Abstract:
The present disclosure relates to a method capable of reducing a communication cost for tracking a location of construction equipment by controlling a transmission cycle of locational information of the construction equipment. 
     To this end, the present disclosure provides a method for tracking a location of construction equipment by using a tracking vehicle, including: transmitting locational information from the construction equipment at a predetermined transmission cycle; calculating a distance between the construction equipment and the tracking vehicle based on the locational information received from the construction equipment; and if the calculated distance is less than a predetermined value, commanding that a transmission cycle of the locational information of the construction equipment be made shorter than a predetermined transmission cycle.

Description:
This Application is a Section 371 National Stage Application of International Application No. PCT/KR2010/006859, filed Oct. 7, 2010 and published, not in English, as WO2011/046321 on Apr. 21, 2011. 
     FIELD OF THE DISCLOSURE 
     The present disclosure relates to a system and a method for tracking a position of construction equipment, and more particularly, to a system and a method for tracking a location of construction equipment that can reduce a communication cost for tracking a location by controlling a transmission cycle of locational information of construction equipment. 
     BACKGROUND OF THE DISCLOSURE 
     In general, in a remote management system of construction equipment, construction equipment such as an excavator, a wheel loader, or the like transmits, to a management server for managing construction equipment using a mobile communication network or a satellite communication network, information including engine rpm (radius per minute), battery voltage, the temperature of cooling water, the temperature of oil, on/off sensing information of various switches, on/off sensing information of solenoids or relays, error code, an operation time for each operation mode, an engine operation time, a filter/oil using time, the pressures of a pump and a cylinder, fuel information, load rate information, locational information, and the like of the equipment. 
     Further, when an event for tracking a location of construction equipment (for example, the occurrence of a theft situation and the like) occurs, the construction equipment is configured to transmit locational information of construction equipment to the management server at a shorter cycle than a predetermined cycle. 
     However, a method of shortening a transmission cycle of locational information from the point of time of starting to track a location of construction equipment has a disadvantage in that a data transmission amount is increased, leading to an increase in communication costs. 
     Therefore, it is required to develop a technology capable of reducing a communication cost for tracking a location of construction equipment and of more rapidly and easily tracking stolen equipment by exactly determining a location of moving construction equipment. 
     The discussion above is merely provided for general background information and is not intended to be used as an aid in determining the scope of the claimed subject matter. 
     SUMMARY 
     This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. 
     Accordingly, the present disclosure provides a method for tracking construction equipment that can reduce a communication cost incurred as a transmission cycle of locational information becomes shorter when tracking construction equipment and more rapidly and easily track the construction equipment by exactly determining a location of stolen equipment which is on the move. 
     In order to achieve the above object, the present disclosure provides a method for tracking a location of construction equipment by using a tracking vehicle, including: (a) transmitting locational information from the construction equipment at a predetermined transmission cycle; (b) calculating a distance between the construction equipment and the tracking vehicle based on the locational information received from the construction equipment; and (c) comparing the distance acquired by the calculation with a predetermined value and if the distance is less than the predetermined value, commanding that a transmission cycle of the locational information of the construction equipment be made shorter than the predetermined transmission cycle. 
     According to an exemplary embodiment of the present disclosure, in process (b), the received locational information of the previous transmission cycle is stored and compared with current locational information which is received in real time, and as a result of the comparison, if the location of the construction equipment is changed, in process (c), it is commanded that the transmission cycle be made shorter than the predetermined transmission cycle. 
     According to an exemplary embodiment of the present disclosure, in process (c), if the distance acquired by calculating the distance between the construction equipment and the tracking vehicle is less than the predetermined value, it is commanded that a transmission cycle of locational information of a construction equipment-side communication terminal be changed in proportion to the calculated distance. 
     Further, the present disclosure provides a system for tracking a location of construction equipment including construction equipment to be tracked, a tracking vehicle tracking the construction equipment, and a management server communicating with the construction equipment and the tracking vehicle to provide information such that the tracking vehicle tracks a location of the construction equipment, the system including: a GPS unit installed in the construction equipment to provide locational information of the construction equipment; a construction equipment-side communication modem unit installed in the construction equipment to transmit and receive locational information of the construction equipment to and from the outside at a predetermined transmission cycle; a tracking vehicle-side GPS unit installed in the tracking vehicle to provide locational information of the tracking vehicle; a tracking vehicle-side communication modem unit installed in the tracking vehicle to transmit and receive locational information of the tracking vehicle to and from the outside at a predetermined transmission cycle; a management server-side communication unit installed in the management server to transmit and receive information to and from the construction equipment-side communication modem unit and the tracking vehicle-side communication modem unit at a predetermined transmission cycle, respectively; and a control unit installed in the management server to calculate a distance between the construction equipment and the tracking vehicle based on the locational information of the construction equipment and the tracking vehicle received through the management server-side communication unit, and commanding the construction equipment-side communication modem that the transmission cycle of the location of the construction equipment be made shorter than a predetermined transmission cycle, if the calculated distance value is smaller than a predetermined distance value. 
     According to an exemplary embodiment of the present disclosure, the control unit stores the locational information of the construction equipment received from the construction equipment-side modem unit, and compares the locational information with current locational information of the construction equipment that is received in real time, and if the locational information of the construction equipment is changed, the control unit commands that the transmission cycle of the locational information of the construction equipment be made shorter than the predetermined transmission cycle. 
     According to an exemplary embodiment of the present disclosure, if the distance acquired by calculating the distance between the construction equipment and the tracking vehicle is less than the predetermined value, the control unit commands that a transmission cycle of locational information of a construction equipment-side communication terminal be changed in proportion to the calculated distance. 
     According to the present disclosure, instead of shortening a transmission cycle of locational information of construction equipment immediately from the point of time of tracking a location of the construction equipment, when the distance between the construction equipment and the tracking vehicle is less than the predetermined value D, the transmission cycle of the locational information of the construction equipment is changed to be shorter than an existing transmission cycle, and as result of determining whether the construction equipment is moved, when the construction equipment is moved, the transmission cycle of the locational information of the construction equipment is changed to be shorter than the existing transmission cycle. 
     Therefore, the present disclosure provides an effect of reducing a communication cost as compared to a method in the related art of unconditionally shortening a transmission cycle when tracking a location of construction equipment, and it is possible to more rapidly and easily track the location by exactly determining the location of the moving construction equipment. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a configuration diagram of a system for tracking a location of construction equipment according to an exemplary embodiment of the present disclosure. 
         FIG. 2  is a signal flow chart showing a process of tracking a location of construction equipment according to a first exemplary embodiment of the present disclosure. 
         FIG. 3  is a signal flow chart showing a process of tracking a location of construction equipment according to a second exemplary embodiment of the present disclosure. 
       
         
           
                 
                 
               
             
                 
                     
                 
               
               
                 
                   100: Construction equipment 
                   102: Control unit 
                 
                 
                   104: GPS unit 
                   106: Communication modem unit 
                 
                 
                   110: Management server 
                   112: Control unit 
                 
                 
                   114: Communication unit 
                   120: Tracking vehicle 
                 
                 
                   122: Control unit 
                   124: Communication modem unit 
                 
                 
                   126: GPS unit 
                   130: Network 
                 
                 
                     
                 
               
            
           
         
       
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that the same components refer to the same reference numerals anywhere as possible in the drawings. In the following description, specific detailed matters will be described and are provided for the more overall understanding of the present disclosure. Further, in describing the present disclosure, when it is determined that detailed description relating to well-known functions or configurations may make the subject matter of the present disclosure unnecessarily ambiguous, the detailed description will be omitted. 
     First, a configuration of a system for tracking a location of construction equipment according to an exemplary embodiment of the present disclosure will be described with reference to  FIG. 1 . 
     Referring to  FIG. 1 , the system for tracking a location of construction equipment includes construction equipment  100 , a management server  110  for remotely managing information of construction equipment, and a tracking vehicle  120 . At this time, the construction equipment  100  communicates with the management server  110  or the tracking vehicle  120  through a network (a mobile communication network or a satellite communication network). 
     First, the construction equipment  100  includes a control unit  102 , a GPS unit  104 , and a communication modem unit  106 . 
     The GPS unit  104  receives signals transmitted from a plurality of GPS satellites to determine a location of construction equipment. In other words, the locational information of the construction equipment  100  may be calculated through the GPS unit  104 . 
     The communication modem unit  106  may include a satellite communication modem for transmitting and receiving data through a satellite communication network or a mobile communication modem for transmitting and receiving data through a mobile communication network. The communication modem unit  106  transmits and receives locational information of the construction equipment to and from the outside (tracking vehicle  120  or management server  110 ) at a predetermined transmission cycle. 
     The control unit  101  transmits the locational information of the construction equipment  100  calculated by the GPS unit  104  to the tracking vehicle  120  or the management server  110  through the communication modem unit  106  at the predetermined transmission cycle. 
     The management server  110  includes a communication unit  114  and a control unit  112 . 
     The communication unit  114  transmits and receives information to and from the construction equipment-side communication modem unit  106  and a tracking vehicle-side communication modem unit  120  through the network  130  at the predetermined transmission cycle. 
     The control unit  112  calculates a distance between the construction equipment and the tracking vehicle based on the locational information of the construction equipment  100  and the tracking vehicle  120  that is provided through the communication unit  114 . Thereafter, when the calculated distance value is smaller than a predetermined distance value, the control unit  112  commands that the construction equipment-side communication modem  106  make a transmission cycle of the location of the construction equipment shorter than the predetermined transmission cycle. 
     Further, the control unit  112  stores the locational information of the construction equipment  100  received from the construction equipment-side communication modem unit  106 , and compares the locational information with current locational information of the construction equipment  100  that is received in real time. Thereafter, when the locational information of the construction equipment  100  is changed, the control unit  112  commands that the transmission cycle of the locational information of the construction equipment  100  be made shorter than the predetermined transmission cycle. At this time, the command is transmitted to the communication modem unit  106  of the construction equipment  100  through the communication unit  114 . 
     Lastly, the tracking vehicle  120  includes a control unit  122 , a communication modem unit  124 , a GPS unit  126 , and a display unit  128 . 
     The communication modem unit  124  may include a satellite communication modem for transmitting and receiving data through a satellite communication network or a mobile communication modem for transmitting and receiving data through a mobile communication network. The communication modem unit  124  transmits and receives locational information of the tracking vehicle  120  to and from the outside (construction equipment  100  and management server  110 ) at a predetermined transmission cycle. 
     The GPS unit  126  receives signals transmitted from a plurality of GPS satellites to determine a location of the tracking vehicle  120 . In other words, the locational information of the tracking vehicle  120  may be calculated by the GPS unit  126 . 
     The display unit  128  may be constituted by a liquid crystal display (LCD) and the like and may display the locational information of the construction equipment  100  or display both the locational information of the construction equipment and the locational information of the tracking vehicle  120 . Further, when displaying the information, only a direction and a distance may be displayed and locational information may also be displayed on an electronic map. 
     The control unit  122  calculates a distance between the tracking vehicle  120  and the construction equipment  100  based on the locational information that is received from the construction equipment-side communication modem unit  106  and the locational information that is provided from the tracking vehicle-side GPS unit  126 . Thereafter, when the calculated distance value is smaller than a predetermined distance value, the control unit  122  commands that the construction equipment-side communication modem unit  106  make the transmission cycle of the location of the construction equipment  100  shorter than the predetermined transmission cycle. At this time, the command may be transmitted to the construction equipment-side communication modem unit  106  through the communication modem unit  124 . 
     Further, the control unit  122  stores the locational information of the construction equipment  100  received from the construction equipment-side communication modem unit  106 , and compares the locational information with current locational information of the construction equipment  100  that is received in real time. As a result of the comparison, if the locational information of the construction equipment  100  is changed, the control unit  122  commands that the transmission cycle of the locational information of the construction equipment  100  be made shorter than the predetermined transmission cycle. 
     Meanwhile, when the construction equipment  100  is stolen, only location-related information is transmitted to the management server  100  or the tracking vehicle  120  and the rest of information (maintenance-related information) is not transmitted, thereby reducing a communication cost. 
     With respect to the exemplary embodiments of the present disclosure, a first exemplary embodiment in which a location of construction equipment is tracked by the tracking vehicle  120  and a second exemplary embodiment in which the location is tracked by the management server  110  will be described. 
     First Exemplary Embodiment 
       FIG. 2  is a signal flow chart showing a process of tracking a location of construction equipment according to the first exemplary embodiment of the present disclosure. 
     First, the construction equipment  100  transmits locational information to the tracking vehicle  120  (S 200 ). 
     After storing the received locational information of the construction equipment  100  and locational information of the tracking vehicle  120  which is calculated through the GPS unit  126 , the tracking vehicle  120  displays the locational information of the construction equipment  100  through the display unit  128  (S 201  and S 202 ). 
     Thereafter, the tracking vehicle  120  examines whether a distance between the tracking vehicle  120  and the construction equipment  100  is less than a predetermined value D (S 203 ). As a result of the examination, if the distance between the tracking vehicle  120  and the construction equipment  100  is less than the predetermined value D, the process proceeds to step S 204  and if not, the process proceeds to step S 206 . 
     In step S 204 , the tracking vehicle  120  commands the change of a transmission cycle value of the locational information of the construction equipment  100 . Accordingly, the tracking vehicle  120  requests the construction equipment  100  to change the transmission cycle value to be shorter than an existing transmission cycle value (S 205 ). 
     In the meantime, the tracking vehicle  120  examines whether the location of the construction equipment  100  is moved in step S 206 . 
     As a result of the examination, if the location of the construction equipment  100  is moved, the tracking vehicle  120  requests the construction equipment  100  to change the transmission cycle value to be shorter than the existing transmission cycle value (S 207 ). 
     Further, after step S 207 , if there is no event for stopping tracking the location of the construction equipment  100 , the process proceeds to step S 200  and the tracking vehicle  120  continuously receives locational information from the construction equipment  100  to perform an operation for tracking the location of the construction equipment  100 . 
     However, if the location of the construction equipment  100  is not moved, the process proceeds to step S 201  to continuously perform the operation for tracking the location of the construction equipment  100 . 
     Second Exemplary Embodiment 
       FIG. 3  is a signal flow chart showing a process of tracking a location of construction equipment according to a second exemplary embodiment of the present disclosure. 
     Referring to  FIG. 3 , the construction equipment  100  and the tracking vehicle  120  transmit respective locational information to the management server  110  (S 300  and S 301 ). 
     After storing the received locational information of the construction equipment  100  and the tracking vehicle  120 , the management server  110  transmits the stored locational information of the construction equipment  100  to the tracking vehicle  120  (S 302  and S 303 ). At this time, the tracking vehicle  120  may display the received locational information of the construction equipment  100  through the display unit  128  depending on a set-up. 
     Thereafter, the management server  110  examines whether a distance between the tracking vehicle  120  and the construction equipment  100  is less than a predetermined value D (S 304 ). 
     As a result of the examination, if the distance between the tracking vehicle  120  and the construction equipment  100  is less than the predetermined value D, the process proceeds to step S 305  and if not, the process proceeds to step S 309 . 
     In step S 305 , the management server  110  commands the change of a transmission cycle value of the locational information of the construction equipment  100  and the tracking vehicle  120 . Accordingly, the management server  110  request the construction equipment  100  and the tracking vehicle  120  to change the transmission cycle value to be shorter than an existing transmission cycle value (S 306  and S 307 ). 
     Further, the management server  110  transmits the stored locational information of the construction equipment  100  to the tracking vehicle  120  (S 308 ). 
     Thereafter, in step S 309 , the management server  110  examines whether the location of the construction equipment  100  is moved. 
     As a result of the examination, if the location of the construction equipment  100  is moved, the management server  110  requests the construction equipment  100  and the tracking vehicle  120  to change the transmission cycle value to be shorter than the existing transmission cycle value (S 310  and S 311 ). Thereafter, if the tracking of the construction equipment  100  is completed, the transmission cycle value may be reset to an original set value. 
     Further, after steps S 310  and S 311 , if there is no event for stopping tracking the location of the construction equipment  100 , the process proceeds to steps S 300  and S 301  and the management server  110  continuously receives the respective locational information from the tracking vehicle  120  and the construction equipment  100  to perform an operation for tracking the location of the construction equipment  100 . 
     However, if the location of the construction equipment  100  is not moved, the process proceeds to step S 302  to continuously perform the operation for tracking the location of the construction equipment  100 . 
     As described above, although certain exemplary embodiments of the present disclosure have been described in detail, it is to be understood by those skilled in the art that the spirit and scope of the present disclosure are not limited to the certain exemplary embodiments, but are intended to cover various modifications and changes without departing from the subject matter of the present disclosure. 
     Accordingly, since the aforementioned exemplary embodiments are provided to inform those skilled in the art to which the present disclosure pertains of the scope of the present disclosure, it should be understood that the exemplary embodiments are illustrative only in all aspects and are not intended to be in any way limiting, and the present disclosure is just defined by the scope of the appended claims. 
     The present disclosure can reduce a communication cost as compared to a method in the related art of unconditionally shortening a transmission cycle in the case of tracking a location by controlling the transmission cycle of the locational information of construction equipment depending on the distance between the construction equipment and the tracking vehicle in the case of tracking a location of construction equipment and can prevent a theft by exactly determining the location of moving construction equipment to rapidly track the location of the construction equipment.