In summary, the following conclusions can be drawn:• Many arguments support the use of natural gas engines in the commercial vehicle sector. The potential for a reduction of the greenhouse gas emissions, ultra-low exhaust emissions, a favorable NVH behavior and fuel prices.• The introduction of newest US and EURO VI legislation causes a trend to stoichiometric combustion systems with three-way catalysts. A combination with external cooled EGR is a suitable means for improving the efficiency and reducing the exhaust gas temperatures.• The natural gas variants are in general derived from diesel engines. To safeguard the reliability of the gas variant, a part of the development work of the diesel engine can be transferred. However, due to the changed combustion system with new or modified components, additional tasks have to be handled during the development process.• Safeguarding the reliability is done on the one hand by engine control. Besides the control of AFR which is essential for the exhaust gas aftertreatment, most important items are EGR and knock control. On the other hand, the development of engine mechanics has to respect the changed boundary conditions, especially the higher combustion and exhaust gas temperatures and the changed hardware.
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- Safeguarding the reliability of natural gas engines for commercial vehicles
Dipl.-Ing. Christoph Biwer
Dr.-Ing. José Geiger
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