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New V6 3.0 l diesel engine for Hyundai/Kia’s SUVs
Abstract
To strengthen the appeal of Hyundai/Kia’s premium SUVs, a new V6 3 l diesel engine has been developed. Its combustion system provides both high performance for driving comfort and potential for Euro 4 emission standard. This engine provides a foundation for coping with the next generation Euro 5 emission standards by adopting advanced combustion and after-treatment systems while development work has already started on the application of urea injection NOx after-treatment system in order to meet the US Tier 2 Bin 5 emission standard.
... Higher injection pressures also support increased power density, and wider bowls are also thought to more closely match combustion chamber shape to higher injection pressures. [36][37][38] Wider bowls complement low compression ratio designs, due to the increased spray penetration associated with lower ambient density. 13 Wider bowls improve the k-factor (improve air utilization) and reduce the heat load on the piston due to a more favorable surface-to-volume ratio. ...
... At lower speeds and loads, when flow restrictions are less important, the higher swirl levels are used to promote mixing and soot oxidation. 10,38 Flow swirl also has drawbacks: ...
... Recent engine designs make greater use of chamfers in the cylinder head, which help increase the swirl generated at low valve lifts and reduce interference between the flows from the two intake ports. 14,37,38,62,63 Consequently, flow loss considerations are becoming less important. Flow swirl can adversely affect fuel economy despite more rapid combustion due to increased heat losses. ...
Practical aspects of light-duty diesel combustion system design are reviewed, with an emphasis on design considerations reported by manufacturers and engine design consultancies. The factors driving the selection of compression ratio, stroke-to-bore ratio, and various aspects of combustion chamber geometry are examined, along with the trends observed in these parameters in recently released engines. The interactions among geometric characteristics, swirl ratio, and the fuel injection nozzle parameters are also reviewed.
Diesel engines have been dominant powerplants for transporting goods and public transport, powering agricultural machines as well as industrial machines. After hundred years of evolution, these machines continue to be the most efficient among their counterparts. A practical vision and unbiased analysis would conclusively prove that diesel engines are here to stay for long. Over the years, technology has evolved to meet the demands of customers and policymakers. Fuel efficiency has improved significantly along with the reduction in noise to near-zero levels. An order of magnitude reduction in NOx and PM has been achieved in the last couple of decades. Future fuels and advanced combustion technology are pioneering the clean diesel revolution. However, the efficiency of conventional diesel combustion (CDC) engines should not be compromised. Therefore, modern-day engine developers need to appreciate the challenges faced in the past and how they have been resolved. This chapter summarises the fundamental causes of in-efficiency, pollutant formation, and possible approaches to tackle them. The chapter also focuses on the technological evolution of diesel engines, modern designs, and strategic optimization trends.
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