气候变化领域集成服务门户(CCPortal): Improving Heavy Duty Natural Gas Engine Efficiency: A Systematic Approach to Application of Dedicated EGR

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DOI	10.4271/2020-01-0818
	Improving Heavy Duty Natural Gas Engine Efficiency: A Systematic Approach to Application of Dedicated EGR
	Kocsis M.C.; Mitchell R.; Moiz A.A.; Kalaskar V.; Williams D.R.; Sjovall S.
发表日期	2020
ISSN	1487191
卷号	2020-April 期号:April
英文摘要	The worldwide trend of tightening CO2 emissions standards and desire for near zero emissions is driving development of high efficiency natural gas engines for a low CO2 replacement of traditional diesel engines. A Cummins Westport ISX12 G was previously converted to a Dedicated EGR® (D-EGR®) configuration with two out of the six cylinders acting as the EGR producing cylinders. Using a systems approach, the combustion and turbocharging systems were optimized for improved efficiency while maintaining the potential for achieving 0.02 g/bhp-hr NOX standards. A prototype variable nozzle turbocharger was selected to maintain the stock torque curve. The EGR delivery method enabled a reduction in pre-turbine pressure as the turbine was not required to be undersized to drive EGR. A high energy Dual Coil Offset (DCO®) ignition system was utilized to maintain stable combustion with increased EGR rates. High compression ratio, reduced squish pistons were designed to maintain MBT combustion phasing and fast burn rates along the torque curve. The final engine configuration was tested on the Heavy-Duty Supplemental Emissions Test (SET), a 13-mode steady-state engine dynamometer test. The engine was able to achieve a weighted average efficiency improvement of 12% over the baseline configuration with a peak BTE of 41.7%. © 2020 SAE International. All Rights Reserved.
scopus关键词	Carbon dioxide; Gas engines; Ignition; Natural gas; Baseline configurations; Combustion phasing; Engine configuration; High compression ratio; Near-zero emissions; Systems approach; Turbocharging systems; Weighted averages; Gas emissions
来源期刊	SAE Technical Papers
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176929
作者单位	Southwest Research Institute
推荐引用方式 GB/T 7714	Kocsis M.C.,Mitchell R.,Moiz A.A.,et al. Improving Heavy Duty Natural Gas Engine Efficiency: A Systematic Approach to Application of Dedicated EGR[J],2020,2020-April(April).
APA	Kocsis M.C.,Mitchell R.,Moiz A.A.,Kalaskar V.,Williams D.R.,&Sjovall S..(2020).Improving Heavy Duty Natural Gas Engine Efficiency: A Systematic Approach to Application of Dedicated EGR.SAE Technical Papers,2020-April(April).
MLA	Kocsis M.C.,et al."Improving Heavy Duty Natural Gas Engine Efficiency: A Systematic Approach to Application of Dedicated EGR".SAE Technical Papers 2020-April.April(2020).