Patent ID: 7643938

Claim:
A location confirmation method of a construction machine applied to a system comprised of a construction machine provided with a controller, a locator, a first communicator and a power key for controlling a switch that supplies operating electric power when switched on, and a timer circuit for providing an ON control signal for a predetermined period of time and periodically at predetermined intervals of time, to said controller, said locator and said first communicator when said power key is switched off; and a no operation scheduled button for generating data about an operation schedule, and a center server provided with a second communicator, a memory, and a location information provider, said location confirmation method comprising: supplying at said construction machine electric power to said controller, said locator and said first communicator for operation for said predetermined period of time as determined by said ON control signal that is provided by said timer circuit after said power key is switched off, and sending current location data, measurement time data, and said data about an operation schedule to said center server by said controller and said first communicator if said current location data measured by said locator differs from previously measured location data by a predetermined value during said predetermined period of time, stopping the supply of the electric power to said controller, said locator and said first communicator, and after said predetermined period of time elapses, periodically supplying the electric power to said controller, said locator and said first communicator at predetermined intervals of time as determined by said ON control signal provided by said timer circuit and measuring a current location by said locator at said predetermined time intervals and sending current location data, measurement time data, and said data about operation schedule to said center server by said controller and said first communicator; and receiving at said center server said current location data, said measurement time data, and said data about operation schedule sent from said construction machine at said second communicator and successively storing said current location data, said measurement time data, and said data about operation schedule in said memory and providing location confirmation by said location information provider using said current location data and said measurement time data, and judging an abnormal situation of said construction machine when said location confirmation indicates movement of said construction machine and said data about operation schedule indicates no movement scheduled.