International Journal of Automotive Technology

The Korean Society of Automotive Engineers (한국자동차공학회)
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FUZZY ESTIMATION OF VEHICLE SPEED USING AN ACCELEROMETER AND WHEEL SENSORS

  • HWANG J. K. (Department of Electrical Engineering, Woosuk University) ;
  • SONG C. K. (School of Mechanical and Aerospace Engineering, Engineering Research Institute (ERI), Gyeongsang National University)
  • Published : 2005.06.01
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Abstract

The absolute longitudinal speed of a vehicle is estimated by using data from an accelerometer of the vehicle and wheel speed sensors of a standard 50-tooth antilock braking system. An intuitive solution to this problem is, 'When wheel slip is low, calculate the vehicle velocity from the wheel speeds; when wheel slip is high, calculate the vehicle speed by integrating signal of the accelerometer.' The speed estimator weighted with fuzzy logic is introduced to implement the above concept, which is formulated as an estimation method. And the method is improved through experiments by how to calculate speed from acceleration signal and slip ratios. It is verified experimentally to usefulness of estimation speed of a vehicle. And the experimental result shows that the estimated vehicle longitudinal speed has only a $6\%$ worst-case error during a hard braking maneuver lasting a few seconds.

Keywords

References

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