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Proportional valve performance test algorithm

A proportional valve and algorithm technology, applied in the fields of digital signal processing and hydraulic component parameter measurement principle, can solve the problem of inaccurate calculation of flow characteristics, and achieve the effect of solving inaccurate calculation of flow characteristics, obvious effect and good algorithm stability.

Active Publication Date: 2018-03-09
NANJING CHENGUANG GRP
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Problems solved by technology

[0009] Compared with the prior art, the present invention has significant advantages: the present invention effectively solves the problem of inaccurate calculation of flow characteristics during proportional valve performance testing through a data processing method combining low-pass filtering and segmented polynomial fitting , the algorithm has good stability and obvious effect, and can be adapted to many occasions that require data preprocessing

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Embodiment Construction

[0013] The present invention proposes a calculation method of segmented fitting on the basis of the whole fitting function, and solves the phenomenon of unstable calculation in the background art.

[0014] The proportional valve performance test algorithm of the present invention, the specific implementation method steps are as follows:

[0015] Step 1: Determine the cut-off frequency f of the low-pass filtering parameters according to the field conditions 截止 , and input from the software configuration interface;

[0016] Step 2, start the test, collect the proportional valve input signal and flow output signal, and respectively substitute the input signal and flow output signal into the differential equation formula

[0017]

[0018] in, Indicates the value after the nth point filter is adopted, Indicates the value after the n-1th point filter, Y n Indicates the nth unfiltered acquisition value, sampling frequency f=1 / ΔT, filtering parameter a=T f / ΔT, time constant...

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Abstract

The invention discloses a proportional valve performance test algorithm. Input signals and output flow which are acquired by a computer are subjected to low pass filtering, the filtered data is subjected to quadratic polynomial fitting according to input section subsection of the input signals, the same input signals and the maximum difference values of different output flow of the sections are found out, and finally the maximum value is found out in one set of maximum difference values to serve as a flow characteristic hysteresis. By means of the proportional valve performance test algorithm,the problem that the flow characteristic is calculated inaccurately in the proportional valve performance testing process is effectively solved, the algorithm stability is good, the effect is obvious, and the proportional valve performance test algorithm can adapt to a plurality of occasions needing data pretreatment.

Description

technical field [0001] The invention belongs to the field of testing and measurement of hydraulic components, and relates to a hydraulic component parameter measurement principle and digital signal processing; parameter value. Background technique [0002] The performance test of the electro-hydraulic proportional valve is a necessary test for its delivery. The accuracy of its parameters is related to the selection of the proportional valve of the servo system. The design of the control parameters of the servo system plays a vital role in the stability and reliability of the servo system. effect. [0003] The definition of flow hysteresis in the performance characteristics of proportional valve is that the maximum value of the difference between different outputs under the same input is the flow hysteresis. For the calculation of this parameter, a recorder is traditionally used to draw the XY graph of the input and output of the proportional valve, X represents the input s...

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Application Information

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IPC IPC(8): F15B19/00
CPCF15B19/007F15B2211/855
Inventor 顾友华曹克丰张高峰
Owner NANJING CHENGUANG GRP
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