Overcharge direct current metering system based on dynamic error correction

Abstract

The invention relates to the technical field of direct current metering systems, in particular to an overcharge direct current metering system based on dynamic error correction, which comprises a current measurement module, a current fluctuation period experiment module, an information storage module, a service time statistics module, a control module and a communication module, the current measurement module is used for measuring and obtaining an original current measurement value; the current fluctuation period experiment module is used for testing and obtaining a maximum current value in a current fluctuation period experiment, a minimum current value in the current fluctuation period experiment and a current value sampled each time in the current fluctuation period experiment; the information storage module is used for storing the bandwidth of the sensor and the sampling precision of the sensor; the use time counting module is used for counting and obtaining the total use time length of the sensor; the control module obtains a current correction index factor. The system comprehensively considers various factors, instability caused by external factors or sensor performance changes is reduced, and the overall detection precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of direct current metering systems, and in particular to a supercharging direct current metering system based on dynamic error correction. Background Art

[0002] Supercharging generally refers to a fast charging technology that uses high-power charging piles, charging stations, or chargers to charge a large amount of electricity into the battery in a relatively short period of time, thereby significantly shortening the charging time. The most significant feature of supercharging is the use of high-power charging equipment, which can generally provide much higher charging power than traditional home chargers. For example, traditional home chargers are usually around a few kilowatts (kW), while supercharging equipment can generally provide more than 150kW or even higher power. High-power charging allows the battery to be charged in a shorter period of time, such as charging to 80% in 30 minutes, greatly shortening the charging time of several hours required by traditional charging methods.

[0003] The application document with publication number CN116505633A discloses a control system, method, charger, and storage medium for a charger. The system includes: an acquisition device for collecting AC side current data, AC side voltage data, DC side current data, and DC side voltage data of the charger; an energy metering chip connected to the acquisition device, for calculating AC side power based on the AC side current data and AC side voltage data, and for calculating DC side power based on the DC side current data and DC side voltage data; a controller connected to the energy metering chip, for calculating the power consumption of the charger based on the AC side power and the DC side power, and when it is determined that the power consumption exceeds a preset power consumption threshold, obtaining a target charging strategy and controlling the charging of the charger according to the target charging strategy, wherein the target charging strategy is generated based on the power consumption exceeding the preset power consumption threshold and its corresponding charging mode.

[0004] The prior art provides a method for power consumption management. However, the impact of overcharging on data accuracy is not taken into account during the calculation process of power consumption management, which leads to a decrease in the accuracy of detection data. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned shortcomings and propose a supercharging DC metering system based on dynamic error correction.

[0006] The present invention adopts the following technical solutions:

[0007] A supercharging DC metering system based on dynamic error correction, the system comprising a current measurement module, a current fluctuation cycle experiment module, an information storage module, a usage time statistics module, a control module and a communication module; the current measurement module is used to measure and obtain the original current measurement value, and transmit it to the control module; the current fluctuation cycle experiment module is used to test and obtain the maximum current value, the minimum current value and the current value of each sampling in the current fluctuation cycle experiment, and transmit them to the control module; the information storage module is used to store the bandwidth of the sensor and the sampling accuracy of the sensor, and transmit them to the control module; the usage time statistics module is used to count and obtain the total usage time of the sensor, and transmit it to the control module; the control module obtains a current correction index factor based on data obtained by the current measurement module, the current fluctuation cycle experiment module, the information storage module and the usage time statistics module, and transmits the current correction index factor to the communication module; the communication module transmits the current correction index factor to the user end.

[0008] Optionally, the control module obtains the total number of samples based on the bandwidth of the sensor and the sampling accuracy of the sensor, obtains the noise impact index based on the total number of samples, the current value of each sample in the current fluctuation cycle experiment, the maximum current value in the current fluctuation cycle experiment, and the minimum current value in the current fluctuation cycle experiment, obtains the average current value in the current fluctuation cycle experiment based on the current value of each sample in the current fluctuation cycle experiment and the total number of samples, obtains the current fluctuation correction index based on the maximum current value in the current fluctuation cycle experiment, the minimum current value in the current fluctuation cycle experiment, and the average current value in the current fluctuation cycle experiment, obtains the current correction index factor based on the original current measurement value, the noise impact index, the current fluctuation correction index, the average current value in the current fluctuation cycle experiment, and the total usage time of the sensor, and transmits the current correction index factor to the communication module.

[0009] Optionally, the current fluctuation cycle experiment module includes a fluctuation analysis submodule and a current screening submodule; the fluctuation analysis submodule is used to collect current data and analyze the current fluctuation cycle, obtain the current value of each sampling in the current fluctuation cycle experiment, and transmit the current value of each sampling in the current fluctuation cycle experiment to the control module and the current screening submodule; the current screening submodule obtains the maximum current value in the current fluctuation cycle experiment and the minimum current value in the current fluctuation cycle experiment based on the current value of each sampling in the current fluctuation cycle experiment, and transmits them to the control module.

[0010] Optionally, the usage time statistics module includes a running time monitoring submodule and an operation submodule; the running time monitoring submodule is used to monitor the operating status of the sensor and record the start time and stop time of the sensor, and transmit the start time and stop time to the operation submodule; the operation submodule calculates the total usage time of the sensor based on the start time and stop time, and transmits it to the control module.

[0011] Optionally, when the control module calculates the current correction index factor, the following formula is satisfied:

[0012]

[0013] Among them, I corr is the current correction factor, I raw is the original measured value of current, ZS is the noise impact index, BD is the current fluctuation correction index, I avg is the average current value in the current fluctuation cycle experiment, T is the total time the sensor is used; i max is the maximum current value in the current fluctuation cycle experiment, i min is the minimum current value in the current fluctuation cycle experiment.

[0014] The beneficial effects achieved by the present invention are:

[0015] 1. The system comprehensively considers factors such as current fluctuations, sensor performance changes, and usage time, and can dynamically adapt to various environmental changes and charging conditions, reducing instability caused by external factors or sensor performance changes and improving overall detection accuracy;

[0016] 2. The system calculates the current correction factor through multiple data sources (such as current measurement, fluctuation period, sensor performance, usage time, etc.) to ensure that the current correction factor is accurate and highly adaptable.

[0017] To further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and explanation and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic structural diagram of the current fluctuation period experiment module in the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of a practical time statistics module in the present invention;

[0021] Figure 4It is the effect diagram of the present invention;

[0022] Figure 5 This is a schematic diagram of the overall structure of embodiment 2 of the present invention. DETAILED DESCRIPTION

[0023] The following is an explanation of the embodiments of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed based on different viewpoints and applications without departing from the spirit of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations and are not depicted according to actual dimensions. It is stated in advance. The following embodiments will further explain the relevant technical contents of the present invention in detail, but the disclosed contents are not intended to limit the scope of protection of the present invention.

[0024] Example 1: This example provides a supercharge DC metering system based on dynamic error correction, combined with Figures 1 to 4 shown.

[0025] A supercharging DC metering system based on dynamic error correction, the system comprising a current measurement module, a current fluctuation cycle experiment module, an information storage module, a usage time statistics module, a control module and a communication module; the current measurement module is used to measure and obtain the original current measurement value, and transmit it to the control module; the current fluctuation cycle experiment module is used to test and obtain the maximum current value, the minimum current value and the current value of each sampling in the current fluctuation cycle experiment, and transmit them to the control module; the information storage module is used to store the bandwidth of the sensor and the sampling accuracy of the sensor, and transmit them to the control module; the usage time statistics module is used to count and obtain the total usage time of the sensor, and transmit it to the control module; the control module obtains a current correction index factor based on data obtained by the current measurement module, the current fluctuation cycle experiment module, the information storage module and the usage time statistics module, and transmits the current correction index factor to the communication module; the communication module transmits the current correction index factor to the user end.

[0026] Optionally, the control module obtains the total number of samples based on the bandwidth of the sensor and the sampling accuracy of the sensor, obtains the noise impact index based on the total number of samples, the current value of each sample in the current fluctuation cycle experiment, the maximum current value in the current fluctuation cycle experiment, and the minimum current value in the current fluctuation cycle experiment, obtains the average current value in the current fluctuation cycle experiment based on the current value of each sample in the current fluctuation cycle experiment and the total number of samples, obtains the current fluctuation correction index based on the maximum current value in the current fluctuation cycle experiment, the minimum current value in the current fluctuation cycle experiment, and the average current value in the current fluctuation cycle experiment, obtains the current correction index factor based on the original current measurement value, the noise impact index, the current fluctuation correction index, the average current value in the current fluctuation cycle experiment, and the total usage time of the sensor, and transmits the current correction index factor to the communication module.

[0027] Optionally, the current fluctuation cycle experiment module includes a fluctuation analysis submodule and a current screening submodule; the fluctuation analysis submodule is used to collect current data and analyze the current fluctuation cycle, obtain the current value of each sampling in the current fluctuation cycle experiment, and transmit the current value of each sampling in the current fluctuation cycle experiment to the control module and the current screening submodule; the current screening submodule obtains the maximum current value in the current fluctuation cycle experiment and the minimum current value in the current fluctuation cycle experiment based on the current value of each sampling in the current fluctuation cycle experiment, and transmits them to the control module.

[0028] Optionally, the usage time statistics module includes a running time monitoring submodule and an operation submodule; the running time monitoring submodule is used to monitor the operating status of the sensor and record the start time and stop time of the sensor, and transmit the start time and stop time to the operation submodule; the operation submodule calculates the total usage time of the sensor based on the start time and stop time, and transmits it to the control module.

[0029] Optionally, when the control module calculates the current correction index factor, the following formula is satisfied:

[0030]

[0031] Among them, I corr is the current correction factor, I raw is the original measured value of current, ZS is the noise impact index, BD is the current fluctuation correction index, I avg is the average current value in the current fluctuation cycle experiment, T is the total time the sensor is used; i max is the maximum current value in the current fluctuation cycle experiment, i min is the minimum current value in the current fluctuation cycle experiment.

[0032] Optionally, the control module satisfies the following formula during calculation:

[0033]

[0034] Where N is the total number of samples, i n is the current value sampled for the nth time in the current fluctuation cycle experiment;

[0035] dk is the bandwidth of the sensor, and jd is the sampling accuracy of the sensor.

[0036] Optionally, when the control module calculates the current correction index factor, refer to the following program code:

[0037]

[0038]

[0039]

[0040] Specifically, when calculating the current correction factor, by observing the formula, it can be seen that the current correction factor is greater than the original current measurement value. The reason is: in supercharging mode, the current often changes rapidly (for example, current fluctuations during high-power fast charging). If the original measurement signal is affected by the following, the current is often underestimated. For example, the delay effect (hysteresis effect): due to the limited response time of the sensor or the long sampling period, the rapid change of the current may not be captured in time. When the current rises sharply, the sensor and sampling system may lag and fail to accurately reflect the true instantaneous current, resulting in a smaller measured current; noise interference suppression: Some current sensors filter current fluctuations to reduce noise interference. However, this filtering may cause rapid current fluctuations to be attenuated, resulting in the measured value being lower than the actual current value; calculation of current fluctuation amplitude: in the case of severe current fluctuations, the sensor may not be able to accurately capture the peak or extreme value of the current at certain moments, especially when the current changes sharply in a short period of time, which will cause the measured current value to be lower than the actual value. In this example, current overestimation is ignored for the following reasons: The conservative nature of sensor design: Most current sensors incorporate certain protection mechanisms during design to ensure that the measured value does not exceed the device's measurement range due to overload; The natural tendency of measurement error: For sensors, errors typically exhibit a certain random distribution. In dynamic signals, sensors are more susceptible to short-term current fluctuations, noise, and hysteresis, leading to underestimation; The short-term polarity of current fluctuations: In rapidly fluctuating current signals, due to the sudden rise or fall of the current, the sensor is more likely to miss the peak value rather than over-amplify it during sampling, resulting in underestimation rather than over-estimation during fluctuations.

[0041] Therefore, the current correction index factor is calculated to compensate for the deficiency that the current sensor may not be able to accurately capture the true current value in some cases. In actual application, the original current measurement value is replaced by the current correction index factor to improve the detection accuracy.

[0042] The units of the original current measurement value, the average current value in the current fluctuation cycle experiment, the maximum current value in the current fluctuation cycle experiment, the minimum current value in the current fluctuation cycle experiment, and the current value sampled each time in the current fluctuation cycle experiment are all amperes; the current fluctuation cycle experiment refers to a fluctuation experiment performed before the measurement of the "original current measurement value", and a fixed value period is selected in the experiment, for example, 1 second, and then the test is performed within this fixed value period and the relevant data is recorded to obtain the corresponding maximum current value in the current fluctuation cycle experiment, the minimum current value in the current fluctuation cycle experiment, and the current value sampled each time in the current fluctuation cycle experiment; the unit of the total usage time of the sensor is hours, and the sensor refers to the sensor for testing current; the unit of the bandwidth of the sensor is hertz, and the sensor refers to the sensor for testing current, and the bandwidth of the sensor can be learned by querying the data; the unit of the sampling accuracy of the sensor is seconds, and the sensor refers to the sensor for testing current, and the sampling accuracy of the sensor can be learned by querying the data.

[0043] The above units are only examples, and those skilled in the art may set different units according to actual needs when implementing this solution.

[0044] This embodiment solves the problem of low detection accuracy in traditional metering systems. The system comprehensively considers factors such as current fluctuations, sensor performance changes, and usage time. It can dynamically adapt to various environmental changes and charging conditions, avoid instability caused by external factors or changes in sensor performance, and improve overall detection accuracy.

[0045] Example 2: This example includes all the contents of Example 1, and provides a supercharge DC metering system based on dynamic error correction, combined with Figure 5 shown.

[0046] A supercharging DC metering system based on dynamic error correction, the system also includes a testing module and a determination module;

[0047] The test module is used to test and obtain the sensor response rise time and sensor response fall time, and transmit them to the control module;

[0048] The control module obtains the sensor working index according to the current correction index factor, the original current measurement value, the sensor response rise time and the sensor response fall time, and transmits the sensor working index to the determination module;

[0049] The determination module obtains information on whether the sensor is working stably according to the sensor working index, and transmits the information on whether the sensor is working stably to the user end.

[0050] Specifically, when the judgment module is working, the following judgment principle is referred to: when the sensor working index is greater than or equal to the selection threshold of the sensor working index, it indicates that the sensor is working unstable; when the sensor working index is less than the selection threshold of the sensor working index, it indicates that the sensor is working stably; the selection threshold of the sensor working index is set by those skilled in the art, and based on the information obtained that the sensor is working unstable, the use of the sensor can be suspended or the sensor can be repaired.

[0051] Optionally, when the control module calculates the sensor working index, the following formula is satisfied:

[0052]

[0053] Among them, E is the sensor working index, t rise is the sensor response rise time, t fall is the sensor response fall time.

[0054] Optionally, when the control module calculates the sensor working index, refer to the following program code:

[0055]

[0056] Specifically, when calculating the working indicators of the sensor, the sensor refers to the sensor of the test current; the units of the sensor response rise time and the sensor response fall time are both seconds; the sensor response rise time refers to the time required for the sensor output to increase from 10% to 90% of the maximum value. It is usually used to measure the speed at which the sensor responds when the signal suddenly increases. The following measurement method is provided: the sensor is stimulated by a known current signal, and the amplitude of the signal increases rapidly from 0 to a preset maximum value (for example, from 0A to 10A). An oscilloscope or other suitable equipment is used to record the output voltage or current response of the sensor. The time axis of the oscilloscope should be fine enough to capture the fast response of the sensor. For example, observe the change process of the sensor output signal from 10% to 90%. Assuming that the maximum value of the output signal is vmax, the corresponding maximum value of 10% is 0.1*vmax, the corresponding maximum value of 90% is 0.9vmax, and the corresponding 0.1*vmax to 0.9vm The time required for ax is the corresponding sensor response rise time; the sensor response fall time refers to the time required for the sensor output to decrease from 90% to 10% of the maximum value. It is usually used to measure the speed at which the sensor responds when the signal suddenly decreases. The following measurement method is provided: the sensor is stimulated by a known current signal, and the amplitude of the signal rapidly decreases from the maximum value to 0 (for example, from 10A to 0A). Use an oscilloscope or other suitable equipment to record the output voltage or current response of the sensor. For example, observe the change process of the sensor output signal from 90% to 10%. Assuming that the maximum value of the output signal is vmax, the corresponding maximum value of 10% is 0.1*vmax, and the corresponding maximum value of 90% is 0.9vmax. The time required from 0.9vmax to 0.1*vmax is the corresponding sensor response fall time; when the ratio of the sensor response rise time to the sensor response fall time is larger, it means that the sensor responds to the signal relatively slowly.

[0057] The above units are only examples, and those skilled in the art may set different units according to actual needs when implementing this solution.

[0058] This embodiment solves the problem of the singleness of the traditional metering system. By dynamically calculating the working indicators of these sensors, the control module can make real-time adjustments based on the actual working status, optimize the current correction strategy, and ensure the accuracy of the charging process.

[0059] The contents disclosed above are only preferred feasible embodiments of the present invention and do not limit the scope of protection of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention description and drawings are included in the scope of protection of the present invention. In addition, the elements therein can be updated as technology develops.

Claims

1. A supercharging DC metering system based on dynamic error correction, characterized in that: The system includes a current measurement module, a current fluctuation period experiment module, an information storage module, a usage time statistics module, a control module and a communication module; The current measurement module is used to measure and obtain the original current measurement value and transmit it to the control module; The current fluctuation period experiment module is used to test and obtain the maximum current value, the minimum current value and the current value of each sampling in the current fluctuation period experiment, and transmit them to the control module; The information storage module is used to store the bandwidth of the sensor and the sampling accuracy of the sensor, and transmit them to the control module; The usage time statistics module is used to count and obtain the total usage time of the sensor and transmit it to the control module; The control module obtains the current correction index factor based on the data obtained by the current measurement module, the current fluctuation period experiment module, the information storage module and the usage time statistics module, and transmits the current correction index factor to the communication module; The communication module transmits the current correction index factor to the user end.

2. A supercharge DC metering system based on dynamic error correction according to claim 1, characterized in that: The control module obtains the total number of samples based on the bandwidth of the sensor and the sampling accuracy of the sensor, obtains the noise influence index based on the total number of samples, the current value of each sample in the current fluctuation cycle experiment, the maximum current value in the current fluctuation cycle experiment and the minimum current value in the current fluctuation cycle experiment, obtains the average current value in the current fluctuation cycle experiment based on the current value of each sample in the current fluctuation cycle experiment and the total number of samples, obtains the current fluctuation correction index based on the maximum current value in the current fluctuation cycle experiment, the minimum current value in the current fluctuation cycle experiment and the average current value in the current fluctuation cycle experiment, obtains the current correction index factor based on the original current measurement value, the noise influence index, the current fluctuation correction index, the average current value in the current fluctuation cycle experiment and the total duration of sensor use, and transmits the current correction index factor to the communication module.

3. A supercharge DC metering system based on dynamic error correction according to claim 2, characterized in that: The current fluctuation period experiment module includes a fluctuation analysis submodule and a current screening submodule; The fluctuation analysis submodule is used to collect current data and analyze the current fluctuation period, obtain the current value of each sampling in the current fluctuation period experiment, and transmit the current value of each sampling in the current fluctuation period experiment to the control module and the current screening submodule; The current screening submodule screens the current value sampled each time in the current fluctuation period experiment to obtain the maximum current value and the minimum current value in the current fluctuation period experiment, and transmits them to the control module.

4. A supercharge DC metering system based on dynamic error correction as claimed in claim 3, characterized in that: The usage time statistics module includes a running time monitoring submodule and a calculation submodule; The operating time monitoring submodule is used to monitor the operating status of the sensor and record the start time and stop time of the sensor, and transmit the start time and stop time to the calculation submodule; The operation submodule calculates the total usage time of the sensor according to the start time and the stop time, and transmits the result to the control module.

5. The supercharging DC metering system based on dynamic error correction according to claim 4, characterized in that: When the control module calculates the current correction index factor, the following formula is satisfied: Among them, I corr is the current correction factor, I raw is the original measured value of current, ZS is the noise impact index, BD is the current fluctuation correction index, I avg is the average current value in the current fluctuation cycle experiment, and T is the total time the sensor is used; i max is the maximum current value in the current fluctuation cycle experiment, i min is the minimum current value in the current fluctuation cycle experiment.

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