There is no doubt that air quality and climate change are the key drivers in the whole world. How to improve powertrain dynamics while meet future CO2 and emission targets remains a challenge and will require fundamental changes and advanced technologies.
Based on some professional literature reports, here are two most utilized powertrains propulsion systems meet for the foreseeable CO2 reduction.
Firstly, one effective yet comparatively simple and cost-effective method has proven to be the called Variable Geometry System, (VGS) can mitigate this conflict. VGS performance is also limited since a wide-range operation is mandatory. Increasing powertrain electrification carries great potential for further mitigating the conflict between temporary, low-end steady state and rated power requirements of the engine. Further optimizations are aimed at achieving an overall positive energy balance. In this regard, electrification can be utilized to improve engine efficiency. They are essentially a plug and play technology on top of vehicle hybridization. Furthermore, they are compatible with variable geometry turbines as well as exhaust gas recirculation solutions and will not be a consumer of electricity.
Secondly, Brake Specific Fuel Consumption (BSFC) improvements for relevant operating conditions and expected reductions of CO2 in the WLTC. One crucial point of the electrified charging systems is the energy demand during a cycle. Electrifying a turbocharger removes the constraint of needing a small turbine with excellent efficiency to drive its second turbocharged age. Such a right-sized electrified turbocharger can deliver CO2 reduction by supporting downsizing and down speeding at the same time.
As a result, the electric turbocharger is dimensioned so that the turbocharger may be motored and braked up to and including full turbocharger speed. It has been shown that a correctly sized electrified turbocharger can provide a route for original equipment manufacturers to meet some of the major engineering challenges, particularly the requirement to respect stoichiometric operation, while still improving the performance of their powertrains further.
Reference
1. Electric Turbocharger Concept for Highly Efficient Internal Combustion Engines. Rode, 2019/7 Vol.80, Iss.7-8
2. Electric Turbocharging- Key Technology for Hybridized Powertrains. Davies, 2019/10 Vol.80; Iss.10
Post time: Jan-11-2022