Internal combustion engine combustion chamber pressure sensing a

Details Internal combustion engine combustion chamber pressure sensing a Internal combustion engine combustion chamber pressure sensing a

1983-09-09

1985-01-01

Dolinar, Andrew M.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

123594, 73 35, 73115, F02P 1700

Patent

active

044911106

ABSTRACT:
To obtain higher current yield from ion current measurable across the electrodes of a spark plug upon application of a biasing potential thereto, occurring immediately after an ignition event due to ionization of burning hydrocarbons within the combustion chamber of an internal combustion engine (ICE), the polarity of the circuit including a spark plug is so selected that the smaller one of the electrodes, typically the center electrode of the spark plug, has a positive measuring voltage and positive ignition voltage applied thereto so that the positively charged ions, which have a substantially greater mass than the electrons, will be caused to flow to the negatively charged substantially greater electrode, thus resulting in an enhanced ion current. A standard automotive ignition circuit can be used, with the battery connected, as customary, with negative-ground (FIG. 3) by reversely connecting the secondary of the ignition coils--with respect to customary connection--to the center electrode of the spark plug. An auxiliary biasing battery can be avoided by charging a capacitor, for example from the ignition system, to provide measuring energy.

REFERENCES:
patent: 3035224 (1962-05-01), Whaley et al.
patent: 4232545 (1980-11-01), Dobler et al.
patent: 4233943 (1980-11-01), Rogora et al.
patent: 4359893 (1982-11-01), Kizler et al.

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