Hitachi Construction Machinery Co., Ltd.

Junichi Narisawa

Hidefumi Ishimoto

Hiroshi Ogura

Hiroshi Watanabe

Takao Kurosawa

Morio Oshina

Kenichi Sagiya

Yoshinori Eguchi

Toshiyuki Miyamoto

Kenichi Miyata

Sumio Morita

Kenichiro Date

Kouichi Madarame

Yuhei Sato

Kenya Shyouji

An operation assist apparatus includes a display device installed in an operator's cab of a construction machine, at which at least operating procedures for the construction machine are displayed with text and illustrations; an image processing device that generates images; and a control device that engages the image processing device to generate an image of an operating procedure corresponding to an operation of the construction machine and engages the display device to display the image generated by the image processing device.

Operation assist apparatus

In an electronic control system for a construction machine, a governor control unit, an excavator body control unit, and an electric lever control unit are interconnected for transmission and reception of data. A universal communication line is connected to the governor control unit and is adapted for an interface in conformity with universal communication standards A dedicated communication line is connected to the excavator body control unit and the electric lever control unit and is adapted for an interface in conformity with dedicated communication standards different from the univeral communication standards. A communication relay control unit is used for, converting and transmitting communication data received from one of two systems of the communication lines to be in conformity with the communication standards of the other communication line.

Electronic control systems for construction machine

Control apparatus for electromagnetic device having proportional solenoid

In an industrial vehicle having at least first and second arms rotatably coupled to each other, a locus depicted by a tip of the second arm during rotation of the first and second arms is controlled. An amount of positional deviation of the tip of the second arm in the direction (compensating direction) perpendicular to the direction of the targeted locus (operating direction) is detected. A command value for the compensating velocity is determined from a command value for the operating velocity and the deviation. The driving of the first and second arms is controlled by the two velocity command values in the operating and compensating directions in such a manner that the tip of the second arm moves along the targeted locus. In short, positional feedback is provided by means of the positional deviation in the direction perpendicular to the targeted locus. In addition, the direction of the targeted locus is set as the direction of installation of an operating attachment mounted on the tip of the second arm. In an industrial vehicle further having a third arm, the second and third arms are driven in such a manner that the tip of the third arm will not deviate from the targeted locus as a result of the rotation of the first arm. At this juncture, the aforementioned feedback is also provided.

Apparatus for controlling arm movement of industrial vehicle

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Adachi-ku, Japan

Junichi Narisawa