Komatsu Corporation

Toshihiko Fukasawa

Eiji Ishibashi

Shigeru Yamamoto

Yutaka Sugimoto

Hisao Asada

Hidehiro Hashimoto

Tomohiro Nakagawa

Kazuhiko Hayashi

Kazushi Nakata

Yoshitaka Onodera

Yasuo Fujiwara

Shinobu Kamikawa

Yoshiyuki Hirosawa

Ikuzo Mochida

Masato Oura

In a working vehicle, a control unit is configured to control an engine based on an engine power curve indicating a relationship between an engine speed and an engine output torque. The control unit is further configured to calculate an absorption horsepower that is an absorption horsepower of a hydraulic pump and to change the engine power curve used to control the engine based on the absorption horsepower.

Working vehicle

A traveling control device and a traveling control program for a work vehicle in which a change in a control quantity due to an effect of vehicle body vibrations is small, fixing the desired control quantity is possible, and the control quantity can be matched with the operator's feel. A travel control program in which a first line on which the speed ratio reduces corresponding to a change in the operation stroke, a second line having hysteresis with respect to the first line and on which the speed ratio increases corresponding to a change in the operation stroke, and third lines on which the speed ratio changes corresponding to the change in the operation stroke and the change in speed ratio with respect to the change in the operation stroke is smaller than that of the first and the second line are set is installed in the control device.

Traveling control device and traveling control program for work vehicle or control device and control program for work vehicle

A vehicle mounted with a continuous stepless transmission having a continuous stepless transmission and a controlling section for performing speed-changing operation of the continuous stepless transmission, the speed change ratio of the continuous stepless transmission being switchable by a speed change operation section, includes: a shift-mode-switching section which switches the mode of a speed change ratio switching, the speed change ratio switching being performed by the speed change operation section, between a first mode for switching the speed change ratio in stages among a plurality of preset speed change ratios and a second mode for switching the speed change ratio continuously or substantially continuously; in which the controlling section further includes a vehicle speed setting section which sets a target vehicle speed at least based on the speed change operation signal detected by operating the speed change operation section and a mode signal detected by switching the shift-mode-switching section.

Vehicle mounted with continuous stepless transmission

A hydrostatic transmission vehicle comprises: a fuel adjustment position detection portion () which detects an operation position of a fuel adjustment portion (); a deceleration operation position detection portion () which detects an operation quantity of a deceleration operation portion (); and a controller () which controls a displacement of a hydrostatic transmission (), and the controller () comprises: an operation state judgment portion () which judges operation states of the fuel adjustment portion () and the deceleration operation portion () based on detection values acquired by the fuel adjustment position detection portion () and the deceleration operation position detection portion (); and a displacement control command generation portion () which generates a displacement control command which differs depending on a case where an engine revolution number is restricted by the fuel adjustment portion () and a case where an engine revolution number is restricted by the deceleration operation portion ().

Hydrostatic transmission vehicle and hydrostatic transmission controller

A method and system for controlling a hydraulic driving circuit, which are simple in structure, capable of readily providing neutral position adjustment, manually adjustable and able to cope with a failure in the circuit. When an adjustment mode for adjusting the neutral position of a steering hydraulic pump is set, an offset command current value is calculated as a command current value to be output to a servo electromagnetic valve, and an offset command value calculated when a steering lever is in its neutral position is output to the servo electromagnetic valve to adjust the neutral position of the steering hydraulic pump.

Method and system for controlling hydraulic driving circuit

An independent two pump system comprising an implement hydraulic pump and a steering hydraulic pump is described. The system has an inexpensive structure and the capability of preventing a construction machine from engine stalling without impairing fuel economy. When the implement hydraulic pump is actuated with the output of an engine to operate an implement attached to the construction machine, while actuating the steering hydraulic pump with the output of the engine to turn a vehicle body of the machine, the load exerted on the implement is detected and if the detected load is determined to exceed a preset value, the displacement of the steering hydraulic pump is reduced to thereby reduce the load associated with turning of the vehicle body.

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Komatsu, Japan

Toshihiko Fukasawa