Enabling Valve with Segmented Flow Positions for Hydraulic Lift Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hydraulic control systems in power machines with lift arms often face challenges in controlling the flow of hydraulic fluid efficiently, particularly in situations where the lift arm needs to float over uneven terrain without power, as existing systems lack precise control over fluid evacuation rates.
Innovation Solution
A power conversion system with a control valve and an enabling valve that allows for selective flow control between the power source and hydraulic actuators, featuring multiple enabling positions to manage fluid flow rates, including a blocking position, an unrestricted position, and a restricted position, enabling precise control of the lift arm's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a control valve allows unrestricted flow for efficient operation, then productivity is improved, but control precision deteriorates when floating over terrain
Solution Approach 1:
The enabling valve is segmented into multiple positions (first enabling position, second enabling position, third enabling position) that provide different flow rates. This segmentation allows the system to switch between unrestricted flow for efficient operation and restricted flow for precise control during floating, resolving the contradiction between productivity and control precision.
2Device complexity
If a single valve position is used for all operations, then device complexity is reduced, but adaptability deteriorates for different operating conditions
Solution Approach 1:
The enabling valve is designed with multiple positions that serve different functions: first enabling position for unrestricted flow during powered operation, second enabling position for restricted flow during floating operations, and third enabling position for blocking flow. This multi-functionality allows a single valve to adapt to various operational conditions, enhancing versatility without significantly increasing device complexity.
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 allows for precise control of hydraulic fluid flow, enabling efficient operation of lift arms on power machines, including the ability to float over uneven terrain by managing flow rates, thereby enhancing operational flexibility and stability.
Implementation Method 1
the enabling valve is movable between a first enabling valve position in which flow between the control valve and the actuator is blocked, a second enabling valve position that allows substantially unrestricted flow between the control valve and the actuator, and a third enabling valve position that allows a restricted flow between the control valve and the actuator
Data Source
AI summary
Disclosed is a power conversion system for controlling the flow of a hydraulic power signal between a power source and a hydraulic actuator having first and second ports. The power conversion system includes a control valve that is configured to selectively expose each of the first and second ports to one of the power source and a low pressure reservoir. An enabling valve having a disabled position, a first enabled position, and a second enabled position receives an input from the control valve and provides an output to the hydraulic actuator.