CN112776541A - Tire pressure monitoring system and method - Google Patents
Tire pressure monitoring system and method Download PDFInfo
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- CN112776541A CN112776541A CN202110018666.XA CN202110018666A CN112776541A CN 112776541 A CN112776541 A CN 112776541A CN 202110018666 A CN202110018666 A CN 202110018666A CN 112776541 A CN112776541 A CN 112776541A
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- tire pressure
- pressure monitoring
- tire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
- B60C23/0433—Radio signals
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Abstract
The invention provides a tire pressure monitoring system and a method, which relate to the technical field of automobile tire pressure monitoring, and comprise a tire pressure monitoring assembly and a central processing unit, wherein the tire pressure monitoring assembly is provided with a plurality of working modes to monitor the tire pressure data of vehicle tires in real time, when the central processing unit in different working modes receives the tire pressure data, the tire pressure data is processed, and a tire pressure alarm flag bit and a tire temperature alarm flag bit are set based on the processed tire pressure data to remind whether the tire pressure and the tire temperature are normal or not. The invention solves the problem that the traditional tire pressure monitoring system has overlarge power consumption and can not effectively detect the tire pressure state of the vehicle tire after flameout, and a user can remotely check the tire pressure information directly through a mobile phone, so that the experience is better, and the driving safety protection and navigation can be realized.
Description
Technical Field
The invention relates to the technical field of automobile tire pressure monitoring, in particular to a tire pressure monitoring system and method.
Background
At present, a tire pressure monitoring system is configured in the field of automobiles, main components of the tire pressure monitoring system are a tire pressure monitoring sensor and a tire pressure controller, and the tire pressure monitoring system takes pressure, temperature and tire acceleration as input variables and finally outputs pressure and temperature information by switching tire pressure monitoring modes. And no matter direct tire pressure monitoring or indirect tire pressure monitoring, real-time feedback in the starting process of the automobile can be achieved. However, the current tire pressure monitoring system cannot read the tire pressure and temperature information after the vehicle is shut down, and a user cannot know the vehicle state in time, so that the user experience is not facilitated.
Therefore, there is a need to develop a tire pressure monitoring system and method.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a tire pressure monitoring system and a method thereof, which are used to solve the problems that the conventional tire pressure monitoring system consumes too much power and cannot effectively detect the tire pressure status of the vehicle tire after being turned off.
In a first aspect, the present invention provides a tire pressure monitoring method, which employs a tire pressure monitoring system, the tire pressure monitoring system includes a central processing unit and a plurality of tire pressure monitoring assemblies, each tire pressure monitoring assembly establishes a communication connection with the central processing unit, and the tire pressure monitoring method includes the following steps:
step S1, initializing a central processing unit and each tire pressure monitoring assembly, and simultaneously setting a tire pressure alarm threshold value and a tire pressure change threshold value of the central processing unit;
step S2, acquiring tire pressure data of the current vehicle tire through the tire pressure monitoring assembly, wherein the tire pressure data comprises a tire pressure value, a tire temperature value and an acceleration value, and the tire pressure monitoring assembly enters a static working mode or a dynamic working mode according to different numerical ranges of the tire pressure data;
step S3, after receiving the tire pressure data, the central processing unit in different working modes processes the tire pressure data, and sets a tire pressure alarm flag bit and a tire temperature alarm flag bit based on the processed tire pressure data, for reminding whether the tire pressure and the tire temperature are normal;
and step S4, judging whether a CAN bus between the central processing unit and the tire pressure monitoring assembly is in a dormant state, if the CAN bus is not in the dormant state, sending the processed tire pressure data to one or more ECUs (electronic control units) in the instrument, the vehicle machine and the T-BOX through the CAN bus, and if the CAN bus is in the dormant state, waiting for the next power-on of the vehicle, sending the stored data stored in the central processing unit to the respective ECUs in the instrument, the vehicle machine and the T-BOX through the CAN bus until the end.
Further, in the step S2, in the static operation mode,
when the tire pressure monitoring assembly detects that the tire pressure value is within a preset normal tire pressure value range, the tire pressure monitoring assembly is in a dormant state,
when the tire pressure monitoring assembly detects that the tire pressure change value exceeds the tire pressure change threshold value, the monitoring and sending frequency of the tire pressure monitoring assembly is improved until the tire pressure change value in the continuous preset monitoring times does not reach the tire pressure change threshold value and is within the preset normal tire pressure numerical range, and the tire pressure monitoring assembly enters the dormant state again.
Further, in step S2, in the dynamic operation mode:
when the tire pressure monitoring assembly sends the tire pressure data frames to the central processing unit in a fixed period, if the tire pressure change value is detected to exceed the tire pressure change threshold value or the tire pressure value exceeds the tire pressure alarm threshold value, the monitoring and sending frequency of the tire pressure monitoring assembly is improved until the tire pressure change value in the continuous preset monitoring times does not reach the tire pressure change threshold value and is within the preset normal tire pressure value range, and the tire pressure monitoring assembly returns to send the tire pressure data frames to the central processing unit in the fixed period.
In a second aspect, the present invention further provides a tire pressure monitoring system, including a tire pressure monitoring assembly and a central processing unit, the tire pressure monitoring assembly is disposed at the end of each tire valve, the central processing unit is disposed in a vehicle, the tire pressure monitoring assembly communicates with the central processing unit via radio frequency, the central processing unit includes a control module, a storage module, a CAN transceiver module and a radio frequency receiving module, wherein the control module is configured to process tire pressure data transmitted from the tire pressure monitoring assembly to the central processing unit and transmit the processed tire pressure data to the storage module and the CAN transceiver module, the storage module is configured to store tire pressure data transmitted from the tire pressure monitoring assembly to the central processing unit, the CAN transceiver module transmits the collected tire pressure data to an instrument, a vehicle machine and a T-BOX on the vehicle via a CAN bus network, the radio frequency receiving module is used for receiving radio frequency data sent by the tire pressure monitoring assembly and modulating the radio frequency data into identifiable digital signals;
the central processor is programmed to perform the steps of the tire pressure monitoring method.
Furthermore, the central processing unit further comprises a power module and a driving module, wherein the power module is used for providing power for the normal operation of the whole central processing unit, and the driving module is used for driving the radio frequency receiving module to work.
Further, the tire pressure monitoring assembly comprises a radio frequency transmitting module, a low-frequency antenna, a sensor module and an electronic control unit, wherein the electronic control module receives instructions through the low-frequency antenna and controls the radio frequency transmitting module to feed back preset information, and the sensor module transmits tire pressure data to the electronic control module through the radio frequency transmitting module.
The invention brings the following beneficial effects:
according to the tire pressure monitoring system and method, the multiple working modes are arranged on the tire pressure monitoring assembly, so that the power consumption is greatly saved, and the requirement of vehicle specification power consumption design is met. Meanwhile, the tire pressure information of the whole vehicle can be monitored after flameout, and the user can directly check the tire pressure information remotely through the mobile phone, so that the experience is better, and the driving safety protection and navigation can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a tire pressure monitoring system according to the present embodiment;
fig. 2 is a flowchart of a tire pressure monitoring method according to an embodiment;
in the figure:
u2-tire pressure monitoring assembly, U1-central processing unit;
101-power module, 102-drive module, 103-control module, 104-storage module, 105-CAN transceiving module, 106-radio frequency receiving module;
201-radio frequency transmission module, 202-low frequency antenna, 203-sensor module, 204-electronic control module.
Detailed Description
As shown in fig. 1, the tire pressure monitoring system comprises a tire pressure monitoring assembly U2 and a central processor U1, wherein the tire pressure monitoring assembly U2 is mounted at the tail ends of four tire valves, is fixed on a wheel rim, independently supplies power, and communicates with the central processor U1 through radio frequency. The central processor U1 includes a power module 101, a driving module 102, a control module 103, a storage module 104, a CAN transceiver module 105, and a radio frequency receiving module 106, wherein the power module 101 is used for providing power for normal operation of the whole central processor U1, the driving module 102 drives the radio frequency receiving module 106 to operate, so that the radio frequency receiving module 106 CAN receive radio frequency data in the tire pressure monitoring assembly U2 and modulate the radio frequency data into recognizable digital signals, and meanwhile, the ability of resisting EMC and co-frequency interference is improved by using modulated waves and multi-frequency communication. The rf receiving module 106 has a sleep mode and a wake mode. In the sleep mode, every 20ms period, the rf receiving module 106 keeps turning on the 5ms rf receiving channel, i.e. window scanning, and when the awake data frame conforming to the rf frame definition is continuously received within the window scanning period of 5ms, the rf receiving module 106 switches from the sleep mode to the awake mode, and the rf receiving channel is continuously turned on in this state to receive the tire pressure rf data in real time.
The control module 103 is responsible for processing and analyzing the tire pressure data transmitted from the tire pressure monitoring assembly U2 to the central processor U1, then sets a tire pressure alarm identification bit and a tire temperature alarm identification bit according to the extracted tire pressure value and tire temperature value, and distributes the processed tire pressure data to the storage module 104 and the CAN transceiver module 105, and also CAN give consideration to logic processing and calculation functions. The storage module 104 is responsible for storing the received tire pressure value, tire temperature value, tire pressure alarm threshold value, tire temperature alarm threshold value, tire pressure alarm identification bit and tire temperature alarm identification bit. The CAN transceiver module 105 is responsible for transmitting data such as tire pressure, tire temperature and the like to instruments, a vehicle machine and a T-BOX on a vehicle through a CAN bus network, and the radio frequency receiver module 106 is used for receiving radio frequency data in the tire pressure monitoring assembly U2 and modulating the radio frequency data into identifiable digital signals.
In this embodiment, the tire pressure monitoring assembly U2 includes a radio frequency transmitting module 201, a low frequency antenna 202, a sensor module 203, and an electronic control module 204, when it is necessary to diagnose or confirm operations related to tire pressure information, a diagnosis device often transmits a low frequency command of 125khz through the low frequency antenna, and the electronic control module 204 receives an instruction through the low frequency antenna 202 and controls the radio frequency transmitting module 201 to feed back preset information. The radio frequency transmitting module 201 is responsible for receiving the instruction of the electronic control module 204, and transmits the relevant information of the tire pressure data to the central processing unit U1 for processing and analysis after the relevant information is FSK modulated.
In this embodiment, an electronic control module built in the tire pressure monitoring assembly is used as a brain center thereof, and a method for monitoring tire pressure is shown in fig. 2, and includes the following steps:
step S1, initializing a central processing unit and a plurality of tire pressure monitoring assemblies, and simultaneously setting a tire pressure alarm threshold value and a tire pressure change threshold value of the central processing unit;
step S2, acquiring the tire pressure data of the current vehicle tire through the tire pressure monitoring assembly, wherein the tire pressure data comprises a tire pressure value, a tire temperature value and an acceleration value, and the tire pressure monitoring assembly enters a static working mode or a dynamic working mode according to the difference of the numerical range of the tire pressure data.
It should be noted that in the static operating mode, when the tire pressure monitoring assembly detects that the tire pressure value is within the preset normal tire pressure value range, the tire pressure monitoring assembly enters the dormant state. Or when the tire pressure monitoring assembly detects that the tire pressure change value exceeds the tire pressure change threshold value, the monitoring and sending frequency of the tire pressure monitoring assembly is improved until the tire pressure change value in the continuous preset monitoring times does not reach the tire pressure change threshold value and is within the preset normal tire pressure value range, and the tire pressure monitoring assembly enters the dormant state again. The dynamic working mode is that when the tire pressure monitoring assembly is in the process of sending a tire pressure data frame to the central processing unit in a fixed period, if the tire pressure change value is detected to exceed the tire pressure change threshold value or the tire pressure value exceeds the tire pressure alarm threshold value, the monitoring and sending frequency of the tire pressure monitoring assembly is improved until the tire pressure change value in the continuous preset monitoring times does not reach the tire pressure change threshold value and is within the preset normal tire pressure value range, and the tire pressure monitoring assembly returns to the fixed period to send the tire pressure data frame to the central processing unit.
Step S3, after receiving the tire pressure data, the central processing unit in different working modes processes the tire pressure data, and sets a tire pressure alarm flag bit and a tire temperature alarm flag bit based on the processed tire pressure data, for reminding whether the tire pressure and the tire temperature are normal;
and step S4, judging whether a CAN bus between the central processing unit and the tire pressure monitoring assembly is in a dormant state, if the CAN bus is not in the dormant state, sending the processed tire pressure data to one or more ECUs (electronic control units) in the instrument, the vehicle machine and the T-BOX through the CAN bus, and if the CAN bus is in the dormant state, waiting for the next power-on of the vehicle, sending the stored data stored in the central processing unit to the respective ECUs in the instrument, the vehicle machine and the T-BOX through the CAN bus until the end.
In the process of actually monitoring the tire pressure, the sleep state only exists in the period from the product being off-line to being activated, only other sensors and the low-frequency antenna in the sensor module are in the low power consumption state in the period, other modules do not work, and when the change of the air pressure is detected to exceed the threshold value, the electronic control module exits the sleep mode and enters the corresponding working mode according to the detected value of the acceleration. In a static working mode, the low-frequency antenna and sensor module is always in a periodic working state, when the fact that the tire temperature is too high or the change value of the tire pressure exceeds the tire pressure change threshold value of 8.25kpa within a certain time is detected, the radio frequency transmitting module is controlled to transmit three frames of tire pressure and tire temperature data detected at the moment, wherein the transmitted first frame is the radio frequency data with a front header awakening data frame for awakening the radio frequency receiving module in the dormant mode, and after the centripetal acceleration of the tire is larger than the preset acceleration threshold value of 6G, the electronic control module enters a dynamic working mode. And in the dynamic working mode, the radio frequency transmitting module transmits the tire pressure and tire temperature data to the radio frequency receiving module periodically, and when the centripetal acceleration lasts for 10min and is less than a preset acceleration threshold value 6G, the electronic control module returns to the static working mode.
The tire pressure monitoring system and the tire pressure monitoring method can monitor the tire pressure information of the whole vehicle after flameout, and a user can remotely check the tire pressure information directly through a mobile phone, so that the tire pressure monitoring system and the tire pressure monitoring method are better in experience and can protect driving for driving safety. Meanwhile, the tire pressure can be monitored through multiple working modes on the premise that all working conditions can monitor the tire pressure data, so that the power consumption is greatly saved, and the requirement of vehicle gauge power consumption design can be met.
Claims (6)
1. A tire pressure monitoring method adopts a tire pressure monitoring system, the tire pressure monitoring system comprises a central processing unit and a plurality of tire pressure monitoring assemblies, and each tire pressure monitoring assembly is respectively in communication connection with the central processing unit, and the tire pressure monitoring method is characterized by comprising the following steps:
step S1, initializing a central processing unit and each tire pressure monitoring assembly, and simultaneously setting a tire pressure alarm threshold value and a tire pressure change threshold value of the central processing unit;
step S2, acquiring tire pressure data of the current vehicle tire through the tire pressure monitoring assembly, wherein the tire pressure data comprises a tire pressure value, a tire temperature value and an acceleration value, and the tire pressure monitoring assembly enters a static working mode or a dynamic working mode according to different numerical ranges of the tire pressure data;
step S3, after receiving the tire pressure data, the central processing unit in different working modes processes the tire pressure data, and sets a tire pressure alarm flag bit and a tire temperature alarm flag bit based on the processed tire pressure data, for reminding whether the tire pressure and the tire temperature are normal;
and step S4, judging whether a CAN bus between the central processing unit and the tire pressure monitoring assembly is in a dormant state, if the CAN bus is not in the dormant state, sending the processed tire pressure data to one or more ECUs (electronic control units) in the instrument, the vehicle machine and the T-BOX through the CAN bus, and if the CAN bus is in the dormant state, waiting for the next power-on of the vehicle, sending the stored data stored in the central processing unit to the respective ECUs in the instrument, the vehicle machine and the T-BOX through the CAN bus until the end.
2. The tire pressure monitoring method according to claim 1, wherein in step S2, in a static operation mode,
when the tire pressure monitoring assembly detects that the tire pressure value is within a preset normal tire pressure value range, the tire pressure monitoring assembly is in a dormant state,
when the tire pressure monitoring assembly detects that the tire pressure change value exceeds the tire pressure change threshold value, the monitoring and sending frequency of the tire pressure monitoring assembly is improved until the tire pressure change value in the continuous preset monitoring times does not reach the tire pressure change threshold value and is within the preset normal tire pressure numerical range, and the tire pressure monitoring assembly enters the dormant state again.
3. The tire pressure monitoring method according to claim 1, wherein in the step S2, in the dynamic operation mode:
when the tire pressure monitoring assembly sends the tire pressure data frames to the central processing unit in a fixed period, if the tire pressure change value is detected to exceed the tire pressure change threshold value or the tire pressure value exceeds the tire pressure alarm threshold value, the monitoring and sending frequency of the tire pressure monitoring assembly is improved until the tire pressure change value in the continuous preset monitoring times does not reach the tire pressure change threshold value and is within the preset normal tire pressure value range, and the tire pressure monitoring assembly returns to send the tire pressure data frames to the central processing unit in the fixed period.
4. A tire pressure monitoring system, including a tire pressure monitoring assembly (U2) and a central processing unit (U1) installed in a vehicle, the tire pressure monitoring assembly (U2) communicating with the central processing unit (U1) through wireless radio frequency, the central processing unit (U1) includes a control module (103), a storage module (104), a CAN transceiver module (105) and a radio frequency receiving module (106), wherein, the control module (103) is used for processing the tire pressure data transmitted from the tire pressure monitoring assembly (U2) to the central processing unit (U1) and transmitting the processed tire pressure data to the storage module (104) and the CAN transceiver module (105), the storage module (105) is used for storing the tire pressure data transmitted from the tire pressure monitoring assembly (U2) to the central processing unit, the CAN transceiving module (105) is used for transmitting the collected tire pressure data to instruments, a vehicle machine and a T-BOX on a vehicle through a CAN bus network, and the radio frequency receiving module (106) is used for receiving the radio frequency data transmitted by the tire pressure monitoring assembly (U2) and modulating the radio frequency data into identifiable digital signals;
the central processor (U1) is programmed so as to perform the steps of the tire pressure monitoring method according to any one of claims 1 to 3.
5. The tire pressure monitoring system according to claim 4, wherein the central processor (U1) further comprises a power supply module (101) and a driving module (102), wherein the power supply module (101) is used for supplying power for the normal operation of the whole central processor, and the driving module (102) is used for driving the radio frequency receiving module to work.
6. Tire air pressure monitoring system according to claim 5, wherein the tire air pressure monitoring assembly (U2) comprises a radio frequency transmitting module (201), a low frequency antenna (202), a sensor module (203), and an electronic control unit (204), wherein the electronic control module (204) receives commands through the low frequency antenna (202) and controls the radio frequency transmitting module (201) to feed back preset information, and the sensor module (203) transmits tire air pressure data to the electronic control module (204) through the radio frequency transmitting module (201).
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CN113212077A (en) * | 2021-06-15 | 2021-08-06 | 深圳市元征未来汽车技术有限公司 | Vehicle tire parameter monitoring method and system |
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CN114537054A (en) * | 2022-02-28 | 2022-05-27 | 重庆长安汽车股份有限公司 | Automatic tire positioning system for automobile tire pressure monitoring |
CN114559776A (en) * | 2022-04-01 | 2022-05-31 | 成都肯保捷芯辰传感器有限公司 | Non-motor vehicle tire pressure monitoring system and monitoring method |
TWI799114B (en) * | 2022-01-27 | 2023-04-11 | 系統電子工業股份有限公司 | Tire pressure detection device with dynamic energy-saving mechanism and energy-saving method |
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CN114559776B (en) * | 2022-04-01 | 2024-04-16 | 成都肯保捷芯辰传感器有限公司 | Non-motor vehicle tire pressure monitoring system and monitoring method |
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