Ignition Module Dynamic Coil Switching for Engine Speed
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Solution Overview
Problem
Capacitive discharge ignition (CDI) systems face challenges in providing sufficient ignition voltages at both low and high engine speeds due to the higher inductance and resistance characteristics of charge coils, which hinder their ability to power electrical devices effectively across a wide range of engine speeds.
Innovation Solution
The proposed solution involves an ignition module with a charge coil, an ignition capacitor, a first switching device, and an electronic processing device that uses a flyback charging technique to charge the capacitor at lower engine speeds and a non-flyback technique to power additional electrical devices at higher engine speeds, allowing for efficient energy induction and distribution across a wide engine speed spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If charge coils with higher inductance and resistance characteristics are used, then high voltage can be produced at lower engine speeds, but the ability to power electrical devices at higher engine speeds is hindered
Solution Approach 1:
The patent implements dynamic switching between two charge coils based on engine speed. At low speeds, the high inductance coil is activated to generate high ignition voltage. At high speeds, the low inductance coil is activated to provide high current for electrical devices. This dynamic adaptation resolves the contradiction by allowing the system to optimize its characteristics for different operating conditions rather than being fixed.
Solution Approach 2:
The patent changes the inductance and resistance parameters of the charge coil configuration based on engine speed. By switching between coils with different inductance values, the system adjusts its electrical characteristics to match the required performance at different speeds, thereby resolving the contradiction between high voltage generation and electrical device powering capabilities.
2Device complexity
If a single charge coil configuration is used, then the system is simple, but it cannot provide sufficient ignition voltages at both low and high engine speeds
Solution Approach 1:
The patent divides the charge coil function into two separate coils with different characteristics: one optimized for high inductance at low speeds and another for low inductance at high speeds. This segmentation allows each coil to be optimized for its specific operating range, improving overall reliability while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent creates a multi-functional charge coil system where two coils work together to provide both high voltage ignition and high current electrical device powering across different engine speeds. The electronic processing device coordinates both coils, making the system universal enough to handle multiple functions and speed ranges effectively.
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 approach enables the ignition module to generate both high voltage and high current efficiently across a broad range of engine speeds, improving spark ignition voltage at lower speeds and power output at higher speeds, while reducing the number of parts, weight, and expense.
Implementation Method 1
inducing electrical energy in a charge coil
Implementation Method 2
charging the ignition capacitor according to a flyback charging technique
Data Source
AI summary
A capacitive discharge ignition (CDI) system that can be used with a variety of light-duty internal combustion engines, including those typically employed by lawn, garden, and other outdoor equipment. According to one embodiment, the CDI system includes an ignition module having a first switching device that shorts a charge coil during an initial portion of a charge cycle. Subsequently, the first switching device is turned ‘off’ so that a flyback charging technique charges an ignition capacitor. A second switching device is then used to discharge the ignition capacitor and initiate the combustion process.