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首页> 外文期刊>International journal of engine research >Control-oriented premixed charge compression ignition combustion timing model for a diesel engine utilizing flexible intake valve modulation
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Control-oriented premixed charge compression ignition combustion timing model for a diesel engine utilizing flexible intake valve modulation

机译：柔性进气门调制的面向控制的柴油机预混合增压压缩点火燃烧正时模型

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This paper describes a simple, analytical, control-oriented model for prediction of combustion timing during premixed charge compression ignition combustion with early fuel injection. The model includes direct dependence on in-cylinder temperature, in-cylinder pressure, and the total in-cylinder O_2 mass fraction, including the contribution of recirculated exhaust gas, residual burned gas, and backflow during the valve overlap period. The model is extensively validated against experimental premixed charge compression ignition data from a multi-cylinder diesel engine utilizing high-pressure recirculated exhaust gas, variable geometry turbocharging, and flexible intake valve actuation, which allows control over the engine's effective compression ratio. The results show that across a wide range of input conditions, the model predicts the start of combustion within ±2° crank angle of the experimental values for all but three of the 180 data points (98%+ accuracy), with a root mean square error of 0.86° crank angle. The experimental start of combustion ranges from as early as -19.3° crank angle to as late as +0.6° crank angle by heavily exercising the control actuators, specifically the commanded start of injection timing SOI_(ecm), the intake valve closure timing, and the engine's air-handling system (recirculated exhaust gas valve position and variable geometry turbocharger position). Analysis is performed to isolate the effects and control authority of each actuator on the ignition delay and start of combustion timing. During these actuator sweeps, the model captures complex relationships and predicts the start of combustion within ±2° crank angle of the experimental values. This premixed charge compression ignition combustion timing model can be coupled with a gas exchange model for control algorithm design and analysis.
机译：本文描述了一种简单的，面向控制的，面向控制的模型，用于预测预混合燃料压缩点火燃烧与早期燃料喷射期间的燃烧正时。该模型直接依赖于缸内温度，缸内压力和总缸内O_2质量分数，包括在阀重叠期间再循环废气，残余燃烧气体和回流的贡献。该模型已针对来自多缸柴油机的实验预混合充量压缩点火数据进行了广泛验证，该数据采用高压再循环废气，可变几何涡轮增压和灵活的进气门致动，从而可以控制发动机的有效压缩比。结果表明，在广泛的输入条件下，该模型预测了180个数据点中的三个数据点（准确度为98％+）之外的所有数据的实验值的±2°曲柄角内的燃烧开始（均方根）曲柄角误差为0.86°。通过大量使用控制执行器，实验性的燃烧开始范围从早于-19.3°曲柄角到迟至+ 0.6°曲柄角，特别是命令的喷射开始正时SOI_（ecm），进气门关闭正时和发动机的空气处理系统（再循环排气阀位置和可变几何涡轮增压器位置）。进行分析以隔离每个致动器对点火延迟和燃烧正时的影响和控制权限。在执行机构扫动期间，模型会捕获复杂的关系并预测在实验值的±2°曲柄角内的燃烧开始。该预混合充量压缩点火燃烧正时模型可以与气体交换模型耦合，以进行控制算法的设计和分析。

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