Work Machine Brake Retention Control During Active Implement Operation
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Solution Overview
Problem
Existing automatic brake retention systems in work machines, such as motor graders, hinder work operations when activated during slow travel speeds.
Innovation Solution
A controller for a work machine that performs automatic brake retention control only when the vehicle is stationary and disables the function during work operations, using sensors and switches to determine the state of the work implement and operator inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic brake retention function is implemented in work machine, then braking force is retained to maintain travel-stopped state, but work operations are hindered when traveling at slow speed
Solution Approach 1:
The brake retention control system dynamically adjusts its behavior based on work implement status. When work is detected, the system switches from automatic brake retention to disabled state, allowing free movement during work operations. When no work is detected, the system enables automatic brake retention for safety. This dynamic switching resolves the contradiction by adapting the brake control mode to current operational requirements.
Solution Approach 2:
The system changes the operational parameter of brake retention control based on detected work conditions. The controller monitors work implement status and adjusts the brake retention parameter accordingly - enabling it during non-work periods and disabling it during work periods. This parameter change allows the system to maintain safety during travel while ensuring operational freedom during work activities.
2Ease of operation
If automatic brake retention control is enabled, then operator fatigue is reduced through automated braking, but work performance is disrupted due to restricted slow-speed travel
Solution Approach 1:
The system dynamically switches between automatic brake retention mode and disabled mode based on real-time detection of work implement operation. During work activities, the system disables brake retention to allow smooth slow-speed travel necessary for work performance. During non-work periods, it enables automatic brake retention to reduce operator fatigue during normal travel operations.
Solution Approach 2:
The controller continuously monitors the status of the work implement through feedback signals and adjusts the brake retention control accordingly. When feedback indicates work implement operation, the system disables brake retention. When feedback shows idle state, the system enables brake retention. This feedback mechanism ensures the system automatically adapts to operational needs without operator intervention.
Data Source
AI summary
A work machine is provided that can achieve an automatic brake retention function without hindering work. The work machine includes a vehicular body that travels, a work implement supported on the vehicular body, an accelerator operation device operated to increase a traveling speed of the vehicular body, a brake operation device operated to decrease the traveling speed of the vehicular body, and a controller. The controller performs automatic brake retention control to retain a braking force to maintain a travel-stopped state of the vehicular body when the traveling speed of the vehicular body becomes less than or equal to a threshold by operation of the brake operation device, and release the retention of the braking force by operation of the accelerator operation device. The controller determines whether work is being performed by the work implement, and when work is being performed, disables the automatic brake retention control.