Construction equipment

Abstract

A construction equipment includes a lower traveling body, an upper swing body on the lower traveling body, a work device comprising a boom, an arm, and a bucket moved by respective hydraulic cylinders and supported by the upper swing body, a control valve for controlling the hydraulic cylinder, an operation lever for outputting an operation signal, a work setting unit for setting and/or selecting the work area of the work device, a location information provision unit, and an electronic control unit (ECU). The ECU calculates the distance between the work area and the work device and controls the speed of the work device on the basis of the calculated distance. The ECU sets the speed limit range and/or speed reducing rate on the basis of the shortest distance between the bucket end and the work area in a reference bucket pin location.

1 . A construction equipment comprising:
 a lower traveling body;   an upper swing body rotatably supported on the lower traveling body;   a work device comprising a boom, an arm, and a bucket moved by means of respective hydraulic cylinders and supported by the upper swing body;   a control valve for controlling the hydraulic cylinder; an operation lever for outputting an operation signal corresponding to the operation amount of a driver;   a work setting unit capable of setting and/or selecting the work area of the work device;   a location information provision unit for collecting and/or calculating location information of the work device and/or location information of the work area; and   an electronic control unit for outputting a control signal for the control valve according to a signal inputted from at least one from among the control lever, the work setting unit, and the location information provision unit,   wherein the electronic control unit is configured to calculate the distance between the work area and the work device and to control the speed of the work device on the basis of the calculated distance,   wherein the electronic control unit sets the speed limit range and/or speed reducing rate on the basis of the shortest distance between the bucket end and the work area in a reference bucket pin location.   
     
     
         2 . The construction equipment of  claim 1 , wherein the electronic control unit determines whether the work device approaches or moves away from the work area when an operation signal of the operation lever is input, and limits the speed of the work device only when the work device approaches the work area. 
     
     
         3 . The construction equipment of  claim 1 , wherein the electronic control unit controls the speed of the work device on the basis of the speed reducing rate when the work device enters the speed limit range. 
     
     
         4 . The construction equipment of  claim 3 , wherein the electronic control unit reduces the speed limit amount of the work device in proportion to the raised distance of the bucket pin when the location of the bucket pin is raised to be higher than the location of the reference bucket pin. 
     
     
         5 . The construction equipment of  claim 1 , wherein the location information provision unit comprises at least one of a location measuring unit for measuring the location information of the construction equipment, a posture measuring unit for measuring the posture information of the construction equipment and the location of the respective work device, and a coordinate calculating unit for calculating the coordinate on the basis of the location information measured from the location measuring unit and the posture measuring unit. 
     
     
         6 . The construction equipment of  claim 1 , wherein the operation lever generates an electric signal in proportion to the operation amount of a driver and provides the same to the electronic control unit as an electric joystick. 
     
     
         7 . The construction equipment of  claim 1 , wherein the work setting unit provides a plurality of work mode setting functions that can be set according to the driver's need, and displays, on a display screen, at least one of the geographic information, location information and posture information of the construction equipment provided from the location information provision unit according to the work mode setting.