Rotary Fluid Device Multi-Level Phase Shift Control
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Solution Overview
Problem
Fixed displacement fluid devices cannot directly adjust the amount of fluid transferred during one complete rotation, leading to inefficiencies and mechanical complexity when variations are achieved through hydraulic flow control valves or variable fluid supplies.
Innovation Solution
A method for controlling a rotary fluid device with a fluid displacement assembly and control valves, where a desired displacement is achieved by selecting an optimal displacement family and phase shift angle based on peak displacements of displacement curves, allowing for variable displacement functionality without the need for hydraulic flow control valves or variable fluid supplies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hydraulic flow control valves or variable fluid supplies are used to achieve variations in fluid transfer, then the fluid transfer amount can be adjusted, but efficiency decreases and mechanical complexity increases
Solution Approach 1:
The patent applies dynamics by making the displacement mechanism adjustable through electronic control rather than fixed mechanical design. The system dynamically changes the displacement volume of the rotary fluid device by controlling the phase relationship between the input shaft and output shaft, allowing fluid transfer variation without mechanical complexity of traditional valves or variable supplies.
Solution Approach 2:
The patent replaces the mechanical system of hydraulic flow control valves or variable fluid supplies with an electronic control system that uses phase shift control. Instead of mechanical adjustment mechanisms, the system uses electronic signals to control the timing and sequence of fluid chamber pressurization and decompression, thereby adjusting displacement electronically.
2Adaptability or versatility
If hydraulic flow control valves or variable fluid supplies are used to achieve variations in fluid transfer, then the fluid transfer amount can be adjusted, but efficiency decreases
Solution Approach 1:
The system dynamically adjusts displacement by controlling the phase relationship between input and output shafts, allowing the fluid transfer amount to be varied in real-time. This dynamic control enables the system to match fluid transfer to actual demand, avoiding energy waste from transferring excess fluid that would then need to be controlled back through inefficient valve systems.
Solution Approach 2:
By replacing hydraulic flow control valves with electronic phase shift control, the system eliminates the energy losses associated with valve throttling and pressure drops. The electronic control system directly manages the timing of fluid chamber operations, maintaining higher system efficiency throughout the fluid transfer process.
3Device complexity
If a fixed displacement mechanism is used, then the device structure is simple, but the amount of fluid transferred cannot be adjusted during one complete rotation
Solution Approach 1:
The patent transforms the fixed displacement mechanism into a dynamic one by introducing phase shift control between the input and output shafts. The displacement volume is adjusted by changing the phase relationship during operation, allowing the same mechanical structure to provide variable fluid transfer without requiring complex mechanical adjustment mechanisms.
Solution Approach 2:
The system changes the operational parameters of the displacement mechanism by controlling the phase angle between input and output shafts. By varying this phase parameter electronically, the effective displacement volume changes while the physical structure remains simple, achieving adaptability without increasing structural complexity.
Data Source
AI summary
A method for controlling a rotary fluid device includes providing a rotary fluid device having a fluid displacement assembly and a plurality of control valves. The fluid displacement assembly includes a first member and a second member. The first and second members have relative movement and define a plurality of volume chambers. The plurality of control valves is in fluid communication with the plurality of volume chambers. A desired displacement is received. A relative position of the first and second members is determined. An optimal displacement family is selected from a plurality of displacement families that is based on peak displacements of a plurality of displacement curves. A phase shift angle for the optimal displacement family is selected so that an actual displacement of the fluid displacement assembly approaches the desired displacement. The control valves of the rotary fluid device are actuated in accordance with the phase shift angle.