Renault S.a.s.

Excico Group

Excico Group Nv

Maxime Makarov

Xavier Jaffrezic

Marc Pariente

Nadim Malek

Franck Deloraine

Frederic Auzas

Menouar Ameziani

Frédéric Auzas

Marc Stehle

Marc Mestres

Kahina Bouamra

André Agneray

A spark plug including: a central electrode including an upper end and a lower end; an insulating part including an upper portion and a lower portion and surrounds the central electrode so that the lower end of the central electrode extends beyond the lower portion of the insulating part; and a cap including an upper portion and a lower portion that has an end section and that surrounds the insulating part so that the lower portion of the insulating part extends beyond the lower portion of the cap. The insulating part includes an annular groove, on the external periphery thereof, on the lower end of the cap, and the lower end section of the cap is placed in the groove.

Short-circuit prevention in an RF spark plug

A method for controlling the power supply of a radiofrequency spark plug in an internal combustion engine up to an electric voltage sufficient for generating a highly branched spark. To this end, the electric voltage for powering the spark plug is increased step by step up to an adequate voltage adapted for ignition.

Power supply control for spark plug of internal combustion engine

The invention relates to a pumped electron source () that includes an ionization chamber (), an acceleration chamber () with an electrode () for extracting and accelerating primary ions and forming a secondary-electron beam, characterized in that the pumped electron source () includes a power supply () adapted for applying to the electrode () a positive voltage for urging a primary plasma () outside the acceleration chamber (), and a negative voltage pulse for extracting and accelerating the primary ions and forming a secondary-electron beam.

Pulsed electron source, power supply method for pulsed electron source and method for controlling a pulsed electron source

The power supply device () for an ion-bombardment-induced secondary-emission electron source in a low-pressure chamber includes a control input, two high-voltage outputs, an element for generating a plurality of positive pulses on a high-voltage output, and an element for generating a negative pulse on the other high-voltage output after at least some of the positive pulses.

Device and method of supplying power to an electron source, and ion-bombardment-induced secondary-emission electron source

A device for generating a radiofrequency plasma, which includes a supply module applying, on an output interface, an excitation signal at a setpoint frequency, adapted for generating a spark at the output of a plasma-generation resonator connected to the output interface of the power module, and a control module supplying the setpoint frequency to the power module upon a command for generating the radiofrequency plasma. The control module is configured to determine an optimal excitation frequency, to adapt the setpoint frequency to the resonance conditions of the device after formation of the spark.

Optimization of the excitation frequency of a radiofrequency plug

A method of igniting a mixture of oxidant and fuel in a combustion chamber of a combustion engine using a spark plug arranged so that it protrudes into the combustion chamber of the engine. The method includes powering the spark plug using a first alternating electrical signal of a frequency higher than 1 MHz, and second powering the spark plug using a second alternating electrical signal of a frequency higher than 1 MHz, the second power taking place after the first powering following a time delay.

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Viroflay, France

Maxime Makarov