Patent ID: 8370095
Filing Date: 2013-02-05
Classification: B66F,G07C

Abstract:
1. A method for clocking cumulative operating time for a cargo-handling vehicle provided with a plurality of functional units, the functional units comprising at least a first functional unit and a second functional unit, the first functional unit comprising the first clocking device for clocking the cumulative operating time of the vehicle, the first memory device for storing the cumulative operating time clocked by the first clocking device and, the communication port for communicating with the outside of the first functional unit, the second functional unit comprising the second clocking device for clocking the cumulative operating time of the vehicle, the second memory device for storing the cumulative operating time clocked by the second clocking device, and the communication port for communicating with the outside of the second functional unit; whereby, the first clocking device and the second clocking device clock the cumulative operating time of the vehicle independently of each other so as to configure a duplex system for clocking the cumulative operating time of the vehicle; each of the first and second memory devices storing the cumulative operating time clocked by corresponding clocking device; the cumulative operating time stored in the first memory device is transmitted toward the second memory device through a communication port in the first functional unit and a communication port in the second functional unit at the time points of predetermined time intervals periodically, whereas the cumulative operating time stored in the second memory device is transmitted toward the first memory device through the communication port in the first functional unit and a communication port in the second functional unit at the time points of predetermined time intervals; the difference between the cumulative time stored in the first functional unit and the cumulative time stored in the second functional unit is computed in each of the first and second functional units, so that it is grasped whether or not the cumulative operating time stored in one side functional unit is greater than or equal to the cumulative operating time stored in the other side functional unit; the cumulative operating time stored in the memory device in one side functional unit is renewed with the cumulative operating time stored in the memory device in the other side functional unit in a case where the cumulative operating time stored in the memory device in the one side functional unit is smaller than the cumulative operating time stored in the memory device in the other side functional unit, whereas the cumulative operating time stored in the memory device in one side functional unit is conserved on an as-is basis in a case where the cumulative operating time stored in the memory device in the one side functional unit is greater than or equal to the cumulative operating time stored in the memory device in the other side functional unit.