【摘要】 为推广频率法胎压监测系统实际使用，研究了车辆速度和载荷变化对振动频率的影响。以频率法胎压监测原理为基础，设计轮速传感器信号采集电路；对轮速信号异常点和轮齿误差进行修正。通过Fourier变换和模型参数估计2种方法，在40～100 km/h速度区间，在空载（仅前排2人）、半载（4人）、满载（4人加后备箱50 kg）3种载荷状态下，计算了扭转振动频率。进行了试验测试。统计测试结果表明：自由驾驶状态4轮缺气报警时间为6～8 min，速度补偿前报警时间为12～15 min；不同载荷无误报。该方法解决了报警时间过长和误报问题，提高了胎压监测系统性能。更多还原

【Abstract】 This paper investigated the influence of vehicle speed and load changes on vibration frequency to popularize the practical application of the tire-pressure monitoring-system with a frequency method. A signalacquisition circuit of wheel-speed sensors was designed based on the tire-pressure monitoring principle with the frequency method. The wheel-speed signal abnormal points and the gear-tooth errors were corrected. The torsional vibration frequency was calculated by the Fourier transform and by the model parameter estimation, in the speed of 40～100 km/h, under three load states including no-load(2 people in front row), half-load(4 people),and full-load(4 people plus 50 kg in trunk). The experimental tests were carried out. The statistical test results showed that the four-wheel lack of air alarm time in the free driving state was 6～8 min, and the alarm time before speed compensation was 12～15 min; there were no false alarms for different loads. The problem of too long alarm time and false alarm is solved. Therefore, this method improves the performances of tire-pressure monitoring-system.更多还原