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Vehicle travel direction estimating device

  • US 5,267,166 A
  • Filed: 12/27/1991
  • Issued: 11/30/1993
  • Est. Priority Date: 12/27/1990
  • Status: Expired due to Fees
First Claim
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1. A vehicle travel direction estimating device for repeatedly estimating a travel direction of a vehicle, comprising:

  • wheel speed calculation means for measuring a rotational velocity of a wheel of said vehicle and for producing an absolute value of said rotational velocity as a wheel speed of said wheel during each repeated estimating;

    estimated vehicle acceleration calculation means for calculating an estimated vehicle acceleration Aw as a function of said wheel speed;

    gravity-type accelerometer for producing a gravitationally detected acceleration Am;

    first differentiating means for differentiating said gravitationally detected acceleration Am and for producing a first differential value Dam;

    second differentiating means for differentiating said estimated vehicle acceleration Aw and for producing a second differential value Daw;

    detection means for detecting said travel direction of said vehicle based on said first and second differential values Dam and Daw; and

    means for controlling a braking of said vehicle in response to said detected travel direction of said vehicle.

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