Patents by Inventor Tadashi Kawaguchi

Tadashi Kawaguchi 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: 10407865
    Abstract: A control system includes: a first hydraulic pump and a second hydraulic pump; a passage connecting the first hydraulic pump and the second hydraulic pump with each other; an opening/closing device provided in the passage and configured to open and close the passage; a control device configured to control the opening/closing device to switch between a split-flow state in which the passage is closed and a connected state in which the passage is open; a first actuator to which hydraulic fluid discharged from the first hydraulic pump is supplied in the split-flow state; and a second actuator to which hydraulic fluid discharged from the second hydraulic pump is supplied in the split-flow state. In the connected state, the control device controls the opening/closing device so that the connected state is maintained even when either one of the first actuator and the second actuator is brought into a driven state.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: September 10, 2019
    Assignee: Komatsu Ltd.
    Inventors: Yuta Kamoshita, Tadashi Kawaguchi, Teruo Akiyama, Kenji Oshima
  • Patent number: 10407875
    Abstract: A control system includes: calculating a distribution flow rate of hydraulic fluid to be supplied to first and second hydraulic actuators based on a pressure of hydraulic fluid in the first and second hydraulic actuators and an operation amount operated to drive the first and second hydraulic actuators; calculating merged-state pump output indicating outputs of first and second hydraulic pumps required in a merged state based on the distribution flow rate; calculating separated-state pump output indicating outputs of the first and second hydraulic pumps required in the separated state based on the distribution flow rate; calculating excessive output of an engine based on the merged-state pump output and the separated-state pump output; calculating reduced output of the engine more reduced than target output by correcting the target output of the engine based on the excessive output; and controlling the engine based on the reduced output in the separated state.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: September 10, 2019
    Assignee: Komatsu Ltd.
    Inventors: Tadashi Kawaguchi, Yuta Kamoshita, Kenji Oshima
  • Patent number: 10385545
    Abstract: A control system includes a cylinder pressure data acquisition unit that acquires cylinder pressure data indicating a pressure of operating oil of a hydraulic cylinder; an operation amount data acquisition unit that acquires operation amount data of an operating device; a pump flow rate calculation unit that calculates a first pump flow rate indicating a flow rate of the operating oil discharged from a first hydraulic pump and a second pump flow rate indicating a flow rate of the operating oil discharged from a second hydraulic pump in a splitting state in which a passage is closed based on the cylinder pressure data and the operation amount data; and a pump control unit that controls the first hydraulic pump and the second hydraulic pump based on the first pump flow rate and the second pump flow rate.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: August 20, 2019
    Assignee: Komatsu Ltd.
    Inventors: Yuta Kamoshita, Tadashi Kawaguchi, Teruo Akiyama
  • Patent number: 10344781
    Abstract: A control system for controlling a work machine including a working unit including elements and actuators that drives the elements includes: a first hydraulic pump and a second hydraulic pump each of which supplies operating oil to at least one of the actuators; and a control device that calculates a distribution flow rate of operating oil distributed to each of the actuators based on an operating state of the working unit and switches, based on the calculated distribution flow rate, between a first state in which the operating oil supplied from both the first hydraulic pump and the second hydraulic pump is supplied to the actuators and a second state in which the actuator to which the operating oil is supplied from the first hydraulic pump is different from the actuator to which the operating oil is supplied from the second hydraulic pump.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: July 9, 2019
    Assignee: Komatsu Ltd.
    Inventors: Yuta Kamoshita, Tadashi Kawaguchi, Teruo Akiyama, Kenji Oshima, Koji Saito, Noboru Iida
  • Patent number: 10244128
    Abstract: An image forming system that is capable of preventing obstruction of transmission of a packet to an information processing apparatus from a USB device supporting USBNW due to the shift to the sleep mode. The image forming system includes an information processing apparatus, an image forming apparatus with a sleep mode, and a USB device that is connected to the information processing apparatus through the image forming apparatus and is controlled by the information processing apparatus. The image forming apparatus includes a first determination unit that determines whether the USB device supports USBNW, a second determination unit that determines whether a packet received from the information processing apparatus is processed by a module supporting USBNW, and a control unit that prohibits the image forming apparatus from shifting to the sleep mode when the USB device supports USBNW and when the packet is processed by the module supporting USBNW.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: March 26, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Tadashi Kawaguchi
  • Publication number: 20180305899
    Abstract: A control system includes: calculating a distribution flow rate of hydraulic fluid to be supplied to first and second hydraulic actuators based on a pressure of hydraulic fluid in the first and second hydraulic actuators and an operation amount operated to drive the first and second hydraulic actuators; calculating merged-state pump output indicating outputs of first and second hydraulic pumps required in a merged state based on the distribution flow rate; calculating separated-state pump output indicating outputs of the first and second hydraulic pumps required in the separated state based on the distribution flow rate; calculating excessive output of an engine based on the merged-state pump output and the separated-state pump output; calculating reduced output of the engine more reduced than target output by correcting the target output of the engine based on the excessive output; and controlling the engine based on the reduced output in the separated state.
    Type: Application
    Filed: April 24, 2017
    Publication date: October 25, 2018
    Inventors: Tadashi Kawaguchi, Yuta Kamoshita, Kenji Oshima
  • Publication number: 20180230670
    Abstract: A control system includes: a first hydraulic pump and a second hydraulic pump; a passage connecting the first hydraulic pump and the second hydraulic pump with each other; an opening/closing device provided in the passage and configured to open and close the passage; a control device configured to control the opening/closing device to switch between a split-flow state in which the passage is closed and a connected state in which the passage is open; a first actuator to which hydraulic fluid discharged from the first hydraulic pump is supplied in the split-flow state; and a second actuator to which hydraulic fluid discharged from the second hydraulic pump is supplied in the split-flow state. In the connected state, the control device controls the opening/closing device so that the connected state is maintained even when either one of the first actuator and the second actuator is brought into a driven state.
    Type: Application
    Filed: August 26, 2016
    Publication date: August 16, 2018
    Inventors: Yuta Kamoshita, Tadashi Kawaguchi, Teruo Akiyama, Kenji Oshima
  • Publication number: 20180216637
    Abstract: A control system for controlling a work machine including a working unit including elements and actuators that drives the elements includes: a first hydraulic pump and a second hydraulic pump each of which supplies operating oil to at least one of the actuators; and a control device that calculates a distribution flow rate of operating oil distributed to each of the actuators based on an operating state of the working unit and switches, based on the calculated distribution flow rate, between a first state in which the operating oil supplied from both the first hydraulic pump and the second hydraulic pump is supplied to the actuators and a second state in which the actuator to which the operating oil is supplied from the first hydraulic pump is different from the actuator to which the operating oil is supplied from the second hydraulic pump.
    Type: Application
    Filed: July 29, 2016
    Publication date: August 2, 2018
    Applicant: Komatsu Ltd.
    Inventors: Yuta Kamoshita, Tadashi Kawaguchi, Teruo Akiyama, Kenji Oshima, Koji Saito, Noboru Iida
  • Patent number: 10017917
    Abstract: A drive device of a construction machine includes a pump passage connected to a hydraulic pump, first and second supply passages connected to the pump passage, first and second passages connected to the first supply passage, third and fourth passages connected to the second supply passage, a first valve connected to the first and third passages, a second valve connected to the second and fourth passages, a first bucket passage connecting the first passage to a cap-side space of the bucket cylinder through the first valve, a second bucket passage connecting the third passage to a rod-side space of the bucket cylinder through the first valve, a first arm passage connecting the second passage to a rod-side space of an arm cylinder through the second valve, and a second arm passage connecting the fourth passage to a cap-side space of the arm cylinder through the second valve.
    Type: Grant
    Filed: October 28, 2015
    Date of Patent: July 10, 2018
    Assignee: Komatsu Ltd.
    Inventors: Tadashi Kawaguchi, Teruo Akiyama, Koji Saito, Takayuki Watanabe, Noboru Iida
  • Patent number: 9992368
    Abstract: A communication control method which prevents control over a USB device from being hampered and reducing power consumption at the same time. When the USB device and a control apparatus, which controls the USB device, are connected to the printing apparatus, and a communication via the printing apparatus is being carried out, the printing apparatus and the USB device are not shifted into a power saving mode in which energization of the printing apparatus and the USB device is limited. When the USB device and the control apparatus are connected to the printing apparatus, and a communication via the printing apparatus is not being carried out, the printing apparatus and the USB device are shifted into the power saving mode.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: June 5, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Tadashi Kawaguchi
  • Publication number: 20180058041
    Abstract: A control system includes: first and second hydraulic pumps; an opening/closing device provided in a passage connecting the first and second hydraulic pumps and configured to open and close the passage; a control device controlling the opening/closing device to switch between connected and unconnected states of the first and second hydraulic pumps; a first hydraulic cylinder to which hydraulic fluid from the first hydraulic pump is supplied in the unconnected state; and a second hydraulic cylinder to which hydraulic fluid from the second hydraulic pump is supplied in the unconnected state. The control device controls the opening/closing device to be in the connected state when distributed flow rates of the hydraulic cylinders are a predetermined supply flow rate or lower and a difference between a pressure in a rod-side space and a pressure in a cap-side space of the hydraulic cylinder is a defined value or smaller.
    Type: Application
    Filed: August 26, 2016
    Publication date: March 1, 2018
    Inventors: Yuta Kamoshita, Tadashi Kawaguchi, Teruo Akiyama, Kenji Oshima
  • Publication number: 20180030692
    Abstract: A control system includes a cylinder pressure data acquisition unit that acquires cylinder pressure data indicating a pressure of operating oil of a hydraulic cylinder; an operation amount data acquisition unit that acquires operation amount data of an operating device; a pump flow rate calculation unit that calculates a first pump flow rate indicating a flow rate of the operating oil discharged from a first hydraulic pump and a second pump flow rate indicating a flow rate of the operating oil discharged from a second hydraulic pump in a splitting state in which a passage is closed based on the cylinder pressure data and the operation amount data; and a pump control unit that controls the first hydraulic pump and the second hydraulic pump based on the first pump flow rate and the second pump flow rate.
    Type: Application
    Filed: July 29, 2016
    Publication date: February 1, 2018
    Inventors: Yuta Kamoshita, Tadashi Kawaguchi, Teruo Akiyama
  • Publication number: 20170354995
    Abstract: A sponge roller is made of a polyvinyl acetal porous resin material having elasticity in a wet state, includes a roller in an approximate cylinder form and a plurality of protrusions formed integrally on an outer peripheral surface of the roller, and rotates the multiple protrusions to make contact with a surface to be cleaned so as to clean the surface. The polyvinyl acetal porous resin material constituting the sponge roller contains a cationic functional group.
    Type: Application
    Filed: August 29, 2017
    Publication date: December 14, 2017
    Inventors: Yuuichi SHIMAZAKI, Tadashi KAWAGUCHI, Hidehiko TSUKADA
  • Patent number: 9825621
    Abstract: An information processing apparatus which is capable of maintaining the amount of radiation noise from a semiconductor integrated circuit constant. A voltage value information storage unit holds information indicative of a voltage to be applied to the semiconductor integrated circuit. A sub CPU modulates a clock frequency of a clock to be supplied to the semiconductor integrated circuit with a modulation width determined based on the information held in the voltage value information storage unit and supplies the clock.
    Type: Grant
    Filed: February 2, 2016
    Date of Patent: November 21, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Tadashi Kawaguchi
  • Publication number: 20170264757
    Abstract: An image forming system that is capable of preventing obstruction of transmission of a packet to an information processing apparatus from a USB device supporting USBNW due to the shift to the sleep mode. The image forming system includes an information processing apparatus, an image forming apparatus with a sleep mode, and a USB device that is connected to the information processing apparatus through the image forming apparatus and is controlled by the information processing apparatus. The image forming apparatus includes a first determination unit that determines whether the USB device supports USBNW, a second determination unit that determines whether a packet received from the information processing apparatus is processed by a module supporting USBNW, and a control unit that prohibits the image forming apparatus from shifting to the sleep mode when the USB device supports USBNW and when the packet is processed by the module supporting USBNW.
    Type: Application
    Filed: May 30, 2017
    Publication date: September 14, 2017
    Inventor: Tadashi Kawaguchi
  • Publication number: 20170230524
    Abstract: A communication control method which prevents control over a USB device from being hampered and reducing power consumption at the same time. When the USB device and a control apparatus, which controls the USB device, are connected to the printing apparatus, and a communication via the printing apparatus is being carried out, the printing apparatus and the USB device are not shifted into a power saving mode in which energization of the printing apparatus and the USB device is limited. When the USB device and the control apparatus are connected to the printing apparatus, and a communication via the printing apparatus is not being carried out, the printing apparatus and the USB device are shifted into the power saving mode.
    Type: Application
    Filed: January 27, 2017
    Publication date: August 10, 2017
    Inventor: Tadashi Kawaguchi
  • Publication number: 20170203753
    Abstract: A hybrid work machine engine control device which is mounted on a hybrid work machine having a working unit that operates with operating oil supplied from a hydraulic pump and which controls an internal combustion engine that drives a generator motor and the hydraulic pump with generated power, includes: a processing unit that increases torque required for the generator motor to generate electric power with a lapse of time and decreases absorption torque that the hydraulic pump absorbs when the generator motor generates electric power during operation of the internal combustion engine.
    Type: Application
    Filed: January 20, 2016
    Publication date: July 20, 2017
    Inventors: Tomotaka Imai, Tsubasa Ohira, Masaru Shizume, Tadashi Kawaguchi
  • Patent number: 9654038
    Abstract: A control device of an electric motor includes: an operating state setting unit configured to set an operating state; a maximum output acquiring unit configured to acquire maximum output of the electric motor that is preset according to the operating state set; a speed detecting unit configured to detect a speed of the electric motor; a torque limit value calculating unit configured to calculate a torque limit value based on the speed and the maximum output; and a torque limiting unit configured to limit torque of the electric motor by the torque limit value when accelerating the electric motor.
    Type: Grant
    Filed: April 16, 2012
    Date of Patent: May 16, 2017
    Assignee: Komatsu Ltd.
    Inventors: Tadashi Kawaguchi, Kazuki Takehara, Jun Morinaga
  • Publication number: 20170121940
    Abstract: A drive device of a construction machine includes a pump passage connected to a hydraulic pump, first and second supply passages connected to the pump passage, first and second passages connected to the first supply passage, third and fourth passages connected to the second supply passage, a first valve connected to the first and third passages, a second valve connected to the second and fourth passages, a first bucket passage connecting the first passage to a cap-side space of the bucket cylinder through the first valve, a second bucket passage connecting the third passage to a rod-side space of the bucket cylinder through the first valve, a first arm passage connecting the second passage to a rod-side space of an arm cylinder through the second valve, and a second arm passage connecting the fourth passage to a cap-side space of the arm cylinder through the second valve.
    Type: Application
    Filed: October 28, 2015
    Publication date: May 4, 2017
    Inventors: Tadashi Kawaguchi, Teruo Akiyama, Koji Saito, Takayuki Watanabe, Noboru Iida
  • Patent number: 9617713
    Abstract: A control device of an electric actuator adapted to perform a forward-reverse movement includes a control unit adapted to be operated in a forward direction or a reverse direction in accordance with the forward-reverse movement of the electric actuator. It also includes a pilot circuit, which is connected to the control unit and which generates a forward pilot pressure or a reverse pilot pressure in accordance with the forward operation or the reverse operation of the control unit. The control device has a differential pressure acquiring unit that acquires a differential pressure between a pilot pressure corresponding to an operation direction of the control unit and a pilot pressure, in a direction opposite to the operation direction, and it has a control command generator that generates a control command for controlling the electric actuator based on the differential pressure acquired by the differential pressure acquiring unit.
    Type: Grant
    Filed: May 11, 2011
    Date of Patent: April 11, 2017
    Assignee: Komatsu Ltd.
    Inventors: Hiroaki Take, Tadashi Kawaguchi, Jun Morinaga