Tire Position Detection Using Dynamic Signal Frequency Switching
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Solution Overview
Problem
Existing tire pressure monitoring systems (TPMS) face challenges in determining tire positions efficiently due to high power consumption and long time periods required for localization, especially when the frequency of transmission is high or low.
Innovation Solution
A vehicle-mounted system that includes a tire detector attached to each tire, which switches the frequency of transmission from a first frequency to a second, higher frequency when the tire has rotated, allowing for quicker position determination while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the frequency of transmission of information on the angle of rotation is increased to shorten the time period for determination of tire positions, then the time period for determination is reduced, but power consumption by the wheel electronics unit increases
Solution Approach 1:
The transmission frequency is made dynamic rather than static. The wheel electronics unit adjusts the transmission frequency based on the rotational state of the tire: transmitting at a first (lower) frequency when the tire is stationary or rotating slowly, and switching to a second (higher) frequency when the tire rotation is detected. This dynamic adjustment resolves the contradiction by optimizing the balance between determination speed and power consumption according to actual operational conditions.
Solution Approach 2:
The transmission frequency parameter is changed based on the rotational state of the tire. The system monitors tire rotation and modifies the transmission frequency parameter accordingly - maintaining a lower frequency to conserve power during stationary conditions, and increasing the frequency to accelerate position determination when rotation occurs. This parameter change strategy directly addresses the technical contradiction.
2Use of energy by moving object
If the frequency of transmission is kept low to reduce power consumption, then power consumption is reduced, but it takes longer to collect information necessary for determination of tire positions
Solution Approach 1:
The system dynamically adjusts transmission frequency based on operational needs. During stationary conditions, it maintains low frequency to minimize power consumption. When tire rotation is detected, it automatically switches to high frequency to rapidly collect position determination data. This dynamic behavior resolves the contradiction between power consumption and determination time.
Solution Approach 2:
The system performs preliminary monitoring of tire rotation state and prepares to switch transmission frequency when rotation is detected. This preliminary detection mechanism ensures that when rotation occurs, the system can immediately increase transmission frequency to collect necessary position data quickly, thus preventing excessive determination time while maintaining low power consumption during non-rotating periods.
Data Source
AI summary
A vehicle-mounted system provided in a vehicle including a tire includes a detector attached to the tire, the detector transmitting a detection signal, and a monitoring unit that determines a position of the tire based on a plurality of detection signals received from the detector. The detector determines a direction of revolution of the tire, and when the detector determines that the direction of revolution of the tire has changed, it switches a frequency of transmission of the detection signal from a first frequency to a second frequency higher than the first frequency.