TPMS Pressure Sensor Identification by Signal Power and Position
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Solution Overview
Problem
In vehicles with twinned wheels or in environments with multiple sensors close together, it is challenging to differentiate and identify pressure sensors accurately due to simultaneous activation and proximity issues, leading to difficulties in pairing sensors with the onboard computer.
Innovation Solution
A method involving the emission of a sensor activation signal, reception and processing of signals from multiple sensors, attenuation and amplification of these signals, determination of signal power values, and identification of sensor spatial positions based on these power values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are activated sequentially in a predetermined order, then the onboard computer can identify and associate sensors with each wheel, but simultaneous activation of multiple sensors may occur unintentionally, making it impossible to determine which sensor is activated
Solution Approach 1:
The patent introduces a spatial dimension to sensor identification by using the relative positions of sensors in twinned wheels. Instead of relying solely on sequential activation timing, the system determines which sensor is activated based on the spatial relationship between the learning device and the two sensors. The sensor closer to the learning device is identified as the activated one, adding a spatial dimension to resolve the ambiguity of simultaneous activation.
2Measurement precision
If complex encoding and identification techniques are used to differentiate sensor emissions, then sensor identification accuracy improves, but device complexity and cost increase
Solution Approach 1:
The patent changes the parameter used for sensor identification from complex encoding schemes to simple geometric parameters. Specifically, it uses the relative positions and distances between the learning device and sensors, along with signal power levels, to identify which sensor is activated. This parameter change from encoding complexity to spatial-geometric parameters simplifies the device while maintaining identification accuracy.
3Area of stationary object
If sensors are housed very close together in twinned wheels, then space utilization improves, but the ability to differentiate between sensor emissions deteriorates
Solution Approach 1:
The patent applies local quality by considering the specific spatial relationship between the learning device and each sensor. Instead of treating all sensors uniformly, the system determines which sensor is activated based on the local geometric configuration - specifically, which sensor is closer to the learning device. This local spatial information allows differentiation even when sensors are housed very close together in twinned wheels.
Data Source
AI summary
A method and device for identifying pressure sensors of a tire pressure monitoring system (TPMS) of a motor vehicle. The method includes emission of a sensor activation signal, receiving of signals from at least two different sensors following activation, attenuation and amplification of the signals received, determination of a value indicative of the power of the signals received, and identification of the spatial position of at least one sensor on the basis of values indicative of the power of the signal received. A device configured as a TPMS tool is used for implementing the method.