【作者】 李志军；

【导师】 任立环； 陶俊卫；

【作者基本信息】 天津大学 ， 机械制造及其自动化， 2004， 硕士

【摘要】 新一代发动机的发展面临着在燃料消耗、废气排放和动力性三方面性能不断提高的挑战。为了满足日益严格的排放法规,发动机数字点火技术的应用已成为当今内燃机发展中的主要组成部分。高性能、多功能的传感器和大规模集成电路技术促进了该项技术的产生和实用化。数字点火技术可以有效降低发动机的油耗和排放,大幅度提高发动机的性能指标。数字点火方式具有适时性好、响应快、控制点火时刻更为精确等其他点火方式无法比拟的优点。我国在发动机电子控制技术方面尤其是数字控制技术方面与发达国家有着比较大的差距,特别是在生产应用方面。而目前,随着世界石油市场越来越严峻的形式,各国对排放法规的进一步要求,国际上汽车、摩托车领域的激烈竞争,使得我们迫切需要改进传统的点火技术。作为一项开发性研究,数字点火技术具有很高的实用价值和经济价值。本文就是通过硬件技术和软件开发工具的结合,成功研制了一套用于摩托车上的的数字点火系统。本文主要完成以下三个方面的工作:1.硬件方面设计开发了一套以PIC单片机为CPU,主要基于磁电机转速信号的数字点火系统。2、软件主要包括以下方面一个是建立了一套处理三维点火提前角数据的数学模型。该模型将更适合于高速高精度的分析。另外,针对PIC芯片的硬件特点以及实时性和可靠性要求的提高,在软件抗干扰方面、提前角的生成算法方面作了创造性的尝试。并在MAPLAB-IDE集成开发环境下,利用PIC汇编语言完成了PIC上信号处理、控制的软件开发设计工作。该信号处理及控制软件主要由信号采集控制、点火控制等模块组成。在具体软件实现中,通过对采集信号的预处理,同时结合以曲面拟合算法,从而实现对点火提前角的最佳选择,充分发挥了PIC的强大数据处理能力。3、数字点火系统的实验研究。为了验证该系统的可行性和实用性。利用天波科达公司生产的C120磁电机实验台,进行了大量试验。试验结果表明,该数字点火系统达到了预想的效果。更多还原

【Abstract】 The development of new generational engine is confronted with three aspects ofchallenge: fuel consume, waste gas discharge and power which are raised constantly.To satisfy the strict discharge regulation day by day, it becomes the main trend indevelopment of internal-combustion engine that the application of digital ignitiontechnology of engine Hi-Performance, multi-functional sensor and large scaleintegrated circuit technology have promoted the birth and application of thetechnology. the digital ignition technology can reduce fuel consumption and dischargecompetence of engine effectively,and improve the performance of engine by a largemargin and must become the leading technology that will promote the development ofinternal-combustion engine trade in the future The digital ignition way progresses well at the right moment , responds quicklyand controls ignition time more precise than other ignition ways. Our country hasgreater disparity with the developed country in the electronic control technology ofthe engine , especially the digital-control ignition technology in productionapplication . But at present, with more and more severe status of petroleum marketin the world, there is a further request for laws and regulations about dischargingpollution in every country, and with the more drastic competition in the field ofinternational automobile and motorcycle, we have urgent needs to improve thetraditional ignition technology. As a developing research, the digital ignitiontechnology has a very high practical value and economic value. We havesucceeded to develop one digital ignition system used by motorcycle withhardware technology and ,software developing system.This text mainly achieved the following research work The first, on the aspect of hardware: We has designed and developed a set of digital ignition system taking the PICmonolithic integrated circuit as CPU, mainly based on electrical machine ofmagnetism’s speed signal . The second, software mainly is composed of the latter aspects:One is Setting up a set of mathematics model for dealling with three-dimensionpre-ignition angle datum.This mathematics model is suitable for the high speed andhigh accuracy analysis.the other,in view of the PIC chip hardware characteristic as well as enhancementof timely and the reliable request,and on the aspect of software antijamming, thepre-ignitition angle production algorithm,we have made the creative attempt. underthe MAPLAB-IDE integrated development environment, we have completed thesignal processing and analysis software with PIC assembly language. This signalprocessing and control software mainly is composed of signal module gatheringcontrol and ignition control,and so on . In the concrete software realization, hasrealized the best choice of pre-ignitition angle , and displayed fully the PICexcellent data-handling capacity with pretreatment of signal gathered ,as well astwo curved suface fitting algorithm.The third, Experimental study of the digital ignition system.In order to verify the feasibility of the digital ignition system , we have experiment onthe application equipment of electrical machine of magnetism of theTianbo&Keda company . The results prove that digital ignition system matcheffect anticipated.更多还原