Device for controlling control valve of construction machine, method for controlling same, and method for controlling discharge flow rate of hydraulic pump

Abstract

Disclosed are a device for controlling a control valve of a construction machine, a method for controlling the same, and a method for controlling the discharge flow rate of a hydraulic pump, for the purpose of controlling the spool switching rate of a direction switching valve and the discharge flow rate of a hydraulic pump according to the temperature of operating oil in sub-zero temperatures of winter seasons. A device for controlling a control valve of a construction machine according to the present invention comprises: a variable capacity-type hydraulic pump; a hydraulic actuator driven by operating oil supplied from the hydraulic pump; a control valve installed on a channel between the hydraulic pump and the hydraulic actuator to control the activation, deactivation, and direction change of the hydraulic actuator during switching; a manipulation lever for outputting a manipulation signal so as to correspond to the amount of manipulation; a temperature sensor for detecting the temperature of operating oil in an operating oil tank connected to the hydraulic pump; and a controller for applying a control signal, which corresponds to the amount of manipulation of the manipulation lever, to the control valve when a signal from the temperature sensor confirms that the detected temperature of the operating oil is higher than a preset temperature, the controller adjusting a manipulation signal, which conforms to the amount of manipulation of the manipulation lever, by increasing the manipulation signal at a predetermined ratio so as to correspond to the detected temperature of the operating oil when a signal from the temperature sensor confirms that the detected temperature of the operating oil is lower than the preset temperature, and the controller applying the adjusted control signal to the control valve.

Description

technical field [0001] The present invention relates to an apparatus and method for controlling a control valve of construction machinery and a method for controlling the discharge flow rate of a hydraulic pump of construction machinery, more particularly, the present invention relates to such a control valve for controlling construction machinery An apparatus and method and a method for controlling a discharge flow rate of a hydraulic pump of a construction machine, which can control a spool displacement speed of a directional valve and a discharge flow rate of a hydraulic pump according to the temperature of a hydraulic fluid in winter having a subzero temperature. Background technique [0002] Generally speaking, the hydraulic fluid used to operate the hydraulic actuators of construction machinery can be used in the temperature range of plus 90 degrees Celsius (+90°C) to minus 20 degrees Celsius (-20°C). Each area has different ambient temperatures. In winter, constructio...

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Problems solved by technology

Due to this, the pressure loss increases compared to the temperature condition above zero degrees, so the pressure of the hydraulic fluid discharged from the hydraulic pump may suddenly increase, or an abnormal phenomenon such as trembling of the working equipment may occur

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