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Drive assist system for a vehicle and the method thereof

  • US 5,808,561 A
  • Filed: 03/17/1997
  • Issued: 09/15/1998
  • Est. Priority Date: 04/10/1996
  • Status: Expired due to Fees
First Claim
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1. A drive assist system for a vehicle having inter-vehicle distance calculating means for detecting a preceding vehicle running ahead of the vehicle and for calculating an inter-vehicle distance between the vehicle and the preceding vehicle, vehicle speed calculating means for calculating a vehicle speed of the vehicle, preceding vehicle speed calculating means for calculating a vehicle speed of the preceding vehicle based on the inter-vehicle, distance and the vehicle speed of the vehicle and collision preventing means for preventing a collision of the vehicle with the preceding vehicle, said drive assist system comprising:

  • preceding vehicle deceleration calculating means for calculating a deceleration of the preceding vehicle based on the vehicle speed of the preceding vehicle;

    leeway time calculating means responsive to said deceleration of the preceding vehicle for calculating a leeway time;

    safe inter-vehicle distance establishing means responsive to said leeway time and the vehicle speed for establishing a safe inter-vehicle distance between the vehicle and the preceding vehicle at least based on a multiplication of said leeway time and the vehicle speed of the vehicle;

    inter-vehicle distance comparing means for comparing the inter-vehicle distance with said safe inter-vehicle distance and for outputting a signal when the inter-vehicle distance is smaller than said safe inter-vehicle distance; and

    outputting means responsive to said signal for outputting an operation signal so as to operate the collision preventing means.

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