Tire Pressure Sensor Wheel Position Determination
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Solution Overview
Problem
Conventional tire air pressure monitoring devices struggle to accurately determine the wheel position of a transmitter when the rotation speeds of the four tires differ, especially during cornering, wheel locking, or slipping, leading to inaccuracies in determining the wheel position.
Innovation Solution
The device accumulates rotation position data from multiple transmissions of a wireless signal with identification information and determines the wheel position corresponding to the data with the smallest dispersion, ensuring a constant transmission position for accurate wheel position determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the wheel position is determined based on a single rotation position detection, then the determination process is simple and fast, but the accuracy deteriorates when rotation speeds of four tires differ
Solution Approach 1:
The system performs preliminary action by accumulating multiple rotation position detections before making the final wheel position determination. Instead of determining position from a single detection, the device collects rotation position data multiple times and selects the most frequent value, thereby improving accuracy while managing complexity through a systematic selection process.
2Measurement precision
If the transmitter transmits wireless signals at varying rotation positions, then the device can adapt to different transmission conditions, but the wheel position determination accuracy deteriorates
Solution Approach 1:
The system applies feedback by comparing multiple rotation position detections and selecting the value that appears most frequently. This feedback mechanism allows the device to identify the consistent transmission position even when transmissions occur at varying positions, thereby maintaining determination accuracy while preserving adaptability to different transmission conditions.
3Measurement precision
If multiple rotation position data are accumulated and processed, then the wheel position determination accuracy improves, but the processing time increases
Solution Approach 1:
The system applies partial action by accumulating a specific number of rotation position detections (e.g., 10 times) rather than continuously collecting data indefinitely. This approach achieves sufficient accuracy improvement while limiting the processing time and computational load, balancing precision gains with time efficiency.
Data Source
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AI summary
A tire air pressure monitor device provided for monitoring the air pressure in tires is provided with a pressure sensor 2a installed in the tire of each of the wheels 1 for detecting the air pressure in the tire; a transmitter 2d provided on each of the wheels 1 for transmitting by wireless signals the air pressure information along with a sensor ID when at a predetermined rotation position; a receiver 3 provided on the vehicle body for receiving the wireless signals; a wheel speed sensor 8 provided on the vehicle body to correspond to each of the wheels 1 for determining the rotation position of the wheel 1; and a TPMSCU 4 for acquiring the rotation position of the wheels ten or more times when a wireless signal containing a certain sensor ID is transmitted, accumulating the same as rotation position data for the wheels 1, and determining the wheel position corresponding to the rotation position data having the smallest degree of dispersion from among each of the rotation position data as the wheel position for the transmitter 2d corresponding to the sensor ID.