| 摘要 |
PURPOSE:To decrease a consumption of working fluid by calculating the supply and the discharge of the working fluid based on a combined signal which is composed of a vertical acceleration signal from which high frequency component is decreased and a signal in which only a vertical acceleration above a certain value is picked up, a vertical relative displacement velocity signal and a vertical relative displacement signal. CONSTITUTION:An air suspension unit 1 is installed between a car body side element 2 and a wheel side element 3 and has an auxiliary damper 1a. In this case, a controller 6 makes a combined signal which is composed of a signal in which high frequency component is decreased and a signal only a vertical acceleration signal above a certain value is picked up from a vertical acceleration signal of the car body side element 2 which is detected by a sensor 5. A controlled variable of the working fluid is calculated from a vertical relative displacement velocity signal and a vertical relative displacement signal between the car body side element 2 and the wheel side element 3, which are detected by sensor 4, and the said combined signal. A control value 7 is controlled depending on the calculated result and the working fluid is supplied into and discharged from the auxiliary damper 1a from a high pressure tank 8 and to a low pressure tank 9. |
