Patent attributes
A driver assistance method and system senses the presence of a trailer secured to a host vehicle and provides an indication thereof. When a yaw rate for the vehicle exceeds a predetermined value during turning of the host vehicle, the system determines the length of the trailer. To determine trailer length, reflection points from an output of a rear sensor unit are sensed to detect a side wall of the trailer. The farthest reflection point of the trailer is utilized to determine a longitudinal distance and a transverse distance of the trailer with respect to the reflection sensor. The longitudinal distance corresponds to a longitudinal axis of the host vehicle and the transverse axis is transverse to the longitudinal axis. The trailer length is estimated from the yaw rate that provides a trailer angle relative to the host vehicle, and the longitudinal and transverse distances. From the trailer length, the system provides combined blind spot detection zones adjacent the host vehicle, and adjacent to the side of and extending beyond the rear of the trailer. The system also provides lane change assistance.
