Tire size updating method, device, vehicle and storage medium

Abstract

The present application discloses a tire size update method, device, vehicle and storage medium, belonging to the field of vehicle technology. It includes: obtaining the reference speed of the target vehicle at the i-th moment, the reference speed includes the first speed obtained based on the acceleration of the target vehicle and / or the second speed obtained based on the positioning component of the target vehicle; determining the credibility of the reference speed corresponding to the target time period based on the third speed of the target vehicle at multiple moments and the reference speed, the third speed is the speed calculated based on the wheel speed of the target vehicle; when the credibility of the reference speed corresponding to the target time period meets the credibility condition, based on the speed difference between the reference speed at multiple moments and the third speed and the wheel speed of the target vehicle, the tire size of the target vehicle is updated. The present application can automatically update the tire size of the vehicle after the tire is replaced, thereby saving labor costs and time costs and improving tire replacement efficiency.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a tire size updating method, device, vehicle and storage medium. Background Art

[0002] At present, users have higher and higher demands on vehicles. For users, vehicles are not only a means of transportation, but also can be used for off-road entertainment. In off-road scenarios, there may be a need to replace tires. However, after replacing the tires, if the tire size is different from the original tire size, the vehicle speed will be incorrectly obtained.

[0003] In the related art, after replacing a tire, the user needs to manually refresh the tire parameters offline.

[0004] However, the above method needs to be performed manually offline, and the entire process is very labor-intensive and time-consuming, resulting in reduced tire replacement efficiency. Summary of the invention

[0005] The present application provides a tire size update method, device, vehicle and storage medium, which can automatically update the tire size set for the vehicle after the tire is replaced, thereby saving labor costs and time costs and improving tire replacement efficiency. The technical solution includes the following contents.

[0006] In a first aspect, a tire size updating method is provided, the method comprising:

[0007] Obtaining a reference speed of the target vehicle at the i-th moment, the reference speed comprising a first speed obtained based on the acceleration of the target vehicle and / or a second speed obtained based on a positioning component of the target vehicle, wherein i is an integer greater than or equal to 1;

[0008] Determining the credibility of the reference speed corresponding to a target time period based on a third speed of the target vehicle at multiple times and a reference speed, wherein the third speed is a speed calculated based on the wheel speed of the target vehicle, and the target time period includes the multiple times;

[0009] When the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition, the tire size of the target vehicle is updated based on the speed difference between the reference vehicle speed at the multiple moments and the third vehicle speed and the wheel speed of the target vehicle.

[0010] In the present application, the reference speed of the target vehicle at the i-th moment is first obtained, that is, the first speed obtained based on the acceleration of the target vehicle and / or the second speed obtained based on the positioning component of the target vehicle at the i-th moment is first obtained, so that the reference speed of the target vehicle at multiple moments can be obtained. Then, based on the third speed of the target vehicle at multiple moments and the reference speed, the credibility of the reference speed corresponding to the target time period is determined, that is, whether the reference speed obtained at multiple moments fluctuates stably, so as to determine whether the wheel size can be calculated accordingly in the subsequent period. Afterwards, when the credibility of the reference speed corresponding to the target time period meets the credibility condition, it means that the reference speed at multiple moments is stable. In this case, the tire size of the target vehicle can be updated based on the speed difference between the reference speed at multiple moments and the third speed and the wheel speed of the target vehicle. In this way, after the vehicle changes the tire, the tire size set for the vehicle can be automatically updated, thereby saving labor costs and time costs and improving tire replacement efficiency.

[0011] Optionally, determining the credibility of the reference speed corresponding to the target time period based on the third speed of the target vehicle at multiple times and the reference speed includes:

[0012] In the case where the reference vehicle speed includes the first vehicle speed, determining the difference between the first vehicle speed at the i-th moment and the third vehicle speed to obtain the first difference at the i-th moment; determining a first variance of the first differences at the multiple moments; and determining the credibility of the first vehicle speed corresponding to the target time period based on the first variance;

[0013] And / or, when the reference vehicle speed includes the second vehicle speed, determine the difference between the second vehicle speed at the i-th moment and the third vehicle speed to obtain the second difference at the i-th moment; determine the second variance of the second differences at the multiple moments; and based on the second variance, determine the credibility of the second vehicle speed corresponding to the target time period.

[0014] Optionally, when the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition, before updating the tire size of the target vehicle based on the vehicle speed difference between the reference vehicle speed at the multiple moments and the third vehicle speed and the wheel speed of the target vehicle, the method further includes:

[0015] When the credibility of the first vehicle speed is greater than a preset credibility threshold or the credibility of the second vehicle speed is greater than the preset credibility threshold, it is determined that the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition; or, when the credibility of the first vehicle speed and the credibility of the second vehicle speed are both greater than the preset credibility threshold, it is determined that the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition;

[0016] When the credibility of the first vehicle speed is less than or equal to the preset credibility threshold and / or the credibility of the second vehicle speed is less than or equal to the preset credibility threshold, it is determined that the credibility of the reference vehicle speed corresponding to the target time period does not meet the credibility condition.

[0017] Optionally, updating the tire size of the target vehicle based on the vehicle speed difference between the reference vehicle speed at the multiple moments and the third vehicle speed and the wheel speed of the target vehicle comprises:

[0018] Determine the tire radius difference based on the vehicle speed difference between the reference vehicle speed and the third vehicle speed at the plurality of moments and the wheel speed of the target vehicle, wherein the tire radius difference refers to the difference between the tire radius before the tire is replaced and the tire radius after the tire is replaced;

[0019] The tire radius difference is added to the original tire radius of the target vehicle to update a new tire radius.

[0020] Optionally, the determining the tire radius difference based on the vehicle speed difference between the reference vehicle speed and the third vehicle speed at the multiple moments and the wheel speed of the target vehicle comprises:

[0021] Determine a first difference average value between the first differences at the multiple moments; or determine a second difference average value between the second differences at the multiple moments, the first difference being the vehicle speed difference between the first vehicle speed and the third vehicle speed, and the second difference being the vehicle speed difference between the second vehicle speed and the third vehicle speed; divide the first difference average value or the second difference average value by the wheel speed of the target vehicle to obtain the tire radius difference;

[0022] Alternatively, determine a third difference average value between the first difference values ​​at the multiple moments and the second difference values ​​at the multiple moments; divide the third difference average value by the wheel speed of the target vehicle to obtain the tire radius difference.

[0023] Optionally, after updating the tire size of the target vehicle based on the vehicle speed difference between the reference vehicle speed at the multiple moments and the third vehicle speed and the wheel speed of the target vehicle, the method further includes:

[0024] Obtaining the first vehicle speed and / or the second vehicle speed of the target vehicle at the i-th moment;

[0025] Determine the difference between the first vehicle speed and the third vehicle speed at the i-th moment to obtain a third difference at the i-th moment; and / or determine the difference between the second vehicle speed and the third vehicle speed at the i-th moment to obtain a fourth difference at the i-th moment;

[0026] When the third differences at multiple moments are all smaller than a preset difference threshold, determine the variance of the third differences at multiple moments to obtain a third variance; and / or, when the fourth differences at multiple moments are all smaller than the preset difference threshold, determine the variance of the fourth differences at multiple moments to obtain a fourth variance;

[0027] In a case where the third variance is smaller than the second variance threshold and / or the fourth variance is smaller than the second variance threshold, it is determined that the tire size update of the target vehicle is completed.

[0028] Optionally, before obtaining the reference speed of the target vehicle at the i-th moment, the method further includes:

[0029] In response to a tire size update instruction for the target vehicle, obtaining a current vehicle speed and a plurality of accelerations of the target vehicle;

[0030] determining a rate of change of acceleration of the target vehicle based on the plurality of accelerations;

[0031] Optionally, obtaining a reference speed of the target vehicle at the i-th moment includes:

[0032] When the current speed of the target vehicle is greater than the target speed threshold, the multiple accelerations are all greater than the preset acceleration threshold, and the acceleration change rate is less than the preset change rate threshold, the reference speed of the target vehicle at the i-th moment is obtained.

[0033] In a second aspect, a tire size updating device is provided, the device comprising:

[0034] A first acquisition module is used to acquire a reference speed of the target vehicle at the i-th moment, wherein the reference speed includes a first speed obtained based on the acceleration of the target vehicle and / or a second speed obtained based on the positioning component of the target vehicle, and i is an integer greater than or equal to 1;

[0035] A first determination module is used to determine the credibility of the reference speed corresponding to the target time period based on the third speed of the target vehicle at multiple moments and the reference speed, the third speed being the speed calculated based on the wheel speed of the target vehicle, and the target time period includes the multiple moments;

[0036] An updating module is used to update the tire size of the target vehicle based on the speed difference between the reference vehicle speed at the multiple moments and the third vehicle speed and the wheel speed of the target vehicle when the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition.

[0037] Optionally, the first determining module is used to:

[0038] In the case where the reference vehicle speed includes the first vehicle speed, determining the difference between the first vehicle speed at the i-th moment and the third vehicle speed to obtain the first difference at the i-th moment; determining a first variance of the first differences at the multiple moments; and determining the credibility of the first vehicle speed corresponding to the target time period based on the first variance;

[0039] And / or, when the reference vehicle speed includes the second vehicle speed, determine the difference between the second vehicle speed at the i-th moment and the third vehicle speed to obtain the second difference at the i-th moment; determine the second variance of the second differences at the multiple moments; and based on the second variance, determine the credibility of the second vehicle speed corresponding to the target time period.

[0040] Optionally, the device further comprises:

[0041] a second determination module, configured to determine that the credibility of the reference speed corresponding to the target time period meets the credibility condition when the credibility of the first speed is greater than a preset credibility threshold or the credibility of the second speed is greater than the preset credibility threshold; or, when the credibility of the first speed and the credibility of the second speed are both greater than the preset credibility threshold, determine that the credibility of the reference speed corresponding to the target time period meets the credibility condition;

[0042] The third determination module is used to determine that the credibility of the reference vehicle speed corresponding to the target time period does not meet the credibility condition when the credibility of the first vehicle speed is less than or equal to the preset credibility threshold and / or the credibility of the second vehicle speed is less than or equal to the preset credibility threshold.

[0043] Optionally, the update module is used to:

[0044] Determine the tire radius difference based on the vehicle speed difference between the reference vehicle speed and the third vehicle speed at the plurality of moments and the wheel speed of the target vehicle, wherein the tire radius difference refers to the difference between the tire radius before the tire is replaced and the tire radius after the tire is replaced;

[0045] The tire radius difference is added to the original tire radius of the target vehicle to update a new tire radius.

[0046] Optionally, the update module is used to:

[0047] Determine a first difference average value between the first differences at the multiple moments; or determine a second difference average value between the second differences at the multiple moments, the first difference being the vehicle speed difference between the first vehicle speed and the third vehicle speed, and the second difference being the vehicle speed difference between the second vehicle speed and the third vehicle speed; divide the first difference average value or the second difference average value by the wheel speed of the target vehicle to obtain the tire radius difference;

[0048] Alternatively, determine a third difference average value between the first difference values ​​at the multiple moments and the second difference values ​​at the multiple moments; divide the third difference average value by the wheel speed of the target vehicle to obtain the tire radius difference.

[0049] Optionally, the device further comprises:

[0050] A second acquisition module, used for acquiring the first vehicle speed and / or the second vehicle speed of the target vehicle at the i-th moment;

[0051] a fourth determination module, configured to determine the difference between the first vehicle speed and the third vehicle speed at the i-th moment to obtain a third difference at the i-th moment; and / or determine the difference between the second vehicle speed and the third vehicle speed at the i-th moment to obtain a fourth difference at the i-th moment;

[0052] A fifth determination module is used to determine the variance of the third difference values ​​at multiple moments when the third difference values ​​at multiple moments are all less than a preset difference threshold value to obtain a third variance; and / or, when the fourth difference values ​​at multiple moments are all less than the preset difference threshold value, determine the variance of the fourth difference values ​​at multiple moments to obtain a fourth variance;

[0053] The sixth determination module is used to determine that the tire size update of the target vehicle is completed when the third variance is smaller than the second variance threshold and / or the fourth variance is smaller than the second variance threshold.

[0054] Optionally, the device further comprises:

[0055] A third acquisition module, configured to acquire a current vehicle speed and a plurality of accelerations of the target vehicle in response to a tire size update instruction for the target vehicle;

[0056] a seventh determination module, configured to determine a rate of change of acceleration of the target vehicle based on the plurality of accelerations;

[0057] Optionally, the first acquisition module is used to:

[0058] When the current speed of the target vehicle is greater than the target speed threshold, the multiple accelerations are all greater than the preset acceleration threshold, and the acceleration change rate is less than the preset change rate threshold, the reference speed of the target vehicle at the i-th moment is obtained.

[0059] In a third aspect, a vehicle is provided, the vehicle comprising:

[0060] A memory for storing executable program codes;

[0061] The processor is used to call and run the executable program code from the memory, so that the vehicle executes the above tire size updating method.

[0062] In a fourth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the above-mentioned tire size updating method is implemented.

[0063] In a fifth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the computer to execute the steps of the above tire size updating method.

[0064] It can be understood that the beneficial effects of the second, third, fourth and fifth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0066] Figure 1 is a flow chart of a tire size updating method provided in an embodiment of the present application;

[0067] Figure 2 is a flow chart of another tire size updating method provided by an embodiment of the present application;

[0068] Figure 3 is a structural schematic diagram of a tire size updating device provided in an embodiment of the present application;

[0069] Figure 4 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0070] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0071] It should be understood that the "multiple" mentioned in this application refers to two or more. In the description of this application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in order to facilitate the clear description of the technical solution of this application, the words "first" and "second" are used to distinguish between the same items or similar items with basically the same functions and effects. Those skilled in the art can understand that the words "first" and "second" do not limit the quantity and execution order, and the words "first" and "second" do not limit them to be different.

[0072] Before describing the tire size updating method provided in the embodiment of the present application, the application scenario of the embodiment of the present application is described first.

[0073] After the vehicle's tires are replaced, the different tire sizes will cause the speed displayed when the vehicle is driving to be different. In this case, after the vehicle's tires are replaced, the new tire size needs to be manually refreshed offline, otherwise the vehicle's speed will deviate, which is not conducive to safe driving.

[0074] To this end, an embodiment of the present application provides a tire size updating method, which can automatically update the tire size after the vehicle replaces the tire, thereby improving the tire size updating efficiency, thereby ensuring that the vehicle can obtain an accurate vehicle speed while driving, and ensuring driving safety.

[0075] The tire size updating method provided in the embodiment of the present application can be applied to the scenario of replacing tires of a vehicle.

[0076] Specifically, after the tires of the vehicle are replaced, the first vehicle speed obtained based on the acceleration of the target vehicle and / or the second vehicle speed obtained based on the positioning component of the vehicle can be obtained at multiple times. Then, based on the third vehicle speed of the vehicle at multiple times and the first vehicle speed and / or the second vehicle speed, determine whether the first vehicle speed and / or the second vehicle speed are in a stable fluctuation state for a period of time. If they are in a stable fluctuation state, it means that the first vehicle speed and / or the second vehicle speed are close to the actual vehicle speed of the vehicle, and the wheel size can be calculated accordingly. Therefore, when the first vehicle speed and / or the second vehicle speed are in a stable fluctuation state for a period of time, the tire size of the vehicle is updated based on the speed difference between the third vehicle speed at multiple times and the first vehicle speed and / or the second vehicle speed, and the wheel speed of the vehicle.

[0077] In this way, after the vehicle replaces the tire, the tire size can be automatically updated, thereby improving the efficiency of tire size updating, thereby ensuring that the vehicle can obtain an accurate speed while driving, and ensuring driving safety.

[0078] The tire size updating method provided in the embodiment of the present application is explained in detail below.

[0079] Figure 1 is a flow chart of a tire size update method provided by an embodiment of the present application. The method can be applied to the ECU (Electronic Control Unit) of a vehicle. Figure 1 , the method comprises the following steps.

[0080] Step 101: Obtain a reference speed of a target vehicle at the i-th moment, where the reference speed includes a first speed obtained based on an acceleration of the target vehicle and / or a second speed obtained based on a positioning component of the target vehicle.

[0081] i is an integer greater than or equal to 1.

[0082] The positioning component can obtain the positioning of the target vehicle, so that the second speed of the target vehicle can be obtained through the position change of the target vehicle over time. In the embodiment of the present application, the positioning component can be a system with satellite navigation function such as GPS (Global Positioning System) and Beidou Satellite Navigation System, and the embodiment of the present application does not make a sole limitation on this.

[0083] Since the vehicle speed calculated based on the acceleration and the vehicle speed obtained based on the positioning component do not depend on the tire radius of the vehicle, the vehicle speed obtained in the above manner is relatively accurate.

[0084] In this case, by obtaining the reference speed of the target vehicle at the i-th moment, a more accurate speed can be obtained, which is then used as a reference to calculate a more accurate tire radius.

[0085] It is worth noting that before obtaining the reference speed of the target vehicle at the i-th moment, it is also necessary to first determine the reference speed of the target vehicle at the i-th moment.

[0086] Specifically, the operation of determining the first speed of the target vehicle at the i-th moment may be: obtaining the initial speed and initial acceleration of the target vehicle; integrating over a preset time period based on the initial acceleration to obtain the integrated speed at the first moment (when i is equal to 1); adding the integrated speed at the first moment to the initial speed to obtain the first speed of the target vehicle at the first moment; for the first speed of the target vehicle at the i-th moment, integrating over a preset time period based on the acceleration of the target vehicle at the i-1th moment to obtain the integrated speed at the i-th moment, adding the first speed at the i-1th moment to the integrated speed at the i-th moment to obtain the first speed of the target vehicle at the i-th moment.

[0087] The initial vehicle speed and initial acceleration are the speed and acceleration of the target vehicle when it is determined that the tire size update method is to be executed. That is, when it is determined that the tire size update is to be performed, the vehicle speed and acceleration of the target vehicle at this moment are first obtained to calculate the first vehicle speed of the target vehicle at the i-th moment.

[0088] Optionally, an acceleration sensor may be installed on the target vehicle. In the embodiment of the present application, the initial acceleration of the target vehicle may be acquired through the acceleration sensor.

[0089] The preset time period is the time period between the i-1th moment and the ith moment, that is, the time interval between two adjacent moments. Optionally, the preset time period can be pre-set by a technician.

[0090] In the embodiment of the present application, by performing the above operations at multiple times, the first vehicle speed of the target vehicle at multiple times can be obtained.

[0091] The following example illustrates the entire process of determining the first vehicle speed of the target vehicle at multiple moments. For example, in the embodiment of the present application, the first vehicle speed of the target vehicle at five moments is to be determined.

[0092] (1) When it is determined that the tire size needs to be updated, the initial speed and initial acceleration of the target vehicle are obtained.

[0093] (2) Integrate the initial acceleration over a preset time period to obtain the integrated vehicle speed at the first moment, where the upper limit of the integration is the moment when the initial speed of the target vehicle is obtained, and the lower limit of the integration is the first moment among the multiple moments. Then, add the initial speed of the target vehicle to the integrated vehicle speed of the target vehicle at the first moment to obtain the first vehicle speed of the target vehicle at the first moment.

[0094] (3) Obtain the acceleration of the target vehicle at the first moment, and integrate the acceleration at the first moment over a preset time period to obtain the integrated vehicle speed at the second moment. The upper limit of the integral is the first moment, and the lower limit of the integral is the second moment. Then, add the first vehicle speed of the target vehicle at the first moment to the integrated vehicle speed at the second moment to obtain the first vehicle speed of the target vehicle at the second moment.

[0095] (4) Obtain the acceleration of the target vehicle at the second moment, and integrate the acceleration at the second moment over a preset time period to obtain the integrated vehicle speed at the third moment. The upper limit of the integration is the second moment, and the lower limit of the integration is the third moment. Then, add the first vehicle speed of the target vehicle at the second moment to the integrated vehicle speed at the third moment to obtain the first vehicle speed of the target vehicle at the third moment.

[0096] (5) Obtain the acceleration of the target vehicle at the third moment, and integrate the acceleration at the third moment over a preset time period to obtain the integrated vehicle speed at the fourth moment. The upper limit of the integration is the third moment, and the lower limit of the integration is the fourth moment. Then, add the first vehicle speed of the target vehicle at the third moment to the integrated vehicle speed at the fourth moment to obtain the first vehicle speed of the target vehicle at the fourth moment.

[0097] (6) Obtain the acceleration of the target vehicle at the fourth moment, and integrate the acceleration at the fourth moment over a preset time period to obtain the integrated vehicle speed at the fifth moment. The upper limit of the integral is the fourth moment, and the lower limit of the integral is the fifth moment. Then, add the first vehicle speed of the target vehicle at the fourth moment to the integrated vehicle speed at the fifth moment to obtain the first vehicle speed of the target vehicle at the fifth moment.

[0098] It is worth noting that before obtaining the reference speed of the target vehicle at the i-th moment, it is also possible to determine whether the current driving state of the target vehicle meets the preset conditions.

[0099] The preset conditions are conditions under which the tire size can be updated.

[0100] It is worth noting that in the embodiment of the present application, before determining the reference vehicle speed at each moment, it is necessary to first determine whether the current driving state of the target vehicle meets the preset conditions. That is, before determining the reference vehicle speed at a moment, it is necessary to first determine whether the current driving state of the target vehicle meets the preset conditions. Only when the current driving state of the target vehicle meets the preset conditions, the reference vehicle speed at this moment is determined.

[0101] Then, before obtaining the reference speed of the target vehicle at the i-th moment, the following steps (1) to (2) may also be included.

[0102] (1) In response to a tire size update instruction for a target vehicle, a current vehicle speed and a plurality of accelerations of the target vehicle are acquired.

[0103] The tire size update instruction for the target vehicle is used to instruct to update the tire size of the target vehicle. The tire size update instruction can be triggered by the user. For example, the user can trigger the tire update instruction by clicking, sliding, somatosensory, voice, etc. As an example, the vehicle is provided with an entry for updating the tire size, such as a button for updating the tire size on the multimedia central control screen. After changing the tire of the vehicle, the user can click the button on the multimedia central control screen to trigger the tire size update instruction.

[0104] The tire size update instruction provides a triggering method for updating the tire size of the target vehicle. In the embodiment of the present application, it is also possible to independently determine whether to update the tire size of the target vehicle.

[0105] Specifically, the second speed and the third speed of the target vehicle at multiple moments are obtained; when the difference between the second speed and the third speed at a preset number of moments among the multiple moments is greater than a preset speed threshold, it is determined that the tire size of the target vehicle needs to be updated.

[0106] The third vehicle speed is the vehicle speed calculated based on the wheel speed of the target vehicle, specifically based on The calculated vehicle speed. Where V is the third vehicle speed, is the wheel speed of the target vehicle, and r is the radius of the target vehicle. It should be understood that when calculating the third vehicle speed at this time, r is the tire radius before updating.

[0107] The preset number and the preset vehicle speed threshold can be set in advance, and the preset number and the preset vehicle speed threshold can both be set larger.

[0108] Since the second speed is a relatively accurate speed obtained based on the positioning component of the target vehicle, and the third speed is a speed calculated based on the wheel speed of the target vehicle, which will be affected by the tire radius, by obtaining the second speed and the third speed at multiple moments, it can be determined whether the speed calculated based on the wheel speed of the target vehicle is accurate, that is, whether the speed calculated by the target vehicle itself is accurate.

[0109] In this case, if the difference between the second speed and the third speed at a preset number of moments among the multiple moments is greater than the preset speed threshold, it means that the difference between the second speed and the third speed at a preset number of moments among the multiple moments is large, that is, there are more moments with a large difference between the second speed and the third speed among the multiple moments, which also means that there are more moments with inaccurate speed calculated by the self among the multiple moments, so it can be determined that the speed calculated by the target vehicle itself is inaccurate. When it is determined that the speed calculated by the target vehicle itself is inaccurate, it can be determined that the tire size of the target vehicle needs to be updated later.

[0110] In this way, by judging whether the speed calculated by the target vehicle itself is accurate, it is possible to automatically determine whether the tire size needs to be updated, thereby improving the efficiency of tire size updating, making the entire process more intelligent, and improving user experience.

[0111] In the embodiment of the present application, the current speed of the target vehicle is a speed determined based on the wheel speed, and the multiple accelerations can be obtained by an acceleration sensor installed on the target vehicle.

[0112] (2) Based on the plurality of accelerations, determine the acceleration change rate of the target vehicle.

[0113] The acceleration change rate is used to indicate the change of the acceleration of the target vehicle. In the embodiment of the present application, whether the acceleration of the target vehicle is stable can be known based on the acceleration change rate.

[0114] Since the acceleration of the vehicle will change, the acceleration collected by the acceleration sensor cannot be used for long-term integration. In addition, if there is a problem with the acceleration obtained by the acceleration sensor, then the first vehicle speed obtained by integration will also have errors. Therefore, in the embodiment of the present application, by determining the acceleration change rate, it is known whether there is a problem with the accuracy of the acceleration sensor within a period of time, that is, to determine whether there is a problem with the acceleration obtained by the acceleration sensor.

[0115] In this case, the operation of step 101 may be: when the current speed of the target vehicle is greater than the target speed threshold, the multiple accelerations are all greater than the preset acceleration threshold and the acceleration change rate is less than the preset change rate threshold, obtain the reference speed of the target vehicle at multiple times.

[0116] The target vehicle speed threshold, the preset acceleration threshold and the preset change rate threshold can be set in advance by a technician, and the target vehicle speed threshold and the preset acceleration threshold can be set larger, and the preset change rate threshold can be set smaller.

[0117] Generally, the smaller the speed of a vehicle is, the more unstable its acceleration fluctuation is. In the case of unstable acceleration, the speed obtained by integration will have a large error. Therefore, in the embodiment of the present application, the current speed of the target vehicle can be determined.

[0118] In this case, when the current speed of the target vehicle is greater than the target speed threshold, it means that the current speed of the target vehicle is relatively high. Then, the acceleration fluctuation of the vehicle is relatively stable at this time, and a relatively accurate speed can be obtained by subsequently integrating the acceleration of the target vehicle.

[0119] In addition, when the multiple accelerations are all greater than the preset acceleration threshold and the acceleration change rate is less than the preset change rate threshold, it means that the multiple accelerations are large and the acceleration change rate is small, which means that the current acceleration fluctuation of the target vehicle is relatively stable, then the acceleration obtained by the acceleration sensor of the target vehicle is relatively accurate, so that the subsequent integration of the acceleration can obtain a more accurate vehicle speed.

[0120] Based on the above conditions, that is, when the current speed of the target vehicle is greater than the target speed threshold, the multiple accelerations are greater than the preset acceleration threshold, and the acceleration change rate is less than the preset change rate threshold, it means that the acceleration fluctuation of the target vehicle is relatively stable at this time, and then the subsequent integration of the acceleration can obtain a more accurate vehicle speed. This also means that the tire size of the target vehicle can be updated, and it can be determined that the current driving state of the target vehicle meets the preset conditions, and the reference speed of the target vehicle at multiple times can be obtained.

[0121] Optionally, when the current speed of the target vehicle is less than or equal to the target speed threshold, or there is an acceleration among the multiple accelerations that is less than a preset acceleration threshold, or the acceleration change rate is greater than or equal to a preset change rate threshold, the reference speed at the i-th moment is not determined.

[0122] When the current speed of the target vehicle is less than or equal to the target speed threshold, it means that the current speed of the target vehicle is low, and the acceleration fluctuation of the vehicle may be unstable. When there is an acceleration less than the preset acceleration threshold among multiple accelerations, it means that there is a small acceleration among the multiple accelerations. And when the acceleration change rate is greater than or equal to the preset change rate threshold, it means that the acceleration change rate is large, and the current acceleration fluctuation of the target vehicle is large. Then the acceleration obtained by the acceleration sensor of the target vehicle may not be accurate enough, and then a more accurate speed may not be determined later. Therefore, the reference speed at the i-th moment is not determined at this time.

[0123] Furthermore, the current speed, acceleration and acceleration change rate of the target vehicle can be continuously monitored, and when the current speed of the target vehicle is greater than the target speed threshold, multiple accelerations are greater than the preset acceleration threshold and the acceleration change rate is less than the preset change rate threshold, the reference speed of the target vehicle at the i-th moment is obtained.

[0124] Step 102: Determine the credibility of the reference speed corresponding to the target time period based on the third speed of the target vehicle at multiple times and the reference speed, where the third speed is a speed calculated based on the wheel speed of the target vehicle.

[0125] The target time period includes the multiple moments, that is, the target time period is a time period composed of the multiple moments.

[0126] The credibility of the reference speed corresponding to the target time period is used to indicate whether the first speed of the target vehicle fluctuates stably during a period of time, and / or whether the second speed of the target vehicle fluctuates stably during a period of time, that is, whether the first speed of the target vehicle fluctuates stably at multiple times, and / or whether the second speed of the target vehicle fluctuates stably at multiple times. It can further indicate the credibility of the acceleration collected by the acceleration sensor and / or the credibility of the position obtained by the positioning component.

[0127] Generally, when a vehicle is driving normally, the speed is in a stable and fluctuating state. For example, when the user increases the speed, the speed of the vehicle will gradually increase and will not suddenly jump to a certain speed. At this time, the speed is also in a stable and fluctuating state. For another example, when the user is driving at a stable speed, the speed fluctuation range is small. At this time, the speed is also in a stable and fluctuating state.

[0128] In this case, by determining the credibility of the reference vehicle speed corresponding to the target time period, it is possible to determine whether the reference vehicle speed within the target time period fluctuates stably, and then determine whether the reference vehicle speeds at these multiple moments are true, that is, whether the reference vehicle speeds at these multiple moments can be used subsequently.

[0129] Optionally, the operation of step 102 may be implemented in the following three possible situations.

[0130] In the first case, when the reference vehicle speed includes the first vehicle speed, the difference between the first vehicle speed at the i-th moment and the third vehicle speed is determined to obtain the first difference at the i-th moment; the first variance of the first differences at the multiple moments is determined; based on the first variance, the credibility of the first vehicle speed corresponding to the target time period is determined.

[0131] Variance is a measure used to measure the degree of discreteness of a set of data. In the embodiment of the present application, the credibility of the first speed corresponding to the target time period can indicate whether the first speed of the target vehicle fluctuates stably at multiple times, that is, whether there is a sudden jump in the first speed at the multiple times. Therefore, the credibility of the first speed corresponding to the target time period can be accurately determined by the variance.

[0132] In addition, when the reference vehicle speed includes the first vehicle speed, it means that the reference vehicle speed is the speed obtained based on the acceleration of the target vehicle, which means determining the credibility of the speed obtained from the acceleration of the target vehicle within the target time period. Subsequently, it can be determined whether the speed obtained from the acceleration of the target vehicle within the target time period is stable, and then whether the acceleration collected by the acceleration sensor of the target vehicle is accurate. Only in this way can it be determined whether the first vehicle speed within the target time period is true.

[0133] In this case, by calculating the variance of the first differences at multiple moments, it is possible to know whether the first differences at multiple moments are close, that is, whether the first vehicle speed obtained based on the acceleration of the target vehicle is stable. In this way, the credibility of the first vehicle speed corresponding to the target time period is subsequently determined by the variance, which can more accurately indicate whether the first vehicle speed at multiple moments is stable.

[0134] Optionally, in the embodiment of the present application, for the first difference at any one of the first differences at the multiple moments, after the first difference at a moment is determined, the first difference may be stored. That is, each time a first difference is determined, the determined first difference is stored.

[0135] Optionally, in an embodiment of the present application, the multiple first differences can be stored in a memory of the target vehicle. Of course, they can also be stored in a cloud server, which is not limited in the embodiment of the present application. For example, the first differences at multiple moments can be stored on a blockchain to ensure that the stored first differences at multiple moments will not be tampered with, so that a more accurate credibility can be determined later, and the real first differences at multiple moments can be used to determine the tire size, thereby obtaining a more accurate tire size.

[0136] Optionally, based on the first variance, the operation of determining the credibility of the first vehicle speed corresponding to the target time period may be: acquiring the credibility corresponding to the first variance from a corresponding relationship between the variance and the credibility.

[0137] The correspondence between variance and credibility includes multiple variances and multiple credibility, and the multiple variances and the multiple credibility correspond one to one, that is, for any one of the multiple variances, there is one credibility in the correspondence between variance and credibility.

[0138] In the embodiment of the present application, multiple variances and multiple credibility can be set in inverse proportion, that is, the smaller the variance, the larger the credibility can be set; the larger the variance, the smaller the credibility can be set.

[0139] In this case, the credibility can be determined more quickly by directly acquiring the credibility corresponding to the first variance from the corresponding relationship between the variance and the credibility.

[0140] In the second case, when the reference vehicle speed includes the second vehicle speed, the difference between the second vehicle speed at the i-th moment and the third vehicle speed is determined to obtain the second difference at the i-th moment; the second variance of the second differences at the multiple moments is determined; based on the second variance, the credibility of the second vehicle speed corresponding to the target time period is determined.

[0141] In the embodiment of the present application, the credibility of the second vehicle speed corresponding to the target time period can indicate whether the second vehicle speed of the target vehicle fluctuates stably at multiple times, that is, whether there is a sudden jump in the second vehicle speed at the multiple times. Therefore, the credibility of the second vehicle speed corresponding to the target time period can be accurately indicated by the variance.

[0142] In addition, when the reference vehicle speed includes the second vehicle speed, it means that the reference vehicle speed is based on the second vehicle speed obtained by the positioning component, which means that the credibility of the second vehicle speed obtained by the positioning component within the target time period is determined, so that it can be subsequently known whether the second vehicle speed obtained by the positioning component within the target time period is stable, and then it can be known whether the position obtained by the positioning component of the target vehicle is accurate, so that it can be known whether the second vehicle speed within the target time period is real.

[0143] In this case, by calculating the variance of the second difference values ​​at the multiple moments, it is possible to know whether the second difference values ​​at the multiple moments are close, that is, whether the second vehicle speed obtained based on the positioning component of the target vehicle is stable. In this way, the credibility of the second vehicle speed corresponding to the target time period is subsequently represented by the variance, which can more accurately measure whether the second vehicle speed at the multiple moments is stable.

[0144] Optionally, in the embodiment of the present application, for the second difference at any one moment among the second differences at the multiple moments, after determining the second difference at one moment, the second difference may be stored. That is, each time a second difference is determined, the determined second difference is stored.

[0145] Optionally, in an embodiment of the present application, the multiple second differences can be stored in a memory of the target vehicle. Of course, they can also be stored in a cloud server, which is not limited in the embodiment of the present application. For example, the second differences at multiple moments can be stored on a blockchain to ensure that the stored second differences at multiple moments will not be tampered with, so that a more accurate credibility can be determined later, and the real second differences at multiple moments can be used to determine the tire size, thereby obtaining a more accurate tire size.

[0146] Optionally, based on the second variance, the operation of determining the credibility of the second vehicle speed corresponding to the target time period may be: acquiring the credibility corresponding to the second variance from a corresponding relationship between the variance and the credibility.

[0147] In a third case, when the reference vehicle speed includes a first vehicle speed and a second vehicle speed, the difference between the first vehicle speed and the third vehicle speed at the ith moment is determined to obtain the first difference at the ith moment, and the difference between the second vehicle speed and the third vehicle speed at the ith moment is determined to obtain the second difference at the ith moment; a first variance of the first differences at the multiple moments is determined, and a second variance of the second differences at the multiple moments is determined; based on the first variance, the credibility of the first vehicle speed corresponding to the target time period is determined, and based on the second variance, the credibility of the second vehicle speed corresponding to the target time period is determined.

[0148] When the reference speed includes the first speed and the second speed, it means that the first speed based on the acceleration of the target vehicle and the second speed based on the positioning component of the target vehicle can be obtained, and then the tire size of the target vehicle can be calculated by combining the first speed and the second speed. In this case, it is necessary to ensure that the first speed and the second speed at the multiple moments fluctuate stably before they can be used. Then determining the credibility of the reference speed corresponding to the target time period is actually determining the credibility of the first speed corresponding to the target time period and the credibility of the second speed corresponding to the target time period.

[0149] In this case, by determining the credibility of the first vehicle speed corresponding to the target time period and the credibility of the second vehicle speed corresponding to the target time period, the first vehicle speed corresponding to the target time period and the second vehicle speed corresponding to the target time period can be combined to jointly determine the tire size of the target vehicle, thereby determining the accurate tire size.

[0150] Further, after determining the credibility of the reference vehicle speed corresponding to the target time period, it may also be determined whether the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition.

[0151] The credibility condition is used to indicate whether the reference vehicle speeds at the multiple moments are stable.

[0152] Specifically, the operation of determining whether the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition can be implemented in the following three possible situations.

[0153] First, when the reference vehicle speed includes the first vehicle speed, if the credibility of the first vehicle speed is greater than a preset credibility threshold, it is determined that the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition. If the credibility of the first vehicle speed is less than or equal to the preset credibility threshold, it is determined that the credibility of the reference vehicle speed corresponding to the target time period does not meet the credibility condition.

[0154] The preset credibility threshold may be set in advance by a technician, and the preset credibility threshold may be set relatively large.

[0155] When the reference vehicle speed includes the first vehicle speed, it is equivalent to determining whether the credibility of the first vehicle speed corresponding to the target time period meets the credibility condition. Then the credibility of the first vehicle speed can be compared with a preset credibility threshold.

[0156] Then, when the credibility of the first vehicle speed is greater than the preset credibility threshold, it means that the credibility of the first vehicle speed is large, which means that the first variance is small, and thus the first difference values ​​at multiple moments are close, which means that the first vehicle speed of the target vehicle at multiple moments fluctuates stably. Then it means that there is no problem with the acceleration obtained by the vehicle speed sensor, and the first vehicle speed at multiple moments obtained by integration is fine and can be used later. Then it can be determined that the credibility of the first vehicle speed corresponding to the target time period meets the credibility condition, that is, the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition.

[0157] When the credibility of the first vehicle speed is less than or equal to the preset credibility threshold, it means that the credibility of the first vehicle speed is small, which means that the first variance is large, and thus the first difference values ​​at multiple moments are not close enough, which means that the first vehicle speed of the target vehicle at multiple moments is unstable. This means that there may be a problem with the acceleration obtained by the vehicle speed sensor, which may lead to a problem with the first vehicle speed at multiple moments obtained by integration. In this case, the first vehicle speed at multiple moments cannot be used later, and it can be determined that the credibility of the reference vehicle speed corresponding to the target time period does not meet the credibility condition.

[0158] Second, in the case where the reference vehicle speed includes the second vehicle speed, if the credibility of the second vehicle speed is greater than a preset credibility threshold, it is determined that the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition. If the credibility of the second vehicle speed is less than or equal to the preset credibility threshold, it is determined that the credibility of the reference vehicle speed corresponding to the target time period does not meet the credibility condition.

[0159] When the credibility of the second vehicle speed is greater than the preset credibility threshold, it means that the credibility of the second vehicle speed is large, which means that the second variance is small, and thus the second difference values ​​at multiple moments are close, which means that the second vehicle speed of the target vehicle at multiple moments fluctuates stably. This means that the second vehicle speed obtained by the positioning component is accurate and can be used later. It can be determined that the credibility of the second vehicle speed corresponding to the target time period meets the credibility condition, that is, the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition.

[0160] When the credibility of the second vehicle speed is less than or equal to the preset credibility threshold, it means that the credibility of the second vehicle speed is small, which means that the second variance is large, and thus the second difference values ​​at multiple moments are not close enough, which means that the second vehicle speed of the target vehicle at multiple moments is unstable. This means that there is a problem with the positioning obtained by the positioning component, which leads to a problem with the second vehicle speed obtained by the positioning component. In this case, the second vehicle speed at multiple moments cannot be used later, and it can be determined that the credibility of the reference vehicle speed corresponding to the target time period does not meet the credibility condition.

[0161] Third, in the case where the reference vehicle speed includes the first vehicle speed and the second vehicle speed, if the credibility of the first vehicle speed and the credibility of the second vehicle speed are both greater than the preset credibility threshold, it is determined that the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition; if the credibility of the first vehicle speed is less than or equal to the preset credibility threshold and the credibility of the second vehicle speed is less than or equal to the preset credibility threshold, it is determined that the credibility of the reference vehicle speed corresponding to the target time period does not meet the credibility condition.

[0162] Since the first vehicle speed and the second vehicle speed are to be used together to determine the tire size of the target vehicle later, it is necessary to ensure that the first vehicle speed and the second vehicle speed at the multiple moments are both true and accurate. In this case, it can be determined whether the credibility of the first vehicle speed and the credibility of the second vehicle speed are both greater than the preset credibility threshold.

[0163] When the credibility of the first vehicle speed is greater than the preset credibility threshold, and the credibility of the second vehicle speed is greater than the preset credibility threshold, it means that the first vehicle speed at the multiple moments and the second vehicle speed at the multiple moments are stable. Then the first vehicle speed at the multiple moments and the second vehicle speed at the multiple moments can be used in the subsequent calculation of the tire size, so as to determine that the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition.

[0164] When the credibility of the first vehicle speed is less than or equal to the preset credibility threshold, or the credibility of the second vehicle speed is less than or equal to the preset credibility threshold, it means that the first vehicle speed is unstable or the second vehicle speed is unstable, and the unstable vehicle speed cannot be used subsequently. It can be determined that the credibility of the reference vehicle speed corresponding to the target time period does not meet the credibility condition.

[0165] Step 103: When the credibility of the reference speed corresponding to the target time period meets the credibility condition, the tire size of the target vehicle is updated based on the speed difference between the reference speed at the multiple moments and the third speed and the wheel speed of the target vehicle.

[0166] The tire size of the target vehicle may include a tire radius of the target vehicle.

[0167] In an embodiment of the present application, a wheel speed sensor may be installed on the wheel of the target vehicle, and the wheel speed of the target vehicle may be acquired through the wheel speed sensor.

[0168] When the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition, it means that the reference vehicle speeds at the multiple moments are relatively accurate and can be used when calculating the tire size. In this way, a relatively accurate tire size can be obtained through the relatively accurate vehicle speed difference between the reference vehicle speeds at the multiple moments and the third vehicle speed and the wheel speed of the target vehicle.

[0169] Optionally, the operation of step 103 may be: determining the tire radius difference based on the vehicle speed difference between the reference vehicle speed at the multiple moments and the third vehicle speed and the wheel speed of the target vehicle; adding the tire radius difference to the original tire radius of the target vehicle to update a new tire radius.

[0170] The tire radius difference refers to the difference between the tire radius before the tire is replaced and the tire radius after the tire is replaced.

[0171] In the embodiment of the present application, since the vehicle speed difference between the reference vehicle speed at the multiple moments and the third vehicle speed is obtained, the tire radius difference can be calculated subsequently to calculate the new tire radius.

[0172] Wherein, based on the vehicle speed difference between the reference vehicle speed at the multiple moments and the third vehicle speed and the wheel speed of the target vehicle, the operation of determining the tire radius difference may be implemented in the following two possible ways.

[0173] A first possible implementation method is to determine, when the reference vehicle speed includes the first vehicle speed or the second vehicle speed, a first difference average value between first differences at multiple moments; or, to determine a second difference average value between second differences at multiple moments; and to divide the first difference average value or the second difference average value by the wheel speed of the target vehicle to obtain the tire radius difference.

[0174] The first difference is a vehicle speed difference between the first vehicle speed and the third vehicle speed, and the second difference is a vehicle speed difference between the second vehicle speed and the third vehicle speed.

[0175] Since there are multiple first differences or second differences, if the tire radius is calculated directly using multiple first differences or multiple second differences, multiple tire radii will be calculated. Therefore, in the embodiment of the present application, the average value of the first difference between the first differences at multiple moments, or the average value of the second difference between the second differences at multiple moments can be determined first. Subsequently, a tire radius is directly calculated using the average value of the first difference or the average value of the second difference.

[0176] In this way, the error of tire radius can be reduced by first determining the average value of multiple first differences or multiple second differences, rather than directly calculating multiple tire radii through multiple first differences or multiple second differences and then calculating the average value of multiple tire radii.

[0177] For example, the second vehicle speed (V 21 、V 22 、V 23 ), the third vehicle speed at 3 moments (V 31 、V 32 、V 33 Then the speed difference between the second speed and the third speed (multiple second differences) can be calculated as (V 21 -V 31 、V 22 -V 32 、V 23 -V 33 ). The second difference average value between the multiple second differences is calculated as Then divide the second difference average by the wheel speed of the target vehicle The tire radius difference is .

[0178] A second possible implementation method is to determine a third difference average value between the first difference at multiple moments and the second difference at multiple moments when the reference vehicle speed includes the first vehicle speed and the second vehicle speed; and divide the third difference average value by the wheel speed of the target vehicle to obtain the tire radius difference.

[0179] In this case, when the reference vehicle speed includes the first vehicle speed and the second vehicle speed, the tire radius difference is calculated by combining the differences between the plurality of first vehicle speeds and the plurality of second vehicle speeds and the third vehicle speed, thereby obtaining a more accurate tire radius difference.

[0180] The first possible implementation manner and the second possible implementation manner are equivalent to calculating the tire radius difference through the following formula (1).

[0181] (1)

[0182] in, It is the first difference average value, the second difference average value, or the third difference average value. is the wheel speed of the target vehicle, is the tire radius difference.

[0183] Optionally, after the new tire radius is updated, it may also be determined whether the new tire radius is accurate.

[0184] Specifically, after updating the tire size of the target vehicle, the first speed and / or the second speed of the target vehicle at the i-th moment is obtained; the difference between the first speed and the third speed at the i-th moment is determined to obtain the third difference at the i-th moment; and / or, the difference between the second speed and the third speed at the i-th moment is determined to obtain the fourth difference at the i-th moment; when the third differences at multiple moments are all less than a preset difference threshold, the variance of the third differences at multiple moments is determined to obtain a third variance; and / or, when the fourth differences at multiple moments are all less than a preset difference threshold, the variance of the fourth differences at multiple moments is determined to obtain a fourth variance; when the third variance is less than the second variance threshold and / or the fourth variance is less than the second variance threshold, it is determined that the update of the tire size of the target vehicle is completed.

[0185] The above-mentioned multiple times are multiple times after the tire size is updated.

[0186] The second variance threshold may be set in advance, and may be set in a relationship that the second variance threshold is less than or equal to the first variance threshold.

[0187] In this case, it is equivalent to re-acquiring the first vehicle speed and / or the second vehicle speed and the third vehicle speed after updating the tire size, and judging whether the difference between the first vehicle speed and the third vehicle speed calculated based on the acceleration and the difference between the second vehicle speed and the third vehicle speed obtained based on the positioning component meet certain conditions. When certain conditions are met, it can be determined that the tire size update of the target vehicle is relatively accurate. When the conditions are not met, it means that the tire size update of the target vehicle is not accurate enough. Then, the tire size needs to be updated subsequently. Specifically, steps 101 to 103 can be re-executed to re-update the tire size.

[0188] Specifically, first, when the first vehicle speed is obtained, it is determined whether the third difference at multiple moments is less than the preset difference threshold. When the third difference at multiple moments is less than the preset difference threshold, it means that the difference between the first vehicle speed and the third vehicle speed at multiple moments is small. This means that the first vehicle speed is close to the third vehicle speed, which means that the vehicle speed calculated based on the wheel speed of the target vehicle is close to the vehicle speed determined based on the acceleration, and then it is further determined whether the first vehicle speed is credible.

[0189] Specifically, when the third variance is less than the second variance threshold, it means that the third differences are close to each other, thus indicating that the first vehicle speeds are relatively stable. Therefore, it can be determined that the acceleration obtained by the acceleration sensor of the target vehicle is relatively accurate, and the first vehicle speed obtained subsequently is also relatively accurate, so it can be determined that the first vehicle speed is credible.

[0190] In summary, on the basis that the first vehicle speed is credible, that is, the first vehicle speed is relatively accurate, if the first vehicle speed is relatively close to the third vehicle speed, then it can be determined that the vehicle speed calculated based on the wheel speed of the target vehicle is relatively accurate, that is, it can be determined that there is no problem with the tire radius of the target vehicle, and it is determined that the tire size update of the target vehicle is completed.

[0191] Second, when the second vehicle speed is obtained, it is determined whether the fourth difference at multiple moments is less than the preset difference threshold. When the fourth difference at multiple moments is less than the preset difference threshold, it means that the difference between the second vehicle speed and the third vehicle speed at multiple moments is small. This means that the second vehicle speed is close to the third vehicle speed, which means that the vehicle speed calculated based on the wheel speed of the target vehicle is close to the vehicle speed obtained by the positioning component, and then it is further determined whether the second vehicle speed is credible.

[0192] Specifically, when the fourth variance is less than the second variance threshold, it means that the fourth differences are close to each other, thus indicating that the second vehicle speeds are relatively stable. Therefore, it can be determined that the position obtained by the positioning component is relatively accurate, and the second vehicle speed obtained subsequently is also relatively accurate, so it can be determined that the second vehicle speed is credible.

[0193] In summary, on the basis that the second vehicle speed is credible, that is, the second vehicle speed is relatively accurate, if the second vehicle speed is relatively close to the third vehicle speed, then it can be determined that the vehicle speed calculated based on the wheel speed of the target vehicle is relatively accurate, that is, it can be determined that there is no problem with the tire radius of the target vehicle, and then it is determined that the tire size update of the target vehicle is completed.

[0194] Third, when the first vehicle speed and the second vehicle speed are obtained, it is comprehensively judged whether the third difference and the fourth difference at multiple moments are all less than the preset difference threshold. When the third difference at multiple moments and the fourth difference at multiple moments are all less than the preset difference threshold, it indicates that the vehicle speed calculated based on the wheel speed of the target vehicle is relatively close to the vehicle speed obtained by the positioning component and the vehicle speed determined based on the acceleration. Further, when the third variance and the fourth variance are both less than the second variance threshold, it indicates that the multiple third differences are relatively close to each other and the multiple fourth differences are relatively close to each other, thereby indicating that the multiple first vehicle speeds and the multiple second vehicle speeds are relatively stable. Therefore, it can be determined that the first vehicle speed and the second vehicle speed are both credible.

[0195] In summary, on the basis that the first vehicle speed and the second vehicle speed are both credible, if the first vehicle speed is relatively close to the third vehicle speed, and the second vehicle speed is relatively close to the third vehicle speed, then it can be determined that the vehicle speed calculated based on the wheel speed of the target vehicle is relatively accurate, that is, it can be determined that there is no problem with the tire radius of the target vehicle, and it is determined that the tire size update of the target vehicle is completed.

[0196] After the tire size of the target vehicle is updated through the above steps 101 to 103, the speed of the target vehicle can also be determined based on the new tire size to correct the speed of the target vehicle, so that the target vehicle can display a more accurate speed, and the user can see a more accurate speed.

[0197] For ease of understanding, now combined Figure 2 The tire size updating method provided in the embodiment of the present application is illustrated by taking an example. For example, Figure 2 is a flowchart of another tire size updating method provided in an embodiment of the present application, see Figure 2 , the tire size updating method includes the following steps.

[0198] Step 201: In response to a tire size update instruction for a target vehicle, determining whether a current driving state of the target vehicle meets a preset condition.

[0199] Step 202: When the current driving state of the target vehicle meets a preset condition, obtain reference vehicle speeds of the target vehicle at multiple times, including the first vehicle speed and / or the second vehicle speed at multiple times.

[0200] Step 203: Determine the difference between the first vehicle speed and the third vehicle speed at the i-th moment to obtain the first difference at the i-th moment, and / or determine the difference between the second vehicle speed and the third vehicle speed at the i-th moment to obtain the second difference at the i-th moment.

[0201] Step 204: Determine a first variance of the plurality of first differences; and / or determine a second variance of the plurality of second differences, and determine the credibility of the reference vehicle speed corresponding to the target time period based on the first variance and / or the second variance.

[0202] Step 205: Determine whether the credibility of the reference vehicle speed corresponding to the target time period is greater than a credibility threshold.

[0203] Step 206: When the credibility of the first vehicle speed corresponding to the target time period is greater than the first variance threshold and / or the credibility of the second vehicle speed corresponding to the target time period is greater than the credibility threshold, it is determined that the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition. When the credibility of the first vehicle speed corresponding to the target time period is less than or equal to the credibility threshold and / or the credibility of the second vehicle speed corresponding to the target time period is less than or equal to the credibility threshold, it is determined that the credibility of the reference vehicle speed corresponding to the target time period does not meet the credibility condition.

[0204] Step 207: When the credibility of the reference speed corresponding to the target time period meets the credibility condition, the tire size of the target vehicle is updated based on the speed difference between the reference speed at the multiple moments and the third speed and the wheel speed of the target vehicle.

[0205] Step 208: Determine whether the tire size of the target vehicle is updated accurately.

[0206] Step 209: If the tire size of the target vehicle is updated accurately, determine that the tire size update of the target vehicle is completed; if the tire size of the target vehicle is updated inaccurately, return to step 201 to re-execute the method for updating the tire size.

[0207] In the embodiment of the present application, the ECU first obtains the reference speed of the target vehicle at the i-th moment, that is, first obtains the first speed obtained based on the acceleration of the target vehicle at the i-th moment and / or the second speed obtained based on the positioning component of the target vehicle, thereby obtaining the reference speed of the target vehicle at multiple moments. Then, based on the third speed of the target vehicle at multiple moments and the reference speed, the credibility of the reference speed corresponding to the target time period is determined, that is, whether the reference speed obtained at multiple moments fluctuates stably, so as to determine whether the wheel size can be calculated based on this in the future. Afterwards, if the credibility of the reference speed corresponding to the target time period meets the credibility condition, it means that the reference speed at multiple moments can be used in the future. In this case, the tire size of the target vehicle is updated based on the speed difference between the reference speed at multiple moments and the third speed and the wheel speed of the target vehicle. In this way, after the vehicle changes the tire, the tire size set for the vehicle can be automatically updated, thereby saving labor costs and time costs and improving tire replacement efficiency.

[0208] Figure 3 is a schematic diagram of a tire size update device provided in an embodiment of the present application. The tire size update device can be implemented by software, hardware, or a combination of both to become part or all of a vehicle, and the vehicle can be as follows Figure 4 Vehicle shown. See Figure 3The device includes: a first acquisition module 301, a first determination module 302 and an update module 303.

[0209] A first acquisition module 301 is used to acquire a reference speed of the target vehicle at the i-th moment, where the reference speed includes a first speed obtained based on the acceleration of the target vehicle and / or a second speed obtained based on the positioning component of the target vehicle, and i is an integer greater than or equal to 1;

[0210] A first determination module 302 is used to determine the credibility of the reference speed corresponding to the target time period based on the third speed of the target vehicle at multiple moments and the reference speed, the third speed being the speed calculated based on the wheel speed of the target vehicle, and the target time period includes the multiple moments;

[0211] The updating module 303 is used to update the tire size of the target vehicle based on the speed difference between the reference speed at multiple moments and the third speed and the wheel speed of the target vehicle when the credibility of the reference speed corresponding to the target time period meets the credibility condition.

[0212] Optionally, the first determining module 302 is used to:

[0213] In the case where the reference vehicle speed includes the first vehicle speed, determining the difference between the first vehicle speed and the third vehicle speed at the i-th moment to obtain the first difference at the i-th moment; determining the first variance of the first differences at the multiple moments; and determining the credibility of the first vehicle speed corresponding to the target time period based on the first variance;

[0214] And / or, when the reference vehicle speed includes the second vehicle speed, determine the difference between the second vehicle speed at the i-th moment and the third vehicle speed to obtain the second difference at the i-th moment; determine the second variance of the second differences at the multiple moments; and based on the second variance, determine the credibility of the second vehicle speed corresponding to the target time period.

[0215] Optionally, the device further comprises:

[0216] a second determination module, for determining that the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition when the credibility of the first vehicle speed is greater than a preset credibility threshold or the credibility of the second vehicle speed is greater than the preset credibility threshold; or, for determining that the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition when both the credibility of the first vehicle speed and the credibility of the second vehicle speed are greater than the preset credibility threshold;

[0217] The third determination module is used to determine that the credibility of the reference vehicle speed corresponding to the target time period does not meet the credibility condition when the credibility of the first vehicle speed is less than or equal to a preset credibility threshold and / or the credibility of the second vehicle speed is less than or equal to the preset credibility threshold.

[0218] Optionally, the updating module 303 is used to:

[0219] Determine a tire radius difference based on the vehicle speed difference between the reference vehicle speed at the plurality of moments and the third vehicle speed and the wheel speed of the target vehicle, wherein the tire radius difference refers to a difference between a tire radius before the tire is replaced and a tire radius after the tire is replaced;

[0220] The tire radius difference is added to the original tire radius of the target vehicle to update the new tire radius.

[0221] Optionally, the updating module 303 is used to:

[0222] Determine a first difference average value between first differences at multiple moments; or determine a second difference average value between second differences at multiple moments, the first difference being a vehicle speed difference between a first vehicle speed and a third vehicle speed, and the second difference being a vehicle speed difference between a second vehicle speed and a third vehicle speed; divide the first difference average value or the second difference average value by the wheel speed of the target vehicle to obtain a tire radius difference;

[0223] Alternatively, a third difference average value between the first difference values ​​at multiple moments and the second difference values ​​at multiple moments is determined; and the third difference average value is divided by the wheel speed of the target vehicle to obtain the tire radius difference.

[0224] Optionally, the device further comprises:

[0225] A second acquisition module is used to acquire the first speed and / or the second speed of the target vehicle at the i-th moment;

[0226] a fourth determination module, configured to determine the difference between the first vehicle speed and the third vehicle speed at the i-th moment to obtain a third difference at the i-th moment; and / or determine the difference between the second vehicle speed and the third vehicle speed at the i-th moment to obtain a fourth difference at the i-th moment;

[0227] a fifth determination module, configured to determine the variance of the plurality of third differences to obtain a third variance when the third differences at the plurality of moments and / or the fourth differences at the plurality of moments are less than a preset difference threshold; and / or, when the fourth differences at the plurality of moments are all less than the preset difference threshold, determine the variance of the plurality of fourth differences to obtain a fourth variance;

[0228] The sixth determination module is used to determine that the tire size update of the target vehicle is completed when the third variance is smaller than the second variance threshold and / or the fourth variance is smaller than the second variance threshold.

[0229] Optionally, the device further comprises:

[0230] A third acquisition module, configured to acquire a current vehicle speed and a plurality of accelerations of the target vehicle in response to a tire size update instruction for the target vehicle;

[0231] a seventh determination module, configured to determine a rate of change of acceleration of the target vehicle based on the plurality of accelerations;

[0232] Optionally, the first acquisition module 301 is used to:

[0233] When the current speed of the target vehicle is greater than the target speed threshold, the multiple accelerations are all greater than the preset acceleration threshold, and the acceleration change rate is less than the preset change rate threshold, the reference speed of the target vehicle at the i-th moment is obtained.

[0234] In the embodiment of the present application, the reference speed of the target vehicle at the i-th moment is first obtained, that is, the first speed obtained based on the acceleration of the target vehicle and / or the second speed obtained based on the positioning component of the target vehicle at the i-th moment is first obtained, so that the reference speed of the target vehicle at multiple moments can be obtained. Then, based on the third speed of the target vehicle at multiple moments and the reference speed, the credibility of the reference speed corresponding to the target time period is determined, that is, whether the reference speed obtained at multiple moments fluctuates stably, so as to determine whether the wheel size can be calculated based on it in the future. Afterwards, if the credibility of the reference speed corresponding to the target time period meets the credibility condition, it means that the reference speed at multiple moments can be used in the future. In this case, the tire size of the target vehicle is updated based on the speed difference between the reference speed at multiple moments and the third speed and the wheel speed of the target vehicle. In this way, after the vehicle changes the tire, the tire size set for the vehicle can be automatically updated, thereby saving labor costs and time costs and improving tire replacement efficiency.

[0235] It should be noted that: the tire size updating device provided in the above embodiment only uses the division of the above functional modules as an example when updating the tire size. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0236] The functional units and modules in the above embodiments may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit, and the above integrated units may be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the protection scope of the embodiments of the present application.

[0237] The tire size updating device and the tire size updating method provided in the above embodiments belong to the same concept. The specific working process and technical effects brought about by the units and modules in the above embodiments can be found in the method embodiment part and will not be repeated here.

[0238] Figure 4 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application.

[0239] For example, Figure 4 As shown, the vehicle 400 includes: a memory 41 and a processor 40, wherein the memory 41 stores an executable program code 42, and the processor 40 is used to call and execute the executable program code 42 to perform the above tire size updating method.

[0240] In this embodiment, the functional modules of the vehicle can be divided according to the above method example. For example, each functional module can be corresponded, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware. It should be noted that the division of modules in this embodiment is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0241] In the case of dividing each functional module according to each function, the vehicle may include: a first acquisition module, a first determination module and an update module. It should be noted that all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module, which will not be repeated here.

[0242] The vehicle provided in this embodiment is used to execute the above-mentioned tire size updating method, and thus can achieve the same effect as the above-mentioned implementation method.

[0243] In the case of an integrated unit, the vehicle may include a processing module and a storage module. The processing module may be used to control and manage the actions of the vehicle. The storage module may be used to support the vehicle in executing mutual program codes and data.

[0244] The processing module may be a processor or a controller, which may implement or execute various exemplary logic blocks, modules and circuits shown in combination with the contents disclosed in this application. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc. The storage module may be a memory.

[0245] This embodiment also provides a computer-readable storage medium, in which a computer program code is stored. When the computer program code is executed on a computer, the computer executes the above-mentioned related method steps to implement the above-mentioned tire size updating method in the above-mentioned embodiment.

[0246] This embodiment further provides a computer program product. When the computer program product is run on a computer, the computer is caused to execute the above-mentioned related steps to implement the above-mentioned method for updating the tire size in the above-mentioned embodiment.

[0247] Among them, the vehicle, computer-readable storage medium, computer program product or chip provided in this embodiment are all used to execute the method provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the method provided above and will not be repeated here.

[0248] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and brevity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0249] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0250] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A tire size updating method, characterized in that: The method comprises: Obtaining a reference speed of the target vehicle at the i-th moment, the reference speed comprising a first speed obtained based on the acceleration of the target vehicle and / or a second speed obtained based on a positioning component of the target vehicle, wherein i is an integer greater than or equal to 1; Determining the credibility of the reference speed corresponding to a target time period based on a third speed of the target vehicle at multiple times and a reference speed, wherein the third speed is a speed calculated based on the wheel speed of the target vehicle, and the target time period includes the multiple times; When the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition, updating the tire size of the target vehicle based on the vehicle speed difference between the reference vehicle speed and the third vehicle speed at the multiple moments and the wheel speed of the target vehicle; The determining the credibility of the reference speed corresponding to the target time period based on the third speed of the target vehicle at multiple times and the reference speed includes: In the case where the reference vehicle speed includes the first vehicle speed, determining the difference between the first vehicle speed at the i-th moment and the third vehicle speed to obtain the first difference at the i-th moment; determining a first variance of the first differences at the multiple moments; and determining the credibility of the first vehicle speed corresponding to the target time period based on the first variance; and / or, when the reference vehicle speed includes the second vehicle speed, determining the difference between the second vehicle speed at the i-th moment and the third vehicle speed to obtain the second difference at the i-th moment; determining a second variance of the second differences at the plurality of moments; and determining the credibility of the second vehicle speed corresponding to the target time period based on the second variance; The updating of the tire size of the target vehicle based on the vehicle speed difference between the reference vehicle speed at the plurality of moments and the third vehicle speed and the wheel speed of the target vehicle comprises: Determine a tire radius difference based on the vehicle speed difference between the reference vehicle speed and the third vehicle speed at the plurality of moments and the wheel speed of the target vehicle, wherein the tire radius difference refers to a difference between a tire radius before the tire is replaced and a tire radius after the tire is replaced; The tire radius difference is added to the original tire radius of the target vehicle to update a new tire radius.

2. The method according to claim 1, characterized in that When the credibility of the reference speed corresponding to the target time period meets the credibility condition, before updating the tire size of the target vehicle based on the speed difference between the reference speed at the multiple moments and the third speed and the wheel speed of the target vehicle, the method further includes: When the credibility of the first vehicle speed is greater than a preset credibility threshold or the credibility of the second vehicle speed is greater than the preset credibility threshold, it is determined that the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition; or, when the credibility of the first vehicle speed and the credibility of the second vehicle speed are both greater than the preset credibility threshold, it is determined that the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition; When the credibility of the first vehicle speed is less than or equal to the preset credibility threshold and / or the credibility of the second vehicle speed is less than or equal to the preset credibility threshold, it is determined that the credibility of the reference vehicle speed corresponding to the target time period does not meet the credibility condition.

3. The method according to claim 1, characterized in that The determining the tire radius difference based on the vehicle speed difference between the reference vehicle speed and the third vehicle speed at the plurality of moments and the wheel speed of the target vehicle comprises: Determine a first difference average value between the first differences at the multiple moments; or determine a second difference average value between the second differences at the multiple moments, the first difference being the vehicle speed difference between the first vehicle speed and the third vehicle speed, and the second difference being the vehicle speed difference between the second vehicle speed and the third vehicle speed; divide the first difference average value or the second difference average value by the wheel speed of the target vehicle to obtain the tire radius difference; Alternatively, determine a third difference average value between the first difference values ​​at the multiple moments and the second difference values ​​at the multiple moments; divide the third difference average value by the wheel speed of the target vehicle to obtain the tire radius difference.

4. The method according to claim 1, characterized in that After updating the tire size of the target vehicle based on the vehicle speed difference between the reference vehicle speed at the plurality of moments and the third vehicle speed and the wheel speed of the target vehicle, the method further includes: Obtaining the first vehicle speed and / or the second vehicle speed of the target vehicle at the i-th moment; Determine the difference between the first vehicle speed and the third vehicle speed at the i-th moment to obtain a third difference at the i-th moment; and / or determine the difference between the second vehicle speed and the third vehicle speed at the i-th moment to obtain a fourth difference at the i-th moment; When the third differences at multiple moments are all smaller than a preset difference threshold, determine the variance of the third differences at multiple moments to obtain a third variance; and / or, when the fourth differences at multiple moments are all smaller than the preset difference threshold, determine the variance of the fourth differences at multiple moments to obtain a fourth variance; In a case where the third variance is smaller than the second variance threshold and / or the fourth variance is smaller than the second variance threshold, it is determined that the tire size update of the target vehicle is completed.

5. The method according to claim 1, characterized in that Before obtaining the reference speed of the target vehicle at the i-th moment, the method further includes: In response to a tire size update instruction for the target vehicle, obtaining a current vehicle speed and a plurality of accelerations of the target vehicle; determining a rate of change of acceleration of the target vehicle based on the plurality of accelerations; The obtaining of the reference speed of the target vehicle at the i-th moment includes: When the current speed of the target vehicle is greater than the target speed threshold, the multiple accelerations are all greater than the preset acceleration threshold, and the acceleration change rate is less than the preset change rate threshold, the reference speed of the target vehicle at the i-th moment is obtained.

6. A tire size updating device, characterized in that: The device comprises: A first acquisition module is used to acquire a reference speed of the target vehicle at the i-th moment, wherein the reference speed includes a first speed obtained based on the acceleration of the target vehicle and / or a second speed obtained based on the positioning component of the target vehicle, and i is an integer greater than or equal to 1; A first determination module is used to determine the credibility of the reference speed corresponding to the target time period based on the third speed of the target vehicle at multiple moments and the reference speed, the third speed being the speed calculated based on the wheel speed of the target vehicle, and the target time period includes the multiple moments; an updating module, configured to update the tire size of the target vehicle based on the vehicle speed difference between the reference vehicle speed and the third vehicle speed at the plurality of moments and the wheel speed of the target vehicle, if the credibility of the reference vehicle speed corresponding to the target time period meets the credibility condition; The first determining module is used for: In the case where the reference vehicle speed includes the first vehicle speed, determining the difference between the first vehicle speed at the i-th moment and the third vehicle speed to obtain the first difference at the i-th moment; determining a first variance of the first differences at the multiple moments; and determining the credibility of the first vehicle speed corresponding to the target time period based on the first variance; and / or, when the reference vehicle speed includes the second vehicle speed, determining the difference between the second vehicle speed at the i-th moment and the third vehicle speed to obtain the second difference at the i-th moment; determining a second variance of the second differences at the plurality of moments; and determining the credibility of the second vehicle speed corresponding to the target time period based on the second variance; The update module is used to: Determine a tire radius difference based on the vehicle speed difference between the reference vehicle speed and the third vehicle speed at the plurality of moments and the wheel speed of the target vehicle, wherein the tire radius difference refers to a difference between a tire radius before the tire is replaced and a tire radius after the tire is replaced; The tire radius difference is added to the original tire radius of the target vehicle to update a new tire radius.

7. A vehicle, characterized in that: The vehicle comprises: A memory for storing executable program codes; A processor, configured to call and run the executable program code from the memory so that the vehicle executes the method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

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