Ignition Device Combining Discharge and AC Power for Misfire Prevention
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Solution Overview
Problem
Existing ignition devices for internal combustion engines face issues with misfire due to inadequate voltage output, particularly when using AC power, leading to inefficient power increases and electrode erosion.
Innovation Solution
The ignition device incorporates a configuration with a high-voltage electrode and an AC electrode, connected via a capacitor and insulator, which supplies both secondary voltage and AC power to the ignition plug, preventing misfire by ensuring reliable voltage and power delivery, and utilizing ceramic or composite insulators for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AC power is increased to prevent misfire, then reliability improves, but power efficiency deteriorates because output increases in proportion to the square of AC power
Solution Approach 1:
The patent combines two power sources: a discharge power supply that generates high voltage through an ignition coil, and an AC power supply that provides high-frequency AC power. By merging these two different power sources, the system achieves reliable spark generation without requiring excessive AC power, thus maintaining efficiency while preventing misfire.
Solution Approach 2:
The patent uses a composite insulator structure combining ceramic and resin materials. The ceramic portion provides high-temperature resistance and dielectric strength, while the resin portion provides sealing and mechanical support. This composite approach allows the system to handle the combined high voltage and AC power without excessive energy loss.
2Reliability
If AC power is increased to prevent misfire, then reliability improves, but electrode durability deteriorates due to increased erosion
Solution Approach 1:
By combining discharge power supply and AC power supply, the system achieves reliable ignition without relying solely on high AC power, thereby reducing electrode erosion and extending durability.
Solution Approach 2:
The patent changes the operational parameters by introducing high-frequency AC power (50kHz-100MHz) in addition to the traditional high voltage discharge. This parameter change allows for more efficient spark generation that reduces electrode stress and erosion.
3Device complexity
If only AC power is used to generate sparks, then device complexity is reduced, but reliability deteriorates due to voltage output failure under certain conditions
Solution Approach 1:
The patent merges discharge power supply and AC power supply systems, combining the reliability of high voltage generation with the efficiency of high-frequency AC power to ensure consistent spark generation under all operating conditions.
Solution Approach 2:
The patent introduces a capacitor as an intermediary element that couples the AC power supply to the ignition plug. This capacitor allows the AC power to be effectively transferred while working in conjunction with the discharge power supply system, ensuring reliable operation.
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 configuration significantly improves ignition performance by reliably generating sparks, reducing misfire occurrences, and maintaining long-term durability through effective voltage and power supply management and material selection.
Implementation Method 1
an ignition coil which includes a primary coil and a secondary coil and which is adapted to generate a high secondary voltage in the secondary coil by stepping up a voltage applied to the primary coil
Implementation Method 2
a capacitor composed of the AC electrode, the high-voltage electrode, and the insulator
Implementation Method 3
an insulator disposed between the high-voltage electrode and the AC electrode and disposed between the first and second auxiliary electrode plates
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
An ignition device (100) includes a power supply (2) for discharge; an AC power supply (3); an ignition coil (41) for generating a secondary voltage in a secondary coil (41B); an ignition plug (1) connected to the secondary coil (41B); an AC electrode (43) electrically connected to the AC power supply (3); a high-voltage electrode (42) located between the secondary coil (41B) and the ignition plug (1); an insulator (44) located between the two electrodes (42, 43); and a second insulator (47) which covers the ignition coil (41) and a capacitor (49) composed of the two electrodes (42, 43) and an insulator (44). The secondary voltage and AC power are supplied to the ignition plug (1) via the high-voltage electrode (42). Thus, excellent ignition performance can be implemented while the occurrence of misfire is restrained.