Lane Departure Warning Trailer Mode Threshold
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Solution Overview
Problem
Conventional lane departure warning systems fail to adequately detect when a vehicle towing a trailer, especially one wider than the host vehicle, departs from a lane due to using a threshold width value based solely on the host vehicle's width, leading to delayed alerts.
Innovation Solution
A vehicle lane departure warning system that includes an imager, a processor, and a towing signal input to adjust the threshold width value based on whether a trailer is being towed, allowing for enhanced detection and warning of lane departure for both the vehicle and trailer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the threshold width value is based on the host vehicle width, then the lane departure warning system works adequately for conventional vehicles, but it fails to adequately detect when a wider trailer departs from the lane
Solution Approach 1:
The system dynamically adjusts the threshold width value based on detected vehicle configurations. When a trailer is detected (through manual input or automatic recognition), the system switches from using the host vehicle width threshold to an enhanced threshold that accounts for the trailer's extended width, making the detection criterion adaptive to the actual roadway occupancy
Solution Approach 2:
The system changes the critical parameter (threshold width value) based on the vehicle configuration state. By modifying the threshold from the host vehicle width to an enhanced value that includes trailer width considerations, the system maintains measurement precision across different towing scenarios without requiring complete system redesign
2Reliability
If the LDW system uses a fixed threshold based on host vehicle width, then the system design is simple, but the system cannot provide timely warnings when towing a wider trailer
Solution Approach 1:
The system maintains a single unified LDW platform that serves multiple functions: it detects both host vehicle lane departures and trailer lane departures. By adding the capability to adjust the threshold width value based on towing status, the system becomes universal enough to handle both conventional and trailer-towing scenarios without requiring separate detection systems
Solution Approach 2:
The system performs preliminary detection of the towing status (through manual input or automatic recognition) and pre-adjusts the threshold width value before lane departure detection begins. This preliminary configuration ensures that the detection algorithm uses the appropriate threshold from the start, preventing delayed warnings
Data Source
AI summary
A vehicle lane departure warning system and method are provided having a trailer mode. The system includes an imager capturing images of a roadway forward of a vehicle and an input receiving a towing signal indicative of whether the vehicle is towing a trailer. The system also includes a processor for processing the captured images and determining whether the vehicle or trailer is expected to be departing from a lane on the roadway based on the captured images and a threshold width value. The processor selects the threshold width value based on the input towing signal such that an enhanced threshold width value is employed when the vehicle is towing a trailer. An output is provided for outputting a lane departure warning signal based on the processed images and selected threshold width value.