b'Automotive | Engineer InnovationHow toSet-up and calibrate the after treatment of system modelstaken from exhaust pipes, crosses the sample lines before being analyzed by specific probes: this operation induces a time response on measured concentration signals, depending on the specie (sensor location in the analyzer). However, it is critical to get all signals well-synchronized prior to any detailed analysis or calibration work. The gas compatibility evaluation can support this synchronization process. An atomic mass balance (C, H, N, O) is used in order to produce some criteria which should be around 100 percent. It enables the consistency of the measured concentrations to be checkedFigure 2: The optimization feature helps the kinetic model calibrationas well as the relevance of the signal synchronization settings.step can take place. The purpose of thissupport different type of analysis: stage is to find/optimize chemicaldefine the right devices and Finally, experimental data can alsomodel parameters in order to getarchitecture, support control contain some noise which also makesimulation results fitting with test data.development and validation (plant the application of optimizationmodel), or can be leveraged for broader algorithms more difficult during theIn practice, the calibration study can besystem analysis.calibration step. performed either by changing Arrhenius parameters manually whichFor instance, fast CPU time ensures full Using Simcenter Amesim exhaustactually helps to understand thecompatibility with real time simulation calibration tool, import data step,couplings between individual reactionsrequired for hardware-in-the-loop analysis, synchronization and filteringor make use of optimization features.simulation.features, engineers benefit from better data consistency, as pre-requisite to aOptimization algorithms combined withOn that basis, the exhaust line model is fine calibration using optimizationappropriate definition of cost functions,ready to be integrated to models algorithms.adapted to the handling of pollutantincluding vehicle subsystems and conversion data can help to findcontrols and apply to evaluate the Experimental curves visualization alsooptimum kinetic parameters in a moresystem attributes including emissions helps understanding involvedautomated manner. The actualover different driving cycles scenarios phenomena. For instance, in Selectiveapplication of optimization requires aincluding RDE. This can be seen as an Catalytic Converter applications,very fast processing of the simulation.important support toward the nitrogen oxides react with injectedIn the case of Simcenter Amesim,optimization of electrified powertrain ammonia. In case nitrogen oxidesCPU-efficient implementations of thewhere the engine frequent shut-off emissions decrease while urea is notmonolith models can be combined withhave a major impact on the catalytic yet injected, those capabilities providestandard batch and parallel processingconverter thermal state and conversion information about the monolithwhich makes optimizations possible inefficiency. npreconditioning with ammonia and ana very reasonable time.appropriate initial coverage parameter.Finally, this exhaust line setup process Once experimental data is processed,aims at developing predictive after the actual model parameter calibrationtreatment system models which can 37'