Effect of E85 on RCCI Performance and Emissions on a Multi-Cylinder Light-Duty Diesel Engine

DOI：

10.4271/2012-01-0376

发表时间：

2012-04

期刊：

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其他

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作者：

Scott J. Curran;R. Hanson;R. M. Wagner

本文研究了E85对一台轻型多缸柴油机在反应性控制压燃（RCCI）工况下的负荷扩展和FTP模态点排放指标的影响。通用汽车（GM）1.9L四缸柴油发动机具有17.5：1的库存压缩比、共轨柴油喷射系统、高压废气再循环（EGR）系统和可变几何涡轮增压器，被修改以允许进气道燃料喷射汽油或E85。通过调节预混合的低反应性燃料（汽油或E85）与直接喷射的高反应性燃料（柴油燃料）的比率来控制缸内燃料反应性已经显示出，与在均质充量压缩点火（HCCI）或预混合充量压缩点火（PCCI）中单独使用单一燃料相比，扩展了高效清洁燃烧（HECC）的操作范围。E85对特设联邦试验程序（FTP）模态点的影响进行了探讨，沿着通过轻型柴油机速度工作范围的负载扩展的影响。研究了1500 rpm，1.0 bar制动平均有效压力（BMEP）; 1500 rpm，2.6 bar BMEP; 2000 rpm，2.0 bar BMEP; 2300 rpm，4.2 bar BMEP;和2600 rpm，8.8 bar BMEP的Ad-hoc FTP模态点。以前的结果与96罗恩无铅试验汽油（UTG-96）和更多的超低硫柴油（ULSD）表明，与股票硬件，2600转，8.8巴BMEP模态点是无法获得的，由于过度的气缸压力上升率和不稳定的燃烧，无论使用和不使用EGR。研究了E85和ULSD的RCCI运行的制动热效率和排放性能，并与常规柴油机燃烧（CDC）和UTG 96和ULSD的RCCI运行进行了比较。«少

This paper investigates the effect of E85 on load expansion and FTP modal point emissions indices under reactivity controlled compression ignition (RCCI) operation on a light-duty multi-cylinder diesel engine. A General Motors (GM) 1.9L four-cylinder diesel engine with the stock compression ratio of 17.5:1, common rail diesel injection system, high-pressure exhaust gas recirculation (EGR) system and variable geometry turbocharger was modified to allow for port fuel injection with gasoline or E85. Controlling the fuel reactivity in-cylinder by the adjustment of the ratio of premixed low-reactivity fuel (gasoline or E85) to direct injected high reactivity fuel (diesel fuel) has been shown to extend the operating range of high-efficiency clean combustion (HECC) compared to the use of a single fuel alone as in homogeneous charge compression ignition (HCCI) or premixed charge compression ignition (PCCI). The effect of E85 on the Ad-hoc federal test procedure (FTP) modal points is explored along with the effect of load expansion through the light-duty diesel speed operating range. The Ad-hoc FTP modal points of 1500 rpm, 1.0bar brake mean effective pressure (BMEP); 1500rpm, 2.6bar BMEP; 2000rpm, 2.0bar BMEP; 2300rpm, 4.2bar BMEP; and 2600rpm, 8.8bar BMEP were explored. Previous results with 96 RON unleaded test gasoline (UTG-96) andmore » ultra-low sulfur diesel (ULSD) showed that with stock hardware, the 2600rpm, 8.8bar BMEP modal point was not obtainable due to excessive cylinder pressure rise rate and unstable combustion both with and without the use of EGR. Brake thermal efficiency and emissions performance of RCCI operation with E85 and ULSD is explored and compared against conventional diesel combustion (CDC) and RCCI operation with UTG 96 and ULSD.« less

Effect of E85 on RCCI Performance and Emissions on a Multi-Cylinder Light-Duty Diesel Engine - SAE World Congress

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