发动机管理系统中点火控制模块的研究与分析

【作者】 王勇；

【导师】 王新；

【作者基本信息】 复旦大学 ， 软件工程， 2010， 硕士

【摘要】 随着汽车行业的快速发展,发动机管理系统技术一直被国外公司垄断的现象愈发突出,开发出能够工业化生产的发动机管理系统势在必行。点火控制模块是发动机管理系统中的关键控制模块之一。在国内,已经有很多人针对点火控制模块进行了研究,并提出了各种各样的控制理论。然而,这样的研究由于缺少市场的直接需求,因此,他们的研究成果难以实现工业化的批量生产,难以进入主机厂的供应体系,难以解决主机厂现在所面临的“卖方市场”的尴尬局面。点火提前角和点火能量是衡量汽油发动机点火系统性能的重要指标,它直接影响着发动机的动力性和经济性。点火能量过低,发动机的功率、扭矩下降,油耗上升,排放变坏,甚至造成发动机的停机；点火能量过高,则会造成能量浪费,同时降低点火系统的寿命。同样的道理,如果点火提前角点火过早,会造成爆震,活塞上行受阻,效率降低,磨损加剧,这是应该防止的；点火过迟,气体做功效率低,排气声大。不论点火过早或过迟,都会影响转速的提升。本文从发动机的实际运行的各种工况出发,详细分析了不同工况下的最佳点火提前角和点火能量的实现算法。根据点火控制算法,通过硬件设计和软件编程,在国内应用最为广泛的465Q型号的发动机上进行了台架标定和实验,获取了理想的匹配参数,发动机的各个指标数据均达到了设计要求。更多还原

【Abstract】 With the fast development of automobile industry, it becomes more and more manifested that the Engine Management System Technology keeps monopolized by foreign enterprises, so that it has been a certain tendency that EMS should be developed for commercial process.Ignition Control Module (ICM) is one of the key control module of EMS. There’ve been many domestic people engaged in the research of ICM and have put forward all kinds of control theories. However, due to the lack of direct market demand, it’s difficult for their research results to get in volume production and the suppliers system of the OEMs, also, it’s difficult to sovle the embarrassed issues of seller’s market involved by OEMs. Ignition advance angle (IAA) and Ignition energy (IE) are the key indexes to evaluate the characteristics of the gasoline engine’s ignition system, which influences the dynamic characteristics and fuel economy of gasoline engine directly. With lower ignition energy, the engine’s power and torque will be reduced and the fuel consumption will rise to make the exhaust situation worse even stops the engine; With higher ignition energy, it will make the ignition energy wasted, meanwhile shorten the ignition system’s lifetime. Based on the same principle, if the ignition advance angle comes early, knocking will come out to make the piston rise with additional resistance, which will reduce the efficiency and sharpen the attrition, this situation should be prevented. IF the ignition advance angle comes late, the efficiency of gas working will get lower with much noise of exhuast. No matter early or late does the ingition advance angle come, the increasement of the speed of rotation will be influenced.The article analyzes the actual calculation methods on the best solution on the ignition advance angle and ignition energy in detail on different operation conditions, based on the actual engine operation conditions of all possibilities. According to the calculation method of ignition control, and by means of harware control and software programming, it has been carlibrated on test bench and tested based on the most popular domestic engine type of 465Q. The ideal matching parameters have been achieved, as well as every index’s data of engine have meeted the design requirements.更多还原