Trailer Length Estimation from Steering and Connection Angles
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Solution Overview
Problem
Existing trailer length estimation techniques require complex configurations and may not accurately determine trailer length during unsteady turns.
Innovation Solution
A trailer length estimation device that utilizes a turning angle detector and connection angle detector to derive trailer length from a connecting device to the trailer wheels based on steady turns, employing a simple configuration and advanced calculation methods to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a trailer sensor that detects trailer yaw rate is attached to the trailer, then trailer length estimation can be performed, but the device configuration becomes complex
Solution Approach 1:
The patent extracts the trailer yaw rate detection function from a dedicated trailer sensor and replaces it with detection of the connection angle between tractor and trailer. By measuring only the connection angle at the coupling point and combining it with steering angle data, the system eliminates the need for complex trailer-mounted sensors while maintaining estimation capability
Solution Approach 2:
The connection angle detector serves multiple functions: it detects the relative orientation between tractor and trailer, enables calculation of trailer yaw rate through mathematical processing, and provides data for trailer length estimation. This multi-functional approach replaces the need for separate dedicated sensors
2Productivity
If trailer length is estimated during unsteady turns, then more data points are available, but estimation accuracy deteriorates
Solution Approach 1:
The patent changes the operational parameter from accepting all turning conditions to specifically selecting steady turn conditions for estimation. By monitoring turn stability characteristics and only performing calculations during steady turns, the system ensures higher accuracy while maintaining productive use of available data
Data Source
AI summary
A trailer length estimation device for estimating, in a vehicle including a tractor and a trailer connected to the tractor by a connecting device, a trailer length from the connecting device to the wheels of the trailer includes: an acquisition unit that acquires a turning angle of a wheel of the tractor and a connection angle of the trailer with respect to the tractor, the turning angle being detected by a turning angle detector, and the connection angle being detected by a connection angle detector; and a derivation unit that derives the trailer length based on the acquired turning angle and the acquired connection angle when the vehicle is making a steady turn.