Patents by Inventor Masayuki Kita

Masayuki Kita 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).

  • Patent number: 10981596
    Abstract: A control steered angle calculation unit includes: an end position determination unit that determines whether a rack shaft is located at either one of right and left rack end positions; a motor absolute angle calculation unit that detects a motor absolute angle; an end position-corresponding motor angle setting unit that, when the rack shaft is determined to be located at either one of the right and left rack end positions, sets the detected motor absolute angle as an end position-corresponding motor angle corresponding to the one of the right and left rack end positions; and a control steered angle origin setting unit that calculates an average value of right and left end position-corresponding motor angles as an offset angle, and sets an angle obtained by subtracting the offset angle from the detected motor absolute angle as an origin of the control steered angle represented by the motor ab solute angle.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: April 20, 2021
    Assignee: JTEKT CORPORATION
    Inventors: Nobuaki Kataoka, Shingo Maeda, Jun Hasegawa, Masayuki Kita, Takahiro Toko
  • Patent number: 10933909
    Abstract: A control apparatus calculates an axial force deviation, which is a difference between an estimated axial force and an ideal axial force based on a target pinion angle of a pinion shaft in association with a turning operation of steered wheels. The estimated axial force is based on a state variable that reflects vehicle behavior or a road condition. The control apparatus includes a steering angle ratio change control circuit configured to calculate a target pinion angle serving as a basis for calculation of the command value. The steering angle ratio change control circuit calculates a speed increasing ratio from a steering angle ratio set based on a vehicle speed and a base gear ratio of a steering mechanism, and calculates a correction angle for a target steering angle by multiplying the speed increasing ratio and the target steering angle together.
    Type: Grant
    Filed: September 20, 2018
    Date of Patent: March 2, 2021
    Assignee: JTEKT CORPORATION
    Inventors: Takashi Kodera, Masayuki Kita
  • Patent number: 10792653
    Abstract: An emissions control substrate for treating exhaust from an engine including a plurality of hexagonal cells extending between a first end and a second end of the substrate. Wash coats are at an interior of the hexagonal cells. At an inner region of the substrate through which a longitudinal axis of the emissions control substrate extends, for every group of three adjacent hexagonal cells of the plurality of hexagonal cells two are plugged at the first end and open at the second end, and one is open at the first end and plugged at the second end. At an outer region of the substrate surrounding the inner region, for every group of three adjacent hexagonal cells of the plurality of hexagonal cells, one is plugged at the first end and open at the second end, and two are open at the first end and plugged at the second end.
    Type: Grant
    Filed: February 6, 2018
    Date of Patent: October 6, 2020
    Assignee: DENSO International America, Inc.
    Inventors: Masayuki Kita, Nicholas Polcyn, Han-Yuan Chang
  • Publication number: 20200062294
    Abstract: A controller includes a control circuit configured to calculate a target corresponding steered angle that is a target value of a corresponding steered angle based on the transmission ratio associated with the vehicle speed. The corresponding steered angle is a rotation angle of a rotation shaft, which is convertible to the steered angle whose magnitude is changed relative to a value indicating the steering angle. The control circuit is configured to control the actuation of the motor so that an actual corresponding steered angle is a final target corresponding steered angle that is based on the target corresponding steered angle. The control circuit is configured to calculate the target corresponding steered angle by adjusting the transmission ratio based on a value indicating acceleration or deceleration of a vehicle.
    Type: Application
    Filed: August 21, 2019
    Publication date: February 27, 2020
    Applicants: JTEKT CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takashi KODERA, Masayuki KITA, Toru TAKASHIMA, Tetsuya MORINO
  • Publication number: 20190367083
    Abstract: A steering control apparatus includes an electronic control unit. The electronic control unit computes a first component of a command value. The electronic control unit computes a target rotation angle of a rotatable element based on an input torque. The rotatable element rotates with an operation of the steering wheel. The electronic control unit computes a second component of the command value through feedback control. The electronic control unit computes an ideal axial force based on the target rotation angle. The electronic control unit shifts the ideal axial force as a function of a cross slope, which is a slope in a direction that intersects at right angles with a road, in a specified direction with reference to a neutral value of the ideal axial force, associated with a state where the vehicle travels straight ahead.
    Type: Application
    Filed: May 23, 2019
    Publication date: December 5, 2019
    Applicant: JTEKT CORPORATION
    Inventors: Takashi KODERA, Terutaka TAMAIZUMI, Masayuki KITA, Isao NAMIKAWA
  • Patent number: 10392019
    Abstract: An ECU includes a deviation calculating circuit an assist control circuit, an automatic steering control circuit including an intervention determination switching circuit, an adder, a current command value calculating circuit The intervention determination switching circuit includes a count amount calculating circuit, an adder, an immediately-preceding count amount output circuit, a switching determination circuit, and an output switching circuit. The count amount calculating circuit calculates a count amount having a positive value or a negative value based on a steering torque absolute value calculated by an absolute value switching circuit. The adder calculates a total count amount that is the total sum of a presently calculated count amount and an immediately-preceding count amount calculated in an immediately-preceding calculation cycle.
    Type: Grant
    Filed: August 3, 2017
    Date of Patent: August 27, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Shingo Maeda, Terutaka Tamaizumi, Jun Hasegawa, Masayuki Kita, Gempei Nakasone, Hiromasa Tamaki
  • Publication number: 20190240651
    Abstract: An emissions control substrate for treating exhaust from an engine including a plurality of hexagonal cells extending between a first end and a second end of the substrate. Wash coats are at an interior of the hexagonal cells. At an inner region of the substrate through which a longitudinal axis of the emissions control substrate extends, for every group of three adjacent hexagonal cells of the plurality of hexagonal cells two are plugged at the first end and open at the second end, and one is open at the first end and plugged at the second end. At an outer region of the substrate surrounding the inner region, for every group of three adjacent hexagonal cells of the plurality of hexagonal cells, one is plugged at the first end and open at the second end, and two are open at the first end and plugged at the second end.
    Type: Application
    Filed: February 6, 2018
    Publication date: August 8, 2019
    Inventors: Masayuki KITA, Nicholas POLCYN, Han-Yuan CHANG
  • Publication number: 20190092384
    Abstract: A control apparatus calculates an axial force deviation, which is a difference between an estimated axial force and an ideal axial force based on a target pinion angle of a pinion shaft in association with a turning operation of steered wheels. The estimated axial force is based on a state variable that reflects vehicle behavior or a road condition. The control apparatus includes a steering angle ratio change control circuit configured to calculate a target pinion angle serving as a basis for calculation of the command value. The steering angle ratio change control circuit calculates a speed increasing ratio from a steering angle ratio set based on a vehicle speed and a base gear ratio of a steering mechanism, and calculates a correction angle for a target steering angle by multiplying the speed increasing ratio and the target steering angle together.
    Type: Application
    Filed: September 20, 2018
    Publication date: March 28, 2019
    Applicant: JTEKT CORPORATION
    Inventors: Takashi KODERA, Masayuki KITA
  • Publication number: 20180368300
    Abstract: A new and distinct variety of Citrus L. plant named ‘ASUKI’, characterized by being late-maturing, having high brix and excellent taste, being easy to eat because of its soft segment membrane, having no occurrence of fruit rind puffing, and having less dripping of fruit juice.
    Type: Application
    Filed: June 19, 2018
    Publication date: December 20, 2018
    Applicant: National Agriculture and Food Research Organization
    Inventors: Terutaka Yoshioka, Toshio Yoshida, Hirohisa Nesumi, Satoshi Ota, Masayuki Kita, Takeshi Kuniga, Mutsuko Nonomura, Naoko Nakajima, Hiroko Hamada, Keisuke Nonaka, Fumitaka Takishita
  • Publication number: 20180346018
    Abstract: A control steered angle calculation unit includes: an end position determination unit that determines whether a rack shaft is located at either one of right and left rack end positions; a motor absolute angle calculation unit that detects a motor absolute angle; an end position-corresponding motor angle setting unit that, when the rack shaft is determined to be located at either one of the right and left rack end positions, sets the detected motor absolute angle as an end position-corresponding motor angle corresponding to the one of the right and left rack end positions; and a control steered angle origin setting unit that calculates an average value of right and left end position-corresponding motor angles as an offset angle, and sets an angle obtained by subtracting the offset angle from the detected motor absolute angle as an origin of the control steered angle represented by the motor ab solute angle.
    Type: Application
    Filed: May 25, 2018
    Publication date: December 6, 2018
    Applicant: JTEKT CORPORATION
    Inventors: Nobuaki KATAOKA, Shingo MAEDA, Jun HASEGAWA, Masayuki KITA, Takahiro TOKO
  • Publication number: 20180339725
    Abstract: An estimated axial force computation circuit of a control device has an axial force computation circuit that computes an axial force that acts on a steered shaft on the basis of a current value of a steering motor. The estimated axial force computation circuit has a friction compensation circuit, an efficiency compensation circuit, and a gradient compensation circuit as static characteristic computation circuits that compensate for an effect of the static characteristics of a steering mechanism on the axial force computed. The estimated axial force computation circuit has a filter as a dynamic characteristic computation circuit that compensates for an effect of the dynamic characteristics of the steering mechanism. The filter removes, from the axial force, an effect of the viscosity and the inertia of the steering motor. The axial force after compensation is used to control a reaction force motor.
    Type: Application
    Filed: May 10, 2018
    Publication date: November 29, 2018
    Applicant: JTEKT CORPORATION
    Inventors: Takashi KODERA, Masayuki KITA
  • Patent number: 9914473
    Abstract: Provided is an electric power steering system that achieves a more appropriate steering feel. An ECU of the electric power steering system calculates a basic assist component and a target pinion angle based on at least steering torque. The ECU calculates a correction component for the basic assist component through feedback control in which an actual pinion angle is caused to match the target pinion angle. The ECU calculates an assist command value by adding the correction component to the basic assist component. The ECU corrects a hysteresis controlled variable and a viscosity component according to the rate of change (gradient) in a spring component with respect to a change in absolute value of the target pinion angle. Specifically, the ECU multiplies the hysteresis controlled variable and the viscosity component by gains that have a larger value as the rate of change in spring component increases.
    Type: Grant
    Filed: January 28, 2016
    Date of Patent: March 13, 2018
    Assignee: JTEKT CORPORATION
    Inventors: Terutaka Tamaizumi, Hirozumi Eki, Masayuki Kita
  • Publication number: 20180057009
    Abstract: An ECU includes a deviation calculating circuit an assist control circuit, an automatic steering control circuit including an intervention determination switching circuit, an adder, a current command value calculating circuit The intervention determination switching circuit includes a count amount calculating circuit, an adder, an immediately-preceding count amount output circuit, a switching determination circuit, and an output switching circuit. The count amount calculating circuit calculates a count amount having a positive value or a negative value based on a steering torque absolute value calculated by an absolute value switching circuit. The adder calculates a total count amount that is the total sum of a presently calculated count amount and an immediately-preceding count amount calculated in an immediately-preceding calculation cycle.
    Type: Application
    Filed: August 3, 2017
    Publication date: March 1, 2018
    Applicant: JTEKT CORPORATION
    Inventors: Shingo MAEDA, Terutaka TAMAIZUMI, Jun HASEGAWA, Masayuki KITA, Gempei NAKASONE, Hiromasa TAMAKI
  • Patent number: 9718492
    Abstract: An end determination unit determines that a steering apparatus is in an end touching state when an angle deviation, which is a difference between an actual turning angle and a target turning angle, exceeds a threshold. This angle deviation exceeds the threshold before a large axial force is generated in a steering shaft. Accordingly, is it possible to determine that the steering apparatus is in the end touching state more quickly.
    Type: Grant
    Filed: February 10, 2014
    Date of Patent: August 1, 2017
    Assignee: JTEKT CORPORATION
    Inventors: Terutaka Tamaizumi, Hirozumi Eki, Masayuki Kita, Isao Namikawa
  • Patent number: 9573616
    Abstract: A control device in an electric power steering device calculates a first assist component based on steering torque and a vehicle speed. The control device also calculates a compensation component associated with an reverse input and calculates a steered angle command value based on an addition value of the compensation component and basic drive torque that is an addition value of the steering torque and the first assist component, produces a second assist component by performing steered angle feedback control that causes the steered angle of a vehicle to follow the steered angle command value. The control device controls drive of a motor based on an assist command value that is an addition value of the first assist component and the second assist component.
    Type: Grant
    Filed: February 27, 2015
    Date of Patent: February 21, 2017
    Assignee: JTEKT CORPORATION
    Inventors: Terutaka Tamaizumi, Hirozumi Eki, Masayuki Kita, Isao Namikawa, Akihiko Nishimura, Jun Hasegawa
  • Publication number: 20160229446
    Abstract: Provided is an electric power steering system that achieves a more appropriate steering feel. An ECU of the electric power steering system calculates a basic assist component and a target pinion angle based on at least steering torque. The ECU calculates a correction component for the basic assist component through feedback control in which an actual pinion angle is caused to match the target pinion angle. The ECU calculates an assist command value by adding the correction component to the basic assist component. The ECU corrects a hysteresis controlled variable and a viscosity component according to the rate of change (gradient) in a spring component with respect to a change in absolute value of the target pinion angle. Specifically, the ECU multiplies the hysteresis controlled variable and the viscosity component by gains that have a larger value as the rate of change in spring component increases.
    Type: Application
    Filed: January 28, 2016
    Publication date: August 11, 2016
    Applicant: JTEKT CORPORATION
    Inventors: Terutaka TAMAIZUMI, Hirozumi EKI, Masayuki KITA
  • Patent number: 9327760
    Abstract: There is provided an electric power steering system that makes it possible to improve the driver's steering feel, and that includes a controller that controls driving of a motor. The controller computes a first assist component based on a steering torque. The controller computes a torque command value based on a basic drive torque that is the sum of the steering torque and the first assist component, and computes an assist compensation component through feedback control based on the torque command value. The controller computes a steered angle command value based on a value obtained by adding the assist compensation component to the basic drive torque, and computes a second assist component through feedback control based on the steered angle command value. The controller controls driving of the motor based on an assist command value that is the sum of the first assist component and the second assist component.
    Type: Grant
    Filed: May 7, 2014
    Date of Patent: May 3, 2016
    Assignee: JTEKT CORPORATION
    Inventors: Terutaka Tamaizumi, Hirozumi Eki, Masayuki Kita, Isao Namikawa, Jun Hasegawa, Akihiko Nishimura
  • Patent number: 9290200
    Abstract: In the vehicle power steering system, a first assist torque component is computed based on a steering torque and a vehicle speed. A target steered angle is computed based on the first assist torque component and the steering torque, and a second assist torque component is set based on the target steered angle and an actual steered angle. Then, the vehicle power steering system assists a steering operation by applying an assist torque Tas corresponding to the first assist torque component and the second assist torque component. Further, an ideal steered angle at which a vehicle is able to keep travelling in a lane is set based on image information on the lane captured by a camera, and a correction value is computed based on the deviation between the ideal steered angle and the actual steered angle. Then, the target steered angle is corrected by the correction value.
    Type: Grant
    Filed: August 8, 2014
    Date of Patent: March 22, 2016
    Assignee: JTEKT CORPORATION
    Inventors: Terutaka Tamaizumi, Hirozumi Eki, Masayuki Kita, Isao Namikawa
  • Patent number: 9272730
    Abstract: In an electric power steering system, a vehicle reactive force model computes a correction spring reactive torque in such a manner that an elasticity component included in a steering reactive force is increased with an increase in a lateral acceleration. As the lateral acceleration increases, an increase in a basic drive torque is suppressed by a larger amount. By an amount by which the magnitude of the basic drive torque is suppressed, a target pinion angle computed by a target pinion angle computing unit decreases and a correction component for a basic assist component is decreased. A steering assist force is decreased, and a steering reactive force is increased with a decrease in the steering assist force. Thus, it is possible to obtain an appropriate steering reactive force based on the magnitude of the lateral acceleration.
    Type: Grant
    Filed: August 19, 2014
    Date of Patent: March 1, 2016
    Assignee: JTEKT CORPORATION
    Inventors: Terutaka Tamaizumi, Masayuki Kita, Isao Namikawa, Hirozumi Eki
  • Patent number: PP31146
    Abstract: A new and distinct variety of Citrus L. plant named ‘ASUKI’, characterized by being late-maturing, having high brix and excellent taste, being easy to eat because of its soft segment membrane, having no occurrence of fruit rind puffing, and having less dripping of fruit juice.
    Type: Grant
    Filed: June 19, 2018
    Date of Patent: December 3, 2019
    Assignee: National Agriculture and Food Research Organization
    Inventors: Terutaka Yoshioka, Toshio Yoshida, Hirohisa Nesumi, Satoshi Ota, Masayuki Kita, Takeshi Kuniga, Mutsuko Nonomura, Naoko Nakajima, Hiroko Hamada, Keisuke Nonaka, Fumitaka Takishita