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Electro-hydraulic control system and method based on frequency-conversion speed regulation

A hydraulic control system, electro-hydraulic composite technology, applied in control/regulation system, non-electric variable control, flow control, etc. , long deceleration time and other problems, to achieve the effect of low energy loss, fast response speed, and speed up the response speed

Inactive Publication Date: 2003-01-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although frequency conversion technology has the advantage of energy saving, it has not been widely used in hydraulic systems like fans, water pumps and other fields, and is still limited to systems that are not frequently adjusted or have low dynamic requirements. The response speed of the inverter and the motor is slow, which cannot meet the requirements of the hydraulic system. Due to the large inertia of the motor and hydraulic pump, and the limited overcurrent and overload capacity of the power electronic device, the acceleration and deceleration time of the motor controlled by the frequency converter is relatively long. The dynamic response speed is slow and cannot meet the requirements of the hydraulic system

Method used

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  • Electro-hydraulic control system and method based on frequency-conversion speed regulation

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Embodiment Construction

[0033] like figure 1 As shown, the frequency converter 1 is connected to the hydraulic pump 3 via the motor 2, the hydraulic control system 5 and the energy control unit 6 are connected to the output port of the hydraulic pump 3 in parallel, the frequency converter 1, the motor 2, the hydraulic control system 5, and the energy adjustment unit 6 The detection signal is respectively connected to the detection feedback unit 4, and the feedback signal of the detection feedback unit 4 is connected to the controller 7, and the control signal output by the controller 7 controls the frequency converter 1, the hydraulic control system 5, and the energy adjustment unit 6 respectively.

[0034] 1) The hydraulic control system is a valve control system, which relies on hydraulic control valves (electro-hydraulic proportional valves, etc.) to control the speed and pressure of the system;

[0035] 2) The hydraulic pump is an ordinary hydraulic pump, which can be a quantitative pump or a var...

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Abstract

An electro-hydraulic control system based on frequency conversion type speed regulation is composed of frequency converter used to change rotation speed of pump, motor hydraulic pump, feedback unit for detection, hydraulic control system, energy regualting unit, and controller. The motor and hydraulic control valve are controlled by frequency converter. The electro-hydraulic control valve, energy regualting unit and frequency converter are controlled by controller. Its advantages are high efficiency, saving energy and high response speed.

Description

technical field [0001] The present invention relates to fluid pressure actuation systems. Background technique [0002] Electro-hydraulic control system has been widely used in various industries because of its fast response, high precision and large load. Electro-hydraulic control systems can be divided into two categories in terms of their control methods: throttling control systems and positive displacement Control System. [0003] The throttle control system controls the flow to the load through the electro-hydraulic control valve, and the excess flow output by the pump returns to the fuel tank through the relief valve. It is characterized by fast response and high precision, but due to the existence of overflow and throttling loss and low efficiency. The positive displacement control system meets the requirements of the system by adjusting the output flow of the pump, with high efficiency and energy saving, but the response speed is slow, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D7/00G05D16/00G05D27/00
Inventor 金波顾临怡
Owner ZHEJIANG UNIV
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