单缸汽油机电控喷射控制系统设计_.docVIP

摘 要 电控汽油喷射系统以电控单元ECU)为控制中心，发动机上的各种传感器的运行参数，精确地控制喷油器的喷油量，最佳空燃比的可燃混合气。MC9S12XS128单片机为主控芯片，设计了电控单元所需要的电路，并使用Protel-dxp软件绘制PCB电路板，加工，焊接和调试。其次在Codewarrior软件中采用模块化的思想编写控制程序，逐步增加控制修正量，由简单到复杂的改进喷油量控制精度。随后又利用实验室的试验车在同等条件下做对比试验，得到了大量试验数据，经不断完善程序，设计的电喷运行稳定，在同等条件下相对化油器节省燃油，达到了预期目标。 关键词： 电控汽油喷射Protel；CodewarriorAbstract Electronic Fuel Injection System (EFI) ,order the electronic control units(ECU) for the control center, collecting the operating parameters of the various sensors on the engine, has been calculated, precise control of fuel injector fuel injection quantity and injection timing, to provide the best air-fuel ratio of the combustible mixture. The system includes sensors, electronic control units and actuators, etc. In this paper, combined with energy-saving vehicle designed EFI electronic control unit, conducted a vehicle test and data analysis.First,read the information home and abroad to understand the basic principles and the development of the overall program.Selected Freescales MC9S12XS128 as the main chip microcontroller, designed circuit of the Electronic control unit, used Protel-dxp plotting PCB circuit boards, processing, welding and debugging. Second, in the Codewarrior software modular thinking write programs, and gradually increase the control of rectification, the improvement from simple to complex precision fuel injection quantity control. Then use the laboratory test car, under the same conditions to do comparison tests, get a great deal of test data, the continuous improvement process，designed EFI stable, relatively carburetor under the same conditions to save fuel, to achieve the excepted goals. Keywords:ElectronicFuelInjection; Single-Chip Microcomputer;Protel;Codewarrio 目 录 摘 要 I Abstract II 目 录 I 第一章 引 言 1 1.1 选题背景 1 1.1.1 行业背景 1 1.1.2 相关背景 2 1.2 国内外电喷技术发展简介 3 1.3 深入研究过的两套电喷 5 1.4 论文的主要内容及工作安排 7 第二章 电喷控制电路设计 8 2.1电喷控制系统结构图 8 2.2 发动机相关简介 8 2.2.1 发动机简介 8 2.2.2 发动机有关传感器和相关信号介绍 10 2.2 单片机的功能简介及其最小系统的设计 12 2.2.1 单片机的功能简介 12 2.2.2 最小系统的设计 13 2.3 外围电路