Patent ID: 11866911
Assignee: KUBOTA CORPORATION
Field: Civil engineering (Other fields)
Classification: CPC E  F | IPC E  F

Claim 5:
6. A control method for a fan of a work vehicle, comprising:
supplying, when an engine is started, a first current that has a first magnitude to a solenoid of a variable relief valve connected to an oil passage such that hydraulic fluid output from a hydraulic pump driven by the engine flows through the oil passage by a first flow rate to rotate a hydraulic motor connected to the oil passage;
supplying, when a rotational speed of the engine becomes larger than a first rotational speed threshold value, a second current that has a second magnitude larger than the first magnitude to the solenoid such that the hydraulic fluid flows through the oil passage by a second flow rate smaller than the first flow rate to reduce a rotational speed of the fan; and
supplying, when the rotational speed of the engine becomes larger than a second rotational speed threshold value that is larger than the first rotational speed threshold value, a current to the solenoid to change the rotational speed of the fan, the current corresponding to a temperature of liquid flowing in the work vehicle,
wherein the second rotational speed threshold value is smaller than an idling rotational speed of the engine.