| 摘要 |
<p>A cooling system for a construction machine, which can reduce noise of a cooling fan and can reliably produce cooling air at a required flow rate. The cooling system comprises a cooling fan 25 for producing cooling air introduced to an intercooler 22, a radiator 23 and an oil cooler 24, a fan hydraulic motor 26 for driving the cooling fan 25, a fan hydraulic pump 27 for delivering a hydraulic fluid to the fan hydraulic motor 26, an air temperature sensor 31 for detecting an air temperature T 1 at an outlet of the intercooler 22, a cooling water temperature sensor 33 for detecting a temperature T 2 of cooling water for the radiator 23, a working oil temperature sensor 36 for detecting a temperature T 3 of working oil for the oil cooler 24, and a controller 29 for outputting a control signal corresponding to a maximum value among calculation values N 1 , N 2 and N 3 of cooling fan rotation speed, which correspond respectively to detected values T 1 , T 2 and T 3 from the air temperature sensor 31, the cooling water temperature sensor 33 and the working oil temperature sensor 36.</p> |
