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NOx emission estimation method and arrangement

A technology of nitrogen oxides and input parameters, applied in the direction of exhaust device, electronic control of exhaust gas treatment device, muffler device, etc., can solve the problems of low accuracy, lack of internal process and external process robustness, etc., to reduce Effects of calibration work, reduced calibration effort, accurate and robust control

Inactive Publication Date: 2013-04-10
VOLVO CAR CORP
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Problems solved by technology

However, these examples do not use root cause contributing physical parameters to estimate NOx emissions from diesel engines
Additionally, these known examples lack robustness with respect to internal and external processes directly or indirectly affecting these physical parameters
Therefore, these examples provide relatively low accuracy

Method used

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  • NOx emission estimation method and arrangement
  • NOx emission estimation method and arrangement
  • NOx emission estimation method and arrangement

Examples

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Embodiment Construction

[0036] all Figure 1 to Figure 3 are shown schematically.

[0037] The present invention is a solution for estimating and predicting nitrogen oxide emissions from diesel engines. The solution has physical methods for estimating the exact NOx formation basis for combustion impact performance using factors before and after the combustion chamber. The inventive solution can be implemented as a software plug-in module (SPM) for a control unit in the vehicle or can be integrated in a specific unit in the vehicle. The present invention utilizes physical signals that characterize combustion events to estimate nitrogen oxide emissions from diesel engines.

[0038] The following examples of the invention relate generally to the field of aftertreatment systems for nitrogen oxides produced by diesel engines and, in particular, to solutions for estimating and predicting the amount of nitrogen oxides emissions produced by diesel engines, thus enabling the use of An aftertreatment system...

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Abstract

A NOx emission estimation method and arrangement for a diesel engine for estimating the amount of NOx generated in a combustion chamber of the diesel engine. The method comprises the steps of: providing values for speed and load by measuring the engine speed and the fuel injection amount; providing a base NOx value from an engine speed-load resolved reference NOx map; defining and providing emission influencing input parameters by measuring corresponding signal values; calculating a deviation between at least one emission influencing input parameter and a speed-load resolved reference value for the at least one emission influencing input parameter; multiplying the calculated deviation with an individual value from an individual speed-load resolved weight map for the at least one emission influencing input parameter, thereby creating an emission influencing input parameter related correction for the at least one emission influencing input parameter; adding and summarizing the at least one emission influencing input parameter related correction to the base NOx value and thereby obtaining an estimated NO x mass flow value.

Description

technical field [0001] The present invention relates to the field of NOx emission estimation, and more particularly, to a NOx emission estimation method and apparatus for an engine in a vehicle. Background technique [0002] Modern diesel engines produce NOx from engine combustion which requires the use of an aftertreatment system to deal with this NOx and as part of this control strategy it is necessary to estimate how much NOx is produced in the diesel engine combustion. Estimation of NOx emissions from diesel engines is a challenging technical area due to the difficulty of measuring NOx emissions and the difficulty in reproducing the results. In addition, diesel engine nitrogen oxide emission estimation is also a technical field that requires relatively more calibration work during later stages of diesel engine development. [0003] Today, there are various examples of estimating nitrogen oxides emitted from diesel engines. However, these examples do not use root cause ...

Claims

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Application Information

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IPC IPC(8): F01N9/00
CPCF02D41/0235F02D41/146F02D41/1462F02D35/02F02D41/144F02D41/1454F02D41/405F02D2041/1431F02D2200/0406F02D2200/0414F02D2200/0602F02D2200/0614F02D2200/101F02D2250/36F02D2041/1433F01N9/005F01N2900/08Y02T10/40
Inventor 克里斯蒂安·瓦尔蒂亚克里斯特·约翰逊
Owner VOLVO CAR CORP
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