| 摘要 |
A method of operating an internal combustion engine having one or a plurality of cylinders with piston means movable therein wherein a controlled quantity of compressed air is introduced into the combustion chamber when the piston is substantially in its bottom dead center position and about to begin a compression stroke or an exhaust stroke or only before the beginning of an exhaust stroke. The quantity of compressed air supplied is varied in dependence upon the load or output power of the engine. At lower engine speeds or lower output power a greater quantity of compressed air is introduced before each compression stroke. At higher engine speeds or higher output power a smaller quantity of compressed air is supplied prior to each compression stroke and each exhaust stroke. The scavenging and/or supercharging air is supplied at a pressure from about 7 to 43 psig, and at a temperature below 1470 DEG F., or lower. In a multi-cylinder engine each cylinder may have beneath its piston a closure arrangement with valve means so that the volume between the piston and the closure functions as a compression chamber for supplying compressed air into the combustion chambers through associated conduits including valve means controlled by the engine. Alternately, a separate source of compressed air such as a compressor may be provided and connected through a valve assembly to the respective cylinders. The valve assembly is driven by the engine crank shaft and may be controlled by the accelerator pedal or a control lever of the engine.
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