新型高压电控柴油机动态模型的研究

【作者】 徐建；

【导师】 徐航；

【作者基本信息】 浙江大学 ， 动力机械及工程， 2002， 硕士

【摘要】 为了满足日趋严格的发动机排放法规，改善发动机的燃油经济性，柴油机高压共轨电控技术成为必然的发展趋势，但其电控系统的复杂程度越来越大，开发难度也越来越大，为了缩短其开发周期、节省开发的人力物力，本文对开发适用于ECU硬件在环仿真系统的高压共轨电控柴油机实时动态模型进行了全面的研究。 硬件在环仿真系统具有实时性要求严格、系统衔接紧密的基本特点。它由PC监控系统、80C196KC高速接口管理系统和DSP模型实时计算系统通过共享存储器紧密耦合构成一个多处理器平台，友好的图形化用户界面、高速的信息采集和控制响应、模块化的系统功能构成为外部电控系统的调试创造了良好的开发环境，同时也为系统今后进一步的扩展奠定了扎实便利的基础。 在实时仿真系统中动态模型的设计至关重要，它决定着整套系统的可行性和可靠性。本文采用模块化方法，根据模块独立性原则和物理划分原则将整个仿真系统中虚拟化的考察对象进行了细分，并逐一建模。在所有模型模块中，发动机的燃烧模块作为影响发动机性能和影响仿真实时性的主要因素，是建模工作的核心环节。在对各方面因素进行综合比较后，本文选用Watson燃烧模型，并以改进的欧拉算法实现整个模型的计算。最后把通过ECU硬件在环仿真系统的实时运行得出的结果和实际测试数据进行对比，证实了本文设计的模型的可行性。为ECU硬件在环仿真系统在柴油机高压共轨电控系统开发中的应用提供了一个可行性的方案。更多还原

【Abstract】 To meet the increased regulatory requirements on emission and to improve fuel economy of engine, Diesel engine common rail electronic control injection technique is the most important direction of the diesel engine technique. But the electronic control units for engine is becoming more and more complex, which also makes its exploitation more difficult. In order to shorten the exploitative period and save the exploitative cost, a model of high pressure common rail diesel engine that can be used in ECU hardware-in-loop simulation system (ECU HILSS) is designed and discussed in detail in this paper.ECU HILSS has character of being real-time and tightly engaged. The HILSS is a tightly coupled multi-processor system, which is composed of a standard personal computer, a high-performance single chip microprocessor system and a fast-running floating point DSP system. The debugging of the outside ECU will become easier by the friendly graphical user interface, and the high-speed signal transfer through all the parts. Besides, the HILSS can be expanded conveniently for its modular components.As the core of the HILSS, the dynamic models affect the workability and the reliability of the whole system. All the objects are modulated by the principle of independence and physical integrality, and then modeled one by one. Compared with other processes, the combustion model is of more importance for the accuracy and the time cost of the system, so more emphases are put on it. After an all-round analysis of the contribution of the combustion models to the HILSS, the Vibe model is used, and the modified Ouler algorithm is chosen. Good agreement of model is obtained between observation and simulation.更多还原