Adaptive Braking Control for Working Machine Safety
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Solution Overview
Problem
Existing working machines with a single lever function for releasing the brake and driving the power source struggle to perform intermittent operation modes, making it difficult to ensure operator safety and control rotational speed effectively.
Innovation Solution
A working machine with an operating device, driving device, braking device, detection device, and change device that detects operation modes and adjusts brake control accordingly, allowing for emergency stops and free running, ensuring safety through adaptive braking based on operation duration thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single lever performs functions from releasing the brake to driving the power source, then the operations of the operator are facilitated, but it becomes difficult to perform intermittent operation modes and ensure operator safety
Solution Approach 1:
The operating device is divided into two separate components: a trigger switch for power source control and a brake lever for brake control. This segmentation allows each component to perform its specific function independently, enabling intermittent operation modes while maintaining operator safety through dedicated brake control.
Solution Approach 2:
The control unit acts as an intermediary that receives signals from both the trigger switch and brake lever, processes the operation mode information, and coordinates the brake control and power source driving accordingly. This mediator enables complex control logic for different operation modes without complicating the physical operation interface.
2Reliability
If the brake is applied immediately when the trigger switch is turned off, then operator safety is ensured in case of unexpected conditions, but intermittent operation modes cannot be performed
Solution Approach 1:
The brake control is made dynamic by adjusting the brake force based on the detected operation mode. In continuous operation mode, immediate strong braking is applied when the trigger switch is turned off. In intermittent operation mode, the brake force is reduced or delayed to allow speed control through repeated on-off operations. This dynamic adaptation resolves the contradiction between safety and operational flexibility.
Solution Approach 2:
The brake control parameters (brake force magnitude and application timing) are changed based on the operation mode detected by the control unit. The system transitions between different brake control strategies: strong immediate braking for continuous mode and weak delayed braking for intermittent mode, enabling both safety and operational versatility.
3Reliability
If normal brake control with strong braking force is applied during intermittent operation, then operator safety is ensured, but the rotational speed control through repeated on-off operations is disrupted
Solution Approach 1:
Instead of applying full strong braking force during intermittent operation, the system applies a reduced brake force that is sufficient to provide some deceleration but not enough to completely stop the working tool. This partial braking action allows the operator to control rotational speed through repeated on-off operations while maintaining a baseline safety level.
Data Source
AI summary
A working machine according to one aspect of the present disclosure comprises an operating device, a working tool, a driving device, a braking device, a detection device, and a change device. The detection device detects a mode of an operation performed on the operating device. The change device changes a brake control to be performed by the braking device according to the mode detected by the detection device.