Twin Needle Valve Dual Mode Fuel Injector
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Solution Overview
Problem
Existing fuel injection systems struggle to produce both homogeneous charge compression ignition (HCCI) and conventional spray patterns with a single fuel injector, due to the need for different spray patterns and high complexity and expense of dual systems.
Innovation Solution
A dual mode fuel injector with independently controlled needle valve members and nozzles, allowing for the production of two distinct spray patterns from a common fuel source, enabling operation in HCCI and conventional modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single fuel injector is designed to produce different spray patterns, then versatility is improved, but device complexity increases
Solution Approach 1:
The injector is segmented into two independent needle valve members (first and second needle valves) with separate control mechanisms. Each needle valve controls a specific nozzle group (first nozzles at 15-45 degrees, second nozzles at 90-120 degrees), allowing independent selection of spray patterns. This segmentation enables the single injector to produce different spray patterns by activating only the required needle valve and nozzle combination, thereby achieving versatility without excessive complexity.
Solution Approach 2:
The injector employs dynamic control through independently actuated needle valves that can be selectively opened or closed based on operating conditions. The first needle valve controls fuel flow to first nozzles for HCCI mode, while the second needle valve controls fuel flow to second nozzles for conventional mode. This dynamic switching capability allows the injector to adapt spray patterns in real-time, resolving the contradiction between versatility and complexity.
2Object-generated harmful factors
If a dual injection system is implemented, then emissions reduction is improved, but cost and complexity increase
Solution Approach 1:
The patent merges HCCI injection capability and conventional injection capability into a single fuel injector unit. By integrating two needle valve members and two sets of nozzles with different spray angles into one injector, the system achieves dual-mode operation (HCCI and conventional injection) without requiring separate injection systems. This merging reduces the number of components, lowers cost, and simplifies the overall injection system while maintaining the ability to reduce emissions through appropriate spray pattern selection.
Solution Approach 2:
The single fuel injector is designed with multi-functionality to perform both HCCI injection and conventional injection tasks. The first needle valve and first nozzles (15-45 degrees) enable HCCI mode for low emissions, while the second needle valve and second nozzles (90-120 degrees) enable conventional injection for high load conditions. This universal design eliminates the need for separate specialized injectors, reducing system complexity and cost while maintaining effective emissions control across different operating ranges.
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
Enables reduced emissions by allowing flexible injection timing and patterns, reducing NOx, hydrocarbons, and particulates across a wide range of engine operations, while maintaining cost-effectiveness and simplicity.
Implementation Method 1
A pressure differential is created between a control chamber and a common fuel rail to move the valve needle members from their initial closed position to an open position
Data Source
AI summary
A fuel injector having an injector body defining a hollow interior configured to receive pressurized fuel, a first nozzle configured for providing a first fuel spray pattern, and a second nozzle configured for providing a second fuel spray pattern different from the first fuel spray pattern. The first and second nozzles may be configured to inject fuel supplied from a common source into a combustion space. The fuel injector may further include first and second needle valve members corresponding to the first and second nozzles, respectively. The first and second needle valve members may be positioned within the hollow interior of the injector body, with the second needle valve member being spaced from, but adjacent to the first needle valve member.