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Optimisation of the excitation frequency of a radiofrequency plug

A radio frequency and radio technology, applied in spark ignition controller, ignition controller, engine ignition, etc.

Active Publication Date: 2011-02-23
RENAULT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, this embodiment requires the inclusion of HV probes on the resonator output, which creates serious technical problems in the case of automotive spark plugs

Method used

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  • Optimisation of the excitation frequency of a radiofrequency plug
  • Optimisation of the excitation frequency of a radiofrequency plug
  • Optimisation of the excitation frequency of a radiofrequency plug

Examples

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Embodiment Construction

[0032] The invention proposes to adapt in real time the frequency of the excitation signal supplied by the power module to the radio frequency resonator during a plasma generation command in order to maintain the maximum quality factor of the resonator, including after spark triggering.

[0033] In order to do this, the control module of the plasma generating device according to the invention contains means for determining the optimal excitation frequency, designed to adapt the setpoint frequency Fc to the resonance conditions of the device after spark formation.

[0034] According to a first embodiment, the setpoint frequency is set at a value lower than the resonant frequency of the non-sparking resonator in order to maintain a maximum quality factor after triggering the spark. The choice is therefore made that, according to this embodiment, the radio frequency power module of the resonator is pre-tuned to a frequency lower than the resonance frequency of the non-sparking res...

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Abstract

The invention relates to a device for generating a radiofrequency plasma, which comprises a supply module (20) applying, on an output interface, an excitation signal (U) at a setpoint frequency (Fc), adapted for generating a spark (40) at the output of a plasma-generation resonator (30) connected to the output interface of the power module, and a control module (10) supplying the setpoint frequency to the power module upon a command for generating the radiofrequency plasma, wherein said device is characterised in that the control module includes a means for determining an optimal excitation frequency, capable of adapting the setpoint frequency (Fc) to the resonance conditions of the device after formation of the spark.

Description

technical field [0001] The present invention relates generally to radio frequency plasma spark plugs for use in combustion chambers of internal combustion engines for automotive ignition applications. The invention relates in particular to the operation of such a radio-frequency high-voltage power supply for spark plugs, which is based on the phenomenon of resonance in the RLC circuit, the resonance frequency being determined by the intrinsic parameter values ​​of the spark plug. Background technique [0002] figure 1 A plasma generating device is shown. This device has a plasma generating resonator 30 which represents the first subsystem of the radio frequency spark plug and contains a series resistor R whose value is set during manufacture by the nature and geometry of the materials used 0 , inductor L 0 and capacitor C 0 , so the resonator has a resonant frequency higher than 1MHz. [0003] The device also has a radio frequency power supply module 20 which applies an...

Claims

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Application Information

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IPC IPC(8): F02P9/00
CPCF02P9/007F02P23/04
Inventor M·马卡罗夫F·奥扎斯
Owner RENAULT SA
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