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Control system for an active suspension system in a motor vehicle and method for controlling motor vehicle handling around curves

  • US 5,481,459 A
  • Filed: 10/31/1994
  • Issued: 01/02/1996
  • Est. Priority Date: 11/05/1993
  • Status: Expired due to Fees
First Claim
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1. A suspension system assembly comprising:

  • at least one shock absorber, said at least one shock absorber comprising;

    a sealed cylinder defining a chamber therein, said cylinder containing a damping fluid;

    said cylinder having a first end and a second end;

    a piston rod sealingly projecting into said cylinder and being axially displaceable with respect to said cylinder;

    said first end of said cylinder being disposed at said piston rod;

    a piston being attached to said piston rod, said piston being slidably disposed within said cylinder to sealingly divide said chamber into first and second chambers;

    means for permitting flow of damping fluid between said first and second chambers;

    said cylinder having an inner wall disposed towards said piston rod and an outer wall disposed radially away from said piston rod;

    a central longitudinal axis defined through said sealed cylinder, the central longitudinal axis defining a longitudinal direction of said shock absorber;

    means for the recognition of cornering for a vehicle with an active hydraulic system;

    said means for the recognition of cornering for a vehicle with an active hydraulic system comprising a supply pump for the hydraulic system, a plurality of actuators, a number of valves for control of the actuators and a measuring device for determination of vehicle movement parameters;

    said means for the recognition of cornering for a vehicle with an active hydraulic system further comprising;

    means for measuring a vehicle acceleration signal "a";

    means for providing an acceleration threshold value "as ";

    means for comparing said vehicle acceleration signal "a" to said acceleration threshold value "as ";

    means for measuring a vehicle velocity signal "v";

    means for providing a lower vehicle velocity threshold value "vu ";

    means for comparing said vehicle velocity signal "v" to a lower vehicle velocity threshold value "vu ";

    means for providing an upper vehicle velocity threshold value "vo "means for comparing said vehicle velocity signal "v" to said upper vehicle velocity threshold value "vo ";

    means for providing a steering angle threshold value "sdelta ";

    means for detecting a steering movement as a steering angle;

    said means for detecting a steering movement as a steering angle comprising means for detecting said steering angle below and above said steering angle threshold value "sdelta ";

    means for actuating power to the suspension system;

    said means for actuating power to the suspension system comprising means for providing a signal to said valves for control of the actuators;

    said means for providing a signal to said valves for control of the actuators comprising means for providing a signal to said valves at a vehicle velocity in the vehicle velocity range between the vehicle velocity threshold values "vu " and "vo ";

    said means for providing a signal to said valves at a vehicle velocity in the vehicle velocity range between the vehicle velocity threshold values "vu " and "vo " comprising means for providing a signal to said valves only if the actual measured acceleration "a" increases above the acceleration threshold value "as " at the same time as the vehicle velocity is in the vehicle velocity range between the vehicle velocity threshold values "vu " and "vo ";

    a spring for applying a substantially longitudinally directed force with said shock absorber;

    said spring being operatively connected to apply the force to said shock absorber.

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