Comparison of Turbocharging and Pressure Wave Supercharging of a Natural Gas Engine for Light Commercial Trucks and Vans

To increase the efficiency of a natural gas engine, the use of a Miller camshaft was analysed. To avoid a decline in the low-end torque and also in the transient response, a pressure wave supercharger (Comprex™) was compared to the conventional single-stage turbocharger. The analyses for this concep...

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Bibliographic Details
Published in:Energies (Basel) 2021-09, Vol.14 (17), p.5306
Main Authors: Zsiga, Norbert, Skopil, Mario A., Wang, Moyu, Klein, Daniel, Soltic, Patrik
Format: Article
Language:English
Subjects:
Automobiles
Automotive parts
boosting
Catalysts
Catalytic converters
Cold
Diesel engines
Elastic waves
Emission control equipment
Engines
exhaust aftertreatment
Exhaust gases
Exhaust systems
Friction reduction
Gas flow
Gas temperature
Gases
low-end torque
Miller valve timing
Natural gas
pressure wave supercharging
Redesign
Thrust bearings
Torque
Transient response
Trucks
turbocharging
Vans
Water injection
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Summary:To increase the efficiency of a natural gas engine, the use of a Miller camshaft was analysed. To avoid a decline in the low-end torque and also in the transient response, a pressure wave supercharger (Comprex™) was compared to the conventional single-stage turbocharger. The analyses for this conceptual comparison were performed experimentally, and the data were then used to run simulations of driving cycles for light commercial vehicles. A torque increase of 49% resulted at 1250 rpm when the Comprex™ was used in combination with a Miller camshaft. Despite the Miller camshaft, the Comprex™ transient response was still faster than the turbocharged engine. Using the same camshaft, the turbocharged engine took 2.5-times as long to reach the same torque. Water injection was used to increase the peak power output while respecting the temperature limitations. As the Comprex™ enables engine braking by design, we show that the use of friction brakes was reduced by two-thirds. Finally, a six-times faster catalyst warmup and an up to 90 °C higher exhaust gas temperature at the three-way catalytic converter added to the benefits of using the Comprex™ supercharger. The known drawbacks of the Comprex™ superchargers were solved due to a complete redesign of the machine, which is described in detail.
ISSN:1996-1073
1996-1073
DOI:10.3390/en14175306