Tire Mounting Position Detection via Dual-Receiver Signal Ratios
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Solution Overview
Problem
Existing tire mounting position detection systems require additional sensors to detect the rotational direction of tires, increasing costs and system failure rates, and are affected by variations in radio signal transmission power and receiver sensitivity, making accurate detection challenging, especially when signal dispersion or reception sensitivity is low.
Innovation Solution
A tire mounting position detection system using a receiving unit with a first and second receiver positioned differently in the vehicle's longitudinal and width directions, measuring signal strengths and calculating a strength ratio to automatically detect tire positions based on the reception state of radio signals from transmitters, without the need for additional sensors to detect rotational direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional sensors are added to detect rotational direction, then tire mounting position detection accuracy is improved, but system complexity and cost increase
Solution Approach 1:
The patent extracts the rotational direction detection function from a separate sensor and integrates it into the existing transmitter. The transmitter now emits not only radio signals for identification but also signals containing rotational direction information, thereby eliminating the need for additional sensors while maintaining detection accuracy.
Solution Approach 2:
The transmitter is designed to perform multiple functions: it identifies the tire, detects rotational direction, and transmits this information to the receiver. By making the transmitter multi-functional, the system achieves accurate mounting position detection without adding separate rotational direction sensors.
2Measurement precision
If additional sensors are added to detect rotational direction, then tire mounting position detection accuracy is improved, but system failure rate increases
Solution Approach 1:
The patent removes the need for additional rotational direction sensors by extracting this detection capability into the existing transmitter. This reduction in component count directly lowers the system failure rate while maintaining the ability to accurately detect tire mounting positions.
3Device complexity
If signal strength variation is not compensated, then system simplicity is maintained, but detection accuracy deteriorates
Solution Approach 1:
The patent changes the parameter being measured from absolute signal strength to signal strength ratio. By calculating the ratio between signals received at different antennas, the system compensates for transmission power variations and receiver sensitivity differences, improving detection accuracy without significantly increasing system complexity.
Solution Approach 2:
The system uses feedback from multiple receiving antennas to determine the optimal signal strength ratio. This feedback mechanism allows the system to adapt to signal variations and accurately identify tire mounting positions even when transmission power or receiver sensitivity changes.
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 accurate and cost-effective automatic detection of tire positions by canceling out variations in signal strength and sensitivity, reducing system complexity and failure rates, and maintaining accuracy even with low transmission power dispersion or reception sensitivity.
Implementation Method 1
a sensor in the tire including a transmitter of a radio signal (radio wave) is widely provided
Implementation Method 2
a receiving unit (Receiving Unit 105) disposed in the vehicle and for receiving a radio signal transmitted from the transmitter
Data Source
AI summary
A tire mounting position detection system measures a first signal strength which is the strength of a radio signal received by a first receiver (R1) for each transmitter, measures a second signal strength which is the strength of the radio signal received by a second receiver (R2) for each transmitter, and calculates an strength ratio which is a ratio using the first signal strength and the second signal strength for each transmitter. The tire mounting position detection system detects a wheel position where a tire equipped with a transmitter is mounted on the basis of the first signal strength, the second signal strength and a strength ratio for each transmitter.