【作者】 张强；

【导师】 徐国强；

【作者基本信息】 河南农业大学 ， 农业机械化工程， 2007， 硕士

【摘要】 节约能源,控制有害排放,已成为内燃机技术发展的主导方向。世界各国的汽车企业和科研院所投入了大量人力和物力进行清洁高效内燃机的研究。改变发动机气门的开启相位、持续时间和升程是改善发动机性能、提高热效率和减少有害排放的一种重要方法。传统气门驱动系统通常只能保证在某一工况下优化发动机的性能,其凸轮型线在出厂时即已经固定,无法在运行过程中进行调节,因此这种气门驱动系统具有一定局限性,它使得发动机的性能难以在各种工况下都达到优化,实现无凸轮轴驱动的全可变气门技术已迫在眉睫。电磁驱动气门机构以其独特的优势倍受关注,该机构可灵活的控制气门的正时和升程,实现发动机低油耗、低排放和高效率的控制目标。国外在电磁驱动气门机构的结构设计和控制方面已做了大量研究,但由于仍有许多问题尚未解决,有关研究工作还在进行之中,要实现产品化尚需一定时间。为了能够在任意工况下对发动机的性能进行优化,本论文在参阅大量文献和借鉴国内外设计开发经验的基础上,对EMVA系统进行了探索性的研究,为今后进一步研究开发奠定了基础。本论文主要工作:(1)通过参阅大量参考文献和借鉴国内外的研究经验,对电磁气门驱动机构用高速强力电磁阀各个部分进行了设计,主要包括:磁性材料的确定、弹簧的设计、电磁铁(含静铁芯和动铁芯)的设计和电磁吸力的测试、专用气门的设计、电磁线圈的设计和整体外壳的设计等。(2)对电磁气门驱动机构用高速强力电磁阀进行了仿真研究,通过仿真,找出了影响电磁阀工作性能的影响因素。(3)对电磁气门驱动机构控制系统进行了设计,主要包括:单片机的选型、I/O的分配、功率驱动电路、程序工作流程和通讯接口等。(4)根据给定实验设计要求,做出了EMVA实物研究模型,并对其进行了运行调试。经过实验验证,能够实现高速、中速、怠速和停车的功能要求。(5)对如何解决电磁气门系统运行时电磁阀发热的问题进行了说明,并提出了解决问题的方法。同时指出了将来的电磁气门机构可能用到的DSP芯片驱动方式。更多还原

【Abstract】 Energy conservation and control harmful emissions has become the dominant technology development direction of the internal combustion engine.The automobile enterprises and research institutes of the world have been put a lot of manpower and material resources to carry out the clean and highly efficient internal combustion engine research.Changing the opening phase,duration and lift of engine valve are the important method to improve engine performance,increase thermal efficiency and reduce harmful emissions.Traditional valve actuation system usually only guarantee in a condition optimize engine performance,its cam-type line in the factory that has been fixed,can’t be regulated in the course of operations.So this valve actuation system has certain limitations.It makes it difficult to engine performance in various conditions are optimal,achievement of a camshaft-driven variable-valve-wide technical is imminent.Electromagnetic Valve Actuation’s unique advantages attracted extra attention,and the agency can control flexibility the valve timing and lift,Achieve engine low fuel consumption,low emissions and high efficiency of the control objectives.In abroad,the structure design and control of driving for electromagnetic valve has done a lot of research,But since there are still many unresolved issues,the study is also under way,and achieve product need a period of time.In order to optimize the engine performance in any condition and any circumstances,this paper investigates lots of documents and reference design and development at home and abroad on the basis of experience,a exploratory research was put up of Electromagnetic Valve Actuation by us,and this study will establish a basis for the further research and development.Main works of this dissertation are as following:Firstly:See through the vast amount of information from the literature and research experience at home and abroad,the high-speed solenoid valve’s various parts of Electromagnetic Valve Actuation have been designed,including:magnetic identification,Spring design,electromagnets(including static and dynamic core Core) design and testing of electromagnetic suction,special valve design,The electromagnetic coil design and the overall design of the casing.Secondly:The simulation of the high-speed powerful solenoid valve for Electromagnetic Valve Actuation was being done,through the simulation,the working’s performance influencing factors of the solenoid valve was identified.Thirdly:The control system of Electromagnetic Valve Actuation was designed, including:Single-Chip Microcomputer selection,distribution of input and output,the design of Power-driven circuit,workflow procedures and communication interfaces.Fourthly:The model of Electromagnetic Valve Actuation was made out according to given experimental design requirements,and this model was test. Through the test,this model can accomplish the basic function of accelerate, decelerate,idle and stop.Fifthly:The question of solenoid coil’s fever in running was explained,and the method of solution was put forward.Simultaneity,the new method of DSP train in Electromagnetic Valve Actuation was also put forward.更多还原