Moving Vehicle In-Position Determination via Stop Position Estimation

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Solution Overview

Problem

Existing moving vehicle systems face issues with overshoot, where a vehicle may move out of the in-position range after determining it is within the range, due to instability in position and velocity, leading to incorrect operation of secondary axes.

Innovation Solution

A moving vehicle system that uses sensors to determine the current position, velocity, and acceleration, and a computation unit to estimate the stop position, allowing for accurate in-position determination by checking if both the current and estimated stop positions are within the in-position range, thereby preventing overshoot.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If simple in-position determination is used to check whether current position is within range, then the determination process is simple and fast, but overshoot occurs due to vibrations causing the vehicle to move out of the in-position range after determination

Engineering Contradiction:

Improvedetermination speedVSAvoidpositioning accuracy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system performs preliminary estimation of the stop position using current position, velocity, and acceleration data before the vehicle actually stops. This allows the system to predict whether the vehicle will remain within the in-position range, preventing overshoot issues while maintaining fast determination speed.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses sensor feedback to continuously monitor position, velocity, and acceleration, and incorporates this real-time data into the stop position estimation. This feedback mechanism enables accurate prediction of the stop position while maintaining rapid determination capability.

Inventive Principle:

Principle #23Feedback

2Device complexity

If in-position determination is made based only on current position without considering stop position, then the determination process is simple, but it becomes necessary to cancel determination in the middle of operation when overshoot occurs

Engineering Contradiction:

Improvedetermination process complexityVSAvoidoperation continuity

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

3Reliability

If detailed analysis of position and velocity stability is performed to prevent overshoot, then positioning accuracy is improved, but the determination process becomes more complex and time-consuming

Engineering Contradiction:

Improvepositioning accuracyVSAvoiddetermination speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system replaces complex mechanical monitoring and analysis systems with a computational approach. By using simple mathematical calculations based on sensor data (position, velocity, acceleration) to estimate stop position, the system achieves high positioning accuracy without increasing device complexity or reducing determination speed.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS8560197B2Moving vehicle system and in-position determination method for moving vehicle

Publication Date: 2013.10.15 MURATA MASCH LTD

AI summary

A moving vehicle system for making an in-position determination when a moving vehicle enters an in-position range, includes a sensor arranged to determine a position, a velocity, and an acceleration of the moving vehicle, and computation unit arranged to determine whether a stop position of the moving vehicle is within an in-position range or not.