Tire Vibration Sensor Power Management via Periodic Activation
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Solution Overview
Problem
Conventional road surface condition determining devices face challenges in efficiently detecting and transmitting vibration data from tires due to limited battery power and the need for frequent data communication, which affects the accuracy and reliability of road surface condition assessment.
Innovation Solution
A road surface condition determining device comprising a tire side device with a vibration detection unit, waveform processing unit, and data transmission unit, and a vehicle body side system that receives and processes road surface data to determine the condition, incorporating a power-saving activation and sleep control mechanism for the tire side device to extend battery life.
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 condition determination accuracy is improved, but the battery power is consumed rapidly
Solution Approach 1:
The tire side device alternates between active and sleep states, performing vibration detection and data transmission periodically rather than continuously. The control unit activates the vibration detection unit and data transmission unit only when needed, then puts them into sleep mode to conserve battery power, achieving periodic operation that balances measurement accuracy with energy conservation
Solution Approach 2:
The control unit determines the optimal timing for activating the vibration detection unit based on predicted road surface condition changes or vehicle operation states. By performing preliminary assessment and activating the sensor only when road surface condition determination is actually needed, the system avoids unnecessary power consumption while maintaining determination accuracy
2Reliability
If the vibration detection unit and data transmission unit are always active, then the road surface data transmission reliability is improved, but the battery life is shortened
Solution Approach 1:
The data transmission unit transmits road surface data periodically rather than continuously, activating only when new road surface condition information is obtained or when transmission is critically needed. This periodic transmission maintains data reliability while significantly reducing power consumption to extend battery life
Solution Approach 2:
The control unit extracts and transmits only the essential road surface condition information that is most critical for vehicle control, rather than transmitting all raw vibration data continuously. By extracting only the necessary data elements, the system maintains transmission reliability while reducing communication power consumption
3Measurement precision
If the tire side device processes and transmits detailed vibration waveforms, then the road surface condition analysis accuracy is improved, but the data transmission power consumption increases
Solution Approach 1:
The control unit extracts only the essential characteristic parameters from the vibration waveform that are most indicative of road surface conditions, such as dominant frequency components or vibration amplitude metrics. By transmitting these extracted features rather than the complete raw waveform data, the system maintains analysis accuracy while dramatically reducing data transmission volume and associated power consumption
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 accurate and efficient determination of road surface conditions, reducing power consumption and extending battery life by selectively activating and sleeping tire side devices, thereby improving the reliability of road surface data transmission and vehicle control systems.
Implementation Method 1
a vibration detection unit for outputting a detection signal corresponding to a magnitude of vibration of the tire
Data Source
AI summary
In a road surface condition determining device, when determining a road surface condition, a vibration detection unit, a waveform processing unit and a data transmission unit for implementing a sensing function and a data transmission function are not set continuously to an active state for all tire side device, but at least only one tire side device is set to an active state. Remaining one or more is set to a sleep state. A reduction in power consumption of the tire side devices set to the sleep state can thus be achieved. Further, with regard to the at least one tire side device, since the sensing function and the data transmission function remain in the active state, the road surface condition can be reliably determined based on the road surface data of the tire side device.