| 摘要 |
PURPOSE:To prevent the generation of cavitation by a method wherein the discharging amount of a pump is increased by increasing the command of revolving number of an engine as well as the same of the angle of a swash plate for a pump when there is a danger to generate the caviation in a hydraulic pressure system. CONSTITUTION:A cavitation critical pressure Px is set by an operating circuit 18b-6 at first, then, an output value P of a pump discharging pressure detector 15 and a detector 18a is compared with said value Px by the operating circuit 18b-7 to decide the existence of the danger of cavitation in the hydraulic pressure system. In case the danger is existing, the NO terminal of the operating circuit 18b-7 is put ON and the set value of the discharging amount of the pump, operated by the operating circuits 18b-1', 18b-2' based on the measured value thereof, is corrected to increase the command of the angle of the swash plate for the pump. Further, an engine load horse power, operated by the operating circuit 18b-4', 18b-5' based on the measured values thereof, is corrected to increase the command of the revolving number of the engine based on the corrected horse power and prevent generation of the cavitation. |
