Patent ID: 8443788

Claim:
A four-stroke internal combustion engine comprising: at least one cylinder with a cylinder head and at least one camshaft, a pressure circulation lubrication, a small-capacity compressor configured to charge air, the small capacity compressor comprising a cylinder capacity having a smaller dimension than a single-cylinder capacity of the internal combustion engine, such that only a fraction of a charge of the single cylinder capacity is additionally supercharged for an operating cycle of the internal combustion engine, and the small capacity compressor also comprising at least one cylinder with an associated piston and an associated cylinder head, the small-capacity compressor conveying air and cooperating with at least one short-stroke re-charging valve, at least one inlet channels each including an inlet valve and at least one re-charging channel each including said at least one short-stroke re-charging valve, the at least one re-charging channel and the at least one short-stroke re-charging valve arranged at each of the at least one re-charging channels being separate from other inlet channels of the at least one inlet channels and controlled at a correct stroke and with respect to re-charging air by said at least one short-stroke re-charging valve after inlet closure of the other inlet channels of the internal combustion engine such that the suction/charging stroke of the four-stroke process is maintained entirely or partially, the at least one short-stroke re-charging valve being also disposed in the cylinder head of the internal combustion engine, wherein the at least one short-stroke re-charging valve and the piston of the small-capacity compressor are either cam-controlled and operating at the speed of the camshaft for re-charging at the correct stroke of the at least one cylinder of the internal combustion engine, or the at least one short-stroke re-charging valve is cam-controlled and the small-capacity compressor is crank-controlled and operating at the speed of the camshaft or at an increased speed relative to the speed of the camshaft at the correct stroke for re-charging at the correct stroke of the at least one cylinder of the internal combustion engine, wherein the small-capacity compressor that is crank controlled includes at least one a pilot control valve for re-charging at the correct stroke.