Variable pitch proportional valve performance detection system and method

Abstract

The invention discloses a variable pitch proportional valve performance detection system and method, and the system comprises a voltage regulation and control module which is used for outputting an amplitude-adjustable DC voltage signal to a variable pitch proportional valve; wherein the amplitude of the direct-current voltage signal supports stepped change and step change; the flow detection module is used for maintaining the hydraulic pressure of an inlet of the variable-pitch proportional valve to be stable through a pressure stabilizing valve and collecting hydraulic oil flow data passing through the variable-pitch proportional valve through a flow meter; and the data processing module is used for generating a voltage-flow fitting curve according to the corresponding relationship between the direct-current voltage signal and the hydraulic oil flow data, and identifying the fault type of the variable-pitch proportional valve based on a preset fault criterion library and the voltage-flow fitting curve. According to the method, the problems that voltage-flow dynamic correlation is not established, pressure stability control and dynamic simulation are lacked and only qualitative judgment can be realized in existing detection are solved, and the performance detection precision and the intelligent diagnosis level of the variable-pitch proportional valve are improved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic pitch system performance testing technology, and in particular to a pitch proportional valve performance testing system and method. Background Technology

[0002] In the hydraulic pitch control system of wind turbine generators, the proportional valve, as a core component, functions to precisely control the flow of hydraulic oil via electrical signals (voltage), thereby achieving rapid and accurate adjustment of the blade angle. However, existing technologies still have the following prominent problems regarding the performance testing of this key component: First, the testing strategies deviate from the core characteristics. The core of a pitch proportional valve lies in the dynamic voltage-flow response relationship, but existing solutions mostly focus on static pressure threshold testing or sealing and pressure characteristic testing, failing to establish a correlation analysis system between input voltage and output flow. This testing method cannot effectively identify key faults that directly affect regulation accuracy, such as valve core sticking and insufficient stroke, leading to a disconnect between test conclusions and actual operating performance.

[0003] Secondly, the testing environment and dynamic simulation are insufficient. Proportional valves actually operate under complex conditions of high pressure and continuous regulation, but existing testing equipment lacks effective control over the cleanliness and pressure stability of the hydraulic medium. Impurities in the air source and pressure fluctuations directly interfere with the accuracy of the test results. Furthermore, most tests only use fixed electrical signals, failing to simulate the dynamic flow response characteristics during voltage step changes in pitch control, resulting in a high rate of false fault diagnosis. In addition, some solutions rely on valve replacement for troubleshooting, which is time-consuming and cannot achieve quantitative analysis, leading to low efficiency.

[0004] Third, the level of system integration and intelligence is low. Although existing multi-channel testing systems have parallel testing capabilities, they are complex in structure, costly, and lack integrated data acquisition and processing functions. They can only qualitatively determine whether there is a fault, and cannot quantitatively assess health status indicators such as linearity deviation and response delay. Furthermore, they are difficult to predict performance degradation trends and cannot meet the urgent needs of wind farms for preventive maintenance.

[0005] Therefore, there is an urgent need to provide a technical solution to address the above problems. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a system and method for testing the performance of a pitch proportional valve.

[0007] In a first aspect, the present invention provides a performance testing system for a pitch proportional valve, the technical solution of which is as follows: A voltage regulation module is used to output an adjustable DC voltage signal to the pitch proportional valve; wherein the amplitude of the DC voltage signal supports step-like and step-like changes. The flow detection module is used to maintain the hydraulic pressure at the inlet of the pitch proportional valve through the pressure regulating valve, and to collect the hydraulic oil flow data through the pitch proportional valve through the flow meter. The data processing module is used to generate a voltage-flow fitting curve based on the correspondence between the DC voltage signal and the hydraulic oil flow data, and to identify the fault type of the pitch proportional valve based on a preset fault criterion library and the voltage-flow fitting curve.

[0008] The beneficial effects of the pitch proportional valve performance testing system of the present invention are as follows: The system of this invention solves the problems of existing detection methods that do not establish a dynamic correlation between voltage and flow, lack pressure stability control and dynamic simulation, and can only make qualitative judgments, thereby improving the accuracy of performance testing and the level of intelligent diagnosis of pitch proportional valves.

[0009] Based on the above scheme, the pitch proportional valve performance testing system of the present invention can be further improved as follows.

[0010] In one alternative embodiment, the voltage regulation module is specifically used for: Configure a programmable DC signal source and control the programmable DC signal source to output an adjustable DC voltage signal to the pitch proportional valve; wherein, the DC voltage signal includes: a stepped signal that changes in predetermined steps and a stepped signal that changes abruptly according to a preset amplitude.

[0011] The advantages of adopting the above-mentioned optional methods are: to further realize precise programming control of voltage signals, support stepped static calibration and step dynamic response testing, fully simulate the actual working conditions of pitch control, and meet the dual evaluation requirements of static accuracy and dynamic performance.

[0012] In one alternative approach, the traffic detection module is specifically used for: The hydraulic pressure at the inlet is controlled within a preset fluctuation range by means of the pressure regulating valve connected to the inlet of the pitch proportional valve; The flow rate data of the hydraulic oil passing through the pitch proportional valve is collected by the flow meter connected to the outlet of the pitch proportional valve.

[0013] The advantages of using the above-mentioned optional method are: the hydraulic pressure fluctuation is further stabilized within the preset range by the inlet pressure regulating valve, the influence of pressure interference on flow detection is eliminated, and accurate flow data is collected in conjunction with the outlet flow meter to ensure the accuracy and repeatability of the test results.

[0014] In one alternative approach, the data processing module is specifically used for: Based on multiple time-series amplitude points of the DC voltage signal and the hydraulic oil flow data points corresponding to each time-series amplitude point in the hydraulic oil flow data, the voltage-flow fitting curve is generated through linear regression calculation.

[0015] The advantages of adopting the above optional method are: further linear regression calculation based on the time-series voltage amplitude points and corresponding flow data points to generate voltage-flow fitting curves, quantitatively characterize the mapping relationship between input voltage and output flow, and provide a mathematical model basis for fault feature extraction.

[0016] In one optional approach, the preset fault criterion library includes: linear error threshold conditions and response time threshold conditions corresponding to each fault type; the data processing module is specifically used for: Extract the linear error characteristics and response time characteristics from the voltage-flow fitting curve; The linear error feature and the response time feature are compared with the linear error threshold conditions and response time threshold conditions corresponding to each fault type stored in the preset fault criterion library, respectively. The fault type of the pitch proportional valve is determined based on the comparison results.

[0017] The advantages of adopting the above optional method are: by further utilizing the linear error and response time threshold conditions stored in the preset fault criterion library, the extracted fitting curve feature parameters are automatically compared with the threshold, thereby realizing intelligent identification and classification of fault types and improving diagnostic efficiency and accuracy.

[0018] In one alternative approach, the data processing module is specifically used for: The linear error characteristic is calculated by comparing the maximum deviation between the voltage-flow fitting curve and the ideal linear curve; The response time characteristics are calculated by identifying the following delay of the hydraulic oil flow data to the step signal.

[0019] The advantages of adopting the above optional method are: further calculating the linear error characteristics by comparing the maximum deviation value between the fitted curve and the ideal linear curve, and identifying the response time characteristics of the flow data following the step signal, thereby accurately quantifying the static linear deviation and dynamic response sluggishness of the pitch proportional valve.

[0020] In one alternative approach, the fault types stored in the preset fault criterion library include at least: valve core jamming and valve port blockage.

[0021] The advantages of adopting the above optional method are: further configuring the fault criterion library to include at least two typical faults, valve core jamming and valve port blockage, and setting corresponding characteristic threshold conditions to achieve accurate diagnosis of common mechanical faults of pitch proportional valves, thus meeting the actual needs of on-site operation and maintenance.

[0022] Secondly, the present invention provides a method for testing the performance of a pitch proportional valve, the technical solution of which is as follows: An adjustable DC voltage signal is output to the pitch proportional valve; wherein the amplitude of the DC voltage signal supports both stepped and abrupt changes. The hydraulic pressure at the inlet of the pitch proportional valve is maintained stable by a pressure regulating valve, and the hydraulic oil flow rate data through the pitch proportional valve is collected by a flow meter. A voltage-flow fitting curve is generated based on the correspondence between the DC voltage signal and the hydraulic oil flow data. Based on a preset fault criterion library and the voltage-flow fitting curve, the fault type of the pitch proportional valve is identified.

[0023] The beneficial effects of the pitch proportional valve performance testing method of the present invention are as follows: The method of this invention solves the problems of existing detection methods that do not establish a dynamic correlation between voltage and flow, lack pressure stability control and dynamic simulation, and can only make qualitative judgments, thereby improving the accuracy of performance testing and the level of intelligent diagnosis of pitch proportional valves.

[0024] Thirdly, the technical solution of an electronic device according to the present invention is as follows: It includes a memory, a processor, and a program stored in the memory and running on the processor, wherein the processor executes the program to implement the steps of the pitch proportional valve performance testing method of the present invention.

[0025] Fourthly, the technical solution of a computer-readable storage medium provided by the present invention is as follows: The computer-readable storage medium stores instructions that, when read, cause the computer-readable storage medium to perform the steps of the pitch proportional valve performance testing method of the present invention.

[0026] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0027] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of an embodiment of a pitch proportional valve performance testing system according to the present invention; Figure 2 This is a schematic flowchart of an embodiment of a pitch proportional valve performance testing method according to the present invention. Figure 3 This is a schematic diagram of an embodiment of an electronic device according to the present invention. Detailed Implementation

[0028] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0029] Figure 1 A schematic diagram of an embodiment of a pitch proportional valve performance testing system 100 provided by the present invention is shown. Figure 1 As shown, the pitch proportional valve performance testing system 100 includes: The voltage regulation module 101 is used to output an adjustable DC voltage signal to the pitch proportional valve; wherein the amplitude of the DC voltage signal supports step-like and step-like changes.

[0030] "Amplitude adjustable" means that the DC voltage signal value can be changed continuously or in stages within a certain range. For example, when testing the pitch proportional valve of a wind turbine (type A), a programmable DC signal source can output any desired voltage value between 5V and 10V to test the performance of the proportional valve under different drive levels. A DC voltage signal refers to a voltage signal whose polarity (positive or negative) and voltage value do not change with time. For example, a programmable DC signal source provides a constant positive voltage to the solenoid coil of the pitch proportional valve as a control command. A pitch proportional valve is a control valve installed in the hydraulic pitch system of a wind turbine generator set that can proportionally adjust the output hydraulic oil flow rate according to the input electrical signal. For example, the hydraulic valve used to control the blade angle adjustment in wind turbine A changes its opening degree linearly with the magnitude of the input voltage. A stepped change refers to a signal amplitude that increases or decreases gradually in a series of discrete, fixed increments or steps. For example, a programmable DC signal source outputs 5.1V, 5.2V, 5.3V, and up to 10.0V in 0.1V steps, simulating the input of a proportional valve during slow adjustment. A jump change refers to a signal amplitude that jumps instantaneously from one level to another in a very short time. For example, the output voltage of a programmable DC signal source suddenly jumps from a stable 3.0V to 7.0V to test the dynamic response capability of a proportional valve during rapid blade pitch changes.

[0031] The flow detection module 102 is used to maintain the hydraulic pressure at the inlet of the pitch proportional valve through the pressure regulating valve, and to collect the hydraulic oil flow data through the pitch proportional valve through the flow meter.

[0032] A pressure regulating valve refers to a hydraulic control valve that automatically adjusts to maintain the fluid pressure at its outlet near a set value. For example, a valve installed in the hydraulic circuit of a testing platform constantly controls the hydraulic oil pressure supplied to the pitch proportional valve at 120 bar, unaffected by fluctuations in the upstream pump source. A flow meter is an instrument used to measure the volume of fluid passing through a pipeline per unit time. For example, an electromagnetic flow meter installed on the outlet pipe of the pitch proportional valve measures and outputs the hydraulic oil flow rate after adjustment by the proportional valve in real time, in units of L / min. Hydraulic oil flow data refers to a numerical sequence collected by the flow meter reflecting the volume of hydraulic oil flowing through the pitch proportional valve per unit time. For example, when the input voltage is 6.0V, the data collected by the electromagnetic flow meter might be a series of real-time flow values ​​such as 12.5 L / min, 12.4 L / min, and 12.6 L / min.

[0033] The data processing module 103 is used to generate a voltage-flow fitting curve based on the correspondence between the DC voltage signal and the hydraulic oil flow data, and to identify the fault type of the pitch proportional valve based on a preset fault criterion library and the voltage-flow fitting curve.

[0034] The correspondence relationship refers to the matching relationship between the input signal and the output response, which is synchronized in time and correlated in value. For example, the data processing module records that the output voltage is 5.5V at a certain moment, and at the same moment, the stable flow rate is 10.8 L / min. These two sets of data constitute a pair of corresponding data points for voltage and flow. The voltage-flow fitting curve refers to a curve that characterizes the functional relationship between a series of voltage signals and hydraulic oil flow rate data corresponding to corresponding data points, drawn using mathematical methods such as linear regression. For example, different voltage points and their corresponding average flow rate points are marked on a coordinate system, and a straight line that best reflects the overall trend is fitted. The preset fault judgment criterion library refers to a database pre-established in the data processing module, which stores the characteristic parameter judgment criteria or threshold conditions corresponding to various fault types. For example, this database may be set to indicate the risk of valve core jamming if the flow fluctuation amplitude in the low voltage range exceeds 0.5 L / min. Fault type refers to the specific type of failure or performance degradation of the pitch proportional valve as classified according to the performance test results; for example, by analyzing the test data, the system may identify fault types including valve core jamming or valve port blockage.

[0035] The technical solution of this embodiment solves the problems of existing detection methods that do not establish a dynamic correlation between voltage and flow, lack pressure stability control and dynamic simulation, and can only make qualitative judgments, thereby improving the accuracy of performance detection and the level of intelligent diagnosis of pitch proportional valves.

[0036] In one alternative embodiment, the voltage regulation module 101 is specifically used for: Configure a programmable DC signal source and control the programmable DC signal source to output an adjustable DC voltage signal to the pitch proportional valve; wherein, the DC voltage signal includes: a stepped signal that changes in predetermined steps and a stepped signal that changes abruptly according to a preset amplitude.

[0037] In this context, a programmable DC signal source refers to an electronic device capable of outputting DC voltages with specified amplitudes, waveforms, and change sequences, controlled by a program. For example, a signal generator used on a testing platform can be programmed to automatically output pre-set stepped and abrupt voltage test sequences. A predetermined step refers to a fixed increment value pre-set for each voltage change in a stepped variation; for example, setting the step value for a stepped test in the testing program to 0.1V means that the voltage increases or decreases by 0.1V with each change. A stepped signal refers to an electrical signal whose amplitude changes progressively according to a predetermined step; for example, a complete test signal sequence output by a programmable DC signal source might have voltage values ​​of 5.0V, 5.1V, 5.2V, and 5.3V, forming a rising stepped waveform. A preset amplitude refers to a target voltage value for a signal jump in a abrupt variation; for example, in a step response test, the program sets the voltage to jump from a baseline of 3.0V to a target value of 8.0V, and this 8.0V is the preset amplitude. A step signal is an electrical signal whose amplitude changes instantaneously by a preset value; for example, a voltage waveform output by a programmable DC signal source that jumps from 3.0V to 8.0V at a certain moment and remains there for a period of time.

[0038] Among the above-mentioned optional methods, precise programming control of voltage signals can be further realized, supporting stepped static calibration and step dynamic response testing, fully simulating the actual working conditions of the pitch process, and meeting the dual evaluation requirements of static accuracy and dynamic performance.

[0039] In an alternative embodiment, the flow detection module 102 is specifically used for: The hydraulic pressure at the inlet of the pitch proportional valve is controlled within a preset fluctuation range by the pressure regulating valve connected to the inlet of the pitch proportional valve.

[0040] The preset fluctuation range refers to the allowable deviation range set for hydraulic pressure stability. For example, the pressure regulating valve is set to maintain the inlet pressure of the pitch proportional valve at 120 bar, and the fluctuation does not exceed ±2%, that is, the pressure needs to be maintained between 117.6 bar and 122.4 bar.

[0041] The flow rate data of the hydraulic oil passing through the pitch proportional valve is collected by the flow meter connected to the outlet of the pitch proportional valve.

[0042] In the above-mentioned optional methods, the hydraulic pressure fluctuation is further stabilized within a preset range by the inlet pressure regulating valve, eliminating the influence of pressure interference on flow detection, and collecting accurate flow data in conjunction with the outlet flow meter to ensure the accuracy and repeatability of the test results.

[0043] In an alternative embodiment, the data processing module 103 is specifically used for: Based on multiple time-series amplitude points of the DC voltage signal and the hydraulic oil flow data points corresponding to each time-series amplitude point in the hydraulic oil flow data, the voltage-flow fitting curve is generated through linear regression calculation.

[0044] Among them, the time-series amplitude points refer to a series of instantaneous amplitude data points of the DC voltage signal acquired in chronological order; for example, during the test, the voltage value is recorded every 100 milliseconds to obtain a series of voltage data sequences ordered by time. The hydraulic oil flow rate data points refer to the hydraulic oil flow rate values ​​acquired at the same time or within the corresponding time period as each time-series amplitude point; for example, synchronized with the voltage time-series points, the flow rate is acquired every 100 milliseconds to obtain the corresponding flow rate data sequence.

[0045] It should be noted that the linear regression method in this embodiment is used to find a straight line that minimizes the overall deviation between the line and a set of two-dimensional data points.

[0046] In the above-mentioned optional methods, a linear regression calculation is further performed based on the time-series voltage amplitude points and the corresponding flow data points to generate a voltage-flow fitting curve, which quantitatively describes the mapping relationship between input voltage and output flow, and provides a mathematical model basis for fault feature extraction.

[0047] In one optional embodiment, the preset fault criterion library includes: linear error threshold conditions and response time threshold conditions corresponding to each fault type; the data processing module 103 is specifically used for: Extract the linear error characteristics and response time characteristics from the voltage-flow fitting curve.

[0048] Linearity error characteristics refer to one or more parameters used to quantify the degree to which the actual voltage-flow relationship of the pitch proportional valve deviates from the ideal linearity; for example, the percentage of linearity calculated by fitting a curve, or the maximum deviation between the measured curve and the ideal straight line. Response time characteristics refer to one or more time parameters used to quantify how quickly the output flow of the pitch proportional valve follows a step change in input voltage; for example, the time it takes for the output flow to rise from its initial value to 90% of its final stable value after a step change in input voltage.

[0049] The linear error feature and the response time feature are compared with the linear error threshold conditions and response time threshold conditions corresponding to each fault type stored in the preset fault criterion library.

[0050] The linearity error threshold condition refers to the boundary value or range of linearity error characteristics set in the preset fault criterion library to determine whether the linearity of the proportional valve is abnormal. For example, the criterion library may set that if the linearity error exceeds ±3% of the full-scale flow rate, the linearity is unqualified. The response time threshold condition refers to the boundary value of the response time characteristics set in the preset fault criterion library to determine whether the response speed of the proportional valve is abnormal. For example, the criterion library may set that if the time required for the flow rate to reach 90% of the stable value for a step change from 1V to 4V exceeds 100 milliseconds, the response is too slow.

[0051] The fault type of the pitch proportional valve is determined based on the comparison results.

[0052] The comparison result refers to the qualitative or quantitative conclusion drawn after comparing the calculated feature parameters with the threshold conditions in the fault criterion library; for example, if the calculated response time is 120ms, it is compared with the threshold condition in the criterion library that a response delay of more than 100ms is considered to be excessive, and the result is that the threshold is exceeded.

[0053] In the above-mentioned optional methods, the linear error and response time threshold conditions stored in the preset fault criterion library are further utilized to automatically compare the extracted fitting curve feature parameters with the thresholds, thereby realizing intelligent identification and classification of fault types and improving diagnostic efficiency and accuracy.

[0054] In an alternative embodiment, the data processing module 103 is specifically used for: The linear error characteristic is calculated by comparing the maximum deviation between the voltage-flow fitting curve and the ideal linear curve.

[0055] The ideal linear curve refers to a straight line in which the flow output of the pitch proportional valve is strictly proportional to the voltage input under ideal conditions. For example, assuming the proportional valve is perfectly ideal, it outputs 10 L / min at 5V and 20 L / min at 10V; the straight line connecting these two points is the ideal linear curve. The maximum deviation value refers to the maximum absolute value of the vertical distance (i.e., the flow deviation) between the actual measured voltage-flow fitting curve and the ideal linear curve at all voltage points. For example, at the 7V test point, the actual flow rate is 14.8 L / min, while the corresponding value on the ideal linear curve is 15.0 L / min, resulting in a deviation of -0.2 L / min. The maximum absolute value of the deviation found after traversing all points might be 0.3 L / min.

[0056] The response time characteristics are calculated by identifying the following delay of the hydraulic oil flow data to the step signal.

[0057] The following delay refers to the phenomenon that the change in output, i.e., flow rate, lags behind the change in input, i.e., voltage step change, in time. The length of the lag time is called the delay time. For example, if the voltage jumps from 3V to 7V at a certain moment, the flow rate will only start to rise significantly after 50 milliseconds. This 50 milliseconds is part of the following delay.

[0058] In the above-mentioned optional methods, the linear error characteristics are further calculated by comparing the maximum deviation value between the fitted curve and the ideal linear curve, and the response time characteristics are calculated by identifying the following delay of the flow data to the step signal, so as to accurately quantify the static linear deviation and dynamic response sluggishness of the pitch proportional valve.

[0059] In one alternative approach, the fault types stored in the preset fault criterion library include at least: valve core jamming and valve port blockage.

[0060] Valve core jamming refers to a malfunction in the pitch proportional valve where the valve core, due to contamination, wear, or deformation, experiences excessive resistance or becomes stuck during movement, preventing it from accurately and smoothly displacing according to electrical signals. For example, during testing, irregular fluctuations or values ​​far below expectations in the low-voltage range may indicate valve core jamming within a small opening range. Valve port blockage refers to a malfunction where the fluid passage or throttling orifice of the pitch proportional valve is partially or completely blocked by contaminants in the oil, resulting in limited flow. For example, during testing, it may be observed that in the high-voltage range, the output flow reaches a plateau and then stops increasing with voltage, indicating flow saturation, which could be a sign of partial valve port blockage.

[0061] In the above-mentioned optional methods, the fault criterion library is further configured to include at least two typical faults: valve core jamming and valve port blockage. Corresponding characteristic threshold conditions are set in a targeted manner to achieve accurate diagnosis of common mechanical faults of pitch proportional valves and meet the actual needs of on-site operation and maintenance.

[0062] In this embodiment, it should be noted that the muffler is connected to the hydraulic circuit of the pitch proportional valve to absorb pressure pulsations and hydraulic shocks generated during valve operation. By attenuating these pressure fluctuations, the muffler stabilizes the hydraulic oil flow through the pitch proportional valve. This stabilizing effect helps reduce flow measurement noise and improves the accuracy and reliability of pitch proportional valve performance test data.

[0063] Figure 2 A schematic flowchart of an embodiment of a pitch proportional valve performance testing method provided by the present invention is shown. Figure 2 As shown, it includes the following steps: S1. Output an adjustable DC voltage signal to the pitch proportional valve; wherein the amplitude of the DC voltage signal supports both stepped and abrupt changes. S2. The hydraulic pressure at the inlet of the pitch proportional valve is kept stable by a pressure regulating valve, and the hydraulic oil flow data through the pitch proportional valve is collected by a flow meter. S3. Generate a voltage-flow fitting curve based on the correspondence between the DC voltage signal and the hydraulic oil flow data, and identify the fault type of the pitch proportional valve based on the preset fault criterion library and the voltage-flow fitting curve.

[0064] In one alternative approach, S1 specifically includes: Configure a programmable DC signal source and control the programmable DC signal source to output an adjustable DC voltage signal to the pitch proportional valve; wherein, the DC voltage signal includes: a stepped signal that changes in predetermined steps and a stepped signal that changes abruptly according to a preset amplitude.

[0065] In one alternative approach, S2 specifically includes: The hydraulic pressure at the inlet is controlled within a preset fluctuation range by means of the pressure regulating valve connected to the inlet of the pitch proportional valve; The flow rate data of the hydraulic oil passing through the pitch proportional valve is collected by the flow meter connected to the outlet of the pitch proportional valve.

[0066] In one optional embodiment, the step of generating a voltage-flow fitting curve based on the correspondence between the DC voltage signal and the hydraulic oil flow data includes: Based on multiple time-series amplitude points of the DC voltage signal and the hydraulic oil flow data points corresponding to each time-series amplitude point in the hydraulic oil flow data, the voltage-flow fitting curve is generated through linear regression calculation.

[0067] In one optional approach, the preset fault criterion library includes: a linear error threshold condition and a response time threshold condition corresponding to each fault type; the step of identifying the fault type of the pitch proportional valve based on the preset fault criterion library and the voltage-flow fitting curve includes: Extract the linear error characteristics and response time characteristics from the voltage-flow fitting curve; The linear error feature and the response time feature are compared with the linear error threshold conditions and response time threshold conditions corresponding to each fault type stored in the preset fault criterion library, respectively. The fault type of the pitch proportional valve is determined based on the comparison results.

[0068] In one alternative approach, the step of extracting the linear error features and response time features from the voltage-flow fitting curve includes: The linear error characteristic is calculated by comparing the maximum deviation between the voltage-flow fitting curve and the ideal linear curve; The response time characteristics are calculated by identifying the following delay of the hydraulic oil flow data to the step signal.

[0069] In one alternative approach, the fault types stored in the preset fault criterion library include at least: valve core jamming and valve port blockage.

[0070] It should be noted that the beneficial effects of the pitch proportional valve performance testing method provided in the above embodiments are the same as those of the pitch proportional valve performance testing system 100 described above, and will not be repeated here. Furthermore, the method and system embodiments provided in the above embodiments belong to the same concept, and their specific implementation process can be found in the system embodiments, which will not be repeated here.

[0071] The pitch proportional valve performance testing system 100 of the present invention can be a computer program (including program code) running on a computer device. For example, the pitch proportional valve performance testing system 100 of the present invention is an application software that can be used to execute the corresponding steps in the pitch proportional valve performance testing method of the present invention.

[0072] In some embodiments, the pitch proportional valve performance testing system 100 of the present invention can be implemented in a combination of hardware and software. As an example, the pitch proportional valve performance testing system 100 of the present invention can be a processor in the form of a hardware decoding processor, which is programmed to execute the pitch proportional valve performance testing method of the present invention. For example, the processor in the form of a hardware decoding processor can be one or more application specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), field-programmable gate arrays (FPGAs), or other electronic components.

[0073] The modules described in the embodiments of this invention can be implemented in software or hardware. The names of the modules are not, in some cases, limiting the scope of the module itself.

[0074] An electronic device according to an embodiment of the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements any of the above-mentioned pitch proportional valve performance detection methods. That is, an electronic device according to an embodiment of the present invention may include, but is not limited to: a processor and a memory; the memory is used to store the computer program; the processor is used to execute the pitch proportional valve performance detection method shown in any embodiment of the present invention by calling the computer program.

[0075] In one alternative embodiment, an electronic device is provided, such as Figure 3 As shown, Figure 3 The illustrated electronic device 4000 includes a processor 4001 and a memory 4003. The processor 4001 and the memory 4003 are connected, for example, via a bus 4002. Optionally, the electronic device 4000 may further include a transceiver 4004, which can be used for data interaction between the electronic device and other electronic devices, such as sending and / or receiving data. It should be noted that in practical applications, the transceiver 4004 is not limited to one type, and the structure of the electronic device 4000 does not constitute a limitation on the embodiments of the present invention.

[0076] Processor 4001 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this invention. Processor 4001 may also be a combination that implements computational functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0077] Bus 4002 may include a path for transmitting information between the aforementioned components. Bus 4002 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Bus 4002 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 3 The bus 4002 is represented by only one thick line, but this does not mean that there is only one bus or one type of bus.

[0078] The memory 4003 may be ROM (Read Only Memory) or other types of static storage devices capable of storing static information and instructions, RAM (Random Access Memory) or other types of dynamic storage devices capable of storing information and instructions, or EEPROM (Electrically Erasable Programmable Read Only Memory), CD-ROM (Compact Disc Read Only Memory) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto.

[0079] The memory 4003 stores application code (computer program) for executing the present invention, and its execution is controlled by the processor 4001. The processor 4001 executes the application code stored in the memory 4003 to implement the content shown in the foregoing method embodiments.

[0080] Among them, electronic devices can also be terminal devices. A terminal device can be any terminal device that can install applications and access web pages through applications, including at least one of smartphones, tablets, laptops, desktop computers, smart speakers, smartwatches, smart TVs, and smart in-vehicle devices.

[0081] It should be noted that, Figure 3 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0082] An embodiment of the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements any of the above-described pitch proportional valve performance testing methods.

[0083] Alternatively, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a compact disc read-only memory (CD-ROM), magnetic tape, a floppy disk, and an optical data storage device, etc.

[0084] In an exemplary embodiment, a computer program product or computer program is also provided, which includes computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the electronic device to perform the aforementioned pitch proportional valve performance detection method.

[0085] Computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0086] It should be understood that the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of methods and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0087] The computer-readable storage medium provided in this invention can be, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0088] The aforementioned computer-readable storage medium carries one or more programs, which, when executed by the electronic device, cause the electronic device to perform the method shown in the above embodiments.

[0089] The above description is merely a preferred embodiment of the present invention and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of disclosure in this invention is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-disclosed concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this invention.

[0090] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and represent a limitation on a specific order or sequence. Where appropriate, the order of use for similar objects can be interchanged so that the embodiments of this application described herein can be implemented in an order other than that shown or described.

[0091] Those skilled in the art will recognize that this invention can be implemented as a system, method, or computer program product. Therefore, this invention can be specifically implemented in the following forms: it can be entirely hardware, entirely software (including firmware, resident software, microcode, etc.), or a combination of hardware and software, generally referred to herein as a "circuit," "module," or "system." Furthermore, in some embodiments, this invention can also be implemented as a computer program product contained in one or more computer-readable media, which includes computer-readable program code.

[0092] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A variable pitch proportional valve performance detection system, characterized by, The method comprises the steps of: a voltage regulation module is configured to output a direct current voltage signal with adjustable amplitude to a variable pitch proportional valve; wherein the amplitude of the direct current voltage signal supports stepwise change and step change; a flow detection module is configured to maintain the hydraulic pressure at the inlet of the variable pitch proportional valve stable through a pressure stabilizing valve, and collect the hydraulic oil flow data through the variable pitch proportional valve through a flow meter; a data processing module is configured to generate a voltage-flow fitting curve according to the corresponding relationship between the direct current voltage signal and the hydraulic oil flow data, and identify the fault type of the variable pitch proportional valve based on a preset fault criterion library and the voltage-flow fitting curve.

2. The variable pitch proportional valve performance detection system of claim 1, wherein, The voltage regulation module is specifically configured to: configure a programmable direct current signal source, and control the programmable direct current signal source to output the direct current voltage signal with adjustable amplitude to the variable pitch proportional valve; wherein the direct current voltage signal comprises a step signal with predetermined step change and a step signal with preset amplitude mutation.

3. The variable pitch proportional valve performance detection system of claim 1, wherein, The flow detection module is specifically configured to: control the hydraulic pressure at the inlet of the variable pitch proportional valve within a preset fluctuation range through the pressure stabilizing valve connected to the inlet of the variable pitch proportional valve; collect the hydraulic oil flow data through the variable pitch proportional valve through the flow meter connected to the outlet of the variable pitch proportional valve.

4. The variable pitch proportional valve performance detection system of claim 2, wherein, The data processing module is specifically configured to: generate the voltage-flow fitting curve through linear regression calculation according to a plurality of time sequence amplitude points of the direct current voltage signal and a plurality of hydraulic oil flow data points corresponding to each time sequence amplitude point in the hydraulic oil flow data.

5. The variable pitch proportional valve performance detection system of claim 4, wherein, The preset fault criterion library comprises linear error threshold conditions and response time threshold conditions corresponding to each fault type; the data processing module is specifically configured to: extract linear error features and response time features in the voltage-flow fitting curve; compare the linear error features and the response time features with the linear error threshold conditions and the response time threshold conditions corresponding to each fault type stored in the preset fault criterion library, respectively; determine the fault type of the variable pitch proportional valve according to the comparison result.

6. The variable pitch proportional valve performance detection system of claim 5, wherein, The data processing module is specifically configured to: calculate the linear error features by comparing the maximum deviation value of the voltage-flow fitting curve and an ideal linear curve; calculate the response time features by identifying the following delay of the hydraulic oil flow data to the step signal.

7. The pitch proportional valve performance detection system of any one of claims 1 to 6, wherein The fault types stored in the preset fault criterion library at least include valve core sticking and valve port blockage.

8. A method of detecting performance of a pitch ratio valve, characterized by, The method comprises the steps of: outputting a direct current voltage signal with adjustable amplitude to a variable pitch proportional valve; wherein the amplitude of the direct current voltage signal supports stepwise change and step change; maintaining the hydraulic pressure at the inlet of the variable pitch proportional valve stable through a pressure stabilizing valve, and collecting the hydraulic oil flow data through the variable pitch proportional valve through a flow meter; generating a voltage-flow fitting curve according to the corresponding relationship between the direct current voltage signal and the hydraulic oil flow data, and identifying the fault type of the variable pitch proportional valve based on a preset fault criterion library and the voltage-flow fitting curve.

9. An electronic device, comprising: The electronic device includes a processor coupled with a memory having at least one computer program stored therein, the at least one computer program being loaded and executed by the processor to enable the electronic device to implement the variable pitch proportional valve performance detection method of claim 8.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium has at least one computer program stored therein, the at least one computer program being executed by the processor to implement the variable pitch proportional valve performance detection method of claim 8.

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