| 摘要 |
<p>A method of detecting a partially deflated tyre on a vehicle having four tyres each mounted on a wheel (1,2,3,4) provided at each wheel with a signal generator producing a series of digital signals or pulses (1 min ,2 min ,3 min ,4) spaced apart by equal increments of angular rotation of the respective tyre and wheel assembly characterised by calculating from one of the series of signals the vehicle speed, selecting an appropriate interval for deflation detection, measuring for each of the four wheels a speed of rotation signal for said interval, storing the speeds found, repeating the measuring for at least three consecutive successive equal chosen intervals, averaging the speeds to produce an average speed signal for each wheel, processing the four signals in a processing unit (8) which subtracts the sum of the signals from one pair of diagonally opposite wheels from the sum of the signals from the other pair of diagonally opposite wheels, sensing when the magnitude of the result is between 0.05% and 0.6% of the mean of the two sums and when it is, operating a warning device to indicate a tyre is partially or completely deflated. <IMAGE></p> |
