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Closed level control system for a vehicle with the system having two pressure stores

  • US 7,032,895 B2
  • Filed: 07/11/2003
  • Issued: 04/25/2006
  • Est. Priority Date: 07/11/2002
  • Status: Expired due to Fees
First Claim
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1. A closed level control system for a vehicle having a vehicle body, vehicle axles and pressurized medium chambers with which the vehicle body is suspended relative to corresponding ones of said vehicle axles, the closed level control system comprising:

  • pressurized medium supply vessel means having first and second pressurized medium spaces for holding a medium under pressure as a pressurized medium;

    said first and second pressurized medium spaces having no direct connection therebetween;

    a compressor for transferring said pressurized medium between said pressurized medium supply vessel means and said pressurized medium chambers;

    said compressor having an input and an output;

    first and second controllable directional valves and each one of said valves having at least two switching states comprising a first and a second switching state;

    said first controllable directional valve being switchable to connect either said first pressurized medium space or said second pressurized medium space to said compressor input or to said compressor output so that pressurized medium from said pressurized medium chambers can be transferred into said first pressurized medium space or into said second pressurized medium space or pressurized medium from said first pressurized medium space or from said second pressurized medium space can be transferred to said pressurized medium chambers;

    wherein said pressurized medium is pressurized air and said system further comprises;

    a first pressurized air line connecting said first controllable directional valve to said input of said compressor;

    a second pressurized air line connecting said output of said compressor to said second controllable directional valve;

    a third pressurized air line connecting said input of said compressor to said second controllable directional valve;

    a fourth pressurized air line connecting said output of said compressor to said first controllable directional valve;

    said pressurized medium chambers being connected to said second controllable directional valve;

    said first pressurized air line being switched through by said first controllable directional valve in said first switching state thereof and said second pressurized air line being switched through by said second controllable directional valve in said first switching state thereof and said fourth pressurized air line being blocked by said first controllable directional valve in said first switching state thereof and said third pressurized air line being blocked by said second controllable directional valve in said first switching state thereof when pressurized air is transferred from one of said first and second pressurized medium spaces into one of said pressurized medium chambers;

    said third pressurized air line being switched through by said second controllable directional valve in said second switching state thereof and said fourth pressurized air line being switched through by said first controllable directional valve in said second switching state thereof and said first pressurized air line being blocked by said first controllable directional valve in said second switching state thereof and said second pressurized air line being blocked by said second controllable directional valve in said second switching state thereof wherein pressurized air is transferred from one of said pressurized medium chambers into one of said first and second pressurized medium spaces;

    a third controllable directional valve interposed between said first controllable directional valve and said pressurized medium spaces and said third controllable directional valve likewise having at least two switching states comprising a first and a second switching state;

    said third controllable directional valve being switched into said first switching state thereof to provide a connection from said first controllable direction valve to said first pressurized medium space and to block a connection to said second pressurized medium space; and

    ,said third controllable directional valve being switched into said second switching state thereof to provide a connection from said first controllable directional valve to said second pressurized medium space and to block a connection to said first pressurized medium space.

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