Operating internal combustion engines
AssigneeCaterpillar Motoren GmbH & Co. KG
InventorsHendrik Johannes Lange, Andreas Banck, Markus Krueger
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Abstract
A control system is disclosed for operating an internal combustion engine. The control system includes a control unit configured for providing a part load mode that is optimized for slow operation of the engine at loads up to an upper part load limit in the range from 40% to 75% of a maximum engine load. The control unit is also configured for providing a high load mode for engine loads above the upper part load limit. In the part load mode, at least one inlet valve is closed at a closing angle later than in the high load mode.
Claims20
A control system for operating an internal combustion engine comprising at least one cylinder unit with at least one inlet valve, the control system comprising:
- a control unit configured to
- provide a part load mode optimized for part load operation and configured for an engine load up to an upper part load limit, which is set in the range from 40% to 75% of a maximum engine load, wherein the at least one inlet valve is closed at an inlet valve part load closing angle (αp);
- and
- provide a high load mode configured for an engine load above the upper part load limit, wherein the at least one inlet valve is closed at an inlet valve high load closing angle (αh);
- wherein the inlet valve high load closing angle (αh) is in a range from 5° to 25° earlier than the inlet valve part load closing angle (αp).
A method for operating an internal combustion engine comprising at least one cylinder unit with at least one inlet valve, the method comprising:
- operating the internal combustion engine in a part load mode at an engine load up to an upper part load limit in the range from 40% to 75% of a maximum engine load, wherein the at least one inlet valve is closed at an inlet valve part load closing angle;
- and
- operating the internal combustion engine in a high load mode at an engine load above the upper part load limit, wherein the at least one inlet valve is closed at an inlet valve high load closing angle in a range from 5° to 25° earlier than the inlet valve part load closing angle.
An internal combustion engine, comprising:
- at least one cylinder unit;
- at least one inlet valve associated with each of the at least one cylinder units;
- and
- a control unit configured to:
- provide a part load mode optimized for part load operation and configured for an engine load up to an upper part load limit, which is set in the range from 40% to 75% of a maximum load for the internal combustion engine, wherein the at least one inlet valve is closed at an inlet valve part load closing angle (αp);
- and
- provide a high load mode configured for an engine load above the upper part load limit, wherein the at least one inlet valve is closed at an inlet valve high load closing angle (αh), wherein the inlet valve high load closing angle (αh) is in a range from 5° to 25° earlier than the inlet valve part load closing angle (αp).
Dependencies are inferred from the claim text.