Fluid Ejection Device Dual Mode Pressure Control
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Solution Overview
Problem
Fluid ejection devices for medical purposes face inefficiencies when there is a delay in reaching the required pressure for fluid ejection, leading to idle waiting times and difficulties in expediting operations, and they struggle to eject fluid when the pressure is separated from the target pressure.
Innovation Solution
A fluid ejection device with a pressure adjustment unit that adjusts the inner pressure of a fluid container to be closer to a target pressure, utilizing two ejection modes: one for when the pressure is near the target and another for when it is not, allowing for fluid ejection even when the pressure is not at the target, with a reporting device to inform the user of the ejection mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure is adjusted to reach the target pressure before ejection, then the fluid ejection is precise and controlled, but the time taken for ejection increases due to idle waiting
Solution Approach 1:
The system dynamically switches between two ejection modes based on real-time pressure conditions. When pressure is close to target pressure, first ejection mode is activated for precise control. When pressure deviates from target pressure, second ejection mode is activated to allow immediate ejection without waiting, thus reducing idle time while maintaining operational flexibility
Solution Approach 2:
The control system changes the pressure threshold parameter dynamically. By defining a first threshold value closer to target pressure and a second threshold value farther from target pressure, the system adapts its ejection criteria based on current pressure conditions, enabling either precise controlled ejection or expedited ejection depending on the pressure state
2Reliability
If the fluid ejection waits for target pressure to be reached, then the ejection is reliable, but the user must wait idly and cannot expedite the operation
Solution Approach 1:
The ejection control unit dynamically adapts its behavior based on pressure conditions. It provides a first ejection mode for precise controlled ejection when pressure is near target pressure, and a second ejection mode for expedited ejection when pressure deviates, giving users flexibility to wait for optimal conditions or proceed immediately based on operational needs
Solution Approach 2:
The system continuously monitors pressure and provides feedback through the reporting device to inform users of the current ejection mode. This feedback mechanism allows users to understand whether the system is in precise control mode or expedited mode, enabling informed decision-making about operational timing
3Loss of time
If the pressure is separated from target pressure, then the ejection can proceed immediately, but the fluid pressure is not at the optimal level for ejection
Solution Approach 1:
The second ejection mode allows the system to proceed with ejection even when pressure is not at the optimal target level, accepting partial completion of the pressure adjustment process. This enables immediate operation when time is critical, with the understanding that pressure optimization may be compromised but operational urgency is addressed
Data Source
AI summary
A fluid ejection device includes a fluid ejection unit that ejects a fluid and an ejection control unit that controls ejection of the fluid. A fluid container accommodates the fluid supplied to the fluid ejection unit. A pressure adjustment unit adjusts an inner pressure of the fluid container such that the inner pressure gets closer to a target pressure than a first threshold value. The ejection control unit has first and second ejection modes. In the first ejection mode, when the inner pressure is closer to the target pressure than a second threshold value separated from the target pressure farther than the first threshold value, the ejection control unit receives a demand for ejection of fluid. In the second ejection mode, even when the inner pressure is not closer to the target pressure than the second threshold value, the ejection control unit receives a demand for ejection of fluid.