The invention discloses a resonance frequency adjustable piezoelectric sensor and system for automobile tire pressure monitoring, the device comprises a piezoelectric cantilever beam main body, one end of the piezoelectric cantilever beam main body is connected with a rim, and the other end of the piezoelectric cantilever beam main body extends along the radial direction of the rim towards a position far away from the circle center of the rim and is located in a tire; the piezoelectric cantilever beam body comprises a tail end fixing device arranged on the rim, a rectangular cantilever beam elastic substrate installed on the tail end fixing device, a piezoelectric film arranged on the bottom face of the rectangular cantilever beam elastic substrate and two tail end mass blocks arranged at the free end of the cantilever beam elastic substrate. The piezoelectric film deforms along with the piezoelectric cantilever beam, charges are generated due to the piezoelectric effect, the magnitude of the charges is related to the magnitude of deformation related to the vibration frequency of the system, and the relationship between the voltage and the air damping is constructed by researching the relationship curve of the magnitude of the voltage and the rotating speed of the system; and the air pressure monitoring of the closed rotating environment is realized.
本发明公开了一种用于汽车胎压监测的可调共振频的压电传感器及系统,本装置包括压电悬臂梁主体,其中压电悬臂梁主体一端与车辋连接,另一端沿着车辋径向方向、向着远离车辋圆心处延伸,并位于轮胎内;所述压电悬臂梁主体包括设于所述车辋上的末端固定装置,安装在末端固定装置上的矩形悬臂梁弹性基板,设于所述矩形悬臂梁弹性基板底面上的压电薄膜,以及设置在悬臂梁弹性基板自由端的两末端质量块;本发明中的压电薄膜伴随压电悬臂梁产生形变,因压电效应产生电荷,电荷大小与其系统振动频率关联的形变大小所相关,通过研究系统电压大小和转速的关系曲线构建电压与空气阻尼之间的关系;实现对封闭旋转环境的气压监测。
Resonance-frequency-adjustable piezoelectric sensor and system for monitoring automobile tire pressure
一种用于汽车胎压监测的可调共振频的压电传感器及系统
2023-12-19
Patent
Elektronische Ressource
Chinesisch
IPC: | B60C VEHICLE TYRES , Fahrzeugreifen |
Tire pressure detection circuit, sensor, tire pressure monitoring system and automobile
Europäisches Patentamt | 2021
|Europäisches Patentamt | 2023
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