Fuel Injector Control Valve Arrangement for Pressure Wave Management
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Solution Overview
Problem
Existing fuel injector designs face limitations in achieving high injection pressure due to high stress zones and pressure wave variability, particularly in the intersection area of the filling passage and valve bore, which restricts manufacturability and injection precision.
Innovation Solution
A control valve arrangement with a filling chamber and a separate seat plug that allows for a large opening in the valve body, enabling easier manufacturing and better control of pressure waves, featuring a filling valve member biased open by a spring and a control valve member biased closed by another spring, with a main feedhole and filling hole orientation that reduces mechanical stress and pressure wave propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate control valve and filling valve are used to achieve three way valve function, then the valve function is improved, but the device complexity increases
Solution Approach 1:
The patent combines the control valve and filling valve into a single integrated valve body structure. The control valve member and filling valve member are arranged in the same valve body, sharing common structural elements such as the valve bore and seating surfaces. This integration achieves the three-way valve function while reducing device complexity by eliminating the need for completely separate valve assemblies.
2Ease of manufacture
If the filling chamber is provided with a large opening in the valve body, then the manufacturability is improved, but the structural compactness deteriorates
Solution Approach 1:
The patent segments the valve body structure by introducing a removable seat plug that closes the filling chamber. This allows the filling chamber to be accessed during manufacturing through the large opening, enabling easy installation of the seat plug and other components. After assembly, the seat plug is installed to close the opening, maintaining structural integrity and compactness during operation while preserving manufacturing ease.
3Reliability
If the filling hole and main feedhole are oriented substantially parallel, then the pressure wave control is improved, but the fluid communication efficiency deteriorates
Solution Approach 1:
The patent introduces a throttling orifice as an intermediary element in the filling hole. This orifice controls and regulates the fuel flow through the filling hole, enabling better pressure wave management by creating a controlled restriction point. The throttling orifice mediates between the parallel hole orientation (which provides pressure control) and the need for adequate fluid communication efficiency, allowing optimized flow characteristics.
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 solution enhances control over pressure waves and increases achievable injection pressure while allowing for flexible manufacturing of the filling chamber volume, reducing mechanical stress and improving fuel injection precision.
Implementation Method 1
The filling valve member is normally biased open by a first spring
Implementation Method 2
said control valve member being normally biased closed by a second spring
Implementation Method 3
the seat plug is press fitted with interference in the filling chamber
Data Source
AI summary
A control valve arrangement includes a valve body with a filling chamber with a filling hole. A filling valve is arranged in the filling chamber for opening or closing a first fluid communication controlling filling of a first control chamber, the filling valve having a filling valve member with a moving valve seat, the filling valve member being normally biased open by a first spring. A control valve opens and closes a second fluid communication for controlling the emptying of the first control chamber, the control valve being normally biased closed by a second spring. A plug is arranged in the valve body for closing the filling chamber, the plug being provided with an opening which cooperates with the moving valve seat, the opening defining the first fluid communication between the filling chamber and the first control chamber.