Analytical and Experimental Evaluation of Next Generation High Efficiency Powertrains with 48V EGR Pump

Authors

N. L. Bagal, Eaton, Southfield, USA; C. Bitsis, Southwest Research Institute, San Antonio, USA:

Year

2022

Print Info

Production/Publication ÖVK

Summary

Upcoming regulations for Heavy Duty (HD) Diesel commercial vehicles include simultaneous CO₂ and NO_X reduction requirements. Exhaust Gas Recirculation (EGR) is one of the most efficient and widely used engine-out NO_X reduction technologies. Variable Geometry turbochargers (VGT) are commonly used to drive EGR but have limitations in certain operating conditions and can come with an efficiency and fuel penalty. A positive displacement EGR pump provides a mechanism to decouple engine boosting and EGR flow requirement for a turbocharger. Use of EGR pump is a more efficient & controllable means of meeting engine EGR requirement while a simple, robust and more efficient fixed geometry turbocharger can be used to meet engine boosting requirement. This allows reduction in engine back pressure thus reducing pumping work and improving engine fuel economy and help meet CO₂ regulations.

In this study, 48V EGR pump evaluation is performed using analytical tools and engine testing to understand the performance impact. GT-POWER engine models are used to optimize air system including turbo selection. Selected hardware is then tested on a 15L engine to understand CO₂ improvement for steady state and transient operating conditions. Engine test results show 2-6% BSFC improvement on extended steady state and ~4% improvement on hot FTP cycle.

ISBN

1920-2323-23-1

Number of pages

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