压电式胎压报警器供电装置的发电特性

Power performance of a piezoelectric generator for tire pressure monitoring sensor

提出利用压电发电装置替代电池为胎压报警器提供实时电能。根据胎压报警器结构特点,提出将压电发电装置安装在车轮轮毂上,利用车轮转动中的振动来发电的方案。通过试验的方法研究了压电振子在轮毂上不同安装方式下的发电特性。试验结果表明,在既垂直于轮毂又垂直于车轮滚动方向的安装方式下,压电振子可以有效克服离心力的影响并吸收来自车轮所在平面多个方向的振动,压电发电装置发电效果较佳,适合为胎压报警器供电。利用4片45mm×15mm×0.2mm的悬臂梁型压电振子并联为胎压报警器供电,其产生的能量能够满足胎压报警器的工作要求。

A piezoelectric power generator was proposed to supply real-time electric energy to the tire pressure monitoring sensor（TPMS）. According to the structural feature of TPMS, a scheme was suggested in which the generator is fixed to the wheel hub and generates the electric energy using the vibration energy during the wheel rotation. The power performance of the generator under different installations of the cantilever beam piezoelectric vibrator was investigated experimentally. The results show that the installation of vibrator vertical to the wheel hub as well as to the wheel rolling direction is the best, it can avoid the impact of the centrifugal force, make use of the energy of the multidirectional vibrations in the plane of wheel. Thus installed generator with 4×45 mm×15 mm×0.2 mm cantilever beam piezoelectric vibrators connected in parallel can satisfy the power demand by TPMS.