Tire-Side Road Condition Sensor Power Management
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Solution Overview
Problem
Existing road surface condition assessing devices face challenges in reducing power consumption, especially when the tire-side device is physically distant from the vehicle-body-side system, as data transmission for assessment consumes high power, and battery replacement is difficult.
Innovation Solution
A road surface condition assessing device with a tire-side device that includes a vibration detector, a controller for producing road surface data, and a transmission/reception unit for communication with a vehicle-body-side system, which uses a disconnection request signal to cut off connections when the vehicle is turned off, reducing power consumption by putting the tire-side device into a sleep state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the tire-side device continuously transmits data to the vehicle-body-side system, then the road surface condition assessment accuracy is improved, but the power consumption increases
Solution Approach 1:
The system transmits data periodically based on detection results rather than continuously. The tire-side device transmits road surface condition data to the vehicle-body-side system only when changes are detected, creating a periodic transmission pattern that reduces overall power consumption while maintaining assessment accuracy when needed.
Solution Approach 2:
The tire-side device autonomously determines when transmission is necessary based on its own detection results. The device monitors road surface conditions and independently decides to transmit data only when changes occur, eliminating the need for continuous polling or centralized control, thus reducing power consumption while maintaining assessment accuracy.
2Reliability
If the tire-side device maintains connection to the vehicle-body-side system, then the data transmission reliability is improved, but the power consumption increases
Solution Approach 1:
The connection between the tire-side device and vehicle-body-side system is maintained in a dormant state and activated periodically only when road surface condition changes are detected. This periodic activation maintains transmission reliability when needed while minimizing power consumption during normal operation.
Solution Approach 2:
The tire-side device autonomously manages connection states based on detection results. When road surface conditions change, the device automatically activates transmission; when conditions are stable, it enters a low-power state. This self-managed connection approach ensures reliability when necessary while reducing overall power consumption.
3Speed
If the tire-side device transmits data frequently, then the road surface condition monitoring responsiveness is improved, but the battery life decreases
Solution Approach 1:
The tire-side device autonomously monitors road surface conditions and independently determines when transmission is necessary. By using its own detection capabilities to trigger transmissions only when changes occur, the device maintains monitoring responsiveness without the need for frequent scheduled transmissions, thereby extending battery life.
Solution Approach 2:
The transmission frequency is dynamically adjusted based on road surface condition changes. When conditions are stable, transmission frequency is reduced to conserve battery; when changes are detected, transmission frequency increases to maintain responsiveness. This dynamic parameter adjustment balances battery life with monitoring responsiveness.
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
This solution effectively reduces power consumption by limiting data transmission to only when there are changes in road surface conditions and cutting off connections when the vehicle is turned off, thereby extending battery life and conserving energy.
Implementation Method 1
a vibration detector that outputs a detection signal corresponding to a magnitude of vibration of the tire
Data Source
AI summary
A road surface condition assessing device includes a tire-side device disposed in a tire and a vehicle-body-side system disposed on a vehicle body side. The tire-side device generates a detection signal corresponding to a magnitude of vibration of the tire, produces road surface data based on the detection signal, and performs data communication with the vehicle-body-side system. The vehicle-body-side system performs the data communication with the tire-side device and assesses a road surface condition based on the road surface data received from the tire-side device.