of the second three-phase windings are set to have the same frequency, and caused to have a phase difference, thereby increasing an estimation accuracy of a rotation position of the AC rotary machine.Type: GrantFiled: May 27, 2015Date of Patent: January 28, 2020Assignee: Mitsubishi Electric CorporationInventors: Tatsuya Mori, Shunsuke Nakajima, Isao Kezobo
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Patent number: 10532769Abstract: A vehicle steering system includes: a steering input unit that is steered by a driver; a steering force detector to detect steering force input into the steering input unit; a first steering control amount calculator to calculate a first steering control amount for bringing the vehicle close to the target traveling line; a steering control amount correction coefficient calculator to calculate a steering control amount correction coefficient for correcting a steering control amount based on the steering force; a second steering control amount calculator to calculate a second steering control amount based on the first steering control amount and the steering control amount correction coefficient; and a steering controller that steers and controls the vehicle based on the second steering control amount.Type: GrantFiled: November 30, 2017Date of Patent: January 14, 2020Assignee: Mitsubishi Electric CorporationInventors: Masataka Shirozono, Shunsuke Nakajima, Yasuyoshi Hori
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Patent number: 10439535Abstract: This invention is concerning a control device of an AC rotating machine that estimates, as an estimated rotational position, a rotational position of an AC rotating machine having N sets of three-phase windings where N is a natural number equal to or greater than 2, the device being made up of: a voltage sum calculator that calculates a voltage sum from N sets of voltage commands for applying AC voltage to the N sets of three-phase windings; a current sum calculator that calculates a current sum from N sets of currents respectively flowing in the N sets of three-phase windings; and a rotational position estimator that calculates an estimated rotational position on the basis of calculation results of the voltage sum calculator and the current sum calculator.Type: GrantFiled: April 27, 2015Date of Patent: October 8, 2019Assignee: Mitsubishi Electric CorporationInventors: Tatsuya Mori, Shunsuke Nakajima, Isao Kezobo
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Patent number: 10259492Abstract: An inverter system failure is detected on the basis of the currents of respective phases detected by a current detection unit when carrying out switching control in accordance with a first drive mode in which all switching elements on a lower-side arm are switched on and all switching elements on an upper-side arm are switched off, and the currents of respective phases detected by the current detection unit when carrying out switching control in accordance with a second drive mode in which all of the switching elements on the upper-side arm are switched on and all of the switching elements on the lower-side arm are switched off.Type: GrantFiled: November 4, 2014Date of Patent: April 16, 2019Assignee: Mitsubishi Electric CorporationInventors: Isao Kezobo, Yoshihiko Kimpara, Shunsuke Nakajima
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Publication number: 20180339728Abstract: A coordinate obtaining unit of an automatic steering control apparatus obtains a subject-vehicle coordinate point indicating a current position of a subject vehicle, and a target coordinate point indicating a target position of the subject vehicle. A subject-vehicle state quantity obtaining unit obtains a subject-vehicle state quantity indicating a traveling state of the subject vehicle. A target trajectory determining unit calculates an interpolation coordinate point for interpolating between the subject-vehicle coordinate point and the target coordinate point or between a target coordinate point previously obtained and a target coordinate point subsequently obtained, and determines a target trajectory of the subject vehicle based on the interpolation coordinate point. A steering controller controls a steering control device of the subject vehicle so that the subject vehicle travels following the target trajectory, based on the subject-vehicle state quantity and the target trajectory.Type: ApplicationFiled: January 11, 2018Publication date: November 29, 2018Applicant: Mitsubishi Electric CorporationInventors: Tetsuharu HAMADA, Shunsuke NAKAJIMA, Rei YOSHINO
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Patent number: 10116250Abstract: When there is an error between an actual resistance value of an AC rotary machine (ACRM) and an estimated resistance value estimated from a detected external temperature of the ACRM, the ACRM cannot be rotated smoothly. In view of this, provided are a control device for an ACRM and the like, including a resistance value estimation unit (10) configured to calculate an estimated resistance value (Rest) by adding to a basic estimated resistance value (Rest0), which is a value obtained by estimating a resistance value from a detected external temperature of the ACRM, an estimated resistance correction value (Radd), which is determined such that a range that can be taken by an error (?R) of the resistance value estimated in advance falls within a range of the error of the resistance value that enables the ACRM to be rotated smoothly.Type: GrantFiled: June 16, 2014Date of Patent: October 30, 2018Assignee: Mitsubishi Electric CorporationInventors: Yuya Tsuchimoto, Isao Kezobo, Yoshihiko Kimpara, Shunsuke Nakajima
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Publication number: 20180294755Abstract: This invention is concerning a control device of an AC rotating machine that estimates, as an estimated rotational position, a rotational position of an AC rotating machine having N sets of three-phase windings where N is a natural number equal to or greater than 2, the device being made up of: a voltage sum calculator that calculates a voltage sum from N sets of voltage commands for applying AC voltage to the N sets of three-phase windings; a current sum calculator that calculates a current sum from N sets of currents respectively flowing in the N sets of three-phase windings; and a rotational position estimator that calculates an estimated rotational position on the basis of calculation results of the voltage sum calculator and the current sum calculator.Type: ApplicationFiled: April 27, 2015Publication date: October 11, 2018Applicant: Mitsubishi Electric CorporationInventors: Tatsuya MORI, Shunsuke NAKAJIMA, Isao KEZOBO
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Publication number: 20180257701Abstract: When the state where steering torque detected by a torque detection unit is normal and the value of the steering torque is the same as or larger than a threshold value continues, an assist command generation unit that generates an assist command corresponding to steering torque produced by a driver limits the assist command; a failure determination unit includes a first failure determination unit that performs determination on a failure regardless of the limitation of the assist command and a second failure determination unit that performs determination on a failure while the assist command is limited, and stops driving of a motor when the second failure determination unit determines that there exists a failure.Type: ApplicationFiled: December 2, 2015Publication date: September 13, 2018Applicant: Mitsubishi Electric CorporationInventors: Yuya TSUCHIMOTO, Isao KEZOBO, Shunsuke NAKAJIMA
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Publication number: 20180170431Abstract: A vehicle steering system includes: a steering input unit that is steered by a driver; a steering force detector to detect steering force input into the steering input unit; a first steering control amount calculator to calculate a first steering control amount for bringing the vehicle close to the target traveling line; a steering control amount correction coefficient calculator to calculate a steering control amount correction coefficient for correcting a steering control amount based on the steering force; a second steering control amount calculator to calculate a second steering control amount based on the first steering control amount and the steering control amount correction coefficient; and a steering controller that steers and controls the vehicle based on the second steering control amount.Type: ApplicationFiled: November 30, 2017Publication date: June 21, 2018Applicant: Mitsubishi Electric CorporationInventors: Masataka SHIROZONO, Shunsuke NAKAJIMA, Yasuyoshi HORI
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Publication number: 20180105201Abstract: When an AC rotary machine having a rotor structure for generating saliency, and including first three-phase windings and second three-phase windings is controlled, a first position estimation command to be superimposed on a voltage command or a current command directed to each of the first three-phase windings and a second position estimation command to be superimposed on a voltage command or a current command directed to each of the second three-phase windings are set to have the same frequency, and caused to have a phase difference, thereby increasing an estimation accuracy of a rotation position of the AC rotary machine.Type: ApplicationFiled: May 27, 2015Publication date: April 19, 2018Applicant: Mitsubishi Electric CorporationInventors: Tatsuya MORI, Shunsuke NAKAJIMA, Isao KEZOBO
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Patent number: 9912274Abstract: This AC rotating machine control device includes: power limiting means 6 for limiting drive power supplied for driving the AC rotating machine; and power feed means 10 for, when sensor abnormality determination means 3 determines that the rotational position sensor is abnormal, on the basis of the estimated rotational position, supplying the AC rotating machine with power obtained by adding rotational position estimation power supplied for the rotational position estimation means 9 to estimate the rotational position, to the drive power limited by the power limiting means, wherein the power limiting means 6 limits drive current at least during a predetermined period since the sensor abnormality determination means 3 determines that the abnormality occurs until estimated error of the estimated rotational position falls within a predetermined range.Type: GrantFiled: April 29, 2014Date of Patent: March 6, 2018Assignee: Mitsubishi Electric CorporationInventors: Shunsuke Nakajima, Yuya Tsuchimoto, Isao Kezobo, Yoshihiko Kimpara
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Patent number: 9876458Abstract: 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: GrantFiled: March 19, 2014Date of Patent: January 23, 2018Assignee: Mitsubishi Electric CorporationInventors: Isao Kezobo, Tatsuya Mori, Yoshihiko Kimpara, Shunsuke Nakajima, Akira Furukawa