Patent ID: 9651062
Date: 2017-05-16
CPC Classifications: E02F,F15B

Claim:
1. A construction machine having actuators driven by a working fluid, comprising: a storage portion configured to store the working fluid; first and second pumps configured to discharge the working fluid; a first control valve configured to control communication conditions between the first pump and the storage portion and between the first pump and a first actuator of the actuators; a second control valve configured to control communication conditions between the second pump and the storage portion and between the second pump and a second actuator of the actuators; a first throttle configured to throttle a flow of the working fluid flowing from the first control valve to the storage portion; a second throttle configured to throttle a flow of the working fluid flowing from the second control valve to the storage portion; a pressure obtaining unit configured to obtain a first pressure of the working fluid between the first control valve and the first throttle and a second pressure of the working fluid between the second control valve and the second throttle; a mode determination unit configured to determine, by comparing the first and second pressures with first and second determination pressure values respectively, a comparison result which is whether an operating mode of the construction machine is a specific operating mode in which the first actuator is driven; and a determination pressure value setting unit configured to modify the first and second determination pressure values on a basis of the comparison result of the mode determination unit; wherein the mode determination unit determines the operating mode is the specific operating mode when the first pressure is smaller than the first determination pressure value and the second pressure is larger than the second determination pressure value, and further wherein when the mode determination unit determines that the operating mode is the specific operating mode, the determination pressure value setting unit increases the first determination pressure value and decreases the second determination pressure value.