Variable Displacement Pump Bias Pressure Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing variable displacement pumps in the aerospace industry face challenges in efficiently controlling displacement to meet system responsiveness and stability standards across varying operating conditions.
Innovation Solution
A variable displacement pump system that includes a pressure port to divert high-pressure fluid to a bias pressure line, where a controllable valve meters the bias pressure to adjust the displacement of the pump through a pressure actuated main piston and biasing member, allowing real-time control of the displacement without stopping flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If variable displacement pumps are used to provide greater efficiency by changing flow for each operating condition, then energy efficiency is improved, but system responsiveness and stability become difficult to control
Solution Approach 1:
The control system continuously monitors the bias pressure line pressure and adjusts the controllable valve position accordingly to maintain the predetermined pressure set point. This closed-loop feedback mechanism ensures that displacement changes are precisely controlled, maintaining system responsiveness and stability while achieving energy efficiency through variable flow adjustment.
Solution Approach 2:
The patent replaces traditional mechanical control mechanisms with an electrohydraulic control system. The controllable valve, actuated by hydraulic pressure from the bias pressure line, provides precise electronic control over pump displacement. This substitution enables more accurate and responsive control compared to purely mechanical systems, resolving the contradiction between efficiency and reliability.
2Reliability
If pump displacement is controlled to meet system responsiveness and stability standards, then system reliability is improved, but control complexity increases
Solution Approach 1:
The bias pressure line acts as an intermediary mechanism that translates desired displacement changes into controlled hydraulic pressure adjustments. By using this intermediate pressure control system, the patent simplifies the overall control architecture while maintaining precise responsiveness and stability. The bias pressure line mediates between the controllable valve and the pump displacement mechanism, reducing control complexity.
3Productivity
If real-time control of displacement is implemented without stopping flow, then productivity is improved, but control precision becomes more difficult to maintain
Solution Approach 1:
The control system is designed to adjust pump displacement continuously while maintaining uninterrupted fluid flow through the system. The controllable valve modulates the bias pressure line pressure in real-time, enabling smooth displacement transitions without stopping the pump or interrupting the main fluid flow. This continuous adjustment capability maintains both productivity and control precision.
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
This solution enables precise control of the variable displacement pump's output pressure, ensuring system stability and responsiveness across different operating conditions, while maintaining continuous flow.
Implementation Method 1
A controllable valve is disposed in the bias pressure line configured to meter a pressure of the bias pressure line
Implementation Method 2
A biasing member is operatively connected to the pressure actuated main piston and is configured to bias the main piston to a position to achieve a pressure output for the predetermined pressure set point
Implementation Method 3
A pressure port is disposed in the main line downstream of the variable displacement pump and is configured to port a portion of the high pressure fluid from the main line to a bias pressure line
Data Source
AI summary
In accordance with at least one aspect of this disclosure, a variable displacement pump system can include, a variable displacement pump disposed in a main line and configured to supply pressure to receive a low pressure fluid and to output a high pressure fluid. The main line can connect a hydraulic fluid source to a plurality of system actuators, where the variable displacement pump is disposed in the main line between the hydraulic fluid source and the plurality of system actuators to pressurize the hydraulic fluid.