Pulse-actuated fuel-injection spark plug. [Patent application]

Patent · Fri Oct 22 00:00:00 EDT 1976

OSTI ID:5449811

Murray, I; Tatro, C A

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 is described. 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.

• Assignee: Energy Research and Development Administration
• OSTI ID: 5449811
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
STRATIFIED CHARGE ENGINES
FUEL INJECTION SYSTEMS
IGNITION SYSTEMS
DESIGN
FUEL-AIR RATIO
PUMPS
SPARK GAPS
VALVES
CONTROL EQUIPMENT
ENGINES
FLOW REGULATORS
FUEL SYSTEMS
INTERNAL COMBUSTION ENGINES
330603* - Vehicle Design Factors- Engine System
330101 - Internal Combustion Engines- Spark-Ignition