A transient multi-segment sampling test method for the response time of a solenoid valve

Abstract

The present invention relates to the field of electromechanical control testing technology, and specifically to a transition state multi-stage sampling test method for the solenoid valve action response time, comprising the following steps: S1: real-time monitoring of the solenoid valve drive current to generate an initial trigger signal; S2: generating a first-stage sub-trigger signal and a second-stage sub-trigger signal; S3: dividing the solenoid valve action process into a delay phase, an acceleration phase, and a stabilization phase, and synchronously sampling each phase; S4: extracting the electromagnetic starting point from the delay phase sampled data and the mechanical action point from the acceleration phase sampled data; S5: calculating the mechanical delay time and the mechanical movement time; and S6: accumulating the total solenoid valve action response time. The present invention, through a multi-stage triggering and synchronous sampling mechanism, achieves accurate extraction and cumulative calculation of the response time at each stage of the entire solenoid valve action process, significantly improving the accuracy and reliability of the response characteristic test.

Description

Technical Field

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

[0002] As an electromechanical conversion unit, solenoid valves are widely used in hydraulics, pneumatics, internal combustion engine control and other fields. Their response characteristics directly affect the dynamic performance and control accuracy of the entire system. Especially in high-speed, high-precision control systems, the response time of the solenoid valve (that is, the duration of the entire process from the change of the drive signal to the completion of the valve core movement) is one of the core indicators for evaluating its performance. The current common response time test methods mostly rely on single-point triggering or single-variable measurement methods, which cannot refine the dynamic relationship between electromagnetic drive, mechanical delay and valve core movement process, and the recognition accuracy of transition states is low, making it difficult to fully characterize the complex response process inside the solenoid valve.

[0003] Existing testing methods have significant shortcomings in identifying response time segments. They lack a detailed delineation of the transition characteristics between the electromagnetic and mechanical phases, and are susceptible to noise interference, leading to false triggering and affecting test stability and repeatability. Therefore, a multi-segment sampling test method for the transition state of solenoid valve actuation response time is urgently needed to address these issues. Summary of the Invention

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

[0005] A method for testing the transient state multi-segment sampling of the response time of a solenoid valve comprises the following steps:

[0006] S1: Real-time monitoring of the solenoid valve drive current. When the current change rate exceeds the dynamic threshold for the first time and the duration is longer than the preset debounce time window, an initial trigger signal is generated.

[0007] S2: Starts high-speed sampling based on the initial trigger signal, calculates the second-order derivative of the drive current in real time, generates a first-level sub-trigger signal when the second-order derivative crosses zero in a positive direction, and generates a second-level sub-trigger signal when the second-order derivative crosses zero in a negative direction;

[0008] S3: Based on the initial trigger signal, the first-stage sub-trigger signal, and the second-stage sub-trigger signal, the solenoid valve operation process is divided into a delay phase, an acceleration phase, and a stabilization phase, and the coil current and the valve core displacement signal in each phase are synchronously sampled;

[0009] S4: The time point when the current rises to 10% of the rated value is extracted from the sampling data of the delay phase as the electromagnetic starting point, and the time point corresponding to the maximum displacement change rate is extracted from the sampling data of the acceleration phase as the mechanical action point;

[0010] S5: Calculate the mechanical delay time based on the time difference between the electromagnetic starting point and the mechanical action point. The time difference from the mechanical action point to the displacement reaching 90% of the rated stroke is defined as the mechanical movement time.

[0011] S6: The time difference between the starting point of the delay phase and the electromagnetic starting point is defined as the electromagnetic delay time, and the electromagnetic delay time, mechanical delay time and mechanical movement time are accumulated to obtain the total action response time of the solenoid valve.

[0012] Optionally, the S1 specifically includes:

[0013] S11: The current signal of the solenoid valve driving coil is collected in real time through the Hall current sensor, and the collected current signal is converted into a digital signal through an analog-to-digital converter;

[0014] S12: performing a derivative operation on the digitized current signal at a fixed period to obtain a current change rate, and comparing the current change rate with a preset dynamic threshold in real time. When the current change rate exceeds the dynamic threshold for the first time, a timer is started;

[0015] S13: The timer continuously counts and determines in real time whether the current change rate is always greater than the dynamic threshold. When the accumulated timing of the timer reaches the debounce time window of 10ms, an initial trigger signal is generated.

[0016] Optionally, the S12 specifically includes:

[0017] S121: Collecting continuous current signal values ​​at a fixed sampling period to obtain current values ​​of two adjacent sampling points;

[0018] S122: Calculate the difference between the current values ​​of two adjacent sampling points using the differential method, and divide it by the corresponding sampling period to obtain the value of the current change rate. The calculation formula is: ,in, is the current change rate; and Respectively represent Hedi The current value of each sampling point; is a fixed sampling period.

[0019] Optionally, the S2 specifically includes:

[0020] S21: starting high-speed data acquisition based on the initial trigger signal, and continuously acquiring the solenoid valve drive current value at a fixed high-speed sampling period;

[0021] S22: Perform numerical differential operation on the continuous current signal. By performing differential processing on the current values ​​of each of the three adjacent sampling points, the second-order derivative of the current is obtained. The calculation formula is:

[0022] ,in, is the second-order derivative of the current; 、 、 The continuous sampling 、 and Current sampling value; is a fixed sampling period;

[0023] S23: Real-time monitoring of the second-order derivative of the current. When its value changes from negative to positive, it is recorded as a positive zero crossing and a first-level sub-trigger signal is generated. When its value changes from positive to negative, it is recorded as a negative zero crossing and a second-level sub-trigger signal is generated.

[0024] Optionally, the S3 specifically includes:

[0025] 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 ;

[0026] S32: When the generation of the first-level sub-trigger signal is detected, the corresponding time point is recorded as , and the time interval It is defined as the delay phase;

[0027] S33: When the second-level sub-trigger signal is detected, the corresponding time point is recorded as , and the time interval It is defined as the acceleration phase;

[0028] S34: Set the time interval is defined as the stable phase, where is the sampling end time;

[0029] S35: In the entire time interval, a unified time base is used for the coil current and valve core displacement signals, and the current sensor and displacement sensor are connected to the synchronous acquisition channel respectively, and a unified synchronous sampling period is set. , ensuring that the sampling points are temporally consistent in each stage.

[0030] Optionally, the S4 specifically includes:

[0031] S41: During the acceleration phase, the sampling period is synchronized Synchronously collect continuous valve core displacement signals and obtain the displacement value corresponding to each sampling point;

[0032] S42: performing a differential operation on the displacement values ​​of two consecutive adjacent sampling points to calculate the displacement change rate;

[0033] S43: Compare all calculated displacement change rates during the acceleration phase point by point, identify the sampling point corresponding to when the displacement change rate reaches the maximum value, and record the time corresponding to the sampling point as the mechanical action point.

[0034] Optionally, the calculation formula for the displacement change rate is: ,in, Indicates the rate of change of valve core displacement; and Respectively and The valve core displacement value of each sampling point; is the synchronous sampling period.

[0035] Optionally, the S5 specifically includes:

[0036] S51: Mark the time point corresponding to the current rising to 10% of the rated value in the delay phase sampling data as the electromagnetic starting point;

[0037] S52: marking the time point corresponding to the maximum displacement change rate in the acceleration phase as the mechanical action point;

[0038] S53: Using a unified time reference, the time difference between the mechanical action point and the electromagnetic starting point is used as the mechanical delay time. The corresponding sampling index positions of the two are found through a unified sampling time sequence, and the time difference is converted using the sampling steps and sampling period in between to obtain the final value of the mechanical delay time.

[0039] Optionally, the S53 specifically includes:

[0040] 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 , the index corresponding to the mechanical action point is ;

[0041] S532: Calculate the difference between the two index numbers to obtain the sampling step difference ,Right now: ;

[0042] S533: The sampling step difference Synchronous sampling period Multiply to get the mechanical delay time , the formula is: .

[0043] Optionally, the S6 specifically includes:

[0044] S61: The time when the current rises to 10% of the rated value during the delay phase corresponds to the electromagnetic starting point. ;

[0045] S62: Calculate the time difference between the starting point of the delay phase and the electromagnetic starting point, and define the time difference as the electromagnetic delay time ;

[0046] S63: The time difference from the mechanical action point to the displacement reaching 90% of the rated stroke is defined as the mechanical motion time, recorded as ;

[0047] S64: Accumulate electromagnetic delay time in sequence , Mechanical delay time and mechanical movement time , get the total action response time of the solenoid valve .

[0048] Beneficial effects of the present invention:

[0049] The present invention adopts a dynamic threshold judgment combined with a fixed sampling period strategy to accurately generate an initial trigger signal at the initial stage of the driving current change, and identifies the positive and negative zero-crossing points by real-time calculation of the second-order derivative of the current, thereby dividing the solenoid valve action process into a delay stage, an acceleration stage and a stable stage, realizing high-precision segmented recognition and synchronous data acquisition of the entire process, and effectively solving the problems of fuzzy stage division and asynchronous signal acquisition in traditional methods.

[0050] The present invention can obtain the electromagnetic delay time, mechanical delay time and mechanical movement time respectively by extracting key time points one by one and calculating the index difference, and accumulate and output the total action response time of the solenoid valve under a unified time base, 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

[0051] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0052] Figure 1 Schematic diagram of a method for testing the transient state multi-segment sampling of the solenoid valve action response time according to an embodiment of the present invention;

[0053] Figure 2 Schematic diagram of a process for obtaining mechanical delay time according to an embodiment of the present invention. DETAILED DESCRIPTION

[0054] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. It is also noted that, to provide a more detailed description, the following embodiments are best and preferred embodiments, and those skilled in the art may employ alternative methods for implementing certain known technologies. Furthermore, the accompanying drawings are intended only to provide a more detailed description of the embodiments and are not intended to limit the present invention.

[0055] It should be noted that references in the specification to "one embodiment," "an embodiment," "exemplary embodiments," "some embodiments," etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment will include such specific features, structures, or characteristics. Furthermore, when specific features, structures, or characteristics are described in conjunction with an embodiment, it is within the knowledge of persons skilled in the relevant art to implement such features, structures, or characteristics in conjunction with other embodiments (whether or not explicitly described).

[0056] In general, 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 characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending at least in part on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0057] like Figure 1-Figure 2 As shown, a method for testing the transient state multi-segment sampling of the solenoid valve action response time includes the following steps:

[0058] S1: Real-time monitoring of the solenoid valve drive current. When the current change rate exceeds the dynamic threshold for the first time and the duration is longer than the preset debounce time window, an initial trigger signal is generated.

[0059] S2: Starts high-speed sampling based on the initial trigger signal, calculates the second-order derivative of the drive current in real time, generates a first-level sub-trigger signal when the second-order derivative crosses zero in a positive direction, and generates a second-level sub-trigger signal when the second-order derivative crosses zero in a negative direction;

[0060] S3: Based on the initial trigger signal, the first-stage sub-trigger signal, and the second-stage sub-trigger signal, the solenoid valve operation process is divided into a delay phase, an acceleration phase, and a stabilization phase, and the coil current and the valve core displacement signal in each phase are synchronously sampled;

[0061] S4: The time point when the current rises to 10% of the rated value is extracted from the sampling data of the delay phase as the electromagnetic starting point, and the time point corresponding to the maximum displacement change rate is extracted from the sampling data of the acceleration phase as the mechanical action point;

[0062] S5: Calculate the mechanical delay time based on the time difference between the electromagnetic starting point and the mechanical action point. The time difference from the mechanical action point to the displacement reaching 90% of the rated stroke is defined as the mechanical movement time.

[0063] S6: The time difference between the starting point of the delay phase and the electromagnetic starting point is defined as the electromagnetic delay time, and the electromagnetic delay time, mechanical delay time and mechanical movement time are accumulated to obtain the total action response time of the solenoid valve.

[0064] S1 specifically includes:

[0065] S11: The current signal of the solenoid valve driving coil is collected in real time through the Hall current sensor, and the collected current signal is converted into a digital signal through an analog-to-digital converter;

[0066] S12: performing a derivative operation on the digitized current signal at a fixed period to obtain a current change rate, and comparing the current change rate with a preset dynamic threshold in real time. When the current change rate exceeds the dynamic threshold for the first time, a timer is started;

[0067] S13: The timer continuously counts and determines in real time whether the current change rate is always greater than the dynamic threshold. When the accumulated timing of the timer reaches the 10ms debounce time window, an initial trigger signal is generated. The above steps ensure accurate monitoring of the starting conditions of the solenoid valve action through clear current collection and calculation methods, effectively avoiding false triggering caused by noise interference, and improving the accuracy and reliability of the test results.

[0068] S12 specifically includes:

[0069] S121: Collecting continuous current signal values ​​at a fixed sampling period to obtain current values ​​of two adjacent sampling points;

[0070] S122: Calculate the difference between the current values ​​of two adjacent sampling points using the differential method, and divide it by the corresponding sampling period to obtain the value of the current change rate. The calculation formula is: ,in, is the rate of change of current in amperes per second; and Respectively represent Hedi The current value of each sampling point is in amperes; It is a fixed sampling period in seconds.

[0071] S2 specifically includes:

[0072] S21: starting high-speed data acquisition based on the initial trigger signal, and continuously acquiring the solenoid valve drive current value at a fixed high-speed sampling period;

[0073] S22: Perform numerical differential operation on the continuous current signal. By performing differential processing on the current values ​​of each of the three adjacent sampling points, the second-order derivative of the current (i.e., acceleration) is obtained. The calculation formula is:

[0074] ,in, is the second derivative of the current, in amperes per square second; 、 、 The continuous sampling 、 and Current sampling values, all in amperes; is a fixed sampling period in seconds;

[0075] S23: Real-time monitoring of the second-order derivative of the current. When its value changes from negative to positive, it is recorded as a positive zero-crossing point and a first-level sub-trigger signal is generated. When its value changes from positive to negative, it is recorded as a negative zero-crossing point and a second-level sub-trigger signal is generated. The above steps realize the monitoring of the second-order derivative of the current and the accurate identification of the positive and negative zero-crossing points through clear high-speed sampling and differential calculation methods, thereby accurately dividing the solenoid valve action stage and providing a reliable trigger basis for subsequent data analysis.

[0076] S3 specifically includes:

[0077] 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 ;

[0078] S32: When the generation of the first-level sub-trigger signal is detected, the corresponding time point is recorded as , and the time interval Defined as the delay stage, the current signal collected during this stage is the initial response of the coil excitation, and the displacement signal changes slightly;

[0079] S33: When the second-level sub-trigger signal is detected, the corresponding time point is recorded as , and the time interval Defined as the acceleration phase, the displacement signal changes rapidly during this phase, corresponding to the rapid start-up action of the valve core;

[0080] S34: Set the time interval is defined as the stable phase, where The sampling end time is the time when the displacement signal gradually stabilizes, which corresponds to the buffering process after the valve core reaches a value close to the rated stroke.

[0081] S35: In the entire time interval, a unified time base is used for the coil current and valve core displacement signals, and the current sensor and displacement sensor are connected to the synchronous acquisition channel respectively, and a unified synchronous sampling period is set. , ensuring that the sampling points have temporal consistency in each stage to achieve traceability and accuracy of signal comparison between stages; the above steps accurately 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 current and displacement signals in each stage are strictly aligned, thereby providing a stable foundation for subsequent response feature extraction and time calculation.

[0082] S4 specifically includes:

[0083] S41: During the acceleration phase, the sampling period is synchronized Synchronously collect continuous valve core displacement signals and obtain the displacement value corresponding to each sampling point;

[0084] S42: performing a differential operation on the displacement values ​​of two consecutive adjacent sampling points to calculate the displacement change rate;

[0085] S43: Compare all calculated displacement change rates during the acceleration phase point by point, identify the sampling point corresponding to when the displacement change rate reaches the maximum value, and record the time corresponding to the sampling point as the mechanical action point; the above steps clearly identify the key moment of mechanical action by accurately calculating and judging the time point corresponding to the maximum value of the valve core displacement change rate, thereby improving the accuracy and repeatability of the determination of the mechanical response characteristics of the solenoid valve.

[0086] The calculation formula for the displacement change rate is: ,in, Indicates the rate of change of valve core displacement in millimeters per second; and Respectively and The valve core displacement value of each sampling point is in millimeters; is the synchronous sampling period in seconds.

[0087] S5 specifically includes:

[0088] S51: Mark the time point corresponding to the current rising to 10% of the rated value in the delay phase sampling data as the electromagnetic starting point;

[0089] S52: marking the time point corresponding to the maximum displacement change rate in the acceleration phase as the mechanical action point;

[0090] S53: Using a unified time reference, the time difference between the mechanical action point and the electromagnetic starting point is used as the mechanical delay time. The corresponding sampling index positions of the two are found through a unified sampling time sequence, and the time difference is converted using the sampling steps and sampling period in between to obtain the final value of the mechanical delay time. The above steps strictly align the electromagnetic starting point and the mechanical action point with the unified time sequence as a reference, effectively avoiding the interference of sampling errors and ensuring that the calculation process of the mechanical delay time has a clear timing basis and high measurement accuracy.

[0091] S53 specifically includes:

[0092] 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 , the index corresponding to the mechanical action point is ;

[0093] S532: Calculate the difference between the two index numbers to obtain the sampling step difference ,Right now: ;

[0094] S533: The sampling step difference Synchronous sampling period Multiply to get the mechanical delay time , the formula is: The above steps quantify the time difference into the actual mechanical delay time value through a clear index difference calculation and period conversion method, ensuring the engineering operability and dimensional consistency of the calculation method, thereby improving the comparability of the solenoid valve response time measurement results.

[0095] S6 specifically includes:

[0096] S61: The time when the current rises to 10% of the rated value during the delay phase corresponds to the electromagnetic starting point. ;

[0097] S62: Calculate the time difference between the starting point of the delay phase and the electromagnetic starting point, and define the time difference as the electromagnetic delay time ,Right now: ;

[0098] S63: The time difference from the mechanical action point to the displacement reaching 90% of the rated stroke is defined as the mechanical motion time, recorded as ;

[0099] S64: Accumulate electromagnetic delay time in sequence , Mechanical delay time and mechanical movement time , get the total action response time of the solenoid valve , the specific calculation formula is as follows: ,in, It represents the total action response time of the solenoid valve in seconds. The above steps ensure that the calculation process of the total action response time is complete, clear and repeatable by dividing the time periods under a unified time base and accumulating them item by item, providing accurate time domain indicator support for the performance evaluation of the solenoid valve.

[0100] The present invention encompasses any alternatives, modifications, equivalents, and solutions that fall within the spirit and scope of the present invention. To provide a thorough understanding of the present invention, specific details are described in detail below in connection with the preferred embodiments of the present invention, but those skilled in the art will be able to fully understand the present invention without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of the present invention, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0101] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for testing the transient state multi-segment sampling of the solenoid valve action response time, characterized in that: The following steps are involved: S1: Real-time monitoring of the solenoid valve drive current. When the current change rate exceeds the dynamic threshold for the first time and the duration is longer than the preset debounce time window, an initial trigger signal is generated. S2: Starts high-speed sampling based on the initial trigger signal, calculates the second-order derivative of the drive current in real time, generates a first-level sub-trigger signal when the second-order derivative crosses zero in a positive direction, and generates a second-level sub-trigger signal when the second-order derivative crosses zero in a negative direction; S3: Based on the initial trigger signal, the first-stage sub-trigger signal, and the second-stage sub-trigger signal, the solenoid valve operation process is divided into a delay phase, an acceleration phase, and a stabilization phase, and the coil current and the valve core displacement signal in each phase are synchronously sampled; S4: The time point when the current rises to 10% of the rated value is extracted from the sampling data of the delay phase as the electromagnetic starting point, and the time point corresponding to the maximum displacement change rate is extracted from the sampling data of the acceleration phase 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. The time difference from the mechanical action point to the displacement reaching 90% of the rated stroke is defined as the mechanical movement time. S6: The time difference between the starting point of the delay phase and the electromagnetic starting point is defined as the electromagnetic delay time, and the electromagnetic delay time, mechanical delay time and mechanical movement time are accumulated to obtain the total action response time of the solenoid valve.

2. A method for testing the transient state multi-segment sampling of the solenoid valve action response time according to claim 1, characterized in that: Said S1 specifically includes: S11: The current signal of the solenoid valve driving coil is collected in real time through the Hall current sensor, and the collected current signal is converted into a digital signal through an analog-to-digital converter; S12: performing a derivative operation on the digitized current signal at a fixed period to obtain a current change rate, and comparing the current change rate with a preset dynamic threshold in real time. When the current change rate exceeds the dynamic threshold for the first time, a timer is started; S13: The timer continuously counts and determines in real time whether the current change rate is always greater than the dynamic threshold. When the accumulated timing of the timer reaches the debounce time window of 10ms, an initial trigger signal is generated.

3. The method for testing the transient state multi-segment sampling of the solenoid valve action response time according to claim 2, characterized in that: The S12 specifically includes: S121: Collecting continuous current signal values ​​at a fixed sampling period to obtain current values ​​of two adjacent sampling points; S122: Calculate the difference between the current values ​​of two adjacent sampling points using the differential method, and divide it by the corresponding sampling period to obtain the value of the current change rate. The calculation formula is: ,in, is the current change rate; and Respectively represent Hedi The current value of each sampling point; is a fixed sampling period.

4. The method for testing the transient state multi-segment sampling of the solenoid valve action response time according to claim 1, characterized in that: The S2 specifically includes: S21: starting high-speed data acquisition based on the initial trigger signal, and continuously acquiring the solenoid valve drive current value at a fixed high-speed sampling period; S22: Perform numerical differential operation on the continuous current signal. By performing differential processing on the current values ​​of each of the three adjacent sampling points, the second-order derivative of the current is obtained. The calculation formula is: ,in, is the second-order derivative of the current 、 、 The continuous sampling 、 and Current sampling value; is a fixed sampling period; S23: Real-time monitoring of the second-order derivative of the current. When its value changes from negative to positive, it is recorded as a positive zero crossing and a first-level sub-trigger signal is generated. When its value changes from positive to negative, it is recorded as a negative zero crossing and a second-level sub-trigger signal is generated.

5. The method for testing the transient state multi-segment sampling of the solenoid valve action response time according to claim 1, characterized in that: 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 the time point ; S32: When the generation of the first-level sub-trigger signal is detected, the corresponding time point is recorded as , and the time interval It is defined as the delay phase; S33: When the second-level sub-trigger signal is detected, the corresponding time point is recorded as , and the time interval It is defined as the acceleration phase; S34: Set the time interval is defined as the stable phase, where is the sampling end time; S35: In the entire time interval, a unified time base is used for the coil current and valve core displacement signals, and the current sensor and displacement sensor are connected to the synchronous acquisition channel respectively, and a unified synchronous sampling period is set. , ensuring that the sampling points are temporally consistent in each stage.

6. A method for testing the transient state multi-segment sampling of the solenoid valve action response time according to claim 5, characterized in that: The S4 specifically includes: S41: During the acceleration phase, the sampling period is synchronized Synchronously collect continuous valve core displacement signals and obtain the displacement value corresponding to each sampling point; S42: performing a differential operation on the displacement values ​​of two consecutive adjacent sampling points to calculate the displacement change rate; S43: Compare all calculated displacement change rates during the acceleration phase point by point, identify the sampling point corresponding to when the displacement change rate reaches the maximum value, and record the time corresponding to the sampling point as the mechanical action point.

7. A method for testing the transient state multi-segment sampling of the solenoid valve response time according to claim 6, characterized in that: The calculation formula of the displacement change rate is: ,in, Indicates the rate of change of valve core displacement; and Respectively and The valve core displacement value of each sampling point; is the synchronous sampling period.

8. The method for testing the transient state multi-segment sampling of the solenoid valve response time according to claim 1, characterized in that: The S5 specifically includes: S51: Mark the time point corresponding to the current rising to 10% of the rated value in the delay phase sampling data as the electromagnetic starting point; S52: marking the time point corresponding to the maximum displacement change rate in the acceleration phase as the mechanical action point; S53: Using a unified time reference, the time difference between the mechanical action point and the electromagnetic starting point is used as the mechanical delay time. The corresponding sampling index positions of the two are found through a unified sampling time sequence, and the time difference is converted using the sampling steps and sampling period in between to obtain the final value of the mechanical delay time.

9. The method for testing the transient state multi-segment sampling of the solenoid valve action response time according to claim 8, characterized in that: 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 , the index corresponding to the mechanical action point is ; S532: Calculate the difference between the two index numbers to obtain the sampling step difference ,Right now: ; S533: The sampling step difference Synchronous sampling period Multiply to get the mechanical delay time , the formula is: .

10. The method for testing the transient state multi-segment sampling of the solenoid valve action response time according to claim 9, characterized in that: The S6 specifically includes: S61: The time when the current rises to 10% of the rated value during the delay phase corresponds to the electromagnetic starting point. ; S62: Calculate the time difference between the starting point of the delay phase and the electromagnetic starting point, and define the time difference as the electromagnetic delay time ; S63: The time difference from the mechanical action point to the displacement reaching 90% of the rated stroke is defined as the mechanical motion time, recorded as ; S64: Accumulate electromagnetic delay time in sequence , Mechanical delay time and mechanical movement time , get the total action response time of the solenoid valve .

Images