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Noise & Vibration refinement of automotive vehicles is becoming important parameter due to its influence on environmental aspect and comfort perceived by occupants. NVH parameters are driving factors in current vehicle design strategy. Drivers comfort is extremely important, and driver’s expectations from commercial and heavy-duty trucks are as good as refined passenger cars. Other trends in commercial vehicle segment such as engine downsizing, weight, cost reduction and meeting stringent emission norms have influenced vehicle design dynamics. These parameters are critical and often contribute to vehicle NVH issues. Considering these new trends in commercial vehicle segment, it becomes challenging for an NVH engineer to provide optimized solutions. NVH issues could be related to the various subsystems such as driveline, axle, transmission steering wheel etc. in the vehicle and its resonant frequencies.

The vehicular pollution and emission levels are alarmingly increasing in India. The metro and urban cities are worst hit by the gaseous and particulate emissions produced by internal combustion engine powered vehicles. Following the trend from other developed countries, Government of India (GOI) has decided to migrate from existing BS IV legislation directly to BS VI legislation from April 2020 all across India. This migration in emission legislation took almost 10 years to be implemented in European Union (EU) countries. However, for India, the targeted implementation time is just 3 years, making it an uphill challenge for all the vehicle manufacturers. City bus is one such applications, which run mostly within the city and currently are powered by conventional Diesel engines. The vehicle manufacturers should focus on finding an optimized solution for meeting the future emission legislation in true sense.

The legislations on emission reduction is getting stringent everywhere in the world. India is following the same trend, with Government of India (GOI) declaring the nationwide implementation of BS 6 legislation by April 2020 and Real Driving Emission (RDE) Cycle relevant legislation by 2023. Additionally GOI is focusing on reduction of CO2 emissions by introduction of stringent fleet CO2 targets through CAFE regulation, making it mandatory for vehicle manufacturers to simultaneously work on gaseous emissions and CO2 emissions. Simultaneous NOx emission reduction and CO2 reduction measures are divergent in nature, but with a 48 V Diesel hybrid, this goal can be achieved. The study presented here involves arriving at the right future hybrid-powertrain layout for a Sports Utility Vehicle (SUV) in the Indian scenario to meet the future BS 6 and CAFÉ legislations. Diesel engines dominate the current LCV and SUV segments in India and the same trend can be expected to continue in future.

With the increasing focus on reducing CO2 emissions to combat global warming and climate change, the automotive industry is exploring near zero-emission alternative fuels to replace traditional fossil-based fuels like diesel, gasoline, and CNG. Methanol is a promising alternative fuel that is being evaluated in India due to its easy transportation and storage, as well as its production scalability and availability potential. This study focuses on the retro-fitment solution of M100 (pure methanol) SI port-fuel injection (PFI) mode of combustion. A heavy duty single-cylinder engine test setup was used to assess methanol SI combustion characteristic. Lean operation strategy has been investigated. At lean mixture conditions a significant drop in NOX and CO emissions was achieved. The fuel injection techniques and the impact of exhaust gas recirculation (EGR) on the conventional stoichiometric combustion process is highlighted.

Many Indian cities are amongst the most polluted cities in the world. Transport sector is identified as one of the major contributors to air pollution. Following the global trend, Government of India is also promoting near zero emission fuels with zero CO2 emissions as a way forward to solve the emission problems. With its policies like Green Hydrogen Mission, government of India plans to accelerate the adoption of Hydrogen as a fuel in the country. These initiatives have created a breakthrough in development of Hydrogen ICEs by the Indian OEM’s. Hydrogen ICE have only NOx emissions as the most prominent engine out emissions. NOx emission in Hydrogen engines is very sensitive to operating lambda, where in, after a certain threshold lambda the emissions rise significantly. Therefore, the air management system plays a very important role in the hydrogen engine performance & NOx emissions. This study evaluates various air management system options for a heavy-duty Hydrogen engine.