Arm Hydraulic Regeneration Control With Selective Valve Blocking
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Solution Overview
Problem
The existing hydraulic systems for work machines require high dimensional accuracy and complex manufacturing and assembly due to the need for precise control of oil flow through multiple direction switching valves to achieve high operation speed and controllability during excavating operations, complicating the manufacturing and assembly processes.
Innovation Solution
A hydraulic system with a controller that manages the operation of the arm second direction switching valve, allowing oil to flow only through the arm first direction switching valve during regeneration, eliminating the need to consider variations between the two valves and simplifying manufacturing and assembly by reducing the complexity of oil flow management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If two direction switching valves are used to supply oil from two hydraulic pumps to the arm hydraulic cylinder, then the operation speed of the arm can be increased, but the manufacturing and assembly work become significantly complicated due to high dimensional accuracy requirements and variations between valves
Solution Approach 1:
The invention extracts the second direction switching valve from the oil supply path during regeneration operations. By using a control valve to block the connection between the second direction switching valve and the arm hydraulic cylinder, the system eliminates the need for the second valve to participate in regeneration, thereby reducing manufacturing and assembly complexity while maintaining high-speed operation capability when both pumps are used together
Solution Approach 2:
The system dynamically switches between different operational modes: during regeneration, only the first direction switching valve is active while the second is blocked; during high-speed operations, both valves are activated. This dynamic configuration allows the system to adapt to different operational requirements, maintaining simplicity when needed and providing enhanced performance when required
2Productivity
If two direction switching valves are used to supply oil from two hydraulic pumps to the arm hydraulic cylinder, then the flow rate of oil supplied to the arm hydraulic cylinder per unit time increases, but high dimensional accuracy is required for processing of each valve and variations due to combination must be eliminated
Solution Approach 1:
The invention removes the second direction switching valve from the active circuit during regeneration operations by blocking its connection to the arm hydraulic cylinder. This extraction reduces the number of precision components that must work together during regeneration, thereby reducing the cumulative tolerance requirements and manufacturing precision demands while preserving the ability to use both valves for high-flow operations when needed
3Loss of energy
If oil flow through the arm regeneration passage is blocked during regeneration, then fuel efficiency can be improved by reducing discharge flow rate from the hydraulic pump, but controllability of the arm must be maintained
Solution Approach 1:
The invention introduces a control valve as an intermediary component that manages the blocking of the second direction switching valve during regeneration. This control valve enables the system to block oil flow through the second direction switching valve while maintaining controllability through the first direction switching valve, thereby improving fuel efficiency during regeneration without sacrificing operational control
Solution Approach 2:
The system uses feedback from the regeneration detection mechanism to control the blocking action. When regeneration is detected (when pressure in the rod chamber exceeds pressure in the bottom chamber), the control valve automatically blocks the second direction switching valve, reducing energy consumption while maintaining system controllability through the first valve
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
This solution simplifies manufacturing and assembly by eliminating the need to account for variations between the arm first and second direction switching valves, facilitating easier control of the arm hydraulic cylinder and improving fuel efficiency by reducing discharge flow rates during regeneration.
Implementation Method 1
the arm first direction switching valve incorporates an arm regeneration passage capable of supplying oil discharged from a rod chamber of the arm hydraulic cylinder to a bottom chamber of the arm hydraulic cylinder when the arm hydraulic cylinder is extended and operated
Implementation Method 2
the controller monitors a pressure state of the arm hydraulic cylinder, and when determining that oil flow through the arm regeneration passage is possible, the controller blocks oil flow between the arm hydraulic cylinder and the arm second direction switching valve
Data Source
AI summary
A hydraulic system includes: an arm hydraulic cylinder; a first hydraulic pump and a second hydraulic pump; an arm first direction switching valve; an arm second direction switching valve; and a controller that controls an operation of the arm second direction switching valve when the arm hydraulic cylinder is extended and operated. Further, the arm first direction switching valve incorporates an arm regeneration passage capable of supplying oil when the arm hydraulic cylinder is extended and operated, and the controller monitors a pressure state of the arm hydraulic cylinder, and when determining that oil flow through the arm regeneration passage is possible, the controller blocks oil flow between the arm hydraulic cylinder and the arm second direction switching valve, and otherwise, the controller operates the arm second direction switching valve so that oil can be supplied from the second hydraulic pump to the bottom chamber.