Trailer length estimation method using trailer yaw rate signal
First Claim
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1. A backup assist system for a vehicle reversing a trailer, comprising:
- a trailer sensor outputting a trailer yaw rate;
a vehicle sensor system outputting a vehicle yaw rate and a vehicle speed; and
a controller;
estimating a hitch angle between the vehicle and the trailer using an integration of a difference between the trailer yaw rate and the vehicle yaw rate over time;
estimating a length of the trailer using the estimated hitch angle, the vehicle yaw rate, the vehicle speed, and the trailer yaw rate in a kinematic relationship; and
using the trailer length in the kinematic relationship to control the vehicle.
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Abstract
A backup assist system for a vehicle reversing a trailer includes a trailer sensor module generating a trailer yaw rate and a vehicle sensor system generating a vehicle yaw rate and a vehicle speed. The system further includes a controller determining an estimated length of the trailer based on an estimated hitch angle, the vehicle yaw rate, the vehicle speed, and the trailer yaw rate in view of a kinematic relationship.
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Citations
20 Claims
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1. A backup assist system for a vehicle reversing a trailer, comprising:
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a trailer sensor outputting a trailer yaw rate; a vehicle sensor system outputting a vehicle yaw rate and a vehicle speed; and a controller; estimating a hitch angle between the vehicle and the trailer using an integration of a difference between the trailer yaw rate and the vehicle yaw rate over time; estimating a length of the trailer using the estimated hitch angle, the vehicle yaw rate, the vehicle speed, and the trailer yaw rate in a kinematic relationship; and using the trailer length in the kinematic relationship to control the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A backup assist system for a vehicle reversing a trailer, comprising:
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a first sensor coupled with the trailer for determining a trailer yaw rate; a second sensor coupled with the vehicle for determining a vehicle yaw rate; and a controller; estimating a hitch angle between the vehicle and the trailer using an integration of a difference between the trailer yaw rate and the vehicle yaw rate over time; determining an estimated length of the trailer using the estimated hitch angle, the vehicle yaw rate, the vehicle speed, and the trailer yaw rate as inputs to a kinematic relationship between the trailer and the vehicle; and controlling a steering system of the vehicle using the estimated length of the trailer as a further input to the kinematic relationship. - View Dependent Claims (13, 14, 15, 16)
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17. A method for reversing a trailer towed by a vehicle, comprising:
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receiving a trailer yaw rate signal; receiving a vehicle yaw rate signal; receiving a vehicle speed signal; estimating a hitch angle between the vehicle and the trailer using an integration of a difference between the trailer yaw rate signal and the vehicle yaw rate signal over time; determining an estimated length of the trailer using the estimated hitch angle, the vehicle yaw rate signal, the vehicle speed signal, and the trailer yaw rate signal as inputs to a kinematic relationship between the trailer and the vehicle; and controlling a vehicle steering system using the estimated length of the trailer as a further input to the kinematic relationship. - View Dependent Claims (18, 19, 20)
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Specification