Ignition apparatus for an internal combustion engine

Details Ignition apparatus for an internal combustion engine Ignition apparatus for an internal combustion engine

1992-10-13

1993-06-01

Wolfe, Willis R.

Internal-combustion engines

High tension ignition system

Additional spark energy supply

123597, 123604, 123623, 123656, F02P 308

Patent

active

052150666

ABSTRACT:
An LCDI-type ignition apparatus for an internal combustion engine includes first and second capacitors connected to an ignition coil and a voltage source for generating a charging voltage for the capacitors. The first capacitor is for producing an initial discharge of a spark plug, and the second capacitor is for lengthening the discharge of the spark plug after discharge has been initiated by the first capacitor. In one form of the invention, the second capacitor is charged only after the first capacitor has been charged by the voltage source to a prescribed voltage sufficient to produce a suitable discharge of the spark plug. As a result, even when the engine is operating at a high rotational speed and the time between consecutive firings of the engine is small, an adequate ignition voltage can be obtained. In another form of the invention, the charging voltage(s) of one or both of the capacitors is or are varied in accordance with the one or more engine operating conditions. Each charging voltage can be controlled to the minimum necessary value based on the present engine operating conditions.

REFERENCES:
patent: 4122816 (1978-10-01), Fitzgerald et al.
patent: 4293797 (1981-10-01), Gerry
patent: 4733646 (1988-03-01), Iwasaki
patent: 4782242 (1988-11-01), Kovacs
patent: 5163411 (1992-11-01), Koiwa et al.

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