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US 10,947,906 B2Granted
Method for operating an internal combustion engine, and internal combustion engine
AssigneeMTU Friedrichshafen GmbH
InventorsJohannes Schalk, Wolfgang Fimml, Christian Frey
Life of this patent
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Abstract
A method for operating an internal combustion engine, involving the following steps: determining a target lambda value and measuring an actual lambda value for combustion in a combustion chamber of an internal combustion engine; establishing, in accordance with the target lambda value and the actual lambda value, a point in time for an intake valve associated with the combustion chamber to open; and opening the intake valve at the established point in time.
Claims10
A method for operating an internal combustion engine, comprising the steps of:
- determining a setpoint lambda value and measuring an actual lambda value for a combustion in a combustion chamber of an internal combustion engine;
- determining an opening time for an inlet valve assigned to the combustion chamber as a function of the setpoint lambda value and the actual lambda value;
- opening the inlet valve at the determined opening time;
- determining a setpoint nitrogen oxide ratio for exhaust gas of the combustion in the combustion chamber and measuring an actual nitrogen oxide ratio in the exhaust gas;
- determining a closing time for the inlet valve as a function of the setpoint nitrogen oxide ratio and of the actual nitrogen oxide ratio;
- and
- closing the inlet valve at the determined closing time, wherein a cascaded control or a combined multi-variable control is carried out so that initially by varying the opening time of the inlet valve, a first variable selected from the lambda control is regulated, wherein subsequently a second variable selected from the nitrogen oxide control, is regulated by varying the closing time of the inlet valve, wherein a fully variable valve drive is provided by way of a hydraulic interruption device, the hydraulic Interrupting device being set up to temporarily interrupt an operative connection between an actuator for the inlet valve and the inlet valve.
4 more elements
An internal combustion engine, comprising:
- at least one combustion chamber;
- at least one inlet valve assigned to the at least one combustion chamber to supply fresh mass;
- a lambda value adjustment device configured to adjust a lambda value for a combustion in the at least one combustion chamber,
- wherein the lambda value adjustment device is operatively connected to the at least one inlet valve and is configured to adjust an actual lambda value for the at least one combustion chamber by determining an opening time of the at least one inlet valve;
- and
- a nitrogen oxide ratio adjustment device configured to adjust a nitrogen oxide ratio for exhaust gas of the combustion in the at least one combustion chamber, wherein the nitrogen oxide ratio adjustment device is operatively connected to the at least one inlet valve and is configured to adjust an actual nitrogen oxide ratio for the at least one combustion chamber by varying a closing time of the at least one inlet valve,
- wherein the internal combustion engine is configured to carry out a cascaded control or a combined multi-variable control, in such a way that initially by varying a first control variable selected from the opening and closing times of the inlet valve, a first variable selected from the lambda control and the nitrogen oxide control is adjusted, after which a second variable, selected from the lambda control and the nitrogen oxide control, is adjusted by varying the second control variable, selected from the opening time and the closing time of the inlet valve.
4 more elements
Dependencies are inferred from the claim text.