Agricultural Hydraulic Priority Valves Under Limited Pump Flow
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Solution Overview
Problem
Existing hydraulic systems for agricultural equipment face challenges in prioritizing hydraulic fluid supply effectively between different subsystems, leading to inefficiencies and performance issues.
Innovation Solution
The implementation of a priority valve system within hydraulic circuits that includes a spool movable between open and closed positions based on pressure differences, allowing selective restriction of hydraulic fluid delivery to lower priority subsystems to ensure adequate supply to higher priority subsystems, optimized through compensator and flow control valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic fluid is supplied to multiple subsystems simultaneously, then all subsystems can operate, but higher priority subsystems may not receive adequate fluid supply when demand exceeds available capacity
Solution Approach 1:
The hydraulic system is segmented into multiple priority levels using priority valves that divide fluid demand into hierarchical groups. Higher priority subsystems (e.g., steering) receive guaranteed fluid supply while lower priority subsystems (e.g., implement control) receive fluid only when higher priority demands are satisfied. This segmentation ensures reliable fluid distribution according to operational criticality.
Solution Approach 2:
The priority valve dynamically changes the flow parameter (fluid delivery quantity) to lower priority subsystems based on the operational state of higher priority subsystems. When higher priority subsystems require maximum fluid flow, the priority valve reduces or restricts flow to lower priority subsystems, thereby ensuring adequate supply to critical functions while maintaining overall system productivity.
2Reliability
If hydraulic fluid delivery to lower priority subsystems is restricted, then higher priority subsystems receive adequate fluid supply, but lower priority subsystems experience reduced performance
Solution Approach 1:
The priority valve provides dynamic fluid delivery adjustment rather than static restriction. It continuously monitors the operational state of higher priority subsystems and automatically modulates fluid flow to lower priority subsystems in real-time. This dynamic control ensures that lower priority subsystems receive adequate fluid when not conflicting with higher priority demands, maintaining their operational performance while ensuring higher priority functions always have sufficient supply.
3Reliability
If existing hydraulic circuit components are used for prioritizing fluid supply, then fluid prioritization can be achieved, but the system complexity and drawbacks increase
Solution Approach 1:
The priority valve acts as an intermediary component inserted between the hydraulic pump and lower priority subsystems. It mediates fluid distribution by selectively allowing or restricting flow based on priority requirements, rather than requiring complex reconfiguration of existing circuit components. This intermediary approach achieves reliable fluid prioritization with minimal additional complexity, as the priority valve integrates seamlessly into the existing hydraulic architecture.
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 enables efficient hydraulic fluid management, optimizing performance by ensuring higher priority subsystems receive necessary fluid while minimizing fluid consumption in lower priority subsystems, thereby enhancing overall system efficiency and stability.
Implementation Method 1
a spool movable between an open position, in which the inlet and the outlet are fluidly coupled to one another to permit delivery of hydraulic fluid from the delivery control valve to the first fluid demand device, and a closed position, in which the inlet and the outlet are fluidly de-coupled from another to resist delivery of hydraulic fluid from the delivery control valve to the first fluid demand device
Data Source
AI summary
Agricultural implements and hydraulic circuits for agricultural implements are disclosed herein. An agricultural implement includes a fluid source, a plurality of fluid demand devices, a delivery control valve, and a priority valve. The fluid source is configured to supply hydraulic fluid. The plurality of fluid demand devices are each configured to receive hydraulic fluid supplied by the fluid source during operation of the agricultural implement. The delivery control valve is fluidly coupled between the fluid source and a first fluid demand device. The delivery control valve is configured to selectively deliver hydraulic fluid supplied by the fluid source to the first fluid demand device during operation of the agricultural implement. The priority valve is fluidly coupled between the delivery control valve and the first fluid demand device.