Browse Publications Technical Papers 2019-26-0299
2019-01-19

Parametric Investigations on Diesel Oxidation Catalyst Performance of a Light Duty Diesel Engine – An Experimental and Modelling Study 2019-26-0299

The Indian automotive industry is traditionally dominated by light duty diesel powered vehicles due to their high thermal efficiency. In order to comply with the stringent future emission mandates of these diesel engines it is essential to deploy a suitable combination of emission control devices like diesel oxidation catalyst (DOC), diesel particulate filter (DPF) and DeNox converter (LNT or SCR). Since there are several configurations that are possible the most suitable set for the given application has to be selected. Experimentation for evaluating these configurations will involve a lot of resources and hence development of well-tuned simulation models that can reduce time and cost is important. In the first phase of the present research study, a single cylinder light duty diesel engine was taken for experiments. Thirteen steady state points were arrived at based on the operating conditions. Inlet and exhaust pressures and temperatures, exhaust emission concentrations and catalyst bed temperature were monitored. A one dimensional simulation model was developed in AVL BOOST. The input conditions for model development are given from the experiments. Some of the experimental data are taken for fine tuning the chemical kinetic rate parameters of the model. The model is validated then with the remaining experimental data. A detailed investigation is done with space velocity, air-fuel ratio, catalyst loading, and inlet and substrate temperatures taken as the parameters. This method is useful in sizing the DOC for a particular engine, finding the influence of catalyst loading, estimating the pressure drop across the DOC and exhaust temperature at the downstream side which is the input for the other downstream emission control devices thus saving lead time and cost.

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