Capacitor Discharge Ignition Coil Spacing and Terminal Merging
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Solution Overview
Problem
Conventional engine ignition devices experience reduced ignition performance due to the influence of induced voltage from the exciter coil on the ignition coil, and the separate terminal positions of these coils complicate assembly and soldering operations, reducing efficiency and increasing costs.
Innovation Solution
A capacitor discharge engine ignition device with a coil unit comprising an ignition coil and an exciter coil wound around a common core, where the coils are axially spaced to reduce mutual inductance and have terminals collectively connected to a circuit board, facilitating efficient assembly and maintaining high ignition voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the exciter coil and ignition coil are wound around a common core, then the device complexity is reduced and construction is compact, but the induced voltage of the ignition coil is influenced by the exciter coil, reducing the high voltage for ignition and worsening ignition performance
Solution Approach 1:
The coil unit is divided into an exciter coil assembly and an ignition coil assembly that are wound around different portions of the core. The core is segmented into a first core portion for the exciter coil and a second core portion for the ignition coil, with magnetic pole portions positioned at opposite ends. This segmentation prevents magnetic interference while maintaining a compact single-unit construction.
2Ease of manufacture
If the exciter coil and ignition coil terminals are provided in different axial positions, then the coil winding structure is simplified, but the assembly and soldering operations become complicated and productivity is reduced
Solution Approach 1:
The terminals of both the exciter coil and ignition coil are collectively provided at the same axial position, specifically at one axial end of the coil unit. This merging of terminal positions allows all electrical connections to be made at a single location, simplifying assembly and soldering operations while maintaining the segmented winding structure for optimal performance.
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 spacing between the coils prevents a reduction in high voltage induced in the ignition coil's secondary coil, improving ignition performance and simplifying the assembly process by reducing the complexity of terminal connections.
Implementation Method 1
an exciter coil that is wound around the core and induces an AC voltage in synchronization with rotation of the engine
Implementation Method 2
A significant change in magnetic flux that occurs in a core when the discharge current flows induces a high voltage for ignition in a secondary coil of the ignition coil
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A capacitor discharge ignition device (2) in which a coil unit (4) including an ignition coil (IG) and an exciter coil (EX) wound around a common core, and an ignition unit (5) including a circuit board (501) and components of an ignition circuit mounted to the circuit board are housed in a case (6) and molded with resin (7) poured into the case, wherein the ignition coil and the exciter coil are placed axially with a spacing therebetween and a space (SP) is formed between the coils, the circuit board (501) of the ignition unit is placed on a lateral side of the coil unit, and terminals for connecting the ignition coil and the exciter coil to the circuit board are all connected to the circuit board through the space (SP) between the ignition coil (IG) and the exciter coil (EX).