Hydraulic Shovel Control for Mode-Based Acceleration Response
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Solution Overview
Problem
Conventional shovels lack the ability to control acceleration/deceleration characteristics based on work modes, leading to inconsistent responsiveness and operator fatigue, especially when transitioning between modes like SP and A modes.
Innovation Solution
A shovel with a control device that adjusts the acceleration/deceleration characteristics of the hydraulic actuator based on the selected work mode, utilizing a hydraulic pump, hydraulic actuator, and an operating device, with a control system that modifies the bleed valve and proportional valve settings to match the desired mode's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the engine speed is changed to switch between work modes (SP mode and A mode), then the maximum operating speed is adjusted, but the acceleration/deceleration characteristics remain the same, causing inconsistent responsiveness
Solution Approach 1:
The patent applies dynamics by making the acceleration/deceleration characteristics adjustable according to different work modes. The control device dynamically changes the acceleration/deceleration characteristics based on the selected mode (SP mode for high speed, A mode for low speed), ensuring that the shovel's responsiveness adapts to the operator's intentions for each specific work scenario.
2Use of energy by moving object
If the shovel operates in A mode with low engine speed for fuel efficiency and safety, then fuel consumption is reduced, but the acceleration/deceleration characteristics remain rapid as in SP mode, causing the shovel to move too quickly for precise work
Solution Approach 1:
The patent applies parameter changes by modifying both the engine speed parameter and the acceleration/deceleration characteristics parameter according to the selected work mode. When A mode is selected, the control device reduces both the engine speed (for fuel efficiency) and the acceleration/deceleration characteristics (for controlled movement), ensuring that the shovel moves at an appropriately slow speed matching the operator's intention for precise and safe work.
3Productivity
If the shovel operates in SP mode with high engine speed for maximum work output, then productivity is increased, but the rapid acceleration/deceleration characteristics cause difficulty in controlling the shovel for precise operations
Solution Approach 1:
The patent applies dynamics by enabling the acceleration/deceleration characteristics to be dynamically adjusted based on the work mode. When SP mode is selected for high productivity, the control device configures the acceleration/deceleration characteristics to match the high-speed operation, and when A mode is selected for precise work, it adjusts the characteristics to provide smoother, more controlled movement, thus resolving the controllability issue while maintaining productivity benefits.
Data Source
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AI summary
A shovel according to an embodiment of the present invention includes a lower traveling body, an upper turning body pivotally mounted on the lower traveling body, a hydraulic pump mounted on the upper turning body, a hydraulic actuator driven by hydraulic oil discharged from the hydraulic pump, an operating device used to operate the actuator, and a control device configured to control an acceleration/deceleration characteristic of the hydraulic actuator in response to an operation of the operating device depending on a work mode.