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AssigneeRobert Bosch GmbH
InventorsEberhard Schnaibel, Klaus Winkler
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The invention relates to a method for operating a nitrogen oxide (NOx) storage catalytic converter (12′) of an internal combustion engine (1), especially of a motor vehicle. Nitrogen oxides (NOx), which are generated by the engine (1), are stored in a first operating phase in the NOx storage catalytic converter (12′) and, in a second operating phase, nitrogen oxides stored in the NOx storage catalytic converter (12′) are discharged from the NOx storage catalytic converter (12′). The start of the second operating phase is determined based on a nitrogen oxide (NOx) fill level (mnosp) of the NOx storage catalytic converter (12′) and the NOx fill level (mnosp) is modeled based on a nitrogen oxide (NOx) storing model (30). To be able to precisely and reliably determine the start and the end of the second operating phase, it is suggested that a first value of the nitrogen oxide (NOx) mass flow (msnonk_s) rearward of the NOx storage catalytic converter (12′) is detected and the NOx storing model (30) is corrected in dependence upon the detected first value.
Method for operating a nitrogen oxide (NOx) storage catalytic converter (12′) of an internal combustion engine (1), especially of a motor vehicle, wherein nitrogen oxides (NOx), which are generated by the engine (1), are stored in a first operating phase in the NOx storage catalytic converter (12′) and nitrogen oxides stored in the NOx storage catalytic converter (12′) are, in a second operating phase, discharged from the NOx storage catalytic converter (12′), the start of the second operating phase is determined based on a nitrogen oxide (NOx) fill level (mnosp) of the NOx storage catalytic converter (12′) and the NOx fill level (mnosp) is modeled based on a nitrogen oxide (NOx) storing model (30), characterized in that a first value of the nitrogen oxide (NOx) mass flow (msnonk_s) rearward of the NOx storage catalytic converter (12′) is detected and the NOx storing model (30) is corrected in dependence upon the detected first value.
Control element, especially a read-only-memory or a flash memory, for a control apparatus (18) of an internal combustion engine (1) especially of a motor vehicle on which a program is stored which can be run on a computing apparatus, especially on a microprocessor, and is suitable for carrying out a method of one of the claims 1 to 8.
Control apparatus (18) for an internal combustion engine (1) especially of a motor vehicle, wherein the engine (1) is switched back and forth by the control apparatus (18) between a first operating phase, in which nitrogen oxides (NOx), which are generated by the engine (1), are stored in the nitrogen oxide (NOx) storage catalytic converter (12′) and a second operating phase, in which stored nitrogen oxides are discharged from the NOx storage catalytic converter (12′);
Internal combustion engine (1) especially of a motor vehicle, wherein the engine (1) includes a control apparatus (18) and a nitrogen oxide (NOx) storage catalytic converter (12′) and the engine (1) is switched back and forth by the control apparatus (18) between a first operating phase, wherein nitrogen oxides (NOx), which are generated by the engine (1), are stored in the NOx storage catalytic converter (12′) and a second operating phase, wherein stored nitrogen oxides are discharged from the NOx storage catalytic converter (12′) and the engine (1) includes first means for determining the start of the second operating phase based on a nitrogen oxide (NOx) fill level (mnosp) of the NOx storage catalytic converter (12′), which nitrogen oxide (NOx) fill level (mnosp) is modeled by means of a nitrogen oxide (NOx) storing model (30);
Dependencies are inferred from the claim text.