| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hydraulic control device for a construction machine capable of preventing the working performance from dropping in the altitude operations while the durability of the engine components is well secured. <P>SOLUTION: The hydraulic control device of the construction machine is equipped with an engine 1, at least one hydraulic pump 3 of variable displacement type driven by the engine 1, at least one actuator 7 driven with the discharge oil of the pump 3, an exhaust gas temperature sensor 13 to sense the temperature t of the exhaust gas from the engine, a controller 12 to control the operating pilot pressure Px produced by a solenoid proportional decompression valve 11 in accordance with the sensing result of the sensor 13, and a regulator 5 to control the rate of discharge flow Q so as to limit the maximum of the input torque T of the pump 3 in accordance with the operating pilot pressure Px. <P>COPYRIGHT: (C)2004,JPO |
