Hydraulic Circuit Pressure Feedback for Slide Valve Control
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Solution Overview
Problem
Existing hydraulic systems face limitations in efficiently controlling pressure and adapting to various hydraulic components, leading to power loss and mechanical modifications, especially when dealing with high-speed implements and parasitic frequencies, which complicates the installation and operation of hydraulic machines.
Innovation Solution
A hydraulic circuit with a pressure sensor, actuator, and control unit that regulates the directional control slide valve, incorporating a leakage orifice to manage pressure and flow rates dynamically, allowing for adjustable pressure settings and reduced power loss, and featuring a temperature compensation mechanism to ensure stability across operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a secondary pressure limiter is used to protect the hydraulic component, then the component is protected against overpressures, but power is lost when the limiter opens and discharges flow directly to the tank
Solution Approach 1:
The control unit continuously monitors pressure sensor signals and automatically adjusts the slide valve position to maintain pressure below the limiter threshold, creating a closed-loop feedback system that prevents overpressure events before they occur and eliminates the need for disruptive limiter activation
Solution Approach 2:
The patent replaces the purely mechanical pressure limiter system with an electro-hydraulic control system using electronic sensors, control units, and actuators to actively manage pressure, substituting reactive mechanical relief with proactive electronic control
2Productivity
If the slide valve is actuated to maximum travel for high speed operation, then productivity is improved, but power loss increases when the component becomes blocked
Solution Approach 1:
The pressure sensor provides real-time feedback to the control unit, which detects blockage conditions through pressure changes and automatically adjusts the slide valve position to reduce flow and minimize power loss, enabling the system to maintain high-speed operation during normal conditions while automatically responding to abnormal blockage events
Solution Approach 2:
The system dynamically adjusts the slide valve position based on real-time operating conditions rather than maintaining a fixed maximum position, allowing optimal performance during normal operation while automatically adapting to prevent excessive power loss during blockage events
3Speed
If hydraulic components are modified to handle high-speed implements, then speed capability is improved, but device complexity and installation difficulty increase
Solution Approach 1:
The electronic control system with pressure sensing and automatic slide valve adjustment provides a universal solution that can manage various hydraulic components and implements without requiring physical modifications to each component, allowing high-speed operation capability to be achieved through control software rather than hardware redesign
Solution Approach 2:
The system achieves high-speed capability by dynamically changing operational parameters through electronic control of the slide valve position and pressure management, rather than requiring permanent mechanical modifications to the hydraulic components themselves
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 enables efficient operation by reducing power loss, maintaining high pressure for essential functions, and allowing for easier installation of diverse hydraulic components on the same machine, with improved pressure regulation and stability across a broader range of settings.
Implementation Method 1
a pressure sensor installed upstream of the hydraulic component downstream of the feed port and supplying information about the pressure of the hydraulic liquid
Implementation Method 2
a leakage orifice in the slide valve that creates a leakage towards the tank between the feed port and the component in the initial phase of the travel of the slide valve
Implementation Method 3
an actuator controlling the movement of the directional control slide valve
Data Source
AI summary
A hydraulic circuit includes a pump connected to a tank for supplying hydraulic liquid under pressure to a component via a directional control slide valve provided with a feed port connected to an inlet of the component and with a return port connected to an outlet of the component. The hydraulic circuit further includes a pressure limiter connected to the inlet of the component and the tank, and a feed control system for the hydraulic component including a pressure sensor installed upstream of the hydraulic component downstream of the feed port for supplying information about the pressure of the hydraulic liquid and a setpoint pressure. The feed control system further including an actuator for controlling the movement of the directional control slide valve, and a control unit for generating a control signal for the actuator based on information about the pressure measured at the feed port.