阅读说明：本技术 一种车辆、胎压监测系统、轮胎位置识别模块及方法 (Vehicle, tire pressure monitoring system, tire position identification module and method ) 是由 王涛 王玉涛 刘晔 于 2019-10-15 设计创作，主要内容包括：本发明公开了一种车辆、胎压监测系统、轮胎位置识别模块及方法,其中,轮胎位置识别模块包括磁场产生单元、磁性传感器以及处理单元,处理单元与磁性传感器连接；磁场产生单元设置于轮胎护泥板上；对应不同的轮胎位置,磁场产生单元中包括不同数量的磁体；磁性传感器设置于轮胎上,用于采集磁场产生单元的磁场强度信息；轮胎与轮胎护泥板对应设置；处理单元设置于轮胎上且与磁性传感器连接,用于根据磁场强度信息识别轮胎的位置,方法算法简单、系统结构简易,可快速精准地定位轮胎的安装位置。(The invention discloses a vehicle, a tire pressure monitoring system, a tire position identification module and a method, wherein the tire position identification module comprises a magnetic field generation unit, a magnetic sensor and a processing unit, and the processing unit is connected with the magnetic sensor; the magnetic field generating unit is arranged on the tire mud guard; the magnetic field generating unit comprises different numbers of magnets corresponding to different tire positions; the magnetic sensor is arranged on the tire and used for collecting the magnetic field intensity information of the magnetic field generating unit; the tire and the tire mud guard are correspondingly arranged; the processing unit is arranged on the tire, connected with the magnetic sensor and used for identifying the position of the tire according to the magnetic field intensity information, the method is simple in algorithm and simple in system structure, and the mounting position of the tire can be quickly and accurately positioned.)

1. The tire position identification module is characterized by comprising a magnetic field generation unit, a magnetic sensor and a processing unit, wherein the processing unit is connected with the magnetic sensor;

the magnetic field generating unit is arranged on the tire mud guard; the magnetic field generating unit comprises different numbers of magnets corresponding to different tire positions;

the magnetic sensor is arranged on the tire and used for collecting the magnetic field intensity information of the magnetic field generating unit; the tire and the tire mud guard plate are arranged correspondingly;

the processing unit is arranged on the tire, connected with the magnetic sensor and used for identifying the position of the tire according to the magnetic field intensity information.

2. The tire position identifying module according to claim 1, wherein when the magnetic field generating unit includes one of the magnets, the magnet is disposed directly above the tire mud guard; when the magnetic field generating unit comprises at least two magnets, the at least two magnets are uniformly arranged along the circumferential direction of the tire mud guard.

3. The tire position identification module of claim 1, wherein the magnet is a bar permanent magnet.

4. A tire position identifying method applied to the tire position identifying module according to any one of claims 1 to 3, comprising:

acquiring magnetic field intensity information acquired by the magnetic sensor in at least one rotation period; the rotation period is the time of one rotation of the tire;

determining the occurrence times of the characteristic points according to the magnetic field intensity information;

and inquiring the corresponding relation between the preset feature point occurrence frequency and the tire position according to the feature point occurrence frequency, and identifying the tire position.

5. The tire position identifying method according to claim 4, wherein said step of determining the number of occurrences of the feature point based on the magnetic field strength information includes:

drawing a magnetic field intensity curve graph according to the magnetic field intensity information;

determining the occurrence times of magnetic field intensity peak values according to the magnetic field intensity curve graph, wherein the magnetic field intensity peak values are magnetic field intensity wave peaks or magnetic field intensity wave troughs;

and inquiring the corresponding relation between the preset magnetic field intensity peak value occurrence frequency and the tire position according to the magnetic field intensity peak value occurrence frequency, and identifying the tire position.

6. The tire position identifying method according to claim 4, wherein said at least one rotation cycle includes N rotation cycles, N ≧ 1, and N is an integer;

the step of inquiring the corresponding relation between the preset feature point occurrence frequency and the tire position according to the feature point occurrence frequency and identifying the tire position comprises the following steps:

calculating a first average value of the feature point occurrence times in each rotation period according to the feature point occurrence times in the first M rotation periods in the N rotation periods; m < N, and M is a positive integer;

inquiring the corresponding relation between the occurrence frequency of the preset feature points and the tire positions according to the first average value, and identifying the first tire position;

calculating a second average value of the feature point occurrence times in each rotation period according to the feature point occurrence times in the last (N-M) rotation periods of the N rotation periods;

inquiring the corresponding relation between the occurrence frequency of the preset feature points and the tire positions according to the second average value, and identifying the second tire position;

determining that the tire first position is the tire position when the tire second position is the same as the tire first position.

7. A tire position identification method as claimed in claim 4, wherein said obtaining of magnetic field strength information collected by said magnetic sensor during at least one rotation cycle further comprises:

acquiring the centripetal acceleration of each tire;

determining the rotation period of each tire according to the centripetal acceleration of each tire.

8. The tire position identifying method according to claim 7, further comprising, before said obtaining a centripetal acceleration of each of said tires:

acquiring the current state of the vehicle, wherein the current state of the vehicle comprises the current running speed of the vehicle and the time interval between the current starting time of the vehicle and the last stopping time of the vehicle;

and when the current running speed is greater than the preset running speed and the time interval is greater than the preset time interval, controlling the tire position identification module to be started.

9. A tire pressure monitoring system, comprising: the tire location identification module of any one of claims 1 to 3, further comprising a tire pressure sensor disposed on the tire and electrically connected to the processing unit for collecting a tire pressure value of the tire;

and the communication module is electrically connected with the processing unit and used for sending the position of the tire and the tire pressure value of the tire to the display module, and the display module is used for displaying the position of the tire and the tire pressure value of the tire.

10. A vehicle comprising the tire pressure monitoring system of claim 9.

Technical Field

The embodiment of the invention relates to the technical field of automotive electronics, in particular to a vehicle, a tire pressure monitoring system, a tire position identification module and a tire position identification method.

Background

As the automobile industry develops and popularizes, all vehicles of national mandatory legislation must be provided with a tire pressure sensor for safe driving of automobiles, but the tire pressure sensor is not known to be mounted on which tire of which vehicle when being shipped from the factory, but is calibrated by a calibration device on a production line of a vehicle factory. After a user purchases a vehicle, if the position of the tire is changed, if the front wheel and the rear wheel are exchanged, or the tire pressure sensor is changed, the tire pressure sensor needs to be calibrated again in a 4S shop, which wastes time and labor.

In order to solve the above problems, two methods for automatically identifying a tire pressure sensor are proposed in the prior art, one of which is a dual-axis + RSSI algorithm, in which the judgment of front and rear wheels is based on the field intensity of wireless electromagnetic waves, but the positioning accuracy is low and the method is not adopted gradually because the wireless electromagnetic waves are interfered by many factors (receiver position, passengers in a vehicle, vehicle refitting conditions, goods in the vehicle, etc.). Secondly, a mixed signal algorithm is used for identifying the front wheel and the rear wheel based on software of statistics, but the algorithm is complex, the identification time is long, the power consumption is large when the automatic identification function is started by the sensor, and the whole service life is influenced. In addition, additional signals of the vehicle, such as an anti-lock system, an electric power assisting system and the like, need to be combined for identification, and the later maintenance and replacement are complicated.

Disclosure of Invention

The invention provides a tire position identification module, a tire position identification method, a tire pressure monitoring system and a vehicle.

In order to achieve the above object, an embodiment of a first aspect of the present invention provides a tire position identification module, including a magnetic field generating unit, a magnetic sensor, and a processing unit, where the processing unit is connected to the magnetic sensor; the magnetic field generating unit is arranged on the tire mud guard; the magnetic field generating unit comprises different numbers of magnets corresponding to different tire positions; the magnetic sensor is arranged on the tire and used for collecting the magnetic field intensity information of the magnetic field generating unit; the tire and the tire mud guard plate are arranged correspondingly; the processing unit is arranged on the tire, connected with the magnetic sensor and used for identifying the position of the tire according to the magnetic field intensity information.

Optionally, when the magnetic field generating unit comprises a magnet, the magnet is arranged right above the tire mud guard; when the magnetic field generating unit comprises at least two magnets, the at least two magnets are uniformly arranged along the circumferential direction of the tire mud guard.

Optionally, the magnet is a bar permanent magnet.

In order to achieve the above object, a second aspect of the present invention provides a tire position identification method applied to the tire position identification module, including: acquiring magnetic field intensity information acquired by the magnetic sensor in at least one rotation period; the rotation period is the time of one rotation of the tire; determining the occurrence times of the characteristic points according to the magnetic field intensity information; and inquiring the corresponding relation between the preset feature point occurrence frequency and the tire position according to the feature point occurrence frequency, and identifying the tire position.

Optionally, the step of determining the number of occurrences of the feature point according to the magnetic field strength information includes: drawing a magnetic field intensity curve graph according to the magnetic field intensity information; determining the occurrence times of magnetic field intensity peak values according to the magnetic field intensity curve graph, wherein the magnetic field intensity peak values are magnetic field intensity wave peaks or magnetic field intensity wave troughs; and inquiring the corresponding relation between the preset magnetic field intensity peak value occurrence frequency and the tire position according to the magnetic field intensity peak value occurrence frequency, and identifying the tire position.

Optionally, the at least one rotation period includes N rotation periods, N is greater than or equal to 1, and N is an integer; the step of inquiring the corresponding relation between the preset feature point occurrence frequency and the tire position according to the feature point occurrence frequency and identifying the tire position comprises the following steps: calculating a first average value of the feature point occurrence times in each rotation period according to the feature point occurrence times in the first M rotation periods in the N rotation periods; m < N, and M is a positive integer; inquiring the corresponding relation between the occurrence frequency of the preset feature points and the tire positions according to the first average value, and identifying the first tire position; calculating a second average value of the feature point occurrence times in each rotation period according to the feature point occurrence times in the last (N-M) rotation periods of the N rotation periods; inquiring the corresponding relation between the occurrence frequency of the preset feature points and the tire positions according to the second average value, and identifying the second tire position; determining that the tire first position is the tire position when the tire second position is the same as the tire first position.

Optionally, before acquiring the magnetic field strength information acquired by the magnetic sensor in at least one rotation cycle, the method further includes: acquiring the centripetal acceleration of each tire; determining the rotation period of each tire according to the centripetal acceleration of each tire.

Optionally, before acquiring the centripetal acceleration of each tire, the method further comprises:

acquiring the current state of the vehicle, wherein the current state of the vehicle comprises the current running speed of the vehicle and the time interval between the current starting time of the vehicle and the last stopping time of the vehicle; and when the current running speed is greater than the preset running speed and the time interval is greater than the preset time interval, controlling the tire position identification module to be started.

To achieve the above object, a third aspect of the present invention provides a tire-pressure monitoring system, including: the tire position identification module also comprises a tire pressure sensor, wherein the tire pressure sensor is arranged on the tire, is electrically connected with the processing unit and is used for acquiring the tire pressure value of the tire; and the communication module is electrically connected with the processing unit and used for sending the position of the tire and the tire pressure value of the tire to the display module, and the display module is used for displaying the position of the tire and the tire pressure value of the tire.

In order to achieve the above object, a fourth embodiment of the present invention further provides a vehicle including the tire pressure monitoring system described above.

According to the vehicle, the tire pressure monitoring system, the tire position identification module and the tire position identification method, different magnetic field intensity information can be generated corresponding to different tire positions through the magnetic field generation unit arranged on the tire mud guard plate, the magnetic field intensity information is acquired through the magnetic sensor arranged on the tire, the processing unit further inquires the corresponding relation between the preset magnetic field intensity information and the tire position according to the acquired magnetic field intensity information, the tire position is identified, the method algorithm is simple, the system structure is simple, and the installation position of the tire can be quickly and accurately located.

Drawings

FIG. 1 is a block diagram of a tire location identification module according to an embodiment of the present invention;

fig. 2 is a schematic view of an installation structure of a magnetic field generating unit according to an embodiment of the present invention;

fig. 3 is a schematic view of an installation structure of a magnetic field generating unit according to another embodiment of the present invention;

FIG. 4 is a flow chart of a tire location identification method of an embodiment of the present invention;

FIG. 5 is tire magnetic field strength information for one embodiment of the present invention;

FIG. 6 is magnetic field strength information for a tire according to another embodiment of the present invention;

FIG. 7 is magnetic field strength information for a tire in accordance with yet another embodiment of the present invention;

FIG. 8 is tire magnetic field strength information for yet another embodiment of the present invention;

FIG. 9 is a flowchart of a tire location identification method in accordance with one embodiment of the present invention;

fig. 10 is a block diagram of a tire pressure monitoring system of an embodiment of the present invention;

fig. 11 is a block diagram of a vehicle according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

FIG. 1 is a block diagram of a tire location identification module according to an embodiment of the present invention. As shown in fig. 1, the tire position identifying module 100 includes a magnetic field generating unit 101, a magnetic sensor 102, and a processing unit 103, wherein the processing unit 102 is connected to the magnetic sensor 102; the magnetic field generating unit 101 is arranged on the tire mud guard; the magnetic field generating unit 101 includes different numbers of magnets corresponding to different tire positions; the magnetic sensor 102 is arranged on the tire and used for collecting the magnetic field intensity information of the magnetic field generating unit 101; the tire and the tire mud guard are correspondingly arranged; the processing unit 103 is disposed on the tire, connected to the magnetic sensor 102, and configured to identify a position of the tire according to the magnetic field strength information.

It is understood that the identification principle of the tire position identification module 100 is as follows: install the magnet of different quantity on the mud guard of every tire of vehicle, and then the magnetic field intensity information that every tire corresponds is different, and utilize the magnetic sensor 102 of installing on the tire to gather magnetic field intensity information, the position of tire is discerned to the magnetic field intensity information that corresponds according to the different tire positions of presetting in the processing unit 103, the algorithm step is simple, discernment tire position is fast, do not need the extra signal of vehicle, it is accurate to fix a position, after changing the tire, need not to go the 4S shop again and mark the tire position again, user experience is better.

For example, as shown in fig. 2, the vehicle includes four tires, respectively, a left front wheel, a left rear wheel, a right front wheel, and a right rear wheel, and the number of magnets mounted corresponding to the left front wheel, the left rear wheel, the right front wheel, and the right rear wheel is two, three, four, and one, respectively. In the actual operation process, which tire corresponds to several magnets is not specifically limited, and it is only required to ensure that the number of magnets corresponding to four tires is different. Therefore, after the magnets are installed, the corresponding relationship between the number of installed magnets and the tire position can be preset in the processing unit 103 in advance, and further, the processing unit 103 can identify the tire position according to the magnetic sensor 102 collecting the magnetic field strength information generated by the magnetic field generating unit 101. In detail, when the magnetic sensor 102 collects that the magnetic field strength information generated by the magnetic field generating unit 101 is the magnetic field strength information of two magnets, then the processing unit 103 identifies the current tire as a left front wheel; when the magnetic sensor 102 collects that the magnetic field intensity information generated by the magnetic field generating unit 101 is the magnetic field intensity information of one magnet, the processing unit 103 identifies that the current tire is the right front wheel; when the magnetic sensor 102 collects that the magnetic field intensity information generated by the magnetic field generating unit 101 is the magnetic field intensity information of the three magnets, the processing unit 103 identifies that the current tire is a left rear wheel; when the magnetic sensor 102 collects that the magnetic field strength information generated 101 by the magnetic field generating unit is the magnetic field strength information of four magnets, then the processing unit 103 identifies the current tire as the right rear wheel.

Among them, the magnetic sensor 102 is a uniaxial magnetic sensor.

Alternatively, when the magnetic field generating unit 101 includes one magnet, the magnet is disposed right above the tire mud guard; when the magnetic field generating unit 101 includes at least two magnets, the at least two magnets are uniformly arranged in the circumferential direction of the wheel fender.

It can be understood that, as shown in fig. 3, when the number of the magnets arranged on the mud guard corresponding to the tire is three, the magnets are uniformly arranged along the circumferential direction of the mud guard, and preferably, the three magnets are uniformly arranged above the tire, so that the detection result is more accurate.

Optionally, the magnet is a bar permanent magnet.

Fig. 4 is a flowchart of a tire position identifying method according to an embodiment of the present invention. The method may be applied to the tire position recognition module described above, as shown in fig. 4, and includes:

s1, acquiring magnetic field intensity information acquired by the magnetic sensor in at least one rotation period; the rotation period is the time of one rotation of the tire;

that is, the magnetic sensor collects magnetic field strength information in real time when the tire position is identified. And the time of one tire rotation is taken as one acquisition period.

S2, determining the occurrence frequency of the characteristic points according to the magnetic field intensity information;

in the magnetic field strength information acquired in one rotation period (in the acquisition period), if the magnetic field strength value at the current time is greater than the magnetic field strength value at the previous time and greater than the magnetic field strength value at the subsequent time, or if the magnetic field strength value at the current time is less than the magnetic field strength value at the previous time and less than the magnetic field strength value at the subsequent time, the magnetic field strength value at the current time is a characteristic point.

And S3, inquiring the corresponding relation between the preset feature point occurrence frequency and the tire position according to the feature point occurrence frequency, and identifying the tire position.

Specifically, the tire position identification method firstly obtains magnetic field intensity information collected by the magnetic sensor in at least one rotation period, then determines the occurrence frequency of the characteristic points according to the magnetic field intensity information, inquires the corresponding relation between the preset occurrence frequency of the characteristic points and the tire positions according to the occurrence frequency of the characteristic points, identifies the tire positions, has simple algorithm steps, is high in tire position identification speed, does not need additional signals of a vehicle, is accurate in positioning, does not need to go to a 4S shop to recalibrate the tire positions after replacing the tires, and is good in user experience.

For example, taking one acquisition cycle as an example, the vehicle includes four tires, which are respectively a left front wheel, a left rear wheel, a right front wheel, and a right rear wheel, and the number of magnets mounted corresponding to the left front wheel, the left rear wheel, the right front wheel, and the right rear wheel is two, three, four, and one. In the actual operation process, which tire corresponds to several magnets is not specifically limited, and it is only required to ensure that the number of magnets corresponding to four tires is different. Therefore, after the magnet is installed, the corresponding relation between the installation number of the magnet and the tire position can be preset in advance, the corresponding relation between the occurrence frequency of the characteristic points and the tire position is further preset, and the tire position is identified after the occurrence frequency of the characteristic points is acquired according to the magnetic field intensity information acquired by the magnetic sensor.

In detail, when the feature point selects a point at which the magnetic field intensity value at the present time is larger than the magnetic field intensity value at the previous time and is larger than the magnetic field intensity value at the subsequent time, and the number of times the feature point appears is two, then the present tire is identified as the left front wheel; when the number of times of appearance of the feature point is one, identifying the current tire as a right front wheel; when the number of times of appearance of the feature points is three, identifying the current tire as a left rear wheel; when the number of times of appearance of the feature points is four, identifying the current tire as a right rear wheel; when the characteristic point selects a point, the magnetic field intensity value of the current moment is smaller than the magnetic field intensity value of the previous moment and smaller than the magnetic field intensity value of the next moment, and the occurrence frequency of the characteristic point is one time, identifying the current tire as a left front wheel; when the number of times of appearance of the feature points is zero, identifying the current tire as a right front wheel; when the number of times of appearance of the feature points is two, identifying the current tire as a left rear wheel; when the number of occurrences of the feature point is three, then the current tire is identified as the right rear wheel.

Optionally, the step of determining the number of occurrences of the feature point according to the magnetic field strength information includes: drawing a magnetic field intensity curve graph according to the magnetic field intensity information; determining the occurrence frequency of a magnetic field intensity peak value according to a magnetic field intensity curve graph, wherein the magnetic field intensity peak value is a magnetic field intensity peak or a magnetic field intensity trough; and inquiring the corresponding relation between the preset magnetic field intensity peak value occurrence frequency and the tire position according to the magnetic field intensity peak value occurrence frequency, and identifying the tire position.

As shown in fig. 5 to 8, a curve of the change with time of the magnetic field strength information in a certain period acquired for the magnetic sensor, in which the peak value of the magnetic field strength in the curve is taken as a characteristic point, the tire position can be identified from the number of the peak values of the curve in the rotation period. Wherein, the peak value of the magnetic field intensity is a wave crest of the magnetic field intensity or a wave trough of the magnetic field intensity. The magnetic field intensity peak is defined as the point that the magnetic field intensity value at the current moment is larger than the magnetic field intensity value at the previous moment and the magnetic field intensity value at the later moment is larger than the magnetic field intensity value at the later moment; the magnetic field intensity trough is defined as a point where the magnetic field intensity value at the present time is smaller than the magnetic field intensity value at the previous time and smaller than the magnetic field intensity value at the latter time is the magnetic field intensity trough. Wherein, according to the number of the peak values of the magnetic field intensity value, the tire position is identified as follows:

as shown in fig. 5, when the number of peaks of the curve plotting the magnetic field strength is one, the tire position is identified as the right front wheel, as shown in fig. 6, when the number of peaks of the curve plotting the magnetic field strength is two, the tire position is identified as the left front wheel, as shown in fig. 7, when the number of peaks of the curve plotting the magnetic field strength is three, the tire position is identified as the left rear wheel, as shown in fig. 8, when the number of peaks of the curve plotting the magnetic field strength is four, the tire position is identified as the right rear wheel;

as shown in fig. 5, the tire position is identified as the right front wheel when the number of the valleys of the curve for plotting the magnetic field strength is zero, as shown in fig. 6, the tire position is identified as the left front wheel when the number of the valleys of the curve for plotting the magnetic field strength is one, as shown in fig. 7, the tire position is identified as the left rear wheel when the number of the valleys of the curve for plotting the magnetic field strength is two, and as shown in fig. 8, the tire position is identified as the right rear wheel when the number of the valleys of the curve for plotting the magnetic field strength is three.

When the environment is ideal, the peak value of the magnetic field intensity can be selected as the maximum value of the magnetic field intensity information as the characteristic point.

Optionally, the at least one rotation period includes N rotation periods, N is greater than or equal to 1, and N is an integer; the method comprises the steps of inquiring the corresponding relation between the preset feature point occurrence frequency and the tire position according to the feature point occurrence frequency, and identifying the tire position, wherein the steps comprise: calculating a first average value of the occurrence times of the feature points in each rotation period according to the occurrence times of the feature points in the first M rotation periods in the N rotation periods; m < N, and M is a positive integer; inquiring the corresponding relation between the occurrence frequency of the preset feature points and the tire positions according to the first average value, and identifying the first tire position; calculating a second average value of the occurrence times of the feature points in each rotation period according to the occurrence times of the feature points in the last (N-M) rotation periods in the N rotation periods; inquiring the corresponding relation between the occurrence times of the preset feature points and the tire positions according to the second average value, and identifying the second tire position; and determining the first tire position as the tire position when the second tire position is the same as the first tire position.

For example, N is preferably 5, M is preferably 3, further, the total number of times of occurrence of the feature points in 3 rotation cycles is obtained, an average value, that is, a first average value is calculated as the number of times of occurrence of the feature points in one rotation cycle, a preset correspondence between the number of times of occurrence of the feature points and the tire position is inquired, the current position of the tire is identified as a first position, then the total number of times of occurrence of the feature points in the next 2 rotation cycles is obtained, an average value, that is, a second average value is calculated as the number of times of occurrence of the feature points in one rotation cycle, a correspondence between the number of times of occurrence of the preset feature points and the tire position is inquired, the current position of the tire is identified as a second position, when the first position is the same as the second position, the first position is determined as the tire.

That is, taking the feature point as an example, the corresponding relationship between the preset number of times of feature points and the tire position is taken as an example of a left rear wheel, if the total number of the peaks of the feature points of the first three rotation cycles is 9, the first average value is 3, and then the first position of the corresponding tire is identified as the left rear wheel, and the total number of the peaks of the feature points of the second two rotation cycles is 6, then the second average value is 3, and then the second position of the corresponding tire is identified as the left rear wheel, and thus the position identification of the tire is determined to be correct.

If the total number of wave crests of the feature points of the first three rotation periods is 9, the first average value is 3, the first position of the corresponding tire is identified to be a left rear wheel, the total number of wave crests of the feature points of the second two rotation periods is 4, the second average value is 2, the second position of the corresponding tire is identified to be a left front wheel, the first position is different from the second position, the tire position identification module is restarted until the first position is the same as the second position, and the first position of the tire is determined to be the correct tire position.

If the first position and the second position are still different after the tire position identification module is restarted three times continuously, an error is reported, and a user is informed of checking and maintaining the tire position identification module in time. The error reporting information can be reported to the automobile body through the communication module of the tire pressure monitoring system, and voice broadcasting is carried out through the voice module of the automobile body or the display module of the automobile body displays and warns.

The above-described determination method is also applied to the left front wheel, the right front wheel, and the right rear wheel.

Optionally, before acquiring the magnetic field strength information acquired by the magnetic sensor in at least one rotation cycle, the method further includes: acquiring the centripetal acceleration of each tire; the rotation period of each tire is determined from the centripetal acceleration of each tire.

The acquisition of the centripetal acceleration can be acquired through a tire pressure monitoring system, and after the rotation period of each tire is acquired, the acquisition period of the magnetic sensor for acquiring the magnetic field intensity information can be determined, so that the positions of the tires are identified according to the occurrence frequency of the characteristic points in each acquisition period.

Optionally, before acquiring the centripetal acceleration of each tire, the method further comprises:

acquiring the current state of the vehicle, wherein the current state of the vehicle comprises the current running speed of the vehicle and the time interval between the current starting time of the vehicle and the last stopping time of the vehicle; and when the current running speed is greater than the preset running speed and the time interval is greater than the preset time interval, controlling the tire position identification module to be started.

Wherein the current running speed of the vehicle is preferably 20km/h, and the preset time interval is preferably 30 min.

Specifically, when the current running speed of the vehicle is more than 20km/h and the time interval between the current starting time of the vehicle and the last stopping time of the vehicle exceeds 30min, the tire position identification module is started. That is, when the vehicle speed exceeds 20km/h after the vehicle starts, and the current starting time of the vehicle is, for example, 14 points, and the last stopping time of the vehicle is 13 points, the tire position identifying module is controlled to be turned on.

More specifically, as shown in fig. 9, the tire position identifying method includes the steps of:

s10, starting, judging whether the current running speed is more than 20km/h, if so, executing a step S11; if not, ending;

s11, judging whether the time interval between the current starting time of the vehicle and the last stopping time of the vehicle is larger than the preset time interval, if so, executing the step S12; if not, ending;

wherein the time interval is preferably 30 min.

S12, starting a tire position identification module;

s13, acquiring the centripetal acceleration of the tire;

s14, acquiring the rotation period of the tire;

s15, controlling the magnetic sensor to be started;

s16, acquiring magnetic field intensity information in a rotation period;

s17, judging whether the number of the rotation cycles exceeds 5; if yes, go to step S18, if no, return to step S16;

s18, acquiring a first average value of the occurrence times of the feature points in the previous three rotation periods; acquiring a second average value of the occurrence times of the feature points in the last two rotation periods;

s19, judging whether the first average value is equal to the second average value, if yes, executing the step S20; if not, returning to step S10;

s20, outputting a position of the tire corresponding to the first average value; and (6) ending.

Fig. 10 is a block diagram of a tire pressure monitoring system according to an embodiment of the present invention. As shown in fig. 10, the tire pressure monitoring system 200 includes: the tire position identification module 100 further includes a tire pressure sensor 104, wherein the tire pressure sensor 104 is disposed on the tire and electrically connected to the processing unit 103, and is configured to collect a tire pressure value of the tire; and the communication module 105 is electrically connected with the processing unit 103 and is used for sending the position of the tire and the tire pressure value of the tire to the display module, and the display module is used for displaying the position of the tire and the tire pressure value of the tire.

That is to say, the magnetic sensor 102 acquires the magnetic field strength information generated by the magnetic field generating unit 101, the processing unit 103 determines the position of the tire according to the corresponding relationship between the preset magnetic field strength information and the tire position, then turns off the magnetic sensor 102, controls the pressure sensor 104 to turn on, acquires the tire pressure value of the tire, and further sends the tire position and the tire pressure value of the tire to the vehicle body display module through the communication module 105 for display, and the processing unit 103 presets the upper and lower limit values of the tire pressure, when the tire pressure value acquired by the pressure sensor 104 is greater than the upper limit value or less than the lower limit value, the tire pressure monitoring system 200 sends the information to the vehicle body display module through the communication module 105 for display, and simultaneously performs alarm and warning. Wherein the communication module 105 is an antenna matching network. In addition, the tire pressure monitoring system 200 further includes a battery, a crystal, a low frequency network, and the like, which are matched with the tire pressure monitoring system. Wherein the battery, the crystal and the low frequency network are all electrically connected with the processing unit 103.

Fig. 11 is a block diagram of a vehicle according to an embodiment of the present invention. As shown in fig. 11, the vehicle 300 includes the tire pressure monitoring system 200 described above.

According to the vehicle, the tire pressure monitoring system, the tire position identification module and the tire position identification method, different magnetic field intensity information can be generated corresponding to different tire positions through the magnetic field generation unit arranged on the tire mud guard plate, the magnetic field intensity information is acquired through the magnetic sensor arranged on the tire, then the processing unit inquires the corresponding relation between the preset magnetic field intensity information and the tire position according to the acquired magnetic field intensity information, the tire position is identified, the algorithm steps are simple, the tire position identification speed is high, additional signals of the vehicle are not needed, the positioning is accurate, the tire position does not need to be re-calibrated in a 4S shop after the tire is replaced, and the user experience is good.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.