Speedometer Installation on Curved Roads Using Reference Axis
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Solution Overview
Problem
Current methods for installing traffic control speedometers are inadequate for measuring vehicle speeds on curved roads, as they fail to maintain the required measurement angle precision, leading to invalid speed measurements.
Innovation Solution
A method involving a sighting system with a fixed mounting angle, where a reference axis is determined based on the road's curvature to adjust the speedometer's orientation, ensuring the measurement angle deviation remains within acceptable limits, even on bends, by placing marks at specific distances and using a chord to establish a reference axis parallel to the vehicle's speed vector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the speedometer is installed using conventional methods on curved roads, then the installation process remains simple, but the measurement angle precision deteriorates and becomes invalid
Solution Approach 1:
The method determines a reference axis before installing the speedometer, based on the road's curvature characteristics. This preliminary determination of the correct orientation reference allows the speedometer to be installed with proper measurement angle precision even on curved roads, rather than using conventional simple installation methods that ignore road geometry
Solution Approach 2:
The invention changes the installation parameters by introducing a reference axis that accounts for road curvature radius and bend angle. Instead of using fixed installation angles, the method adjusts the speedometer orientation based on calculated parameters derived from road geometry, ensuring measurement validity on curved sections
2Reliability
If the speedometer is oriented to maintain measurement angle precision on bends, then measurement reliability improves, but the installation complexity increases
Solution Approach 1:
The method introduces a reference axis as an intermediary element that mediates between the road geometry and the speedometer orientation. This reference axis, determined from road curvature parameters, serves as a simple guide for installers to achieve correct positioning without complex adjustment procedures
Solution Approach 2:
By pre-calculating the reference axis based on road survey data before installation, the method eliminates the need for complex real-time adjustments during installation. The reference axis provides a clear orientation guide that simplifies the installation process while ensuring measurement reliability
3Manufacturing precision
If marks are placed at greater distances from the speedometer, then the reference axis determination becomes more accurate, but the installation time increases
Solution Approach 1:
The method optimizes the mark placement distance as a parameter, determining the appropriate distance based on road curvature radius and required precision. This parameter-based approach allows installers to quickly determine correct mark positions without trial and error, balancing accuracy requirements with installation efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for precise and reliable speed measurements on roads with bends, adhering to industry standards by minimizing the difference between the mounting and measurement angles, thus ensuring valid speed data across various road configurations.
Implementation Method 1
The speed of the vehicle is then deduced from the measurement carried out by a method which is known per se, for example by Doppler effect quantification
Data Source
AI summary
The invention relates to a method for installing a speed-detection device on a road (100), said speed-detection device having a radioelectric line (11) for measuring a speed of at least one vehicle (30) travelling along the road (100), and a line of sight (12) forming a fixed mounting angle (?) with said radioelectric line (11), wherein the road (100) forms a bend such that a difference (a) between the measuring angle (?) and the mounting angle (?) would be higher than 0.5? if one of the methods of the prior art for a substantially straight road were to be implemented, said method thus comprising a step of determining a reference axis (106) for identifying a longitudinal direction of the road (100) according to the radius of curvature of the bend, in such a way that when the line of sight (12) is parallel to the reference axis (106), the difference (a) is reduced to less than 0.5?.