Intelligent pump and active-disturbance-rejection control method thereof

Abstract

The invention discloses an intelligent pump and an active-disturbance-rejection control method thereof. The active-disturbance-rejection control method comprises the steps that the motor rotating speed read from a motor driver is combined with the pressure of a high-pressure outlet measured by a pressure sensor to estimate the load flow, the desired rotating speed is obtained according to the speed corresponding to the load flow and the speed corresponding to the pressure deviation and transmitted to a rotating speed controller, according to the desired torque and the current rotating speed ofan alternating-current permanent magnet synchronous motor, the load torque is estimated by the rotating speed controller, the sum of the current value corresponding to the load torque and the currentvalue corresponding to the speed deviation is taken as a command current, and the command current is sent to the motor driver through a CANopen bus. According to the intelligent pump and the active-disturbance-rejection control method thereof, the outlet pressure of the pump and the output flow of the pump can be controlled according to the actual needs of the load, the overflow loss can be lowered, and oil liquid heating is reduced; the contradiction between the rapidity of pressure control and overshoot is solved; it can also be guaranteed that the performance is controlled under the condition of fast load change; and the contradiction between the excellent control effect and an accurate mathematical model is solved.

Description

technical field [0001] The present invention relates to the technical field of intelligent control, and more specifically relates to an intelligent pump and an active disturbance rejection control method for the intelligent pump. Background technique [0002] The traditional hydraulic actuation system generally uses a central constant pressure hydraulic pump source to supply oil. The heat generated by the excess flow overflow of the pump source system will increase the temperature of the oil. If the heat dissipation is not good, the aging of the medium will be accelerated. Therefore, an intelligent pump is proposed, which can adjust the output flow and outlet pressure of the pump according to the demand of the load (hydraulic cylinder, hydraulic motor), so as to achieve the purpose of energy saving and emission reduction. [0003] The control of intelligent pumps ultimately comes down to the control of pump output flow. There are three main ways to change the output flow of...

AI Technical Summary

Problems solved by technology

If the outlet pressure of the pump changes greatly, but the speed of the hydraulic pump must be controlled well, this will bring great difficulty to the control

[0005] However, traditional error-based feedback control, such as conventional PID control, has problems, such as the contradiction between rapidity and overshoot, and it is difficult to ensure a good control effect in the case of large load disturbance changes

Disturbance rejection against changes is also poor

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