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

Claim 12:
13. 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 is greater than the second rotational speed threshold value and the temperature of the hydraulic fluid exceeds the first threshold temperature, a fifth current that has a fifth magnitude equal to or smaller than the first magnitude to the solenoid of the variable relief valve to close the variable relief valve such that hydraulic fluid output from the hydraulic pump flows through the oil passage by a third flow rate which is larger than the first flow rate and which increases as the rotational speed of the engine increases.