Curve's radius estimation device
First Claim
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1. A curve'"'"'s radius estimation device for estimating a curve'"'"'s radius of a road on which a vehicle shall run, comprising:
- a vehicle speed sensor that detects an actual speed of the vehicle;
a yaw rate sensor that detects an actual yaw rate of the vehicle;
a steering angle sensor that detects an angle of a steering wheel handled by a driver of the vehicle as an actual steering angle; and
an estimator that estimates the curve'"'"'s radius on the basis of the actual vehicle speed detected by the vehicle speed sensor, the actual yaw rate detected by the yaw rate sensor, and the actual steering angle detected by the steering angle sensor, wherein the estimator comprises;
a base value estimation part that estimates the curve'"'"'s radius as a base value on the basis of the actual vehicle speed and the actual yaw rate but not of the steering angle; and
an estimation part that determines an amount of correction for the base value on the basis of physical quantity regarding the steering angle, and estimates the curve'"'"'s radius by correcting the base value with the amount of correction.
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Abstract
A curve'"'"'s radius of a road on which a vehicle shall run is estimated based on actual speed, yaw rate, and steering angle of the vehicle. Accordingly, during a transition state of the vehicle, the curve'"'"'s radius can be estimated with the actual yaw rate taking into account the actual steering angle that can reflect more accurately turning behavior of the vehicle than the actual yaw rate. Therefore, errors in the estimation of the curve'"'"'s radius due to response delay of the actual yaw rate can be easily reduced even though the yaw rate is used for such estimation.
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Citations
7 Claims
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1. A curve'"'"'s radius estimation device for estimating a curve'"'"'s radius of a road on which a vehicle shall run, comprising:
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a vehicle speed sensor that detects an actual speed of the vehicle; a yaw rate sensor that detects an actual yaw rate of the vehicle; a steering angle sensor that detects an angle of a steering wheel handled by a driver of the vehicle as an actual steering angle; and an estimator that estimates the curve'"'"'s radius on the basis of the actual vehicle speed detected by the vehicle speed sensor, the actual yaw rate detected by the yaw rate sensor, and the actual steering angle detected by the steering angle sensor, wherein the estimator comprises; a base value estimation part that estimates the curve'"'"'s radius as a base value on the basis of the actual vehicle speed and the actual yaw rate but not of the steering angle; and an estimation part that determines an amount of correction for the base value on the basis of physical quantity regarding the steering angle, and estimates the curve'"'"'s radius by correcting the base value with the amount of correction. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification