Patent ID: 8909387

Claim:
An operation vehicle monitoring device, including a display unit configured to display a standard screen that displays state quantity of at least engine water temperature and remaining fuel amount as an operation state of an operation vehicle, and a service menu display screen for performing a maintenance and setting of the operation vehicle, and the service menu display screen being transitioned from the standard screen by a manager's predetermined operation and displayed, where the service menu display screen displays a plurality of menus related to the maintenance and setting of the operation vehicle, a monitoring item selection screen is shifted and displayed in which it is possible to select a plurality of monitoring items corresponding to a selected menu in case where one of the plurality of menus is selected, and the display unit displays a monitoring item selected from the plurality of monitoring items related to the operation state of the operation vehicle, comprising: an input unit configured to input, by the manager, a signal that instructs a registration of the selected monitoring item; a storage unit configured to register the monitoring item according to the input signal by the instruction of the registration; a display control unit configured to force the display unit to display the monitoring item registered in the storage unit; and a signal detection unit configured to detect a key-on signal and a key-off signal generated when a key switch of the operation vehicle is turned on and off respectively, and wherein when the monitoring item registered in the storage unit is displayed in the display unit by the manager's predetermined operation, the display unit displays, in a same screen, the monitoring item registered in the storage unit, the current detection content of the monitoring items registered in the storage unit, and the state quantity of the engine water temperature and the remaining fuel amount and displays, by a graphic or a character, the state quantity, and the display unit further displays a type of the state quantity by a graphic, the monitoring device comprises a function of changing a screen displayed by the display unit immediately after a key-on signal is detected, according to time from when the signal detection unit detects a key-off signal when a key-off is performed in a case that the current detection content of the monitoring items is displayed in the display unit till when the signal detection unit detects the key-on signal, and the function comprises that: in a case where the signal detection unit detects the key-on signal before a predetermined time has elapsed after detecting the key-off signal, the display control unit forces the display unit to display the current detection content of the monitoring items registered in the storage unit, and in a case where the signal detection unit detects the key-on signal after the predetermined time has elapsed after detecting the key-off signal, the display control unit forces the display unit to display the standard screen.