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Proportional valve performance test method

A test method and technology of proportional valves, which are applied in fluid pressure actuation system testing, servo meter circuits, mechanical equipment, etc., can solve problems such as inaccurate calculation of flow characteristics, and achieve inaccurate calculation of flow characteristics and good algorithm stability , the effect is obvious

Active Publication Date: 2019-05-07
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-process fitting function, which solves the phenomenon of unstable calculation described in the background art.

[0014] Proportional valve performance test method of the present invention, the concrete realization method step is as follows:

[0015] Step 1, according to the site conditions, determine the cut-off frequency f of the low-pass filter parameters 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 nth point filtering, Indicates the value after n-1 point filtering, Yn indicates the n-th unfiltered collection value, sampling frequency f=1 / ΔT, filter parameter a=T f / ΔT, time constant T f =1 / (2*π*f...

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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 test and measurement of hydraulic components, and relates to the principle of parameter measurement of hydraulic components and digital signal processing; specifically, the computer obtains data according to the principle of parameter measurement of proportional valves, and obtains accurate data processing through signal processing and specific parameter calculation methods. parameter value. Background technique [0002] The performance test of the electro-hydraulic proportional valve is a necessary test for its factory. The accuracy of its parameters is related to the selection of the proportional valve of the servo system and the design of the control parameters of the servo system, which plays a vital role in the stability and reliability of the servo system. role. [0003] The definition of flow hysteresis in the performance characteristics of the proportional valve is that the maximum value of the difference ...

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Application Information

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Patent Type & Authority Patents(China)
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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