Segmented Spark Plug with Ion Sensing for Diesel Soot Removal
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Solution Overview
Problem
Conventional spark plugs fail to effectively initiate combustion and control soot deposits in diesel engines due to inefficiencies in combustion processes and corrosive environments, leading to soot accumulation on insulator tips which are not adequately burned off.
Innovation Solution
A spark plug design featuring a center electrode, insulator, and ground shield with a spark gap between the center electrode tip and ground shield, capable of producing high-energy sparks to burn off soot and incorporating ion sensing capabilities for combustion control, using materials like nickel or stainless steel alloys for durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional spark plug design is used, then the structure is simple and easy to manufacture, but soot accumulates on the insulator tip and cannot be effectively burned off
Solution Approach 1:
The spark plug is segmented into distinct functional zones: a first spark gap for combustion initiation and a second spark gap positioned on the insulator tip for soot burning. This segmentation allows each zone to perform its specific function effectively, with the second spark gap directly addressing the soot accumulation problem on the insulator tip.
Solution Approach 2:
An intermediate electrode is introduced as a mediator between the center electrode and the ground electrode. This intermediate electrode creates the second spark gap on the insulator tip surface, enabling soot combustion without requiring a complete redesign of the entire spark plug structure.
2Reliability
If the insulator tip is exposed to burn off soot, then soot removal improves, but the insulator becomes more susceptible to corrosive effects
Solution Approach 1:
The ground shield is extended locally to cover and protect the insulator tip surface from corrosive combustion byproducts, while the second spark gap is positioned on the exposed portion of the insulator tip to enable soot burning. This local quality differentiation allows simultaneous protection and functionality.
Solution Approach 2:
The extended ground shield acts as an intermediary protective barrier between the corrosive environment and the insulator tip, while still allowing the second spark gap to function for soot combustion on the exposed insulator surface.
3Reliability
If a second spark gap is added for soot burning, then soot removal capability improves, but device complexity increases
Solution Approach 1:
The extended ground shield serves multiple functions: it protects the insulator from corrosion, provides a reference electrode for the second spark gap, and maintains structural integrity. This multi-functionality reduces the need for additional separate components despite the added soot burning capability.
Solution Approach 2:
The intermediate electrode serves as a mediator that creates the second spark gap while also being integrated into the existing spark plug structure, minimizing the increase in device complexity while achieving improved soot removal.
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 design maintains operability under high cylinder pressures, resists corrosive environments, and effectively burns off soot deposits while providing combustion sensing and control capabilities.
Implementation Method 1
application of a high energy surface spark
Implementation Method 2
initiates combustion, facilitates combustion control and bums off soot deposits
Implementation Method 3
ion sensor for combustion feedback and control
Data Source
AI summary
An igniter for an internal combustion engine, the igniter comprising: a center electrode; an insulator disposed about the center electrode; a ground shield disposed about the insulator, the insulator having a tip portion extending past an end portion of the ground shield and a tip portion of the center electrode extending through and away from the tip portion of the insulator; and a spark gap disposed between the tip portion of the center electrode and the end portion of the ground shield.