Patents by Inventor Koji Hyodo

Koji Hyodo 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: 20200011025
    Abstract: The work vehicle includes an engine, a radiator; a hydraulic pump; a cooling fan that blows a cooling air to the radiator; a hydraulic motor which is driven by a pressure oil delivered from the hydraulic pump, and rotates the cooling fan; a directional control valve that switches a flow direction of the pressure oil from the hydraulic pump to rotate the hydraulic motor in forward and reverse directions; and a controller that controls the directional control valve so as to cause the repetitive operation of the forward and reverse rotation of the cooling fan to be performed at predetermined time intervals, in which the controller reduces the time intervals more than a normal time initially set when a relationship between the outside air temperature detected by the outside air temperature sensor and the refrigerant temperature detected by the refrigerant temperature sensor satisfies a predetermined condition.
    Type: Application
    Filed: September 4, 2018
    Publication date: January 9, 2020
    Inventors: Koji HYODO, Isamu AOKI, Tetsuji TANAKA, Koji SHIMAZAKI
  • Patent number: 10392781
    Abstract: To improve working efficiency in an eco mode when a power mode and the eco mode have been set in a wheel loader, the wheel loader is provided with a controller having an eco mode characteristic line, a power mode characteristic line, and a lifting operation characteristic line having a matching point C located between a matching point A between a working device operating engine torque characteristic line and the eco mode characteristic line and a matching point B between the working device operating engine torque characteristic line and the power mode characteristic line. The controller includes a control portion, which controls a HST pump in accordance with the lifting operation characteristic line when lifting operation of a lift arm is detected while the eco mode has been selected by a work mode selecting portion.
    Type: Grant
    Filed: February 28, 2019
    Date of Patent: August 27, 2019
    Assignee: KCM Corporation
    Inventors: Kohtaroh Uno, Shoroku Kawahara, Keigo Kikuchi, Koji Hyodo, Atsushi Shimazu
  • Publication number: 20190226179
    Abstract: To improve working efficiency in an eco mode when a power mode and the eco mode have been set in a wheel loader, the wheel loader is provided with a controller having an eco mode characteristic line, a power mode characteristic line, and a lifting operation characteristic line having a matching point C located between a matching point A between a working device operating engine torque characteristic line and the eco mode characteristic line and a matching point B between the working device operating engine torque characteristic line and the power mode characteristic line. The controller includes a control portion, which controls a HST pump in accordance with the lifting operation characteristic line when lifting operation of a lift arm is detected while the eco mode has been selected by a work mode selecting portion.
    Type: Application
    Filed: February 28, 2019
    Publication date: July 25, 2019
    Applicant: KCM Corporation
    Inventors: Kohtaroh UNO, Shoroku KAWAHARA, Keigo KIKUCHI, Koji HYODO, Atsushi SHIMAZU
  • Patent number: 10358794
    Abstract: A work vehicle, includes: a lift arm rotatably linked to a front portion of a vehicle body of a work vehicle so as to be allowed to swing along an up/down direction; an operation lever that can be operated within a range between a raising operation end position and a lowering operation end position, and is operated to raise and lower the lift arm; an up detent mechanism having a holding function for holding the operation lever at the raising operation end position once the operation lever is operated to the raising operation end position; and a down detent mechanism having a holding function for holding the operation lever at the lowering operation end position once the operation lever is operated to the lowering operation end position, wherein: when an angle of the lift arm becomes greater than a predetermined upper limit, the holding function of the up detent mechanism and the holding function of the down detent mechanism are disengaged.
    Type: Grant
    Filed: May 13, 2015
    Date of Patent: July 23, 2019
    Assignee: KCM Corporation
    Inventors: Tetsuji Tanaka, Yasunori Miyamoto, Koji Hyodo, Isamu Aoki, Katsuyuki Kirita, Hiroaki Yada, Seiji Nakagawa, Masaki Yoshikawa
  • Patent number: 10071629
    Abstract: A prime mover control device of a work vehicle equipped with a torque converter includes: a speed ratio calculation unit that calculates a speed ratio of the torque converter; and a rotational speed limit unit that, when a speed ratio falls within a preset speed ratio range, limits a maximum rotational speed of the prime mover to be lower as compared with a maximum rotational speed set when a speed ratio falls without the preset speed ratio range. When a state in which the speed ratio calculated by the speed ratio calculation unit falls within the preset speed ratio range is maintained for a predetermined time period, the rotational speed limit unit changes a maximum rotational speed of the prime mover to a higher maximum rotational speed than the limited maximum rotational speed limited to be lower by the rotational speed limit unit.
    Type: Grant
    Filed: November 30, 2015
    Date of Patent: September 11, 2018
    Assignee: KCM Corporation
    Inventors: Isamu Aoki, Koji Hyodo, Tetsuji Tanaka, Masaki Nukii
  • Publication number: 20180251957
    Abstract: To reduce increase of the temperature of a control device of a supercharger and increase the lifetime of the control device of the supercharger, a work machine includes a variable geometry supercharger having changeable supercharge pressure and a working device. The work machine includes a variable displacement work hydraulic pump configured to be driven by an engine and supply pressure oil to an actuator configured to drive the working device; a supercharger control device configured to control the supercharger; a temperature detection device configured to detect the temperature of the supercharger control device; and a main control device configured to restrict, in case the temperature of the supercharger control device is higher than a first temperature, a maximum absorbing torque of the work hydraulic pump as compared to case the temperature of the supercharger control device is lower than the first temperature.
    Type: Application
    Filed: December 14, 2016
    Publication date: September 6, 2018
    Inventor: Koji HYODO
  • Publication number: 20180252314
    Abstract: To curb temperature rises in a control device for a supercharger and extend the life of the control device for the supercharger, a work vehicle includes a variable geometry supercharger with variable boost pressure, and a working device driven by pressure oil discharged from a working hydraulic pump, the work vehicle further including: a supercharger control device adapted to control the supercharger; a temperature detection device adapted to detect temperature of the supercharger control device; and a main control device adapted to limit at least one of maximum rotational speed of an engine and maximum vehicle speed of the work vehicle in case the temperature of the supercharger control device is above a predetermined temperature as compared to case the temperature of the supercharger control device is below the predetermined temperature.
    Type: Application
    Filed: December 14, 2016
    Publication date: September 6, 2018
    Inventors: Koji HYODO, Masashi YAMASHITA, Tetsuji TANAKA, Katsutaka HARA, Masaki NUKII, Isamu AOKI
  • Publication number: 20180251026
    Abstract: The present invention relates to a work vehicle including an engine, a hydraulic pump, a hydraulic motor to drive wheels, an HST circuit in which the hydraulic pump and the hydraulic motor are connected to each other in the form of a closed circuit, a reducing agent sensor that detects the state of a reducing agent used to clean exhaust gas from the engine, and an engine restrictor that restricts the rotational speed of the engine based on the output from the reducing agent sensor, and the work vehicle further includes a control unit that changes the tilting angle of the hydraulic pump or the hydraulic motor independently of the rotational speed of the engine to a tilting angle associated with minimum travel drive force necessary for self-travel of the work vehicle when the control unit determines that the engine restrictor has restricted the rotational speed of the engine.
    Type: Application
    Filed: February 8, 2017
    Publication date: September 6, 2018
    Inventors: Masaki NUKII, Koji HYODO, Isamu AOKI, Tetsuji TANAKA
  • Patent number: 9810164
    Abstract: A prime mover control device for a work vehicle, includes: a rotation speed control unit that controls a rotation speed of a prime mover in correspondence to an operation quantity of an accelerator operation member; a temperature detection unit that detects a temperature of cooling oil used to cool a brake; and a speed limiting unit that limits a maximum rotation speed of the prime mover by setting a lower limit for the maximum rotation speed when the temperature of the cooling oil detected by the temperature detection unit is higher than a predetermined temperature, compared to a limit set when the temperature of the cooling oil detected by the temperature detection unit is lower than the predetermined temperature, wherein: a maximum vehicle speed is limited by limiting the maximum rotation speed of the prime mover by the speed limiting unit.
    Type: Grant
    Filed: January 28, 2015
    Date of Patent: November 7, 2017
    Assignee: KCM Corporation
    Inventors: Isamu Aoki, Koji Hyodo, Tetsuji Tanaka, Kentaro Oomae
  • Publication number: 20170274770
    Abstract: A prime mover control device of a work vehicle equipped with a torque converter includes: a speed ratio calculation unit that calculates a speed ratio of the torque converter; and a rotational speed limit unit that, when a speed ratio falls within a preset speed ratio range, limits a maximum rotational speed of the prime mover to be lower as compared with a maximum rotational speed set when a speed ratio falls without the preset speed ratio range. When a state in which the speed ratio calculated by the speed ratio calculation unit falls within the preset speed ratio range is maintained for a predetermined time period, the rotational speed limit unit changes a maximum rotational speed of the prime mover to a higher maximum rotational speed than the limited maximum rotational speed limited to be lower by the rotational speed limit unit.
    Type: Application
    Filed: November 30, 2015
    Publication date: September 28, 2017
    Applicant: KCM Corporation
    Inventors: Isamu AOKI, Koji HYODO, Tetsuji TANAKA, Masaki NUKII
  • Patent number: 9644547
    Abstract: An engine control device for a work vehicle decides that an idling stop condition is established when the front device is in the unengaged state, the steering device is in the unengaged state, the accelerator pedal is in the non-operation state, either the transmission is in the neutral state or the parking brake device is in the engaged state or the transmission is in the neutral state and also the parking brake device is in the engaged state, and the service brake device is in the unengaged state, and stops an engine when it is decided that it passes the predetermined length of time since it was decided that the idling stop condition was established.
    Type: Grant
    Filed: November 15, 2012
    Date of Patent: May 9, 2017
    Assignee: KCM Corporation
    Inventors: Koji Hyodo, Masaki Yoshikawa, Isamu Aoki, Tetsuji Tanaka
  • Patent number: 9617716
    Abstract: A work vehicle includes: a hydraulic pump driven by an engine; a rotational speed detection unit that detects an actual rotational speed of the engine; an exhaust gas purification device that purifies nitrogen oxide in exhaust gas discharged from the engine using a reducing agent solution stored in a reducing agent tank; a torque control unit that decreases output torque of the engine according to decrease of a detected remaining amount of the reducing agent solution; and a storage device that stores a threshold value not less than an engine rotational speed at which the hydraulic pump starts discharge, wherein when the actual rotational speed of the engine is not more than the threshold value, the torque control unit does not decrease the output torque of the engine regardless of the remaining amount of the reducing agent solution detected by the remaining amount detection device.
    Type: Grant
    Filed: October 3, 2014
    Date of Patent: April 11, 2017
    Assignee: KCM Corporation
    Inventors: Koji Hyodo, Atsushi Shimazu, Masashi Yamashita, Tetsuji Tanaka, Isamu Aoki, Shoroku Kawahara
  • Publication number: 20170073923
    Abstract: Provided is a work vehicle which is capable of appropriately setting the height of a work tool as a control threshold value for a ride control device or an automatic transmission control device, and which is excellent in operability, travel stability, and work efficiency. A value detected by an angle sensor (39) when a signal import switch (46) is operated by an operator is stored in a height position storage unit (35b) of a main controller (35) as height position information about a bucket (13) for excavation work. In the height position storage unit (35b), the height position of the bucket (13) for hauling work and the height position of the bucket (13) for loading work are stored in advance as offset values from the height position information about the bucket (13) for excavation work. In this way, the ride control device or the automatic transmission control device can be appropriately controlled regardless of the preference or habit of the operator.
    Type: Application
    Filed: November 25, 2016
    Publication date: March 16, 2017
    Inventors: Isamu AOKI, Koji HYODO, Tetsuji TANAKA, Keigo KIKUCHI
  • Publication number: 20160369479
    Abstract: A work vehicle, includes: a lift arm rotatably linked to a front portion of a vehicle body of a work vehicle so as to be allowed to swing along an up/down direction; an operation lever that can be operated within a range between a raising operation end position and a lowering operation end position, and is operated to raise and lower the lift arm; an up detent mechanism having a holding function for holding the operation lever at the raising operation end position once the operation lever is operated to the raising operation end position; and a down detent mechanism having a holding function for holding the operation lever at the lowering operation end position once the operation lever is operated to the lowering operation end position, wherein: when an angle of the lift arm becomes greater than a predetermined upper limit, the holding function of the up detent mechanism and the holding function of the down detent mechanism are disengaged.
    Type: Application
    Filed: May 13, 2015
    Publication date: December 22, 2016
    Inventors: Tetsuji TANAKA, Yasunori MIYAMOTO, Koji HYODO, Isamu AOKI, Katsuyuki KIRITA, Hiroaki YADA, Seiji NAKAGAWA, Masaki YOSHIKAWA
  • Patent number: 9523315
    Abstract: An engine control device for work vehicle includes: a target rotation speed setting unit that sets a target rotation speed of an engine corresponding to an operation amount of an accelerator pedal; a rotation speed control unit that controls a rotation speed of the engine according to the target rotation speed; a travel driving unit that transmits rotation of the engine to wheels via a torque converter; a speed ratio detection unit that detects a speed ratio between an input shaft and an output shaft of the torque converter; and a target rotation speed correction unit that corrects the target rotation speed set by the target rotation speed setting unit so as to increase the target rotation speed based on the speed ratio when the operation amount of the accelerator pedal is smaller than a predetermined value and the speed ratio detected by the speed ratio detection unit is smaller than a predetermined value within a range which is equal to or greater than 0 and less than 1.
    Type: Grant
    Filed: February 4, 2013
    Date of Patent: December 20, 2016
    Assignee: KCM Corporation
    Inventors: Koji Hyodo, Isamu Aoki, Tetsuji Tanaka, Keigo Kikuchi
  • Patent number: 9511759
    Abstract: A clutch control device for a work vehicle includes a determination unit that determines as to whether or not a clutch cutoff condition has been established based upon whether or not the accelerator pedal is being operated, as determined by the accelerator pedal operation determination unit, the vehicle speed of the work vehicle detected by the vehicle speed detection unit and the braking force of the work vehicle detected by the braking force detection unit; and a clutch control unit that controls engagement/release of a clutch so as to release the clutch when the determination unit determines that the clutch cutoff condition has been established.
    Type: Grant
    Filed: November 15, 2012
    Date of Patent: December 6, 2016
    Assignee: KCM Corporation
    Inventors: Koji Hyodo, Tetsuji Tanaka, Isamu Aoki, Keigo Kikuchi
  • Publication number: 20160326720
    Abstract: Provided is a wheel loader having an HST type driving system. In order to make it possible to improve working efficiency in an eco mode when a power mode and the eco mode have been set in the wheel loader, the wheel loader is provided with a controller 18 which has an eco mode characteristic line 31, a power mode characteristic line 32, and a lifting operation characteristic line 34 having a matching point C located between a matching point A between a working device operating engine torque characteristic line 30 and the eco mode characteristic line 31 and a matching point B between the working device operating engine torque characteristic line 30 and the power mode characteristic line 32. The controller 18 includes a control portion which controls an HST pump 11 in accordance with the lifting operation characteristic line 34 when lifting operation of a lift arm 4 is detected in the condition that the eco mode has been selected by a work mode selecting portion 22.
    Type: Application
    Filed: October 15, 2014
    Publication date: November 10, 2016
    Applicant: Hitachi Construction Machinery Co., Ltd.
    Inventors: Kohtaroh UNO, Shoroku KAWAHARA, Keigo KIKUCHI, Koji HYODO, Atsushi SHIMAZU
  • Patent number: 9458758
    Abstract: A cooling fan control unit, in response to an operation performed at the rotation direction selector switch to select a reverse rotation setting while the cooling fan is rotating forward, lowers a relief pressure setting at the variable relief valve to a predetermined lower limit value over a predetermined length of time, and once the discharge pressure at the hydraulic pump detected by the pressure sensor is lowered to a predetermined switch-over pressure, executes control so as to switch the direction of flow of pressure oil to the hydraulic motor to the reverse direction by switching the direction switching valve and raises the relief pressure setting at the variable relief valve to a reverse rotation pressure setting, at which the hydraulic motor rotates in the reverse direction, over a predetermined length of time.
    Type: Grant
    Filed: November 15, 2012
    Date of Patent: October 4, 2016
    Assignee: KCM Corporation
    Inventors: Koji Hyodo, Atsushi Shimazu, Isamu Aoki, Tetsuji Tanaka, Keigo Kikuchi
  • Patent number: 9458605
    Abstract: A work vehicle including a front work device, contains: a variable displacement hydraulic pump that is driven by an engine and supplies pressure oil to an actuator that drives the front work device; an exhaust gas purification device that purifies nitrogen oxide in exhaust gas discharged from the engine using a reducing agent solution stored in a reducing agent tank; a remaining amount detection device that detects a remaining amount of the reducing agent solution in the reducing agent tank; and a control unit that decreases output torque of the engine and also decreases a rotational speed of the engine in a rated point according to decrease of the remaining amount of the reducing agent solution detected by the remaining amount detection device.
    Type: Grant
    Filed: October 2, 2014
    Date of Patent: October 4, 2016
    Assignees: Hitachi Construction Machinery Co., Ltd., KABUSHIKI KAISHA KCM
    Inventors: Koji Hyodo, Takashi Takeyama, Tetsuji Tanaka, Isamu Aoki, Katsutaka Hara, Tatsuo Oouchi
  • Patent number: D854055
    Type: Grant
    Filed: May 23, 2016
    Date of Patent: July 16, 2019
    Assignee: KCM Corporation
    Inventors: Kazuhiko Hiraoka, Tomoyuki Miyata, Wataru Isaka, Satoshi Kan, Koji Hyodo, Masaki Yoshikawa, Isamu Aoki, Tetsuji Tanaka, Yasunori Miyamoto