Working fluid circuit for active suspension system with surge suppressive feature
First Claim
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1. An actively controlled suspension system comprising:
- a hydraulic cylinder disposed between a vehicle body and a suspension member rotatably supporting a vehicular wheel, said hydraulic cylinder defining therein a working chambera pressure source means including a pump means associated with an automotive internal combustion engine to be driven by the output of said enginea pressure control valve means having a first port connected to said working chamber, a second port connected to said pressure source means via a supply line and a third port connected to said pressure source means via a drain line, said pressure control valve means being variable of valve position for selectively establishing and blocking fluid communication between said first port and said second port and between said first port and said third port for adjusting fluid pressure in said working chamber for controlling suspension characteristicsa back pressure absorbing means, associated with said drain line, for absorbing back pressure in said drain line, said back pressure absorbing means containing a pressure medium having a predetermined first pressure anda drain pressure maintaining means, associated with a drain line and active on said drain line at an orientation downstream of said back pressure absorbing means for maintaining fluid pressure in the drain line upstream thereof at a predetermined second pressure higher than said first pressure.
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Abstract
An active suspension system is provided a pressure accumulator connected to a drain line connecting a drain port of a pressure control valve which controls pressure in the working chamber of an active cylinder. The pressure accumulator serves for absorbing high pressure surge. On the other hand, means, disposed within the drain line, for generating pressure difference between the upstream and the lowerstream thereof so that the fluid pressure in the drain line at the orientation where the pressure accumulator is connected, is maintained at a level higher than an initial gas pressure in the pressure accumulator.
37 Citations
10 Claims
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1. An actively controlled suspension system comprising:
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a hydraulic cylinder disposed between a vehicle body and a suspension member rotatably supporting a vehicular wheel, said hydraulic cylinder defining therein a working chamber a pressure source means including a pump means associated with an automotive internal combustion engine to be driven by the output of said engine a pressure control valve means having a first port connected to said working chamber, a second port connected to said pressure source means via a supply line and a third port connected to said pressure source means via a drain line, said pressure control valve means being variable of valve position for selectively establishing and blocking fluid communication between said first port and said second port and between said first port and said third port for adjusting fluid pressure in said working chamber for controlling suspension characteristics a back pressure absorbing means, associated with said drain line, for absorbing back pressure in said drain line, said back pressure absorbing means containing a pressure medium having a predetermined first pressure and a drain pressure maintaining means, associated with a drain line and active on said drain line at an orientation downstream of said back pressure absorbing means for maintaining fluid pressure in the drain line upstream thereof at a predetermined second pressure higher than said first pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification