Load-Sensing System with Variable Orifice for Hydraulic Control
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Solution Overview
Problem
Hydraulic control systems, such as steering systems, require human reaction to compensate for load variations, leading to reduced operator security and productivity due to inconsistent performance across different load conditions.
Innovation Solution
A load-sensing system operable in both static and dynamic modes, featuring a load-sensing priority valve with a variable orifice that adjusts based on flow conditions to maintain consistent performance and reduce energy losses, by dynamically boosting the load sense signal during high-flow conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a lower control pressure is used to reduce energy losses, then energy efficiency is improved, but system responsiveness deteriorates under high-flow conditions
Solution Approach 1:
The system dynamically switches between static and dynamic load-sense modes based on flow conditions. The priority valve transitions from a fixed orifice configuration to a variable orifice configuration that adapts to flow demands, allowing the system to maintain responsiveness when needed while minimizing energy consumption during normal operation
Solution Approach 2:
The system changes the control pressure parameter based on operating conditions. During high-flow conditions, the dynamic mode increases control pressure to maintain responsiveness, while during low-flow conditions, the static mode uses lower control pressure to reduce energy losses
2Speed
If a higher control pressure is used to improve system responsiveness under high-flow conditions, then system responsiveness is improved, but energy losses increase
Solution Approach 1:
The system applies high control pressure periodically or conditionally only when high-flow conditions are detected, rather than maintaining high pressure continuously. The priority valve switches to dynamic mode temporarily during high-flow demands, then returns to static mode for energy-efficient operation
3Reliability
If load-sense systems maintain consistent performance across all load conditions, then system reliability is improved, but device complexity increases due to dual-mode operation
Solution Approach 1:
The patent combines the static load-sense mode and dynamic load-sense mode into a single integrated priority valve assembly. The static orifice and dynamic variable orifice are merged within the same valve body, allowing automatic mode transition without requiring separate systems
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 provides enhanced responsiveness and reduced energy losses by maintaining consistent performance across varying load conditions, improving operator security and productivity while minimizing energy consumption.
Implementation Method 1
A load-sensing system is disclosed which includes a dynamic load-sense orifice having a variable orifice area
Data Source
AI summary
The present disclosure relates to a load-sense system such as a load-sense steering system that operates in a static load-sense mode for low flows and operates in a dynamic load-sense mode for high flows.