Variable Float Blade Control With Proportional Relief Valves
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Solution Overview
Problem
Existing work vehicle control systems lack efficient mechanisms to manage fluid pressure and actuator movement in response to impact forces and position changes, leading to suboptimal control of work implements like blades during operations such as grading and excavation.
Innovation Solution
A control system with proportional pressure relief valves and a controller that manages fluid flow between a pump, actuator, and reservoir, allowing for set pressure points to regulate actuator movement and force application, enabling precise control of work implements in response to operator commands and environmental interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a control system uses traditional pressure relief valves, then the system structure is simple, but the control precision of work implement movement is insufficient
Solution Approach 1:
The patent applies dynamics by replacing fixed pressure relief valves with variable pressure relief valves that can dynamically adjust their pressure settings. The first and second variable pressure relief valves allow operator-adjustable pressure settings, enabling the system to adapt to different operational conditions and achieve precise control of work implement movement while maintaining reasonable system complexity.
2Ease of operation
If the system uses variable pressure relief valves for precise control, then the control precision improves, but the device complexity increases
Solution Approach 1:
The system incorporates sensors that automatically detect work implement position and impact forces, and the controller automatically adjusts fluid flow through the variable pressure relief valves based on this feedback. This self-service capability allows precise and easy operation without requiring complex manual adjustments, as the system autonomously optimizes its performance based on real-time conditions.
3Reliability
If the system monitors actuator movement to detect impacts, then the reliability of impact detection improves, but the loss of time for processing signals increases
Solution Approach 1:
The patent implements feedback mechanisms where sensors continuously monitor actuator movement and provide real-time data to the controller. The controller processes this feedback signal to detect impacts and automatically adjusts the variable pressure relief valves to respond to impact forces. This closed-loop feedback system ensures reliable impact detection with minimal time loss, as the continuous monitoring and automatic response eliminate delays associated with manual detection and adjustment.
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 precise control over work implement movement and force application, enhancing operational efficiency and safety by allowing for adaptive responses to impacts and terrain changes, thereby improving grading and excavation processes.
Implementation Method 1
A first proportional pressure relief valve is fluidly positioned between the reservoir and the first side of the actuator. The first proportional pressure relief valve permits flow of fluid from the first side of actuator to the reservoir in response to a pressure at the first side of the actuator being greater than a predetermined pressure value.
Implementation Method 2
The control system includes a reservoir that retains fluid, a pump in fluid communication with the reservoir, and an actuator in fluid communication with the pump
Data Source
AI summary
A method and control system operable to control movement of a work implement of a work vehicle. The control system includes a reservoir that retains fluid, a pump in fluid communication with the reservoir, and an actuator in fluid communication with the pump. The actuator has a first side and a second side. A control valve is fluidly positioned between the pump and the actuator, a first proportional relief valve is fluidly positioned between the pump and the first side of the actuator, and a second proportional relief valve is fluidly positioned between the pump and the second side of the actuator. The first proportional relief valve is configured to permit flow of fluid from the first side of the actuator to the reservoir when a pressure at the first side of the actuator exceeds a pressure set point.