内燃—直线发电集成动力系统中自由活塞发动机空燃比与点火时刻的控制

【作者】 唐玉梅；

【导师】 常思勤；

【作者基本信息】 南京理工大学 ， 车辆工程， 2008， 硕士

【摘要】 随着能源形势的急剧变化和污染问题的日益严重,全球能源问题和汽车排放问题越来越受到国际社会的广泛关注。在能源结构变化和环境保护双重呼唤下,内燃一直线发电集成动力系统应运而生,它本身所具有的特点能够实现汽车的节能环保,可以作为下一代混合动力车辆的动力源。本论文依据系统中自由活塞发动机对控制系统的实时性要求和适用原则,主要完成了下述研究工作:研发了自由活塞发动机样机的喷油模块和点火模块及其控制器,主要包括ECU及其附属电路、各传感器信号采集处理电路、喷油模块及点火模块电路设计。设计开发了喷油器流量特性测试装置及测控界面,测定了不同燃油的电控喷油器流量特性,通过修正非线性段的流量值,在喷油器动态流量范围内,给出了指定脉宽下的喷油量计算公式。研究了自由活塞发动机稀薄燃烧控制策略,采用缸内燃烧压力传感器检测燃烧压力信息,通过软计算控制方法,设计了虚拟氧传感器,利用其对空燃比进行调节,控制自由活塞发动机的燃烧过程,达到减少污染和节约能源的双重目的。设计了点火时刻控制方案并对其进行了仿真计算,在点火时刻控制策略中应用缸内燃烧压力信息和活塞位移信号计算发动机指示功,实时修正发动机点火时刻。仿真结果表明了该控制策略的可行性和有效性。更多还原

【Abstract】 With the rapidly changing energy situation and the increasingly serious pollution problems, the global energy and automotive emissions were aroused wide attention by the international community increasingly. At the pressure of energy consumption structure and environmental protection, Internal Combustion Linear Generator Integrated Power System comes into being. It can achieve energy conservation and environmental protection because of itself characteristics, and it will be the source of power of the next generation hybrid vehicle.This thesis mainly achieved the following research work depending on the real time request and practicability of the free-piston engine control system.The injecting module, ignition timing module and the controller of theirs were designed. It mainly comprises the peripheral circuits of ECU, signal acquisition and processing circuit of the sensors, circuit of the injecting module and the ignition timing module.The flow characteristic of the electronic controlled injector testing equipment and control devices interface were designed and development. Different electronically controlled fuel injector flow characteristics were tested, through the amendment of the non-linear flow of the fuel injector within the framework of dynamic flow, the calculation formula was given the designation Injector pulse width of the calculation formula.The free-piston engine control strategy of lean combustion was researched. Virtual Lambda Sensor was designed, which can adjust the Air-Fuel ratio of engine. It be realized by soft computing, which is gained from the combustion pressure sensor. The Virtual Lambda Sensor can control the combustion process. So that can realize the dual-purpose of reducing the environmental pollution and conserving the energy.The control strategy of the Ignition Timing and emulates the method were designed. The control strategy makes use of the in-cylinder and the displacement sensor signals for computing the indicated work of engine, which can control the real time ignition timing. The result of emulation proves the method is feasibility and effective.更多还原