挡位传动比对RDE试验动力学特性与排放的影响
Influence of gear transmission ratio on dynamic characteristics and emissions in RDE test
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摘要: 为研究挡位对CO2排放、污染物排放、动力学参数的影响,选择7挡干式双离合变速器汽车作为试验车辆在相同道路上进行了4次RDE试验,依据挡位对数据进行基本划分,基于挡位划分的结果表明:CO2、CO、PN(未装GPF)排放因子与传动比、RPA均有显著的线性相关关系,NOx排放因子与传动比、RPA的相关关系稍弱;CO2在不同档位、车速下的排放规律,可由引入传动比作为变量的基于发动机单个工作循环排放量的排放分析方法进行解释,该方法对部分污染物排放规律也有一定的解释作用;在进行以减少碳排放、减少污染物排放为目标的整车标定时,传动比与排放的影响规律可作为标定换挡控制策略的参考。增加低速挡的使用时间,RPA有升高、V·apos_[95]有降低的趋势,可以提高动力学检验通过的机会。Abstract: In order to study the influence of gear on CO2 emission, pollutant emission and dynamic parameters, the 7-gear dry dual clutch transmission vehicle was selected as the test vehicle to carry out 4 RDE tests on the same road. The data were basically divided according to gear. The results show that CO2, CO, PN (without GPF) emission factors have significant linear correlation with transmission ratio and RPA, while NOx emission factors have slightly weak correlation with transmission ratio and RPA; The emission characteristics of CO2 at different gears and vehicle speeds can be explained by the emission analysis method based on the emission of a single working cycle of the engine with the transmission ratio as a variable. This method can also explain the emission characteristics of other pollutants. In the calibration of the whole vehicle aiming at reducing carbon emission and pollutant emission, the influence characteristics of transmission ratio and emission can be used as a reference for calibrating the shift control strategy. Increase the service time of low gear, RPA tends to increase, V·apos_[95] tends to decrease, which can improve the chances of passing the dynamics test.
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Key words:
- light-duty vehicle /
- gear /
- real driving emission(RDE) /
- CO2 /
- dynamic parameter
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