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Suspension control system cooperated with steering control system for vehicle

  • US 5,116,078 A
  • Filed: 11/05/1990
  • Issued: 05/26/1992
  • Est. Priority Date: 11/06/1989
  • Status: Expired due to Fees
First Claim
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1. A control system for a vehicle comprising:

  • means for providing a supply of hydraulic fluid;

    a plurality of hydraulic cylinders, each of said hydraulic cylinders provided between a vehicle body and one of a plurality of vehicle wheels;

    proportional flow control valves for controlling the supply of hydraulic fluid to each of the hydraulic cylinders;

    a vehicle suspension system controller for controlling said proportional flow control valves in accordance with a desired roll displacement;

    a manual switch for selecting one of a normal roll control mode, in which said desired roll displacement value is zero, and a sporty roll control mode, in which said desired roll displacement value is not necessarily zero;

    a rear wheel steering mechanism for steering right and left rear vehicle wheels; and

    a four wheel system controller for selecting one of a stronger phase steering property and a weaker phase steering property;

    said vehicle suspension system controller cooperating with said four wheel system controller for (1) selecting one of the steering properties over the other and controlling said rear wheel steering mechanism based on said one of the steering properties, (2) computing a lateral acceleration of the vehicle, (3) judging if said lateral acceleration is in a particular range, (4) setting said desired roll displacement to a non-zero value if said lateral acceleration is in said particular range, (5) setting said desired roll displacement to a value of zero if said lateral acceleration is not in said particular range, and (6) performing roll control in accordance with said sporty roll control mode, if said sporty roll control mode is selected by said manual switch; and

    (1) setting said desired roll displacement to a value of zero, and (2) selecting the other of the steering properties and controlling said rear wheel steering mechanism based on the other of the steering properties, if said normal roll control mode is selected by said manual switch.

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