Direct current ignition system

Details Direct current ignition system Direct current ignition system

1991-06-28

1993-01-12

Nelli, Raymond A.

Internal-combustion engines

High tension ignition system

Using capacitive storage and discharge for spark energy

123596, 315209CD, F02P 306

Patent

active

051781204

ABSTRACT:
This invention discloses a system for initiating and enhancing combustion of fuel and fuel-air mixtures by discharging electrical energy in a spark gap. The energy to breakdown the spark gap is supplied by a high voltage direct current source which supplies a voltage high enough to cause initiation of the spark without the need for an intermediate transformer. Control of the high voltage is by way of a semiconductor switch, which is preferably a bulk photoconductive switch. Such a switch is capable of withstanding the high voltage applied across it when it is switched off. There may also be provided a further source of high voltage which supplies energy to the spark gap at a lower voltage then the first source after the spark has been initiated. Thus the length of time the spark lasts for may be controlled. This is particularly useful for use with lean fuel mixtures for fuel economy or with diluted fuel mixtures diluted through exhaust gas recirculation for reduced emissions.

REFERENCES:
patent: 4886036 (1989-12-01), Johansson et al.
patent: 4967718 (1990-11-01), Scarnera
patent: 5049786 (1991-09-01), Gotisar et al.
patent: 5060623 (1991-10-01), McCoy

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