Investigation of Cold Starting and Combustion Mode Switching as Methods to Improve Low Load RCCI Operation
Investigation of Cold Starting and Combustion Mode Switching as Methods to Improve Low Load RCCI Operation
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研究冷启动和燃烧模式切换作为改善低负载 RCCI 运行的方法
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
R. Reitz
中科院分区：
文献类型：
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作者：
R. Hanson;R. Reitz
反应性控制压缩点火(RCCI)是一种发动机燃烧策略，它利用缸内燃料混合产生低NOx和颗粒物(PM)排放，同时保持高热效率。本研究在轻型多缸内燃机(MCE)上，利用具有瞬变能力的发动机试验室，研究了RCCI和常规柴油燃烧(CDC)的工作原理。本文的主要工作是通过发动机试验来研究改善低负荷RCCI运行的方法。第一组实验研究了RCCI在冷启动条件下的运行情况。下一组测试研究了RCCI和CDC之间的燃烧模式切换。在冷启动测试期间，在48°C到85°C的发动机冷却液温度(ECT)范围内测量了RCCI的性能和排放。开环和闭环控制的组合使RCCI能够在该冷却液温度范围内以1500 rpm、1 bar BMEP工作点运行。在类似的工作条件下，即1500转/分，2巴BMEP，发动机在CDC和RCCI燃烧之间瞬时切换，使用与冷启动测试相同的开环和闭环控制。在模式切换测试期间，使用高速采样设备测量排放和性能。试验表明，通过简单的开环和闭环控制，可以将RCCI运行到48°C，排放和效率与温暖的稳态值相似。接下来，模式切换测试成功地切换了燃烧模式，在稳定状态下，两种模式的排放和性能偏差都很小。
Reactivity controlled compression ignition (RCCI) is an engine combustion strategy that utilizes in-cylinder fuel blending to produce low NOx and particulate matter (PM) emissions while maintaining high thermal efficiency. The current study investigates RCCI and conventional diesel combustion (CDC) operation in a light-duty multicylinder engine (MCE) using a transient capable engine test cell. The main focus of the work uses engine experiments to investigate methods which can improve low load RCCI operation. The first set of experiments investigated RCCI operation during cold start conditions. The next set of tests investigated combustion mode switching between RCCI and CDC. During the cold start tests, RCCI performance and emissions were measured over a range of engine coolant temperatures (ECTs) from 48 °C to 85 °C. A combination of open- and closed-loop controls enabled RCCI to operate at a 1500 rpm, 1 bar BMEP operating point over this range of coolant temperatures. At a similar operating condition, i.e., 1500 rpm, 2 bar BMEP, the engine was instantaneously switched between CDC and RCCI combustion using the same open- and closed-loop controls as the cold start testing. During the mode switch tests, emissions and performance were measured with high-speed sampling equipment. The tests revealed that it was possible to operate RCCI down to 48 °C with simple open- and closed-loop controls with emissions and efficiency similar to the warm steady-state values. Next, the mode switching tests were successful in switching combustion modes with minimal deviations in emissions and performance in either mode at steady state.