Tire State Detection Angle Correction for Wheel Positioning

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Solution Overview

Problem

The existing tire state detecting devices face challenges in accurately and efficiently specifying the position of wheels due to intermittent acquisition of gravitational acceleration values, leading to shifts in transmission signal angles and increased time required for wheel position specification.

Innovation Solution

A tire state detecting device with a rotation position detecting unit, an acceleration sensor, and a calculating unit that corrects the acquiring angle using a correction formula based on acceleration differences, allowing for precise transmission signal timing and reduced time to specify wheel positions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the tire state detecting device intermittently acquires the gravitational acceleration value to reduce power consumption, then the power consumption of the battery is reduced, but the time required to specify the wheel position becomes long due to angle shifts in transmission signals

Engineering Contradiction:

Improvepower consumptionVSAvoidtime required to specify wheel position

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The correction formula is pre-calculated and stored in the storage unit based on the relationship between acceleration differences and angle shifts. When a transmission signal is sent, the receiver uses this pre-stored formula to immediately correct the wheel position without requiring time-consuming real-time calculations or additional measurements, thus resolving the time loss caused by intermittent acquisition

Inventive Principle:

Principle #10Preliminary action

2Use of energy by moving object

If the transmission signal is transmitted based on intermittently acquired gravitational acceleration values, then the power consumption is reduced, but the angle determined in advance shifts due to acquiring frequency variations

Engineering Contradiction:

Improvepower consumptionVSAvoidangle determination accuracy

Core Design Contradiction:

Use of energy by moving objectVSMeasurement precision

Solution Approach 1:

The system uses the acceleration difference as feedback to determine the angle shift. The receiver calculates the difference between the current acceleration value and the previous one, uses this feedback to determine the angular deviation from the predetermined angle, and applies the correction formula to compensate for the shift, thereby maintaining angle determination accuracy despite intermittent acquisition

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system changes the parameter used for angle determination from direct gravitational acceleration values to acceleration differences. This parameter transformation makes the measurement less sensitive to intermittent acquisition timing variations, as the difference between consecutive measurements captures the angular shift information that can then be corrected using the stored formula

Inventive Principle:

Principle #35Parameter changes

3Duration of action of stationary object

If the gravitational acceleration value is acquired intermittently, then the battery life is extended, but the rotation position specification accuracy deteriorates due to angle shifts

Engineering Contradiction:

Improvebattery lifeVSAvoidrotation position specification accuracy

Core Design Contradiction:

Duration of action of stationary objectVSMeasurement precision

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

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

The solution reduces the time required to specify the wheel position by correcting the acquiring angle to a predetermined angle, minimizing variations in rotation positions and enhancing the accuracy of wheel position identification.

Implementation Method 1

an acceleration sensor that rotates integrally with the wheel and detects a gravitational acceleration value

Methodology Applied

Scientific EffectGravitation: Gravitation

Data Source

PatentUS10464380B2Tire state detecting device and wheel position specifying device

Publication Date: 2019.11.05 PACIFIC INDUSTRIAL CO LTD

AI summary

The tire state detecting device includes a calculating unit that calculates an acceleration difference of the gravitational acceleration value acquired at a first acquiring angle and the gravitational acceleration value acquired at a second acquiring angle; a storage unit that stores a correction formula defined in advance based on an angular difference between the adjacent acquiring angles and an angular difference of the first acquiring angle and the second acquiring angle, and corrects the first acquiring angle to an angle determined in advance from the acceleration difference; a transmission unit that transmits a transmission signal including information indicating the angle determined in advance in addition to information indicating the state of the tire; and a control unit that causes the transmission signal to be transmitted to a wheel position specifying device.