Electric Working Machine Tip Tool Type Determination
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Solution Overview
Problem
Existing electric working machines, such as those described in Japanese Patent No. 6137467, face challenges in accurately determining the type of attached tip tools, leading to potential loss of workability and usability issues like sluggish startup.
Innovation Solution
The electric working machine incorporates a controller with first and second start control modes, where the motor is started and controlled with specific parameters to determine the type of tip tool, using detection parameters like motor current to accurately identify the tool type, thereby improving determination accuracy and preventing usability deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the motor is started and controlled with the first parameter to determine tip tool type, then determination accuracy is improved, but startup performance deteriorates (sluggish startup)
Solution Approach 1:
The system performs tip tool type determination during an initial startup phase before normal operation begins. The controller executes the first start control with first parameters only during this preliminary period, allowing accurate measurement without affecting subsequent operational performance. This resolves the contradiction by confining the measurement-action to a preliminary phase.
Solution Approach 2:
The controller dynamically switches between first parameters (for determination) and second parameters (for normal operation) based on whether tip type information has been obtained. The system adapts its control parameters in real-time: using first parameters during initial startup when tip type is unknown, and transitioning to second parameters once determination is complete, thus eliminating sluggish startup in normal operation.
2Measurement precision
If the first start control is executed continuously to determine tip tool type, then determination accuracy is maintained, but workability is reduced due to sluggish startup
Solution Approach 1:
The tip tool type determination is performed as a preliminary action during initial startup only. Once the determination is complete and tip type information is stored, the system transitions to normal operation mode. This ensures determination accuracy is achieved when needed without continuously executing the first start control that causes sluggish startup, thereby preserving workability during actual tasks.
Solution Approach 2:
The system discards the first start control mode after successful tip type determination and recovers normal operational efficiency by switching to the second start control with second parameters. The determination function is discarded after completion, allowing the system to operate efficiently without the performance penalty of continuous determination attempts.
3Measurement precision
If the motor is controlled with different parameters for determination and normal operation, then determination accuracy improves, but control complexity increases
Solution Approach 1:
The controller serves multiple functions: it acts as both a determination device (using first parameters) and a normal operation device (using second parameters). By integrating both determination and operational control capabilities into a single controller with conditional parameter switching, the system avoids the complexity of separate dedicated devices while maintaining high determination accuracy through appropriate parameter selection based on operational context.
Data Source
AI summary
An electric working machine includes an attachment portion, a motor, and a controller. Multiple types of tip tools are alternatively attached to the attachment portion. The motor drives the tip tool attached to the attachment portion. The controller has first start control and second start control. The controller is configured to execute the first start control so as to determine the type of the tip tool when not having tool type information, and configured to execute the second start control when having the tool type information.