JP2003189376A5

JP2003189376A5 -

Info

Publication number: JP2003189376A5
Application number: JP2001389320A
Authority: JP
Filing date: 2001-12-21
Publication date: 2005-07-28
Anticipated expiration: 2021-12-21

Claims

  In a remote control system for a construction machine that receives a command signal transmitted from a transmitter by a receiver mounted on the construction machine, operates an actuator of the construction machine, and remotely operates the construction machine,
  The transmitter is
  An operation indicator for instructing an operation command by an operator;
  A selection device operated by an operator to select at least one of the first and second communication speeds (> first communication speed);
  Based on the operation command, when the first communication speed is selected, the command signal of the first communication speed is transmitted wirelessly, and when the second communication speed is selected, the A transmission circuit that wirelessly transmits a command signal of the second communication speed,
  The receiver
  A command of the selected communication speed is demodulated by demodulating one of the first communication speed and the second communication speed emitted from the transmitter according to the communication speed selected by the selection device. A demodulator that outputs a signal;
  A drive signal generation circuit configured to generate an actuator drive signal based on one of the command signal based on the first communication speed and the command signal based on the second communication speed output from the demodulator. A remote control system for construction machinery.

  In the remote control system of the construction machine according to claim 1,
  The radio wave radiated from the transmission circuit is radiated by a carrier wave of 429 MHz band,
  The first communication speed command signal is generated by MSK modulation with a communication speed of 2400 bps,
  The construction signal remote control system, wherein the second communication speed command signal is generated by FSK modulation with a communication speed of 4800 bps.

(A) a hydraulic excavator including a hydraulic operation lever device, a main valve that is driven by an operation signal of the hydraulic operation lever device to control hydraulic pressure, and a hydraulic actuator that is driven by hydraulic pressure controlled by the main valve;
(B) an operation indicator that instructs an operation command by an operator, a selection device that is operated by the operator and selects at least one of the first and second communication speeds (> first communication speed);
Based on the operation command, when the first communication speed is selected, a command signal for the first communication speed is transmitted wirelessly, and when the second communication speed is selected, the first communication speed is transmitted. A transmission circuit that wirelessly transmits a command signal of a communication speed of two, and several hundreds m A transmitter arranged at a work site several kilometers away or a work site several meters to several tens of meters away;
(C) The communication selected by demodulating one of the first communication speed and the second communication speed emitted from the transmitter according to the communication speed selected by the selection device. A demodulator that outputs a speed command signal, and generates an actuator drive signal based on one of the command signal based on the first communication speed and the command signal based on the second communication speed output from the demodulator A receiver mounted on the hydraulic excavator,
(D) A hydraulic excavator remote control system comprising a proportional solenoid valve mounted on the hydraulic excavator and converting the actuator drive signal into a hydraulic signal for driving the main valve.

The remote control system for a hydraulic excavator according to claim 3,
A shuttle valve that selects and supplies either the hydraulic signal output from the proportional solenoid valve or the hydraulic signal based on the operation of the hydraulic control lever device to the main valve. A remote operation system for a hydraulic excavator characterized by the above.

In the remote control system of the hydraulic excavator according to claim 3 or 4,
The hydraulic excavator is further equipped with a controller that, when the actuator drive signal is inputted, converts the signal into a signal for driving the proportional solenoid valve and outputs the signal to the proportional solenoid valve. Operation system.