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Method for quantitatively analyzing steer characteristics to acquire steering stability of vehicles/tires

  • US 20060074535A1
  • Filed: 12/17/2004
  • Published: 04/06/2006
  • Est. Priority Date: 10/05/2004
  • Status: Active Grant
First Claim
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1. A method for quantitatively analyzing steer characteristics to acquire steering stability of a vehicle and a tire, comprising the steps of:

  • mounting a real-vehicle measurement device to a vehicle;

    performing a variety of real-vehicle tests, i.e., a lane-changing test, a severe lane-changing test, a circuit cornering test, and a power on/off test in a vehicle turning operation, and acquiring measurement data;

    calculating a turning curvature, a turning velocity, a nose angle, and a nose-angle time rate on the basis of the acquired measurement data;

    comparing the turning curvature, the turning velocity, the nose angle, and the nose-angle time rate with reference data, i.e., a reference turning curvature, a reference turning velocity, and reference nose-angle data, respectively;

    calculating a slope of the nose angle, a change rate, and a change amount during the power on/off test; and

    determining a steer characteristic degree on the basis of the result of the comparison.

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