Abstract: In a work machine, a control unit controls a pilot control valve for controlling the opening area of a first direction switch valve in executing the combined operation to be less than or equal to that in executing a single operation. The combined operation represents an operation of simultaneously operating first and second actuators. The single operation represents an operation of operating only the first actuator. Further, the control unit determines the opening area of the first direction switch valve in the combined operation based on a hydraulic pressure detected by a hydraulic pressure detector unit.

Abstract: A construction machine storing a first torque diagram representing a region of a torque and a speed of the engine being able to be driven in a maximum torque region with respect to the engine speed and a second torque diagram in the first torque diagram, and controlling to change the engine speed on the second torque diagram by shifting from the first torque diagram to the second torque diagram based on an operation amount of an operation lever and/or a load applied and decrease the engine speed based on a decrease in load on the second torque diagram, the construction machine comprising: a controller stopping the engine control when a specific mode is selected and controlling so that the engine speed becomes a value in accordance with a setting amount of a fuel adjusting unit regardless of a change in the lever operation amount and/or the load applied.

Abstract: In a work machine, a control unit controls a pilot control valve for controlling the opening area of a first direction switch valve in executing the combined operation to be less than or equal to that in executing a single operation. The combined operation represents an operation of simultaneously operating first and second actuators. The single operation represents an operation of operating only the first actuator. Further, the control unit determines the opening area of the first direction switch valve in the combined operation based on a hydraulic pressure detected by a hydraulic pressure detector unit.

Abstract: A data management device of a construction machine comprises a computing function for computing service meter time, a nonvolatile storage function for storing the computed data, and a transmission function for transmitting the data stored in the storage function to a monitor panel, while a monitor panel has a nonvolatile storage function for storing the data received from the data management device as backup data. With this configuration, a data management system for the construction machine which comprises the data management device and the monitor panel can reliably insure service meter time and other data even if a failure occurs to the data management device.

Abstract: A plurality of on-board controllers are provided within a construction machine. The plurality of on-board controllers are connected with freedom to communicate with each other by means of a serial communications line allowing communications in accordance with a predetermined communications protocol. Also, an information management controller which manages information about the inside of the construction machine is provided. Further, a monitoring station which mmanages information relating to at least one construction machine including the construction machine is provided on the outside of the construction machine. Also, the serial communications line inside the construction machine and the monitoring station are connected with freedom to communicate with each other via the information management controller. Data acquired by the plurality of on-board controllers is gathered, processed and stored by the information management controller, and the stored data is sent to the monitoring station.

Abstract: A controller unit is made so that a work machine can be remotely controlled in a reliable manner irrespectively of whether the controller unit is used outdoors or indoors. Inside the controller unit 10 is provided a transmitter 11 that inputs a control signal S0 indicating the control content, converts the input control signal S0 to a radio signal Se and radio-transmits it toward the work machine 13. The work machine 13 operates according to the radio signal Se radio-transmitted from the transmitter 11. Meanwhile, a transmitter 12 similar to the internal transmitter 11 is provided externally to the controller unit 10. Thereupon, when the external transmitter 12 is connected to the controller unit 10, it is determined by a determining unit 14 inside the controller unit 10 that the external transmitter 12 is connected to the controller unit 10.