Robust Common-Rail Pressure Control for a Diesel-Dual-Fuel Engine Using QFT-Based Controller
Robust Common-Rail Pressure Control for a Diesel-Dual-Fuel Engine Using QFT-Based Controller
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DOI：
10.4271/2009-01-1799
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发表时间：
2009-06
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通讯作者：
W. Chatlatanagulchai;Tanet Aroonsrisopon;K. Wannatong
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作者：
W. Chatlatanagulchai;Tanet Aroonsrisopon;K. Wannatong
以柴油为先导、天然气为主要燃料的柴油-双燃料发动机虽然前景广阔，但在高速低负荷时存在NOx排放高、爆震等问题。为了科普这些挑战，共轨压力的变化提供了另一个理想的自由度。然而，由于复杂的动力学特性、输送轨内的压力波、来自喷射变化的干扰、发动机速度变化和致动器限制，共轨压力控制依赖于简单的PID仅提供勉强令人满意的结果。为了实现更好的控制，一些尝试已经导致控制系统过于复杂或不太鲁棒。根据定量反馈理论设计了一种控制器。除了能够定量地执行规格，如跟踪，植物输入和输出干扰抑制，稳定裕度，控制器的设计从一个简单的模型，其参数是不确定的，因此鲁棒性。所得控制器具有低阶且易于实现。在Ricardo Hydra发动机的共轨系统上进行了双燃料发动机的实验，结果表明该控制器优于PID控制器。
Despite promising future, the diesel-dual-fuel engine, with diesel as pilot and natural gas as main, abounds with challenges from high NOx emission and knock especially at high speed and low load. To cope with these challenges, variation of common-rail pressure provides another desirable degree of freedom. Nevertheless, crippling with complicated dynamics, pressure wave inside the transporting rail, disturbance from varying of injections, engine speed variation, and actuator limitation, common-rail pressure control has relied on the simple PID to deliver only marginally satisfactory result. Some attempts to achieve better control have resulted in either too complicated or not too robust control system. We devise a controller from the quantitative feedback theory. Besides being able to quantitatively enforce specifications such as tracking, plant input and output disturbance rejections, and stability margin, the controller is designed from a simple model, whose parameters are allowed to be uncertain, hence robustness. The resulting controller has low order and is readily implementable. Experiment with a common-rail system in a Ricardo Hydra engine, modified to run dual fuel, shows the controller’s effectiveness over the PID.