Charging pile state prompting method and device and charging pile

Abstract

The invention discloses a charging pile state prompting method and device and a charging pile, and relates to the technical field of charging pile state monitoring. Therefore, the number distribution, the change trend and the change amplitude of the charging current value on the current change curve in the charging period are reflected through the period analysis value, so that the charging process of the charging system is prompted to have entered a relatively stable and regular stage, and the remaining charging time can be further predicted. Therefore, the information is timely pushed to the charging user, so that the charging user has a clear charging expectation for the charging duration, and subsequent time can be reasonably arranged.

Description

Technical Field

[0001] The present invention relates to the technical field of charging pile status monitoring, and in particular to a charging pile status prompting method, device and charging pile. Background Art

[0002] With the rapid development of the new energy vehicle industry, charging piles, as key infrastructure, have gradually been introduced into daily family life. When charging users use charging piles to charge, they have a strong demand for the remaining charging time and have reasonable plans for subsequent trips or arrangements.

[0003] In the prior art, traditional methods often only display basic parameters such as charging current and voltage, failing to comprehensively and in-depth predict the remaining charging time, which affects users' reasonable planning of subsequent trips. Therefore, the present application analyzes the changes in charging current data to obtain a stability analysis value, reflecting whether the charging current changes are stable during the charging operation of the charging pile, thereby determining whether the charging state has entered the constant voltage charging stage or the trickle charging stage, providing data support for the charging status of the charging pile to the charging user. In addition, the charging current within the charging cycle is periodically analyzed to obtain a cycle analysis value, which reflects the quantitative distribution, change trend, and change amplitude of the charging current value on the current change curve during the charging cycle. This helps to indicate that the charging process of the charging system has entered a relatively stable and regular stage. It can further predict the remaining charging time. The historical charging data is combined with the charging data to analyze the remaining charging time, reflecting the actual charging process, reducing prediction errors, and improving the reliability of the charging end time information provided to the user. The charging user can reasonably plan his trip based on the expected charging end time, avoiding long waits or missing the charging completion time. Summary of the Invention

[0004] The object of the present invention is to provide a charging pile status prompt method to solve at least one of the above-mentioned problems in the prior art.

[0005] In a first aspect, the present invention provides a charging pile status prompt method, comprising: During the charging cycle, the change degree value and the change rate value are obtained and quantified to obtain a change stability signal; Based on the changing stable signal, adjacent quantity values ​​and adjacent change values ​​are obtained, and quantized to obtain periodic analysis values, thereby generating a periodic change signal; Based on the periodic change signal, the historical charging end time is obtained, and the charging current within the historical charging end time range is analyzed to obtain the estimated charging end time.

[0006] In a second aspect, the present invention provides a charging pile status prompt device, comprising the following modules: Change analysis module: During the charging cycle, the change degree value and change rate value are obtained and quantified to obtain the change stability signal; Periodic evaluation module: Based on the change stability signal, it obtains the adjacent quantity values ​​and adjacent change values, performs quantization processing, obtains the periodic analysis value, and generates the periodic change signal; Prediction end module: Based on the periodic change signal, the historical charging end time is obtained, the charging current within the historical charging end time range is analyzed, and the estimated charging end time is obtained.

[0007] In a third aspect, a charging pile includes the charging pile status prompt device described in the second aspect.

[0008] Beneficial effects of the present invention: 1. During the charging cycle, the present invention obtains a stable analysis value by analyzing the change of charging current data. The stable analysis value reflects the amplitude change of the charging current between different monitoring nodes and the speed of the charging current change. It comprehensively evaluates whether the charging current change is stable when the charging pile is in the charging operation state, thereby judging whether the charging state has entered the constant voltage charging stage or the charging trickle charging stage, and then understanding the charging status of the charging pile, providing data support for pushing the charging status of the charging pile to the charging user; 2. The present invention periodically analyzes the charging current within a charging cycle to obtain a periodic analysis value. The periodic analysis value reflects the quantity distribution, change trend, and change amplitude of the charging current value on the current change curve within the charging cycle, thereby facilitating a prompt that the charging process of the charging system has entered a relatively stable and regular stage. The remaining charging time can be further predicted and promptly pushed to the charging user, so that the charging user has a clear expectation of the charging time and is convenient for reasonable subsequent time arrangement. 3. The present invention obtains the remaining charging time of multiple historical charging cycles from the charging report of the charging pile, calculates the historical charging end time by summing the average value, extracts the charging current value within the historical charging end time range to construct a historical current change curve, divides the historical sub-curve, takes the mode of the number of charging current values ​​of each historical sub-curve to obtain the cycle window value, then takes the mode of all cycle window values ​​as the translation window value, and uses the translation window value as a reference to predict the charging end time using the window translation method, and combines the current charging time point to derive the estimated charging end time, reflecting the actual situation of the charging process, reducing the prediction error, and improving the reliability of the charging end time information provided to the user, so that the charging user can reasonably arrange the trip according to the estimated charging end time to avoid waiting for a long time or missing the charging completion time. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0010] Figure 1 This is a flow chart of a charging pile status prompt method of the present invention; Figure 2 It is a schematic diagram of a charging pile status prompt system of the present invention. DETAILED DESCRIPTION

[0011] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0012] Example 1 Figure 1 This is a flowchart of a charging pile status prompt method provided in the first embodiment of the present invention. This embodiment of the present invention can be applied to comprehensively evaluate whether the charging current change of the charging pile is stable when the charging pile is in the charging operation state. This charging pile status prompt method can be executed by a charging pile status prompt system. This charging pile status prompt system can be implemented by software and / or hardware. This charging pile status prompt system can be configured in a charging pile status prompt device. Optionally, a charging pile status prompt device can be an electronic device, which can be a laptop, desktop computer, smart tablet, etc. This embodiment of the present invention does not limit this.

[0013] like Figure 1 As shown, a charging pile status prompt method provided by an embodiment of the present invention specifically includes the following steps: Step 1: During the charging cycle, the current sensor is used to obtain charging current data in real time, wherein the charging current data includes the charging current value, and a change analysis is performed to obtain a change degree value and a change rate value. The change degree value and the change rate value are quantified to obtain a stability analysis value, which is compared with a stability analysis threshold to obtain a change stability signal; In some embodiments, the charging cycle is divided into a number of monitoring nodes, and the charging power values ​​corresponding to the monitoring nodes are obtained; It should be noted that the charging cycle is divided into equal time intervals, and the time intervals between adjacent monitoring nodes are equal; Calculate the ratio of the acquired charging current value to the rated charging current value to obtain the charging current ratio; According to the time series of the charging current ratio obtained by the current sensor in real time, the charging current ratio obtained during the charging cycle is integrated to obtain the current set ,in, It represents the charging current ratio obtained by the nth monitoring node; Combining adjacent charging current ratios in the current set into a unit amplitude group to obtain a plurality of unit amplitude groups; For example, the current is collected middle Form a group of unit amplitude groups and collect the current middle Form a group of unit amplitude groups and collect the current middle 、 Form a group of unit amplitude groups; Subtract the adjacent charging current ratios within the unit amplitude group, take the absolute value, and obtain the unit amplitude value; The unit amplitude values ​​corresponding to all unit amplitude groups are summed and averaged to obtain the degree of change value; During the charging cycle, adjacent monitoring nodes are combined into a unit duration group to obtain multiple unit duration groups; Obtain the time interval between adjacent monitoring nodes and calculate the ratio with the charging cycle duration to obtain the adjacent node duration; For example, the current sets are obtained respectively middle The corresponding monitoring node, The corresponding monitoring nodes are adjacent monitoring nodes, and the current sets are obtained respectively. middle The corresponding monitoring node, The corresponding monitoring nodes are adjacent monitoring nodes, and the current sets are obtained respectively. middle 、 The corresponding monitoring node, 、 The corresponding monitoring nodes are adjacent monitoring nodes; For any group of unit duration groups, the unit amplitude value corresponding to the unit amplitude group is calculated by the ratio with the adjacent node duration corresponding to the unit duration group to obtain the unit rapid change value; It should be noted that the unit duration group and the unit amplitude group are the same group; Substitute multiple element rapid change values ​​into the Euclidean calculation formula: , calculate the change rate value d, where, represents the mth unit rapid change value, Indicates the Unit rapid change value; Specifically, multiple unit rapid change values ​​are calculated using the Euclidean calculation formula to obtain a change rate value, thereby applying the principle of the Euclidean calculation formula itself to measure the straight-line distance between two points in a multidimensional space, and converting it into the degree of difference between two unit rapid change values, thereby achieving the measurement of the degree of discreteness between multiple unit rapid change values; The change rate value d is summed with the change degree value to obtain the stability analysis value; It can be understood that the meaning of the stability analysis value is to evaluate the change of charging current during the charging cycle. On the one hand, the degree change value reflects the amplitude change of charging current between different monitoring nodes, and on the other hand, the change rate value reflects the speed of charging current change, thereby analyzing whether the current change is stable. The predicted value is compared to the predicted threshold as follows: If the predicted analysis value is greater than the predicted analysis threshold, it means that the charging current varies greatly between different monitoring nodes and the charging current changes rapidly. A continue monitoring signal is generated to continue monitoring the charging current of the charging pile during the charging process until the charging current changes stabilize, and a change stability signal is generated. If the predicted analysis value is less than or equal to the predicted analysis threshold, it means that the amplitude change of the charging current between different monitoring nodes is relatively stable, and the charging current change is relatively stable, generating a stable change signal; The specific implementation scheme of the embodiment of the present invention is as follows: during the charging cycle, by analyzing the change of charging current data, a stable analysis value is obtained. The stable analysis value reflects the amplitude change of the charging current between different monitoring nodes and the speed of the charging current change. The stable charging current change is comprehensively evaluated when the charging pile is in the charging operation state, thereby determining whether the charging state has entered the constant voltage charging stage or the trickle charging stage. The charging status of the charging pile is then understood, and data support is provided for pushing the charging status of the charging pile to the charging user; Example 2 Step 2: Based on the change stability signal, a cycle analysis is performed on the charging current ratio within the charging cycle to obtain cycle analysis data, wherein the cycle analysis data includes adjacent quantity values ​​and adjacent change values. The adjacent quantity values ​​and adjacent change values ​​are quantized to obtain a cycle analysis value, and the value is compared with a cycle analysis threshold. If the cycle analysis value is less than or equal to the cycle analysis threshold, a cycle change signal is generated. In some embodiments, the charging current ratios corresponding to all monitoring nodes during the charging cycle are substituted into a two-dimensional coordinate system, where the X-axis represents time and the Y-axis represents the charging current value, to construct a current change curve; Divide the current change curve into several change sub-curves, obtain the number of charging current values ​​on the change sub-curve, and subtract the number of charging current values ​​on adjacent change sub-curves, take the absolute value, and obtain the numerical value difference; It should be noted that the current change curve is divided in the following way: all peak values ​​and trough values ​​on the current change curve are extracted, and the curve segment between adjacent peak values ​​and trough values ​​is used as a change sub-curve; Exemplarily, the current change curve is divided into five change sub-curves, namely, change sub-curve A, change sub-curve B, change sub-curve C, change sub-curve D and change sub-curve E; The intersection of the A and B change sub-curves can be a peak value or a trough value, the intersection of the B and C change sub-curves can be a peak value or a trough value, the intersection of the C and D change sub-curves can be a peak value or a trough value, and the intersection of the D and E change sub-curves can be a peak value or a trough value. Subtract the number of charging current ratios on the A change sub-curve from the number of charging current ratios on the B change sub-curve to obtain a numerical value difference; Subtract the number of charging current ratios on the B change sub-curve from the number of charging current ratios on the C change sub-curve to obtain a numerical difference; Subtract the number of charging current ratios on the C change sub-curve from the number of charging current ratios on the D change sub-curve to obtain a numerical difference; Subtract the number of charging current ratios on the D change sub-curve from the number of charging current ratios on the E change sub-curve to obtain a numerical difference; Calculate the sum and mean of all numerical quantity differences to obtain adjacent quantity values; Obtain the slope of the change sub-curve, calculate the variance of the slopes of adjacent change sub-curves, and obtain the change trend value; Exemplarily, the slope of the A-change sub-curve, the slope of the B-change sub-curve, the slope of the C-change sub-curve, the slope of the D-change sub-curve, and the slope of the E-change sub-curve are obtained, and the variance of the slopes of the A-change sub-curve, the B-change sub-curve, the C-change sub-curve, the D-change sub-curve, and the E-change sub-curve is calculated to obtain a sub-change trend value; Obtain the distance between the starting point and the end point of the change sub-curve, and calculate the ratio with the length of the current change curve to obtain the change sub-amplitude; It should be noted that the starting point of the change sub-curve can be a peak point, a trough point, or the starting point of the current change curve; The end point of the change sub-curve can be a peak point, a trough point, or the end point of the current change curve; Calculate the variance of all the change sub-amplitudes to obtain the change amplitude value; Sum the change trend value and the change amplitude value to obtain the adjacent change value; Sum the adjacent quantity values ​​and adjacent change values ​​to obtain the periodic analysis value; It can be understood that the meaning of the cycle analysis value is: a comprehensive summary of the quantity distribution, change trend and change amplitude of the charging current value on the current change curve during the charging cycle. Specifically, the adjacent quantity values ​​reflect the distribution dispersion of the quantity of charging current values ​​corresponding to different stages in the charging cycle, and the adjacent change values ​​reflect the change trend and the discrete degree of the change amplitude of the charging current values ​​corresponding to different stages in the charging cycle. This helps to indicate that the charging process of the charging system has entered a relatively stable and regular stage. It can further predict the remaining charging time and push it to the charging user in a timely manner, so that the charging user has a clear charging expectation of the charging time and is convenient for reasonable arrangement of subsequent time. The cycle analysis value is compared with the cycle analysis threshold value as follows: If the periodic analysis value is greater than the periodic analysis threshold, it indicates that the charging current ratio is unstable in quantity distribution, change trend and change amplitude, and a non-periodic change signal is generated; If the cycle analysis value is less than or equal to the cycle analysis threshold, it means that the charging current ratio is relatively stable in quantity distribution, change trend and change amplitude, and a cycle change signal is generated; The specific implementation method of the embodiment of the present invention is: periodically analyzing the charging current within the charging cycle to obtain a periodic analysis value, thereby reflecting the quantitative distribution, change trend and change amplitude of the charging current value on the current change curve within the charging cycle through the periodic analysis value, which is conducive to prompting the charging system that the charging process has entered a relatively stable and regular stage, and can further predict the remaining charging time, so as to push it to the charging user in a timely manner, so that the charging user has a clear charging expectation of the charging time, which is convenient for reasonable arrangement of subsequent time.

[0014] Example 3 Step 3: Based on the cycle change signal, the remaining charging time corresponding to multiple historical charging cycles is obtained through the charging pile charging report, and the historical charging end time is obtained by analysis and processing. Based on the historical charging end time, the charging current within the historical charging end time range is analyzed to obtain the shift window value, and the charging end time is predicted using the window shift method to obtain the estimated charging end time; In some embodiments, the remaining charging time corresponding to multiple historical charging cycles is obtained through the charging pile charging report, and the summed average is calculated to obtain the historical charging end time; Randomly select a historical charging cycle; Divide the historical charging cycle into several historical monitoring nodes; It should be noted that the historical charging cycle division method is consistent with the charging cycle division method; Extract the charging current values ​​corresponding to the historical monitoring nodes within the historical charging end time range from the charging pile charging report and substitute them into a two-dimensional coordinate system, with the X-axis being time and the Y-axis being charging current, to construct a historical current change curve; Divide the historical current change curve into a number of historical sub-curves, and obtain the number of charging current values ​​on the historical sub-curves; It should be noted that the historical sub-curve is divided as follows: Extract all historical peak values ​​and historical trough values ​​from the historical current change curve, and take the curve segment between adjacent historical peak values ​​and historical trough values ​​as a historical sub-curve; Integrate the number of charging current values ​​on all historical sub-curves to obtain a current value set, and extract the mode in the current value set as the period window value; Integrate the cycle window values ​​corresponding to all historical charging cycles to obtain a cycle window set, and extract the mode in the cycle window set as the translation window value; Based on the shifting window value, the charging end time within the charging cycle is predicted by the window shifting method. The process is as follows: S1, set the translation window value to the translation window of the window translation method; S2, obtains the charging current value during the charging cycle, using the formula: , calculate the predicted current value ,in, 、 and Expressed as the charging current value corresponding to the continuous monitoring node, It is represented as the charging current value corresponding to the dth monitoring node in the charging cycle, It is represented as the charging current value corresponding to the d+1th monitoring node in the charging cycle. It is represented as the charging current value corresponding to the d+2th monitoring node in the charging cycle, Represented as a translation window value; S3, obtain the capacity of the rechargeable battery and rechargeable battery capacity , the predicted current value , the rechargeable battery capacity and the rechargeable battery charged capacity are substituted into the formula: , calculate the estimated remaining charging time ; S4, obtain the current charging time point and compare it with the estimated remaining charging time Add them together to get the estimated charging end time; The specific implementation plan of the embodiment of the present invention is: obtaining the remaining charging time of multiple historical charging cycles from the charging report of the charging pile, obtaining the historical charging end time by summing the average value, extracting the charging current value within the historical charging end time range to construct a historical current change curve, dividing the historical sub-curve, taking the mode of the number of charging current values ​​of each historical sub-curve to obtain the cycle window value, and then taking the mode of all cycle window values ​​as the translation window value, using the translation window value as a reference, using the window translation method to predict the charging end time, and combining the current charging time point to obtain the estimated charging end time, reflecting the actual situation of the charging process, reducing the prediction error, and improving the reliability of the charging end time information provided to the user, so that the charging user can reasonably arrange the trip according to the estimated charging end time, and avoid waiting for a long time or missing the charging completion time.

[0015] Example 4 like Figure 2 As shown, an embodiment of the present invention provides a charging pile status prompt system, including the following modules: Change analysis module: During the charging cycle, the change degree value and change rate value are obtained and quantified to obtain the change stability signal; Periodic evaluation module: Based on the change stability signal, it obtains the adjacent quantity values ​​and adjacent change values, performs quantization processing, obtains the periodic analysis value, and generates the periodic change signal; Prediction end module: Based on the periodic change signal, the historical charging end time is obtained, the charging current within the historical charging end time range is analyzed, and the estimated charging end time is obtained.

[0016] The above formulas are all dimensionless and numerical calculations. The formulas are obtained by collecting a large amount of data and performing software simulation to obtain the most recent real situation. The preset parameters in the formulas are set by technicians in this field according to actual conditions.

[0017] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A charging pile status prompt method, characterized in that: The following steps are involved: During the charging cycle, the change degree value and the change rate value are obtained and quantified to obtain a change stability signal; Based on the changing stable signal, adjacent quantity values ​​and adjacent change values ​​are obtained, and quantized to obtain periodic analysis values, thereby generating a periodic change signal; Based on the periodic change signal, the historical charging end time is obtained, and the charging current within the historical charging end time range is analyzed to obtain the estimated charging end time.

2. A charging pile status prompt method according to claim 1, characterized in that: The degree of change value is obtained as follows: Divide the charging cycle into several monitoring nodes, obtain the charging power value corresponding to the monitoring node, and obtain the proportion of the charging rated current value to obtain the charging current ratio; Integrate the charge ratio into a current set , the current is collected The difference between adjacent charging current ratios is taken, the absolute value is taken, and the sum and average are calculated to obtain the change degree value.

3. A charging pile status prompt method according to claim 2, characterized in that: The change rate value is obtained as follows: Combining adjacent monitoring nodes into a unit duration group to obtain multiple unit duration groups; Obtain the time interval between adjacent monitoring nodes and calculate the ratio with the charging cycle duration to obtain the adjacent node duration; For any group of unit duration groups, the unit amplitude value corresponding to the unit amplitude group is calculated by the ratio with the adjacent node duration corresponding to the unit duration group to obtain the unit rapid change value; The change rate value d is obtained by calculating the multiple unit rapid change values ​​using the Euclidean formula.

4. A charging pile status prompt method according to claim 1, characterized in that: The generation process of the change stability signal is as follows: The change rate value d is summed with the change degree value to obtain the stability analysis value; If the predicted analysis value is less than or equal to the predicted analysis threshold, a change stability signal is generated.

5. A charging pile status prompt method according to claim 1, characterized in that: The process of obtaining adjacent quantity values ​​is as follows: Construct a current change curve and divide it into several change sub-curves, and subtract the number of charging current values ​​on adjacent change sub-curves to obtain the numerical difference; Calculate the sum and mean of all numerical differences to obtain adjacent numerical values.

6. A charging pile status prompt method according to claim 5, characterized in that: The process of obtaining adjacent change values ​​is as follows: Obtain the slope of the change sub-curve, calculate the variance of the slopes of adjacent change sub-curves, and obtain the change trend value; Get the distance between the starting point and the end point of the change sub-curve, calculate the proportion of the current change curve length occupied, and perform variance calculation to obtain the change amplitude value; The change trend value and the change amplitude value are summed to obtain the adjacent change value.

7. A charging pile status prompt method according to claim 1, characterized in that: The generation process of the periodic variation signal is as follows: Sum the adjacent quantity values ​​and adjacent change values ​​to obtain the periodic analysis value; If the period analysis value is less than or equal to the period analysis threshold, a period change signal is generated.

8. A charging pile status prompt method according to claim 1, characterized in that: The process of obtaining the estimated charging end time is as follows: Randomly select a historical charging cycle, construct a historical current change curve, and divide it into several historical sub-curves; Obtain the number of charging current values ​​on the historical sub-curve, integrate them, and extract the mode of the number of charging current values ​​as the cycle window value; The mode of all cycle window values ​​is extracted as the shift window value, and the estimated charging end time is obtained by the window shift method.

9. A charging pile status prompting device, applied to a charging pile status prompting method according to any one of claims 1 to 8, characterized in that: Including a charging pile status prompt system, wherein the charging pile status prompt system also includes the following modules: Change analysis module: During the charging cycle, the change degree value and change rate value are obtained and quantified to obtain the change stability signal; Periodic evaluation module: Based on the change stability signal, it obtains the adjacent quantity values ​​and adjacent change values, performs quantization processing, obtains the periodic analysis value, and generates the periodic change signal; Prediction end module: Based on the periodic change signal, the historical charging end time is obtained, the charging current within the historical charging end time range is analyzed, and the estimated charging end time is obtained.

10. A charging pile, characterized in that: The device comprises the charging pile status prompt device according to any one of claims 9.

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