Engine Controller Rotation Speed Limitation Cancellation
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Solution Overview
Problem
Existing engine-driven working machines require a long time to transition from fast idling to stable idling after the throttle valve is closed, leading to prolonged rotation speed limitation mode cancellation, which can hinder machine operation if the operator cannot wait.
Innovation Solution
The controller cancels the rotation speed limitation mode by detecting a longer cycle period of rotation speed variations after the throttle valve is closed, using criteria such as increased or decreased peak times, or reduced frequency of speed changes, to determine when the engine has transitioned to idling, thereby shortening the cancellation time while maintaining safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the controller maintains rotation speed limitation mode until the engine reaches stable idling state, then safety is ensured, but the time required for mode cancellation is excessively long
Solution Approach 1:
The controller performs preliminary assessment of engine stability by monitoring rotation speed variations and detecting when they fall below predetermined thresholds. This preliminary detection allows the controller to cancel the rotation speed limitation mode before the engine fully reaches stable idling, thereby reducing cancellation time while maintaining safety through continuous monitoring of engine state
Solution Approach 2:
The controller continuously monitors rotation speed variations and uses this feedback to determine when to cancel the rotation speed limitation mode. By detecting when rotation speed variations fall below predetermined thresholds, the controller can make real-time decisions about mode cancellation, balancing safety requirements with time efficiency
2Ease of operation
If the throttle valve is moved to fully-opened position to operate the machine, then machine operation is enabled, but the rotation speed limitation mode remains active preventing clutch operation
Solution Approach 1:
The controller performs preliminary detection of engine stability by monitoring rotation speed variations. When variations fall below predetermined thresholds, the controller proactively cancels the rotation speed limitation mode in advance, enabling the centrifugal clutch to operate when the operator moves the throttle to fully-opened position, thus eliminating the barrier to machine operation
Solution Approach 2:
The controller dynamically adjusts the rotation speed limitation mode based on real-time engine state. By continuously monitoring rotation speed variations and adapting the mode cancellation timing accordingly, the system ensures that the clutch can operate when needed while maintaining safety during transient states
Data Source
Figure 1
Figure 2
Figure 3(a)~3(c)
AI summary
An engine-driven working machine is provided, in which a time period until the rotation speed limitation mode is canceled can be shortened. After the throttle valve (10) is moved to a fully-closed position by an operator's operation to allow the engine (2) to finish the fast idling state and while the engine (2) is transited to an idling state, the controller (18) cancels the rotation speed limitation mode by detecting an event that a cycle period of rotation speed variations of the engine (2) is longer than a cycle period of rotation speed variation in the fast idling state.