| 摘要 |
PURPOSE:To restrict a vibration at sudden acceleration and speed reduction and constrain vibration transmission at normal running by constituting the system wherein a change level of acceleration and speed reduction for a vehicle is detected and the spring constant and the attenuation force of a mount are made larger when said level is higher than a predetermined value. CONSTITUTION:When the negative pressure value 'P' of an engine air intake pipe has been inputted from a negative pressure sensor 54 to a controller 48, this controller 48 calculates a negative pressure change rate and makes judgement about a sudden acceleration and speed reduction condition from the absolute value of the change rate and a predetermined value (a). Namely, when said absolute value is larger than the predetermined value (a), the controller 48 makes an electromagnetic valve 34 non-excited and closes said valve, thereby making the fluid chamber 24 of each mount 12 independent and another electromagnetic valve 44 non-excited. Furthermore, the function of a pneumatic actuator 36 is stopped, the restriction of an elastic film 22 is released and the spring constant and the attenuation force of the mount 12 are enlarged. Consequently, a power unit 14 can be restricted in respect of a low frequency and large amplitude vibration. |
