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To meet the latest trends in Internal Combustion engines regarding efficiency, emissions and durability, an integrated approach to engine development is required. This paper describes about a Robust, Reliable and an integrated approach used in design and development of an engine for high power density which can be adopted for both Off-highway application as well as Genset application. The engine is developed to meet US - EPA Tier-III Emission Norms and MoEF (Genset Emission Norms for India formulated by Ministry of Environment and Forest) emission norms respectively. This paper discusses various technologies applied in developing this engine to achieve high power density, low exhaust emissions, and low noise and vibrations. This 4 valve per cylinder engine is created largely within a digital environment using the latest computer aided design (CAD) and computer aided engineering (CAE) techniques and simulation tools.

The Indian automotive industry has taken a big leap towards stringent Bharat Stage VI (BS VI) emission standards by year 2020. A digital driven design and development focusing on innovative and commercially viable technologies for combustion and exhaust after-treatment system is the need of the time. One-dimensional (1D) simulation serves as a best alternative to its counterparts in terms of obtaining faster and accurate results, which makes it an ideal tool for carrying out optimization studies at system level. In this work, 1D chemical kinetics modelling and analysis of exhaust after-treatment system (EAT) for a heavy-duty diesel has been performed using GT-Power. Initially, a single site 1D model for a diesel oxidation catalyst (DOC) has been developed and then, a two-site, 1D model for a selective catalytic reduction (SCR) catalyst was also developed based on reactor data.

This paper focuses on assessment of different thermal management strategies for heavy duty Diesel(HDD) engine aftertreatment using semi-physical model for both engine and aftertreatment. Aftertreatment configuration of DOC, DPF and SCR is considered for six cylinder HDD engine. SCR reaction kinetics, ammonia adsorption and desorption parameters were calibrated with the data from synthetic test bench. Calibrated aftertreatment model is integrated with semi physical 6-cylinder HDD engine model to validate over steady state as well as transient measurement data. Engine model is modified for different thermal management strategies such as Intake, Exhaust throttle valve, start of main injection, Post injection and evaluated for their impact on performance and emission parameters. Results over operating point are analysed to select best strategy at cold operating zone.