Patents by Inventor Hiroshi Fujiwara

Hiroshi Fujiwara 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: 20170232847
    Abstract: An electric vehicle controller includes an inverter that drives a motor by receiving power supplied from an overhead line, a brake chopper circuit that includes a switching device and a braking resistor and is connected in parallel with the inverter, a voltage detector that detects a bus voltage applied to DC buses, and a control unit that performs power consumption control of causing the braking resistor to consume regenerative power supplied from the motor and overvoltage suppression control of suppressing the bus voltage from being excessive. The control unit controls the switching device such that a second duty ratio used at the time of performing the overvoltage suppression control is lower than a first duty ratio used at the time of performing the power consumption control.
    Type: Application
    Filed: August 25, 2014
    Publication date: August 17, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Hiroshi FUJIWARA, Yuri YAMAMOTO, Yu HIRAYAMA
  • Patent number: 9525378
    Abstract: A motor control device of the present invention includes a position detector (107), a feedforward controller, a predistorter, a feedback controller, a vibration suppression controller, a torque controller, a torque estimator, and an adjustment calculator. The vibration suppression controller receives a manipulation-quantity command value derived by addition of a feedforward manipulation quantity and a feedback manipulation quantity, and outputs an actual manipulation-quantity command value corresponding to the received manipulation-quantity command value. The torque controller controls a manipulation quantity generated by the motor so that the manipulation quantity matches the actual manipulation-quantity command value. The adjustment calculator adjusts a transfer characteristic of the predistorter such that the transfer characteristic becomes equal to a transfer characteristic from the manipulation-quantity command value to the manipulation quantity.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: December 20, 2016
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventor: Hiroshi Fujiwara
  • Publication number: 20160344326
    Abstract: A motor control device of the present invention includes a position detector (107), a feedforward controller, a predistorter, a feedback controller, a vibration suppression controller, a torque controller, a torque estimator, and an adjustment calculator. The vibration suppression controller receives a manipulation-quantity command value derived by addition of a feedforward manipulation quantity and a feedback manipulation quantity, and outputs an actual manipulation-quantity command value corresponding to the received manipulation-quantity command value. The torque controller controls a manipulation quantity generated by the motor so that the manipulation quantity matches the actual manipulation-quantity command value. The adjustment calculator adjusts a transfer characteristic of the predistorter such that the transfer characteristic becomes equal to a transfer characteristic from the manipulation-quantity command value to the manipulation quantity.
    Type: Application
    Filed: July 3, 2014
    Publication date: November 24, 2016
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventor: HIROSHI FUJIWARA
  • Publication number: 20160313721
    Abstract: A method, according to the present invention, of adjusting control parameters used in a control apparatus of an electric motor includes the steps of: computing a first frequency characteristic (Step 1); computing a present speed-proportional gain range (Step 2); computing a present mechanical-system characteristic constant (Step 3); computing a present proportional gain range (Step 4); computing a secular characteristic (Step 5); computing a secular speed-proportional gain range (Step 6); computing a secular proportional gain range (Step 7); and selecting proportional gain values (Step 8).
    Type: Application
    Filed: February 18, 2015
    Publication date: October 27, 2016
    Applicant: Panasonic Intellecyual Property Management Co., Lt
    Inventors: TORU TAZAWA, HIROSHI FUJIWARA, MASARU NISHIZONO
  • Publication number: 20160288845
    Abstract: A machine body has a front-rear direction and a right-left direction perpendicular to the front-rear direction. The machine body has right and left sides in the right-left direction. A cabin is mounted in the machine body between the right and left sides. Right and left traveling devices are arranged respectively on the right and left sides of the machine body. A boom has a front end part in the front-rear direction to be connected to a working tool. A first wall is provided on one side of the boom in the right-left direction. A second wall is provided on another side opposite to the one side with respect to the boom in the right-left direction. A urea aqueous solution tank is provided between the first and second walls to store a urea aqueous solution.
    Type: Application
    Filed: March 30, 2016
    Publication date: October 6, 2016
    Applicant: Kubota Corporation
    Inventors: Keigo HONDA, Hiroaki NAKAGAWA, Daisuke SAKURAI, Hiroshi FUJIWARA
  • Patent number: 9423786
    Abstract: A motor drive device (2) of the present invention includes a command response setting unit (22), a position and speed controller (23), a load characteristic compensator (24), a servo adjuster (6), a command response setting function (221), a stiffness setting function (231), an evaluation indicator measuring function (27), and a storage (28). The servo adjuster (6) stores a plurality of command response indicators (61) and a plurality of stiffness indicators (62). The servo adjuster (6) also generates an evaluation indicator measuring pattern (63) by a combination of each command response indicator (61) and each stiffness indicator (62). A motor (3) is driven in accordance with the generated evaluation indicator measuring pattern (63) while the command response indicators (61) and the stiffness indicators (62) are sequentially changed.
    Type: Grant
    Filed: April 9, 2014
    Date of Patent: August 23, 2016
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yu-Suke Imada, Kenichi Suzuki, Masaru Nishizono, Hiroshi Fujiwara
  • Patent number: 9423782
    Abstract: Motor drive device (30) according to the present invention includes operation pattern generator (1), position and speed controller (23), load characteristic compensator (24), and load characteristic measurement unit (7). Operation pattern generator (1) increases an absolute value of acceleration, at which a motor speed or a motor position is changed, in each operation pattern. Load characteristic measurement unit (7) measures the load characteristic to set load characteristic compensator (24) when torque command indicator is less than or equal to a torque limit value. Load characteristic measurement unit (7) ends the measurement of the load characteristic without setting load characteristic compensator (24) when the torque command indicator is greater than the torque limit value.
    Type: Grant
    Filed: April 9, 2014
    Date of Patent: August 23, 2016
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yu-suke Imada, Kenichi Suzuki, Masaru Nishizono, Hiroshi Fujiwara
  • Patent number: 9366996
    Abstract: A sealing structure includes a housing to accommodate powder, a powder roller having a surface to bear and convey the powder, and an entrance seal disposed between the powder roller and the housing to allow powder remaining on a circumferential surface of the powder roller to enter the housing. A pair of left and right edge seals is provided in a circumferential direction of the powder roller to overlap with outer circumferential surfaces of both ends of the entrance seal, respectively. Both ends of the entrance seal include powder damming sections extended from both ends thereof along the pair of left and right edge seals, respectively. A pair of inner edges of the respective powder damming sections is each sandwiched between a corresponding one of the pair of left and right edge seals and the powder roller while substantially symmetrically inclining from the rotation direction of the powder roller.
    Type: Grant
    Filed: February 13, 2015
    Date of Patent: June 14, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Akinori Harada, Tomohiro Kubota, Hiroshi Fujiwara
  • Publication number: 20160070252
    Abstract: A motor drive device (2) of the present invention includes a command response setting unit (22), a position and speed controller (23), a load characteristic compensator (24), a servo adjuster (6), a command response setting function (221), a stiffness setting function (231), an evaluation indicator measuring function (27), and a storage (28). The servo adjuster (6) stores a plurality of command response indicators (61) and a plurality of stiffness indicators (62). The servo adjuster (6) also generates an evaluation indicator measuring pattern (63) by a combination of each command response indicator (61) and each stiffness indicator (62). A motor (3) is driven in accordance with the generated evaluation indicator measuring pattern (63) while the command response indicators (61) and the stiffness indicators (62) are sequentially changed.
    Type: Application
    Filed: April 9, 2014
    Publication date: March 10, 2016
    Inventors: YU-SUKE IMADA, KENICHI SUZUKI, MASARU NISHIZONO, HIROSHI FUJIWARA
  • Publication number: 20160048116
    Abstract: Motor drive device (30) according to the present invention includes operation pattern generator (1), position and speed controller (23), load characteristic compensator (24), and load characteristic measurement unit (7). Operation pattern generator (1) increases an absolute value of acceleration, at which a motor speed or a motor position is changed, in each operation pattern. Load characteristic measurement unit (7) measures the load characteristic to set load characteristic compensator (24) when torque command indicator is less than or equal to a torque limit value. Load characteristic measurement unit (7) ends the measurement of the load characteristic without setting load characteristic compensator (24) when the torque command indicator is greater than the torque limit value.
    Type: Application
    Filed: April 9, 2014
    Publication date: February 18, 2016
    Inventors: YU-SUKE IMADA, KENICHI SUZUKI, MASARU NISHIZONO, HIROSHI FUJIWARA
  • Publication number: 20150344727
    Abstract: A catalyst containing a quaternary ammonium salt represented by the following general formula (1) is used as a catalyst for dissociation of a blocking agent. [In the formula, each of R1 to R3 represents an aliphatic hydrocarbon group having 1 to 8 carbon atoms or an aromatic hydrocarbon group having 6 to 14 carbon atoms; R4 represents an aliphatic hydrocarbon group having 9 to 20 carbon atoms; X represents at least one member selected from the group consisting of a phosphate group, a borate group, a hydrogencarbonate group, a monoalkylcarbonate group and a carbonate group; a is an integer in the range of 1 to 3; and b is an integer in the range of 1 to 3.
    Type: Application
    Filed: December 19, 2013
    Publication date: December 3, 2015
    Applicant: Tosoh Corporation
    Inventors: Hiroshi FUJIWARA, Hiroyuki KISO
  • Patent number: 9187280
    Abstract: A sheet feeding device includes a feeding device and a detector. The feeding device is configured to feed a sheet to a destination. The detector is configured to detect the sheet at the destination. If the detector does not detect the sheet within a predetermined time after the start of preparation for a feeding operation by the feeding device, it is determined that the sheet is misfed. Further, the start of the feeding operation of a sheet is changed in accordance with the result of detection by the detector of the presence or absence of a sheet standing by at the destination.
    Type: Grant
    Filed: December 7, 2011
    Date of Patent: November 17, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshikane Nishii, Hiroshi Fujiwara, Tomoyoshi Yamazaki, Haruyuki Honda, Mizuna Tanaka
  • Patent number: 9179842
    Abstract: An optical tomography device 1 is provided as one capable of obtaining tomographic information of a measuring object with higher accuracy. In the optical tomography device 1, numerical apertures of reception fibers 12, 13 are different from each other. Therefore, the device has a configuration wherein the reception fibers 12, 13 receive two kinds of respective light beams with different solid angle distributions, whereby the device can also obtain angular information, in addition to intensity information of light emerging from a measuring object 100. As a result, the accuracy is enhanced for an analysis about the tomographic information of the measuring object.
    Type: Grant
    Filed: May 9, 2012
    Date of Patent: November 10, 2015
    Assignees: Sumitomo Electric Industries, Ltd., Kyoto University
    Inventors: Haruo Nakaji, Hidenao Fukuyama, Yuusuke Iso, Shinichi Urayama, Naoya Oishi, Hiroshi Fujiwara
  • Publication number: 20150234324
    Abstract: A sealing structure includes a housing to accommodate powder, a powder roller having a surface to bear and convey the powder, and an entrance seal disposed between the powder roller and the housing to allow powder remaining on a circumferential surface of the powder roller to enter the housing. A pair of left and right edge seals is provided in a circumferential direction of the powder roller to overlap with outer circumferential surfaces of both ends of the entrance seal, respectively. Both ends of the entrance seal include powder damming sections extended from both ends thereof along the pair of left and right edge seals, respectively. A pair of inner edges of the respective powder damming sections is each sandwiched between a corresponding one of the pair of left and right edge seals and the powder roller while substantially symmetrically inclining from the rotation direction of the powder roller.
    Type: Application
    Filed: February 13, 2015
    Publication date: August 20, 2015
    Applicant: Ricoh Company, Ltd.
    Inventors: Akinori Harada, Tomohiro Kubota, Hiroshi Fujiwara
  • Patent number: 8975849
    Abstract: There are provided a first notch filter disposed in a feedback control system, an oscillation extracting filter for outputting signal x1 containing an oscillation component, a second notch filter for inputting signal x1, a notch control portion for changing a notch center frequency based on signal x1 and second notch filter output signal x2, a notch depth control portion for changing a notch depth of the first notch filter based on signal x1, and a control determining portion for carrying out control to operate either the notch control portion or the notch depth control portion.
    Type: Grant
    Filed: May 25, 2011
    Date of Patent: March 10, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Hiroshi Fujiwara, Toru Tazawa
  • Patent number: 8907955
    Abstract: A vector image drawing device has the following configuration. A contour generation unit (104), based on vector data, generates contour data that represents the starting pixels on a scan line in a drawing area where fill-in starts, and the ending pixels where fill-in ends. An outline buffer (106) stores the number of starting or ending pixels in the contour data for fill-in for each drawn pixel. An error judgment unit (2), when storing the contour data in the outline buffer (106), determines in which pixel there is overflow in the outline buffer of contour data. A pixel position transfer unit (3) adds the numerical value of the overflow portion of a pixel that the error judgment unit (2) determined to have overflow to the numerical value of contour data that corresponds to a pixel.
    Type: Grant
    Filed: November 9, 2009
    Date of Patent: December 9, 2014
    Assignees: NEC Soft, Ltd., NEC Solution Innovators, Ltd.
    Inventor: Hiroshi Fujiwara
  • Patent number: 8901872
    Abstract: There are provided: a plurality of notch filters which are arranged inside a control system for feedback-controlling a moving operation of a moving section of a motor and attenuate signal components having near frequencies with a notch frequency at a center in an input signal; a plurality of oscillation extracting filters which are set with different frequency bands as being corresponded to the respective notch filters and extract oscillating components in the set frequency bands from a speed detection signal; and a plurality of notch controlling sections which are arranged with respect to the respective oscillation extracting filters and control the notch frequencies of the corresponding notch filters so as to decrease amplitudes of the oscillating components extracted by the oscillation extracting filters.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: December 2, 2014
    Assignee: Panasonic Corporation
    Inventors: Toru Tazawa, Hiroshi Fujiwara, Masaru Nishizono
  • Patent number: 8807552
    Abstract: A base plate is selectively attached to a lower surface of a main body of an image forming apparatus or to an optional sheet feeder attachable to the main body.
    Type: Grant
    Filed: May 28, 2009
    Date of Patent: August 19, 2014
    Assignee: Ricoh Company, Limited
    Inventors: Kazuyoshi Kondo, Yasuo Matsuyama, Hiroshi Fujiwara, Yasuhide Ohkubo, Ippei Kimura, Toshikane Nishii, Mizuna Tanaka, Tomoyoshi Yamazaki, Haruyuki Honda, Masafumi Takahira
  • Publication number: 20140168657
    Abstract: An optical tomography device 1 is provided as one capable of obtaining tomographic information of a measuring object with higher accuracy. In the optical tomography device 1, numerical apertures of reception fibers 12, 13 are different from each other. Therefore, the device has a configuration wherein the reception fibers 12, 13 receive two kinds of respective light beams with different solid angle distributions, whereby the device can also obtain angular information, in addition to intensity information of light emerging from a measuring object 100. As a result, the accuracy is enhanced for an analysis about the tomographic information of the measuring object.
    Type: Application
    Filed: May 9, 2012
    Publication date: June 19, 2014
    Applicants: Kyoto University, Sumitomo Electric Industries, Ltd.
    Inventors: Haruo Nakaji, Hidenao Fukuyama, Yuusuke Iso, Shinichi Urayama, Naoya Oishi, Hiroshi Fujiwara
  • Patent number: 8752824
    Abstract: A sheet inverting device includes a loop pathway including an entrance slot to which a recording medium is conveyed and an exit slot from which the recording medium is conveyed, the loop pathway forming a loop shape to convey the recording medium therethrough in a forward direction defined by a sheet conveyance direction in which the recording medium is conveyed from the entrance slot travels, and a redirectable sheet conveyance member to convey the recording medium traveling through the loop pathway in the forward direction and a reverse direction that is the reverse of the forward direction. The exit slot is configured to convey the recording medium that is conveyed by the redirectable sheet conveyance member in the reverse direction outside the sheet inverting device therethrough.
    Type: Grant
    Filed: May 18, 2011
    Date of Patent: June 17, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroshi Fujiwara, Tomoyoshi Yamazaki, Haruyuki Honda, Toshikane Nishii, Mizuna Tanaka