Cranking procedure for a four-stroke internal combustion engine with a crankshaft mounted electric turning machine

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United States of America Patent

PATENT NO 11703005
APP PUB NO 20210222639A1
SERIAL NO

17153189

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An internal combustion engine has one or more combustion chambers defined by one of more cylinders, corresponding pistons, and a cylinder head. A crankshaft is operatively connected to the pistons and to an electric turning machine. To start the engine, the electric turning machine rotates the crankshaft in a first direction toward a reversal point corresponding to a local maximum drag torque of the internal combustion engine, this rotation being made without rotating the crankshaft beyond the reversal point. The electric turning machine then rotates the crankshaft in a second direction opposite from the first direction, a momentum impressed on the crankshaft by compression obtained when rotating in the first direction increasing a speed of the crankshaft in the second direction. Thereafter, fuel is injected in one of the combustion chambers in which the corresponding piston first reaches a top dead center position and the fuel is ignited.

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Patent Owner(s)

Patent OwnerAddress
BRP-ROTAX GMBH & CO KG4623 GUNSKIRCHEN

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Burgstaller, Alexander Bad Schallerbach, AT 1 1
Freudenthaler, Martin Stadl-Paura, AT 2 1
Hollinger, Philipp Unterweitersdorf, AT 1 1
Killingseder, Lukas Eschenau im Hausruckkreis, AT 1 1

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