Wiper control method and system and vehicle
By measuring the resistance of the wiper blades to identify stubborn stains and performing targeted wiping, the problem of low efficiency in removing stubborn stains by wipers is solved, achieving efficient cleaning and energy-saving effects.
Patent Information
- Application Number
- CN202410807646.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-20
- Publication Date
- 2025-12-23
AI Technical Summary
Existing windshield wipers are inefficient and power-consuming when removing stubborn stains on the windshield, and they easily wear out the wiper blades.
By measuring the actual resistance of the wiper during wiping, the location of stubborn stains can be identified and localized wiping can be performed. The stain area can be identified by the change in the driver current. The cleaning efficiency can be improved by combining water spraying and repeated wiping.
It improves the efficiency of cleaning stubborn stains on the windshield and reduces the wear and tear on the wiper blades and energy consumption.
Smart Images
Figure CN121180147A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of wiper control, in particular to a wiper control method, system and vehicle. BACKGROUND
[0002] Generally, a wiper is configured on a vehicle, and the wiper can be used to wipe rain, snow, mud and the like on the windshield, so that the driver's field of view is clear and driving safety is ensured. For the known wiper, during the driving of the vehicle, the driver can control the wiping speed of the wiper according to the real-time weather condition, for example, fast wiping when it rains heavily and slow wiping when it rains lightly. However, no matter fast wiping or slow wiping, each wiping is wiping the global wiping range defined by two limit positions of the wiper. When stubborn stains, such as mud, bird droppings and the like, appear on the windshield, it is difficult to remove them directly in a short time using global wiping, and the wiping efficiency is low, and global wiping also consumes more power and is more likely to cause damage to the wiper strip.
[0003] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY
[0004] According to different aspects, one of the purposes of the present application is how to more effectively wipe the stubborn stains on the windshield.
[0005] In addition, the present application also aims to solve or alleviate other technical problems existing in the prior art.
[0006] According to an aspect of the present application, there is provided:
[0007] A wiper control method, comprising the following steps:
[0008] corresponding to the position of the wiper, determining the actual wiping resistance of the wiper when moving in the initial wiping area;
[0009] determining the range of the wiper position where the actual wiping resistance is greater than the preset resistance threshold as the target wiping area;
[0010] controlling the wiper to perform concentrated wiping in the target wiping area.
[0011] According to another aspect of the present application, the present application provides a wiper control system, comprising:
[0012] a collection module corresponding to the position of the wiper, determining the actual wiping resistance of the wiper when moving in the initial wiping area;
[0013] a computing module, which determines a wiper position range in which the actual wiping resistance is greater than the preset resistance threshold as a target wiping area;
[0014] a control module, which controls the wiper to perform concentrated wiping in the target wiping area.
[0015] According to still another aspect of the present application, the present application provides a vehicle comprising the wiper control system described above.
[0016] Advantages of the present application include:
[0017] The wiper control method of the present application can accurately identify whether there is a stubborn stain on the windshield and identify the local area where the stubborn stain is located when the wiper performs global wiping, and then control the wiper to perform concentrated local wiping on the local area. This identification is achieved by measuring the change in wiper wiping resistance due to the obstruction of the wiper movement caused by the stain when the wiper wipes the stubborn stain, and further, the change in wiper driver current, on the one hand, high precision and strong reliability, on the other hand, simple and easy to implement, without other parameter acquisition and image recognition methods; Through the wiper control method, the stubborn stain on the windshield can be automatically wiped multiple times, improving the efficiency of cleaning the windshield, reducing the wear and aging of the wiper rubber strip, and saving the electrical energy consumed by the wiper. BRIEF DESCRIPTION OF DRAWINGS
[0018] The above and other features of the present application will become apparent from the following description of an embodiment thereof, taken in conjunction with the accompanying drawings, which show:
[0019] Figure 1 A flowchart showing a wiper control method according to one embodiment of an aspect of the present application is shown;
[0020] Figure 2 A schematic diagram showing the integral region obtained is shown;
[0021] Figure 3 A schematic diagram showing the integral region after the expansion process is shown;
[0022] Figure 4 A schematic diagram showing the integral region after the erosion process is shown;
[0023] Figure 5 A schematic diagram showing the structure of a wiper control system according to one embodiment of another aspect of the present application is shown. DETAILED DESCRIPTION
[0024] It is easy to understand that, according to the technical solutions of the present application, a person skilled in the art can propose various structural modes and implementation modes that can be replaced with each other without changing the essential spirit of the present application. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solutions of the present application, and should not be regarded as the whole or as a limitation or restriction on the technical solutions of the present application.
[0025] In the present specification, the orientation terms such as up, down, left, right, front, back, front surface, back surface, top, bottom, etc. mentioned or possibly mentioned are defined with respect to the configuration shown in the drawings, and they are relative concepts, so they can be changed accordingly according to different positions and different use states. Therefore, these or other orientation terms should not be interpreted as restrictive terms. In addition, the terms "first", "second", "third" or the like or similar expressions are only used for description and differentiation purposes, and cannot be understood as indicating or implying the relative importance of the corresponding members or the order or assembly order of the members.
[0026] Reference Figure 1 which shows a flowchart of a wiper control method according to one embodiment of an aspect of the present application, wherein S1-S3 respectively denote each step in the method. The wiper control method locks the area where the stubborn stain is located on the windshield by the change of the scraping resistance of the wiper when it passes through the stubborn stain, and performs local concentrated scraping on the area, so as to quickly and effectively remove the stubborn stain. The scraping resistance is represented by, for example, the current change of the driver, especially the driving motor, in the embodiments of the present application. The wiper control method in one embodiment of the present application includes the following steps:
[0027] S1: According to the position of the wiper, the actual scraping resistance of the wiper when moving in the initial scraping area is determined;
[0028] S2: The range of wiper positions where the actual scraping resistance is greater than the preset resistance threshold is determined as the target scraping area;
[0029] S3: Control the wiper to perform concentrated scraping in the target scraping area.
[0030] In step S1, the movement of the wiper in the initial scraping area is first performed, especially the global scraping of the wiper is performed, especially at least the wiper is moved from the initial position to the limit position, that is, the wiper can at least scrape all its scraping areas once, so as not to miss the stains that may exist on the windshield. It should be understood that the initial scraping area can also be specified by the user, for example, the user can specify the local area where the visible stubborn stain is located as the initial scraping area.
[0031] According to one embodiment of one aspect of the application, the actual wiping resistance is characterized by the current of the wiper drive, and the resistance threshold is determined based on the current of the wiper drive in the case that the initial wiping area is free of dirt.
[0032] Since the stubborn dirt, such as mud, bird droppings, etc., has a certain thickness, it will affect the movement of the wiper, especially hinder the movement of the wiper, increase the wiping resistance received by the wiper, and thus affect the current of the drive of the wiper, especially the drive motor, especially make the drive motor current larger in a short time and make the current fluctuate frequently. In this case, the actual wiping resistance is characterized by the actual function of the current of the wiper drive with respect to time, it can be determined that the current has an abnormal change characteristic in which time range within the time period when the wiper is in the initial wiping area, so as to infer that the wiper touches the dirt in the time range, and it can be further inferred that the wiper touches the dirt in which position range.
[0033] For the resistance threshold, it is characterized by a function of the current of the wiper drive with respect to time in the case that the initial wiping area is free of dirt. This function is referred to as a "reference function" below, and the reference function should be matched to the current working condition since the function of the drive current with respect to time is also different under different working conditions. After the actual function of the current of the drive motor with respect to time is determined, the corresponding preset reference function is extracted from the actual function, and the reference function represents the above-mentioned resistance threshold. The reference function is a standard function, which represents the function of the current of the drive with respect to time when the windshield is completely clean without dirt under the same working condition as the actual function (for example, including the same windshield dryness, the same vehicle speed, the same wiper movement speed). By comparing the actual function with the reference function, for example, usually subtracting the actual function from the reference function, especially subtracting the reference function from the actual function, the deviation function of the actual function and the reference function can be obtained, which reflects the influence of the dirt on the function of the current of the drive with respect to time, so as to further obtain the wiping time range corresponding to the position of the dirt, so as to further obtain the wiper position range of the dirt.
[0034] In one embodiment of the aspect of the application, the actual function and the reference function are both discrete functions obtained by normalizing the curve of the current of the driver with respect to time. The actual function and the reference function are not simply the continuous curve of the current of the driver with respect to time. For the curve of the current of the driver with respect to time, it needs to be normalized after being detected. Curve normalization is a common data processing method, which is used to adjust the curve to the same scale or the same range for easy comparison and analysis. By normalizing the actual function and the reference function, the actual function and the reference function which are the same in other influencing factors (such as the dry-wet coefficient of the windshield, especially the wiping position of the wiper on the windshield, etc.) and the numerical range (such as the time range unitization) can be formed, which is conducive to the subsequent comparison step. At the same time, through the normalization process, the time variable of each point in the actual function and the reference function can be matched with the position variable of the wiper, which is conducive to calculating the corresponding wiper position range in the time range where the actual function is greater than the reference function.
[0035] In one embodiment of the aspect of the application, the resistance threshold is calculated according to the vehicle speed, the dry-wet coefficient of the wiping position and / or the movement speed of the wiper.
[0036] In one embodiment of the aspect of the application, the dry-wet coefficient of the wiping position and / or the movement speed of the wiper is obtained according to the current of the driver when the wiper moves in the initial wiping area.
[0037] In this embodiment, the resistance threshold of the wiper is selected considering various factors affecting the wiping resistance of the wiper, i.e. the reference function is selected considering various factors affecting the current of the driver. Generally, there are three factors affecting the wiping resistance of the wiper, and thus the current of the driver, i.e. the vehicle speed, the dry-wet coefficient of the windshield and the moving speed of the wiper. When the vehicle speed is high, the moving speed of the wiper is affected due to the large air resistance of the vehicle. Therefore, generally, the wiping resistance of the wiper is larger and the current of the driver for driving the wiper to move at the same speed is larger when the vehicle speed is higher than when the vehicle speed is lower. When the windshield is dry, the wiping resistance of the wiper is larger and the current of the driver for driving the wiper is larger, and when the windshield is wet, the wiping resistance and the current are smaller. When the moving speed of the wiper is high, the wiping resistance of the wiper is larger and the current of the driver is larger, and when the moving speed of the wiper is low, the wiping resistance of the wiper is smaller and the current of the driver is smaller. The dry-wet coefficient and the moving speed of the wiper can be calculated from the variation characteristics of the actual wiping resistance, in particular, from the actual function, and the vehicle speed can be acquired by the vehicle speed sensor. For the case that the resistance threshold is represented by the reference function, a reference function group including a plurality of reference functions is provided, and the reference function corresponding to the current working condition can be selected from the reference function group by the three factors. In the reference function group, the functions of the current of the driver with respect to time under various working conditions are pre-stored, similar to a large number of characteristic curves. The reference function corresponding to the current working condition can be accurately selected from the reference function group (e.g. by table lookup or interpolation) by the fixed values of the factors.
[0038] In one embodiment of the aspect of the present application, determining the target wiping area comprises the following steps:
[0039] If the range of the wiper position where the actual wiping resistance is greater than the preset resistance threshold is distributed in discontinuous regions, the deviation function is integrated for each region, and the region with the largest integral value is taken as the target wiping area.
[0040] The deviation function is a function of the difference between the actual wiping resistance and the preset resistance threshold with respect to the wiper position.
[0041] When the wiper is wiping, the wiping resistance can vary with respect to the wiper position. When the resistance threshold has been determined, the range of the wiper position where the actual wiping resistance is greater than the resistance threshold can include multiple wiping regions. In this case, the deviation function can be obtained by subtracting the resistance threshold from the actual wiping resistance, and the deviation function is integrated in these regions respectively, and the region with the largest integral value is taken as the target wiping area.
[0042] When the actual wiping resistance and the resistance threshold are characterized by the actual function and the reference function of the driver current with respect to time, respectively, the deviation function is the difference function of the actual function and the reference function. At this time, for example, in an embodiment of the present application, if the deviation function is equal to 0 or completely less than a certain preset threshold, it can be considered that there is no deviation between the actual function and the reference function, i.e. there is no stubborn stain on the windshield, and the global wiping can continue. If the deviation function is not equal to 0 or greater than the above-mentioned preset threshold, it proves that the stubborn stain exists, at this time, the deviation function is further processed, for example, the deviation function is integrated with respect to time. Figure 2 which shows a schematic diagram of the obtained integral region. From Figure 2 It can be seen from that after the deviation function is integrated with respect to time, a plurality of discontinuous, polygonal integral regions are obtained. Generally, the larger the area of the integral region, the more intense or more persistent the change of the current when the wiper wipes in the time range corresponding to the integral region. Therefore, the integral region with the largest area can be selected, the wiping time range corresponding to the integral region is taken as the time range in which the stubborn stain exists, and the wiper position range is calculated based on the time range, because the integral region is likely to represent the position of the stain on the windshield that is most difficult to wipe clean. Of course, it can be understood that the wiper can also be controlled to sequentially wipe each target wiping region corresponding to the integral region, or to locally wipe the target wiping region corresponding to the integral region that exceeds the preset area threshold.
[0043] In an embodiment of one aspect of the present application, after the integral region of the deviation function is obtained by integrating the deviation function, the integral region is first dilated and eroded, and then the region with the largest integral value is selected.
[0044] From Figure 2 It can be seen from that in the case of generating a plurality of integral regions, the distance between some integral regions is very close, and the distance between some integral regions is far apart. At this time, if the integral region with the largest area is directly selected, the integral regions close to the integral region may be ignored, and there may be more stubborn stains in the target wiping region corresponding to these integral regions waiting to be wiped. In order to improve the wiping efficiency of the stains and strive to include as many stubborn stains as possible in one integral region, the integral region is additionally processed in this embodiment. First, the integral region is dilated. Reference is made to Figure 3 which shows a schematic diagram of the integral region after the dilatation processing. From Figure 3 It can be seen from that in the dilatation processing, the integral regions close to each other are connected together to form a larger integral region. After the dilatation processing, the integral region is eroded. Reference is made to Figure 4Fig. 6 is a schematic diagram showing the integral region after the erosion process, which shows that the erosion process removes the excess boundary of the integral region due to the expansion process, and the integral regions connected together during the expansion process are not separated, thus the closer integral regions are formed into a large integral region, which is equivalent to expanding the local concentrated wiping range, improving the wiping efficiency of the target wiping region where the stain is located, and being beneficial to improving the wiping effect.
[0045] In one embodiment of the aspect of the present application, after obtaining the deviation function, the deviation function is first filtered, and then integrated.
[0046] The deviation function is usually filtered, such as low-pass filtered, before being integrated, so as to filter out the noise or high-frequency signals in the collected data, so that the finally obtained deviation function is smoother and more stable, which is beneficial to the subsequent integration and expansion and erosion operations.
[0047] In one embodiment of the aspect of the present application, the concentrated wiping comprises:
[0048] controlling the water sprayer in the wiper to spray water into the target wiping region; and / or
[0049] the wiper repeatedly wipes in the target wiping region; and / or
[0050] The wiping speed is greater than the working speed of the wiper when the global wiping is performed, or the wiping speed is the maximum working speed of the wiper.
[0051] The characteristics of the concentrated wiping are given in this embodiment. In the concentrated wiping, the water spraying of the wiper can be used to change the dry-wet coefficient of the windshield, so as to reduce the resistance of the wiper, and make the stain easier to be removed. It should be understood that after the water spraying, the actual wiping resistance can be re-determined due to the change of the dry-wet coefficient, and the dry-wet coefficient of the windshield and the movement speed of the wiper are re-determined, so as to re-determine the resistance threshold, thereby updating the target wiping region. The concentrated wiping can usually adopt the form of reciprocating wiping, and the wiping speed of the concentrated wiping is usually greater than the wiping speed of the global wiping, especially the maximum working speed of the wiper, which improves the wiping effect compared with the global wiping, and is more beneficial to removing the stubborn stains with strong adhesion and difficult to wipe clean.
[0052] In one embodiment of the aspect of the present application, the wiper control method comprises the following steps:
[0053] re-determining the actual wiping resistance corresponding to the position of the wiper;
[0054] in response to the re-determined actual wiping resistance being not greater than the preset resistance threshold, exiting the concentrated wiping.
[0055] The embodiment proposes steps for exiting the concentrated wiping when the stubborn stain is eliminated by the concentrated wiping, which can be performed in real time or after the concentrated wiping lasts for a preset time. For example, when the wiper performs the concentrated wiping in the target wiping area, the actual wiping resistance of the wiper is also determined in real time. When the actual wiping resistance is determined to be not greater than the preset resistance threshold, it is proved that there is no stubborn stain on the windshield to apply additional resistance to the wiper at this time, and the concentrated wiping can be exited and enter into the normal global wiping mode or directly stop wiping.
[0056] Another aspect of the present application proposes a wiper control system. Referring to Figure 5 which shows a structural schematic diagram of a wiper control system according to one embodiment proposed by another aspect of the present application. The wiper control system 100 comprises:
[0057] The acquisition module 1 determines the actual wiping resistance of the wiper when the wiper moves in the initial wiping area according to the position of the wiper;
[0058] The calculation module 2 determines the range of wiper positions where the actual wiping resistance is greater than the preset resistance threshold as the target wiping area;
[0059] The control module 3 controls the wiper to perform concentrated wiping in the target wiping area.
[0060] In one embodiment of another aspect of the present application, the acquisition module 1 comprises a current sensor and a vehicle speed sensor.
[0061] In one embodiment of another aspect of the present application, the acquisition module 1 acquires the current of the wiper driver to represent the actual wiping resistance, and the resistance threshold is determined in the calculation module 2 according to the current of the wiper driver in the case of no stain in the initial wiping area.
[0062] In one embodiment of another aspect of the present application, the calculation module 2 calculates the resistance threshold according to the vehicle speed, the dry-wet coefficient of the wiping position and / or the movement speed of the wiper;
[0063] In one embodiment of another aspect of the present application, the dry-wet coefficient of the wiping position and / or the movement speed of the wiper is calculated and obtained according to the current of the driver of the wiper when the wiper moves in the initial wiping area.
[0064] In one embodiment of another aspect of the present application, the calculation module 2 responds to the range of wiper positions where the actual wiping resistance is greater than the preset resistance threshold distributed in discontinuous multiple areas, integrates the deviation function for each area, and takes the integral area with the largest integral value as the target wiping area;
[0065] The deviation function is a function of the difference between the actual wiping resistance and the preset resistance threshold with respect to the wiper position.
[0066] In one embodiment of the other aspect of the application, the calculation module 2 first performs inflation and erosion processing on the integral region of the deviation function after integrating the deviation function, and then selects the region with the largest integral value.
[0067] In one embodiment of the other aspect of the application, the calculation module 2 first performs filtering on the deviation function after obtaining the deviation function, and then integrates the deviation function.
[0068] In one embodiment of the other aspect of the application, the acquisition module 1 re-measures the actual wiping resistance corresponding to the wiper position in real time; the calculation module 2 calculates whether the re-measured actual wiping resistance is greater than the preset resistance threshold; and the control module 3 controls the wiper to exit the concentrated wiping in response to the re-measured actual wiping resistance not being greater than the preset resistance threshold.
[0069] In one embodiment of the other aspect of the application, the control mode of the wiper in the concentrated wiping includes:
[0070] controlling a water sprayer in the wiper to spray water into the target wiping area; and / or
[0071] controlling the wiper to perform multiple repeated wiping in the target wiping area; and / or
[0072] controlling the wiping speed of the wiper to be greater than the working speed of the wiper in the global wiping or setting the wiping speed to the maximum working speed of the wiper.
[0073] The application further provides a vehicle comprising the wiper control system described above, which has all the technical effects of the wiper control method described above, and thus will not be described here.
[0074] It should be understood that the wiper control system of the application can be installed on various vehicles, including cars, trucks, buses, hybrid electric vehicles, pure electric vehicles, etc. Therefore, the subject of the application also aims to protect various vehicles equipped with the wiper control system of the application.
[0075] It should be understood that all the above preferred embodiments are exemplary and not limiting, and various modifications or variations of the specific embodiments described above made by those skilled in the art under the concept of the application should be within the legal protection scope of the application.
Claims
1. A wiper control method, characterized in that, Includes the following steps: Corresponding to the wiper position, the actual wiping resistance of the wiper when it moves in the initial wiping area is measured; The range of wiper positions where the actual wiping resistance is greater than a preset resistance threshold is defined as the target wiping area. Control the wipers to perform concentrated wiping in the target wiping area.
2. The wiper control method according to claim 1, characterized in that, The actual wiping resistance is characterized by the current of the wiper driver, and the resistance threshold is determined based on the current of the wiper driver when there is no dirt in the initial wiping area.
3. The wiper control method according to claim 1, characterized in that, The resistance threshold is calculated based on vehicle speed, the wet / dry coefficient of the wiping location, and / or the speed of the wiper. The wet / dry coefficient of the wiping position and / or the movement speed of the wiper are calculated based on the current of the driver when the wiper moves in the initial wiping area.
4. The wiper control method according to claim 1, characterized in that, Determining the target scratch area involves the following steps: If the wiper positions where the actual wiping resistance is greater than the preset resistance threshold are distributed across multiple discontinuous areas, then the deviation function is integrated for each area, and the area with the largest integral value is taken as the target wiping area. The deviation function is a function of the difference between the actual wiping resistance and the preset resistance threshold with respect to the wiper position.
5. The wiper control method according to claim 4, characterized in that, After integrating the deviation function to obtain the integration region of the deviation function, the integration region is first subjected to dilation and erosion processing, and then the region with the largest integral value is selected.
6. The wiper control method according to claim 4, characterized in that, After obtaining the deviation function, the deviation function is first filtered, and then integrated.
7. The wiper control method according to claim 1, characterized in that, Includes the following steps: Re-measure the actual wiping resistance according to the wiper position; If the actual scraping resistance, as determined by remeasurement, is not greater than the preset resistance threshold, the concentrated scraping process is terminated.
8. The wiper control method according to claim 1, characterized in that, The concentrated scraping includes: Control the water sprayer in the wiper to spray water onto the target wiping area; and / or The wiper performs repeated wiping motions multiple times over the target wiping area; and / or The wiping speed is greater than the wiper's operating speed during full wiping, or the wiping speed is the wiper's maximum operating speed.
9. A wiper control system, characterized in that, include: The data acquisition module, corresponding to the position of the wiper, measures the actual wiping resistance of the wiper when it moves in the initial wiping area; The calculation module determines the target wiping area by the range of wiper positions where the actual wiping resistance is greater than a preset resistance threshold. The control module controls the wipers to perform concentrated wiping in the target wiping area.
10. A vehicle, characterized in that, Includes the wiper control system according to claim 9.