| 摘要 |
PCT No. PCT/JP97/01381 Sec. 371 Date Oct. 20, 1998 Sec. 102(e) Date Oct. 20, 1998 PCT Filed Apr. 22, 1997 PCT Pub. No. WO97/39926 PCT Pub. Date Oct. 30, 1997A brake assist control for generating a brake force greater than that of a normal time is performed. It is determined (102) that a brake pedal is operated at a high speed when a rate of change DELTA PM/C of a master cylinder pressure PM/C exceeds a first threshold value alpha . When the cause of the braking operation is an external disturbance, the rate of change DELTA PM/C the rate of change DELTA PM/C changes immediately thereafter. When a period during which the rate of change DELTA PM/C becomes less than a second threshold value beta is shorter than a predetermined period T0, it is determined that the cause of the braking operation is the external disturbance such as a rough road or a step and an execution of the brake assist control is prohibited (104, 108, 110, 112).
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