Tire Mount Position Detection Using Dual Receiver Signal Strength
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Solution Overview
Problem
Existing tire pressure monitoring systems require additional sensors to detect wheel positions, increasing costs and failure rates, and are affected by variations in radio signal transmission power.
Innovation Solution
A tire mount position detection system using a receiver unit with two receivers positioned differently to measure signal intensity differences and totals, allowing automatic detection of wheel positions based on signal intensity patterns without the need for additional sensors to detect rotation direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If an additional sensor is added to detect rotation direction for automatic wheel position detection, then automatic detection capability is improved, but system cost and failure rate increase
Solution Approach 1:
The existing sensor in the tire serves dual functions: monitoring tire pressure/temperature and detecting wheel position through radio signal transmission. The receiver unit processes signals to determine both tire status and rotational position, eliminating the need for separate detection sensors.
Solution Approach 2:
The patent combines the wheel position detection function with the existing tire monitoring sensor system. The transmitter in the tire and receiver unit work together as an integrated system that simultaneously performs tire parameter monitoring and position detection without requiring additional sensors.
2Extent of automation
If an additional sensor is added to detect rotation direction for automatic wheel position detection, then automatic detection capability is improved, but system complexity and cost increase
Solution Approach 1:
The existing sensor in the tire serves dual functions: monitoring tire pressure/temperature and detecting wheel position through radio signal transmission. The receiver unit processes signals to determine both tire status and rotational position, eliminating the need for separate detection sensors.
3Ease of manufacture
If radio signal transmission power varies due to individual performance differences, then manufacturing flexibility is improved, but measurement precision deteriorates
Solution Approach 1:
The receiver unit measures the actual received signal intensity from the transmitter and uses this feedback information to calculate and compensate for transmission power variations. By comparing expected versus actual signal strengths, the system adjusts position detection calculations to maintain precision despite manufacturing tolerances.
Solution Approach 2:
The system dynamically adjusts detection parameters based on measured signal intensity. When transmission power varies, the receiver modifies its calculation parameters to account for the actual signal strength, ensuring accurate position detection regardless of transmitter power differences between individual sensors.
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
Enables precise and cost-effective automatic detection of wheel positions using only the receiving state of radio signals, reducing system complexity and failure rates, and accounting for variations in transmission power.
Implementation Method 1
a sensor including a transmitter of a radio signal (radio wave) is mounted in the tire
Implementation Method 2
a first measurement portion that measures first signal intensity (R1(x)), which is intensity of the radio signal received by the first receiver
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The tire mount position detection system measures a first signal intensity, which is intensity of a radio signal received by a first receiver (R1), and a second signal intensity, which is intensity of a radio signal received by a second receiver (R2), for each transmitter, and calculates a difference of the first signal intensity and the second signal intensity and a total value of the first signal intensity and the second signal intensity for each transmitter. The tire mount position detection system detects the wheel position to which a tire having the transmitter is mounted, based on the difference and the total value of each transmitter.