Variable Area Poppet Nozzle Fuel Injector
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Solution Overview
Problem
Conventional fuel injectors have limited control over the injection nozzle opening, typically being only in a closed or open position, which restricts the variability of fuel flow and efficiency in engine operation.
Innovation Solution
A fuel injector design incorporating a poppet valve assembly and actuation assembly that allows the valve head to variably displace between a sealed and fully opened position, enabling a range of valve openings and thus varying fuel flow rates, utilizing a high pressure fuel duct to bias the valve to the closed position and an actuation assembly to move it between positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional fuel injector uses a simple open/closed valve mechanism, then the device complexity is reduced, but the fuel flow control variability is limited
Solution Approach 1:
The patent implements a dynamic valve opening mechanism where the poppet valve can assume multiple positions between fully closed and fully open states. The actuation member receives varying actuation signals that correspond to different fuel flow rates, enabling the valve opening area to be dynamically adjusted rather than restricted to binary open/closed states. This dynamic control resolves the contradiction by providing continuous fuel flow variability while maintaining a relatively simple poppet valve structure.
Solution Approach 2:
The patent changes the control parameter from binary (open/closed) to continuous (variable valve opening area). By varying the actuation signal to the actuation member, the system achieves different valve opening areas and corresponding fuel flow rates. This parameter change enables adaptable fuel flow control while using a straightforward poppet valve design, resolving the contradiction between versatility and complexity.
2Ease of operation
If a fuel injector allows variable valve opening positions, then fuel flow control is improved, but the device complexity increases
Solution Approach 1:
The actuation member serves multiple functions: it receives actuation signals, converts them into mechanical displacement, and directly controls the poppet valve opening. This multi-functionality enables variable fuel flow control through a single integrated component rather than requiring separate actuation and valve mechanisms, thereby improving ease of operation while limiting the increase in device complexity.
Solution Approach 2:
The poppet valve assembly is biased by pressurized fuel itself to remain in the closed position, eliminating the need for additional springs or mechanical biasing mechanisms. The high-pressure fuel duct system provides both the fuel supply and the closing force, making the system self-regulating and reducing overall device complexity while maintaining variable flow control capability.
3Device complexity
If a poppet valve assembly is biased by pressurized fuel to the closed position, then the device complexity is reduced, but the force required to open the valve increases
Solution Approach 1:
The pressurized fuel serving the dual purpose of both the working medium and the biasing force eliminates the need for separate spring mechanisms or mechanical biasing systems. The high-pressure fuel naturally pushes the poppet valve closed, and the same fuel pressure drives the valve open when actuation is applied, creating a self-service system that reduces complexity while managing forces through the fuel pressure itself.
Solution Approach 2:
The patent uses hydraulic pressure from the fuel itself to provide the closing bias force on the poppet valve. This pneumatic/hydraulic biasing replaces mechanical springs or weights, reducing device complexity. The force to open the valve is managed by the actuation member overcoming this hydraulic pressure, which is already present in the system for fuel delivery, thereby not requiring additional force generation mechanisms.
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 design enhances fuel flow control and efficiency by allowing for a variable fuel flow rate, improving engine performance and adaptability.
Implementation Method 1
The high pressure fuel duct may carry pressurized fuel
Data Source
AI summary
A fuel injector may include a housing, a poppet valve assembly, and an actuation assembly. The housing may define a longitudinal bore, a high pressure fuel duct in communication with the longitudinal bore and a valve seat including a valve seat surface and an aperture. The poppet valve assembly may include a stem and a valve head, be disposed within the longitudinal bore and be variably displaceable between a first position and a second position. In the first position, the valve head may abut the valve seat to seal the aperture. In the second position, the valve head may be displaced from the valve seat to open the aperture. The actuation assembly may operate to move the poppet valve assembly between the first position and the second position. The high pressure fuel duct may carry pressurized fuel that biases the poppet valve assembly to be in the first position.