Work Machine Center-of-Gravity Control After Component Replacement

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Solution Overview

Problem

Existing systems struggle to accurately calculate the center of gravity position of a work machine after replacement of constituent portions, such as the bucket or counterweight, which affects the assessment of overturning stability.

Innovation Solution

A system comprising a storage device, input device, and controller that stores and updates the center of gravity positions of constituent portions, allowing for accurate calculation of the entire work machine's center of gravity by inputting parameters via an input device, using conversion matrices to adjust for changes in dimensions and masses.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the center of gravity position is calculated using a concentrated mass point model with fixed constituent portions, then the calculation is simple, but the accuracy deteriorates when components are replaced

Engineering Contradiction:

Improvecalculation complexityVSAvoidcenter of gravity position accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The system dynamically updates the center of gravity position parameters based on actual component replacement information. When a component is replaced, the corresponding center of gravity position data is updated to reflect the new component's characteristics, making the calculation model adaptive rather than static.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the parameters (center of gravity positions) according to the specific components installed. Different components have different center of gravity positions, and the system selects and updates these parameters based on the actual configuration, allowing accurate calculation despite component variations.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If the center of gravity position parameters are fixed after manufacturing, then the system is simple to operate, but the reliability deteriorates when constituent portions are replaced

Engineering Contradiction:

Improveoperation simplicityVSAvoidoverturning stability assessment reliability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system incorporates feedback mechanisms where component replacement information is detected and fed back to update the center of gravity position parameters. This ensures the calculation model remains synchronized with the actual machine configuration, maintaining reliability without complicating operation.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system automatically updates the center of gravity position parameters based on component replacement information, reducing the need for manual intervention. The machine itself manages the parameter updates, maintaining reliability while keeping operations simple.

Inventive Principle:

Principle #25Self-service

3Ease of manufacture

If standard center of gravity positions are used for all components, then the manufacturing process is simple, but the adaptability deteriorates when different specifications are installed

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidcomponent replacement adaptability

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The system uses different parameter sets (center of gravity positions) corresponding to different component specifications. When components are replaced with different specifications, the system switches to the appropriate parameter set, enabling adaptability while maintaining manufacturing simplicity through standardized parameter management.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system creates a universal parameter management framework that can handle multiple component types and specifications. By storing and selecting appropriate center of gravity position parameters for different components, the system achieves multi-functionality without complicating the manufacturing process.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12584290B2System for controlling work machine, method, and work machine

Publication Date: 2026.03.24 KOMATSU LTD

AI summary

A work machine includes a plurality of constituent portions including a first portion. A system for the work machine includes a storage device, an input device, and a controller. The storage device stores center of gravity positions of the plurality of constituent portions. The input device receives input of a first parameter for determining the center of gravity position of the first portion. The controller calculates a center of gravity position of the entire work machine based on the center of gravity positions of the plurality of constituent portions. The controller sets the center of gravity position of the first portion by using the first parameter when the first parameter is inputted with the input device. The controller sets the center of gravity position of the entire work machine based on the center of gravity positions of the plurality of constituent portions that include the set center of gravity position of the first portion.