Directional Auto-Braking Control for Work Machine Travel
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Solution Overview
Problem
Existing automatic braking systems in work machines like wheel loaders can cause malfunctions by exerting braking force in unintended travel directions, hindering work operations.
Innovation Solution
A work machine equipped with a travel direction detecting system, object detecting system, braking system, and control system that allows automatic braking only in a desired travel direction by controlling the braking force based on the detected travel direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic braking is implemented to detect objects and brake the vehicle body, then collision prevention is improved, but work efficiency deteriorates due to unintended braking in wrong travel directions
Solution Approach 1:
The system dynamically controls braking force based on travel direction detection. When the vehicle travels in the first (intended) direction, automatic braking is enabled for collision prevention. When traveling in the second (unintended) direction, braking force is restricted or suppressed. This dynamic approach prevents collisions when appropriate while maintaining work efficiency by avoiding unintended braking that would hinder operational productivity.
Solution Approach 2:
The control section changes the operational parameter of the braking section based on detected travel direction. The braking force parameter is set to active level when travel direction indicates intended movement, ensuring collision prevention. When travel direction indicates unintended movement, the braking parameter is changed to restricted or inactive level, preventing work efficiency deterioration from unnecessary braking interruptions.
2Speed
If the braking force is always available for automatic braking, then safety response is improved, but malfunction risk increases due to braking in unintended directions
Solution Approach 1:
The braking system transitions from a static always-available state to a dynamic conditionally-available state. The braking section responds quickly when travel direction detection confirms intended direction (first direction), maintaining fast braking response for safety. When travel direction indicates unintended movement (second direction), the system dynamically restricts braking force, preventing malfunction risk while preserving rapid response capability when appropriate.
Data Source
AI summary
A work machine includes a vehicle body, a travel direction detecting section that detects a travel direction of the vehicle body, an object detecting section that detects an object in a predetermined direction of the vehicle body, a braking section, a setting section. and a control section. The braking section is able to implement automatic braking of the vehicle body and exert a braking force based on a detection of the object. The setting section sets the braking section so that the automatic braking force can be or cannot be exerted. The control section controls the setting section to set the braking section so that the braking force can be exerted when the vehicle body is traveling in the predetermined direction, and to set the braking section so that the braking force cannot be exerted when the vehicle body is traveling in a direction other than the predetermined direction.