轻型车不同测试工况排放特性研究及换挡程序开发
发布时间：2019-06-05 01:09
【摘要】：大气污染防治是当下热点话题,作为城市大气污染源之一,机动车尾气排放得到人们更多的关注。HC、CO、NOX以及颗粒物等汽车排放物会对人体及环境造成很大的危害。世界各国正在不断升级轻型车排放法规,制定更加严格的污染物排放限值,以降低轻型车尾气对人们生活造成的不利影响。本文主要围绕轻型车的实验室排放测试实验进行相关研究工作。文章从排放测试工况入手,介绍世界主要排放法规下的测试工况,如NEDC、WLTC、FTP75、US06、SC03工况等,对工况进行拆解分析,并对比研究不同工况的特征参数。选择3辆不同的轻型车,在不同工况下进行了79次有效的实验室排放测试实验。通过模态数据对比及瞬态排放数据分析,研究冷热启动、供油方式、燃油质量、空调开启及不同整车标定工况等因素对排放因子HC、CO、NOX及颗粒物数量PN的影响。结果表明,HC及NOX受冷热启动状态影响较大,CO在工况高速下急加速过程增幅明显,不同供油方式GDI及PFI对PN排放影响较大。针对手动挡车辆的实验室工况测试编程开发了2套换挡策略程序。试验车辆参数不足时,可按速度单参数换挡策略进行换挡;试验车辆参数充足时,可按节油的多参数换挡策略进行换挡。多参数换挡策略控制更加精确,避免出现动力输出不足的情况,适用范围更广。换挡策略经过挡位修正,避免频繁换挡,保证驾驶员良好的操作性和车辆的跟速特性。
[Abstract]:Air pollution prevention and control is a hot topic at present. As one of the urban air pollution sources, motor vehicle exhaust emissions have attracted more attention. HC, CO,NOX and particulate matter emissions will cause great harm to human body and the environment. Countries around the world are constantly upgrading light vehicle emission regulations and formulating stricter emission limits to reduce the adverse impact of light vehicle exhaust on people's lives. In this paper, the related research work is carried out around the laboratory emission test experiment of light vehicle. Starting with the emission test conditions, this paper introduces the test conditions under the main emission laws and regulations in the world, such as NEDC,WLTC,FTP75,US06,SC03 working conditions, analyzes the working conditions, and compares the characteristic parameters of different working conditions. 79 effective laboratory emission tests were carried out in three different light vehicles under different working conditions. Through modal data comparison and transient emission data analysis, the effects of cold and hot start, fuel supply mode, fuel quality, air conditioning opening and different vehicle calibration conditions on emission factor HC,CO,NOX and particle quantity PN were studied. The results show that HC and NOX are greatly affected by cold and hot start-up state, the rapid acceleration process of CO increases obviously under high speed, and different fuel supply modes GDI and PFI have great influence on PN emission. Two sets of shift strategy programs are developed for the laboratory condition test of manual gear vehicles. When the parameters of the test vehicle are insufficient, the shift can be carried out according to the speed single parameter shift strategy, and when the test vehicle parameters are sufficient, the shift can be carried out according to the fuel saving multi-parameter shift strategy. The control of multi-parameter shift strategy is more accurate, which avoids the lack of power output and has a wider range of application. The shift strategy is modified to avoid frequent shift to ensure the good maneuverability of the driver and the follow-up characteristics of the vehicle.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U467.48
本文编号：2493140
[Abstract]:Air pollution prevention and control is a hot topic at present. As one of the urban air pollution sources, motor vehicle exhaust emissions have attracted more attention. HC, CO,NOX and particulate matter emissions will cause great harm to human body and the environment. Countries around the world are constantly upgrading light vehicle emission regulations and formulating stricter emission limits to reduce the adverse impact of light vehicle exhaust on people's lives. In this paper, the related research work is carried out around the laboratory emission test experiment of light vehicle. Starting with the emission test conditions, this paper introduces the test conditions under the main emission laws and regulations in the world, such as NEDC,WLTC,FTP75,US06,SC03 working conditions, analyzes the working conditions, and compares the characteristic parameters of different working conditions. 79 effective laboratory emission tests were carried out in three different light vehicles under different working conditions. Through modal data comparison and transient emission data analysis, the effects of cold and hot start, fuel supply mode, fuel quality, air conditioning opening and different vehicle calibration conditions on emission factor HC,CO,NOX and particle quantity PN were studied. The results show that HC and NOX are greatly affected by cold and hot start-up state, the rapid acceleration process of CO increases obviously under high speed, and different fuel supply modes GDI and PFI have great influence on PN emission. Two sets of shift strategy programs are developed for the laboratory condition test of manual gear vehicles. When the parameters of the test vehicle are insufficient, the shift can be carried out according to the speed single parameter shift strategy, and when the test vehicle parameters are sufficient, the shift can be carried out according to the fuel saving multi-parameter shift strategy. The control of multi-parameter shift strategy is more accurate, which avoids the lack of power output and has a wider range of application. The shift strategy is modified to avoid frequent shift to ensure the good maneuverability of the driver and the follow-up characteristics of the vehicle.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U467.48
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