Construction Machinery Hydraulic Control System Swing Priority
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Solution Overview
Problem
Construction machinery faces challenges in efficiently performing simultaneous swing and boom raising operations while ensuring independence of swing operations, as existing systems lack efficient control mechanisms to prioritize swing operations without compromising boom operation power.
Innovation Solution
A control system for construction machinery that includes first and second hydraulic pumps, swing and boom control valves, a shutoff valve, and a control unit to electronically control the shutoff valve, allowing for prioritization of swing operations by shifting the boom control valve to a neutral position when swing priority is selected, thereby securing independence of swing operations and optimizing hydraulic fluid distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydraulic fluid is distributed to both swing and boom actuators simultaneously, then both operations can be performed together, but swing operation independence is compromised
Solution Approach 1:
The control system performs preliminary assessment of operation requests before executing hydraulic fluid distribution. When a swing operation is detected, the system preemptively prioritizes hydraulic fluid to the swing actuator, ensuring swing operation independence is maintained even when boom operations are simultaneously requested
Solution Approach 2:
The hydraulic fluid distribution system dynamically adjusts allocation based on real-time operation priorities. The control unit continuously monitors operation requests and modifies hydraulic fluid distribution in real-time, allowing the system to switch between simultaneous operation mode and swing-priority mode as conditions change
2Reliability
If a separate main hydraulic pump is provided for swing operation, then swing operation independence is secured, but system complexity and cost increase
Solution Approach 1:
The control system enables the main hydraulic pump to serve multiple functions by dynamically allocating hydraulic fluid to different actuators based on operation priorities. The same pump can prioritize swing operations when needed while also supporting boom operations, eliminating the need for dedicated swing pumps
Solution Approach 2:
The control unit acts as an intermediary that manages hydraulic fluid distribution between competing actuators. It receives operation requests, determines priorities, and controls the distribution of hydraulic fluid accordingly, enabling swing operation independence without requiring separate hardware pumps
3Reliability
If hydraulic fluid is blocked to boom cylinder for swing priority, then swing operation independence is enhanced, but boom operation power is reduced
Solution Approach 1:
The system dynamically controls hydraulic fluid flow to the boom cylinder based on real-time swing operation status. When swing operations are detected, the control unit reduces or blocks hydraulic fluid to the boom cylinder temporarily; when swing operations complete, normal boom power is restored, allowing adaptive power management
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 system enables efficient simultaneous operation of swing and boom raising, prioritizes swing operations by blocking hydraulic fluid to the boom cylinder, and saves expenses by using all hydraulic pumps for swing operation, ensuring independence and enhanced operational efficiency.
Implementation Method 1
a shutoff valve installed in a control line through which a boom raising pilot signal pressure for raising a boom of the boom cylinder is supplied to the first boom control valve and configured to selectively open and close the control line
Implementation Method 2
Construction machinery may use a hydraulic fluid to drive actuators such as a boom, a cylinder, a bucket, a travelling motor, a swing motor, etc.
Data Source
AI summary
A control system for construction machinery includes first and second hydraulic pumps connected to an engine, a swing control valve and a first boom control valve installed in a first center bypass line connected to the first hydraulic pump, a second boom control valve installed in a second center bypass line connected to the second hydraulic pump, a shutoff valve installed in a control line through which a boom raising pilot signal pressure is supplied to the first boom control valve and configured to selectively open and close the control line, and a control unit configured to electronically control the shutoff valve according to a manipulation signal, wherein the control unit closes the shutoff valve such that the first boom control valve is shifted to a neutral position when a swing operation priority mode is selected.