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Power steering apparatus for a vehicle with yaw control

  • US 5,078,226 A
  • Filed: 06/14/1990
  • Issued: 01/07/1992
  • Est. Priority Date: 06/15/1989
  • Status: Expired due to Fees
First Claim
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1. A power steering system for a vehicle having wheels to be steered, comprising:

  • a steering member;

    a steering mechanism for connecting the steering member with said wheels to be steered so that said wheels are steered in accordance with a movement of the steering member;

    means for generating an assisting force in the steering mechanism for reducing an effort which is necessary for moving the steering member when carrying out a steering operation;

    means for detecting a vehicle speed;

    means for detecting a condition of the steering member during an operation thereof;

    means for detecting an actual yaw rate of the vehicle;

    means for detecting whether said actual yaw rate matches a degree of an operation of the steering member, while taking at least the vehicle speed into consideration; and

    means for generating, only when it is determined that the actual yaw rate does not match a degree of operation of the steering member, a counter steering force to be applied to the steering mechanism in a direction corresponding to a situation of the vehicle which has caused the determined difference between degree of operation and actual yaw rate, thereby alerting a driver to drive the vehicle safely in accordance with said situation.

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