| 摘要 |
A controlling device for a hydraulically operated cooling fan capable of obtaining optimum cooling efficiency by continuously controlling a rotational frequency of the cooling fan according to a cooling water temperature, a hydraulic oil temperature, and an engine speed is provided. To this end, the controlling device includes a hydraulic motor (16) for driving a cooling fan (13), a variable displacement hydraulic pump (14) capable of controlling the rotational frequency of the hydraulic motor (16), a cooling water temperature sensor (21) for detecting a cooling water temperature (TW), a hydraulic oil temperature sensor (22) for detecting a hydraulic oil temperature (To), an engine speed sensor (23) for detecting an engine speed (E), and a controller (20) which inputs detected signals from these sensors (21, 22, 23), computes and outputs a discharge capacity command value of the variable displacement hydraulic pump (14) according to the inputted cooling water temperature (Tw), hydraulic oil temperature (To), and engine speed (E), and continuously controls a rotational frequency (N) of the cooling fan (13) by means of the variable displacement hydraulic pump (14).
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