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首页> 外文会议>Homogeneous charge compression ignition engines, 2009 >Experimental Investigation of Cycle-by-Cycle Variations in CAI/HCCI Combustion of Gasoline and Methanol Fuelled Engine
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Experimental Investigation of Cycle-by-Cycle Variations in CAI/HCCI Combustion of Gasoline and Methanol Fuelled Engine

机译：汽油和甲醇燃料发动机的CAI / HCCI燃烧逐周期变化的实验研究

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The development of vehicles continues to be determined by increasingly stringent emissions standards including CO2 emissions and fuel consumption. To fulfill the simultaneous emission requirements for near zero pollutant and low CO2 levels, which are the challenges of future powertrains, many research studies are currently being carried out world over on new engine combustion process, such as Controlled Auto Ignition (CAI) for gasoline engines and Homogeneous Charge Compression Ignition (HCCI) for diesel engines. In HCCI combustion engine, ignition timing and combustion rates are dominated by physical and chemical properties of fuel/air/residual gas mixtures, boundary conditions including ambient temperature, pressure, and humidity and engine operating conditions such as load, speed etc. Because of large variability of these factors, wide cycle-to-cycle variations are observed in HCCI combustion engines, similarly small variations in ignition timing and combustion rates result in wide variation in engine performance and emissions. Also, cycle-to-cycle combustion variations result in objectionable engine noise and vibrations. As a result of wide cycle-to-cycle variations, HCCI combustion can be achieved in an engine for narrow range of lean and rich operating limits. This motivates the researchers to systematically investigate mechanism and control of cycle-to-cycle variations on HCCI engines. In this paper, the combustion stabilities and cycle-to-cycle variations of a HCCI combustion engine fuelled with gasoline and methanol were investigated on a modified two-cylinder, four-stroke engine. In this investigation, port fuel injection technique is used for preparing homogeneous charge. The experiment is conducted with variable intake air temperature at different air-fuel ratios at constant engine speed. In-cylinder pressure of 100 combustion cycles for each test condition was recorded. Consequently, cycle-to-cycle variations of the main combustion parameters and performance parameters were analyzed and evaluated. To evaluate the cycle-to-cycle variations of HCCI combustion parameters at various test conditions, coefficient of variation (COV) of each parameter was used. The results show that critical parameters, which can be used to define HCCI operating range, are maximum rate of pressure rise, and COV of indicated mean effective pressure (IMEP).
机译：车辆的发展继续取决于日益严格的排放标准，包括二氧化碳排放量和燃料消耗量。为了满足近零污染物和低二氧化碳水平的同时排放要求，这是未来动力总成所面临的挑战，目前正在全世界范围内对新的发动机燃烧过程进行许多研究，例如汽油发动机的受控自动点火（CAI）。柴油发动机的均质充气压缩点火（HCCI）。在HCCI内燃机中，点火正时和燃烧率受燃料/空气/残余气体混合物的物理和化学性质，边界条件（包括环境温度，压力和湿度）以及发动机工作条件（例如负载，速度等）支配。这些因素的可变性，在HCCI内燃机中观察到较大的循环变化，类似地，点火正时和燃烧速率的细微变化也会导致发动机性能和排放物的较大变化。而且，不同周期的燃烧变化会导致令人讨厌的发动机噪音和振动。由于不同周期之间的差异很大，因此在窄的稀薄和浓密的工作极限范围内，可以在发动机中实现HCCI燃烧。这促使研究人员系统地研究HCCI发动机的循环变化机制和控制。在本文中，研究了在改进的两缸四冲程发动机上以汽油和甲醇为燃料的HCCI内燃机的燃烧稳定性和不同周期之间的变化。在这项研究中，港口燃料喷射技术用于制备均质装料。在恒定的发动机转速下，以不同的空燃比在可变进气温度下进行实验。记录每个测试条件的100个燃烧循环的缸内压力。因此，对主要燃烧参数和性能参数的逐周期变化进行了分析和评估。为了评估HCCI燃烧参数在各种测试条件下的逐周期变化，使用了每个参数的变化系数（COV）。结果表明，可用于定义HCCI操作范围的关键参数是最大压力上升速率和指示平均有效压力（IMEP）的COV。

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