Fuel delivery system for hand-held two-stroke cycle engines

Details Fuel delivery system for hand-held two-stroke cycle engines Fuel delivery system for hand-held two-stroke cycle engines

1996-10-04

1997-11-04

Okonsky, David A.

Internal-combustion engines

Two-cycle

Rear compression

123 73C, F02B 3304

Patent

active

056828454

ABSTRACT:
An improved fuel delivery system, method and apparatus providing a hybrid carburetor and direct fuel injection system, utilizing the best of each for different engine operational modes to thereby meet emission requirements for small hand-held two-cycle engines using standard two-stroke gasoline and oil premix fuel. A diaphragm carburetor and associated diaphragm fuel pump operates alone to supply a proper A/F idle mixture sufficient only for engine power at start-up idle and off idle (light load). This engine aspiration carburetor fuel delivery system is operated continuously, and then at part (off idle-light load) and wide open throttle (W.O.T) the same is combined with operation of a direct cylinder fuel injection system, using a second stage pressure boost peristaltic type pump and fuel injector nozzle, that is engine self-regulated and driven to operate only at part-throttle and W.O.T. to thereby supply most of the engine fuel demand in these operational ranges. The remaining engine fuel requirement is satisfied by continuing delivery of the engine crankcase/carburetor aspirated idle air/fuel/oil mixture, which thus also provides engine lubrication under all operational conditions.

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