| 摘要 |
A four-stroke piston engine in which air or a fuel-air mixture is drawn into a cylinder. Fuel may be injected into the air flowing into or already present in the cylinder while a further fuel supply is located on the axis of the cylinder and supplies at least one jet of fuel during the compression stroke, which jet of fuel in cooperation with the fuel-air mixture forms at least one zone of enriched mixture within the cylinder. The piston may have a recess in the upper end into which the fuel nozzle is received when the piston approaches top dead center so that an enriched zone is formed in the recess or in the region of said recess which can be ignited by electrodes disposed adjacent the further fuel supply.
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