Working Machine Idle Speed Control for Energy Saving
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Solution Overview
Problem
Existing electric working machines waste energy when the working device is not in use, leading to decreased efficiency.
Innovation Solution
A controller reduces the rotational speed of the rotary drive source to a reduced speed when the working device is idle for a threshold period, gradually lowering it to an idling speed, and resumes the original speed upon operator input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the rotary drive source maintains a set rotational speed even when the working device is not actuated, then the working machine can respond quickly when the working device needs to be actuated again, but energy is wasted and work efficiency decreases
Solution Approach 1:
The rotational speed of the rotary drive source is made dynamic rather than static. The controller automatically adjusts the rotational speed based on the actuated state of the working device: maintaining set rotational speed when actuated, and reducing to reduced rotational speed or idling rotational speed when not actuated. This dynamic speed adjustment resolves the contradiction by adapting the speed to actual operational needs.
Solution Approach 2:
The working machine performs self-service by automatically detecting whether the working device is actuated and autonomously adjusting the rotational speed of the rotary drive source without requiring manual intervention. The controller monitors the actuated state and self-regulates the speed, eliminating the need for continuous manual control while optimizing energy consumption.
2Use of energy by moving object
If the rotational speed is reduced to conserve energy, then energy efficiency improves, but the response time when work is needed increases
Solution Approach 1:
The system dynamically adjusts rotational speed based on real-time detection of the working device state. When the working device transitions from non-actuated to actuated state, the controller immediately responds by adjusting the rotational speed accordingly. This dynamic response mechanism ensures that energy efficiency is maintained during idle periods while response time is minimized when work is actually needed.
Solution Approach 2:
The controller implements feedback control by continuously monitoring the actuated state of the working device and using this information to adjust the rotational speed of the rotary drive source. The feedback loop detects changes in the working state and automatically adjusts speed parameters, ensuring both energy efficiency during idle periods and rapid response when work is required.
Data Source
AI summary
A working machine includes a machine body, a rotary drive source, a hydraulic device to be actuated by power generated by the rotary drive source, a working device to be actuated by a hydraulic of hydraulic fluid from the hydraulic device, a work detector to detect whether the working device is actuated, and a controller configured or programmed to, when an elapsed time period which starts when the working device enters a non-actuated state reaches a first threshold, reduce a rotational speed of the rotary drive source to a reduced rotational speed obtained by subtracting a predetermined value from a set rotational speed at a time immediately before the elapsed time period reaches the first threshold or from an actual rotational speed, and, as the elapsed time period further increases from the first threshold, reduce the rotational speed to an idling rotational speed in a stepwise or continuous manner.