Dual-Coil Ignition System for Continuous Spark Control
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Solution Overview
Problem
Existing multi-charge ignition systems for lean air-fuel mixtures in internal combustion engines face issues with spark interruption during recharge periods, leading to misfire, increased fuel consumption, and emissions, particularly under high turbulences, and require additional components like step-down converters.
Innovation Solution
The ignition system eliminates the step-down converter stage by using switches Q1 and Q2 to control the primary and secondary currents, limiting the maximum input current and maintaining a constant energy level in the transformers, thereby providing a continuous spark without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a step-down converter stage is used to limit maximum input current, then current limiting is achieved, but device complexity increases due to additional components
Solution Approach 1:
The invention extracts and eliminates the step-down converter stage from the ignition system, removing the transistor switch and diode components while maintaining current limiting functionality through alternative control mechanisms that reduce overall system complexity
Solution Approach 2:
The ignition coils are designed to perform multiple functions: they serve as both the energy storage inductors and the current limiting elements, eliminating the need for separate step-down converter components by making the existing components multi-functional
2Duration of action of moving object
If multi-charge ignition systems are used to increase spark duration, then spark energy output is improved, but spark interruption occurs during recharge periods leading to misfire
Solution Approach 1:
The invention implements a coupled-multi-charge operation mode where two ignition coils work in coordinated alternation, ensuring that one coil is always in the discharge phase while the other charges, thereby eliminating gaps in spark generation and maintaining continuous ignition during high turbulence conditions
Solution Approach 2:
The system uses periodic switching between two ignition coils with precisely timed charge and discharge cycles, creating a continuous sequence of sparks that maintains ignition continuity while allowing each coil sufficient recharge time
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 solution reduces the number of components, enhances the stability of the ignition system, and minimizes misfires, resulting in improved fuel efficiency and reduced emissions by maintaining a consistent energy delivery to the spark plug.
Implementation Method 1
The voltage and wound on a common core K1 forming a first transformer and secondary windings L3, L4 wound on another common core K2 are forming a second transformer
Implementation Method 2
provide a continuous spark, such as a multi-spark plug ignition system
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
An ignition system including a spark plug control unit adapted to control at least two stages comprising a first transformer (T1) including a first primary winding (L1) inductively coupled to a first secondary winding (L2); a second transformer (T2) including a second primary winding (L3) inductively coupled to a second secondary winding (L4); said control unit enabled to simultaneously energize and deenergize primary windings (L1, L3) by simultaneously switching on and off two corresponding switches (Q1, Q2) to maintain a continuous ignition fire, wherein means to implement operation is based solely on selective switching of switches Ql and Q2.