RF Microwave Ignition Antenna for Combustion Stability
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Solution Overview
Problem
Conventional spark-ignited internal combustion engines face limitations in spark duration and energy, which affect dilution tolerance and combustion stability, and are constrained by the physical layout of spark plugs in the cylinder head.
Innovation Solution
A radio frequency or microwave ignition system that eliminates the need for spark plugs by using focused RF/microwave energy to create a wireless spark and plasma within the combustion chamber, allowing for flexible antenna placement and improved ignition efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional spark plugs are used for ignition, then the ignition system is simple and reliable, but the spark duration and energy are limited, reducing dilution tolerance and combustion stability
Solution Approach 1:
The patent replaces the mechanical spark plug system with an RF/microwave electromagnetic field-based ignition system. The transmit antenna generates RF/microwave energy that induces current in the receive antenna, creating a spark gap discharge without mechanical contact. This substitution enables longer spark duration and higher energy output while improving combustion stability through wireless energy transfer.
Solution Approach 2:
The patent changes the ignition mechanism from low-energy electrical discharge in spark plugs to high-energy RF/microwave induced plasma. By operating at RF/microwave frequencies and using resonant coupling between antennas, the system achieves significantly higher energy density and longer duration ignition, directly addressing the limitation of conventional spark plugs.
2Adaptability or versatility
If conventional spark plugs are installed in the cylinder head, then the ignition system is compact, but the flame kernel position is fixed at the top of the cylinder, limiting combustion flexibility
Solution Approach 1:
The patent moves the ignition system from a fixed spatial position (cylinder head) to a flexible three-dimensional configuration within the combustion chamber. The transmit and receive antennas can be positioned at various locations and orientations, enabling flame kernel generation anywhere in the chamber volume, not just at the top center position constrained by spark plug mounting holes.
Solution Approach 2:
The antenna-based ignition system serves multiple functions: it can be positioned flexibly within the combustion chamber, generates ignitable plasma through electromagnetic coupling, and enables various combustion modes (homogeneous charge compression ignition, stratified charge, etc.). This universal approach replaces the single-function spark plug with a versatile electromagnetic ignition platform.
3Quantity of substance
If spark plugs are used for ignition, then the system is well-established, but the number of spark plugs per cylinder is limited by physical space, reducing ignition coverage
Solution Approach 1:
The patent segments the ignition function into transmit and receive antenna components that can be distributed at multiple locations within the combustion chamber. Instead of being constrained to single mounting points in the cylinder head, multiple antenna pairs can be positioned throughout the chamber volume, creating multiple independent ignition zones simultaneously or sequentially.
Solution Approach 2:
The receive antenna is nested within the electromagnetic field generated by the transmit antenna. The transmit antenna creates a volumetric electromagnetic field that couples with the receive antenna positioned anywhere within its field coverage area. This nested relationship allows one ignition system to effectively cover a large volume, replacing the need for multiple discrete spark plugs.
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 solution enhances combustion by improving flame kernel development, chemical kinetics, and flame speed, enabling higher dilution tolerance, faster burn rates, and cooler combustion while simplifying engine design and reducing maintenance costs.
Implementation Method 1
A transmit antenna within the combustion chamber wirelessly delivers radio frequency waves or microwaves to a receive antenna
Implementation Method 2
The receive antenna is implemented as a pair of small features inside the combustion chamber that wirelessly receive radio frequency or microwave energy and focus the energy to a spark gap, thereby producing a spark
Implementation Method 3
Focused RF/microwave energy produces a spark, which ignites a flame and is delivered directly to the flame front. The RF/microwave ignition system not only generates a wireless spark but may also generate plasma during and/or after the spark event.
Implementation Method 4
Radio frequency waves or microwaves are delivered into the combustion chamber via a wired transmit antenna
Data Source
AI summary
A method of providing spark ignition for an engine or other equipment having a combustion chamber. A radio frequency wave or a microwave (RF/microwave) generator delivers radio frequency waves or microwaves to a transmit antenna inside the combustion chamber. At least one RF/microwave receive antenna is attached to an internal surface of the combustion chamber and comprises two or more RF/microwave focusing features with a spark gap between them. The transmit antenna wirelessly energizes the receive antenna, which generates a spark between the two focusing features.