Patents by Inventor Yasuhito Nakakuki

Yasuhito Nakakuki 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).

  • Publication number: 20220001916
    Abstract: A steering apparatus includes a first CAN communication line provided between a steering input mechanism and a steering mechanism controller and configured to output a first steering operation amount signal output from a first steering operation amount signal output portion to the steering mechanism controller, and a communication line provided between the steering input mechanism and the steering mechanism controller and configured to output a second steering operation amount signal to the steering mechanism controller without intervention of a first microprocessor.
    Type: Application
    Filed: October 29, 2019
    Publication date: January 6, 2022
    Applicant: Hitachi Astemo, Ltd.
    Inventors: Makoto KIMURA, Yasuhito NAKAKUKI, Kohtaro SHIINO
  • Publication number: 20210206424
    Abstract: A control device for a power steering device includes a low-pass filter unit including a cutoff frequency adjustment unit configured to adjust a cutoff frequency for partially attenuating a component of an input signal, set the cutoff frequency to a first cutoff frequency when a steering torque signal is lower than a first predetermined torque value, and to set the cutoff frequency to a second cutoff frequency lower than the first cutoff frequency when the steering torque signal is equal to or higher than the first predetermined torque value.
    Type: Application
    Filed: January 31, 2019
    Publication date: July 8, 2021
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Yasuhito NAKAKUKI, Kazuya YAMANO, Atsushi ISHIKAWA
  • Patent number: 10899381
    Abstract: A steering device is provided to perform a safe transition from an automatic driving mode to a manual driving mode when necessary. When it is determined necessary to transition from the automatic driving mode to the manual driving mode during the automatic driving mode, a transition period before an end time point of the automatic driving mode is set, a driving operation reliability indicative of whether or not it is possible to perform the transition is determined, and the transition when it is determined that it is possible to perform the transition to the manual driving mode during the automatic driving mode. Consequently, the transition can be controlled so that transition is not performed instantly, such as, for example, in a case where a driver is not driving during the automatic driving mode and is not accustomed to manual driving.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: January 26, 2021
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Takahiro Itou, Kazuya Yamano, Yasuhito Nakakuki
  • Patent number: 10589787
    Abstract: It is an object of the present invention to provide a power steering apparatus control device in which it is possible to suppress generation of the canceling of the automatic steering unintended by the driver. The present invention provides a control device controlling the operation of a power steering apparatus in which there is selected either an assist control (28) in which a steering force is assisted based on a steering torque input through the operation of a steering wheel or an automatic steering control (29) in which a steering angle of a turning wheel is controlled based on a steering angle command value. When, in the state in which the automatic steering control (29) is selected, the steering torque exceeds a predetermined threshold value, the automatic steering control (29) is canceled and the assist control (28) is selected.
    Type: Grant
    Filed: June 9, 2016
    Date of Patent: March 17, 2020
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Takahiro Itou, Kenta Maeda, Kazuya Yamano, Yasuhito Nakakuki
  • Publication number: 20190276077
    Abstract: The steering control device includes an automatic steering controller that generates an automatic steering control amount and a manual steering controller that generates a manual steering control amount, and selects either one of an automatic steering mode and a manual steering mode to control an electric motor. When steering torque exceeds a predetermined value during the control in the automatic steering mode, the manual steering controller generates a manual steering control amount change based on the change in the manual operation amount with reference to the time of exceeding, generates the manual steering control amount based on the steering torque, controls the electric motor based on a control amount obtained by adding the manual steering control amount change to the automatic steering control amount at the time of exceeding, and then controls the electric motor in the manual steering mode.
    Type: Application
    Filed: November 1, 2017
    Publication date: September 12, 2019
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Takahiro ITOU, Kazuya YAMANO, Yasuhito NAKAKUKI
  • Publication number: 20190270482
    Abstract: There is provided a control device for a power steering device that provides stable steering feeling in the vicinity of a stroke end. The control device for the power steering device is configured to calculate a stopper torque that is a steering force in a direction opposite to a direction causing a turning angle to approach a stopper angle, based on a steering torque signal, when the turning angle approaches the stopper angle accompanied with a steering operation of a steering wheel, and configured to calculate a motor command signal that is used to drive a power-driven motor, based on a driving condition of a vehicle and the stopper torque.
    Type: Application
    Filed: March 15, 2017
    Publication date: September 5, 2019
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Yasuhito NAKAKUKI, Kazuya YAMANO, Masaki KODATO
  • Publication number: 20190202494
    Abstract: There is provided a novel steering device capable of perform safe transition from an automatic driving mode to a manual driving mode in a case where it is necessary to perform transition from the automatic driving mode to the manual driving mode. In a case where it is determined that it is necessary to perform transition from the automatic driving mode to the manual driving mode (S8) during the automatic driving mode (S1), a transition period Lth before an end time point of the automatic driving mode (S1) is set, the driving operation reliability (S5) as to whether or not it is possible to perform the transition to the manual driving mode during the transition period is determined, and the transition from the automatic driving mode (S1) to the manual driving mode (S8) is performed in a case where it is determined that it is possible to perform the transition to the manual driving mode (S8).
    Type: Application
    Filed: March 22, 2017
    Publication date: July 4, 2019
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Takahiro ITOU, Kazuya YAMANO, Yasuhito NAKAKUKI
  • Publication number: 20180186406
    Abstract: It is an object of the present invention to provide a power steering apparatus control device in which it is possible to suppress generation of the canceling of the automatic steering unintended by the driver. The present invention provides a control device controlling the operation of a power steering apparatus in which there is selected either an assist control (28) in which a steering force is assisted based on a steering torque input through the operation of a steering wheel or an automatic steering control (29) in which a steering angle of a turning wheel is controlled based on a steering angle command value. When, in the state in which the automatic steering control (29) is selected, the steering torque exceeds a predetermined threshold value, the automatic steering control (29) is canceled and the assist control (28) is selected.
    Type: Application
    Filed: June 9, 2016
    Publication date: July 5, 2018
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Takahiro ITOU, Kenta MAEDA, Kazuya YAMANO, Yasuhito NAKAKUKI
  • Patent number: 9862408
    Abstract: A transverse gradient current Ic which is larger than a basic assist current Ib is outputted, as a current command value, to motor driving section when direction correspondence judgment section 11 judges that rotation directions of first and second rotation angle signals ?1 and ?2 correspond with each other, when an advancing phase judgment section 12 judges that a phase of the second rotation angle signal is advanced, and when a phase variation judgment section 14 judges that a phase advance state of the second rotation angle signal ?2 continues.
    Type: Grant
    Filed: January 14, 2015
    Date of Patent: January 9, 2018
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Yasuhito Nakakuki, Masaki Kodato, Kazuya Yamano, Yoshitaka Sugiyama, Tsukasa Miyajima, Masahiko Ushimura
  • Patent number: 9796414
    Abstract: In order to suppress an electric power steering device from generating a contact noise due to operation of a mechanical stopper and a rack stopper, there is provided a control unit in which a command signal Io applied to an electric motor used for assisting the steering power is calculated taking into consideration both a rack stopper side damping correction represented by a rack side damping correction signal Dr calculated in a rack side damping correction amount calculation part 21 and a mechanical stopper side damping correction represented by a mechanical side damping correction signal Dm calculated in a mechanical side damping correction amount calculation part 23.
    Type: Grant
    Filed: October 5, 2015
    Date of Patent: October 24, 2017
    Assignee: HITACHI AUTOMOTIVE SYSTEMS STEERING, LTD.
    Inventors: Yasuhito Nakakuki, Kazuya Yamano
  • Publication number: 20160368531
    Abstract: A transverse gradient current Ic which is larger than a basic assist current Ib is outputted, as a current command value, to motor driving section when direction correspondence judgment section 11 judges that rotation directions of first and second rotation angle signals ?1 and ?2 correspond with each other, when an advancing phase judgment section 12 judges that a phase of the second rotation angle signal is advanced, and when a phase variation judgment section 14 judges that a phase advance state of the second rotation angle signal ?2 continues.
    Type: Application
    Filed: January 14, 2015
    Publication date: December 22, 2016
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Yasuhito NAKAKUKI, Masaki KODATO, Kazuya YAMANO, Yoshitaka SUGIYAMA, Tsukasa MIYAJIMA, Masahiko USHIMURA
  • Publication number: 20160096545
    Abstract: In order to suppress an electric power steering device from generating a contact noise due to operation of a mechanical stopper and a rack stopper, there is provided a control unit in which a command signal I0 applied to an electric motor used for assisting the steering power is calculated taking into consideration both a rack stopper side damping correction represented by a rack side damping correction signal Dr calculated in a rack side damping correction amount calculation part 21 and a mechanical stopper side damping correction represented by a mechanical side damping correction signal Dm calculated in a mechanical side damping correction amount calculation part 23.
    Type: Application
    Filed: October 5, 2015
    Publication date: April 7, 2016
    Applicant: HITACHI AUTOMOTIVE SYSTEMS STEERING, LTD.
    Inventors: Yasuhito NAKAKUKI, Kazuya YAMANO
  • Patent number: 8376080
    Abstract: A pump apparatus includes: a first housing member which includes a first drive shaft insertion hole; a second housing member which includes a second drive shaft insertion hole; a pump drive shaft; a first abutment portion and a second abutment portion formed in the second housing member; the first and second drive shaft insertion holes being previously co-processed in a state in which the first and second housing member are relatively positioned by abutments between the first and second positioning protruding portions and the first and second abutment portions, and a joining member joining the first and second housing members in a state in which the first and second housing members are relatively positioned by the abutments of the first and second positioning protruding portions and the first and second abutment portions so as to re-create a relative position between the first and second housing members at the co-processing.
    Type: Grant
    Filed: April 13, 2011
    Date of Patent: February 19, 2013
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Yasuhito Nakakuki, Takumi Hisazumi, Kunimi Yoshino, Takeshi Ito, Yuji Shibuya
  • Publication number: 20120067664
    Abstract: A pump apparatus includes: a first housing member which includes a first drive shaft insertion hole; a second housing member which includes a second drive shaft insertion hole; a pump drive shaft; a first abutment portion and a second abutment portion formed in the second housing member; the first and second drive shaft insertion holes being previously co-processed in a state in which the first and second housing member are relatively positioned by abutments between the first and second positioning protruding portions and the first and second abutment portions, and a joining member joining the first and second housing members in a state in which the first and second housing members are relatively positioned by the abutments of the first and second positioning protruding portions and the first and second abutment portions so as to re-create a relative position between the first and second housing members at the co-processing.
    Type: Application
    Filed: April 13, 2011
    Publication date: March 22, 2012
    Inventors: Yasuhito NAKAKUKI, Takumi Hisazumi, Kunimi Yoshino, Takeshi Ito, Yuji Shibuya
  • Patent number: 8020660
    Abstract: In a pump device applicable to a power steering apparatus, a pump element is housed within a pump housing and is configured to drain a working oil, an electric motor is configured to drive the pump element, a reservoir tank is installed on the housing and is configured to reserve the working oil supplied to the oil element, a passage is formed within the pump housing and is connected to the pump element, and a control valve is installed in the pump housing, is configured to communicate with the passage, and is configured to control a flow of the working oil caused to flow through the passage.
    Type: Grant
    Filed: June 16, 2006
    Date of Patent: September 20, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Masakazu Kurata, Takumi Hisazumi, Yasuhito Nakakuki, Mitsuaki Nakada
  • Patent number: 7959422
    Abstract: An oil pump including a first housing having a rotation shaft insertion hole, a cam ring, a pump element, a rotation shaft rotatably extending through the rotation shaft insertion hole, a second housing disposed on the cam ring, wherein the cam ring is placed in a position relative to the rotation shaft insertion hole of the first housing by using a jig, and the cam ring includes a clamped portion that is clamped by a cam ring holding device, while the first housing and the second housing are fixed to each other after placing the cam ring in the position relative to the rotation shaft insertion hole by using the jig. Alternatively, the oil pump including a fixing means for fixing the cam ring to the pump body instead of the clamped portion.
    Type: Grant
    Filed: December 12, 2007
    Date of Patent: June 14, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Yasuhito Nakakuki, Kaname Kidokoro, Tetsuo Abe, Toshimitsu Sakaki, Mitsuo Sasaki, Masakazu Kurata
  • Patent number: 7722342
    Abstract: In order to realize cost reduction in a gear pump apparatus by reducing form accuracy of a gear while securing pump performance, a running-in coating is provided on a tooth sliding contact portion when forming a confinement area in at least one of gears of the gear pump apparatus. By this feature, the running-in coating is gradually worn away and deformed according to rotary drive of the pump, and thus it is possible to obtain an optimal gear form in meshing combinations of the gears. Further, it is possible to reduce leakage inside the pump to secure the pump performance even if the form accuracy of the gear is reduced for the sake of the cost reduction.
    Type: Grant
    Filed: March 9, 2007
    Date of Patent: May 25, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Isamu Tsubono, Mitsuo Sasaki, Toru Takahashi, Masaaki Busujima, Masakazu Kurata, Yasuhito Nakakuki
  • Publication number: 20080145259
    Abstract: An oil pump including a first housing having a rotation shaft insertion hole, a cam ring, a pump element, a rotation shaft rotatably extending through the rotation shaft insertion hole, a second housing disposed on the cam ring, wherein the cam ring is placed in a position relative to the rotation shaft insertion hole of the first housing by using a jig, and the cam ring includes a clamped portion that is clamped by a cam ring holding device, while the first housing and the second housing are fixed to each other after placing the cam ring in the position relative to the rotation shaft insertion hole by using the jig. Alternatively, the oil pump including a fixing means for fixing the cam ring to the pump body instead of the clamped portion.
    Type: Application
    Filed: December 12, 2007
    Publication date: June 19, 2008
    Applicant: Hitachi, Ltd.
    Inventors: Yasuhito NAKAKUKI, Kaname Kidokoro, Tetsuo Abe, Toshimitsu Sakaki, Mitsuo Sasaki, Masakazu Kurata
  • Patent number: 7374411
    Abstract: An oil pump is provided which includes a cam ring made of a material having a first line expansion coefficient, a pump element rotatably disposed in the cam ring and smaller in an axial length than the cam ring, a first housing member disposed on one of axially opposite sides of the cam ring and made of a material having a second line expansion coefficient larger than the first line expansion coefficient, and a second housing member disposed on the other of the axially opposite sides of the cam ring and made of a material having a third line expansion coefficient than the first line expansion coefficient.
    Type: Grant
    Filed: July 21, 2005
    Date of Patent: May 20, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Yasuhito Nakakuki, Toshimitsu Sakaki
  • Publication number: 20070253855
    Abstract: In order to realize cost reduction in a gear pump apparatus by reducing form accuracy of a gear while securing pump performance, a running-in coating is provided on a tooth sliding contact portion when forming a confinement area in at least one of gears of the gear pump apparatus. By this feature, the running-in coating is gradually worn away and deformed according to rotary drive of the pump, and thus it is possible to obtain an optimal gear form in meshing combinations of the gears. Further, it is possible to reduce leakage inside the pump to secure the pump performance even if the form accuracy of the gear is reduced for the sake of the cost reduction.
    Type: Application
    Filed: March 9, 2007
    Publication date: November 1, 2007
    Applicant: Hitachi, Ltd.
    Inventors: Isamu TSUBONO, Mitsuo Sasaki, Toru Takahashi, Masaaki Busujima, Masakazu Kurata, Yasuhito Nakakuki