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Automatic control system and method for joystick control-based construction equipment

  • US 9,739,036 B2
  • Filed: 11/20/2013
  • Issued: 08/22/2017
  • Est. Priority Date: 12/13/2012
  • Status: Active Grant
First Claim
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1. A system for automatically controlling construction equipment, to which a joystick is applied, based on a joystick control, comprising:

  • a hydraulic pump configured to discharge working fluid within a hydraulic tank and supply the working fluid to an actuator;

    the actuator configured to drive a construction work apparatus with the working fluid of the hydraulic pump;

    first electronic hydraulic control valves installed in a piston-side inlet flow path and a rod-side inlet flow path connected from the hydraulic pump to the actuator;

    second electronic hydraulic control valves installed in a piston-side outlet flow path and a rod-side outlet flow path connected from the actuator to the hydraulic tank; and

    a control unit configured to independently control the first electronic hydraulic control valves and the second electronic hydraulic control valves connected to the actuator,wherein the system is implemented as a close center system without a bypass flow path connected from the hydraulic pump to the hydraulic tank by bypassing the actuator,the control unit determines a speed of the actuator in proportion to a stroke by an operation of the joystick and controls the first electronic hydraulic control valves, the second electronic hydraulic control values and the hydraulic pump by using the speed of the actuator regardless of an external load condition, andthe control unit controls the hydraulic pump so as not to discharge a predetermined flow rate when the joystick is in a neutral stage.

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