Precombustion Chamber Ignition Device for Corona Discharge
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Solution Overview
Problem
Corona ignition systems in internal combustion engines face challenges with electrode arrangement and high voltage requirements, leading to potential damage from deposits and inadequate fluid exchange, especially in large combustion chambers like stationary gas Otto engines.
Innovation Solution
A device with a precombustion fluid inlet directly connected to a fuel source, allowing independent fuel supply to the precombustion chamber, reducing dependence on conventional valves and enabling a richer fuel/air mixture for improved ignition, along with a T-shaped electrode and varying precombustion chamber geometry for efficient corona discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If corona ignition is used in large combustion chambers with conventional valve-based fuel supply, then ignition can be achieved, but electronic components are vulnerable to damage from deposits and fluid exchange instability
Solution Approach 1:
The fuel supply system is segmented into two independent paths: a conventional valve-based supply to the combustion chamber and a direct fuel injection system supplying the precombustion chamber. This segmentation isolates the corona discharge electronics from the valve mechanism, eliminating deposit-related damage risks to electronic components while maintaining ignition functionality in large combustion chambers.
Solution Approach 2:
A precombustion chamber is introduced as an intermediary between the fuel supply and the main combustion chamber. This intermediate chamber receives fuel directly via injection, performs corona discharge ignition there, and then transfers the ignited mixture to the combustion chamber. This intermediary structure protects electronic components from direct exposure to combustion deposits while ensuring stable fluid exchange.
2Device complexity
If fuel supply to precombustion chamber depends on conventional inlet valves, then system complexity is reduced, but fluid exchange stability deteriorates due to valve-related deposits and blockages
Solution Approach 1:
The fuel supply function for the precombustion chamber is extracted from the conventional valve-based system and implemented through a dedicated direct injection mechanism. This extraction eliminates the dependency on inlet valves for precombustion chamber fuel supply, preventing valve-related deposits and blockages from affecting fluid exchange stability, while adding only minimal system complexity.
3Power
If high voltages are used for corona discharge in large combustion chambers, then ignition capability is improved, but the risk of electronic component damage increases
Solution Approach 1:
The precombustion chamber serves as an intermediary that reduces the ignition power requirement for the main combustion chamber. By performing corona discharge ignition in the smaller precombustion chamber first, the system achieves reliable ignition with lower voltages than would be required for direct ignition in the large combustion chamber, thereby reducing electronic component damage risk while maintaining ignition capability.
Solution Approach 2:
The ignition process is segmented into two stages: first corona discharge in the precombustion chamber, then propagation to the main combustion chamber. This segmentation allows the high-voltage corona discharge to occur in a confined space with lower energy requirements, reducing the power and voltage demands on electronic components compared to direct ignition in the entire combustion 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
This configuration enhances ignition reliability by reducing the risk of electronic component damage, stabilizing fluid exchange, and optimizing corona discharge for efficient ignition in internal combustion engines.
Implementation Method 1
a control device or regulating device regulates the supply of voltage to the electrode in such a way that a corona discharge takes place in the precombustion chamber
Data Source
AI summary
The invention relates to a device for igniting a fuel/air mixture in the combustion chamber of an internal combustion engine. The device includes an electrode which is connected to a voltage source and extends into a precombustion chamber, and the precombustion chamber is separated at least in some regions from the combustion chamber by a wall. A control device or a regulating device is provided which controls the voltage supply to the electrode such that a corona discharge is carried out in the precombustion chamber. The wall has at least one opening for exchanging fluids between the combustion chamber and precombustion chamber, and a fluid inlet opens into the precombustion chamber.