Dual-Valve Hydraulic Actuator Control for Speed and Precision
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Solution Overview
Problem
Agricultural and work vehicles require hydraulic systems that can switch between rapid actuation and high control resolution modes, but existing systems use separate valves for each, leading to inefficiencies and increased costs due to valves being sized for maximum flowrates needed for individual modes of operation.
Innovation Solution
A hydraulic actuator control system that includes a controller to manage two control valves, each sized to provide less than the maximum required flowrate, allowing them to combine for the desired flowrate and control resolution, with a processor executing instructions to adjust valve operation based on the mode of operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single control valve is sized to provide maximum required flowrate for rapid actuation, then rapid actuation is achieved, but control resolution deteriorates
Solution Approach 1:
The control valve is divided into two separate control valves: a first control valve sized for rapid actuation with lower control resolution, and a second control valve sized for precise control with higher control resolution. The controller selectively activates each valve based on the operational mode required, thereby resolving the contradiction between speed and precision by spatially separating their functions.
Solution Approach 2:
The system dynamically switches between using the first control valve for rapid actuation and the second control valve for precise control based on real-time operational requirements. The controller adjusts which valve is active according to the task at hand, making the system adaptable rather than static, thus resolving the speed-resolution tradeoff.
2Adaptability or versatility
If two separate control valves are used to provide both rapid actuation and high control resolution, then both performance requirements are met, but device complexity increases
Solution Approach 1:
The first and second control valves are merged into a single integrated control assembly with shared mounting, fluid connections, and control electronics. The controller统一管理 both valves and selects which one to activate based on operational mode, thereby reducing overall system complexity while maintaining the versatility of having both rapid actuation and precise control capabilities.
3Adaptability or versatility
If two control valves are used to provide both rapid actuation and high control resolution, then performance requirements are met, but system cost increases
Solution Approach 1:
The control valve assembly is designed as a universal unit that can perform both rapid actuation and precise control functions by selectively activating either the first or second control valve. This multi-functional design eliminates the need for separate valve assemblies for different modes, thereby reducing manufacturing costs while maintaining adaptability across operational requirements.
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
Enables efficient and cost-effective operation by reducing the overall size and cost of the hydraulic system while providing the necessary flowrate and control resolution for different tasks, allowing vehicles to switch seamlessly between modes without the need for oversized valves.
Implementation Method 1
A pump moves a hydraulic fluid to actuate an actuator
Data Source
AI summary
A hydraulic actuator control system that includes an actuator. A pump pumps a hydraulic fluid to move the actuator. A first control valve fluidly couples to the pump. The first control valve provides a first hydraulic fluid flow to the actuator. A maximum first hydraulic fluid flow through the first control valve is less than a maximum required hydraulic fluid flow of the actuator. A second control valve fluidly couples to the pump. The second control valve provides a second hydraulic fluid flow to the actuator. A maximum second hydraulic fluid flow through the second control valve is less than the maximum required hydraulic fluid flow of the actuator. A controller controls the first control valve and the second control valve to provide the hydraulic fluid to the actuator.