RF Plasma Ignition Spark Control via Real-Time Parameter Adjustment
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Solution Overview
Problem
In automobile plasma ignition systems, controlling the power supply of a multi-spark plug resonator to maximize spark volume while minimizing filamentary discharges (bridging) is challenging, as high voltage can concentrate energy in a single filament, reducing ignition effectiveness.
Innovation Solution
A method and device for controlling a radiofrequency plasma generator that adjusts the intermediate voltage, control frequency, and duration of control pulses in real-time based on engine operation and spark generation measurements to promote branched sparks, using a power supply circuit with a switch and a resonator connected to the spark plug electrodes, and a control module that regulates these parameters to prevent bridging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the voltage amplitude applied to the spark plug electrodes is increased to maximize spark volume, then the spark generation effectiveness is improved, but the risk of filamentary discharges (bridging) increases which localizes energy and reduces ignition effectiveness
Solution Approach 1:
The patent applies dynamics by making the resonator's operating frequency adjustable rather than fixed. The control module dynamically adapts the resonator's operating frequency in real-time to match optimal values that prevent bridging while maintaining effective spark generation. This dynamic adaptation resolves the contradiction by allowing the system to operate at different frequency points depending on conditions, rather than being constrained to a single fixed frequency that may promote harmful filamentary discharges at high voltages
Solution Approach 2:
The patent changes the operating parameter of the resonator from a fixed frequency to an adjustable frequency that can be optimized in real-time. By varying the operating frequency parameter, the system can avoid conditions that lead to bridging while maintaining high voltage operation for effective spark generation. The control module monitors and adjusts this parameter to resolve the contradiction between spark volume and filamentary discharge prevention
2Object-generated harmful factors
If the control frequency is adjusted away from the resonant frequency to reduce bridging, then the occurrence of filamentary discharges is reduced, but the overvoltage coefficient of the resonator decreases reducing spark effectiveness
Solution Approach 1:
The system dynamically adjusts the resonator's operating frequency based on real-time conditions rather than using a fixed frequency. The control module continuously monitors operation and adapts the frequency to optimal values that balance bridging prevention with maintaining sufficient overvoltage coefficient for effective spark generation
Solution Approach 2:
The control module implements feedback by monitoring the resonator's operation and adjusting the operating frequency based on detected conditions. This feedback mechanism allows the system to identify when bridging is occurring or likely to occur and adjust the frequency accordingly, while also maintaining awareness of the overvoltage coefficient to ensure spark effectiveness is preserved
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
The solution effectively maximizes spark volume and reduces bridging, ensuring efficient ignition by dynamically adjusting the power supply parameters to maintain optimal voltage and frequency conditions, thereby enhancing combustion initiation.
Implementation Method 1
a resonator, connected to the output of the power supply circuit and able to generate a spark between two electrodes when a high voltage level is applied to the output of the power supply circuit
Implementation Method 2
A BME comprises a resonator whose resonance frequency Fc is located in the high frequencies, typically between 4 and 6 MHz, to supply the spark plug with a voltage amplified by resonance
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a method for controlling a radio-frequency plasma generator, comprising a supply circuit (2) with a switch (9) controlled by at least one control pulse train, for applying an intermediate voltage (Vinter) at a control frequency on an output to which is connected a resonator (6) for generating a spark between two electrodes (103, 106) when a high voltage level is applied to the output, said method being characterised in that it comprises: receiving first and second measurement signals respectively representative of the operation of a combustion engine and of the type of spark generated; real-time adjusting, based on the received measurement signals, at least one parameter selected from at least the intermediate voltage level, the control frequency and the duration of the control train, in order to promote the branching of the spark generated.