Point position control method, hydraulic control system and engineering vehicle

A hydraulic control system and point-position control technology, which is applied in the field of hydraulic control, can solve the problems of fast and precise control, the dead zone of the electro-hydraulic proportional device, and nonlinearity, so as to reach the target position smoothly and avoid overshoot and undershoot. tune effect

Active Publication Date: 2021-04-30
长沙九方湾流智能科技有限公司
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Problems solved by technology

[0004]Because the electro-hydraulic proportional device has many problems such as median dead zone, hysteresis, nonlinearity, etc. In addition, these characteristics are also affected by factors such as hydraulic oil viscosity and hydraulic oil temperature. impact, making it very difficult to achieve fast and precise control throughout the long life cycle of the device

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  • Point position control method, hydraulic control system and engineering vehicle
  • Point position control method, hydraulic control system and engineering vehicle
  • Point position control method, hydraulic control system and engineering vehicle

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Embodiment Construction

[0034] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0035] figure 2 A schematic diagram of the current-spool curve. figure 2The general characteristics of electrohydraulic proportional valves are shown. I_dead is called the dead zone current, which is the minimum current value for the spool of the electro-hydraulic proportional valve to open. I_max is called the maximum current, which is the current value at which the spool of the electro-hydraulic proportional valve is 100% open. Between the dead zone current I_dead and the maximum current I_max, the opening amount of the spool is approximately proportional to the inc...

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Abstract

The invention relates to a point location control method, a hydraulic control system and an engineering vehicle. The point location control method comprises the steps that before a hydraulic driving device moves in a decelerated mode and moves to a sliding area, whether current input into an electro-hydraulic proportional valve is smaller than preset sliding current or not is judged; if yes, the current input into the electro-hydraulic proportional valve is switched to be the preset sliding current; when the hydraulic driving device moves to the sliding area, whether the current input into the electro-hydraulic proportional valve is larger than or equal to the preset sliding current or not is judged; if yes, the current input into the electro-hydraulic proportional valve is switched to be the preset sliding current; and after the magnitude of the current input into the electro-hydraulic proportional valve is switched to be the preset sliding current, the magnitude of the current input into the electro-hydraulic proportional valve is continuously controlled to be the preset sliding current until the hydraulic driving device moves to the target position. By adopting the point location control method, the hydraulic driving device can quickly, accurately and stably reach the target position.

Description

technical field [0001] The present application relates to the technical field of hydraulic control, in particular to a point control method, a hydraulic control system and an engineering vehicle. Background technique [0002] In the field of hydraulic control, it is often necessary to perform precise position control on hydraulic cylinders, hydraulic motors and other hydraulic drive devices, such as controlling hydraulic cylinders to accurately expand and contract from any point to a certain point, and hydraulic motors to precisely rotate from any angle to a certain angular position. The precise point control of hydraulic cylinders or hydraulic motors is generally realized through electro-hydraulic proportional valves. The electro-hydraulic proportional valve is a component in which the proportional electromagnet in the valve generates corresponding actions according to the input voltage signal, so that the valve core of the working valve is displaced, the size of the valve ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B21/08
CPCF15B21/08F15B2211/63F15B2211/6656
Inventor 邓侃郭超
Owner 长沙九方湾流智能科技有限公司
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