Signal processing of vehicle wheels speed for the detection of tyre pressure reduction

摘要

An ABS microcomputer (16) counts the number of pulses (N) given between two counted times and executes a specific processing based on the data of pulse number (N) and pulse counting period ( DELTA t). The DWS microcomputer (21) receives the data of pulse number (N) and pulse counting period ( DELTA t) of the ABS microcomputer (16) through the communication line (17) to calculate the rotational angular velocities of the tires (W1, W2, W3, W4) based on the data of pulse nubmer (N) and pulse counting period ( DELTA t) so that the calculated rotational angular velocities of the four tires (W1, W2, W3, W4) are compared with one another to detect whether or not there is a tire reduced in air pressure. IMAGE