Process for determining particle emission in the exhaust fume stream from an internal combustion engine
AssigneeAVL List GmbH
InventorsHolger Hülser, Manfred Krickler
Life of this patent
Estimating the term…
Abstract
A process for determining particle input into a particle filter arranged in the exhaust fume stream of an internal combustion engine makes it possible to determine the mass of deposited particles by taking into account particle and nitrogen oxide emission.
Claims37
Method for determining particulate emissions in the exhaust gas stream of an internal combustion engine, comprising the following steps:
- preparing an emissions model based on an operational characteristic map of the engine;
- measuring actual particulate emissions in the exhaust gas stream during a fixed or variable measuring interval and integrating particulate emissions over the measuring interval;
- computing ideal particulate emissions during the measuring interval by means of the emissions model and integrating ideal particulate emissions over the measuring interval;
- comparing measured actual particulate emissions and computed ideal particulate emissions;
- determining a correction factor based on the difference of measured actual particulate emissions and computed ideal particulate emissions;
- and
- taking into account the correction factor when determining ideal particulate emissions from the emissions model.
Method for determining a particle load deposited in a particulate filter located in an exhaust duct of an internal combustion engine, including the following steps:
- preparing an emissions model for particles which is based on a characteristic map;
- preparing at least one, characteristic-map-based emissions model for nitrogen oxides;
- preparing a temperature-dependent model for the oxidation of soot particles by nitrogen oxides;
- determining at least one value selected from the group theoretical particle mass or particle concentration for at least one operating point using the emissions model for particles;
- determining at least one value selected from the group mass or concentration of nitrogen oxides for at least one operating point using the emissions model for nitrogen oxides;
- determining at least one value selected from the group negative equivalent particle mass or negative equivalent concentration for the nitrogen oxide mass or concentration determined in the preceding step, using the oxidation model of soot particles by nitrogen oxides;
- determining at least one value selected from the group effective particulate mass or concentration using the emissions model for particles and the negative equivalent particle mass and/or concentration;
- and
- accumulating the effective particulate mass or concentration in a model of the particulate filter.
Method for controlling the regeneration of an exhaust treatment device, especially a particulate filter, by means of a characteristic-map-based computational model, where the exhaust treatment device is divided into at least two cells, and where a deposit load state of each cell is determined by means of a deposition model and a regeneration process for the exhaust treatment device is initiated depending on the deposit load state, wherein a deposit state index is determined which is based on the deposit load state of at least one cell, and that the regeneration process is initiated depending on the value of the deposit state index.
Method for controlling the regeneration of an exhaust treatment device, especially a particulate filter, by means of a characteristic-map-based computational model, where the exhaust treatment device is divided into at least two cells and preferably at least five cells, and where the deposit load state of each cell is determined by means of a deposition model and a regeneration process for the exhaust treatment device is initiated depending on the deposit load state, wherein at least one threshold value for the maximum permissible deposit load state is defined for each cell, and wherein the regeneration process for the exhaust treatment device is initiated if the deposit load state of at least one cell exceeds the corresponding threshold value.
Dependencies are inferred from the claim text.