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US 6,213,086 B1Granted
Combustion engine
AssigneeAVL List GmbH
InventorsFranz Chmela, Peter Meurer
Life of this patent
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AssigneeAVL List GmbH
InventorsFranz Chmela, Peter Meurer
Estimating the term…
A process for operating of an internal combustion engine running on fuel that is both externally ignitible and self-ignitible, especially gasoline, the operating region of the engine including self-ignition or compression-ignition (CI) regions and external-ignition or spark-ignition (SI) regions, and a high compression ratio suitable for self-ignition of the fuel being provided, at least in compression-ignition regions, and combustion being initiated by self-ignition of the fuel-air mixture in compression-ignition regions and by spark-ignition of the fuel-air mixture in spark-ignition regions, and part-load operation being assigned to the compression-ignition region, whilst full-load operation and/or operating modes with high engine load as well as cold starts are assigned to the spark-ignition region. In order to improve the quality of the exhaust gases while maintaining high efficiency, a largely homogeneous fuel-air mixture should be produced in the combustion chamber in the compression-ignition region.
An internal combustion engine which is operable in a combustion-engine mode at part load and in a spark-ignition mode at full load and high engine load and in the cold-start phase, with a combustion chamber for each cylinder, into which opens at least one fuel injector for direct fuel injection and one ignition device which is activatable and deactivable depending on the operating mode of the engine, wherein a substantially homogeneous fuel-air mixture produced in the combustion chamber during compression-ignition operation, and wherein the actual compression ratio is 15:1 to 20:1, and wherein a control unit is provided for switchover between compression-ignition and spark-ignition mode, which will register the actual operating parameters for each operating mode of the engine, the combustion chamber being formed by a piston recess, at least for the largest part, and each cylinder is provided with at least one intake port which is designed so as to create a swirl.
A process for operation of an internal combustion engine running on fuel that is both externally ignitable and self-ignitable, especially gasoline, an operating region of the engine including-self-ignition or compression-ignition regions and external-ignition or spark-ignition of the fuel being provided, at least in compression-ignition regions, and fuel combustion being initiated by self-ignition of an fuel-air mixture in compression-ignition regions and by spark-ignition of the fuel-air mixture in spark-ignition regions, and part-load operation being assigned to the compression-ignition region, whilst full-load operation and operating modes with high engine load as well as cold starts are assigned to the spark-ignition region, wherein an at least substantially homogeneous fuel-air mixture is produced in a combustion chamber in the compression-ignition region.
Dependencies are inferred from the claim text.