The current emission legislation and environmental trends for reducing CO2 and fuel consumption are the major market forces in the transport industry. In these market sectors the internal combustion engine is the key product and downsizing, efficiency and economy are the driving forces. The more stringent future market forces and environmental considerations mean more stringent enginedownsizing, thus, novel systems are required to provide boosting solutions including hybrid, electric-motor and exhaust waste energy recovery systems for high efficiency, response, reliability, durability and compactness etc.
Most diesel engines are already equipped with aturbocharger, now engine developers are increasingly focusing on finding solutions for boosted gasoline engines. It is estimated that by 2015, turbochargers will find their way into over 50% of gasoline powertrains.
For large engines the big challenge is to enhance the high specific power and efficiency whilst reducing emission levels (NOx and SOx) with variable quality fuels. This will require turbocharging systems for very high boost pressure, efficiency and a high degree of system flexibility.