| 摘要 |
<p>PURPOSE:To optimize the brake oil pressure reduction control timing even if the ground speed is detected smaller than the actual one by providing a speed amending circuit which outputs a signal amended as an average deceleration and using the output signal in a calculation of the slip occurence ratio. CONSTITUTION:A speed amending circuit 7 comprises a selecting circuit 5 and a deceleration determining circuit 6. The selecting circuit 5 receives the ground speed signal V sent out of a Doppler ground speed sensor 1 and the wheel speed signal Vw sent out of a wheel speed sensor 2 and selects the larger of them. The output of the selecting circuit 5 on the base of the selection is sent into the deceleration determining circuit 6, which outputs a signal which is to be reduced at a predetermined ratio. A comparator 3, regarding this output as a Doppler ground speed sensor output, performs a detection of a slip occurence ratio on the base of the output. Thus, if the higher speed is selected and a speed signal limited in the deceleration is used as a modified ground speed signal, a control signal can be output which decreases the brake oil pressure at the higher portion as indicated by a curved line M in the drawing.</p> |
