Portable Working Machine Tip Angle Detection and Engine Stop Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Portable working machines equipped with gaseous-fueled engines are prone to damage from falling, as existing technologies lack effective mechanisms to detect and respond to tilting or falling conditions during operation.
Innovation Solution
A portable working machine equipped with a gaseous-fueled engine, a working unit, and an acceleration sensor that detects horizontal accelerations to determine a tip angle, triggering a stop instruction for the engine when the angle exceeds a preset reference, with adjustable duration times and rotational speed control to manage tilting conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the portable working machine is placed on the floor without anchoring for ease of operation and transfer, then the ease of operation is improved, but the reliability deteriorates due to risk of falling
Solution Approach 1:
The acceleration sensor continuously monitors horizontal accelerations before falling occurs, and the control unit proactively stops the engine when tip angle exceeds the reference angle, preventing damage before it happens rather than reacting after falling occurs
Solution Approach 2:
The system uses real-time feedback from the acceleration sensor to monitor tip angle and dynamically controls engine operation, creating a closed-loop control system that adjusts engine state based on actual machine orientation
2Productivity
If the engine continues operating during tilting to maintain productivity, then the productivity is improved, but the risk of damage increases
Solution Approach 1:
The control unit applies preliminary anti-action by stopping the engine before significant damage can occur during falling, counteracting the harmful effect of continuous operation under dangerous conditions
3Reliability
If the tip angle threshold is set low for early detection, then the reliability is improved, but the productivity deteriorates due to frequent engine stops
Solution Approach 1:
The system dynamically adjusts the tip angle threshold based on operating conditions, using a reference angle that balances early detection with avoiding false stops during normal operation variations
Solution Approach 2:
The control unit dynamically determines when to stop the engine based on real-time acceleration data and current operating conditions, rather than using a fixed threshold, allowing flexible response to actual falling scenarios
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively prevents damage by promptly stopping the engine when the machine is about to fall, allowing for stable operation and minimizing damage through timely intervention based on detected tilting conditions.
Implementation Method 1
an acceleration sensor capable of detecting accelerations in two mutually perpendicular horizontal directions relative to a vertical line that are induced in the portable working machine
Data Source
AI summary
A portable working machine includes a gaseous-fueled engine, a working unit driven by the engine, a control unit for controlling the engine and the working unit, and an acceleration sensor capable of detecting accelerations in two mutually perpendicular horizontal directions relative to a vertical line, which is induced in the portable working machine. The control unit is configured to determine a tip angle of the portable working machine based on the horizontal accelerations detected by the acceleration sensor and issue a stop instruction to the engine when it determines that the tip angle exceeds a preset reference angle.