Ignition Device Shielding Part Phase Synchronization
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Solution Overview
Problem
Existing ignition devices for internal combustion engines with step-up transformers face challenges in achieving sufficient resonance gain of secondary voltage due to phase shifts between induced magnetic flux and secondary voltage, leading to inefficient electrical discharge.
Innovation Solution
An ignition device with a step-up transformer where the second end of the secondary winding is electrically connected to a shielding part made of conductive material, ensuring synchronized phases of induced voltage and secondary voltage, thereby enhancing resonance and discharge efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding part is provided to block leakage magnetic flux from the gap, then electromagnetic noise is suppressed and induced magnetic flux is generated, but phase shift between induced voltage and secondary voltage prevents effective resonance
Solution Approach 1:
The shielding part is electrically connected to one end of the secondary winding, establishing equipotential between them. This eliminates the phase shift between induced voltage and secondary voltage by ensuring they share the same reference potential, thereby enabling effective resonance while maintaining electromagnetic noise suppression
Solution Approach 2:
The electrical connection between the shielding part and secondary winding acts as an intermediary that synchronizes their potentials. This connection mediates the relationship between the shielding function and resonance function, allowing both to coexist effectively
2Speed
If a gap is provided in the core to increase self-resonant frequency of secondary winding, then resonance frequency is improved, but magnetic flux leaks from gap causing reduced resonance gain and electromagnetic noise
Solution Approach 1:
The leakage magnetic flux from the gap, which was previously harmful causing energy loss and electromagnetic noise, is converted into a beneficial effect. The shielding part captures this leakage flux and generates induced magnetic flux that returns to the core, transforming the harmful leakage into useful flux that enhances resonance gain
Solution Approach 2:
The shielding part serves as an intermediary that intercepts leakage magnetic flux from the gap and redirects it back to the core. This intermediary structure prevents energy loss while maintaining the high self-resonant frequency enabled by the gap
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 allows for effective resonance of the secondary voltage, resulting in a higher secondary voltage and easier spark plug discharge, while also reducing electromagnetic noise and power consumption.
Implementation Method 1
when the leakage magnetic flux is blocked by the shielding part, an induced voltage is generated in the shielding part and a current flows, resulting in the generation of magnetic flux
Implementation Method 2
a high secondary voltage is generated by making use of the resonance phenomenon caused by the leakage inductance of the secondary winding and the stray capacitance parasitic to the leakage inductance
Data Source
AI summary
A step-up transformer, an oscillator, and an ignition plug are comprised. The step-up transformer has a primary winding, a secondary winding, and a core. The ignition plug is connected to a first end of the secondary winding. A gap is formed in the core. The step up transformed is provided with a shielding part which is made of a conductive material and shields the magnetic flux leaking from the gap. A second end of the secondary winding is electrically connected to the shielding part.