| 摘要 |
PROBLEM TO BE SOLVED: To precisely prevent an engine stall from occurring by unloading a hydraulic pump.SOLUTION: A hydraulic control device includes: auxiliary machine operation detection means of detecting an auxiliary machine being in operation for a hydraulic pump 131 for a machine; first determination means of determining whether discharge pressure detected by discharge pressure detection means 131P is higher than first predetermined pressure; second determination means of determining whether the load of the operation, detected by the auxiliary machine operation detection means, placed on an engine 190 is higher than a predetermined value; condition determination means of determining that an unloading condition is met when the first determination means determines that the discharge pressure is higher than the first predetermined pressure and the second determination means determines that the load of the operation of the auxiliary machine placed on the engine 190 is higher than the predetermined value; and control means of releasing oil pressure discharged from the hydraulic pump by unloading means to a tank 139 when the condition determination means determines that the unloading condition is met. |
