Spark Plug Resistance Element Composition for EMC Stability
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Solution Overview
Problem
Conventional spark plug resistance elements made of ceramic materials, such as glass, lack adequate electrical stability over the useful life of the spark plug, which affects their electromagnetic compatibility.
Innovation Solution
A spark plug resistance element composed of at least one inorganic amorphous oxide and one first inorganic crystalline oxide with a relative dielectric permittivity of at most 15, where the inorganic amorphous oxide forms a noncrystalline matrix embedding the crystalline oxide, enhancing electromagnetic compatibility while maintaining high electrical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ceramic resistance elements (glass) are used, then electrical insulation is maintained, but electrical stability over useful life is inadequate
Solution Approach 1:
The patent applies composite materials by combining inorganic amorphous oxide (forming a noncrystalline matrix) with inorganic crystalline oxide particles (such as ZnO, SnO2, TiO2, ZrO2, HfO2) to create a resistance element with superior electrical stability. The crystalline oxide particles are embedded within the amorphous oxide matrix, creating a composite structure that maintains both electrical insulation and enhanced stability over the spark plug's useful life.
Solution Approach 2:
The patent changes the material parameters by specifying that the inorganic crystalline oxide must have a relative dielectric permittivity of at most 15 (preferably at most 12). This parameter control ensures the composite material achieves the desired electrical stability while maintaining electromagnetic compatibility. The specific dielectric permittivity requirement distinguishes the invention from conventional glass-based resistance elements.
2Reliability
If resistance element material is changed to improve electrical stability, then electromagnetic compatibility may worsen due to increased electromagnetic radiation
Solution Approach 1:
The patent controls electromagnetic radiation by selecting inorganic crystalline oxides with specific dielectric permittivity values (at most 15). This parameter selection ensures that the resistance element maintains low electromagnetic radiation emission while achieving improved electrical stability, thus resolving the contradiction between reliability and electromagnetic compatibility.
Solution Approach 2:
The composite structure of amorphous oxide matrix with embedded crystalline oxide particles creates a material that simultaneously reduces electromagnetic radiation and improves electrical stability. The specific combination and distribution of oxide phases within the composite enable both electromagnetic compatibility and enhanced electrical performance over time.
3Object-generated harmful factors
If inorganic crystalline oxide with low dielectric permittivity is used, then electromagnetic compatibility improves, but manufacturing complexity increases
Solution Approach 1:
The patent simplifies manufacturing by specifying clear parameter ranges for the inorganic crystalline oxide (dielectric permittivity at most 15, preferably at most 12) and providing a defined composition range for the inorganic amorphous oxide. These parameter specifications guide material selection and processing, making it easier to manufacture consistent, high-performance resistance elements while achieving improved electromagnetic compatibility.
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 described spark plug resistance element achieves lower electromagnetic radiation emission, thereby improving electromagnetic compatibility while maintaining stable and high electrical resistance, ensuring long-term performance and reduced electromagnetic interference.
Implementation Method 1
The inorganic amorphous oxide forms a noncrystalline matrix in which the first inorganic crystalline oxide is embedded
Implementation Method 2
the first inorganic crystalline oxide having a relative dielectric permittivity of at most 15... inorganic crystalline oxides having a relative dielectric permittivity of at most 15, and in particular of at most 12, reduce the electromagnetic radiation
Implementation Method 3
retaining the same good electrical insulation, i.e., a high electrical resistance... maintaining stable and high electrical resistance
Data Source
AI summary
A spark plug resistance element that includes at least one inorganic amorphous oxide and at least one first inorganic crystalline oxide having a relative dielectric permittivity of at most 15. A spark plug that includes at least one spark plug resistance element is also described.