Dual Hydraulic Pump Control for Boom and Swing Priority
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Solution Overview
Problem
Conventional construction machines face limitations in the degree of freedom for extending the boom cylinder and swinging the swing body due to fixed horsepower ratios and mechanical constraints, particularly when simultaneous operations are performed.
Innovation Solution
A construction machine with a dual pump system, including a first pump for the swing motor and a second pump for the boom cylinder, allows for selectable boom or swing priority operations, with a control part adjusting the performance of the non-selected pump to optimize horsepower distribution and response, enabling greater freedom in boom extension and swing speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed horsepower ratio is used between swing pump and boom pump, then the mechanical characteristics are simplified, but the degree of freedom in changing swing speed and boom height is reduced
Solution Approach 1:
The patent implements dynamic horsepower ratio adjustment between swing pump and boom pump based on operational priority selection. The control system dynamically changes the horsepower distribution ratio according to whether swing priority or boom priority is selected, allowing the system to adapt to different operational requirements rather than using a fixed ratio.
Solution Approach 2:
The patent changes the horsepower ratio parameter between swing pump and boom pump based on operational mode. When swing priority is selected, one horsepower ratio is applied; when boom priority is selected, a different horsepower ratio is applied. This parameter change enables flexible control of swing speed and boom height independently.
2Speed
If swing priority operation is selected, then swing speed is improved, but boom lifting height is suppressed during combined operations
Solution Approach 1:
The patent applies different horsepower ratio allocations to different operational priorities. When swing priority is selected, the swing pump receives higher horsepower allocation for faster swing speed. When boom priority is selected, the boom pump receives higher horsepower allocation for greater lifting height. This local quality differentiation resolves the contradiction by allowing optimal performance for the selected priority.
Solution Approach 2:
The system dynamically switches horsepower distribution based on operational priority selection. The control system monitors the selected priority (swing or boom) and dynamically adjusts the horsepower ratio between pumps, enabling the system to optimize for swing speed when needed and boom height when needed, rather than being constrained by a fixed allocation.
3Length of moving object
If boom priority operation is selected, then boom lifting performance is improved, but swing speed is reduced during combined operations
Solution Approach 1:
The patent implements different horsepower ratio allocations for different operational priorities. When boom priority is selected, the boom pump is allocated higher horsepower ratio to achieve greater lifting height and better boom performance. When swing priority is selected, the swing pump receives higher allocation. This localized optimization for each priority resolves the contradiction.
4Productivity
If simultaneous swing and boom operations are performed with fixed horsepower ratio, then system simplicity is maintained, but operational efficiency is reduced
Solution Approach 1:
The patent implements dynamic horsepower ratio adjustment between swing and boom pumps based on operational priority selection. The control system monitors which priority is selected (swing or boom) and dynamically changes the horsepower distribution ratio accordingly, enabling optimized performance for simultaneous operations rather than being constrained by a fixed ratio.
Solution Approach 2:
The system changes the horsepower ratio parameter between swing pump and boom pump based on the selected operational priority. This parameter change enables the system to optimize horsepower allocation for simultaneous operations, improving productivity by allowing faster swing and/or higher boom lifting depending on the selected priority.
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
The solution enhances the efficiency of loading operations by allowing longer boom extension and smoother swing movements, improving the height adjustment range and swing speed compared to conventional machines.
Implementation Method 1
a first pump, which supplies hydraulic oil to the swing motor
Implementation Method 2
a second pump, which supplies the hydraulic oil to the boom cylinder
Implementation Method 3
The construction machine is operated by controlling the flow, volume, and pressure of the hydraulic oil
Data Source
AI summary
An embodiment of the present invention relates to a construction machine. The construction machine, including a swing motor, a boom cylinder, and an arm cylinder, comprises: a main pump part including a first pump, which supplies hydraulic oil to the swing motor, and a second pump, which supplies the hydraulic oil to the boom cylinder and/or the arm cylinder; a manipulation part through which a boom priority operation or a rotation priority operation is selected so that either the first pump or the second pump is operated at the maximum value of a stored horsepower ratio; and a control part for controlling the performance of the other pump not selected by the manipulation part from among the first pump and the second pump.