Wheel Pulse Inspection for Roller-Free Vehicle Speed Checks
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Solution Overview
Problem
Conventional vehicle speed inspection methods require the use of a roller device to support the wheel, which is inefficient and costly in terms of space and resources.
Innovation Solution
A method for vehicle speed inspection that utilizes sensors to output pulses based on wheel rotation, allowing for the comparison of target and reference pulse numbers to determine vehicle speed abnormalities without the need for a roller device, enabling simultaneous inspections while the vehicle moves and operates at low speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a roller device is used to support the wheel for vehicle speed inspection, then measurement accuracy can be ensured, but device complexity and space requirements increase
Solution Approach 1:
The patent extracts the essential measurement function from the complex roller device. Instead of using a roller to support and rotate the wheel, the invention uses a sensor to detect wheel rotation pulses and compares them with reference values. This extracts only the necessary measurement capability while eliminating the mechanical roller structure, thereby reducing device complexity while maintaining measurement accuracy.
Solution Approach 2:
The patent replaces the mechanical roller system with an electronic sensing system. The roller device that mechanically supported and rotated the wheel is substituted with sensors that detect wheel rotation through pulse signals. This mechanical-to-electronic substitution simplifies the device structure while preserving the ability to accurately measure vehicle speed.
2Measurement precision
If vehicle speed inspection is performed separately from position movement, then measurement accuracy is improved, but productivity decreases
Solution Approach 1:
The patent enables continuous useful action by performing vehicle speed inspection simultaneously with position movement. The sensor-based system allows the vehicle to move through different positions while continuously measuring wheel rotation pulses. This eliminates the need to stop the vehicle for inspection, maintaining continuous productive operation while ensuring accurate speed measurement through pulse comparison.
Solution Approach 2:
The patent merges the position movement process with the vehicle speed inspection process. Instead of performing these as separate operations, the system combines them by using the same vehicle movement for both positioning and speed measurement. The pulse signals generated during normal movement are used for inspection purposes, thereby combining two useful actions into one continuous process.
3Productivity
If vehicle speed inspection is performed at higher speeds, then productivity increases, but measurement precision may deteriorate
Solution Approach 1:
The patent uses parameter changes to maintain measurement precision across different speeds. The system compares pulse numbers generated during vehicle movement with reference pulse numbers that correspond to expected speeds. By adjusting and comparing pulse frequency and count parameters against predetermined reference values, the system can accurately measure speed regardless of whether the vehicle is moving slowly or quickly, thereby maintaining precision while allowing productive inspection speeds.
Data Source
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AI summary
In an inspection method, a target pulse number indicating a number of a plurality of pulses in accordance with rotation of a wheel of a vehicle is acquired. The plurality of pulses is output from a sensor while the vehicle runs a predetermined reference distance. The acquired target pulse number and a predetermined reference pulse number are compared to one another to determine an abnormality related to vehicle speed of the vehicle.