Transition state multi-stage sampling test method for action response time of electromagnetic valve

Abstract

The invention relates to the technical field of electromechanical control testing, in particular to an electromagnetic valve action response time transition state multi-section sampling testing method, which comprises the following steps of S1, monitoring electromagnetic valve driving current in real time, and generating an initial trigger signal; s2, generating a first-stage sub-trigger signal and a second-stage sub-trigger signal; s3, the action process of the electromagnetic valve is divided into a delay stage, an acceleration stage and a stable stage, and synchronous sampling is carried out on each stage; s4, extracting an electromagnetic starting point from the sampling data in the delay stage, and extracting a mechanical action point from the sampling data in the acceleration stage; s5, calculating mechanical delay time and mechanical motion time; and S6, accumulating to obtain the total action response time of the electromagnetic valve. According to the invention, through a multi-stage triggering and synchronous sampling mechanism, accurate extraction and accumulation calculation of response time of each stage in the whole action process of the electromagnetic valve are realized, and the accuracy and reliability of response characteristic testing are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electromechanical control testing, and particularly to a multi-segment sampling testing method for the transitional state of the action response time of a solenoid valve. Background Art

[0002] As an electromechanical conversion unit, the solenoid valve is widely used in the fields of hydraulic pressure, pneumatic and internal combustion engine control. Its response characteristics directly affect the dynamic performance and control accuracy of the entire system. Especially in high-speed and high-precision control systems, the response time of the solenoid valve (i.e., the entire process duration from the change of the driving signal to the completion of the valve core action) is one of the core indicators for evaluating its performance. Currently, common response time testing methods mostly rely on single-point triggering or single-variable measurement means, which cannot refine the dynamic correlation between electromagnetic drive, mechanical delay, and the valve core action process, and have a low recognition accuracy for the transitional state, making it difficult to comprehensively depict the complex response process inside the solenoid valve.

[0003] Existing testing methods have significant deficiencies in the segmented recognition of the response time, lacking a detailed division of the transitional characteristics between the electromagnetic stage and the mechanical stage, and being easily affected by noise interference, resulting in triggering misjudgments and affecting the stability and repeatability of the testing. Therefore, there is an urgent need for a multi-segment sampling testing method for the transitional state of the action response time of a solenoid valve to solve the above problems. Summary of the Invention

[0004] Based on the above purposes, the present invention provides a multi-segment sampling testing method for the transitional state of the action response time of a solenoid valve.

[0005] A multi-segment sampling testing method for the transitional state of the action response time of a solenoid valve includes the following steps: S1: Monitor the driving current of the solenoid valve in real time. When the current change rate first exceeds the dynamic threshold and the continuous duration is greater than the preset debounce time window, generate an initial trigger signal; S2: Based on the initial trigger signal, start high-speed sampling, and calculate the second derivative of the driving current in real time. When the second derivative has a positive zero-crossing point, generate a first-level sub-trigger signal, and when it has a negative zero-crossing point, generate a second-level sub-trigger signal; S3: According to the initial trigger signal, the first-level sub-trigger signal, and the second-level sub-trigger signal, divide the action process of the solenoid valve into a delay stage, an acceleration stage, and a stable stage, and synchronously sample the coil current and the valve core displacement signal in each stage; S4: Extract the time point when the current rises to 10% of the rated value from the sampling data of the delay stage as the electromagnetic starting point, and extract the time point corresponding to the maximum value of the displacement change rate from the sampling data of the acceleration stage as the mechanical action point; S5: Calculate the mechanical delay time based on the time difference between the electromagnetic starting point and the mechanical action point, and define the time difference from the mechanical action point to when the displacement reaches 90% of the rated stroke as the mechanical movement time; S6: Define the time difference from the starting point of the delay stage to the electromagnetic starting point as the electromagnetic delay time, and accumulate the electromagnetic delay time, the mechanical delay time, and the mechanical movement time to obtain the total action response time of the solenoid valve.

[0006] Optionally, S1 specifically includes: S11: Collect the current signal of the solenoid valve drive coil in real time through a Hall current sensor, and convert the collected current signal into a digital signal through an analog-to-digital converter; S12: Perform a derivative operation on the digitized current signal at a fixed period to obtain the current change rate, and compare it with a preset dynamic threshold in real time. When the current change rate first exceeds the dynamic threshold, start the timer to start timing; S13: The timer continuously times and determines in real time whether the current change rate is always greater than the dynamic threshold. When the cumulative timing duration of the timer reaches the debounce time window of 10 ms, an initial trigger signal will be generated.

[0007] Optionally, S12 specifically includes: S121: Collect continuous current signal values at a fixed sampling period to obtain the current values of two adjacent sampling points; S122: Use the difference method to calculate the difference between the current values of two adjacent sampling points and divide it by the corresponding sampling period to obtain the value of the current change rate. The calculation formula is: , where is the current change rate; and respectively represent the th and the th sampling point current values;

[0008] Optionally, S2 specifically includes: S21: Based on the initial trigger signal, start high-speed data acquisition and continuously collect the solenoid valve drive current values at a fixed high-speed sampling period; S22: Perform a numerical difference operation on the continuous current signal. By performing difference processing on the current values of every three adjacent sampling points, obtain the second derivative of the current. The calculation formula is: , where is the second derivative of the current; , , are respectively the th, th, and a current sampling value; is a fixed sampling period; S23: Monitor the second derivative of the current in real time. When its value changes from negative to positive instantaneously, record it as the positive zero crossing and generate a first-level sub-trigger signal; when its value changes from positive to negative instantaneously, record it as the negative zero crossing and generate a second-level sub-trigger signal.

[0009] Optionally, the S3 specifically includes: S31: Set the time point corresponding to the initial trigger signal as the starting reference point of the solenoid valve action process, and record it as time point ; S32: When detecting the generation of the first-level sub-trigger signal, record the corresponding time point as , and define the time interval as the delay stage; S33: When detecting the generation of the second-level sub-trigger signal, record the corresponding time point as , and define the time interval as the acceleration stage; S34: Define the time interval as the stable stage, where is the sampling termination time; S35: In the entire time interval, use a unified time reference for the coil current and the spool displacement signal. Connect the current sensor and the displacement sensor respectively using synchronous acquisition channels, and set a unified synchronous sampling period , to ensure that the sampling points have time consistency in each stage.

[0010] Optionally, the S4 specifically includes: S41: In the acceleration stage, synchronously acquire continuous spool displacement signals with the synchronous sampling period , and obtain the displacement value corresponding to each sampling point; S42: Perform a difference operation on the displacement values of two adjacent sampling points continuously to calculate the displacement change rate; S43: Compare all the calculated displacement change rates in the acceleration stage point by point, identify the sampling point corresponding to the maximum value of the displacement change rate, and record the time corresponding to this sampling point as the mechanical action point.

[0011] Optionally, the calculation formula for the displacement change rate is: , where represents the spool displacement change rate; and are the spool displacement values of the th and the th sampling points respectively; is the synchronous sampling period.

[0012] Optionally, the S5 specifically includes: S51: Mark the time point corresponding to the current rising to 10% of the rated value in the sampling data during the delay phase as the electromagnetic starting point; S52: Mark the time point corresponding to the maximum value of the displacement change rate during the acceleration phase as the mechanical action point; S53: Taking a unified time reference, use the time difference between the mechanical action point and the electromagnetic starting point as the mechanical delay time. Find the corresponding sampling index positions of the two through the unified sampling time series, and use the sampling steps and sampling period between them for time difference conversion to obtain the final value of the mechanical delay time.

[0013] Optionally, the S53 specifically includes: S531: Record the sampling index numbers of the electromagnetic starting point and the mechanical action point in the unified sampling sequence respectively. Let the index corresponding to the electromagnetic starting point be and the index corresponding to the mechanical action point be ; S532: Calculate the difference between the two index numbers to obtain the sampling step difference , that is: ; S533: Multiply the sampling step difference by the synchronous sampling period to obtain the mechanical delay time , and the formula is: .

[0014] Optionally, the S6 specifically includes: S61: Record the electromagnetic starting point time corresponding to the current rising to 10% of the rated value during the delay phase as ; S62: Calculate the time difference between the starting point of the delay phase and the electromagnetic starting point, and define this time difference as the electromagnetic delay time ; S63: Define the time difference from the mechanical action point to the displacement reaching 90% of the rated stroke as the mechanical movement time, denoted as ; S64: Accumulate the electromagnetic delay time , the mechanical delay time and the mechanical movement time in sequence to obtain the total action response time of the solenoid valve .

[0015] Advantages of the present invention: In the present invention, by adopting a dynamic threshold determination combined with a fixed sampling period strategy, an initial trigger signal can be accurately generated at the initial stage of the driving current change, and the positive and negative zero-crossing points are identified by real-time calculation of the second derivative of the current, thereby dividing the solenoid valve operation process into a delay stage, an acceleration stage, and a stable stage, achieving high-precision segmented identification and synchronous data acquisition throughout the process, and effectively solving the problems of fuzzy stage division and asynchronous signal acquisition in traditional methods.

[0016] In the present invention, by extracting each key point item by item and calculating the index difference, the electromagnetic delay time, the mechanical delay time, and the mechanical movement time can be obtained respectively, and the total action response time of the solenoid valve is accumulated and output under a unified time reference, ensuring the accuracy, traceability, and repeatability of the test data in the time domain, and significantly improving the resolution ability of the response performance evaluation. Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only those of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 Schematic diagram of the multi-segment sampling test method for the transition state of the solenoid valve action response time in the embodiment of the present invention; Figure 2 Schematic diagram of the process for obtaining the mechanical delay time in the embodiment of the present invention. Detailed Embodiments

[0019] The present invention will be described in detail below in conjunction with the drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, the drawings are only for more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0020] It should be pointed out that in the specification, when referring to "an embodiment", "embodiments", "exemplary embodiments", "some embodiments", etc., it indicates that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. In addition, when combining embodiments to describe specific features, structures, or characteristics, implementing such features, structures, or characteristics in combination with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the relevant art.

[0021] Generally, terms can be understood at least in part from their use in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or property in a singular sense, or can be used to describe a combination of features, structures, or properties in a plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but rather can alternatively, depending at least in part on the context, allow for the presence of other factors that may not be explicitly described.

[0022] As Figure 1 - Figure 2 shown, a multi-segment sampling test method for the transition state of the solenoid valve action response time includes the following steps: S1: Monitor the solenoid valve drive current in real time. When the current change rate first exceeds the dynamic threshold and the duration is greater than the preset debounce time window, generate an initial trigger signal; S2: Based on the initial trigger signal, start high-speed sampling, and calculate the second derivative of the drive current in real time. When the second derivative has a positive zero crossing, generate a first-level sub-trigger signal, and when it has a negative zero crossing, generate a second-level sub-trigger signal; S3: According to the initial trigger signal, the first-level sub-trigger signal, and the second-level sub-trigger signal, divide the solenoid valve action process into a delay stage, an acceleration stage, and a stable stage, and synchronously sample the coil current and the spool displacement signal within each stage; S4: For the sampling data in the delay stage, extract the time point when the current rises to 10% of the rated value as the electromagnetic start point, and for the sampling data in the acceleration stage, extract the time point corresponding to the maximum value of the displacement change rate as the mechanical action point; S5: Calculate the mechanical delay time according to the time difference between the electromagnetic start point and the mechanical action point, and define the time difference from the mechanical action point to when the displacement reaches 90% of the rated stroke as the mechanical movement time; S6: Define the time difference from the starting point of the delay stage to the electromagnetic start point as the electromagnetic delay time, and accumulate the electromagnetic delay time, the mechanical delay time, and the mechanical movement time to obtain the total action response time of the solenoid valve.

[0023] S1 specifically includes: S11: Real-time collect the current signal of the solenoid valve drive coil through a Hall current sensor, and convert the collected current signal into a digital signal through an analog-to-digital converter; S12: Perform a derivative operation on the digitized current signal at a fixed period to obtain the current change rate, and compare it with the preset dynamic threshold in real time. When the current change rate first exceeds the dynamic threshold, start a timer to start timing; S13: The timer continuously measures time and determines in real time whether the current change rate is always greater than the dynamic threshold. When the cumulative timing duration of the timer reaches the 10 ms debounce time window, an initial trigger signal will be generated. Through the clear current acquisition and calculation method, the above steps ensure the accurate monitoring of the starting condition of the solenoid valve action, effectively avoid false triggering caused by noise interference, and improve the accuracy and reliability of the test results.

[0024] S12 specifically includes: S121: Collect continuous current signal values at a fixed sampling period to obtain the current values of two adjacent sampling points. S122: Use the difference method to calculate the difference between the current values of two adjacent sampling points and divide it by the corresponding sampling period to obtain the value of the current change rate. The calculation formula is: , where is the current change rate, with the unit of amperes per second; and respectively represent the current values of the th and th sampling points, both with the unit of amperes; is the fixed sampling period, with the unit of seconds.

[0025] S2 specifically includes: S21: Based on the initial trigger signal, start high-speed data acquisition and continuously collect the solenoid valve drive current values at a fixed high-speed sampling period. S22: Perform a numerical difference operation on the continuous current signal. By performing a difference process on the current values of every three adjacent sampling points, obtain the second derivative of the current (i.e., acceleration). The calculation formula is: , where is the second derivative of the current, with the unit of amperes per square second; , , are respectively the th, rd, and th current sampling values of continuous sampling, both with the unit of amperes; is the fixed sampling period, with the unit of seconds; S23: Monitor the second derivative of the current in real time. When its value changes from negative to positive instantaneously, record it as the positive zero crossing and generate a first-level sub-trigger signal; when its value changes from positive to negative instantaneously, record it as the negative zero crossing and generate a second-level sub-trigger signal. Through the clear high-speed sampling and difference calculation method, the above steps realize the monitoring of the second derivative of the current and the accurate identification of positive and negative zero crossings, thereby accurately dividing the solenoid valve action stage and providing a reliable trigger basis for subsequent data analysis.

[0026] S3 specifically includes: S31: Set the time point corresponding to the initial trigger signal as the starting reference point of the solenoid valve action process, and record it as time point ; S32: When it is detected that the first-stage sub-trigger signal is generated, record the corresponding time point as , and define the time interval as the delay stage. The current signal collected within this stage is the initial response of the coil excitation, and the displacement signal changes slightly; S33: When it is detected that the second-stage sub-trigger signal is generated, record the corresponding time point as , and define the time interval as the acceleration stage. In this stage, the displacement signal changes rapidly, corresponding to the rapid start action of the spool; S34: Define the time interval as the stable stage, where is the sampling termination time. In this stage, the displacement signal gradually stabilizes, corresponding to the buffering process after the spool reaches near the rated stroke; S35: Within the entire time interval, use a unified time reference for the coil current and spool displacement signals. Connect the current sensor and displacement sensor respectively using synchronous acquisition channels, and set a unified synchronous sampling period , to ensure that the sampling points have time consistency in each stage, so as to achieve the traceability and accuracy of signal comparison between stages; The above steps precisely divide the solenoid valve action process into three physical response stages through clear time point division and synchronous sampling mechanism, and ensure that the sampling data of the current and displacement signals are strictly aligned in each stage, thereby providing a stable basis for subsequent response feature extraction and time calculation.

[0027] S4 specifically includes: S41: In the acceleration stage, synchronously collect continuous spool displacement signals with the synchronous sampling period , and obtain the displacement value corresponding to each sampling point; S42: Perform a difference operation on the displacement values of two adjacent sampling points in succession to calculate the displacement change rate; S43: Compare point by point all the calculated displacement change rates in the acceleration stage, identify the sampling point corresponding to the maximum value of the displacement change rate, and record the time corresponding to this sampling point as the mechanical action point; The above steps clearly identify the critical moment of the mechanical action by accurately calculating and judging the time point corresponding to the maximum value of the spool displacement change rate, thereby improving the accuracy and repeatability of the determination of the mechanical response characteristics of the solenoid valve.

[0028] The calculation formula for the displacement change rate is: , where, Represents the change rate of spool displacement, with the unit of millimeters per second; and are respectively the th and th spool displacement values at the sampling points, both with the unit of millimeters; is the synchronous sampling period, with the unit of seconds.

[0029] S5 specifically includes: S51: Mark the time point corresponding to the current rising to 10% of the rated value in the sampling data during the delay stage as the electromagnetic starting point; S52: Mark the time point corresponding to the maximum change rate of displacement during the acceleration stage as the mechanical action point; S53: With a unified time reference, take the time difference between the mechanical action point and the electromagnetic starting point as the mechanical delay time. Find the corresponding sampling index positions of the two through the unified sampling time series, and use the sampling steps and sampling period between them for time difference conversion to obtain the final value of the mechanical delay time; The above steps, by referring to the unified time series and strictly aligning the electromagnetic starting point and the mechanical action point, effectively avoid the interference of sampling errors and ensure that the calculation process of the mechanical delay time has a clear timing basis and high measurement accuracy.

[0030] S53 specifically includes: S531: Record the sampling index numbers of the electromagnetic starting point and the mechanical action point in the unified sampling sequence respectively. Let the index corresponding to the electromagnetic starting point be , and the index corresponding to the mechanical action point be ; S532: Calculate the difference between the two index numbers to obtain the sampling step difference , that is: ; S533: Multiply the sampling step difference by the synchronous sampling period to obtain the mechanical delay time , and the formula is: ; The above steps, through a clear index difference calculation and period conversion method, quantify the time difference into the actual mechanical delay time value, ensuring the engineering operability and dimension consistency of the calculation method, thereby improving the comparability of the measurement results of the solenoid valve response time.

[0031] S6 specifically includes: S61: Record the electromagnetic starting point time corresponding to the current rising to 10% of the rated value during the delay stage as ; S62: Calculate the time difference between the starting point and the electromagnetic starting point during the delay stage, and define this time difference as the electromagnetic delay time , that is: ; S63: Define the time difference from the mechanical action point to when the displacement reaches 90% of the rated stroke as the mechanical movement time, denoted as ; S64: Cumulatively add the electromagnetic delay time , the mechanical delay time , and the mechanical movement time to obtain the total action response time of the solenoid valve . The specific calculation formula is as follows: , where represents the total action response time of the solenoid valve, with the unit of seconds; the above steps ensure the integrity, clarity, and repeatability of the calculation process of the total action response time through the time period division and item-by-item accumulation under a unified time reference, providing accurate time-domain index support for the performance evaluation of the solenoid valve.

[0032] The present invention covers any substitutions, modifications, equivalent methods, and solutions made to the essence and scope of the present invention. To enable the public to have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention. However, those skilled in the art can fully understand the present invention without these detailed descriptions. Additionally, to avoid unnecessary confusion to the essence of the present invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0033] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A transient multi-segment sampling test method for the action response time of a solenoid valve, characterized in that It includes the following steps: S1: Monitor the solenoid valve drive current in real time. When the current change rate first exceeds the dynamic threshold and the duration is greater than the preset debounce time window, generate an initial trigger signal; S2: Based on the initial trigger signal, start high-speed sampling, and calculate the second derivative of the drive current in real time. When the second derivative has a positive zero crossing, generate a first-level sub-trigger signal, and when it has a negative zero crossing, generate a second-level sub-trigger signal; S3: According to the initial trigger signal, the first-level sub-trigger signal, and the second-level sub-trigger signal, divide the solenoid valve action process into a delay stage, an acceleration stage, and a stable stage, and synchronously sample the coil current and spool displacement signal within each stage; S4: Extract the time point when the current rises to 10% of the rated value from the sampling data in the delay stage as the electromagnetic start point, and extract the time point corresponding to the maximum displacement change rate from the sampling data in the acceleration stage as the mechanical action point; S5: Calculate the mechanical delay time according to the time difference between the electromagnetic start point and the mechanical action point, and define the time difference from the mechanical action point to when the displacement reaches 90% of the rated stroke as the mechanical movement time; S6: Define the time difference from the start point of the delay stage to the electromagnetic start point as the electromagnetic delay time, and accumulate the electromagnetic delay time, the mechanical delay time, and the mechanical movement time to obtain the total action response time of the solenoid valve.

2. The transitional state multi-segment sampling test method for the solenoid valve action response time according to claim 1, characterized in that The specific content of S1 includes: S11: Real-time collect the current signal of the solenoid valve drive coil through a Hall current sensor, and convert the collected current signal into a digital signal through an analog-to-digital converter; S12: Perform a derivative operation on the digitized current signal at a fixed period to obtain the current change rate, and compare it with the preset dynamic threshold in real time. When the current change rate first exceeds the dynamic threshold, start the timer to start timing; S13: The timer continuously times and judges in real time whether the current change rate is always greater than the dynamic threshold. When the cumulative timing duration of the timer reaches the 10 ms debounce time window, an initial trigger signal will be generated.

3. The transitional state multi-segment sampling test method for the solenoid valve action response time according to claim 2, characterized in that, The specific content of S12 includes: S121: Collect continuous current signal values at a fixed sampling period to obtain the current values of two adjacent sampling points; S122: Calculate the difference between the current values of two adjacent sampling points using the difference method, and divide it by the corresponding sampling period to obtain the value of the current change rate. The calculation formula is: , where is the current change rate; and respectively represent the current values of the -th and the -th sampling points; is the fixed sampling period.

4. The transitional state multi-segment sampling test method for the solenoid valve action response time according to claim 1, characterized in that, The specific content of S2 includes: S21: Based on the initial trigger signal, start high-speed data collection, and continuously collect the solenoid valve drive current values at a fixed high-speed sampling period; S22: Perform a numerical difference operation on the continuous current signal. By performing difference processing on the current values of every three adjacent sampling points, obtain the second derivative of the current. The calculation formula is: , where is the second derivative of the current , , are the th, and th current sampling values of consecutive samplings; is the fixed sampling period; S23: Monitor the second derivative of the current in real time. When its value changes from negative to positive instantaneously, record it as a positive zero crossing and generate a first-level sub-trigger signal; when its value changes from positive to negative instantaneously, record it as a negative zero crossing and generate a second-level sub-trigger signal.

5. The transitional state multi-segment sampling test method for the solenoid valve action response time according to claim 1, characterized in that, The specific content of S3 includes: S31: Set the time point corresponding to the initial trigger signal as the starting reference point of the solenoid valve action process, and record it as the time point ; S32: When it is detected that the first-level sub-trigger signal is generated, record the corresponding time point as , and define the time interval as the delay stage; S33: When it is detected that the second-level sub-trigger signal is generated, record the corresponding time point as , and define the time interval as the acceleration phase; S34: Define the time interval as the stable stage, where is the sampling termination time; S35: During the entire time interval, a unified time reference is adopted for the coil current and the spool displacement signal. The current sensor and the displacement sensor are respectively connected using synchronous acquisition channels, and a unified synchronous sampling period is set , ensuring that the sampling points have time consistency in each stage.

6. The transitional state multi-segment sampling test method for the solenoid valve action response time according to claim 5, wherein, The specific content of S4 includes: S41: During the acceleration phase, with a synchronous sampling period continuously synchronously collect the spool displacement signals, and obtain the displacement values corresponding to each sampling point; S42: Perform a difference operation on the displacement values of two adjacent sampling points to calculate the displacement change rate; S43: Compare the displacement change rates calculated for all points in the acceleration stage point by point, identify the sampling point corresponding to the maximum displacement change rate value, and record the time corresponding to this sampling point as the mechanical action point.

7. A transient multi-segment sampling test method for the solenoid valve action response time according to claim 6, characterized in that The calculation formula for the displacement change rate is as follows: , where represents the spool displacement change rate; and are respectively the spool displacement values at the -th and the -th sampling points; is the synchronous sampling period.

8. A transient multi-segment sampling test method for the solenoid valve action response time according to claim 1, wherein The specific content of S5 includes: S51: Mark the time point corresponding to the current rising to 10% of the rated value in the sampling data during the delay stage as the electromagnetic starting point; S52: Mark the time point corresponding to the maximum value of the displacement change rate during the acceleration stage as the mechanical action point; S53: Using a unified time reference, take the time difference between the mechanical action point and the electromagnetic starting point as the mechanical delay time. Find the corresponding sampling index positions of the two through the unified sampling time series, and use the sampling steps and sampling period between them for time difference conversion to obtain the final value of the mechanical delay time.

9. A transient multi-segment sampling test method for the solenoid valve action response time according to claim 8, characterized in that, The specific steps of S53 include: S531: Record the sampling index numbers of the electromagnetic starting point and the mechanical action point in the unified sampling sequence respectively. Let the index corresponding to the electromagnetic starting point be , and the index corresponding to the mechanical action point be ; S532: Calculate the difference between two index numbers to obtain the sampling step difference , that is: ; S533: Multiply the sampling step difference by the synchronous sampling period to obtain the mechanical delay time , and the formula is: .

10. A transient multi-segment sampling test method for the solenoid valve action response time according to claim 9, characterized in that The specific steps of S6 include: S61: Denote the electromagnetic starting point time corresponding to the current rising to 10% of the rated value during the delay phase as ; S62: Calculate the time difference between the start point of the calculation delay phase and the electromagnetic start point, and define this time difference as the electromagnetic delay time ; S63: Define the time difference from the mechanical action point to when the displacement reaches 90% of the rated stroke as the mechanical movement time, denoted as ; S64: Cumulatively add the electromagnetic delay time , the mechanical delay time and the mechanical motion time to obtain the total action response time of the solenoid valve .

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