Cooling System Optimization for Euro4 - EPA/02 Heavy Duty Trucks 2000-01-0964
Euro4 and EPA/02 emission regulations for the European and North American Heavy Duty truck market will require development of high efficiency, low pollution diesel engines. Informations received from main engine, truck manufacturers and literature surveys performed during the past two years shows that several technical solutions are being evaluated in order to reach the required emission levels.
These technical solutions can be divided into 3 main groups:
Further optimization of fuel combustion including: increase of air to fuel ratio, further retardation of fuel injection timing.
Cooled EGR including: high recycled exhaust gas ratios, short EGR loop, compressed and aftercooled EGR.
Exhaust gas aftertreatment including: de-NOx catalysts, particle traps, particle afterburning.
Different technical solutions will have different impacts on the heat rejection requirements and consequently on the layout and costs of the future cooling systems.
This paper describes the study performed by Valeo Advanced Cooling System Development Team, targeting evaluation of the future cooling systems for Heavy Duty commercial vehicles, 2002 and beyond.
Following works will be described:
Review of EPA/02-Euro4 emission regulations
Evaluation of EPA/02 - Euro 4 engine development impact on cooling system heat rejection and durability requirements
Analysis of possible technical solutions for the cooling system
Description of the computation methodology used for system computation
Study case with a simulation approach for evaluation of a new cooling system concept