Patents by Inventor Hirofumi Kinjou

Hirofumi Kinjou 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: 10378922
    Abstract: A rotation angle detection apparatus includes a magnet that is provided to a rotating shaft of a rotating body and rotates with the rotating shaft to generate magnetic flux and a magnetic sensor that is provided at a distance from the magnet and detects a magnetic flux interlinked with the magnetic sensor. The rotation angle detection apparatus has a magnet magnetic flux detection circuit that detects a magnet magnetic flux generated from the magnet, a disturbance magnetic flux detection circuit that detects a disturbance magnetic flux, which is a magnetic flux other than the magnet magnetic flux and is interlinked with the magnetic sensor, and a correction circuit that corrects a result of detection of the magnetic sensor based on a result of detection of the magnet magnetic flux detection circuit and a result of detection of the disturbance magnetic flux detection circuit.
    Type: Grant
    Filed: January 13, 2016
    Date of Patent: August 13, 2019
    Assignee: DENSO CORPORATION
    Inventors: Takuya Kawamura, Hirofumi Kinjou, Toru Wakimoto, Hideaki Nakayama, Masataka Yoshimura
  • Patent number: 10006784
    Abstract: A correction circuit stores data for obtaining coefficients of a relational expression indicating a relationship between a disturbance magnetic flux and a rotational angle error. Then, the coefficients are obtained from the data for obtaining the coefficients, and a detection result of a magnetic sensor is corrected based on the coefficients obtained, a relational expression, and a detection result of a disturbance magnetic flux detection circuit. Since it is possible to obtain the rotational angle error with respect to the disturbance magnetic flux from the coefficient obtained and the relational expression, it is not necessary to store the data indicating the relationship between the disturbance magnetic flux and the rotational angle error for all of the disturbance magnetic flux value in disturbance magnetic flux regions that may be applied.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: June 26, 2018
    Assignee: DENSO CORPORATION
    Inventors: Takuya Kawamura, Hirofumi Kinjou, Toru Wakimoto, Hideaki Nakayama, Masataka Yoshimura
  • Publication number: 20170363444
    Abstract: A rotation angle detection apparatus includes a magnet that is provided to a rotating shaft of a rotating body and rotates with the rotating shaft to generate magnetic flux and a magnetic sensor that is provided at a distance from the magnet and detects a magnetic flux interlinked with the magnetic sensor. The rotation angle detection apparatus has a magnet magnetic flux detection circuit that detects a magnet magnetic flux generated from the magnet, a disturbance magnetic flux detection circuit that detects a disturbance magnetic flux, which is a magnetic flux other than the magnet magnetic flux and is interlinked with the magnetic sensor, and a correction circuit that corrects a result of detection of the magnetic sensor based on a result of detection of the magnet magnetic flux detection circuit and a result of detection of the disturbance magnetic flux detection circuit.
    Type: Application
    Filed: January 13, 2016
    Publication date: December 21, 2017
    Applicant: DENSO CORPORATION
    Inventors: Takuya KAWAMURA, Hirofumi KINJOU, Toru WAKIMOTO, Hideaki NAKAYAMA, Masataka YOSHIMURA
  • Publication number: 20160265942
    Abstract: A correction circuit stores data for obtaining coefficients of a relational expression indicating a relationship between a disturbance magnetic flux and a rotational angle error. Then, the coefficients are obtained from the data for obtaining the coefficients, and a detection result of a magnetic sensor is corrected based on the coefficients obtained, a relational expression, and a detection result of a disturbance magnetic flux detection circuit. Since it is possible to obtain the rotational angle error with respect to the disturbance magnetic flux from the coefficient obtained and the relational expression, it is not necessary to store the data indicating the relationship between the disturbance magnetic flux and the rotational angle error for all of the disturbance magnetic flux value in disturbance magnetic flux regions that may be applied.
    Type: Application
    Filed: March 4, 2016
    Publication date: September 15, 2016
    Applicant: DENSO CORPORATION
    Inventors: Takuya KAWAMURA, Hirofumi KINJOU, Toru WAKIMOTO, Hideaki NAKAYAMA, Masataka YOSHIMURA
  • Patent number: 9184736
    Abstract: A current mode controlled power converter controllable in a digitally processing current mode even during an on time. In the power converter, each control period based on a reference signal includes a slope calculation period in which a slope compensation signal for the control period is calculated by a slope compensation unit. During each slope calculation period, the slope compensation unit negates the slope compensation signal calculated previous to the control period including the slope calculation period, and a reset signal generation unit compares a current detection signal detected by a current detection unit with a current instruction set to an error signal generated by an error signal generation unit to generate a reset signal.
    Type: Grant
    Filed: August 30, 2013
    Date of Patent: November 10, 2015
    Assignee: DENSO CORPORATION
    Inventors: Hirofumi Kinjou, Yuji Hayashi, Keiji Shigeoka, Kimikazu Nakamura
  • Patent number: 9071149
    Abstract: A DC-DC converter generates PWM signals PWM1H, PWM1L on the basis of a reference signal CLK1 to drive switching elements connected in series. When generating a reset signal RST, the converter generates PWM signals PWM2H, PWM2L on the basis of the reset signal RST. When generating no reset signal, the converter generates the PWM signals PWM2H, PWM2L on the basis of a reference signal CLK2 in order to drive other switching elements connected in series. The converter generates the reset signal RST at an optional timing to the reference signal CLK1. The reference signal CLK2 is brought forward from the reference signal CLK1 by ?T1. The PWM signals PWM1H, PWM1L are different in timing from the PWM signals PWM2H, PWM2L. This makes it possible to avoid the switching elements diagonally arranged from being simultaneously turned on and off, and suppress a switching loss, and to increase an efficiency of the converter.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: June 30, 2015
    Assignee: DENSO CORPORATION
    Inventors: Hirofumi Kinjou, Keiji Shigeoka, Yuji Hayashi, Kenji Tomita, Kimikazu Nakamura
  • Publication number: 20140062558
    Abstract: A current mode controlled power converter controllable in a digitally processing current mode even during an on time. In the power converter, each control period based on a reference signal includes a slope calculation period in which a slope compensation signal for the control period is calculated by a slope compensation unit. During each slope calculation period, the slope compensation unit negates the slope compensation signal calculated previous to the control period including the slope calculation period, and a reset signal generation unit compares a current detection signal detected by a current detection unit with a current instruction set to an error signal generated by an error signal generation unit to generate a reset signal.
    Type: Application
    Filed: August 30, 2013
    Publication date: March 6, 2014
    Applicant: DENSO CORPORATION
    Inventors: Hirofumi KINJOU, Yuji HAYASHI, Keiji SHIGEOKA, Kimikazu NAKAMURA
  • Publication number: 20130336014
    Abstract: A DC-DC converter generates PWM signals PWM1H, PWM1L on the basis of a reference signal CLK1 to drive switching elements connected in series. When generating a reset signal RST, the converter generates PWM signals PWM2H, PWM2L on the basis of the reset signal RST. When generating no reset signal, the converter generates the PWM signals PWM2H, PWM2L on the basis of a reference signal CLK2 in order to drive other switching elements connected in series. The converter generates the reset signal RST at an optional timing to the reference signal CLK1. The reference signal CLK2 is brought forward from the reference signal CLK1 by ?T1. The PWM signals PWM1H, PWM1L are different in timing from the PWM signals PWM2H, PWM2L. This makes it possible to avoid the switching elements diagonally arranged from being simultaneously turned on and off, and suppress a switching loss, and to increase an efficiency of the converter.
    Type: Application
    Filed: March 18, 2013
    Publication date: December 19, 2013
    Applicant: DENSO CORPORATION
    Inventors: Hirofumi KINJOU, Keiji SHIGEOKA, Yuji HAYASHI, Kenji TOMITA, Kimikazu NAKAMURA
  • Patent number: 8018111
    Abstract: A rotor core has permanent magnets. Magnetic flux of the permanent magnet of an even-numbered rotor magnetic pole part is guided in an axial direction by an axial magnetic path member. Magnetic flux of the permanent magnet of an odd-numbered rotor magnetic pole part is guided into a soft magnetic inner cylindrical part. The axial end faces of the inner cylindrical part and the axial magnetic path member protrude from the rotor core in the axial direction and face a stationary magnetic path member with a small gap therebetween. The amount of magnetic flux of the magnet, which the permanent magnet applies to a stator core is adjusted by an excitation current of an excitation coil wound on the stationary magnetic path member.
    Type: Grant
    Filed: June 2, 2009
    Date of Patent: September 13, 2011
    Assignees: Denso Corporation, Nippon Soken, Inc.
    Inventors: Hirofumi Kinjou, Sadahisa Onimaru
  • Patent number: 7821177
    Abstract: A laminated core includes a laminated body, clamping plates and holding members. The laminated body includes a plurality of amorphous alloy plates, which are stacked one after another in a stacking direction such that each adjacent two of the plurality of amorphous alloy plates directly contact with each other. The clamping plates contact opposed end surfaces, respectively, of the laminated body in the stacking direction. A thickness of each of the first and second clamping plates in the stacking direction is larger than that of each of the plurality of amorphous alloy plates. Each holding member contacts with the clamping plates and maintains a predetermined space between the clamping plates while the laminated body is clamped between the clamping plates.
    Type: Grant
    Filed: February 22, 2008
    Date of Patent: October 26, 2010
    Assignee: Nippon Soken, Inc.
    Inventors: Sadahisa Onimaru, Hirofumi Kinjou, Daisuke Miyata, Katsuhiko Oka
  • Patent number: 7759834
    Abstract: An electromagnetic device includes a plurality of coils formed by winding conductors. At least some of the conductors are constructed by stacking conductor constructional elements so that an eddy current generated by a leakage flux linked to the conductor is divided. An outer insulating member is disposed on an outer circumferential surface of the conductor stack for electrically insulating the conductor stack from another member. An inner insulating member whose thickness is smaller than a thickness of the outer insulating member is disposed between the conductor constructional elements adjoining to each other in the same conductor stack.
    Type: Grant
    Filed: July 5, 2007
    Date of Patent: July 20, 2010
    Assignees: Nippon Soken, Inc., Denso Corporation
    Inventors: Sadahisa Onimaru, Hirofumi Kinjou, Katsuhiko Oka, Daisuke Miyata
  • Publication number: 20100026115
    Abstract: Stator windings for an electric rotary machine comprise a lead wire wound in predetermined form that has a lead part formed by laminating plate-like conductors, a beginning and an end of a winding of the lead part are connected to the conductors, and at least one place between a beginning and an end of a winding of the lead part is twisted.
    Type: Application
    Filed: July 31, 2009
    Publication date: February 4, 2010
    Applicant: NIPPON SOKEN, INC.
    Inventors: Hirofumi KINJOU, Sadahisa Onimaru
  • Publication number: 20090295249
    Abstract: A rotor core has permanent magnets. Magnetic flux of the permanent magnet of an even-numbered rotor magnetic pole part is guided in an axial direction by an axial magnetic path member. Magnetic flux of the permanent magnet of an odd-numbered rotor magnetic pole part is guided into a soft magnetic inner cylindrical part. The axial end faces of the inner cylindrical part and the axial magnetic path member protrude from the rotor core in the axial direction and face a stationary magnetic path member with a small gap therebetween. The amount of magnetic flux of the magnet, which the permanent magnet applies to a stator core is adjusted by an excitation current of an excitation coil wound on the stationary magnetic path member.
    Type: Application
    Filed: June 2, 2009
    Publication date: December 3, 2009
    Applicants: DENSO CORPORATION, NIPPON SOKEN, INC.
    Inventors: Hirofumi KINJOU, Sadahisa Onimaru
  • Publication number: 20080231138
    Abstract: A laminated core includes a laminated body, clamping plates and holding members. The laminated body includes a plurality of amorphous alloy plates, which are stacked one after another in a stacking direction such that each adjacent two of the plurality of amorphous alloy plates directly contact with each other. The clamping plates contact opposed end surfaces, respectively, of the laminated body in the stacking direction. A thickness of each of the first and second clamping plates in the stacking direction is larger than that of each of the plurality of amorphous alloy plates. Each holding member contacts with the clamping plates and maintains a predetermined space between the clamping plates while the laminated body is clamped between the clamping plates.
    Type: Application
    Filed: February 22, 2008
    Publication date: September 25, 2008
    Applicant: NIPPON SOKEN, INC.
    Inventors: Sadahisa Onimaru, Hirofumi Kinjou, Daisuke Miyata, Katsuhiko Oka
  • Publication number: 20080007133
    Abstract: An electromagnetic device includes a plurality of coils formed by winding conductors. At least some of the conductors are constructed by stacking conductor constructional elements so that an eddy current generated by a leakage flux linked to the conductor is divided. An outer insulating member is disposed on an outer circumferential surface of the conductor stack for electrically insulating the conductor stack from another member. An inner insulating member whose thickness is smaller than a thickness of the outer insulating member is disposed between the conductor constructional elements adjoining to each other in the same conductor stack.
    Type: Application
    Filed: July 5, 2007
    Publication date: January 10, 2008
    Applicant: NIPPON SOKEN, INC.
    Inventors: Sadahisa Onimaru, Hirofumi Kinjou, Katsuhiko Oka, Daisuke Miyata