Cylinder Head Spark Plug Offset for Combustion Control
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Solution Overview
Problem
Existing internal combustion engine cylinder heads with spark plugs and precombustion chambers experience undesirable fuel flow conditions due to the division of the fuel flow, leading to delayed ignition, knocking, and uneven combustion, exacerbated by wear phenomena.
Innovation Solution
The axis of rotation of the spark plug is offset from the axis of the precombustion chamber by between 0% and 15% of the greatest precombustion chamber diameter, with a curved flow axis to reduce fuel valve inclination and enhance mixing, allowing for faster and more controllable ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuel channel outlet is oriented toward the center of the precombustion chamber, then the fuel flow distribution is symmetric, but the ignition quality deteriorates due to delayed ignition and knocking
Solution Approach 1:
The patent applies asymmetry by offsetting the spark plug axis from the precombustion chamber center axis and orienting the fuel channel outlet toward the earth electrode rather than the chamber center. This asymmetric configuration creates a targeted fuel flow path that delivers the fuel-air mixture directly to the ignition zone, eliminating knocking and delayed ignition while improving combustion reliability.
2Stability of the object's composition
If additional guide elements are added to improve mixing, then mixing quality improves, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the additional guide elements from the system. Instead of using separate mixing guide components, the invention achieves effective mixing through the optimized fuel channel geometry and the asymmetric offset configuration of the spark plug, thereby improving mixing quality while reducing device complexity.
Solution Approach 2:
The patent employs curved flow paths in the fuel channel design to enhance mixing. The curved geometry of the fuel channel creates rotational flow patterns that improve fuel-air mixing without requiring additional guide elements, thus maintaining simple device structure while achieving stable composition.
3Weight of moving object
If the fuel valve inclination is reduced, then radial size is reduced and weight decreases, but flow control capability may be compromised
Solution Approach 1:
The patent compensates for the reduced flow control capability from lower fuel valve inclination by utilizing the asymmetric offset in the axial dimension. The fuel channel outlet is positioned and oriented to deliver fuel directly to the earth electrode along a targeted path, maintaining effective flow control while allowing for reduced radial size and weight.
4Reliability
If the spark plug axis is offset from the precombustion chamber axis, then combustion uniformity improves and knocking is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by creating a specific asymmetric configuration where the spark plug axis is offset from the precombustion chamber center axis. This localized asymmetry in the ignition system positioning enables uniform combustion and eliminates knocking throughout the combustion process, while the offset distance can be controlled within practical manufacturing tolerances.
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 improves ignition quality, reduces the tendency for knocking, and optimizes combustion uniformity, while minimizing weight and installation space, facilitating more efficient use of available space in the cylinder head.
Implementation Method 1
spark plug having at least one earth electrode for forming an ignition spark
Implementation Method 2
a tumble or swirl can be generated by the curvature, which can have a positive effect on mixing in the precombustion chamber
Data Source
AI summary
Various aspects of the present disclosure are directed to a cylinder head for an internal combustion engine. In one example embodiment, the cylinder head includes at least one spark plug having at least one earth electrode, a precombustion chamber accommodating the at least one spark plug, and a fuel channel which leads into the precombustion chamber. The fuel channel having a flow axis at an outlet that is oriented in the direction of the at least one earth electrode. An axis of rotation of the at least one spark plug has an offset with respect to the flow axis between 0 and 15% of the greatest precombustion chamber diameter.