TPMS Sensor Multi-Range Calibration
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Solution Overview
Problem
Current tire pressure monitoring systems require different pressure sensors for passenger and heavy-duty vehicles, increasing manufacturing costs and complexity due to the need for separate calibrations for different tire pressure applications.
Innovation Solution
A method and system that calibrate a single tire pressure sensor to operate in multiple ranges, allowing it to adapt to different tire pressure conditions by selecting appropriate calibration data based on the pressure signal range, thereby enabling a single sensor to be used across various applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different pressure sensors are used for passenger vehicles and heavy-duty vehicles, then the pressure measurement tolerance required to meet regulatory requirements is maintained, but the overall cost to the manufacturer increases
Solution Approach 1:
The patent implements a single pressure sensor design that can serve multiple vehicle applications (passenger and heavy-duty vehicles) by incorporating multiple calibration data sets corresponding to different pressure ranges. The sensor system includes a memory device storing first calibration data for a first pressure range and second calibration data for a second pressure range, allowing the same physical sensor to be universally applied across different vehicle types while maintaining the required measurement tolerance for each application.
2Ease of manufacture
If a single pressure sensor is used for different applications, then the overall cost to the manufacturer is reduced, but the pressure measurement tolerance may not be maintained without proper calibration adjustment
Solution Approach 1:
The patent changes the calibration parameters of the pressure sensor based on the detected pressure range. The control unit selects between first calibration data and second calibration data depending on whether the pressure falls within the first or second range. This dynamic parameter adjustment allows a single sensor to maintain accurate measurements across different applications without requiring physical modification or replacement of the sensor hardware.
3Adaptability or versatility
If the pressure sensor range is not tailored to specific applications, then a single sensor can be used universally, but the resolution and accuracy of the sensor measurements decrease
Solution Approach 1:
The patent segments the pressure measurement range into distinct ranges (first pressure range and second pressure range), each with its own optimized calibration data. By dividing the overall pressure spectrum into segments and providing dedicated calibration data for each segment, the system achieves high measurement precision within each range while maintaining universal applicability across different vehicle types through the selection mechanism.
Data Source
AI summary
A tire pressure monitoring system (12) for a vehicle (10) has a pressure sensor circuit (16A) that includes an ECU (95), a transmitter/receiver (90), and pressure sensor (94). A method of operating a tire pressure monitoring system includes calibrating a tire pressure sensor circuit in a first range and a second range and generating a first calibration data for the first range and second calibration data for the second range. The first calibration data and the second calibration data are stored in a memory of the tire pressure sensing circuit (16A). A data signal corresponding to the pressure is generated. The first or second calibration data is generated in response to the range of the data signal to form a selected calibration. The data signal is calibrated with the selected calibration to form a pressure indicative signal. The pressure indicative signal is transmitted to a receiver (28) within the vehicle (10) with a range status corresponding to the selected calibration. A pressure signal is formed in response to the pressure indicative signal and the range status and the tire pressure monitoring system is operated with the pressure signal.