| 摘要 |
PROBLEM TO BE SOLVED: To surely suppress brake noise and judder by exciting brake hydraulic pressure at values except characteristic values of a car body and a steering when a frequency of brake hydraulic pressure fluctuation is going to coincide with the specific values of the car body and the steering or is going to be half. SOLUTION: A hydraulic oscillating device 7 is provided with a cylinder- shaped main body 7a, a piston 7b, a piezoelectric element 7c and a hydraulic chamber 7e communicated with a wheel cylinder 6. The piston 7b is operated by the piezoelectric element 7c by a signal from an electronic control device, brake hydraulic pressure is forcedly excited by values except characteristic values of a car body and a steering and generation of abnormal vibration is suppressed. Wheel speed when a frequency of brake hydraulic pressure fluctuation is going to be the characteristic values of the car body and the steering or is going to be half is preliminarily determined, the piston 7b is vibrated by operating the piezoelectric element 7c and vibration generated in a disc rotor is suppressed. As a result, brake noise and judder can be surely suppressed. |
