Abstract:
In one embodiment an engine system includes a cylinder, an inlet valve configured to control the flow of gases into the cylinder, an outlet valve configured to control the flow of gases out of the cylinder, a throttle configured to control the flow of fuel into the cylinder, a memory including program instructions stored therein, and a processor operably connected to the inlet valve, the outlet valve, the throttle, and the memory, and configured to execute the program instructions to control the inlet valve and the outlet valve in accordance with an HCCI valve lift profile and an SI valve open/close profile, and activate a first spark in the cylinder while controlling the inlet valve and the outlet valve in accordance with the HCCI valve lift profile and the SI valve open/close profile.
Abstract:
The invention relates to an operational method for, in particular, a direct-injection internal combustion engine having a plurality of combustion engines, in particular, for a direct-injection spark ignition engine of a motor vehicle with at least partial low NOx-combustion (NAV) and several operational sub-methods. Said method alternates between at least one additional operation sub-method and a low NOx operational sub-method. In the event of the of the low NOx sub-method being ignited by means of an ignition device at an ignition time point (ZZP), a predominately homogeneous, lean fuel/exhaust gas/air mixture having a combustion air ratio of ? =1 is spark ignited in the respective combustion chamber and a flame front combustion (FFV) that has been ignited by the spark ignition converts into a charge compression combustion (RZV). The operational stability in the respective operational sub-method improves due to the variation of the compression ratios e.
Abstract:
A spark-ignition direct-injection internal combustion engine is controlled at low loads through split fuel injections and spark discharges including one injection and spark during a negative valve overlap period and another injection and spark during a compression phase of the engine cycle.
Abstract:
A premixed compression ignition type engine is operated while change over between spark ignition combustion and compression ignition combustion. This engine has a negative overlap period during steady operation under compression ignition combustion. In the same cylinder, a valve-closing timing of an exhaust valve during steady operation under spark ignition combustion is retarded with respect to the valve-closing timing thereof after the change over. In a case where an intake valve is first changed over after start of the change over from spark ignition combustion to compression ignition combustion, the valve-opening timing of the intake valve during a change over period from spark ignition combustion to compression ignition combustion is in an advanced state with respect to the valve-opening timing thereof during steady operation under spark ignition combustion.
Abstract:
Vorrichtung und Verfahren zum Betreiben einer Brennkraftmaschine Eine Brennkraftmaschine umfasst eine Einblasevorrichtung, die zum Einblasen von Luft direkt in einen Brennraum eines Zylinders unabhängig von der Stellung eines Gaseinlassventils und unabhängig von dem Zumessen des Kraftstoffs vorgesehen ist. Die Einblasevorrichtung wird zum Einblasen von Gas angesteuert innerhalb eines Einblas-Kurbelwellenwinkelfensters, das sich von einem Beginn-Kurbelwellenwinkel (CRK B) nahe zu einem Schließt-Kurbelwellenwinkel (CRK CL) des Gaseinlassventils bis zu einem Ende-Kurbelwellenwinkel (CRK E) in dem Bereich des folgenden oberen Totpunkts des Kolbens erstreckt.
Abstract:
A powertrain, and a control method therefor, are provided, wherein ignition of a combustible charge in a combustion chamber of a controlled auto-ignition internal combustion engine equipped with in-cylinder fuel-injection and a spark ignition device is controlled. The method comprises generating a spark- discharge plasma channel between the electrodes of the spark ignition device, and igniting the combustible charge. The spark-discharge plasma channel is moved toward and entrained by the combustible charge, effective to advance phasing of controlled auto-ignition combustion.
Abstract:
An internal combustion cylinder assembly includes a cylinder having a cylinder head at an end thereof, a combustion chamber disposed in the cylinder head, a piston disposed slidably within the cylinder, the piston having a bottom dead center position distal from the combustion chamber and a top dead center position proximate to the combustion chamber, a pilot quantity of fuel disposed substantially dispersably within the cylinder, a working fluid disposed compressably within the cylinder, the piston compressing the working fluid and the pilot quantity of fuel as it slides from the bottom dead center position to the top dead center position, and wherein the pilot quantity of fuel is substantially a maximum quantity that will not support auto-ignition when the working fluid and the pilot quantity of fuel have been compressed.
Abstract:
Es wird ein Verfahren zum Betrieb einer Brennkraftmaschine vorgeschlagen, bei welchem die Einspritzung von Kraftstoff in einer Voreinspritzung und einer Haupteinspritzung vorgesehen ist. Erfindungsgemäss ist vorgesehen, dass der Kraftstoff für die Voreinspritzung je nach der Verbrennungslage vor dem oberen Totpunk des Gaswechsels und der Kraftstoff für die Haupteinspritzung saugsynchron eingespritzt wird. Das Verfahren findet Anwendung für Brennkraftmaschine, insbesondere für Personen- und Lastkraftfahrzeuge.
Abstract:
An engine has a plurality of combustion cylinders with a first piston (3) reciprocably mounted in each of the combustion cylinders in the conventional manner. The engine head has, in communication with each of the combustion cylinders, a cylindrical recess (14) containing a reciprocably mounted second piston (17). On the side of the second piston (17) opposite the combustion chamber is a control chamber (19) with inlets and outlets for controlling movement of the second piston (17). The second piston (17) is used to increase the compression ratio without appreciably reducing the expansion ratio. Alternatively, the second piston (17) may be used as a pump to pump fluid from the control chamber (19). In yet another alternative method of operation, the second piston (17) can be driven outward within the cylindrical recess (14) to an extent which varies in accordance with power demand, thereby varying the compression ratio in accordance with the power demand.