Wheel Position Detector Using Gear Tooth Variation Allowance
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Solution Overview
Problem
Existing wheel position detection methods for tire inflation pressure detectors require significant time and data to accurately specify wheel positions, as they rely on variation analysis and standard deviation, which delays the registration process.
Innovation Solution
A wheel position detector system that includes transmitters with acceleration sensors to detect gravity acceleration components and wheel speed sensors to acquire gear information, allowing for rapid and accurate wheel position detection by setting and adjusting variation allowances based on tooth positions, enabling quick identification of wheel positions without needing extensive data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wheel position is specified based on standard deviation and allowable variation range, then measurement precision is improved, but loss of time increases due to needing extensive data
Solution Approach 1:
The system performs preliminary actions by detecting tooth positions of gears before final wheel position determination. The gear detection provides initial positional information that narrows down candidate wheels, eliminating the need to collect extensive data for standard deviation analysis. This preliminary gear-based positioning enables rapid wheel identification while maintaining accuracy.
2Reliability
If standard deviation method is used for wheel position specification, then reliability is improved through statistical analysis, but productivity decreases due to data acquisition requirements
Solution Approach 1:
The detection process is segmented into two independent stages: first detecting gear tooth positions to identify candidate wheels, then determining final wheel positions using frame reception timing. This segmentation allows each stage to use optimized methods - gear detection for rapid candidate identification and timing analysis for precise final determination - thereby improving both reliability and productivity simultaneously.
3Measurement precision
If extensive data is collected for wheel position detection, then measurement precision is improved, but device complexity increases due to data processing requirements
Solution Approach 1:
The system extracts and utilizes gear tooth position information as a separate, independent data source that provides direct positional cues. By taking out this mechanical positioning information from the overall detection system, the patent eliminates the need for complex statistical processing of extensive frame data, thereby reducing device complexity while maintaining high measurement precision.
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 fast and accurate specification of wheel positions, reducing the time required for registration and improving the efficiency of tire inflation pressure detection.
Implementation Method 1
an acceleration sensor that outputs a detection signal corresponding to acceleration, which has a gravity acceleration component varying with a rotation of a respective wheel mounting the transmitter
Implementation Method 2
The gear of each wheel has an outer periphery, which provides teeth as conductive portions and a plurality of intermediate portions between the teeth so that conductive portions and the intermediate portions are alternately arranged along the outer periphery, and a magnetic resistance of tooth is different from a magnetic resistance of an intermediate portion
Data Source
AI summary
A wheel position detector for a vehicle includes: a transmitter at each wheel having a first controller for generating and repeatedly transmitting a frame with specific identification information and an acceleration sensor; a receiver at a vehicle body receiving the frame from one wheel and having a second controller for performing wheel position detection; and a wheel speed sensor for detecting a tooth of a gear. The second controller acquires gear information indicating a tooth position; sets a variation allowance based on the tooth position; registers the one wheel with using the variation allowance; sets another variation allowance based on another tooth position when the receiver receives a new frame; and changes the variation allowance to a new variation allowance provided by an overlap portion between the variation allowance and another variation allowance.