Low-energy-consumption high-pollution-resistance ultrahigh-frequency-response digital hydraulic servo control system and control method

Abstract

The invention discloses a low-energy-consumption high-pollution-resistance ultrahigh-frequency-response digital hydraulic servo control system and a control method. The system comprises digital hydraulic switch valves, a hydraulic cylinder, a displacement sensor, pressure sensors and a digital controller, main pressure oil is respectively connected with main pressure oil ports of a first digital hydraulic switch valve and a second digital hydraulic switch valve, main return oil is respectively connected with secondary pressure oil ports of a third digital hydraulic switch valve and a fourth digital hydraulic switch valve, a secondary pressure oil port of the first digital hydraulic switch valve and a main pressure oil port of the third digital hydraulic switch valve are respectively connected with a hydraulic cylinder piston cavity oil port, a secondary pressure oil port of the second digital hydraulic switch valve and a main pressure oil port of the fourth digital hydraulic switch valve are respectively connected with a hydraulic cylinder rod cavity oil port, the displacement sensor, a first pressure sensor and a second pressure sensor are respectively connected with a comparator, and a signal generator is respectively connected with magnet exciting coils of the four digital hydraulic switch valves. According to the system, ultrahigh-frequency fluid pulse signals are directly converted, and therefore accurate control of hydraulic servo is realized.

Description

technical field [0001] The invention relates to a digital hydraulic servo control system and control method, in particular to a digital hydraulic servo control system and control method with low energy consumption, high pollution resistance and ultra-high frequency response characteristics. Background technique [0002] The position and force servo control in the existing hydraulic field usually adopts a servo valve or a proportional valve. Among them, the servo valve adopts the moving iron type or the moving coil type, which has good control characteristics, but the structure is complex, and the spool valve sleeve of the slide valve type is sensitive to the cleanliness of the oil, the system failure rate is high, the energy consumption is large, and the later operation and maintenance requirements And the cost is high; the control performance of the proportional valve is second, and the structure is moderate compared with the servo valve, and the sensitivity of the proporti...

AI Technical Summary

Problems solved by technology

Among them, the servo valve adopts the moving iron type or the moving coil type, which has good control characteristics, but the structure is complex, and the spool valve sleeve of the slide valve type is sensitive to the cleanliness of the oil, the system failure rate is high, the energy consumption is large, and the later operation and maintenance requirements And the cost is high; the control performance of the proportional valve is second, and the structure is moderate compared with the servo valve, and the sensitivity of the proportional valve to the oil is greatly reduced, the system is more reliable, but the maintenance cost is higher

Whether it is a servo valve or a proportional valve, an analog control method is required to control the position and force, so the control is easily disturbed by the environment, resulting in unreliable system operation.

The above factors have caused technical problems such as complex structure, high power consumption and low reliability of the existing hydraulic servo control system.

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