A tire pressure detection system, a tire pressure detection method, a device, a storage medium and a vehicle
By installing a tire pressure sensor on one wheel of a car and using the relationship between the working parameters of that wheel and other wheels, the tire pressure values of the other wheels can be calculated. This solves the problem of high hardware costs in existing systems, and achieves accurate tire pressure estimation and reduced maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA FAW CO LTD
- Filing Date
- 2025-06-25
- Publication Date
- 2026-07-21
Smart Images
Figure CN120792382B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of automotive technology, and in particular to a tire pressure monitoring system, tire pressure monitoring method, device, storage medium, and vehicle. Background Technology
[0002] Most cars use pneumatic tires, and the tire pressure needs to be maintained within a suitable range. If the tire pressure is too high, it can lead to reduced friction between the tire and the road surface, uneven tire wear, and a high risk of tire blowouts. If the tire pressure is too low, it can cause increased road resistance, higher energy consumption, damage to the tire structure, and damage to the suspension system due to imbalance. Therefore, it is necessary to check the tire pressure regularly during the daily use of a car.
[0003] Previously, external tire pressure measuring tools were typically used to check tire pressure. However, both tire pressure measuring tools provided by repair shops and those provided by car users themselves had inconveniences, such as requiring the vehicle to be stopped for testing. This affected the frequency of tire pressure measurement, leaving the car at a high risk of abnormal tire pressure for a long time.
[0004] With the development of automotive technology, more and more cars are using tire pressure monitoring systems installed in the vehicle. This allows for tire pressure monitoring without the need for external equipment, improving the convenience and real-time nature of tire pressure monitoring. This helps car users pay attention to the tire pressure and perform appropriate maintenance to keep the tire pressure within a suitable range, thus ensuring the safety of the vehicle.
[0005] However, vehicle-mounted tire pressure monitoring systems require tire pressure sensors installed at the wheels to detect tire pressure data. The domain controller, which processes this data, is typically located away from the wheels, such as in the engine compartment. To enable communication between the tire pressure sensors and the domain controller, wireless communication is generally used. A wireless transmitter is installed at each wheel and connected to the tire pressure sensor. The transmitter transmits the detected tire pressure data via radio signals. A wireless receiver, located in the engine compartment or elsewhere, connects to the domain controller. The receiver receives the radio signals from the transmitter, converts them into a data format that the domain controller can process, and then sends the data to the domain controller. To ensure the operation of the tire pressure sensors and wireless transmitter at the wheels, a power supply module is also required. This module typically uses batteries, and replacing the batteries requires removing the wheels.
[0006] Therefore, tire pressure monitoring systems installed in vehicles require hardware infrastructure support, often resulting in relatively high hardware and maintenance costs. This is especially true since cars have multiple wheels, each requiring its own hardware structure, leading to costs several times higher. Summary of the Invention
[0007] In view of the technical problems of high hardware cost and complex maintenance of current tire pressure monitoring systems, the purpose of this invention is to provide a tire pressure monitoring system, tire pressure monitoring method, device, storage medium and vehicle.
[0008] On one hand, embodiments of the present invention include a tire pressure monitoring system, the tire pressure monitoring system comprising:
[0009] Tire pressure sensor; the tire pressure sensor is used to detect the tire pressure of the first wheel in the vehicle and obtain the measured tire pressure value;
[0010] Multiple sensor groups; the sensor groups include multiple parameter sensors, each of the sensor groups is used to detect a corresponding wheel in the vehicle to obtain a set of working parameters; the set of working parameters includes the working parameters detected by each of the parameter sensors in the sensor group;
[0011] A domain controller; the domain controller is used in a first detection mode to determine the calculated tire pressure value of the second wheel based on the measured tire pressure value, the working parameter group corresponding to the first wheel, and the working parameter group corresponding to the second wheel; the second wheel is a wheel other than the first wheel in the same vehicle.
[0012] Furthermore, the domain controller is used in the second detection mode to acquire, for any wheel in the vehicle, multiple measured tire pressure values or multiple calculated tire pressure values of the wheel, perform historical data compensation processing on the multiple tire pressure values or the multiple calculated tire pressure values, and obtain the predicted tire pressure value of the wheel.
[0013] The domain controller is used in the second detection mode to obtain the tire pressure difference between the predicted tire pressure value and the measured tire pressure value of the first wheel, and to execute an alarm when the tire pressure difference is greater than a threshold.
[0014] Furthermore, the domain controller is used to detect the working validity of the tire pressure sensor. When the tire pressure sensor is detected to be valid, the first detection mode is triggered. When the tire pressure sensor is detected to be faulty, the second detection mode is triggered.
[0015] Furthermore, the tire pressure sensor is used to detect at multiple sampling times to obtain the measured tire pressure value in time series form;
[0016] The sensor group is used to perform detection at the same sampling time to obtain the working parameter group in time series form.
[0017] Further, determining the calculated tire pressure value of the second wheel based on the measured tire pressure value, the working parameter group corresponding to the first wheel, and the working parameter group corresponding to the second wheel includes:
[0018] All the aforementioned working parameters are classified into either a first type of parameter or a second type of parameter;
[0019] Clustering is performed on the portion of each working parameter group that belongs to the first type of parameter, and at least one cluster center is obtained. A corresponding working condition type is determined based on each cluster center.
[0020] For any of the measured tire pressure values, the measured tire pressure value is marked according to the working condition type corresponding to the working parameter group of the first wheel detected at the same sampling time, and the working parameter belonging to the second type parameter in the working parameter group of the first wheel.
[0021] For any of the second wheels, the measured tire pressure values marked with the same working condition type are selected according to the working condition type corresponding to the working parameter group of the second wheel. The selected measured tire pressure values and the marked working parameters are fitted to obtain the tire pressure value-second type parameter fitting relationship. The tire pressure value-second type parameter fitting relationship and the working parameters of the second wheel belonging to the second type parameter are used to determine the calculated tire pressure value of the second wheel.
[0022] Furthermore, the step of classifying all the operating parameters into a first type of parameter or a second type of parameter includes:
[0023] Iterate through all parameter types;
[0024] For any of the parameter types, the working parameters belonging to the parameter type detected by the same sensor group are grouped into the same set. When the intersection of all sets is empty, all the working parameters belonging to the parameter type are classified as the first type of parameter. Conversely, when the intersection of all sets is not empty, all the working parameters belonging to the parameter type are classified as the second type of parameter.
[0025] On the other hand, embodiments of the present invention include a tire pressure detection method, the tire pressure detection method comprising:
[0026] The tire pressure of the first wheel in the vehicle is detected to obtain the actual tire pressure value;
[0027] Each wheel in the vehicle is inspected separately to obtain a set of working parameters for each wheel; the set of working parameters includes multiple working parameters.
[0028] In the first detection mode, the tire pressure calculation value of the second wheel is determined based on the measured tire pressure value, the working parameter group corresponding to the first wheel, and the working parameter group corresponding to the second wheel; the second wheel is a wheel other than the first wheel in the same vehicle.
[0029] On the other hand, embodiments of the present invention include a computer device including a memory and a processor, the memory being used to store at least one program, and the processor being used to load at least one program to execute the tire pressure detection method in the embodiments.
[0030] On the other hand, embodiments of the present invention include a computer-readable storage medium storing a processor-executable program, which, when executed by a processor, is used to perform the tire pressure detection method in the embodiments.
[0031] On the other hand, embodiments of the present invention include a vehicle that includes the tire pressure monitoring system described in the embodiments.
[0032] The beneficial effects of this invention are as follows: The tire pressure monitoring system in the embodiments obtains a known and accurate measured tire pressure value by using a tire pressure sensor on the first wheel. Based on the measured tire pressure value and the working parameter set of the first wheel, the relationship between the tire pressure of the wheel and the working parameter set is determined. For any second wheel, a calculated tire pressure value is determined based on its working parameter set, thereby obtaining an accurate estimate of the tire pressure of the second wheel. This achieves the goal of obtaining the calculated tire pressure value of the second wheel without installing a tire pressure sensor on it, saving on tire pressure sensors and related hardware components, reducing usage and maintenance costs, improving the usability of the vehicle tire pressure monitoring system, and achieving a balance between cost and tire pressure data accuracy. Moreover, by processing the measured tire pressure value according to the working parameter sets of the first and second wheels to obtain the calculated tire pressure value, the intrinsic relationship between the measured tire pressure value and the tire's inherent properties can be more comprehensively explored, thus facilitating the acquisition of a calculated tire pressure value that is closer to the actual tire pressure of the second wheel. Attached Figure Description
[0033] Figure 1 This is a schematic diagram of the relevant technologies in the embodiments;
[0034] Figure 2 This is a schematic diagram of a vehicle where a tire pressure monitoring system can be applied in the embodiment;
[0035] Figure 3 This is a schematic diagram of the tire pressure monitoring system in the embodiment;
[0036] Figure 4 This is a schematic diagram of the first detection mode and the second detection mode in the embodiment;
[0037] Figure 5This is a schematic diagram of the steps of the tire pressure detection method in the embodiment;
[0038] Figure 6 This is a schematic diagram illustrating the principle of determining whether a working parameter belongs to the first type of parameter in the embodiment.
[0039] Figure 7 This is a schematic diagram illustrating the principle of determining whether a working parameter belongs to the second type of parameter in the embodiment.
[0040] Figure 8 This is a schematic diagram illustrating the principle of clustering the first type of parameters in the embodiment;
[0041] Figure 9 This is a schematic diagram illustrating the principle of marking the measured tire pressure values according to the operating condition type and the second type of parameters in the embodiment.
[0042] Figure 10 This is a schematic diagram illustrating the principle of obtaining the tire pressure value of the second wheel and the fitting relationship of the second type of parameter in the embodiment.
[0043] Figure 11 This is a schematic diagram illustrating the principle of obtaining the tire pressure calculation value of the second wheel in the embodiment.
[0044] Figure 12 This is a schematic diagram showing the connection relationship between the domain controller and the central speed controller in the embodiment. Detailed Implementation
[0045] Terminology Explanation:
[0046] Direct tire pressure monitoring: such as Figure 1 As shown, tire pressure sensors are installed in locations such as inside the tires of the wheels to collect tire pressure data in real time. The data is then wirelessly transmitted to the processor via radio frequency. Direct tire pressure detection uses physical hardware components to detect tire pressure on the wheels, and the obtained tire pressure data is the actual measured value. The advantage of direct tire pressure detection is that it achieves high detection accuracy through hardware measurement. The disadvantage is that it requires corresponding hardware components for each wheel, resulting in high hardware costs and subsequent maintenance costs.
[0047] Indirect tire pressure monitoring: Since tire pressure affects the wheel's aspect ratio and diameter, ultimately influencing its rotational speed and other operating parameters, there is a correlation between wheel speed and tire pressure. Tire pressure can be calculated by detecting wheel speed, thus enabling tire pressure monitoring. In other words, indirect tire pressure monitoring does not use physical hardware components to detect air pressure; instead, it uses data measured by hardware components for other purposes (such as detecting rotational speed) to calculate tire pressure. The advantage of indirect tire pressure monitoring is that it eliminates the need for hardware components at the wheel to detect tire pressure, reducing hardware and maintenance costs (hardware components for detecting rotational speed and other purposes are already present in the vehicle and their cost is not included in the tire pressure monitoring function). The disadvantage is that the tire pressure data is not measured but calculated, and its accuracy is limited by the coarseness of the conversion relationship.
[0048] Considering the advantages and disadvantages of both fully direct tire pressure monitoring and fully indirect tire pressure monitoring, this embodiment provides a tire pressure monitoring system.
[0049] In this embodiment, the tire pressure monitoring system can be applied to Figure 2 The car shown. (Refer to...) Figure 2 The vehicle has four wheels: a left front wheel, a right front wheel, a left rear wheel, and a right rear wheel.
[0050] Reference Figure 3 The tire pressure monitoring system includes a domain controller, tire pressure sensors, and sensor groups such as sensor group 0, sensor group 1, sensor group 2, and sensor group 3. The domain controller and tire pressure sensors are physical hardware components, while each sensor group can be a physical hardware component or a software functional module.
[0051] In this embodiment, one wheel is selected as the first wheel, that is, the wheel on which the tire pressure sensor is installed, and the other wheels are the second wheels, that is, the wheels on which the tire pressure sensor is not installed. For example, refer to Figure 2 and Figure 3 The left front wheel is called the first wheel, and the right front wheel, left rear wheel, and right rear wheel are called the second wheels.
[0052] Reference Figure 3 The tire pressure sensor installed on the first wheel (left front wheel) can detect the tire pressure of the first wheel and obtain the actual tire pressure value. The actual tire pressure value is the data obtained by the tire pressure sensor measuring the tire pressure of the first wheel. Since the accuracy of the tire pressure sensor can be made very high, the error of the actual tire pressure value can be ignored.
[0053] Reference Figure 3The sensor group includes multiple parameter sensors. For example, taking sensor group 0 as an example, the speed sensor detects the first wheel (left front wheel) to obtain a speed-type working parameter (representing the rotational speed of the first wheel (left front wheel)), the acceleration sensor detects the first wheel (left front wheel) to obtain an acceleration-type working parameter (representing the rotational acceleration of the first wheel (left front wheel)), and the turning radius sensor detects the first wheel (left front wheel) to obtain a turning radius-type working parameter (representing the turning radius of the first wheel (left front wheel)).
[0054] The various types of operating parameters detected by sensor group 0, such as rotational speed type, acceleration type, and turning radius type, constitute the operating parameter group of the first wheel (left front wheel).
[0055] Similarly, sensor group 1 detects various types of operating parameters such as speed type, acceleration type, and turning radius type for the second wheel 1 (right front wheel), forming the operating parameter group for the second wheel 1 (right front wheel); sensor group 2 detects various types of operating parameters such as speed type, acceleration type, and turning radius type for the second wheel 2 (left rear wheel), forming the operating parameter group for the second wheel 2 (left rear wheel); sensor group 3 detects various types of operating parameters such as speed type, acceleration type, and turning radius type for the second wheel 3 (right rear wheel), forming the operating parameter group for the second wheel 3 (right rear wheel).
[0056] In this embodiment, refer to Figure 3 The tire pressure sensor can be connected to the domain controller via a wireless communication protocol, while the sensor group can be connected to the domain controller via a wired communication protocol such as CAN. Since CAN and other communication protocols can power the sensor group, there is no need for battery replacement or other maintenance.
[0057] In this embodiment, different sensors within the same sensor group can be reused. For example, in sensor group 0, the rotational speed data detected by the rotational speed sensor can be differentiated with respect to time to obtain acceleration data, thus realizing the function of an acceleration sensor. That is, the acceleration sensor in sensor group 0 does not require corresponding physical hardware components. Different sensor groups can also be reused. For example, the domain controller can call the vehicle's positioning data to calculate the vehicle's driving trajectory, and calculate the turning radius of each wheel based on the driving trajectory, thus realizing the function of the turning radius sensors in all sensor groups. That is, the turning radius sensors in each sensor group do not require corresponding physical hardware components. Therefore, Figure 3 The various sensor groups and sensors within the vehicle can represent the corresponding functional modules of the car, without necessarily requiring the installation of corresponding physical hardware components.
[0058] In this embodiment, the domain controller operates in the following mode: Figure 4 As shown. (Refer to...) Figure 4 The domain controller can detect the functionality of the tire pressure sensor installed on the first wheel (left front wheel). If the tire pressure sensor is detected as valid, for example, if the tire pressure sensor is working properly without fault, then the domain controller executes the first detection mode. If the tire pressure sensor is detected as faulty, for example, if the tire pressure sensor malfunctions and reports an error, then the domain controller executes the second detection mode.
[0059] In this embodiment, the tire pressure detection method executed by the domain controller in the first detection mode is as follows: Figure 5 As shown, it includes the following steps:
[0060] S1. Detect the tire pressure of the first wheel in the vehicle and obtain the measured tire pressure value;
[0061] S2. Detect each wheel in the vehicle to obtain the working parameter set corresponding to each wheel;
[0062] S3. In the first detection mode, the calculated tire pressure value of the second wheel is determined based on the measured tire pressure value, the working parameter group corresponding to the first wheel, and the working parameter group corresponding to the second wheel.
[0063] In step S1, the tire pressure sensor can be used to measure the pressure at t1, t2, t3...t n The tire pressure of the first wheel is measured at different sampling times to obtain the measured tire pressure values 1, 2, 3, ... n The tire pressure readings are presented in time series format. The tire pressure sensors transmit the detected tire pressure values to the domain controller in real time.
[0064] In step S2, each sensor group can be configured at t1, t2, t3...t n The working parameters of the corresponding wheels are detected at the sampling time to obtain a time series of working parameter groups, and the detected working parameter groups are sent to the domain controller in real time.
[0065] For example, sensor group 0 at t1, t2, t3...t n At each sampling time, the first wheel (left front wheel) is detected to obtain (speed 01, acceleration 01, turning radius 01), (speed 02, acceleration 02, turning radius 02), (speed 03, acceleration 03, turning radius 03)... (speed 0... n acceleration 0 n Turning radius 0 n Working parameter groups in time series form, etc.
[0066] Sensor group 1 at t1, t2, t3...tn At each sampling time, the second wheel 1 (right front wheel) is detected to obtain (speed 11, acceleration 11, turning radius 11), (speed 12, acceleration 12, turning radius 12), (speed 13, acceleration 13, turning radius 13)... (speed 1... n acceleration 1 n Turning radius 1 n Working parameter groups in time series form, etc.
[0067] Sensor group 2 at t1, t2, t3...t n At each sampling time, the second wheel 2 (left rear wheel) is detected to obtain (rotation speed 21, acceleration 21, turning radius 21), (rotation speed 22, acceleration 22, turning radius 22), (rotation speed 23, acceleration 23, turning radius 23)... (rotation speed 21). n acceleration 2 n Turning radius 2 n Working parameter groups in time series form, etc.
[0068] Sensor group 3 at t1, t2, t3...t n At each sampling time, the second wheel 3 (right rear wheel) is detected to obtain (speed 31, acceleration 31, turning radius 31), (speed 32, acceleration 32, turning radius 32), (speed 33, acceleration 33, turning radius 33)... (speed 31, acceleration 32, turning radius 33)... (speed 32, acceleration 33, turning radius 33)... n acceleration 3 n Turning radius 3 n Working parameter groups in time series form, such as )
[0069] In step S3, since the tire pressure sensor can work normally in the first detection mode, the measured tire pressure value detected by the tire pressure sensor is accurate, which represents the actual tire pressure of the first wheel (left front wheel). For any other second wheel, taking the second wheel 1 (right front wheel) as an example, the domain controller can map the measured tire pressure value to the calculated tire pressure value of the second wheel 1 (right front wheel) according to the relationship between the working parameter group corresponding to the first wheel and the working parameter group corresponding to the second wheel 1 (right front wheel).
[0070] In this embodiment, the principle of executing steps S1-S3 is as follows: the air filled into the wheel is part of the wheel itself, therefore the tire pressure is a property of the wheel itself, affecting the working parameter set generated when the wheel is working. Wheels installed on the same vehicle are usually from the same manufacturer and model, so the relationship between tire pressure and the working parameter set can be considered the same. For the first wheel equipped with a tire pressure sensor, its tire pressure is a known and accurate measured value. Therefore, the relationship between the tire pressure and the working parameter set of this wheel can be determined based on the measured tire pressure value and the first wheel's working parameter set. This relationship also holds true for any second wheel. Therefore, for any second wheel, a calculated tire pressure value can be determined based on its working parameter set. The calculated tire pressure value represents an accurate estimate of the second wheel's tire pressure obtained based on the physical relationship between tire pressure and the working parameter set. This allows for obtaining the calculated tire pressure value of the second wheel without installing a tire pressure sensor, thus saving on tire pressure sensor costs. For example, as... Figure 3 As shown, only one of the four wheels, namely the first wheel, needs to be equipped with a tire pressure sensor. Compared with installing tire pressure sensors on all wheels, this reduces the number of tire pressure sensors, corresponding wireless transmitters, power supply modules, and other hardware by 75%. This reduces maintenance costs such as battery replacements and improves the ease of use of the vehicle's tire pressure monitoring system, achieving a balance between cost and tire pressure data accuracy. Moreover, by processing the measured tire pressure value based on the working parameter group (containing multiple working parameters, rather than a single working parameter) of the first and second wheels to obtain the calculated tire pressure value, it is possible to more comprehensively explore the intrinsic relationship between the measured tire pressure value and the tire's own properties, thereby facilitating the acquisition of a calculated tire pressure value that is closer to the actual tire pressure of the second wheel.
[0071] In this embodiment, when the domain controller executes step S3, which is to determine the calculated tire pressure value of the second wheel based on the measured tire pressure value, the working parameter group corresponding to the first wheel, and the working parameter group corresponding to the second wheel, the following steps can be performed:
[0072] S301. Classify all working parameters into either type I parameters or type II parameters;
[0073] S302. Cluster the parameters belonging to the first type in each working parameter group to obtain at least one cluster center, and determine a corresponding working condition type based on each cluster center;
[0074] S303. For any measured tire pressure value, mark the measured tire pressure value according to the working condition type corresponding to the working parameter group of the first wheel detected at the same sampling time, and the working parameters belonging to the second type of parameters in the working parameter group of the first wheel.
[0075] S304. For any second wheel, based on the working condition type corresponding to the working parameter group of the second wheel, select the measured tire pressure values marked with the same working condition type, fit the selected measured tire pressure values and the marked working parameters to obtain the tire pressure value-second type parameter fitting relationship, and determine the calculated tire pressure value of the second wheel based on the tire pressure value-second type parameter fitting relationship and the working parameters of the second wheel that belong to the second type parameter.
[0076] In this embodiment, in step S2, each sensor group obtains various types of operating parameters, such as rotational speed, acceleration, and turning radius. When executing step S301, it can be determined whether these types of operating parameters belong to the first type or the second type.
[0077] For example, such as Figure 6 As shown, step S301 is executed for working parameters of the turning radius type to determine whether the working parameter of the turning radius type belongs to the first type parameter or the second type parameter. (Refer to...) Figure 6 The turning radius detected by sensor group 0 is 01, 02, 03... turning radius 0. n Each of these four sets (ranges of values) forms a set and occupies a certain range of values. Similarly, the turning radii detected by sensor group 1, sensor group 2, and sensor group 3 each form a set and occupy a certain range of values. The intersection of these four sets (ranges of values) is an empty set. Therefore, the working parameter of the turning radius type is determined as the first type parameter.
[0078] In other words, the first type of parameter is a parameter where "the working conditions of each wheel differ significantly in this type, resulting in no overlap in the working parameters generated in this type." For example, such as... Figure 6 As shown, since the turning radius of wheels at different positions on a car varies greatly (for example, the front wheels, which are steering wheels, can produce a larger turning radius, while the rear wheels can only produce a smaller turning radius), the working parameter of the turning radius type belongs to the first type of parameter.
[0079] For example, such as Figure 7 As shown, step S301 is executed for operating parameters of speed type to determine whether the operating parameter of speed type belongs to the first type parameter or the second type parameter. (Refer to...) Figure 7 The sensor group 0 detected rotational speeds 01, 02, 03... 0. n Each of these four sets (ranges of values) forms a set and occupies a certain range of values. Similarly, the rotational speeds detected by sensor group 1, sensor group 2, and sensor group 3 each form a set and occupy a certain range of values. The intersection of these four sets (ranges of values) is a non-empty set. Therefore, the operating parameter of the rotational speed type is determined as the second type parameter.
[0080] In other words, the second type of parameter is a parameter where "the working conditions of each wheel in this type may deviate, but the differences are small, or even non-existent, resulting in an overlap in the working parameters generated in this type." For example, such as... Figure 7 As shown, since the rotational speeds of the wheels at different positions on the car are relatively small (the errors may be caused by uneven ground surfaces where the wheels are located), the turning radius type of working parameters belongs to the second type of parameters.
[0081] In this embodiment, it is assumed that the measured acceleration type working parameters are the same as the turning radius type working parameters, and also belong to the first type of parameters.
[0082] In step S302, such as Figure 8 As shown, for sensor group 0, the values detected are (rotation speed 01, acceleration 01, turning radius 01), (rotation speed 02, acceleration 02, turning radius 02), (rotation speed 03, acceleration 03, turning radius 03)... (rotation speed 01). n acceleration 0 n Turning radius 0 n The working parameter group, etc., takes the part belonging to the first type of parameter, that is, the part of acceleration type and turning radius type, i.e. (acceleration 01, turning radius 01), (acceleration 02, turning radius 02), (acceleration 03, turning radius 03)... (acceleration 0... n Turning radius 0 n Similarly, for the working parameter groups detected by other sensor groups, the portion belonging to the first type of parameter is also taken. The taken portion can be represented in coordinate form, thereby enabling the execution of a clustering algorithm to obtain at least one cluster center. In this embodiment, refer to Figure 8 Three cluster centers were obtained, and each cluster center determined a working condition type, thus obtaining working condition type 1, working condition type 2 and working condition type 3.
[0083] In step S303, such as Figure 9 As shown, for the measured tire pressure value 1 detected by the tire pressure sensor, the first type of parameters (acceleration 01, turning radius 01) of the first wheel detected at the same time, i.e., t1, can be obtained. Based on... Figure 8 The clustering results shown determine the corresponding operating condition type (specifically, operating condition type 1). The second type parameter, rotational speed 01, of the first wheel detected at the same time (t1) is obtained. The measured tire pressure value 1 is represented as the position on the vertical axis, and the rotational speed 01 is represented as the position on the horizontal axis, thus determining a point. This point is then marked using the corresponding operating condition type (operating condition type 1), thereby marking the measured tire pressure value 1. Similarly, for the measured tire pressure values 2, 3, ... detected by the tire pressure sensor, ... nThe corresponding markers are also made to obtain... Figure 9 The labeling results are shown.
[0084] In step S304, taking the second wheel 2 (left rear wheel) as an example, according to the working parameters of the second wheel 2 (left rear wheel) (acceleration 21, turning radius 21), (acceleration 22, turning radius 22), (acceleration 23, turning radius 23)... (acceleration 2... n Turning radius 2 n ),exist Figure 8 The clustering results shown identify all operating conditions corresponding to the second wheel 2 (left rear wheel). In this embodiment, it is assumed that the operating parameters of the second wheel 2 (left rear wheel) belong to operating condition type 1 and operating condition type 3, respectively, and that there are no operating parameters belonging to operating condition type 2. Thus, as... Figure 10 As shown, in Figure 9 Based on the labeling results shown, the measured tire pressure values that are labeled with the same working condition type as the second wheel 2 (left rear wheel), namely working condition type 1 and working condition type 3, are selected. In other words, the measured tire pressure values corresponding to working condition type 2 are deleted. The selected measured tire pressure values and corresponding working parameters are fitted using a fitting algorithm (such as the least squares method) to obtain the tire pressure value-second type parameter fitting relationship. The tire pressure value-second type parameter fitting relationship represents the functional relationship between the second type parameter and the tire pressure value.
[0085] In step S304, refer to Figure 11 After the sensor group 2 measures a working parameter (speed) belonging to the second type of parameter on the second wheel 2 (left rear wheel), the tire pressure of the second wheel 2 (left rear wheel) can be calculated based on the speed, the second type of parameter and the tire pressure value.
[0086] In this embodiment, the principle of executing steps S301-S304 is as follows: by classifying the working parameters detected from all wheels, the obtained first type of parameters represents working parameters with large differences in working conditions among different wheels and a relatively discrete distribution, and the second type of parameters represents working parameters with small differences in working conditions among different wheels and a relatively concentrated distribution. For any second wheel, according to the working condition type of the first type of parameters of the second wheel, the measured tire pressure value of the same working condition type is selected and fitted with the corresponding second type of parameters. In fact, the measured tire pressure values of different working condition types are deleted (not participating in the fitting). The obtained tire pressure value-second type parameter fitting relationship is more consistent with the working condition of the second wheel, which is conducive to obtaining a more accurate tire pressure calculation value.
[0087] Therefore, by executing steps S301-S304, the different working conditions of different wheels on the vehicle are considered (for example, the front wheels generally have a larger turning radius than the rear wheels, and the drive wheels generally have a greater acceleration than the non-drive wheels). For any second wheel, the measured tire pressure values that correspond to the working conditions that it can experience are selected for fitting. Since the working conditions that different second wheels can experience are generally different, different fitting methods are set for different wheels to obtain different tire pressure value-second type parameter fitting relationships. The tire pressure value-second type parameter fitting relationship of each second wheel is obtained according to its own characteristics, which is conducive to refining the determination of the tire pressure calculation values of different second wheels and obtaining a more detailed tire pressure monitoring effect.
[0088] In this embodiment, if the tire pressure sensor fails, causing the domain controller to operate in the second detection mode, the domain controller will be unable to access the tire pressure sensor to obtain new measured tire pressure values. Therefore, the domain controller can perform historical data compensation processing based on multiple measured tire pressure values previously determined in the first detection mode (if the wheel is the first wheel) or multiple calculated tire pressure values (if the wheel is the second wheel) to obtain the predicted tire pressure value for that wheel.
[0089] For example, taking the first wheel as an example, in the second detection mode, the domain controller can perform a moving average filter on the previously detected time series tire pressure measurement values of the first wheel to obtain the predicted tire pressure value of the first wheel. This allows the tire pressure detection of the wheel to be maintained even after the tire pressure sensor fails, thus realizing a failure redundancy mechanism.
[0090] In this embodiment, in the second detection mode, the domain controller can also calculate the tire pressure difference (taking the absolute value of the difference) between the predicted tire pressure value of the first wheel and any previously detected measured tire pressure value, and compare the tire pressure difference with a threshold. If the tire pressure difference is greater than the threshold, the domain controller can issue an alarm. Specifically, refer to... Figure 12 The domain controller connects to the central speed controller (CSC) via Ethernet. When the domain controller executes an alarm, it can send a fault code to the CSC, which in turn causes the CSC to limit the vehicle's speed, reducing the safety risks caused by abnormal air pressure and thus achieving multi-level safety verification.
[0091] This embodiment provides a tire pressure detection method, referring to... Figure 5 The tire pressure monitoring method includes the following steps:
[0092] S1. Detect the tire pressure of the first wheel in the vehicle and obtain the measured tire pressure value;
[0093] S2. Detect each wheel in the vehicle separately to obtain the working parameter set corresponding to each wheel; the working parameter set includes multiple working parameters.
[0094] S3. In the first detection mode, the tire pressure calculation value of the second wheel is determined based on the measured tire pressure value, the working parameter group corresponding to the first wheel, and the working parameter group corresponding to the second wheel; the second wheel is the wheel other than the first wheel in the same vehicle.
[0095] Tire pressure monitoring can be performed by a domain controller.
[0096] In this embodiment, the domain controller used can be a chassis domain controller (PDC), which can reuse resources such as high-performance computing units and CAN FD high-speed communication interfaces to realize real-time sharing of sensor data with modules such as the braking system and ESC. It can also be powered by a unified power management module, reducing system power consumption and improving electromagnetic compatibility.
[0097] In this embodiment, execution can be performed Figure 5 The computer program for the tire pressure monitoring method shown is stored in a computer device or a computer-readable storage medium, so that the tire pressure monitoring method can be executed by the computer device.
[0098] In this embodiment, the tire pressure monitoring system can be installed in the vehicle, making the tire pressure monitoring system an integral part of the vehicle. This allows the vehicle to achieve the effect of multi-vehicle tire pressure monitoring by saving hardware costs.
[0099] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.
[0100] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. Furthermore, the descriptions of "upper," "lower," "left," and "right" used in this disclosure are only relative to the relative positional relationships of the components of this disclosure in the accompanying drawings. The singular forms "a" and "the" used in this disclosure are also intended to include the plural forms, unless the context clearly indicates otherwise. Moreover, unless otherwise defined, all technical and scientific terms used in this embodiment have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this embodiment specification is only for describing particular embodiments and is not intended to limit the invention. The term "and / or" as used in this embodiment includes any combination of one or more of the associated listed items.
[0101] It should be understood that although the terms first, second, third, etc., may be used to describe various elements in this disclosure, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from each other. For example, a first element may also be referred to as a second element without departing from the scope of this disclosure, and similarly, a second element may also be referred to as a first element. The use of any and all instances or exemplary language (“e.g.,” “such as,” etc.) provided in this embodiment is intended only to better illustrate embodiments of the invention and, unless otherwise required, does not impose a limitation on the scope of the invention.
[0102] It should be recognized that embodiments of the present invention can be implemented or carried out by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable storage medium. The method can be implemented using standard programming techniques—including a non-transitory computer-readable storage medium configured with a computer program, wherein such a storage medium causes the computer to operate in a specific and predefined manner—according to the methods and drawings described in the specific embodiments. Each program can be implemented in a high-level procedural or object-oriented programming language to communicate with the computer system. However, if desired, the program can be implemented in assembly or machine language. In any case, the language can be a compiled or interpreted language. Furthermore, for this purpose, the program can run on a programmed application-specific integrated circuit (ASIC).
[0103] Furthermore, the procedures described in this embodiment can be performed in any suitable order unless otherwise indicated by this embodiment or otherwise obviously contradict the context. The procedures (or variations and / or combinations thereof) described in this embodiment can be executed under the control of one or more computer systems configured with executable instructions, and can be implemented by hardware or a combination thereof as code (e.g., executable instructions, one or more computer programs, or one or more applications) that commonly executes on one or more processors. A computer program includes a plurality of instructions executable by one or more processors.
[0104] Furthermore, the method can be implemented in any suitable type of computing platform, including but not limited to personal computers, minicomputers, mainframes, workstations, networked or distributed computing environments, standalone or integrated computer platforms, or in communication with charged particle tools or other imaging devices, etc. Aspects of the invention can be implemented as machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optical read and / or write storage medium, RAM, ROM, etc., such that it is readable by a programmable computer, and when the storage medium or device is read by the computer, it can be used to configure and operate the computer to perform the processes described herein. Furthermore, the machine-readable code, or portions thereof, can be transmitted via wired or wireless networks. The invention of this embodiment includes these and other different types of non-transitory computer-readable storage media when such media comprises instructions or programs that implement the steps above in conjunction with a microprocessor or other data processor. When programmed according to the methods and techniques of the invention, the invention also includes the computer itself.
[0105] A computer program can be applied to input data to perform the functions of this embodiment, thereby transforming the input data to generate output data stored in non-volatile memory. The output information can also be applied to one or more output devices, such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including specific visual depictions of physical and tangible objects generated on the display.
[0106] The above are merely preferred embodiments of the present invention. The present invention is not limited to the above-described embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention, as long as they achieve the technical effects of the present invention by the same means, should be included within the scope of protection of the present invention. Within the scope of protection of the present invention, the technical solutions and / or implementation methods can have various modifications and variations.
Claims
1. A tire pressure monitoring system, characterized in that, The tire pressure monitoring system includes: Tire pressure sensor; the tire pressure sensor is used to detect the tire pressure of the first wheel in the vehicle and obtain the measured tire pressure value; Multiple sensor groups; the sensor groups include multiple parameter sensors, each of the sensor groups is used to detect a corresponding wheel in the vehicle to obtain a set of working parameters; the set of working parameters includes the working parameters detected by each of the parameter sensors in the sensor group; A domain controller; the domain controller is used in a first detection mode to determine the calculated tire pressure value of the second wheel based on the measured tire pressure value, the working parameter group corresponding to the first wheel, and the working parameter group corresponding to the second wheel; the second wheel is a wheel other than the first wheel in the same vehicle; The domain controller is used in the second detection mode to acquire multiple measured tire pressure values or multiple calculated tire pressure values for any wheel in the vehicle, perform historical data compensation processing on the multiple measured tire pressure values or multiple calculated tire pressure values, and obtain the predicted tire pressure value for the wheel. The domain controller is used in the second detection mode to obtain the tire pressure difference between the predicted tire pressure value and the measured tire pressure value of the first wheel, and to execute an alarm when the tire pressure difference is greater than a threshold. The domain controller is used to detect the working validity of the tire pressure sensor. When the tire pressure sensor is detected to be valid, the first detection mode is triggered. When the tire pressure sensor is detected to be invalid, the second detection mode is triggered. The step of determining the calculated tire pressure value of the second wheel based on the measured tire pressure value, the working parameter group corresponding to the first wheel, and the working parameter group corresponding to the second wheel includes: All the aforementioned working parameters are classified into either a first type of parameter or a second type of parameter; Clustering is performed on the portion of each working parameter group that belongs to the first type of parameter, and at least one cluster center is obtained. A corresponding working condition type is determined based on each cluster center. For any of the measured tire pressure values, the measured tire pressure value is marked according to the working condition type corresponding to the working parameter group of the first wheel detected at the same sampling time, and the working parameter belonging to the second type parameter in the working parameter group of the first wheel. For any of the second wheels, the measured tire pressure values marked with the same working condition type are selected according to the working condition type corresponding to the working parameter group of the second wheel. The selected measured tire pressure values and the marked working parameters are fitted to obtain the tire pressure value-second type parameter fitting relationship. The tire pressure value-second type parameter fitting relationship and the working parameters of the second wheel belonging to the second type parameter are used to determine the calculated tire pressure value of the second wheel.
2. The tire pressure monitoring system according to claim 1, characterized in that: The tire pressure sensor is used to detect at multiple sampling times to obtain the measured tire pressure value in time series form; The sensor group is used to perform detection at the same sampling time to obtain the working parameter group in time series form.
3. The tire pressure monitoring system according to claim 1, characterized in that, The step of classifying all the working parameters into a first type of parameter or a second type of parameter includes: Iterate through all parameter types; For any of the parameter types, the working parameters belonging to the parameter type detected by the same sensor group are grouped into the same set. When the intersection of all sets is empty, all the working parameters belonging to the parameter type are classified as the first type of parameter. Conversely, when the intersection of all sets is not empty, all the working parameters belonging to the parameter type are classified as the second type of parameter.
4. A tire pressure detection method, characterized in that, The tire pressure detection method includes: The tire pressure of the first wheel in the vehicle is detected to obtain the actual tire pressure value; Each wheel in the vehicle is inspected separately to obtain a set of working parameters for each wheel; the set of working parameters includes multiple working parameters. In the first detection mode, the calculated tire pressure value of the second wheel is determined based on the measured tire pressure value, the working parameter group corresponding to the first wheel, and the working parameter group corresponding to the second wheel; the second wheel is a wheel other than the first wheel in the same vehicle. In the second detection mode, for any wheel in the vehicle, multiple measured tire pressure values or multiple calculated tire pressure values of the wheel are obtained, and historical data compensation processing is performed on the multiple measured tire pressure values or the multiple calculated tire pressure values to obtain the predicted tire pressure value of the wheel. In the second detection mode, the tire pressure difference between the predicted tire pressure value and the measured tire pressure value of the first wheel is obtained. When the tire pressure difference is greater than a threshold, an alarm is triggered. The system detects the effectiveness of the tire pressure sensor. When the tire pressure sensor is detected to be effective, the first detection mode is triggered. When the tire pressure sensor is detected to be malfunctioning, the second detection mode is triggered. The step of determining the calculated tire pressure value of the second wheel based on the measured tire pressure value, the working parameter group corresponding to the first wheel, and the working parameter group corresponding to the second wheel includes: All the aforementioned working parameters are classified into either a first type of parameter or a second type of parameter; Clustering is performed on the portion of each working parameter group that belongs to the first type of parameter, and at least one cluster center is obtained. A corresponding working condition type is determined based on each cluster center. For any of the measured tire pressure values, the measured tire pressure value is marked according to the working condition type corresponding to the working parameter group of the first wheel detected at the same sampling time, and the working parameter belonging to the second type parameter in the working parameter group of the first wheel. For any of the second wheels, the measured tire pressure values marked with the same working condition type are selected according to the working condition type corresponding to the working parameter group of the second wheel. The selected measured tire pressure values and the marked working parameters are fitted to obtain the tire pressure value-second type parameter fitting relationship. The tire pressure value-second type parameter fitting relationship and the working parameters of the second wheel belonging to the second type parameter are used to determine the calculated tire pressure value of the second wheel.
5. A computer device, characterized in that, It includes a memory and a processor, the memory being used to store at least one program, and the processor being used to load at least one program to execute the tire pressure detection method of claim 4.
6. A computer-readable storage medium storing a processor-executable program, characterized in that, The processor-executable program, when executed by the processor, is used to perform the tire pressure detection method of claim 4.
7. A vehicle, characterized in that, The vehicle includes the tire pressure monitoring system according to any one of claims 1-3.