Antitheft device

Abstract

The present invention provides an anitheft device constructed such that when a stop signal is input from an engine (7), a main controller (2) outputs, until a first specified time Ts elapses, a connection signal to switches (8, 9) to execute an antitheft processing in the same manner as when the engine (7) is operated, instructs to the switch (9), after an elapse of the first specified time Ts, to repeat a connection and a disconnection at every specified time interval Deltat, and detects by a position detecting controller (3) a position at an instruction every time a connection is made to determined the possibility of a theft by comparing that position with a position at the engine stop, whereby it becomes unnecessary to always supply power to the controller (3) during the engine (7) stop to be able to save as much power supply to the controller (3) as time elapsed during which the switch (9) is disconnected and minimize the power consumption of a control device at the engine stop time.

Description

technical field [0001] The present invention relates to an anti-theft device installed on a self-propelled mobile body including a construction machine such as a hydraulic excavator and grasped by a management server at a place away from the mobile body. Background technique [0002] As this anti-theft device, for example, on JP-A-2000-73411, it is disclosed that, for example, the position of the self-propelled mobile body of the management object is detected by the Global Positioning System (GPS), and the detected position is transmitted by wireless communication. The technology of sending the position of the hydraulic excavator to the management server in a remote place, and confirming whether the position of the hydraulic excavator is within the predetermined normal operation range through the management server. [0003] In this prior art, when the position of the hydraulic shovel detected by GPS is judged to be out of the normal operation range, an engine stop signal is ...

AI Technical Summary

Problems solved by technology

The aforementioned prior art does not specifically mention the situation when the engine is stopped, but it is configured to continuously supply power to a control device that detects the position at all times and transmits and receives signals to and from the management server, for example, including when the engine is stopped. In the case of the power supply installed on the hydraulic excavator, that is, the voltage of the battery drops in a short period of time (so-called battery exhaustion), and it is necessary to perform frequent charging operations.

In addition, there is also the following problem: as in the above-mentioned prior art, the location information of the hydraulic excavator needs to be sent to the management server side, and when the management server side judges whether it is out of the normal operation range, the relationship between the hydraulic excavator and the management server The number of communications increases, and the communication cost is relatively high

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