Dual Spark Plug Ignition Energy for Lean Burn Combustion
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Solution Overview
Problem
Conventional spark plugs struggle to efficiently ignite lean air-fuel mixtures in engines, leading to misfires or incomplete combustion due to insufficient ignition energy.
Innovation Solution
A dual spark plug design featuring a metal body, insulating ceramic material, central electrodes connected to an ignition coil, and ground electrodes with a noise filter made of glass, which enhances ignition energy and improves combustion efficiency by generating spark discharges between central and ground electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional single spark plug is used, then the device complexity is low, but the ignition energy is insufficient for lean air-fuel mixtures
Solution Approach 1:
The single spark plug is segmented into two separate central electrodes, each capable of generating independent spark discharges. This segmentation increases the total ignition energy available for lean air-fuel mixtures while maintaining a relatively simple overall structure that integrates both electrodes into a single replaceable unit.
2Loss of energy
If the air/fuel ratio is increased for lean burn combustion, then fuel efficiency improves, but combustion stability deteriorates due to insufficient ignition
Solution Approach 1:
The patent applies partial action by using two central electrodes that provide sufficient ignition energy for lean mixtures without requiring excessive fuel enrichment. The dual electrodes deliver just enough additional ignition capability to stabilize lean combustion, allowing the engine to operate efficiently at high air/fuel ratios (e.g., 30:1) without compromising reliability.
3Productivity
If a dual spark plug design is implemented, then combustion efficiency improves, but the manufacturing complexity increases
Solution Approach 1:
The patent merges two central electrodes and their associated components into a single integrated spark plug assembly. This combining approach allows the dual electrode system to achieve superior combustion efficiency while simplifying manufacturing processes, as the entire dual-electrode unit can be produced and installed as one component rather than requiring separate assembly of multiple parts.
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 dual spark plug design significantly improves combustion efficiency, reduces the likelihood of knocking, and enhances fuel efficiency by increasing ignition energy and flame propagation speed compared to single spark plugs.
Implementation Method 1
a mixture of air and fuel is ignited by a spark generated by a spark plug, and combustion is performed
Implementation Method 2
the mixture injected into a combustion chamber during a compression stroke is ignited by the discharge phenomenon of the spark plug
Data Source
AI summary
A dual spark plug may include: a metal body made of metal material, an insulating body provided inside of the metal body and made of an insulating material, a pair of central electrodes provided inside of the insulating body and electrically connected with an ignition coil, and a pair of ground electrodes respectively extended from both ends the metal body, and spaced apart from ends of the pair of central electrodes by a predetermined distance.