双燃料掺烧发动机ECU硬件设计与实现

发布时间：2018-06-20 09:34

本文选题：天然气 + 掺烧ECU　；参考：《华南理工大学》2015年硕士论文

【摘要】：近年来大气污染日益严重,汽车尾气是主要污染源之一,因此其排放标准越来越严格。另外由于石油燃料的过度开采导致石油资源日益匮乏,迫于环境保护和能源储备的双重压力,汽车替代燃料的研究显得刻不容缓,天然气因其优良的特性成为目前最实用的车用替代燃料。根据我国汽车行业发展的现状,希望在不改变柴油机内部结构的前提下,通过掺烧的方式将天然气应用于柴油发动机。因此开发一款通用的掺烧发动机电子控制单元(ECU)具有重大的战略意义和实用价值。论文所开发的掺烧发动机电控系统是基于国内外主流的高压共轨式柴油机,是在原柴油机电控系统的基础上增加一套并行的主动掺烧ECU和额外传感器装置。通过改善控制手段来优化掺烧的燃烧过程,从而达到通过掺烧天然气的方式,在仅使用氧化型催化器的条件下就能够实现低排放指标。开发的掺烧ECU与原柴油ECU是并行的关系:纯柴油模式下柴油喷嘴的控制权属于原柴油ECU;掺烧模式下,掺烧ECU获取柴油喷嘴的控制权,而且原柴油ECU不会产生误报警。因此开发的掺烧ECU不仅具备天然气喷射功能,而且还能够实现柴油喷射的主动控制和燃烧模式的切换。根据掺烧ECU的设计要求和控制思想,论文完成了掺烧ECU的硬件电路设计,具体包括电源电路、控制电路、信号处理电路、电子节气门驱动电路、天然气和柴油的喷射电路以及通信电路。论文针对掺烧电控系统的核心电路—柴油喷射控制电路给出了具体的编程实现流程图。最后进行了台架实验,测试表明设计的天然气驱动电路能够很好地完成天然气的喷射控制。
[Abstract]:In recent years, air pollution is becoming more and more serious, automobile exhaust is one of the main pollution sources, so its emission standard is becoming more and more strict. In addition, due to the oil resources being increasingly scarce due to the over-exploitation of petroleum fuels, the study of alternative fuels for automobiles is urgent because of the dual pressure of environmental protection and energy reserves. Natural gas has become the most practical alternative fuel for vehicles because of its excellent characteristics. According to the present situation of automobile industry in China, it is hoped that natural gas can be used in diesel engine by blending combustion without changing the internal structure of diesel engine. Therefore, it is of great strategic significance and practical value to develop a general electronic control unit (ECU) for mixed combustion engine. The electric control system developed in this paper is based on the domestic and foreign mainstream high pressure common-rail diesel engine. It is to add a set of parallel active blending ECU and extra sensor device to the original diesel engine electronic control system. The combustion process of mixed combustion can be optimized by improving the control method, so that the low emission target can be achieved under the condition of using only oxidized catalytic converters by mixing natural gas. The developed ECU has a parallel relationship with the original diesel ECU: the control power of diesel nozzle belongs to the original diesel ECU in pure diesel mode, and the control power of diesel nozzle is obtained by blending ECU in mixed mode, and the ECU of original diesel does not cause false alarm. Therefore, the developed ECU not only has the function of natural gas injection, but also can realize the active control of diesel injection and the switching of combustion mode. According to the design requirements and control idea of ECU, the hardware circuit design of ECU is completed, including power supply circuit, control circuit, signal processing circuit, electronic throttle drive circuit. Gas and diesel injection circuit and communication circuit. In this paper, the programming flow chart of diesel injection control circuit, which is the core circuit of blending electric control system, is given. Finally, a bench test is carried out, and the test results show that the designed natural gas drive circuit can complete the natural gas injection control well.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK402

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