Ignition Device Yoke Magnet Geometry for Power Output
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Solution Overview
Problem
The existing transistor ignition device with timing advance has a limited advance range, which restricts the increase in output power and fuel efficiency of internal combustion devices, leading to decreased output power.
Innovation Solution
An ignition device with a core and yokes positioned around a flywheel, featuring a primary and secondary coil, an ignition drive circuit, a control circuit, and a power circuit with a booster section, where the yoke end width to magnet width ratio is between 60% to 100% and the magnet width to yoke interval ratio is between 95% to 100%, allowing for enhanced output power and startability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transistor ignition device with timing advance is used to reduce peak current value at high engine rpm, then spark energy is kept constant during high speed rotation, but the advance range is limited and output power decreases
Solution Approach 1:
The patent changes the magnetic circuit geometry parameters (yoke end width, magnet width, yoke interval) to optimize the magnetic flux distribution. By setting the yoke end width to 60-100% of magnet width and magnet width to 95-100% of yoke interval, the device achieves both wide advance range and sufficient spark energy across all engine speeds
Solution Approach 2:
The patent enables dynamic ignition timing control across a wide range by optimizing the magnetic circuit to provide sufficient induced voltage even at low engine speeds, allowing the ignition system to adapt timing advance dynamically from idle to high rpm operations
2Power
If the yoke end width to magnet width ratio is optimized to 60%-100% and magnet width to yoke interval ratio to 95%-100%, then output power and startability are improved, but the device complexity increases
Solution Approach 1:
The patent defines specific parameter ranges (yoke end width 60-100% of magnet width, magnet width 95-100% of yoke interval) that optimize performance while maintaining manufacturing feasibility. These parameter specifications provide clear design guidelines that balance performance improvement with manufacturing simplicity
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 increases the output power of internal combustion devices while improving startability, ensuring a wide advanced angle range and secure sub voltage, even during low speed rotations, by utilizing a booster section within the power circuit to drive the control circuit effectively.
Implementation Method 1
an ignition drive circuit configured to cause a primary current to flow in the primary coil using a primary voltage induced in the primary coil
Implementation Method 2
shuts off the primary current to induce a secondary voltage for ignition in the secondary coil
Data Source
AI summary
In an ignition device, a proportion of a yoke end width defined as a distance from one end to another end of an end portion of each of a pair of yokes in the circumferential direction to a magnet width defined as a distance from one end to another end of a permanent magnet disposed on the outer circumferential surface of a flywheel, in the circumferential direction is in a range of 60% to 100%. Moreover, a proportion of the magnet width to a yoke interval between the pair of yokes is in a range of 95% to 100%.