| 摘要 |
PURPOSE:To prevent violent influx of compressed air etc. from a sub-tank into a chamber, likely to occur when a suspension is changed over from hard to soft, by duty controlling a cut valve with a controller, and thereby opening the communication line by and by. CONSTITUTION:Through a communication line, a sub-tank 4 is installed at a chamber 2 of a suspension 1 whereto a high pressure fluid is supplied, and a cut valve 5 is arranged on the communication line 3. The chamber 2 and sub-tank 4 are put in communication, for ex., by opening this cut valve 5, to lead to drop of the spring constant of suspension 1. If, in this arrangement, the pressure in the sub-tank 4 is higher than in the chamber 2 when the suspension 1 is changed over from hard to soft, a controller 14 performs duty control of the cut valve 5, and the communication line 3 is opened gradually. This prevents violent influx of compressed air etc. from the sub-tank 4 into the chamber 2. |
