| 摘要 |
PROBLEM TO BE SOLVED: To lengthen the life of a control valve by lowering exciting frequency of brake force. SOLUTION: This brake pressure vibrating device is constituted of a brake force exciting part 19 which gives minute vibration to the brake force generated by a driver operating part 24; a detecting part 20 which detects vibration characteristics of a wheel speed at the time of a tire grip; and a brake force reducing part 21 which outputs a brake force reducing command based on the detected vibration characteristic. Then, the value of the exciting frequency of the brake force exciting part 19 is set at a frequency obtained by dividing a resonance frequency f1 by an integer (n) greater than 2. Since a higher harmonic of exciting vibration is generated in vibration components of the brake force, the vibration component of the resonance frequency f1 appears also in the vibration component of the wheel speed. In this connection, the brake force can be regulated not to exceed the slip-state of the peak-valueμ, based on the vibration component. In other words, the exciting frequency of the brake force can be lowered, thereby lengthening the life of a control valve.
|
