低速柴油机高压共轨燃油系统电控策略研究-船舶与海洋工程专业论文.docxVIP

上海交通大学硕士学位论文 上海交通大学硕士学位论文 万方数据 万方数据 低速柴油机高压共轨燃油系统电控策略研究 摘 要 本文建立了船用柴油机高压共轨燃油系统控制策略，并对该策略 进行了仿真测试。 基于高压共轨燃油系统的工作原理和工程图，分析每个部件单元 包含的数学关系，以 Simulink 为工具建立系统模型。为了验证该模型 的准确性，将它与由 SimulationX 搭建的同系统模型做对比。这两个 模型的仿真结果基本一致，说明本文所建的 Simulink 模型具有一定的 准确性。 对燃油系统 Simulink 模型进行仿真测试，，深入分析高压共轨燃 油系统的特性，根据特性建立系统的控制策略，该策略包括控制参数 随工况变化的轨压变参数复合控制策略和基于自学习方法的喷油控制 策略两部分。变参数复合控制不仅结合了反馈和前馈的优点，控制精 确、快速，而且根据工况调整控制参数，使得在所有工况下都能实现 良好的轨压控制。喷油控制策略从上一次喷油过程中学习模拟出下一 次喷油的控制参数，有效地进行了喷油控制。 最后从稳态过程和动态过程两方面，在 Silver 虚拟集成平台上以 模型在环仿真的方式测试控制策略控制效果。仿真测试结果表明，本 文建立的控制策略缩短了轨压变化的过渡时间，降低了轨压的最大超 调量，精确地控制了喷油提前角和喷油量。 关键词：高压共轨，变参数复合控制，自学习方法，模型在环 I RESEARCH ON CONTROL STRATEGY OF HIGH-PRESSURE COMMON RAIL FUEL SYSTEM FOR MARINE ENGINE ABSTRACT This thesis built up the control strategy of high-pressure common rail fuel system for marine engine and tested it with simulation. Based on the engineering drawings and operational principle, the high-pressure common rail fuel system model was built up with Simulink. According to the simulation and analysis on this model, the control strategy of high-pressure common rail fuel system was established. The strategy included two parts: the variable-parameter compound control of rail pressure and the injection control based on the self-learning algorithm. Then this thesis did the model-in-the-loop simulation from both the steady-state and dynamic processes with Silver. The results show that: For the steady-state process, the variable-parameter compound control strategy can achieve optimal control under any operating conditions. Farther off the rated operating condition, the more it can reflect its superiority. As to the process of changing injection quantity, it reduces the probability of undesirable control result by 75% compared with the regular compound control strategy. As to the process of changing speed, the transition period is shortened by about 2.5s. As to the steady-state process, the actual injection quantity was controlled to be the same as the target injection quantit