Auxiliary Chamber Engine Flame Distribution
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Solution Overview
Problem
In auxiliary chamber type internal combustion engines, the combustion state in the main chamber is not homogenized, leading to slower combustion in certain regions, which can result in increased hydrocarbon and soot production and variations in combustion state, particularly in pent roof-shaped combustion chambers.
Innovation Solution
The engine design includes a main chamber with inclined cylinder head surfaces and an auxiliary chamber connected by multiple passages, where the first connecting passage injects a flame along the ridge line of the cylinder head, and the second connecting passage injects the flame towards the piston, ensuring even combustion across the main chamber by directing the flame to larger and smaller space regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple connecting passages are arranged at equal intervals around the central axis of the auxiliary chamber, then the structure is simplified and manufacturing is easier, but the combustion state in the main chamber becomes non-uniform with slower combustion in certain regions
Solution Approach 1:
The patent applies asymmetry by arranging connecting passages at non-uniform intervals around the central axis of the auxiliary chamber. Specifically, the first connecting passage is positioned at a first angle and the second connecting passage at a second angle that differs from equal angular spacing. This asymmetric arrangement creates more uniform flame distribution across the main chamber, eliminating the non-uniform combustion problem that occurs with equal interval spacing while maintaining manufacturing feasibility.
2Loss of energy
If the flame propagation distance in the main chamber is shortened, then thermal efficiency is improved, but combustion may be incomplete in certain regions leading to increased hydrocarbon and soot
Solution Approach 1:
The patent applies local quality by directing flames from different connecting passages to different regions of the main chamber. The first connecting passage directs flame to a first region while the second connecting passage directs flame to a second region, ensuring that each region receives appropriate flame exposure. This localized flame distribution achieves complete combustion throughout the main chamber, reducing hydrocarbon and soot emissions while maintaining short flame propagation distances for high thermal efficiency.
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 configuration promotes balanced combustion in the main chamber, reducing heat loss and enhancing combustion efficiency by ensuring the flame reaches all regions uniformly, thereby improving fuel efficiency and reducing hydrocarbon and soot production.
Implementation Method 1
an air-fuel mixture is formed from a fuel injected into the main chamber. The formed air-fuel mixture is supplied to the auxiliary chamber through the connecting passage at the time of compression, and is ignited by an ignition plug in the auxiliary chamber. Therefore, a flame is formed.
Implementation Method 2
The flame formed in the auxiliary chamber is injected into the main chamber through the connecting passage to ignite the air-fuel mixture in the main chamber. In this way, by injecting the flame formed in the auxiliary chamber into the main chamber, a combustion speed of the main chamber is increased.
Data Source
AI summary
An auxiliary chamber type internal combustion engine includes a main chamber, an auxiliary chamber, a plurality of connecting passages connecting the main chamber with the auxiliary chamber, and an ignition plug configured to ignite a mixture introduced into the auxiliary chamber. The plurality of connecting passages include a first connecting passage having a first injection port and a second connecting passage having a second injection port. A flame generated in the auxiliary chamber is injected into the main chamber through the first and second injection ports. The first injection port is configured such that the flame propagates along a ridge line at which the plurality of inclined surfaces of the cylinder head intersect. The second connecting passage extends in a direction oriented to the piston with respect to the first connecting passage when viewed from a direction perpendicular to the cylinder axial direction.