CN-121989598-A - Tire pressure sensor and vehicle

CN121989598ACN 121989598 ACN121989598 ACN 121989598ACN-121989598-A

Abstract

The invention discloses a tire pressure sensor and a vehicle. The tire pressure sensor is used for being mounted on a tire valve and comprises a sensor module, a piezoelectric power generation module and an electric energy conversion unit, wherein the sensor module is used for monitoring tire state information and comprises a battery, the piezoelectric power generation module is electrically connected with the sensor module and is used for supplying power to the sensor module, the piezoelectric power generation module comprises piezoelectric ceramics and an electric energy conversion unit, the piezoelectric ceramics is used for generating electric charges through vibration of a tire, the electric energy conversion unit is connected with the piezoelectric ceramics and the battery and is used for converting the electric charges generated by the piezoelectric ceramics into direct current and supplying the direct current to the battery of the sensor module. The invention can realize continuous self-charging, and can effectively ensure that the tire pressure sensor is in a better working state without being limited by the electric energy of the traditional energy storage lithium battery.

Inventors

MA TIANGANG

Assignees

欧摩威汽车安全系统(长春)有限公司

Dates

Publication Date: 20260508
Application Date: 20260330

Claims (15)

1. A tire pressure sensor for mounting to a tire valve, the tire pressure sensor comprising: A sensor module for monitoring tire condition information, the sensor module comprising a battery; the piezoelectric power generation module is electrically connected with the sensor module and is used for supplying power to the sensor module; Wherein, the piezoelectric power generation module includes: A piezoelectric ceramic for generating electric charges by vibration of the tire; And the electric energy conversion unit is connected with the piezoelectric ceramic and the battery, and is used for converting electric charges generated by the piezoelectric ceramic into direct current and supplying the direct current to the battery of the sensor module.
2. The tire pressure sensor of claim 1, wherein the piezoelectric power generation module is configured to be integrated into the tire valve, wherein a metal fixed rod within the tire valve is configured as an anode of the power conversion unit that is electrically connected to the sensor module, and wherein the piezoelectric power generation module further comprises a wire configured as a cathode of the power conversion unit that is electrically connected to the sensor module.
3. The tire pressure sensor of claim 1, wherein the piezoelectric power generation module further comprises: The piezoelectric ceramic and the electric energy conversion unit are arranged in the rubber shell, the outer surface of the rubber shell is used for being attached to the inner wall of the hub in the tire, and the rubber shell is used for being integrated with the tire valve through injection molding; The insulating rubber pad is arranged in the rubber shell and between the piezoelectric ceramic and the electric energy conversion unit.
4. The tire pressure sensor according to claim 3, wherein the electric energy conversion unit includes: the charge collection and conversion circuit PCB is arranged in the rubber shell and is electrically connected with the piezoelectric ceramics.
5. The tire pressure sensor of claim 4, wherein the electrical energy conversion unit further comprises: The rectification chip or the rectification diode group is arranged on the charge collection and conversion circuit PCB, and the input end of the rectification chip or the rectification diode group is electrically connected with the piezoelectric ceramic; The storage capacitor is arranged on the charge collection and conversion circuit PCB, one end of the storage capacitor is electrically connected with the output end of the rectifying chip or the rectifying diode group, and the other end of the storage capacitor is configured to supply power to the battery of the sensor module.
6. The tire pressure sensor of claim 1, wherein the sensor module further comprises: The tire pressure detection chip is electrically connected with the battery and is used for monitoring the pressure of the tire; The acceleration detection chip is electrically connected with the tire pressure detection chip and is used for monitoring the acceleration of the tire, and the acceleration detection chip is provided with a temperature detection unit for monitoring the temperature of the tire.
7. The tire pressure sensor of claim 6, wherein the tire condition information includes tire pressure, tire temperature, and tire acceleration.
8. The tire pressure sensor of claim 6, wherein the acceleration detection chip is configured to monitor acceleration of the tire in three directions X, Y, Z.
9. The tire pressure sensor according to claim 8, wherein the tire pressure detecting chip is configured to calculate and obtain the tire rotation speed information by a map model between a pre-calibrated wheel rotation speed and an acceleration signal value based on an acceleration signal converted from an axial centrifugal force generated by rotation of the tire obtained from the acceleration detecting chip.
10. A vehicle, characterized by comprising: A tire on which the tire pressure sensor according to any one of claims 1 to 9 is mounted; The vehicle body receiving unit is in signal connection with the tire pressure sensor and is used for receiving the tire state information sent by the sensor module; And the vehicle controller is in signal connection with the vehicle body receiving unit and is used for processing the tire state information.
11. The vehicle of claim 10, further comprising a wheel speed sensor, the vehicle controller configured to: Receiving tire rotation speed information which is calculated by the tire pressure detection chip and comes from the tire pressure sensor; And comparing and checking the tire rotation speed information with the signal of the wheel speed sensor in real time.
12. The vehicle of claim 11, wherein the vehicle controller is further configured to execute any one or more of the following control logic: When the wheel speed sensor is effective, based on a verification result obtained by comparing and verifying the tire rotation speed information with the signal of the wheel speed sensor, calibrating and compensating the tire rotation speed information or the signal of the wheel speed sensor; And when the wheel speed sensor fails, switching to the adoption of the tire rotation speed information of the tire pressure sensor for vehicle dynamic control.
13. The vehicle of claim 10, wherein the vehicle is further characterized by, the vehicle further includes a chassis adjustment system configured to: transmitting acceleration information of X, Y, Z directions which come from the tire pressure sensor and are monitored by an acceleration detection chip to the chassis adjusting system; the chassis adjustment system is for adjusting suspension of the tire based on the acceleration information.
14. The vehicle of claim 10, wherein the tire comprises: the tire pressure sensor comprises a wheel hub, a tire air tap, a piezoelectric power generation module of the tire pressure sensor, a rubber shell of the piezoelectric power generation module and the inner wall of the wheel hub.
15. The vehicle of claim 14, wherein the tire valve includes a metal stem, the positive electrode of the power conversion unit is configured as a metal stem within the tire valve and is electrically connected to the sensor module, and the negative electrode of the power conversion unit is configured as a wire and is electrically connected to the sensor module.

Description

Tire pressure sensor and vehicle Technical Field The invention relates to the technical field of automobile sensors, in particular to a tire pressure sensor and a vehicle. Background The tire pressure monitoring system (Tire Pressure Monitoring System, TPMS) is an important part for ensuring the running safety of the vehicle, can monitor the pressure and the temperature of the tire in real time, gives an alarm for abnormality of the pressure and the temperature of the tire, and reminds a user of maintaining reasonable tire pressure. Currently mainstream tire pressure monitoring systems include a tire pressure sensor mounted within a tire and a TPMS receiver located on a vehicle body. The tire pressure sensor is used for detecting the air pressure of the tire, and the TPMS receiver is used for receiving the sensor signals and transmitting the received data information to the instrument for display. Along with the improvement of intelligent demands of automobiles, part of advanced tire pressure sensors are integrated on a single chip, such as temperature and acceleration sensors, so as to increase monitoring functions such as temperature and acceleration, and enable the tire pressure sensors to acquire more dimensional data. However, since the existing tire pressure sensors all rely on a disposable, non-rechargeable, fixed capacity lithium battery for power, the power supply mode is single and the total energy is strictly limited, and in order to ensure that the tire pressure monitoring function of the core is continuously effective throughout the life cycle of the battery, the limitation has to be made. For example, the frequency of activation of the new functions is reduced or the new functions are turned off directly to prevent premature battery drain. This makes such advanced tire pressure sensors integrated with other sensors not fully valuable, effectively limiting the TPMS's potential in improving vehicle active safety and driving comfort, etc. If the current power supply mode of the tire pressure sensor can be improved to continuously supply power without being limited by energy supply, the tire pressure sensor can play full functions and roles. Meanwhile, the traditional lithium battery power supply mode has defects, after the electric quantity is exhausted, the whole sensor module is directly scrapped, and the battery needs to be replaced, so that the use cost of a user is increased, and the resource waste is caused. Therefore, a solution for fundamentally solving the continuous power supply problem of the tire pressure sensor is needed to break through the limitation of the limited battery energy to expand the functions and use of the tire pressure sensor. Disclosure of Invention The invention aims to solve the technical problem that the conventional tire pressure sensor is limited by the total electric quantity of a fixed-capacity lithium battery and cannot exert the effect of the conventional tire pressure sensor. The invention provides a tire pressure sensor and a vehicle, wherein the tire pressure sensor can realize continuous self-charging, and can effectively ensure that the tire pressure sensor is in a better working state and is not limited by the electric energy of a traditional energy storage lithium battery. To solve the above technical problems, embodiments of the present invention disclose a tire pressure sensor for mounting to a tire valve, the tire pressure sensor comprising: A sensor module for monitoring tire condition information, the sensor module comprising a battery; the piezoelectric power generation module is electrically connected with the sensor module and is used for supplying power to the sensor module; Wherein, the piezoelectric power generation module includes: A piezoelectric ceramic for generating electric charges by vibration of the tire; And the electric energy conversion unit is connected with the piezoelectric ceramic and the battery, and is used for converting electric charges generated by the piezoelectric ceramic into direct current and supplying the direct current to the battery of the sensor module. By adopting the technical scheme, the tire pressure sensor is additionally provided with the piezoelectric power generation module which is electrically connected with the sensor module, and the piezoelectric power generation module is extruded or impacted by utilizing the impact force of the tire and the road surface and other fluctuation of the tire when the tire is driven, so that the sensor module is continuously powered, the power supply mode of the tire pressure sensor is changed from a lithium battery depending on fixed capacity to charging by utilizing the normal impact force in the driving process of the tire, and the self-charging of the tire pressure sensor is effectively realized. Specifically, the piezoelectric power generation module comprises piezoelectric ceramics and an electric energy conversion unit, wherein the piezoelectric ceramics can genera