Ignition Coil Transformer Segmentation for Extended Firing Period
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Solution Overview
Problem
Conventional ignition devices for internal-combustion engines suffer from high energy consumption in transformers, leading to short firing periods and reduced combustion efficiency, causing excessive wear and poor fuel combustion.
Innovation Solution
The ignition device incorporates a transformer with a first, second, and energy superimposing winding, a drive device that controls the switches to manage current flow, and a DC-DC converter to extend the secondary current supply period and maintain constant power, reducing energy consumption and improving combustion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional transformer with large turns ratio is used to generate high voltage on secondary side, then high voltage output is achieved, but energy consumption increases and firing period shortens
Solution Approach 1:
The patent divides the single transformer into two separate transformers: a first transformer for voltage conversion and a second transformer for energy storage and extended current supply. This segmentation allows the system to achieve both high voltage output and extended firing period by independently optimizing each transformer's function.
Solution Approach 2:
The patent combines the functions of voltage conversion and energy storage by connecting two transformers in parallel to the plug. The first transformer provides high voltage while the second transformer extends the current supply period, achieving both goals simultaneously through functional merging.
2Duration of action of moving object
If excessive power is supplied to the plug to extend firing period, then combustion efficiency improves, but the plug wears out easily
Solution Approach 1:
The patent segments the power supply function by using two separate transformers: one dedicated to voltage conversion and another to current extension. This allows the system to extend firing period without concentrating excessive power in a single component, thereby protecting the plug from excessive wear.
Solution Approach 2:
The second transformer acts as an intermediary that extends the current supply period without directly increasing the power load on the plug. It provides additional energy storage capacity that prolongs the firing period while maintaining safe power levels at the plug.
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 extends the firing period of the plug, enhances fuel combustion efficiency, prevents excessive wear, and maintains constant plug current and voltage, thereby improving engine performance.
Implementation Method 1
an ignition coil including a first winding, a second winding, and a third winding that are electromagnetically coupled to each other
Data Source
AI summary
An ignition coil includes a first winding, a second winding, and a third winding. A first switch is electrically connected to the first winding. A battery is electrically connected to the first winding. A booster is electrically connected to the battery. A second switch is electrically connected to the third winding. A drive device drives the first switch and the second switch. The drive device turns the first switch from on-state to off-state to allow a secondary current to flow through the second winding, turns the second switch from off-state to on-state to supply an output of the booster to the third winding, and superimpose a second current to the second winding. When a third winding current becomes equal to or greater than a predetermined value, the booster controls such that power generated by the third winding current and an output voltage of the booster is restricted to constant power.