Adjustable Pre-Chamber Shutter for Engine Ignition
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Solution Overview
Problem
Passive pre-chambers without series gap igniters face reliability issues over a wide range of engine operating conditions, often requiring a second spark plug, increasing costs and reducing space for other components, and series gap igniters can experience hot spots leading to undesired pre-ignition and reduced spark plug lifespan due to heat dissipation issues.
Innovation Solution
A pre-chamber system with adjustable shutters that modify the orifice opening area in response to engine load, allowing for enhanced combustion conditions by increasing the opening area at low loads and decreasing it at high loads, thereby improving fuel economy and ignition device longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a passive pre-chamber without series gap igniter is used, then the device complexity is reduced, but the reliability of ignition over full engine operating conditions deteriorates
Solution Approach 1:
The pre-chamber incorporates adjustable shutters that can dynamically change the orifice opening area based on engine operating conditions. This dynamic adjustment allows the system to maintain reliable ignition across the full range of engine operating conditions while using a simpler passive pre-chamber structure without series gap igniters.
2Reliability
If series gap igniter is used, then ignition reliability is improved, but the electrodes heat up causing hot spots and pre-ignition
Solution Approach 1:
The invention extracts the problematic series gap igniter electrodes from the system and replaces them with a passive pre-chamber design. The passive design eliminates the electrodes that generate hot spots and pre-ignition issues while maintaining ignition reliability through the adjustable orifice mechanism.
3Adaptability or versatility
If series gap igniter is used, then ignition at wide range of conditions is achieved, but the packaging size increases
Solution Approach 1:
The adjustable shutters provide dynamic control over the orifice opening area, enabling the pre-chamber to adapt to a wide range of engine operating conditions. This dynamic adjustment achieves the versatility of series gap igniters while maintaining a more compact pre-chamber volume.
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 adjustable pre-chamber system ensures reliable ignition over a wider range of engine conditions without the need for a second spark plug, reducing the risk of hot spots and enhancing combustion stability and efficiency.
Implementation Method 1
an air-fuel mixture is inducted into the passive pre-chamber via a pressure differential between the passive pre-chamber and the cylinder during a compression stroke
Implementation Method 2
the spark plug in the pre-chamber is actuated, igniting the fraction of the air-fuel mixture in the pre-chamber
Implementation Method 3
jets of flame and hot gas may exit the pre-chamber and enter the cylinder via one or more holes in the pre-chamber walls
Data Source
AI summary
Methods and systems are provided for a pre-chamber. In one example, the pre-chamber includes a moveable element configured to adjust an orifice opening area of the pre-chamber in response to conditions.