초록 ▼

A target fan rotation speed FANRPM is set corresponding to the temperature Tc sensed by a cooling water temperature sensing unit. A capacity control unit (controller, EPC valve )is then used to control the capacity of a hydraulic pump (or a hydraulic motor) so that the fan rotation speed N of the co

A target fan rotation speed FANRPM is set corresponding to the temperature Tc sensed by a cooling water temperature sensing unit. A capacity control unit (controller, EPC valve )is then used to control the capacity of a hydraulic pump (or a hydraulic motor) so that the fan rotation speed N of the cooling fan becomes the target fan rotation speed FANRPM. In this way, when the cooling fan is driven by a hydraulic source, it can be driven with optimal energy efficiency and noise can be controlled to a minimum.

대표청구항 ▼

1. A cooling fan drive control device comprising a hydraulic pump driven by a drive source, a cooling fan which cools cooling water of the drive source and also cools pressure oil of equipment operated by the drive source, and a hydraulic motor which is operated by pressure oil discharged from the h

1. A cooling fan drive control device comprising a hydraulic pump driven by a drive source, a cooling fan which cools cooling water of the drive source and also cools pressure oil of equipment operated by the drive source, and a hydraulic motor which is operated by pressure oil discharged from the hydraulic pump and causes the cooling fan to rotate,wherein the cooling fan drive control device further comprises: a cooling water temperature sensing means which senses a temperature of the cooling water; a pressure oil temperature sensing means which senses a temperature of the pressure oil; a target fan rotation speed setting means which sets a target fan rotation speed to a first target fan rotation speed corresponding to the cooling water temperature sensed by the cooling water temperature sensing means, or to a second target fan rotation speed corresponding to the pressure oil temperature sensed by the pressure oil temperature sensing means, whichever is the larger; and a capacity control means which controls a capacity of the hydraulic pump or the hydraulic motor according to a difference between a fan rotation speed of the cooling fan and the target fan rotation speed set by the target fan rotation speed setting means.