Abstract:

As the malfunction of automobile braking system is life threatening , a monitoring scheme of dynamic automobilebraking 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 ofradial acceleration in the braking period are sent to the outer receiving system by wireless communication. The signalsare then used as a basis for the later transformation from radial acceleration to tire acceleration and for the evaluationof braking performance. Moreover , the components of the radial acceleration are theoretically derived , andthe processing methods such as the signal sampling , the dynamic marking and storing , the noise removing , theslope comparison and the onset detection of braking operation are described. The results of hardware experimentsverify the feasibility of the tire-mounted accelerometer approach.

Key words: automobile, tire, accelerometer, braking, monitoring