Tire Position Determination Using Axle Rotation and Gravity
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Solution Overview
Problem
Existing tire position determination systems require additional components like initiators for automatic locating, increasing costs and complexity, and may inaccurately determine tire positions due to vibrations and rotations.
Innovation Solution
A tire position determination system that uses acceleration detectors to generate gravitational information and axle rotation amount detectors to determine tire positions without initiators, by comparing rotation angles from axle and gravitational information acquired during vehicle stops, ensuring accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If initiators are arranged in each wheel well to enable automatic locating function, then tire position determination is enabled, but the number of components increases and component cost rises
Solution Approach 1:
The patent extracts and eliminates the initiator components from the wheel wells, replacing them with existing vehicle body structures that have detection sensors. This removes the need for separate initiator devices while maintaining the automatic locating function through gravitational information detection from the vehicle body itself.
Solution Approach 2:
The vehicle body is given multiple functions: it serves as both the structural support and the detection platform for gravitational information. The existing vehicle body structures are utilized to detect tire positions without requiring dedicated initiator components, thereby reducing overall system complexity.
2Measurement precision
If initiators are used for automatic locating, then tire position can be determined, but component cost increases
Solution Approach 1:
The patent removes the expensive initiator components and replaces them with cost-effective vehicle body structures equipped with gravitational sensors. This extraction of unnecessary components directly reduces manufacturing costs while preserving the core functionality.
Solution Approach 2:
The vehicle body serves itself by using its own structure as the detection platform. Instead of requiring external initiator components, the vehicle body's natural gravitational response to tire positions is detected by integrated sensors, eliminating the need for additional expensive parts.
3Productivity
If gravitational information and axle rotation data are collected during vehicle movement, then tire position can be determined, but measurement accuracy decreases due to vibrations and rotations
Solution Approach 1:
The system collects gravitational information and axle rotation data during vehicle movement in advance, before the vehicle comes to a complete stop. This preliminary data collection allows the system to process and determine tire positions during the transition period, maintaining productivity without waiting for complete vehicle stagnation.
Solution Approach 2:
The system continuously monitors gravitational information and axle rotation data, using feedback from these measurements to compensate for vibrations and rotations. By processing the relationship between gravitational vectors and axle rotation, the system can filter out noise from vehicle movement and maintain measurement accuracy dynamically.
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
This solution reduces component costs and improves accuracy by eliminating the need for initiators and accurately determining tire positions through precise analysis of axle and gravitational data, even in conditions of vehicle vibration.
Implementation Method 1
An acceleration detector generates gravitational information for each tire pressure detector
Data Source
AI summary
A tire position determination system includes a tire pressure detector attached to each tire to generate a tire pressure signal. An acceleration detector generates gravitational information for each tire pressure detector. A receiver arranged in a vehicle body receives the tire pressure signal from each tire pressure detector. An axle rotation amount detector detects an axle rotation amount of an axle corresponding to each tire and generates pulses indicative of the detected axle rotation amount. An automatic locator determines the position of each tire based on the gravitational force and the pulses. A pulse combination determination unit determines whether or not a combination of the pulses from the axle rotation amount detectors is appropriate. A pulse acquisition timing setting unit sets an acquisition timing of the pulse signal for the automatic locator based on the determination of the pulse combination determination unit.