| FUZZY ESTIMATION OF VEHICLE SPEED USING AN ACCELEROMETER AND WHEEL SENSORS |
| J. K. HWANG1, C. K. SONG2 |
1Woosuk University
2Gyeongsang National University |
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| ABSTRACT |
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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. |
| Key Words:
Vehicle speed, Speed estimation, Fuzzy logic, Slip ratio, ABS, Wheel speed, Accelerometer |
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