Patents by Inventor Mitsuhiko Kamado
Mitsuhiko Kamado 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).
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Publication number: 20230160181Abstract: A display system includes a display and a controller. The controller causes the display to display a third figure representing a relative relationship between a first figure indicating a direction of a working implement of a working machine and a second figure indicating a direction of a target topography from the working machine.Type: ApplicationFiled: March 17, 2021Publication date: May 25, 2023Applicant: KOMATSU LTD.Inventors: Mitsuhiko KAMADO, Akihiro KAGEYAMA, Hayato HISA, Toru OBARA
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Publication number: 20230138735Abstract: A display system includes a display and a controller. The controller displays a third figure indicating a relative relationship between a first figure indicating an inclination of a bottom surface of a bucket and a second figure indicating an inclination of a target topography on the display.Type: ApplicationFiled: March 17, 2021Publication date: May 4, 2023Applicant: KOMATSU LTD.Inventors: Mitsuhiko KAMADO, Akihiro KAGEYAMA, Hayato HISA, Toru OBARA
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Publication number: 20220389687Abstract: A first process acquires a true value of the position of a predetermined portion. A second process acquires a reference position of a work machine. A third process determines a plurality of correction candidate values of a parameter. The correction candidate values are used so that a calculation value of the position of the predetermined portion calculated based on the parameter from the reference position matches the true value. A fourth process calculates an assessment value indicative of the difference between the true value and a calculation value for each of plurality of correction candidate values. A fifth process determines a confirmation correction value of the parameter from among the plurality of correction candidate values based on the assessment value.Type: ApplicationFiled: February 17, 2021Publication date: December 8, 2022Inventors: Mitsuhiko KAMADO, Takashi SAWAKI
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Publication number: 20170058490Abstract: A working vehicle is provided with a hydraulic pump is driven using an engine. A hydraulic actuator is driven using hydraulic fluid which is discharged from the hydraulic pump. A power generator motor driven using the engine. An electric actuator is driven using electrical power which is generated using the power generator motor. An exhaust processing apparatus cleans exhaust from the engine. A reducing agent tank retains reducing agent which is supplied to the exhaust processing apparatus. A retention amount detecting section detects the retention amount of the reducing agent inside the reducing agent tank. An engine control section performs output restriction control where the output of the engine is reduced when the retention amount is equal to or less than a first threshold. The electric actuator control section restricts the output of the electric actuator during executing of the output restriction control.Type: ApplicationFiled: September 1, 2015Publication date: March 2, 2017Applicant: KOMATSU LTD.Inventors: Mitsuhiko KAMADO, Shinya ARIMATSU, Tomotaka IMAI
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Patent number: 9540785Abstract: A working vehicle includes a revolving pump output calculating section that calculates the revolving pump output where the output of an electric motor is converted to be the output of a hydraulic pump. A reduction amount determining section determines a reduction amount for the output of the hydraulic pump during the multiple operations based on the revolving pump output. A pump output determining section determines a value, where the reduction amount is subtracted from the output of the hydraulic pump which is determined according to the state with the multiple operations, in a first control mode as the output of the hydraulic pump during the multiple operations. The pump output determining section increases the output of the hydraulic pump during the multiple operations in a second control mode more than in the first control mode.Type: GrantFiled: August 18, 2015Date of Patent: January 10, 2017Assignee: KOMATSU LTD.Inventors: Mitsuhiko Kamado, Takashi Sugiguchi, Shinya Arimatsu, Yuki Sugimura
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Patent number: 9528247Abstract: A control system for a work vehicle includes a temperature detecting unit and a controller. The temperature detecting unit detects the temperature of the electrical drive system. The controller controls the output of an electric motor when the temperature of the electrical drive system detected by the temperature detecting unit exceeds a predetermined first threshold and an operating member of the movable body is positioned in a neutral position. The controller does not limit the output of the electric motor when the operating member for the movable body is being operated even when the temperature of the electrical drive system exceeds the first threshold.Type: GrantFiled: November 2, 2015Date of Patent: December 27, 2016Assignee: KOMATSU LTD.Inventor: Mitsuhiko Kamado
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Publication number: 20160339898Abstract: A work vehicle includes a plurality of hybrid instruments, a cooling medium circuit, a radiator, a fan, a variable mechanism, a plurality of sensors, and a fan control unit. The cooling medium circuit communicates with the plurality of hybrid instruments to cause a cooling medium for cooling the plurality of hybrid instruments to circulate through the hybrid instruments. The radiator is connected to the cooling medium circuit. The fan generates cooling wind for cooling the radiator. The variable mechanism is capable of changing the number of rotations of the fan. The plurality of sensors are provided in correspondence with the plurality of hybrid instruments, respectively, each detecting the temperature of a corresponding one of the hybrid instruments. The fan control unit controls the variable mechanism based on the temperatures detected by the plurality of sensors, to control the number of rotations of the fan.Type: ApplicationFiled: December 4, 2014Publication date: November 24, 2016Inventors: Mitsuhiko KAMADO, Kouichi MIYATAKE, Junpei UEDA
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Patent number: 8612102Abstract: In a hydraulic excavator, a controller is configured to control output of an engine based on a first engine output torque line that defines an upper limit for engine output torque against engine rotation rate. The controller is configured to determine which of two operations, a high hydraulic load operation in which a work machine is subjected to a high hydraulic load and a low hydraulic load operation in which the work machine is subjected to a low hydraulic load, is being performed. When swinging for a revolving unit and the low hydraulic load operation for the work machine are being performed as a combined operation, the controller is configured to control the output of the engine based on a second engine output torque line. The second engine output torque line is an engine output torque line with a lower engine output torque than the first engine output torque line.Type: GrantFiled: May 17, 2011Date of Patent: December 17, 2013Assignee: Komatsu Ltd.Inventors: Kouji Ohhigashi, Mitsuhiko Kamado, Takao Suehiro
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Patent number: 8463512Abstract: A bulldozer of the present invention includes a GPS receiver which is fixed to a vehicle body of the bulldozer, and angle obtaining part which stores a conversion table in which a combination of an angling cylinder length and a tilt cylinder length are matched with a combination of a blade angling angle and a blade tilting angle.Type: GrantFiled: September 30, 2011Date of Patent: June 11, 2013Assignee: Komatsu Ltd.Inventors: Kazuhiko Hayashi, Mitsuhiko Kamado, Tomohiro Nakagawa
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Publication number: 20130081836Abstract: A bulldozer of the present invention includes a GPS receiver which is fixed to a vehicle body of the bulldozer, and angle obtaining part which stores a conversion table in which a combination of an angling cylinder length and a tilt cylinder length are matched with a combination of a blade angling angle and a blade tilting angle.Type: ApplicationFiled: September 30, 2011Publication date: April 4, 2013Applicant: KOMATSU LTD.Inventors: Kazuhiko HAYASHI, Mitsuhiko Kamado, Tomohiro Nakagawa
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Patent number: 8321114Abstract: A control unit is configured to calculate a target absorption torque of a hydraulic pump at which the engine output torque and the absorption torque of the hydraulic pump match a target matching rotation speed of the engine. The control unit is configured to refer to command data, calculate a command current value corresponding to the target absorption torque, and output a command signal of the calculated value to a pump control device. The control unit is configured to calculate the absorption torque at calibration points at which there is an equilibrium state in which the output horsepower of the engine and the absorption horsepower of the hydraulic pump are matched. The control unit is configured to acquire calibration information including the calculated absorption torque and the command current value output to the pump control device in the equilibrium state, and calibrate the command data based on the calibration information.Type: GrantFiled: May 20, 2011Date of Patent: November 27, 2012Assignee: Komatsu Ltd.Inventors: Mitsuhiko Kamado, Kouji Ohhigashi, Kouichi Miyatake, Akinori Sugiura
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Publication number: 20120185141Abstract: A control unit is configured to calculate a target absorption torque of a hydraulic pump at which the engine output torque and the absorption torque of the hydraulic pump match a target matching rotation speed of the engine. The control unit is configured to refer to command data, calculate a command current value corresponding to the target absorption torque, and output a command signal of the calculated value to a pump control device. The control unit is configured to calculate the absorption torque at calibration points at which there is an equilibrium state in which the output horsepower of the engine and the absorption horsepower of the hydraulic pump are matched. The control unit is configured to acquire calibration information including the calculated absorption torque and the command current value output to the pump control device in the equilibrium state, and calibrate the command data based on the calibration information.Type: ApplicationFiled: May 20, 2011Publication date: July 19, 2012Applicant: KOMATSU LTD.Inventors: Mitsuhiko Kamado, Kouji Ohhigashi, Kouichi Miyatake, Akinori Suguira
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Publication number: 20120177470Abstract: In a hydraulic excavator, a controller is configured to control output of an engine based on a first engine output torque line that defines an upper limit for engine output torque against engine rotation rate. The controller is configured to determine which of two operations, a high hydraulic load operation in which a work machine is subjected to a high hydraulic load and a low hydraulic load operation in which the work machine is subjected to a low hydraulic load, is being performed. When swinging for a revolving unit and the low hydraulic load operation for the work machine are being performed as a combined operation, the controller is configured to control the output of the engine based on a second engine output torque line. The second engine output torque line is an engine output torque line with a lower engine output torque than the first engine output torque line.Type: ApplicationFiled: May 17, 2011Publication date: July 12, 2012Applicant: KOMATSU LTD.Inventors: Kouji Ohhigashi, Mitsuhiko Kamado, Takao Suehiro
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Patent number: 7946404Abstract: A device for a work vehicle eliminates uncomfortable operation feeling, improves the working efficiency, and reduces thermal load on a clutch and transmission shock. It is determined whether the current travel direction of the vehicle body is a forward travel direction F or a reverse travel direction R based clutch oil pressure of the forward clutch or reverse clutch. Braking force of a brake device is controlled such that the brake device is activated on the conditions that the travel direction position selected by the travel operation lever and the travel direction determined by a travel direction flag are opposite to each other, and the detected vehicle body speed is equal to or greater than a predetermined threshold value.Type: GrantFiled: November 30, 2006Date of Patent: May 24, 2011Assignee: Komatsu Ltd.Inventors: Tomohiro Nakagawa, Shigeru Yamamoto, Mitsuhiko Kamado
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Patent number: 7856951Abstract: An invention relating to a control apparatus and a control method for a hydraulically driven cooling fan for reducing the peak pressure produced upon reversing the switch position of a switching valve, without stopping an engine, and without greatly modifying existing hydraulic circuitry or increasing the apparatus cost. In the invention, in the case that a reversing switch has been operated so as to output a reversal processing commencement instruction signal, control is carried out such that, under the condition that the rotational speed of the engine has decreased to not more than a stipulated rotational speed, capacity adjusting means is controlled, so as to reduce the capacity of a hydraulic pump, and thus reduce the fan rotational speed, and then the switch position of the switching valve is reversed.Type: GrantFiled: July 6, 2006Date of Patent: December 28, 2010Assignee: Komatsu, Ltd.Inventors: Mitsuhiko Kamado, Shigeru Yamamoto, Tomohiro Nakagawa
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Publication number: 20090120386Abstract: An invention relating to a control apparatus and a control method for a hydraulically driven cooling fan for reducing the peak pressure produced upon reversing the switch position of a switching valve, without stopping an engine, and without greatly modifying existing hydraulic circuitry or increasing the apparatus cost. In the invention, in the case that a reversing switch has been operated so as to output a reversal processing commencement instruction signal, control is carried out such that, under the condition that the rotational speed of the engine has decreased to not more than a stipulated rotational speed, capacity adjusting means is controlled, so as to reduce the capacity of a hydraulic pump, and thus reduce the fan rotational speed, and then the switch position of the switching valve is reversed.Type: ApplicationFiled: July 6, 2006Publication date: May 14, 2009Applicant: Komatsu, Ltd.Inventors: Mitsuhiko Kamado, Shigeru Yamamoto, Tomohiro Nakagawa
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Publication number: 20090013810Abstract: A device is provided which eliminates uncomfortable operation feeling, improves the working efficiency, and reduces thermal load on a clutch and transmission shock. It is determined whether the current travel direction of the vehicle body is a forward travel direction F or a reverse travel direction R based on an operation position selected by a travel operation lever, clutch oil pressure of the forward clutch or reverse clutch, and a detected vehicle body speed. Braking force of a brake device is controlled such that the brake device is activated on the conditions that the travel direction position selected by the travel operation lever and the travel direction determined by a travel direction flag are opposite to each other, and the detected vehicle body speed is equal to or greater than a predetermined threshold value.Type: ApplicationFiled: November 30, 2006Publication date: January 15, 2009Inventors: Tomohiro Nakagawa, Shigeru Yamamoto, Mitsuhiko Kamado
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Patent number: 7373239Abstract: An engine control apparatus for a work vehicle having a cooling fan or an auxiliary device driven by an engine. The engine control apparatus is capable of operating the work vehicle with the importance placed either on amount of work or fuel economy depending on the situation, and preventing the input of excessive traveling horsepower (or working horsepower), regardless of a selected work mode, to ensure durability of the traveling power train (or work machine drive equipment). Upon selection of a work mode by the work mode selection switch, a controller controls the engine to obtain a power curve selected from those selectable for the selected work mode can be obtained, based on the coolant temperature range and the selected work mode, so that the input torque transmitted to the traveling power train does not surpass the upper limit for the input torque (rated output).Type: GrantFiled: July 5, 2006Date of Patent: May 13, 2008Assignee: Komatsu, Ltd.Inventors: Mitsuhiko Kamado, Shigeru Yamamoto
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Publication number: 20070016355Abstract: An engine control apparatus for a work vehicle having a cooling fan or an auxiliary device driven by an engine. The engine control apparatus is capable of operating the work vehicle with the importance placed either on amount of work or fuel economy depending on the situation, and preventing the input of excessive traveling horsepower (or working horsepower), regardless of a selected work mode, to ensure durability of the traveling power train (or work machine drive equipment). Upon selection of a work mode by the work mode selection switch, a controller controls the engine to obtain a power curve selected from those selectable for the selected work mode can be obtained, based on the coolant temperature range and the selected work mode, so that the input torque transmitted to the traveling power train does not surpass the upper limit for the input torque (rated output).Type: ApplicationFiled: July 5, 2006Publication date: January 18, 2007Inventors: Mitsuhiko Kamado, Shigeru Yamamoto
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Patent number: 6959671Abstract: A cooling system for use in a work machine is provided, in which an increase in the load imposed on a fan driving circuit and occurrence of abnormal noise can be prevented without fail by means of an inexpensive arrangement at the time of switching the rotating direction of a cooling fan. To this end, the cooling system comprises: (1) a variable displacement hydraulic pump driven by the engine; (2) a forwardly and reversely rotatable hydraulic motor operated by hydraulic oil supplied from the hydraulic pump; (3) a cooling fan driven by the hydraulic motor; (4) an electromagnetic selector valve for switching the rotating direction of the hydraulic motor between a forward direction and a reverse direction; (5) controlling means for controlling switching of the electromagnetic selector valve and controlling the hydraulic pump so as to minimize the discharge oil rate of the hydraulic pump during switching of the electromagnetic selector valve.Type: GrantFiled: February 23, 2004Date of Patent: November 1, 2005Assignee: Komatsu Ltd.Inventors: Tomohiro Nakagawa, Shigeru Yamamoto, Mitsuhiko Kamado