Plasma ignition system for an internal combustion engine

Details Plasma ignition system for an internal combustion engine Plasma ignition system for an internal combustion engine

1982-09-29

1985-04-16

Argenbright, Tony M.

Internal-combustion engines

High tension ignition system

Additional spark energy supply

123143B, 123643, F02P 308

Patent

active

045109150

ABSTRACT:
An N cylinder internal combustion engine plasma ignition system comprises a DC-DC converter for boosting low DC voltage to high DC voltage. Each of N ignition energy charging circuits includes a first capacitor connected between the DC-DC converter and ground via first and second diodes. The capacitor is charged by the DC-DC converter. Each of N reverse blocked thyristors connected to a junction of the first diode and first capacitor selectively grounds an electrode of the corresponding first capacitor to discharge ignition energy stored in the first capacitor. For each cylinder a transformer connected between the first capacitor and a spark plug boosts and feeds the discharged energy to the plug. One end of the transformer primary winding is grounded via a second capacitor to generate a damped oscillation when the corresponding thyristor grounds the first capacitor. An ignition trigger signal generator sequentially triggers the corresponding thyristor in a predetermined ignition order whenever the engine revolves through a predetermined angle and supplies a pulse to the DC-DC converter in synchronization with the ignition trigger signal. Derivation of the high DC voltage is halted for a period of time according to the pulsewidth. Each of N core-less inductors connected in series with the secondary winding of a transformer restricts an abrupt large current flow from the corresponding spark plug, to extend the discharge duration of each spark plug and ignite the air-fuel fixture stably without misfire.

REFERENCES:
patent: 3939814 (1976-02-01), Bergstresser
patent: 4029072 (1977-06-01), Goto et al.
patent: 4366801 (1983-01-01), Endo et al.
patent: 4369756 (1983-01-01), Ezoe
patent: 4398526 (1983-08-01), Hamai et al.
patent: 4418660 (1983-12-01), Endo et al.
patent: 4441479 (1984-04-01), Endo et al.

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