INDUSTRIAL VEHICLE

摘要

An industrial vehicle includes an engine, a hydraulic pump, a hydraulic operation device, a supply passage, a drainage passage, an unloading valve that connects the supply passage and the drainage passage to each other, and a controller that controls open/closed state of the unloading valve. If an on-load period at the time of application of load on the engine is less than a first predetermined time, the controller performs open/close control of causing the unloading valve to enter the closed state to set an on-load state, thereby increasing pressure of hydraulic oil passing through the supply passage and then causing the unloading valve to enter the open state.

主权项

1. An industrial vehicle comprising:
an engine; a hydraulic pump driven by the engine; a hydraulic operation device operated by oil pressure; a connection passage that connects the hydraulic pump and the hydraulic operation device to each other; an electromagnetic control valve that is connected to the connection passage and controls supply and drainage of hydraulic oil to and from the hydraulic operation device; a supply passage through which the hydraulic oil supplied to the hydraulic operation device flows; a drainage passage through which the hydraulic oil drained to an oil tank flows; an unloading valve that connects the supply passage and the drainage passage to each other; a relief valve that is connected to the supply passage and operated by pressure of the hydraulic oil flowing through the supply passage; and a controller that controls open/closed state of the unloading valve, wherein, if an on-load period at the time of application of load on the engine is less than a first predetermined time, the controller performs open/close control of causing the unloading valve to enter the closed state to set an on-load state, thereby increasing the pressure of the hydraulic oil passing through the supply passage and then causing the unloading valve to enter the open state.