| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus and a method for controlling a pumping rate of construction machinery and capable of speedily and highly efficiently cooling an operating fluid when operations are interrupted to speedily lower the temperature of the operating fluid due to excessive rises in the atmospheric temperature and the temperature of the operating fluid during the operations using construction machinery by controlling a pumping rate at a circulation rate required for speedily cooling. SOLUTION: In the construction machinery provided with both a variable-capacity pump connected to an engine and provided for driving an operating device by the amount of operation of an operating lever and a cooling control device for detecting the temperature of the operating fluid, variably controlling the speed of a cooling fan, and cooling the operating fluid, by not only making the cooling fan of the cooling control device variable according to temperature but also variably controlling the amount of circulation of the operating fluid according to temperature, it is possible to maintain speedy and highly efficient cooling performance. COPYRIGHT: (C)2007,JPO&INPIT
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