| 摘要 |
PROBLEM TO BE SOLVED: To reduce vertical vibration of a vehicle body by providing a hydraulic actuator and a spring between the vehicle body and an axle and sense external turbulence in advance and to carry out control to cancel such external turbulence. SOLUTION: A hydraulic actuator 5 and a damper spring 6 connected in series are independently provided for each wheel of a vehicle body 1 and are located between a spring 2 and a damper 3 in parallel. Movement below the spring and above the spring is measured by means of a detection device 9 below the spring and detection device 12 above the spring. The results calculated by means of a computing unit 10 to generate a damping signal. The generated signal is then power-amplified by means of a servo amplifier 11, drives servo valve 7, and actuates the hydraulic actuator 5. By providing this set of hydraulic actuator and the damper spring for each of the four wheels, surface irregularities of the road are measured by means of the detection devices located on the wheel axles and the damping force is then calculated based on the measured values and spring constant and damping constant of the vehicle obtained beforehand. The obtained input value is then applied to the hydraulic actuator 5 to cancel the vibration component.
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