Wheel Loader See-Through Display for Bucket View Obstruction

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Solution Overview

Problem

The existing control systems for wheel loaders hinder the operator's field of view due to the work implement, leading to reduced work efficiency and difficulty in intuitive operation.

Innovation Solution

A control system that synthesizes a perspective image of the work implement with a contour line on the display, allowing the operator to intuitively operate the implement by showing the blocked region beyond the work implement's obstruction, using optically transparent displays and image processing to enhance visibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the work implement is positioned in front of the wheel loader for excavation and loading operations, then the work implement can perform excavation and loading functions, but the work implement blocks the operator's field of view

Engineering Contradiction:
Improvework efficiencyVSAvoidfield of view
Core Design Contradiction:
ProductivityVSEase of operation

Solution Approach 1:

The patent creates a virtual copy of the work implement's visual appearance and superimposes it on the display screen. This virtual image allows the operator to see through the work implement link and bucket by displaying the background scene that would otherwise be blocked, while the actual work implement remains in its functional position for performing excavation and loading operations.

Inventive Principle:
Principle #26Copying

Solution Approach 2:

The display screen acts as an intermediary between the operator and the blocked field of view. By showing a captured image of the background scene (taken by a camera positioned to view the area behind the work implement) and superimposing it with the work implement's visual appearance, the display mediates the operator's visibility without requiring physical changes to the work implement's position.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Loss of information

If cameras are arranged around the wheel loader to capture images for monitoring, then surrounding areas can be monitored, but the images do not match the operator's field of view perspective

Engineering Contradiction:
Improvesurroundings monitoringVSAvoidintuitive operation
Core Design Contradiction:
Loss of informationVSEase of operation

Solution Approach 1:

The patent applies local quality by capturing an image specifically from the camera position that corresponds to the operator's field of view perspective. The captured image is then processed to show only the relevant background area that the operator would see, rather than providing a complete 360-degree view. This localized approach ensures the displayed information matches the operator's natural viewing perspective.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

Instead of showing images from multiple camera positions and requiring the operator to mentally reconstruct the scene, the patent inverts the approach by directly capturing and displaying the specific background view that corresponds to the operator's perspective. The work implement's visual appearance is then overlaid on this pre-aligned background image, eliminating the need for perspective transformation.

Inventive Principle:
Principle #13The other way round (Inversion)

Data Source

PatentEP3985184B1Control system for wheel loader and control method thereof
Publication Date: 2025.10.29 KOMATSU LTD
  • EP3985184B1 patent drawingFigure 1
  • EP3985184B1 patent drawingFigure 2
  • EP3985184B1 patent drawingFigure 3

AI summary

A control system for a work vehicle with a vehicular main body and a work implement having a bucket and a work implement link connecting the bucket and the vehicular main body to each other includes a display and a control unit which has the display show a perspective image in which at least a part of the work implement link is seen through.