KR920010084A - Optimum working flow control device of excavator and its control method - Google Patents

Abstract

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Description

Optimum working flow control device of excavator and its control method

Since this is an open matter, no full text was included.

1 is a schematic hydraulic circuit diagram of an excavator equipped with a device according to the invention.

2 is a block diagram of a control system according to the apparatus of the present invention.

3 is a flowchart showing a process of controlling the discharge flow rate and the flow rate distribution of the pump.

Claims (3)

Each actuator of the excavator is provided with displacement sensors 23a, 23b, 23c, 23d, 23e, and 23f for detecting its operating state, and the detection sensors 23a, 23b, 23c, 23d, 23e, and 23f. An operation lever / pedal 21 for controlling the operation of each actuator is electrically connected to an electronic controller 24 with a built-in microcomputer, while the electronic controller 24 is provided with a first and second drive by the engine 1. The swash plate angle control valves 19a and 19b for adjusting the swash plate angles of the second pumps 3 and 4 to the internal pilot pressure, and the control valves 23a for controlling the supply amount of the working pressure oil supplied to the respective actuators. Electronic proportional control valve blocks (22a, 22b) for adjusting the sprue movements of 23b, 23c, 23d, 23e, and 23f to the internal pilot pressure, and an operation lever / pedal 21 for operating the respective actuators. Optimal working flow control device for excavators electrically connected to each other. An operation amount judging step of the operation lever / pedal 21 for judging an operation amount by receiving an electrical signal having a size corresponding to the operation angle according to the operation of the operation lever / pedal 21 for each actuator of the excavator; A required discharge flow rate calculating step of calculating a required discharge flow rate of the first and second pumps (3, 4) corresponding to the operation requirements of the actuator to be operated according to the operation amount of the operation lever / pedal (21); Calculating a required operation amount of the actuator control valve for moving the sprue of the associated control valve so that the operating pressure oil corresponding to the operation amount of the operation lever / pedal 21 is injected into the actuator; According to the discharge flow rate of the pump calculated in the calculation of the required discharge amount of the pump and the operation amount of the control valve calculated in the calculation of the required operation amount of the actuator control valve, the first and second pumps 3 and 4 should each be discharged. A discharge amount distribution calculating step of calculating a flow rate; An excavator comprising a signal output step of outputting the swash plate angle control valves 19a and 19b through the amplifier 26 to adjust the swash plate angle adjustment mechanisms 20a and 20b with the final signal processed in the discharge amount distribution calculation step. Optimal operating flow control method. An operation amount judging step of the operation lever / pedal 21 for judging an operation amount by receiving an electrical signal having a size corresponding to the operation angle according to the operation of the operation lever / pedal 21 for each actuator of the excavator; Computing the current movement speed (V _f ) of the actuator with the electrical movement detected by the required movement speed (V _i ) of the actuator and the displacement sensor installed in each actuator according to the manipulation amount of the operation lever / pedal (21) Actuator speed calculating step; The relative difference between the two speeds calculated in this actuator speed calculation step ( An overload detection step of determining which actuator is overloaded according to this speed difference value by obtaining V _i -V _f ); A composite operation judging step of judging whether two or more actuators and the first and second pumps 3 and 4 are operating at the same time as well as determining whether a control process corresponding to an overload is set the previous time; Input that is already controlling the input value set by the last time control process speed (V _O) if the two values are determined to be identical by comparing the current actuator velocity of (V _f) and outputting a continue the set control value is the Calculating the output ratio of a constant ratio for each actuator whose required ratio is calculated according to the load on each actuator when the V _f and V _O values are different; Control signal output that outputs a control signal for controlling the actuator's control valve according to the value calculated in the step of calculating the output ratio of the predetermined ratio to the electromagnetic proportional control valve block 22a, 22b through the amplifiers 25a, 25b. Optimal flow control method in case of overload of excavator consisting of two steps. ※ Note: The disclosure is based on the initial application.