Pulse-actuated fuel-injection spark plug

Details Pulse-actuated fuel-injection spark plug Pulse-actuated fuel-injection spark plug

1976-10-22

1978-06-20

Cox, Ronald B.

Internal-combustion engines

Noncompression

123 32JV, 123 32AE, F02D 300

Patent

active

040955800

ABSTRACT:
A replacement spark plug for reciprocating internal combustion engines that functions as a fuel injector and as a spark plug to provide a "stratified-charge" effect. The conventional carburetor is retained to supply the main fuel-air mixture which may be very lean because of the stratified charge. The replacement plug includes a cylindrical piezoelectric ceramic which contracts to act as a pump whenever an ignition pulse is applied to a central rod through the ceramic. The rod is hollow at its upper end for receiving fuel, it is tapered along its lower length to act as a pump, and it is flattened at its lower end to act as a valve for fuel injection from the pump into the cylinder. The rod also acts as the center electrode of the plug, with the spark jumping from the plug base to the lower end of the rod to thereby provide spark ignition that has inherent proper timing with the fuel injection.

REFERENCES:
patent: 2795214 (1957-06-01), Shook
patent: 3418980 (1968-12-01), Benson
patent: 3926169 (1975-12-01), Leshner et al.
patent: 3980061 (1976-09-01), McAlister

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