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

Claim 3:
4. 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;
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; and
supplying the second current to the solenoid until the rotational speed falls below the fifth rotational speed threshold value which is smaller than the first rotational speed threshold value when the rotational speed of the engine exceeds the first rotational speed threshold value.