Tire Vibration Sensing for Low-Power Road Surface Detection
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Solution Overview
Problem
Existing road surface state determination devices face challenges in reducing power consumption while effectively determining road surface states, particularly due to limited battery life in tire-side devices.
Innovation Solution
A road surface state determination device comprising a tire-side device and a vehicle-body-side system, where the tire-side device includes a vibration detection unit, a control unit, and a data communication unit to generate and transmit road surface data, and the vehicle-body-side system performs bidirectional communication and determines the road surface state based on the received data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the tire-side device continuously transmits vibration data to the vehicle-body-side system, then the road surface state determination accuracy is improved, but the power consumption increases
Solution Approach 1:
The patent applies partial action by selectively transmitting only certain vibration data that is most relevant for road surface state determination. The tire-side device performs preliminary processing to identify significant vibration patterns and transmits only those data points, rather than continuously transmitting all vibration data. This reduces communication power consumption while maintaining sufficient accuracy for road surface state determination.
Solution Approach 2:
The patent implements preliminary action by performing vibration data processing and feature extraction at the tire-side device before transmission. The control unit analyzes the raw vibration data locally, extracts relevant features indicating road surface conditions, and prepares optimized data for transmission. This preliminary processing reduces the amount of data that needs to be transmitted and processed by the vehicle-body-side system, thereby reducing overall power consumption while maintaining determination accuracy.
2Measurement precision
If the tire-side device performs comprehensive vibration analysis, then the road surface state determination accuracy is improved, but the computational load and processing time increase
Solution Approach 1:
The patent extracts only the essential features from comprehensive vibration data that are most indicative of road surface states. The control unit identifies and extracts key vibration characteristics such as frequency components, amplitude patterns, and temporal features that directly correlate with different road surface conditions. By focusing on these extracted features rather than analyzing all raw data comprehensively, the system achieves accurate road surface state determination with reduced processing time and computational load.
Solution Approach 2:
The patent segments the vibration analysis into distinct processing stages and feature categories. The control unit divides the complex vibration signal analysis into separate tasks such as frequency domain analysis, time domain feature extraction, and pattern recognition. This segmentation allows for more efficient processing by handling different aspects of vibration analysis independently and in parallel where possible, reducing overall processing time while maintaining comprehensive analysis accuracy.
3Loss of information
If the tire-side device transmits raw vibration data, then the vehicle-body-side system has more information for analysis, but the communication data volume and transmission power increase
Solution Approach 1:
The patent creates a simplified representation or copy of the essential vibration information rather than transmitting the complete raw vibration data. The tire-side device generates processed data that captures the critical features and patterns of the original vibration signal, such as extracted frequency spectra, amplitude envelopes, and identified vibration patterns. This copied information maintains the necessary completeness for accurate road surface state determination while significantly reducing the data volume and transmission power requirements compared to sending raw vibration data.
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 solution enables reliable determination of road surface states while reducing power consumption, allowing for efficient data transmission and processing to support vehicle safety and control systems.
Implementation Method 1
a vibration detection unit that outputs a detection signal corresponding to a magnitude of vibration of the tire
Data Source
AI summary
A road surface state determination device includes a tire-side device and a vehicle-body-side system. The tire-side device is attached to each of a plurality of tires included in a vehicle. The vehicle-body-side system is included in a body of the vehicle. The tire-side device may output a detection signal corresponding to a magnitude of vibration of the tire. The tire-side device may sense the detection signal and generate road surface data indicative of a road surface state appearing in a waveform of the detection signal. The tire-side device may transmit the road surface data. The vehicle-body-side system may perform bidirectional communication with the tire-side device and receive the road surface data. The vehicle-body-side system may determine the road surface state of a road surface on which the vehicle is traveling based on the road surface data.