A detection method, system and storage medium for static current of a whole vehicle

Abstract

The present invention discloses a method, system and storage medium for detecting static current of a whole vehicle, comprising: obtaining multiple static current data groups; determining a regression equation between static current and current mileage based on the multiple static current data groups, and determining a determination coefficient based on the multiple static current data groups; determining a regression equation between static current and factory time based on the multiple static current data groups, and determining a determination coefficient based on the multiple static current data groups; obtaining the current mileage and factory time of the vehicle, and calculating the current static current threshold of the whole vehicle; obtaining the actual static current of the whole vehicle, and evaluating the actual static current of the whole vehicle based on the static current threshold of the whole vehicle; when the actual static current of the whole vehicle is less than or equal to the product of a preset error coefficient and the current static current threshold of the whole vehicle, judging that the actual static current of the whole vehicle is normal; when the actual static current of the whole vehicle is greater than the product of the preset error coefficient and the current static current threshold of the whole vehicle, judging that the actual static current of the whole vehicle is abnormal.

Description

Technical Field

[0001] The present invention relates to the technical field of whole vehicle static current detection, and in particular to a whole vehicle static current detection method, system and storage medium. Background Art

[0002] With technological advancements in the automotive industry, the electrical architecture of complete vehicles is becoming increasingly complex, and electrical interactions between components are becoming more frequent. This places higher demands on the capacity and lifespan of vehicle batteries. However, battery claims already account for a significant proportion of after-sales service, and this proportion is expected to continue to rise. Many battery damage cases are caused by excessive static current after the vehicle is turned off. This continuous power consumption leads to over-discharge, shortening the battery's service life. Proper monitoring of vehicle static current can facilitate timely analysis and prevent battery over-discharge.

[0003] Currently, there are no dedicated components in vehicles to detect static current. To measure static current, the only way is to manually disassemble the battery and connect an ammeter. Each measurement requires disassembly, which takes a long time. Furthermore, data is only available during the measurement process, often preventing access to sporadic static currents due to time constraints. Even if static current data is available, it's difficult to determine a reasonable static current threshold based on the vehicle's actual conditions. The adopted standard is relatively simple and has limited applicability.

[0004] When using a diagnostic instrument to read static current, the communication between the device and the vehicle causes static current fluctuations during the reading process, resulting in significant errors. Directly measuring static current with an ammeter is a complex process requiring the removal of the battery and fuse, and only provides static current values ​​over a period of time, making it impossible to measure occasional static current values. Currently, the static current threshold for the entire vehicle is determined using empirical values, which makes it difficult to determine a current threshold that is appropriate for the vehicle's actual conditions. Summary of the Invention

[0005] In order to solve at least one aspect of the above problems, the present invention provides a method for detecting the static current of a whole vehicle, comprising: obtaining multiple static current data groups, each of the static current data groups including static current, current mileage and factory time; determining a regression equation of static current and current mileage based on the multiple static current data groups, and determining a determination coefficient based on the multiple static current data groups; determining a regression equation of static current and factory time based on the multiple static current data groups, and determining a determination coefficient based on the multiple static current data groups; obtaining the current mileage and factory time of the target vehicle, and calculating the current static current threshold of the whole vehicle; obtaining the actual static current of the whole vehicle of the target vehicle, and evaluating the actual static current of the whole vehicle based on the static current threshold of the whole vehicle; when the actual static current of the whole vehicle is less than or equal to the product of a preset error coefficient and the current static current threshold of the whole vehicle, judging that the actual static current of the whole vehicle is normal; when the actual static current of the whole vehicle is greater than the product of the preset error coefficient and the current static current threshold of the whole vehicle, judging that the actual static current of the whole vehicle is abnormal.

[0006] Preferably, when the actual static current of the entire vehicle is abnormal, static current abnormality prompt information is output.

[0007] Preferably, the factory delivery time is the delivery calendar week when the static current is collected.

[0008] Preferably, the step of obtaining the actual static current of the target vehicle also includes: after collecting the preset time interval of the vehicle power-off, collecting multiple static currents of the vehicle at a preset period, the actual static current of the vehicle is equal to the average value of the multiple static currents of the vehicle.

[0009] Preferably, the preset time interval is 1 hour, and the preset period is 1 second.

[0010] Preferably, the preset error coefficient is 1.2.

[0011] On the other hand, a vehicle static current detection system is also provided, including: an acquisition and transmission module, the acquisition and transmission module includes an acquisition unit and a data transmission unit, the acquisition unit is used to acquire the vehicle current, and the data transmission unit is used to output the vehicle current; a calculation module, the calculation module receives the vehicle current through the acquisition and transmission module, and determines the actual static current of the vehicle based on the vehicle current, and the calculation module uses any of the above-mentioned vehicle static current detection methods to evaluate the actual static current of the vehicle.

[0012] Preferably, it also includes a reminder module, which includes an alarm unit and a display unit. The alarm unit outputs alarm information in response to the actual static current abnormality information of the whole vehicle, and the display unit outputs the actual static current of the whole vehicle and the current static current threshold of the whole vehicle in response to the actual static current abnormality information of the whole vehicle.

[0013] On the other hand, a computer storage medium is also provided, comprising a computer program, wherein when a processor runs the computer program, the computer program implements any of the above methods for detecting static current of a vehicle.

[0014] The vehicle static current detection method and system according to the embodiments of the present invention have the following beneficial effects: In the acquisition module, the present invention directly connects the measuring device to the battery. After installation, the vehicle has no impact, allowing the vehicle to continue normal use, achieving non-sensing measurement. Compared to other vehicle methods, only one installation is required for multiple measurements, saving measurement time. Furthermore, the acquisition module can monitor the static current value in real time, promptly monitoring the vehicle's static current status and identifying any problems immediately. In the calculation module, the present invention first verifies the correlation between the vehicle's current mileage and the calendar date of manufacture by calculating the Pearson coefficient. Then, a linear regression method is used for preliminary quantification, and the final expression is derived using the coefficient of determination as a weight. This clearly proposes a quantitative calculation method for the current static current of the entire vehicle, enabling differentiated monitoring of the value for each vehicle. This model fully considers the vehicle's usage and aging, conforms to actual conditions, and is highly operational. Furthermore, to eliminate model errors, a preset error coefficient is set when comparing the current actual static current with the model-predicted value. In the reminder module, the present invention displays the model-predicted static current value and the current actual static current value for the vehicle owner's reference. The vehicle owner can decide whether to perform maintenance. This is because in practice, many vehicle owners have installed other electrical appliances, which can cause the actual static current to be much greater than the model prediction. Based on this consideration, the present invention will eventually provide a reminder and display, but will not intervene in the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] To better understand the above and other objects, features, advantages, and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. Like reference numerals in the accompanying drawings refer to like components. Those skilled in the art should understand that the accompanying drawings are intended to schematically illustrate preferred embodiments of the present invention and have no limiting effect on the scope of the present invention. The components in the drawings are not drawn to scale.

[0016] Figure 1 A flow chart of a method for detecting static current of a vehicle according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0017] The following description of exemplary embodiments of the present disclosure is made in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding. These details should be considered as merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0018] As used herein, the term "including" and its variations represent open inclusion, i.e., "including but not limited to." Unless otherwise stated, the term "or" means "and / or." The term "based on" means "based at least in part on." The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment." The term "another embodiment" means "at least one additional embodiment." The terms "first," "second," etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0019] In order to at least partially solve one or more of the above problems and other potential problems, the embodiments of the present disclosure provide a method for detecting static current of a vehicle, such as Figure 1 As shown, it includes: step S1, obtaining multiple static current data groups, each static current data group includes static current, current mileage and factory time.

[0020] Specifically, the multiple static current data sets are static current data sets for vehicles in normal conditions. The current mileage in each static current data set is the mileage corresponding to the time the static current data set was collected. The factory date is the static current collection date minus the factory date. In some embodiments, the current mileage is processed to be an integer multiple of 100, specifically by rounding off the decimal point. In some embodiments, the factory date is the calendar week of the vehicle's departure when the static current data set was collected.

[0021] First, to determine the relationship between the current mileage and the vehicle's static current, it is necessary to calculate the Pearson coefficient between the current mileage and the vehicle's factory time and the vehicle's static current. The calculation formula is as follows:

[0022]

[0023] Among them, r is the Pearson coefficient, x i is the current mileage (or factory time) in the i-th static current data group, is the average value of the current mileage (or factory time) in the static current data group, y i is the static current in the i-th static current data set, is the average static current in the static current data set. The Pearson coefficient reflects the degree of linear correlation between two random variables and ranges from -1 to 1, with 0 representing no correlation, -1 representing a completely negative correlation, and 1 representing a completely positive correlation. The calculated Pearson coefficients for the current mileage and the vehicle's static current are both between 0 and 1, indicating a strong correlation with the vehicle's actual static current.

[0024] Step S2: Determine the regression equation between the static current and the current mileage based on the multiple static current data sets:

[0025] I M =ω1M+b1,

[0026] Among them, I M is the static current, M is the current mileage, and the determination coefficient is determined based on multiple static current data sets

[0027] Specifically, the regression coefficients ω1 and b1 are determined based on the static current and the current mileage in the multiple static current data sets. In some embodiments, the regression coefficients ω1 and b1 are calculated using the least squares method to find the best function matching of the data by minimizing the sum of squares of the errors to obtain the slope and intercept of the regression line equation, thereby obtaining a complete regression equation. Further, the judgment coefficient is calculated.

[0028]

[0029] in, is the current mileage M in the i-th static current data set i Substitute the predicted static current value calculated by the regression equation, I Mi is the static current value in the i-th static current data group, is the average value of the static current in n sets of static current data.

[0030] Step S3, determining the regression equation of static current and factory time based on multiple static current data sets:

[0031] I W =ω2W+b2,

[0032] Among them, I W is the static current, W is the factory time, and the determination coefficient is determined based on multiple static current data sets

[0033] Specifically, the regression coefficients ω2 and b2 are determined by the least square method based on the static current and factory duration in multiple static current data sets.

[0034]

[0035] in, is the factory duration W in the i-th static current data set i Substitute the predicted static current value calculated by the regression equation, I Wi is the static current value in the i-th static current data group, is the average value of the static current in n sets of static current data.

[0036] Step S4: Obtain the current mileage and factory time of the target vehicle and calculate the current vehicle static current threshold I t ,

[0037] I t =x M *(ω1M+b1)+x W *(ω2W+b2),

[0038] in,

[0039] Specifically, x M is the weight of the previous mileage regression equation, x W is the weight in the regression equation for the vehicle's factory age. The current mileage and factory age used to calculate the current vehicle static current threshold are the vehicle's mileage and factory age when the actual vehicle static current was collected in step 5. Furthermore, the mileage data is processed by rounding off to the nearest multiple of 100. The vehicle's factory age is subtracted from the measurement date to determine the vehicle's factory calendar day, which is then converted to a calendar week (i.e., factory age).

[0040] It is known that the regression coefficients ω1, b1, ω2, b2, and the judgment coefficient R have been determined based on multiple static current data sets. 2 M and R 2 W , bring the current mileage and factory time into the formula of the current vehicle static current threshold, and you can get the current vehicle static current threshold I corresponding to the actual vehicle static current t .

[0041] Step S5, obtaining the actual static current of the target vehicle, and based on the static current threshold value I t Evaluate the actual static current of the vehicle. When the actual static current of the vehicle is less than or equal to the product of the preset error coefficient and the current static current threshold of the vehicle, the actual static current of the vehicle is judged to be normal. When the actual static current of the vehicle is greater than the product of the preset error coefficient and the current static current threshold of the vehicle, the actual static current of the vehicle is judged to be abnormal.

[0042] Specifically, the step of obtaining the actual static current of the target vehicle also includes: after collecting the preset time interval when the vehicle is powered off, collecting multiple static currents of the vehicle at a preset period, and the actual static current of the vehicle is equal to the average value of the multiple static currents of the vehicle. For example, the preset time interval is 1 hour, and the preset period is 1s. One hour after the ignition switch is turned off, the current value is sampled at a period of 1s, and the average of 200 sampling periods is used as the actual static current of the vehicle. In other embodiments, the specific waiting time, sampling period, and number of samples can be set according to actual needs. It can be understood by those skilled in the art that there is no strict time definition standard for the static current of the vehicle, as long as the basic conditions of the static current are met.

[0043] In some embodiments, the preset error coefficient is 1.2.

[0044] Specifically, if I c ≤1.2I t , it indicates that the actual static current of the vehicle is within a reasonable range and no reminder is needed; if I c >1.2I t , it indicates that the actual static current of the vehicle is too large and needs attention. The calculation module will use the current static current threshold value I t The actual static electricity flow of the entire vehicle is transmitted to the reminder module.

[0045] In some embodiments, step S6 is further included, when the actual static current of the vehicle is abnormal, outputting static current abnormality prompt information.

[0046] Specifically, when the vehicle's actual static current is abnormal, the model-predicted and actual values ​​are displayed for the vehicle owner's reference. The vehicle owner can then decide whether to proceed with repairs. This is because, in practice, many vehicle owners install additional electrical appliances, which can cause the actual static current to be significantly greater than the model-predicted value. Based on this consideration, the present invention will ultimately provide a warning and display, but will not intervene in the vehicle.

[0047] This method first demonstrates the correlation between a vehicle's current mileage and its production date by calculating the Pearson coefficient. It then uses linear regression to quantify this correlation, and then uses the coefficient of determination as a weight to derive the final expression. This method clearly proposes a quantitative calculation method for the current static current of the entire vehicle, enabling differentiated monitoring of each vehicle's value. This model fully considers vehicle usage and aging, aligns with actual conditions, and offers high operability. Furthermore, to eliminate model errors, a preset error coefficient is used to calibrate the current static current threshold when comparing the actual static current to the model's predicted value.

[0048] On the other hand, a vehicle static current detection system is provided, including: an acquisition and transmission module, the acquisition and transmission module includes an acquisition unit and a data transmission unit, the acquisition unit is used to acquire the vehicle current, and the data transmission unit is used to output the vehicle current; a calculation module, the calculation module receives the vehicle current through the acquisition and transmission module, and determines the actual static current of the vehicle based on the vehicle current, and the calculation module uses any of the previous vehicle static current detection methods to evaluate the actual static current of the vehicle.

[0049] Specifically, the acquisition module is connected to the battery of the vehicle, and the actual static current I flowing out of the battery and into the vehicle can be collected in real time. c The current is measured by the static current measurement part, the minimum division value of the collection is 1mA, the collection time interval is 1s, and it works continuously. The data transmission unit transmits the collected current value to the calculation module. For example, the data transmission unit takes the average value of 200 sampling cycles after the ignition switch is turned off for 1 hour as the current static current value of the vehicle, and sends this value to the calculation module. After the installation of the acquisition module is completed, there is no impact on the vehicle. The vehicle can continue to be used normally, and non-sensing measurement can be achieved. Compared with other vehicle methods, only one installation is required for multiple measurements, which can save measurement time. Moreover, the acquisition module can monitor the static current value in real time, monitor the static current status of the vehicle in time, and detect problems at the first time. The static current of the entire electrical system of the vehicle is measured by connecting to the battery of the entire vehicle. This method is also applicable to the measurement of a single electrical system.

[0050] The calculation module calculates an average value based on the received static current values ​​to obtain the actual static current of the vehicle. Those skilled in the art will appreciate that the calculation module includes a formula for calculating the current static current threshold of the vehicle based on multiple static current data sets. In response to the determined actual static current of the vehicle, the calculation module obtains the current mileage and production date corresponding to the vehicle, and determines the current static current threshold of the vehicle based on the current mileage and production date. The actual static current of the vehicle is further evaluated based on the current static current threshold.

[0051] In some embodiments, a reminder module is also included, which includes an alarm unit and a display unit. The alarm unit outputs alarm information in response to the actual static current abnormality information of the whole vehicle, and the display unit outputs the actual static current of the whole vehicle and the current static current threshold of the whole vehicle in response to the actual static current abnormality information of the whole vehicle.

[0052] Specifically, the alarm unit uses a speaker or a diode, or a combination thereof, and outputs the alarm information through audio, light, text, or graphics. The display unit uses a display to output and display the actual static current of the vehicle and the current static current threshold of the vehicle.

[0053] A computer-readable storage medium is also provided, comprising a computer program. When executed by a processor, the computer program implements any of the above methods for detecting static current of a vehicle. The method for detecting static current of a vehicle comprises: obtaining multiple static current data sets; determining a regression equation between static current and current mileage based on the multiple static current data sets, and determining a determination coefficient based on the multiple static current data sets; determining a regression equation between static current and factory time based on the multiple static current data sets, and determining a determination coefficient based on the multiple static current data sets; obtaining the current mileage and factory time of the vehicle, and calculating the current static current threshold of the vehicle; obtaining the actual static current of the vehicle, and evaluating the actual static current of the vehicle based on the static current threshold of the vehicle; determining that the actual static current of the vehicle is normal when the actual static current of the vehicle is less than or equal to the product of a preset error coefficient and the current static current threshold of the vehicle; and determining that the actual static current of the vehicle is abnormal when the actual static current of the vehicle is greater than the product of the preset error coefficient and the current static current threshold of the vehicle.

[0054] While various embodiments of the present disclosure have been described above, the foregoing description is intended to be illustrative, non-exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable others skilled in the art to understand this document.

Claims

1. A method for detecting static current of a vehicle, characterized in that: include: Acquire multiple static current data sets, each of which includes static current, current mileage, and factory time; The regression equation between the static current and the current mileage is determined based on the multiple static current data sets: ， Among them, I M is the static current, M is the current mileage, and the determination coefficient is determined based on multiple static current data sets , ， in, is the current mileage M in the i-th static current data set i Substitute the predicted static current value obtained by the regression equation into the equation. is the static current value in the i-th static current data group, is the average value of the static current in n groups of static current data; The regression equation between static current and factory time is determined based on the multiple static current data sets: ， Among them, I W is the static current, W is the factory time, and the determination coefficient is determined based on multiple static current data sets , ， in, is the factory duration W in the i-th static current data set i Substitute the predicted static current value obtained by the regression equation into the equation. is the static current value in the i-th static current data group, is the average value of the static current in n groups of static current data; Get the current mileage and factory time of the target vehicle and calculate the current static current threshold of the vehicle , ， in, , ; Obtain the actual static current of the target vehicle and calculate the static current threshold value of the vehicle based on the static current threshold value. Evaluate the actual static current of the whole vehicle. When the actual static current of the whole vehicle is less than or equal to the product of the preset error coefficient and the current static current threshold of the whole vehicle, judge that the actual static current of the whole vehicle is normal. When the actual static current of the whole vehicle is greater than the product of the preset error coefficient and the current static current threshold of the whole vehicle, judge that the actual static current of the whole vehicle is abnormal.

2. The method according to claim 1, characterized in that When the actual static current of the entire vehicle is abnormal, a static current abnormality prompt message is output.

3. The method according to claim 1, characterized in that The factory delivery time is the factory delivery calendar week when the static current is collected.

4. The method according to claim 3, characterized in that The step of obtaining the actual static current of the target vehicle also includes: after collecting the preset time interval of the vehicle power-off, collecting multiple static currents of the vehicle at a preset period, the actual static current of the vehicle is equal to the average value of the multiple static currents of the vehicle.

5. The method according to claim 4, characterized in that The preset time interval is 1 hour, and the preset period is 1 second.

6. The method according to claim 1, wherein The preset error coefficient is 1.

2.

7. A vehicle static current detection system, characterized in that: include: An acquisition and transmission module, comprising an acquisition unit and a data transmission unit, wherein the acquisition unit is used to acquire the vehicle current and the data transmission unit is used to output the vehicle current; A calculation module, wherein the calculation module receives the vehicle current through the acquisition and transmission module, and determines the actual static current of the vehicle based on the vehicle current, and the calculation module uses the vehicle static current detection method according to any one of claims 1 to 6 to evaluate the actual static current of the vehicle.

8. The system according to claim 7, characterized in that It also includes a reminder module, which includes an alarm unit and a display unit. The alarm unit outputs alarm information in response to the actual static current abnormality information of the whole vehicle, and the display unit outputs the actual static current of the whole vehicle and the current static current threshold of the whole vehicle in response to the actual static current abnormality information of the whole vehicle.

9. A computer-readable storage medium, characterized in that It includes a computer program, which, when executed by a processor, implements the method for detecting static current of a vehicle as described in any one of claims 1 to 6.

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