Variable Discharge Ignition Coil Optimizes Spark Energy
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Solution Overview
Problem
Existing ignition systems for motor vehicle combustion engines face challenges in generating efficient sparks due to incomplete discharging of the primary coil, leading to energy inefficiencies and delays between spark cycles.
Innovation Solution
The method involves an electronic control unit that adjusts the discharge duration of the primary coil into the secondary coil based on measured current values, optimizing the energy supplied by each spark and improving spark timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the discharge time is increased to ensure complete discharging of the primary coil into the secondary coil, then the energy transmitted is maximized, but a delay is generated between the end of discharge and the start of charging of the next cycle
Solution Approach 1:
The patent applies dynamics by making the discharge time variable rather than fixed. The electronic control unit adjusts the discharge time dynamically based on the charging state of the primary coil, allowing optimization of both energy transmission and spark cycle frequency. This resolves the contradiction by adapting the discharge duration to actual system conditions rather than using a static time parameter.
Solution Approach 2:
The patent implements feedback through the electronic control unit that monitors the charging state of the primary coil and uses this information to control the discharge time. The smart transformer measures current in both primary and secondary coils, providing feedback that enables the control unit to optimize the discharge duration for maximum energy transfer while minimizing delays between spark cycles.
2Productivity
If the discharge time is kept short to generate sparks close together, then the spark frequency is increased, but the energy transmitted is not maximum and incomplete sparks are generated
Solution Approach 1:
The patent makes the discharge time dynamic rather than fixed, allowing it to be optimized for each charging cycle. This enables the system to generate sparks at high frequency while ensuring each spark receives sufficient energy for complete combustion, resolving the contradiction between spark frequency and energy transmission efficiency.
Solution Approach 2:
The patent changes the parameter of discharge time from a fixed value to a variable parameter that is adjusted based on the charging state of the primary coil. This parameter change allows the system to optimize both spark frequency and energy transmission by adapting the discharge duration to match the available energy in each cycle.
3Loss of energy
If a smart transformer is used to measure current and optimize discharge timing, then energy transmission is optimized, but the device complexity and cost increase
Solution Approach 1:
The patent makes the transformer multi-functional by using it both for its traditional voltage transformation purpose and for measurement purposes. The smart transformer measures current in both primary and secondary coils while simultaneously performing voltage transformation, eliminating the need for separate measurement devices and reducing overall system complexity despite the enhanced functionality.
Solution Approach 2:
The smart transformer performs self-measurement of currents in both coils, eliminating the need for external measurement devices. The transformer uses its own internal capabilities to monitor and optimize the ignition process, reducing device complexity while maintaining energy transmission efficiency.
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 enhances the efficiency of spark generation, ensuring maximum energy transfer and reducing delays between spark cycles, thereby improving the overall performance of the combustion engine.
Implementation Method 1
the primary coil charges, and then discharges into the secondary coil. More specifically, a spark is generated by the spark plug at the moment of the discharge into the secondary coil
Data Source
AI summary
A method for igniting a motor vehicle combustion engine is implemented by an electronic control unit of an ignition circuit of a motor vehicle combustion engine, the ignition circuit including a transformer, including a primary coil and a secondary coil, and a spark plug electronically connected to the secondary coil of the transformer, the primary coil being capable of charging, and capable of discharging into the secondary coil, the discharge duration of the primary coil being predefined, the spark plug being capable of generating a spark during the discharging of the primary coil into the secondary coil, the method including: a) a step of requesting to start a combustion cycle of the engine; a first phase referred to as “generating a main spark”; and c) a second phase referred to as “generating at least one subsidiary spark”.