轮胎内置加速度传感器的汽车制动特性传感方法

汽车制动性能失灵会危及生命安全.为此,文中提出一种通过微电子机械系统(MEMS)电容加速度传感器来监测动态汽车制动性能的方案.将传感装置安装在汽车轮胎内部用以获取径向加速度信号,将制动时段的径向加速度信号通过无线通信方式向外部接收系统传送,作为后续变换处理和制动性能评估的依据.文中对加速度传感器信号的组成进行了理论推导,并阐述了传感器信号的采样、动态标注和存储、平滑去噪、斜率比较以及制动起始时刻判定等的处理方法.硬件实验结果验证了该轮胎内置传感方案的可行性.

Sensing Approach for Automobile Braking Performance Using Tire-Mounted Accelerometer

As the malfunction of automobile braking system is life threatening,a monitoring scheme of dynamic automobile braking performance using MEMS(Micro-Electro-Mechanical System) capacitive accelerometer is proposed.In this scheme,the accelerometer set is fixed in the tire to collect the radial acceleration,and the signals of radial acceleration in the braking period are sent to the outer receiving system by wireless communication.The signals are then used as a basis for the later transformation from radial acceleration to tire acceleration and for the eva-(luation) of braking performance.Moreover,the components of the radial acceleration are theoretically derived,and the processing methods such as the signal sampling,the dynamic marking and storing,the noise removing,the slope comparison and the onset detection of braking operation are described.The results of hardware experiments verify the feasibility of the tire-mounted accelerometer approach.