초록 ▼

An improved carburetted internal combustion engine (10) which operates with an extremely lean mixture, without a conventional cooling system, and at an elevated temperature characteristic of an adiabatic engine. The engine uses two ignition sources (20, 21) symmetrically disposed about the center of

An improved carburetted internal combustion engine (10) which operates with an extremely lean mixture, without a conventional cooling system, and at an elevated temperature characteristic of an adiabatic engine. The engine uses two ignition sources (20, 21) symmetrically disposed about the center of the cylinder head, and/or a third igniting and microwave coupling means (19) at the center, to achieve extreme lean mixture combustion and relatively fast burn necessary for adiabatic engine operation. The engine incorporates other features to improve its efficiency and emissions, including engine air-throttling through controlled intake valve closure and unconventional valve timing.

대표청구항 ▼

Internal combustion engine apparatus comprising: (a) means defining at least one compression/expansion chamber, (b) a movable compression/expansion element moveable within such chamber, said parts (a) and (b) being constructed and arranged to provide cyclic compression and expansion of a combustion

Internal combustion engine apparatus comprising: (a) means defining at least one compression/expansion chamber, (b) a movable compression/expansion element moveable within such chamber, said parts (a) and (b) being constructed and arranged to provide cyclic compression and expansion of a combustion space within such chamber through regular cyclic movement of such members, (c) means for providing a very lean air and fuel mixture with an average precombustion equivalence ratio F0.75 in all but high load/acceleration conditions (d) means for admitting air and fuel to such space, (e) electrical means for igniting, combined with means for stimulating combustion of, said very lean mixture, such that on the average the real fuel ideal otto cycle mean gas ranking temperature Tg for this engine is within two thirds and four fifths that of the “conventional standard”engine (Tg�g), (f) means for exhausting combustion gas from such chamber space, (g) means for extracting work from the expansion driven movement of said moveable member and returning work for compression movement thereof, and (h) means for limiting cooling of the chamber walls adjacent to the combustion space, the apparatus as a whole being constructed and arranged to enable essentially adiabatic operation of the engine. A method for operation of an internal combustion power system of the type utilizing a multi-cylinder engine housing with pistons movable in cylinders and connected to a work-extracting drive system arranged for extracting work from the pistons in cyclic alteration on expansion strokes thereof, caused by combustion of an air/fuel mixture; and returning work to the pistons to drive them in, cyclic alternation, in compression strokes comprising the steps of: (a) controlling the air/fuel mixture to a lean condition of equivalence ratio F0.75 except under engine high load/acceleration, (b) limiting the burn time of said mixture by a factor of at least two compared to the burn time of that mixture with conventional single point spark ignition and no microwave stimulation in a similar chamber with liquid cooling, (c) retaining heat left in the combustion zone after expansion and imparting such heat from a previous expansion to air/fuel mixture admitted in a next compression step, to preheat mixture in such compression step to aid in the reduction of the burn time, except under high load/acceleration conditions.