Evaluation of emission control technologies on the vehicle performance and its effects on NVH performance
Effect on the environment of any activity is given a lots of concern. Emission from vehicles has also been brought into the limit of standard defined by the Indian government authorities since 2000, known as Bharat stage (BS). At present BS IV has already applied and by 2021 BS VI will come into action. So, the automobile manufacturers are working on it to bring their vehicle emission under this limit. The main object products in the diesel engine exhaust are nitrogen oxide (NOx), particulate matter (PM), carbon monoxide (CO) and hydrocarbons (HC). There are several technologies which are used to meet this legislation, either by making changes in engine design or by using some chemical reaction agents (after treatment technologies) in the exhaust system to convert production to less harmful ones. All these technologies has some of the positive or negative effects on the vehicle performance as well as on the NVH performance of the vehicle. This effect is seen due to the change in fuel injection system, hindering the exhaust gas flow or utilisation of fuel for conversion of exhaust products. Magnitude of these effect depends on the type of technology and the level up to which it is used. In this report, the author has tried to quantify these effects for a technology consisting a common rail diesel injection (CRDi) engine with a pair of diesel oxidation catalyst (DOC)/Oxycat on a passenger vehicle of Force Motors Limited. Effect on vehicle performance is evaluated by creating at two different 1D equivalent models of the vehicle consisting all the sub assemblies, one with BS III engine and peripherals while another with the BS IV engine and peripherals. Results of the models were compared and effects were quantified. The NVH performance is calculated by using the LMS Virtual.Lab software. Initially, equivalent 3D FEM acoustic model of the exhaust system with or without after treatment technology is created in the HyperMesh software and noise transmission loss is compared after applying the appropriate boundary condition to accommodate practical conditions in the model. For vibration effects, the full exhaust system 3D model is created on HyperMesh and using the Optistruct software the modal analysis is done in
Article Details
Unique Paper ID: 158539

Publication Volume & Issue: Volume 9, Issue 10

Page(s): 30 - 37
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