Tire Vibration Sensor for Road Surface Detection
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Solution Overview
Problem
Conventional road surface condition determination devices rely on acceleration sensors attached to tire treads to detect vibrations, but they face challenges in accurately determining road surface conditions, particularly in varying weather conditions like wet or frozen roads, and require efficient data transmission and processing to enable timely vehicle control and driver notification.
Innovation Solution
A road surface condition determination device comprising tire side devices with vibration detection units, control units for signal processing, and data communication units that transmit road surface data to a vehicle body side system, which includes a road surface determination unit using support vectors to analyze characteristic values from tire vibrations, enabling accurate condition assessment and vehicle control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If vibration detection is performed continuously on all tires to improve road surface condition determination accuracy, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The system divides the four tires into two groups (left side and right side) and performs vibration detection selectively on one group at a time. The control unit switches between left and right side detection, so that not all tires are monitored simultaneously, reducing overall power consumption while still achieving comprehensive road surface condition assessment through alternating measurements.
Solution Approach 2:
The vibration detection is performed periodically by alternating between left and right side tires. The control unit schedules detection cycles where one side is monitored, then switches to the other side after a predetermined period. This periodic switching pattern reduces continuous power consumption while maintaining adequate measurement coverage for road surface condition determination.
2Reliability
If vibration detection is performed on all tires simultaneously to improve reliability of road surface condition determination, then reliability is improved, but power consumption increases
Solution Approach 1:
The system segments the tire monitoring into left and right side groups, performing detection on one segment at a time. By switching between segments rather than activating all simultaneously, the system maintains reliable data collection through systematic coverage while reducing peak power consumption demands.
Solution Approach 2:
The system implements periodic switching between left and right side detection cycles. Over time, both sides are monitored with sufficient frequency to maintain determination reliability, but at any given moment only one side consumes active detection power, reducing overall energy usage compared to continuous simultaneous monitoring of all tires.
3Measurement precision
If road surface data is transmitted from all tires to the vehicle body side system to improve determination accuracy, then measurement precision is improved, but data transmission complexity increases
Solution Approach 1:
The system extracts and transmits only the essential road surface data from the vibrating tires to the vehicle body side receiver, rather than transmitting all raw vibration signals. The control unit processes and selects key parameters for transmission, reducing data transmission complexity while maintaining sufficient information for accurate road surface condition determination.
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 system effectively determines road surface conditions, reduces power consumption by optimizing data transmission, and enables timely vehicle control and driver notification, improving safety by accurately identifying slippery or hazardous road conditions.
Implementation Method 1
a vibration detection unit configured to output a detection signal corresponding to a magnitude of vibration of the tire
Data Source
AI summary
A tire side device is provided with a vibration detection unit that outputs a detection signal corresponding to the magnitude of tire vibration, a control unit that performs to generate road surface data indicating a road surface condition that appears in the waveform of the detection signal, and a first data communication unit that transmits the road surface data. Furthermore, a vehicle body side system is provided with a second data communication unit that receives the road surface data transmitted from the first data communication unit, and a road surface determination unit that determines the condition of the road surface that the vehicle is traveling on the basis of the road surface data. In addition, sensing is performed by the control unit under different sensing conditions at the tire side device of at least one tire among a plurality of tires and the tire side device of at least one other tire among the plurality of tires, and road surface data generated on the basis of the different sensing conditions is transmitted from the first data communication unit.