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 mode, leading to inefficiencies and increased costs due to valves being sized for maximum flowrates needed for each mode independently.
Innovation Solution
A hydraulic actuator control system that includes a controller to manage two control valves, each providing less than the maximum required flowrate individually, but together providing the desired flowrate, allowing for mode-dependent control resolution adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single control valve is used to control hydraulic fluid flow, then the system structure is simple, but the system cannot provide both rapid actuation and high control resolution simultaneously
Solution Approach 1:
The hydraulic control system is segmented into multiple control valves (first control valve and second control valve), each responsible for different flow rate ranges. The first control valve handles high flow rates for rapid actuation, while the second control valve handles low flow rates for precise control. This segmentation allows the system to achieve both rapid actuation and high control resolution without requiring a single complex valve.
Solution Approach 2:
The controller is designed to universally control multiple control valves based on the required actuation mode. The controller receives operator input and automatically selects which valve(s) to activate, making the system adaptable to different operational requirements (rapid actuation vs. precise control) without requiring separate control systems for each mode.
2Adaptability or versatility
If two separate control valves are used to provide rapid actuation and high control resolution, then both actuation modes are achieved, but the system cost increases due to valves being sized for maximum flowrates independently
Solution Approach 1:
The control system dynamically selects which valve(s) to use based on the required flow rate and actuation mode. The controller monitors system requirements and activates only the necessary valve(s), allowing smaller, more cost-effective valves to be used instead of two full-size valves that would be required if both operated independently at maximum capacity.
Solution Approach 2:
The system changes operational parameters by switching between different valve configurations. The controller adjusts which valve is active based on flow rate requirements, enabling the use of valves sized for specific flow ranges rather than maximum system flowrate, thereby reducing overall system cost while maintaining performance.
3Speed
If a control valve is sized for maximum flowrate, then rapid actuation is achieved, but control resolution decreases
Solution Approach 1:
The control function is segmented across two valves with different flow rate capabilities. The first control valve is optimized for high flow rates and rapid actuation, while the second control valve is optimized for low flow rates and precise control. This segmentation allows each valve to operate in its optimal performance range, achieving both rapid actuation and high control resolution in different operational modes.
Solution Approach 2:
The system uses partial action by activating only the necessary valve(s) based on requirements. For rapid actuation, only the first control valve is activated. For precise control, only the second control valve is activated. This partial activation approach allows each valve to provide its specialized function without the compromises required when a single valve must handle all scenarios.
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 control of hydraulic systems by allowing valves to be sized smaller than maximum requirements, reducing overall system cost while maintaining desired flowrates and control resolutions for different operational modes.
Implementation Method 1
A pump pumps a hydraulic fluid to move the actuator
Implementation Method 2
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
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.