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Compensation method, device, excavator and processor for excavator proportional valve hysteresis

A compensation method and technology of a compensation device, which are applied to mechanically driven excavators/dredgers, earth movers/shovels, special data processing applications, etc., can solve the problem of reducing the control stability of excavators and affecting hydraulic excavators. The accuracy of electro-hydraulic proportional control and other problems can be solved to improve the accuracy and stability, solve the pressure fluctuation of the main pump, and reduce the error.

Active Publication Date: 2022-07-08
中联重科土方机械有限公司 +1
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Problems solved by technology

However, in this technical solution, in the actual working process of the hydraulic excavator, the spool needs to overcome static friction and hydraulic oil resistance to move after receiving the electrical signal, resulting in a hysteresis phenomenon in the proportional valve after receiving the electrical signal, which seriously affects hydraulic excavation. The accuracy of the electro-hydraulic proportional control of the excavator reduces the control stability of the excavator

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  • Compensation method, device, excavator and processor for excavator proportional valve hysteresis
  • Compensation method, device, excavator and processor for excavator proportional valve hysteresis
  • Compensation method, device, excavator and processor for excavator proportional valve hysteresis

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Embodiment Construction

[0053] The specific implementations of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only used to illustrate and explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention.

[0054] figure 1 A schematic flowchart of a method for compensating a proportional valve hysteresis loop of an excavator according to an embodiment of the present invention is schematically shown. like figure 1 As shown, in an embodiment of the present invention, a compensation method for a proportional valve hysteresis loop of an excavator is provided, which includes the following steps:

[0055] In step S101, the main pump pressure signal is acquired according to the target action.

[0056] Step S102, generating a corresponding PWM signal according to the pressure signal.

[0057] Step ...

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Abstract

Embodiments of the present invention provide a compensation method, device, excavator and processor for hysteresis of proportional valve of an excavator. The excavator includes a main pump, a controller and a proportional valve. The method includes: acquiring a target action of the main pump; The target action is to generate a corresponding PWM signal; superimpose the dither signal on the PWM signal; and output the PWM signal after superimposing the dither signal to the proportional valve to reduce the hysteresis of the proportional valve. By optimizing the controller program, the hysteresis of the proportional valve is compensated and improved without changing the electro-hydraulic control system and the original PWM output frequency. At the same time, because the PWM output signal is constantly changing and responding, the control accuracy of the proportional valve is greatly improved, and the error when the controller adjusts the proportional valve for reciprocating motion is reduced, which significantly improves the accuracy and stability of the hydraulic system.

Description

technical field [0001] The invention relates to the technical field of proportional valves, in particular to a compensation method, device, excavator and processor for hysteresis of a proportional valve of an excavator. Background technique [0002] Electro-hydraulic proportional control valve is a key component of hydraulic control system. The electro-hydraulic proportional valve is a typical nonlinear time-varying system. Due to the hysteresis of the electromagnetic circuit of the electromagnet and the clearance in the proportional valve, the input current of the proportional valve is in a reciprocating cycle, and the input corresponding to the same output pressure or flow rate. The percentage of the input current of the maximum difference of the current is called the hysteresis error of the proportional valve. The smaller the hysteresis error is, when the proportional valve circulates back and forth under the action of the input current, the smaller the pressure output d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/17E02F9/00E02F9/22E02F3/04
CPCG06F30/17E02F9/00E02F9/22E02F9/2264E02F9/2267E02F9/2278E02F3/04
Inventor 刘行行高见厂吴元峰魏学平姚小奇
Owner 中联重科土方机械有限公司
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