Tire Pressure Monitoring via Dynamic Radius Analysis

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Solution Overview

Problem

Current tire pressure monitoring systems (TPMS) face challenges in accurately detecting low tire pressure due to variations in wheel speed, leading to potential false alarms and reduced accuracy, especially in dynamic driving conditions.

Innovation Solution

A tire pressure monitoring apparatus and method that calculates regression equations based on radius analysis values, using relative speed differences and average speeds from wheel speeds, to correct and determine low tire pressure, incorporating additional mass and torque or yaw rate compensation to enhance accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If indirect TPMS uses wheel speed sensors to estimate tire pressure, then cost is reduced and maintenance is simplified, but measurement precision deteriorates due to wheel speed variations causing false alarms

Engineering Contradiction:

ImprovecostVSAvoidtire pressure detection accuracy

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The patent changes the measurement parameter from direct wheel speed to dynamic loaded radius, which is calculated by integrating wheel speed data over distance. This parameter transformation allows the system to maintain the simplicity of indirect TPMS while improving measurement precision by compensating for wheel speed variations through cumulative distance measurement.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces dynamic loaded radius as an intermediary parameter between wheel speed measurement and tire pressure determination. Instead of directly using wheel speed to detect pressure changes, the system first converts wheel speed data into dynamic loaded radius values, which then serve as the basis for accurate pressure detection, thereby eliminating false alarms caused by speed variations.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If indirect TPMS estimates pressure from wheel speed changes, then additional hardware is eliminated, but reliability decreases due to false alarms in dynamic driving conditions

Engineering Contradiction:

Improvehardware componentsVSAvoidlow pressure determination accuracy

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent performs preliminary conversion of wheel speed data into dynamic loaded radius values before using them for pressure detection. By pre-processing the wheel speed data through integration and calibration, the system prepares accurate baseline values that compensate for normal driving condition variations, thereby improving reliability without adding hardware.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamic calibration by continuously updating the dynamic loaded radius values based on actual driving conditions. The system adapts to changing vehicle loads and driving patterns by recalibrating the baseline radius values, maintaining high reliability in dynamic environments without requiring additional hardware components.

Inventive Principle:

Principle #15Dynamics

3Ease of manufacture

If radius analysis is used to detect tire pressure, then direct contact sensors are eliminated, but accuracy deteriorates due to variations in wheel speed affecting the analysis

Engineering Contradiction:

Improvesensor installationVSAvoidpressure measurement accuracy

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The patent replaces the mechanical direct contact measurement system with an indirect computational system. Instead of using physical sensors that contact the tire, the system substitutes a computational model that calculates dynamic loaded radius from wheel speed data, thereby eliminating sensor installation while maintaining measurement accuracy through mathematical transformation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent creates a virtual copy of the tire radius measurement through computational modeling. By calculating the dynamic loaded radius as a virtual representation of the actual physical radius, the system replicates the measurement function of direct sensors without requiring physical contact, thus eliminating installation complexity while preserving accuracy.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS10414218B2Apparatus and method for monitoring tire pressure using radius analysis

Publication Date: 2019.09.17 HYUNDAI AUTOEVER

AI summary

The present invention relates to an apparatus for monitoring a tire pressure. Provided is a tire pressure monitoring apparatus including: a radius analyzing unit which calculates a radius analysis value using a relative speed difference and an average speed calculated from wheel speeds of the wheels mounted on the vehicle; a regression equation calculating unit which calculates a first regression equation for the calculated radius analysis value and first driving information and a second regression equation for the calculated radius analysis value and second driving information; a mass calculating unit which calculates an additional mass of the vehicle; a calibration unit which corrects the calculated radius analysis value using a combination of the calculated first and second regression equations and the calculated additional mass; and a low pressure determining unit which determines a low pressure of a tire mounted on the vehicle using the corrected radius analysis value.