Pre-chamber Angular Positioning for Combustion Flame Distribution
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Solution Overview
Problem
Pre-chamber-ignition internal combustion engines face challenges in ensuring rapid combustion while minimizing thermal loading on the cylinder head base and piston crown, as existing designs cannot precisely control the angular position of pre-chambers, leading to inefficient ignition flare distribution.
Innovation Solution
The pre-chamber is fixed in a predetermined angular position relative to the cylinder head, allowing for variable angles of transfer openings to maximize spacing from the cylinder head base and piston crown, ensuring optimal ignition flare distribution and volume engagement in the main combustion chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pre-chamber is screwed in place without angular positioning, then the installation is simple, but the precise angular position cannot be established leading to inefficient ignition flare distribution
Solution Approach 1:
A positioning element (such as a positioning pin or keyway) is introduced as an intermediary component between the pre-chamber and the cylinder head. This mediator ensures precise angular positioning of the pre-chamber without complicating the overall installation process, resolving the contradiction between installation simplicity and angular position precision.
2Reliability
If the ignition flares are made larger in size, then the ignition reliability improves, but severe thermal loading occurs on the cylinder head base and piston crown
Solution Approach 1:
The transfer openings are strategically positioned at locations where they create optimal ignition flare distribution throughout the main combustion chamber. By carefully selecting the angular positions and orientations of transfer openings, the system achieves reliable ignition without concentrating excessive thermal energy on specific areas like the cylinder head base or piston crown, thus resolving the contradiction between ignition reliability and thermal loading.
3Productivity
If the transfer openings are positioned to maximize combustion chamber volume engagement, then rapid combustion is achieved, but thermal loading on cylinder head base and piston crown increases
Solution Approach 1:
The angles and positions of transfer openings are optimized as design parameters to achieve the best compromise between combustion speed and thermal loading. By varying these geometric parameters, the system enables rapid combustion through effective flame propagation while distributing thermal energy more evenly to avoid excessive localized heating.
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 approach guarantees rapid combustion by minimizing thermal loading and optimizing the main combustion chamber volume, allowing for adaptable ignition flare sizes and impulses based on local demands.
Implementation Method 1
A pre-chamber combustion chamber is formed in the pre-chamber. At least one ring of transfer openings connects the pre-chamber combustion chamber to the main combustion chamber. Ignition flares issuing from the transfer openings serve to reliably ignite a mixture in the main combustion chamber.
Data Source
AI summary
An internal combustion engine includes a cylinder head having a cylinder head base, a cylinder wall, and a piston which is movable along a cylinder axis and has a piston crown. A main combustion chamber is formed between the cylinder head base, the cylinder wall, and the piston crown. A precombustion chamber is inserted into a bore of the cylinder head and is fixed relative to the bore in the circumferential direction of the bore. The axis of the bore is at least substantially parallel to the cylinder axis, and a precombustion-type combustion chamber is formed in the precombustion chamber. At least one ring of transfer openings connects the precombustion-type combustion chamber to the main combustion chamber, and in each case, the angle which the transfer opening encloses with the cylinder axis differs for at least two transfer openings of the at least one ring.