| 摘要 |
An actuator displacement measuring system in an electro-hydraulic system for a construction machine is disclosed, which can detect an actuator displacement using the characteristics of an electro-hydraulic system. The actuator displacement measuring system includes controlling driving of an electric motor, determining whether the electric motor is driven, determining whether a set pressure value of a relief valve is larger than or equal to a measured pressure value of the hydraulic system if a displacement value of an actuator that is always detected deviates from a zero value of a reference position, setting the actuator displacement value to a previous value if a pressure value of the hydraulic system is larger than or equal to a pressure value of a relief valve and calculating the actuator displacement value using a rotating speed of the electric motor, a sectional area of the actuator, and a supply flow rate of a hydraulic pump if the pressure value of the hydraulic system is smaller than the pressure value of the relief valve, and finishing the calculation after storing the actuator displacement value calculated up to now in a controller if a power-off request of the hydraulic system is input and moving to an initial stage if the power-off request of the hydraulic system is not input. |
