Plasma Ignition Plug Using Boron Nitride Insulator
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Solution Overview
Problem
Conventional spark plugs are limited by the marginal conductivity and electrical persistence of metallic elements, and the finite electrical saturation of porcelain ceramic insulating materials, which restrict their ability to efficiently ignite air-fuel mixtures at elevated ratios beyond 14.7:1, leading to suboptimal combustion efficiency and exhaust profiles.
Innovation Solution
The plasma ignition plug employs vitreous machinable ceramics like boron-nitride for elevated electrical saturation, thorium-alloyed tungsten for fast switching, titanium for high resistance to deterioration, and beryllium-alloyed copper for enhanced conductivity, enabling higher current and faster switching rates, and introduces a dissociating plasma field to achieve near-complete combustion and improved exhaust remediation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional porcelain ceramic insulating materials are used in spark plugs, then the device structure is simple and manufacturing is easy, but the electrical saturation is finite and cannot support elevated current levels required for high air-to-fuel ratios
Solution Approach 1:
The patent changes the electrical parameter (electrical saturation) of the insulator material by replacing conventional porcelain ceramic with vitreous machinable ceramic having breakdown voltage exceeding 75,000 volts, enabling support for elevated current levels and high air-to-fuel ratios up to 40:1
Solution Approach 2:
The patent employs composite material structure combining vitreous machinable ceramic insulator with thorium-alloyed tungsten anode and beryllium-alloyed copper cathode, creating a multi-material system that achieves superior electrical saturation and conductivity properties
2Speed
If metallic elements with marginal conductivity are used in spark plugs, then the device is simple to manufacture, but the electrical persistence is insufficient for fast switching times required for plasma generation
Solution Approach 1:
The patent changes the electrical conductivity parameter of the electrode materials by using thorium-alloyed tungsten anode and beryllium-alloyed copper cathode, achieving fast switching times and electrical persistence necessary for plasma generation at elevated current levels
Solution Approach 2:
The patent replaces conventional mechanical spark emission with plasma generation through optimized electrical parameters and material properties, transitioning from simple spark arcs to controlled plasma fields for ignition
3Productivity
If conventional spark plugs are used, then the device structure is simple, but combustion efficiency is suboptimal and exhaust remediation is incomplete
Solution Approach 1:
The patent changes the ignition mechanism from conventional spark to plasma field by adjusting electrical parameters (voltage exceeding 75,000 volts, elevated current levels), achieving near-complete molecular dissociation and combustion efficiency approaching 100%
Solution Approach 2:
The patent replaces the mechanical spark ignition system with a plasma-based ignition system, using electromagnetic field generation to create dissociating plasma that enables complete combustion and thorough exhaust remediation
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 design supports higher air-to-fuel ratios (up to 30:1-40:1), increases horsepower, reduces fuel consumption, decreases engine temperature, and virtually eliminates unburned carbon particulates, achieving near 100% molecular dissociation and complete remediation of exhaust emissions.
Implementation Method 1
The insulating body is comprised of a vitreous machinable ceramic, such as boron-nitride... which provide elevated electrical saturation limits
Implementation Method 2
The plasma generated by the inventive ignition plug increases molecular dissociation of the fuel such that virtually 100% combustion is achieved
Implementation Method 3
The plasma emitter is disposed in the distal end of the insulating body and electrically connected to the central anode... capable of supporting input levels of current in the range of 75,000 volts DC
Data Source
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AI summary
A plasma ignition plug for an internal combustion engine has a thorium alloyed tungsten anode separated from a vanadium- or beryllium-alloyed copper cathode by a boron nitride ceramic powder insulator. A generally semi-spherical titanium emitter is electrically coupled to the anode and disposed within an end of the insulator so as to form an annular gap with a torus on the end of the cathode. The surface of the emitter protrudes slightly beyond the rim of the torus on the cathode. High amplitude pulses driven into the anode arc across the annular gap to the cathode at more than twenty-four spots simultaneously, generating a plasma ignition front.