Compatibility test method and system for charging pile

Abstract

The invention provides a charging pile compatibility test method and system, and the method comprises the steps: collecting current demand information and pile end power output parameters issued by a vehicle end, and obtaining a target current change curve; according to the target curve, the actual current of the pile end in the charging process is collected, the vehicle instruction issuing moment is marked in the curve, and an actual current curve corresponding to the target curve is obtained; comparing the target curve with an actual curve, and calculating a current climbing rate, a current descending rate and an overshoot amplitude to obtain a dynamic difference index; and the compatibility of the bicycle pile in the charging process is judged according to the difference index, and a judgment result is obtained. According to the method, target curve constraint is aligned with an actual curve, so that a difference index can reflect a dynamic process, and the problem of missed rate mismatching of static test is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of data processing, and particularly relates to a compatibility test method and system of a charging pile. BACKGROUND

[0002] In the existing compatibility test method of the charging pile, the test process usually mainly verifies whether the charging communication protocol normally interacts, and whether the static extreme value of the output voltage and current of the pile end meets the demand of the vehicle end. Such method can find the mismatching problem of the charging pile and the vehicle in the basic parameter range, such as insufficient maximum output current, output voltage overrun, communication handshake failure and the like. However, in the actual application, the electric vehicle often dynamically adjusts the current demand in the charging process, and the pile end also changes the output curve due to heat dissipation, power scheduling or power grid fluctuation, and the existing test method cannot comprehensively cover these dynamic processes.

[0003] In particular, when the climbing rate or falling rate of the current requested by the vehicle end is different from the response rate actually output by the charging pile, the current overshoot, response delay or current drop may occur. Such problems are not easy to be exposed in the traditional static test, but may trigger the protection mechanism of the vehicle or the pile end in the real charging scene, causing the charging interruption, and forming a typical compatibility hidden danger. Therefore, the existing test method has obvious deficiency in the dynamic response rate of the current. SUMMARY

[0004] The main purpose of the present application is to solve the technical problem that the existing compatibility test method of the charging pile cannot effectively detect the dynamic difference of the current climbing rate, falling rate and overshoot amplitude between the vehicle end and the charging pile end; The present application provides a compatibility test method of a charging pile, which comprises: collecting the current demand information issued by the vehicle end through the charging communication protocol and the power output parameter of the charging pile end, to obtain a target current change curve; According to the target current change curve, the change process of the current output by the charging pile over time in the charging process is collected, and the instruction issuing time of the vehicle end is marked, to obtain an actual current change curve corresponding to the target current change curve; According to the target current change curve and the actual current change curve, the current climbing rate, falling rate and overshoot amplitude are compared, to obtain a difference index reflecting the dynamic difference between the vehicle end and the charging pile end; According to the difference index, the compatibility of the charging pile and the vehicle end in the charging process is determined, to obtain a compatibility determination result.

[0005] The present application also provides a compatibility test system of a charging pile, which comprises: a target curve unit configured to collect current demand information issued by a vehicle end through a charging communication protocol and power output parameters of a charging pile end, and obtain a target current change curve; a curve collection unit configured to collect a change process of a current output by the charging pile during a charging process according to the target current change curve, and mark an instruction issuing time of the vehicle end, and obtain an actual current change curve corresponding to the target current change curve; a difference analysis unit configured to compare a current climbing rate, a current falling rate and an overshoot amplitude according to the target current change curve and the actual current change curve, and obtain a difference index reflecting a dynamic difference between the vehicle end and the charging pile end; a compatibility determination unit configured to determine compatibility between the charging pile and the vehicle end during the charging process according to the difference index, and obtain a compatibility determination result.

[0006] The compatibility test method and system of the charging pile, by collecting the current demand information issued by the vehicle end and the power output parameters of the pile end, obtain the target current change curve; according to the target curve, the actual current of the pile end during the charging process is collected, and the vehicle instruction issuing time is marked in the curve, and the actual current curve corresponding to the target curve is obtained; the target curve and the actual curve are compared, the current climbing rate, the current falling rate and the overshoot amplitude are calculated, and the dynamic difference index is obtained; the compatibility between the vehicle and the pile during the charging process is determined according to the difference index, and the determination result is obtained. The method aligns the target curve constraint with the actual curve, so that the difference index can reflect the dynamic process, thereby avoiding the problem of missing rate mismatch in static test.

[0007] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application will be realized and achieved by the structure particularly pointed out in the description, claims and drawings.

[0008] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are specifically described below, and the accompanying drawings are shown as follows. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a first embodiment schematic diagram of the compatibility test method of the charging pile in the embodiment of the present application; Figure 2 It is a second embodiment schematic diagram of the compatibility test method of the charging pile in the embodiment of the present application; Figure 3 It is an embodiment schematic diagram of the compatibility test system of the charging pile in the embodiment of the present application. DETAILED DESCRIPTION

[0010] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be described clearly and completely below with reference to the drawings, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0011] The terms "comprising" and "having" and any variations thereof in the embodiments of the present application are intended to cover the inclusions without exclusivity. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but optionally further includes other steps or units not listed, or optionally further includes other steps or units inherent to the process, method, product or device.

[0012] In order to facilitate the understanding of the embodiments, first, a compatibility test method of a charging pile disclosed by the embodiments of the present application will be described in detail. As shown in the figure, Figure 1 The method comprises the following steps: 101. Collecting current demand information issued by a vehicle end through a charging communication protocol and power output parameters of a charging pile end to obtain a target current change curve; In the embodiments, the collecting the current demand information issued by the vehicle end through the charging communication protocol and the power output parameters of the charging pile end to obtain the target current change curve comprises: analyzing the current demand information issued by the vehicle end through the charging communication protocol to obtain a current demand instruction sequence with a time stamp; collecting and boundary normalizing the power output parameters of the charging pile end to obtain pile side operation parameters, wherein the pile side operation parameters include maximum / minimum output current, voltage limiting interval, power limit value, slope or step limit and output adjustment period; boundary checking and amplitude limiting the current demand instruction sequence according to the pile side operation parameters to obtain a compliant current demand instruction meeting pile side operation constraints; time aligning and interpolating and smoothing the compliant current demand instruction according to an instruction time stamp and the output adjustment period to obtain the target current change curve.

[0013] Specifically, the vehicle end will periodically issue current demand information during the charging process, which is usually generated by the battery management system and transmitted to the pile end through the charging communication protocol. The current demand information not only contains the current value, but also implies the battery state of charge, temperature limit and the strategy of the current charging stage. The test system parses these communication messages and records them in chronological order to form a current demand instruction sequence with time markers. The formation of this sequence ensures that each current instruction corresponds to the actual issuance time, thereby providing basic data for subsequent generation of target curves.

[0014] Secondly, the power output parameters of the charging pile end are collected and sorted to obtain the pile side operating parameters. The power output capability of the pile end is usually affected by various factors, including the rated current range of the power module, the allowed voltage interval, the total power upper limit, the internal protection mechanism, the heat dissipation capability and the power regulation period, etc. In order to avoid the vehicle end demand exceeding the physical capability of the pile end, the parameters are collected and standardized as a set of unified boundary conditions as the constraint reference of the vehicle demand. For example, if the current requested by the vehicle exceeds the maximum allowed value of the pile end module, the request needs to be adjusted so that it falls within the executable range of the pile end.

[0015] Then, according to the pile side operating parameters, the current demand instruction sequence of the vehicle end is checked and corrected one by one to obtain the compliant instructions that meet the pile end operating constraints. Specifically, first, check whether each instruction exceeds the maximum or minimum current boundary of the pile end, and if it does, limit the amplitude. Then, combined with the power upper limit and voltage limit of the pile end, the instruction is checked again to prevent the vehicle end demand from being reasonable in value but still exceeding the pile end carrying range in power calculation. Finally, the current change amplitude between adjacent two instructions is checked, if the change is too fast and exceeds the allowed regulation slope or step limit of the pile end, the instruction is corrected so that the current change speed remains within the dynamic range executable by the pile end. Through this series of processing, it can effectively prevent the generated target curve from appearing "false demand" that the pile end cannot execute.

[0016] After obtaining the compliance instruction sequence, the problem of inconsistency between the vehicle end issuing period and the pile end power adjustment period also needs to be solved. Generally, there is a deviation between the control period of the vehicle end and the control period of the pile end power module, and if not handled, it is easy to cause time sequence misalignment in subsequent comparison. Therefore, in the embodiment, the compliance instruction sequence is uniformly aligned according to the adjustment period of the pile end, and interpolation and smoothing processing is performed between adjacent instructions. For example, when the vehicle end requests a larger current at a time point and requests a smaller current at the next time point, if the two points are directly connected, it will cause the target curve to present a mutation, which is not conducive to actual execution. The embodiment supplements the transition value between the two points, so that the change process of the curve presents a smooth transition, avoiding unnecessary sudden jumps.

[0017] Through the above processing, a target current change curve is finally obtained. The curve not only reflects the demand trend of the vehicle end at different time points, but also ensures that all points are within the physical constraint range of the pile end, and is continuous and smooth on the time axis. Therefore, the target curve can be used as a unified reference standard for subsequent actual current collection and comparison.

[0018] Further, the boundary checking and amplitude limiting processing of the current demand instruction sequence according to the pile side operation parameters to obtain the compliance current demand instruction that meets the pile side operation constraint includes: comparing the current demand instruction sequence with the maximum / minimum output current in the pile side operation parameters item by item to obtain a boundary checked instruction sequence; performing constraint processing on the boundary checked instruction sequence according to the power limit value and voltage limit interval in the pile side operation parameters to obtain a power voltage constrained instruction sequence; performing differential correction on the power voltage constrained instruction sequence according to the slope or step limit in the pile side operation parameters to obtain a rate constrained instruction sequence; and performing consistent processing on the rate constrained instruction sequence according to the output adjustment period to obtain the compliance current demand instruction.

[0019] Specifically, the current demand instruction sequence is compared item by item with the maximum output current and the minimum output current of the pile end. When the current value in the instruction exceeds the maximum value allowed by the pile end, the instruction is corrected to the maximum allowed value; when the instruction value is lower than the minimum value of the pile end, it is corrected to the minimum allowed value. After this processing, the obtained instruction sequence is in the rated working interval of the pile end, and will not appear over-request or too low request.

[0020] The instruction sequence checked by the boundary needs to be further combined with the power limit and voltage interval of the pile end to be constrained. Each instruction is multiplied by the corresponding voltage value to obtain the instantaneous power. When the instantaneous power exceeds the upper limit of the power of the pile end, the current value of the instruction is adjusted downward until the power condition is met. If the current and voltage combination is outside the allowed interval of the pile end, the current value also needs to be adjusted to be within the voltage range. Through this constraint, the instruction sequence can avoid exceptions caused by power overload or voltage out-of-range.

[0021] After meeting the current, power and voltage boundaries, the change amplitude between adjacent instructions also needs to be corrected. The pile end power module has a slope or step limit in dynamic response. When it is detected that the change between adjacent instructions exceeds the limit, the instruction is corrected. For example, the vehicle end may request the current to jump from fifty amperes to one hundred amperes in a time slice, while the pile end can only adjust twenty amperes in a cycle. At this time, the instruction is corrected to seventy amperes, and the remaining adjustment will be completed in the subsequent cycle. After this processing, the obtained instruction sequence changes gently, and the pile end can gradually execute according to its own ability, and sudden changes that cannot be followed will not occur.

[0022] The instruction sequence after rate constraint needs to be time-aligned according to the output adjustment period of the pile end. The issuance period of the vehicle end instruction is usually shorter than the control period of the pile end power module. If they are directly corresponding, it will cause the time reference to be misaligned. Therefore, the instruction sequence is uniformly mapped to the adjustment period of the pile end. If there is a lack of corresponding instructions at a certain cycle node, an intermediate value is generated according to the values of the adjacent two points to fill in, so that the instructions completely cover the pile end period on the time axis. When the vehicle end issues multiple instructions in a short time and the pile end only adjusts at certain cycle points, the mapped sequence can ensure that the execution process of the pile end is consistent with the trend of the vehicle demand.

[0023] After the above processing, the compliant current demand instruction obtained is in the current range of the pile end in value, is feasible under the power and voltage constraints, is in the allowed change rate interval in dynamic response, and is aligned with the pile end control period in time node.

[0024] 102. According to the target current change curve, the change process of the current output by the charging pile during the charging process with time is collected, and the instruction issuance time of the vehicle end is marked to obtain an actual current change curve corresponding to the target current change curve; In this embodiment, the acquisition process is completed by the current sensor in the pile end output circuit. The test system generates a sampling control signal according to the time node of the target current change curve and sends the control signal to the current acquisition device. After receiving the trigger signal, the current sensor records the current value output by the pile end in real time and automatically attaches a sampling time stamp to the sampling data. In this way, a series of time-stamped current measurement data can be continuously obtained throughout the charging period, covering the entire process of charging start, power climb, constant power maintenance, and current drop.

[0025] While collecting current data, it is also necessary to identify the instruction edge of the current demand information issued by the vehicle end. The battery management system of the vehicle end will periodically issue current demand during charging. When a new instruction message appears, the test system records the arrival time of the message through the communication analysis module and inserts it as an event point into the current measurement data sequence. In this way, each current measurement value can be correlated with the time when the vehicle end issues an instruction in addition to its own sampling time.

[0026] To ensure the accuracy of the markers, the test system aligns the transmission time of the vehicle end communication message with the local sampling time of the pile end. The alignment method uses a unified clock source as a reference to map the arrival time of the vehicle end instruction to the time axis of the sampling sequence. When a certain instruction is detected, a edge marker is immediately inserted at the corresponding sampling point. For example, if the vehicle end issues an instruction to increase the current at 300 milliseconds, a marker signal is inserted at the sampling point near 300 milliseconds. This ensures that the time sequence of "instruction issuance" and "current response" can be clearly distinguished during subsequent comparison.

[0027] In some scenarios, the issuance period of the vehicle end instruction may not completely coincide with the sampling period. To avoid misalignment, this embodiment inserts a compensation point between adjacent sampling data when the corresponding sampling point is missing. The value of the compensation point is calculated based on the trend of the adjacent measurement results. The compensation point also carries an instruction marker, ensuring that the actual current change curve corresponds one-to-one with the target curve on the time axis and does not lose due to differences in sampling frequency.

[0028] After completing the time marking and data compensation, the test system performs continuity verification on the collected current measurement data to remove abnormal points caused by transient interference. The processed data is stored as a time-ordered current value sequence, which includes both the actual output current of the pile end at each time and the event points of the vehicle end instruction issuance. By connecting the data sequence, the actual current change curve can be generated. The horizontal axis of the curve is the unified time reference, and the vertical axis is the sampling current value. The positions of the vehicle end instruction issuance are marked on the curve.

[0029] The actual current change curve obtained thereby can not only reflect the real output behavior of the pile end in the charging process, but also accurately correspond to the demand instruction of the vehicle end. Whether the rise or fall of a certain section of the current in the curve is synchronized with the instruction mark and the sequence of current change can be directly observed. If the current change is obviously lagging behind the instruction mark, it means that the execution speed of the pile end is insufficient; if the current change amplitude exceeds the expected interval of the instruction mark, it means that there is overshoot or undershoot.

[0030] 103. According to the target current change curve and the actual current change curve, the current climbing rate, the falling rate and the overshoot amplitude are compared to obtain a difference index reflecting the dynamic difference between the vehicle end and the charging pile end. In the embodiment, the comparison of the current climbing rate, the falling rate and the overshoot amplitude according to the target current change curve and the actual current change curve to obtain the difference index reflecting the dynamic difference between the vehicle end and the charging pile end comprises: calculating the slope of the current increase process of the target current change curve and the actual current change curve in the same time interval to obtain the target climbing rate sequence and the actual climbing rate sequence; calculating the slope of the current decrease process of the target current change curve and the actual current change curve to obtain the target falling rate sequence and the actual falling rate sequence; calculating the amplitude difference between the peak value of the actual current change curve before reaching the steady state and the stable value of the target current change curve at the corresponding time point to obtain the overshoot amplitude sequence; and performing point-by-point difference according to the target climbing rate sequence, the actual climbing rate sequence, the target falling rate sequence, the actual falling rate sequence and the overshoot amplitude sequence to obtain the difference index representing the dynamic difference between the vehicle end and the charging pile end.

[0031] Specifically, the comparison of the current climbing rate is performed in the current rising interval of the target curve and the actual curve. The test system identifies the time interval in which the current gradually rises from low value to constant power stage in the target curve, and calculates the change speed of the target curve in this interval. At the same time, the current change process of the corresponding time interval in the actual curve is found, and the actual climbing speed of the pile end current is calculated. By corresponding the two speed sequences point by point, the target climbing rate sequence and the actual climbing rate sequence are obtained. When there is a significant gap between the two, it can reflect that the following property of the pile end current response is insufficient.

[0032] The comparison of the descent rate is performed in the current decline interval of the target curve and the actual curve. The vehicle end usually reduces the current in the later stage of charging to enter the constant voltage stage or the end of charging. The test system extracts the changing trend of the decline stage in the target curve and finds the corresponding current decline process in the actual curve. By calculating the target and actual descent rates in the same time window, the target descent rate sequence and the actual descent rate sequence are obtained. If the actual descent rate is much greater than the target value, it means that the current at the pile end drops too fast, which may cause the vehicle battery protection mechanism to be triggered; if the actual descent rate is significantly lower than the target value, it means that the pile end falls back slowly and there is an under-following problem.

[0033] During the overshoot amplitude comparison process, the test system focuses on analyzing the peak value of the actual curve before it approaches steady state. The target curve on the vehicle side tends to flatten near the stable point, while the actual output on the charging station side may exhibit transient peaks due to control lag or overly rapid response. The test system locates the peak point on the actual curve and compares it with the stable value of the target curve at the corresponding time point. The difference is the overshoot amplitude, which reflects the degree of overshoot at the charging station side during the dynamic process. Excessive overshoot amplitude can affect the battery charging safety on the vehicle side and is therefore a key metric in compatibility evaluation.

[0034] After obtaining the climb rate sequence, descent rate sequence, and overshoot amplitude sequence, the test system performs a point-by-point difference between the target and actual results to form a difference index. The differenced result can quantitatively describe the dynamic differences between the vehicle-side and the charging pile during the charging process. For example, when the target climb rate is ten amperes per second during a certain period of time, while the actual climb rate is only five amperes per second, the difference index is marked as a deviation of five amperes per second; when the actual descent rate exceeds twice the target descent rate, the difference index is reflected as a deviation value of overspeed descent; when the overshoot amplitude exceeds the target value setting range, the difference index is recorded as overshoot amplitude. All these difference indicators are organized into a set of time-varying sequences that can intuitively represent the dynamic inconsistency between the vehicle-side demand and the charging pile-side response.

[0035] 104. Based on the difference index, determine the compatibility between the charging pile and the vehicle during the charging process to obtain a compatibility determination result.

[0036] In this embodiment, the compatibility between the charging pile and the vehicle end during the charging process is determined based on the difference index, and the compatibility determination result is obtained, including: comparing the difference index with the preset compatibility threshold set item by item to obtain the determination result corresponding to each difference index; weighted summarizing the determination results to obtain a comprehensive difference evaluation value during the charging process; matching processing is performed according to the corresponding relationship between the comprehensive difference evaluation value and the compatibility threshold set to obtain the compatibility level of the charging pile and the vehicle end, and generating a compatibility determination result based on the compatibility level.

[0037] Specifically, the determination process is based on the difference indicators, which are compared with a preset compatibility threshold set one by one. The threshold set consists of multiple limits related to charging safety and stability, such as the maximum allowed value of current ramp-up rate deviation, the maximum allowed value of current drop rate deviation, the allowed range of overshoot amplitude, etc. In the one-by-one comparison process, the test system compares each value in the difference indicator sequence with the corresponding threshold in turn. When the indicator value is less than or equal to the threshold, it is recorded as passed; when the indicator value is greater than the threshold, it is recorded as failed. In this way, each type of difference indicator will get an independent determination result.

[0038] For the above one-by-one determination results, the test system further performs weighted aggregation processing. Different types of indicators are not equally important in compatibility evaluation. For example, the deviation of current ramp-up rate has a greater impact on vehicle battery safety than a slight overshoot amplitude, so different weights are given in the weighting process. The setting of weights can be determined according to industry standards, vehicle end safety requirements, or pile end design parameters. The test system superimposes all determination results according to the preset weights to obtain a comprehensive difference evaluation value. This evaluation value can reflect the overall matching degree of vehicle end requirements and pile end responses in the entire charging process.

[0039] After obtaining the comprehensive difference evaluation value, it needs to be matched with the level corresponding relationship of the compatibility threshold set. There are usually multiple level intervals in the threshold set, such as complete compatibility, basic compatibility, risk, and incompatibility. When the comprehensive difference evaluation value falls into the complete compatibility interval, the determination result is complete compatibility; when it falls into the basic compatibility interval, the determination result is basic compatibility; when the evaluation value exceeds the risk interval or reaches the incompatibility interval, the test system outputs the corresponding level determination result. Through this level division, not only can we give the conclusion of whether it is compatible, but also can be refined to the compatibility degree, which is convenient for subsequent analysis and improvement.

[0040] After obtaining the compatibility level, the test system generates the final compatibility determination result. This result includes the difference indicator situation in the charging process, the comprehensive evaluation value obtained by weighted aggregation, and the level conclusion. For example, in a certain test, the ramp-up rate deviation and the drop rate deviation are within the threshold range, but the overshoot amplitude exceeds the set allowed value, and after weighted calculation, the comprehensive evaluation value falls into the basic compatibility interval, then the final determination result is "basic compatibility", and the specific situation of overshoot deviation is marked in the result. In this way, the test personnel can clearly see the shortcomings of the charging pile in the dynamic process, rather than just getting a general "pass" or "fail".

[0041] In the embodiment, the current demand information issued by the vehicle end and the power output parameter of the pile end are collected to obtain a target current change curve; the actual current of the pile end in the charging process is collected according to the target curve, and the time when the vehicle instruction is issued is marked in the curve to obtain an actual current curve corresponding to the target curve; the target curve and the actual curve are compared to calculate the current climbing rate, the falling rate and the overshoot amplitude to obtain a dynamic difference index; the compatibility of the vehicle and the pile in the charging process is determined according to the difference index to obtain a determination result. The method aligns the target curve constraint with the actual curve, so that the difference index can reflect the dynamic process, thereby avoiding the problem of missing rate mismatch in static test.

[0042] Referring to Figure 2 Another embodiment of the compatibility test method of the charging pile in the embodiment includes: 201. Collecting the current demand information issued by the vehicle end through the charging communication protocol and the power output parameter of the charging pile end to obtain a target current change curve; In the embodiment, step 201 is similar to step 101 in the first embodiment, and will not be repeated here.

[0043] 202. Generating a sampling control signal according to the time node of the target current change curve, triggering the current sensor of the charging pile output loop to collect to obtain a current measurement data sequence with a sampling time stamp; In the embodiment, the test system generates a group of sampling control signals according to the time node information in the target current change curve. The target current change curve itself has a continuous time sequence, and each node on the curve corresponds to a specific current expected value. The test system extracts these time nodes and uses them as the trigger reference for sampling. The sampling control module outputs control pulses according to the reference to drive the pile end current sensor to sample at the specified time point.

[0044] The current sensor is usually installed in the main current channel of the pile end output loop and can detect the current value output from the pile end to the vehicle in real time. After the trigger signal arrives, the sensor immediately samples the loop current and transmits the measured current value to the data acquisition unit. The data acquisition unit will attach the current system clock time to the data when receiving the current value, thereby forming a current measurement point with a sampling time stamp.

[0045] The entire acquisition process uses the target curve's time nodes as a reference, ensuring that measured data points correspond one-to-one with the target curve. For example, if the target curve sets a current point at one second, the test system triggers sampling at that point to ensure that the obtained current value matches the reference point of the target curve. If the target curve requires higher resolution in certain intervals, the output frequency of the sampling control signal is increased to ensure that the actual acquired data covers all key points of the target curve.

[0046] As sampled data accumulates, the system automatically organizes it into a chronological current measurement data sequence. Each element in this sequence contains the current value and sampling timestamp, fully describing the current output dynamics of the charging station throughout the charging process. To ensure data accuracy, the system also performs stability checks on the raw data, removing outliers caused by external interference and, where necessary, filling in missing points through interpolation. The processed measurement data sequence maintains temporal consistency with the target curve while ensuring data continuity and comparability.

[0047] 203. Mark the current measurement data sequence according to the issuance time of the current demand information to obtain current measurement data with instruction edge marks; In this embodiment, marking the current measurement data sequence according to the time when the current demand information is issued to obtain current measurement data with instruction edge marks includes: performing time edge identification on the current demand information to obtain an event sequence at the time when the instruction is issued; performing timestamp alignment on the current measurement data sequence according to the event sequence to obtain current measurement data including event correspondence; and inserting a marking signal into the current measurement data at the time point of the event correspondence to obtain current measurement data with instruction edge marks.

[0048] Specifically, during the charging process, the vehicle periodically transmits current demand information via a communication protocol. Each message carries a specific delivery time. The test system parses these messages and extracts their timing information. To reflect the correspondence between vehicle command transmissions and charging station current responses in the actual current measurement data, the command times must be mapped to the current measurement sequence.

[0049] Specifically, the test system first identifies the time edges of the current demand information. When a new current demand message is detected, it is considered a command event and the time of the event is recorded. All event points are arranged sequentially to form an event sequence. This sequence represents the time trajectory of vehicle-side command issuance and serves as the basis for subsequent tagging.

[0050] After obtaining the event sequence, the system aligns it with the current measurement data sequence. Each data point in the current measurement data sequence is timestamped. The test system compares the time points in the event sequence with the timestamps in the sampling sequence, finds the closest sampling point, and establishes an event correspondence at that sampling point. If there is a slight deviation between the event time and the sampling point, the system can use interpolation or approximate matching to map the event point to the adjacent sampling point, thereby ensuring accurate time correspondence.

[0051] After time alignment, the system inserts a marker signal at the corresponding sampling point to indicate that the point corresponds to a command issued by the vehicle. For example, if the current value at a certain sampling point is 70 amperes, and the event sequence records a new current request from the vehicle at that moment, the sampling point will be marked with a "command edge marker." After processing, the entire current measurement sequence contains not only the current value and timestamp, but also the command issuance marker information.

[0052] In this way, the current measurement sequence is converted into current measurement data marked with command edges. This data clearly demonstrates the relationship between the vehicle-side commands and the actual current response at the charging pile. Subsequent analysis can directly observe the response speed and magnitude of the current curve after the command is issued, thereby determining the dynamic compatibility between the vehicle and the charging pile. This marked measurement data provides a critical comparison basis for compatibility testing, eliminating the need for manual comparisons in discrepancy analysis and enabling automated alignment and determination through time and event marking.

[0053] 204. Match the current measurement data with the command edge mark with the time nodes of the target current change curve one by one to generate an actual current change curve corresponding to the target current change curve; In this embodiment, after the test system completes the acquisition of current measurement data and the marking of command edges, it needs to match this data with the target current variation curve to generate the actual current variation curve. Specifically, each time node in the target current variation curve contains the expected current value, which is derived from the comprehensive calculation of vehicle-side demand and pile-side constraints. The current measurement data sequence reflects the current output of the pile-side during actual operation and is accompanied by command markings. The two are matched on the time axis, enabling a direct comparison of demand and response.

[0054] The corresponding process takes a unified clock reference as the core. The test system establishes a one-to-one correspondence between the time nodes of the target curve and the time stamps of the current measurement sequence. In the case of complete coincidence between the time nodes and the sampling time, the current value of the sampling point is directly taken as the corresponding point; when there is a difference between the time nodes and the sampling time, the closest sampling point is selected, or an interpolated value is inserted between the adjacent two sampling points, so as to align the target node. This correspondence ensures the strict correspondence of the target curve and the actual curve in the time dimension, and there is no misalignment phenomenon.

[0055] While establishing the correspondence, the data also needs to be enhanced by using the instruction edge mark. The instruction mark indicates that the vehicle end issues a new current demand at this time, so the test system marks this point on the actual curve, so that the timing relationship between the instruction and the response can be clearly seen during the analysis process. For example, when the target curve requires an increase in current at a certain time, the actual curve rises a period of time after the instruction mark, and this delay can be clearly recorded.

[0056] When all the time nodes of the target curve are established in correspondence with the current measurement data, the system will sequentially connect these corresponding points to form a complete actual current change curve. This curve not only retains the current output trend of the pile end, but also contains the marked points of the vehicle end instruction, so as to simultaneously display the relationship between demand, instruction and response on a curve. In order to enhance the continuity and readability of the curve, the system will smooth the abnormal values when connecting the data points, avoiding the curve jitter caused by transient noise.

[0057] The generated actual current change curve can be directly compared with the target current change curve. By observing the differences between the two, it can be judged whether the pile end responds in time, the amplitude is appropriate, and whether there is overshoot or lag phenomenon in different stages. Especially in the rapid change stage of current, the deviation between the actual curve and the target curve is often more obvious, and these deviations are the focus of compatibility test.

[0058] Therefore, in this embodiment, through the one-to-one correspondence of the data with instruction edge marks and the target time nodes, the actual current change curve not only has the characteristics of time alignment, but also has the characteristics of event marking, so that the dynamic matching relationship between the vehicle end instruction and the pile end response can be intuitively presented.

[0059] 205. According to the target current change curve and the actual current change curve, the current ramp-up rate, the current ramp-down rate and the overshoot amplitude are compared to obtain a difference index reflecting the dynamic difference between the vehicle end and the charging pile end; 206. According to the difference index, the compatibility of the charging pile and the vehicle end in the charging process is determined to obtain a compatibility determination result.

[0060] In the embodiment, steps 205-206 are similar to steps 103-104 in the first embodiment, and will not be described here again.

[0061] In the embodiment, the target current change curve is obtained by collecting the current demand information issued by the vehicle end and the power output parameter of the pile end. The actual current of the pile end in the charging process is collected according to the target curve, and the time when the vehicle instruction is issued is marked in the curve to obtain the actual current curve corresponding to the target curve. The target curve and the actual curve are compared to calculate the current climbing rate, the falling rate and the overshoot amplitude to obtain the dynamic difference index. The compatibility of the vehicle and the pile in the charging process is determined according to the difference index to obtain a determination result. The method aligns the target curve constraint with the actual curve, so that the difference index can reflect the dynamic process, thereby avoiding the problem of missing rate mismatch in static test.

[0062] The compatibility test method of the charging pile in the embodiment of the application is described above, and the compatibility test system of the charging pile in the embodiment of the application is described below. Please refer to Figure 3 The compatibility test system of the charging pile in the embodiment of the application includes: A target curve unit 301 is configured to collect the current demand information issued by the vehicle end through the charging communication protocol and the power output parameter of the charging pile end to obtain a target current change curve. A curve collection unit 302 is configured to collect the change process of the current output by the charging pile over time in the charging process according to the target current change curve, and mark the instruction issuing time of the vehicle end to obtain an actual current change curve corresponding to the target current change curve. A difference analysis unit 303 is configured to compare the current climbing rate, the falling rate and the overshoot amplitude according to the target current change curve and the actual current change curve to obtain a difference index reflecting the dynamic difference between the vehicle end and the charging pile end. A compatibility determination unit 304 is configured to determine the compatibility of the charging pile and the vehicle end in the charging process according to the difference index to obtain a compatibility determination result.

[0063] In the embodiment of the present application, the compatibility test system of the charging pile runs the compatibility test method of the charging pile, the compatibility test system of the charging pile collects the current demand information issued by the vehicle end and the power output parameter of the pile end to obtain a target current change curve; according to the target curve, the actual current of the pile end in the charging process is collected, and the time when the vehicle instruction is issued is marked in the curve to obtain an actual current curve corresponding to the target curve; the target curve and the actual curve are compared, the current climbing rate, the falling rate and the overshoot amplitude are calculated, and a dynamic difference index is obtained; the compatibility of the vehicle and the pile in the charging process is judged according to the difference index, and a judgment result is obtained. The method aligns the target curve constraint with the actual curve, so that the difference index can reflect the dynamic process, thereby avoiding the problem of missing rate mismatch in static test.

[0064] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described system or system, unit can refer to the corresponding process in the foregoing method embodiments, which will not be described here.

[0065] The above-described embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A charging pile compatibility test method, characterized in that: The compatibility test method of the charging pile includes: The current demand information sent by the vehicle through the charging communication protocol and the power output parameters of the charging pile are collected to obtain the target current change curve; According to the target current change curve, the change process of the current output by the charging pile during the charging process over time is collected, and the time when the vehicle-side command is issued is marked to obtain an actual current change curve corresponding to the target current change curve; According to the target current change curve and the actual current change curve, the current climbing rate, the falling rate and the overshoot amplitude are compared to obtain a difference index reflecting the dynamic difference between the vehicle end and the charging pile end; Based on the difference index, the compatibility between the charging pile and the vehicle end during the charging process is determined to obtain a compatibility determination result.

2. The charging pile compatibility test method according to claim 1, characterized in that: The current demand information sent by the vehicle end through the charging communication protocol and the power output parameters of the charging pile end are collected to obtain the target current change curve, which includes: Analyze the current demand information sent by the charging communication protocol on the vehicle side to obtain a current demand instruction sequence with a timestamp; The power output parameters of the charging pile are aggregated and boundary normalized to obtain pile-side operating parameters, wherein the pile-side operating parameters include maximum / minimum output current, voltage limit range, power limit, slope or step limit, and output regulation period; Perform boundary verification and amplitude limiting processing on the current demand instruction sequence according to the pile-side operation parameters to obtain a compliant current demand instruction that meets the pile-side operation constraints; The compliant current demand instruction is time-aligned and interpolated and smoothed according to the instruction timestamp and the output regulation period to obtain a target current change curve.

3. The charging pile compatibility test method according to claim 2, characterized in that: The performing boundary check and amplitude limiting processing on the current demand instruction sequence according to the pile-side operation parameters to obtain a compliant current demand instruction that meets the pile-side operation constraints includes: Compare the current demand instruction sequence item by item with the maximum / minimum output current in the pile-side operating parameters to obtain a boundary-checked instruction sequence; Performing constraint processing on the boundary-checked instruction sequence according to the power limit and voltage limit interval in the pile-side operation parameters to obtain an instruction sequence with power and voltage constraints; Performing differential correction on the power and voltage constrained instruction sequence according to the slope or step limit in the pile-side operating parameters to obtain a rate-constrained instruction sequence; The rate-constrained instruction sequence is uniformly processed according to the output regulation cycle to obtain a compliant current demand instruction.

4. The charging pile compatibility test method according to claim 1, characterized in that: The method of collecting the change process of the current output by the charging pile over time during the charging process according to the target current change curve and marking the time when the vehicle-side instruction is issued to obtain the actual current change curve corresponding to the target current change curve includes: Generate a sampling control signal according to the time node of the target current change curve, trigger the current sensor of the charging pile output circuit to collect data, and obtain a current measurement data sequence with a sampling time stamp; Marking the current measurement data sequence according to the issuance time of the current demand information to obtain current measurement data with instruction edge marks; The current measurement data with the instruction edge mark is matched one by one with the time nodes of the target current change curve to generate an actual current change curve corresponding to the target current change curve.

5. The charging pile compatibility test method according to claim 4, characterized in that: The step of marking the current measurement data sequence according to the time of issuing the current demand information to obtain the current measurement data with instruction edge marks includes: Performing time edge recognition on the current demand information to obtain an event sequence at the time when the instruction is issued; Performing time stamp alignment on the current measurement data sequence according to the event sequence to obtain current measurement data containing event correspondences; A marking signal is inserted into the current measurement data at a time point of the event correspondence relationship to obtain current measurement data with an instruction edge mark.

6. The charging pile compatibility testing method according to claim 1, characterized in that: The current rise rate, fall rate, and overshoot amplitude are compared based on the target current change curve and the actual current change curve to obtain a difference index reflecting the dynamic difference between the vehicle end and the charging pile end, including: Calculating the slope of the current increase process of the target current change curve and the actual current change curve in the same time interval to obtain a target climbing rate sequence and an actual climbing rate sequence; Calculating the slopes of the target current change curve and the actual current change curve during the current reduction process to obtain a target decrease rate sequence and an actual decrease rate sequence; Calculating the amplitude difference between the peak value of the actual current change curve before reaching a steady state and the stable value of the target current change curve at a corresponding time point to obtain an overshoot amplitude sequence; Point-by-point differentiation is performed based on the target climbing rate sequence, actual climbing rate sequence, target descent rate sequence, actual descent rate sequence, and overshoot amplitude sequence to obtain a difference index that characterizes the dynamic difference between the vehicle end and the charging pile end.

7. The charging pile compatibility testing method according to claim 1, characterized in that: The compatibility between the charging pile and the vehicle during the charging process is determined based on the difference index, and the compatibility determination result includes: Comparing the difference indicators with the preset compatibility threshold set item by item to obtain a determination result corresponding to each difference indicator; Performing weighted aggregation processing on the determination results to obtain a comprehensive difference evaluation value during the charging process; Matching processing is performed based on the correspondence between the comprehensive difference evaluation value and the compatibility threshold set to obtain the compatibility level between the charging pile and the vehicle end, and a compatibility determination result is generated based on the compatibility level.

8. A charging pile compatibility test system, characterized in that: The compatibility testing system of the charging pile includes: The target curve unit is used to collect the current demand information sent by the vehicle end through the charging communication protocol and the power output parameters of the charging pile end to obtain the target current change curve; A curve acquisition unit is used to collect the change process of the current output by the charging pile during the charging process over time according to the target current change curve, and mark the time when the vehicle-side command is issued to obtain an actual current change curve corresponding to the target current change curve; a difference analysis unit, configured to compare the current rise rate, fall rate, and overshoot amplitude according to the target current change curve and the actual current change curve, and obtain a difference index reflecting the dynamic difference between the vehicle end and the charging pile end; The compatibility determination unit is used to determine the compatibility between the charging pile and the vehicle end during the charging process according to the difference index, and obtain a compatibility determination result.

Images