Tire-Mounted Acceleration Sensor Sampling for Power Reduction
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Solution Overview
Problem
Conventional road surface information collection devices consume battery power rapidly, necessitating the development of technologies that reduce power consumption.
Innovation Solution
A road surface information collection device with an acceleration sensor attached to a vehicle's tire, featuring a first sampling unit, position calculator, second sampling unit, speed calculator, and predetermined range determination unit, which adjust sampling cycles based on tire rotation speed to optimize data collection and minimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the acceleration sensor continuously samples detection results with a short sampling cycle to collect precise road surface information, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic sampling with two different cycles: a first sampling cycle for continuous monitoring and a second, shorter sampling cycle activated only when the acceleration sensor detects specific vibration patterns indicating road surface information. This periodic action with variable intervals allows precise data collection only when necessary, reducing overall power consumption while maintaining measurement precision when road surface information is present
Solution Approach 2:
The sampling cycle is made dynamic rather than fixed. The system automatically adjusts between the first and second sampling cycles based on real-time detection conditions. When the acceleration sensor detects vibrations within a predetermined range indicating tire contact with the road surface, it switches to the second sampling cycle for high-precision data collection, otherwise uses the first sampling cycle for monitoring, thereby adapting power consumption to actual measurement needs
2Loss of information
If the acceleration sensor samples detection results at all rotational positions of the tire to ensure complete data coverage, then measurement completeness is improved, but unnecessary power consumption increases
Solution Approach 1:
The patent extracts and processes only the relevant portion of sampling data corresponding to the back side of the tire (within a predetermined range including the back side of the point on the tire in contact with the ground). By filtering out data from irrelevant rotational positions and focusing only on the region where road surface information is actually generated, the system achieves complete road surface information collection without the energy waste of sampling at all rotational positions
Solution Approach 2:
Different sampling strategies are applied to different regions of the tire's rotational path. The system uses the first sampling cycle for positions outside the predetermined range and the second sampling cycle only within the predetermined range at the back side of the tire. This local differentiation ensures that high-precision sampling is applied only where road surface information is present, reducing overall power consumption while maintaining information completeness
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
The device effectively reduces power consumption by adjusting sampling cycles, allowing for precise road surface information collection while minimizing unnecessary power usage, even during high-speed rotations.
Implementation Method 1
acceleration sensors attached to the inner circumferential surfaces of tires to collect road surface information based on vibration and shock detected by the acceleration sensors
Implementation Method 2
a position calculator that calculates a rotational position of the acceleration sensor based on changes in the first sampling data
Implementation Method 3
a speed calculator that detects a rotation speed of the tire based on changes in the first sampling data
Data Source
Figure 1
Figure 2
Figure 3(A)~3(B)
AI summary
A road surface information collection device that consumes less power than conventional counterparts is provided. The road surface information collection device 10 according to the present disclosure samples the acceleration applied to an acceleration sensor 13 with a first sampling cycle S1, and a second sampling cycle S2 that is shorter than that. A rotational position of the acceleration sensor 13 is computed based on changes in first sampling data obtained by the sampling performed with the first sampling cycle S1, and detection results of the acceleration sensor 13 are sampled with the second sampling cycle S2 based on a condition that the acceleration sensor 13 is positioned within a first predetermined range L1 including a back side of a point on a tire 92 in contact with a ground to obtain second sampling data.