共查询到17条相似文献,搜索用时 203 毫秒
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炭罐作为燃油蒸发排放的主要控制部件,对蒸发排放测试起着至关重要的作用,如何使试验中的炭罐状态尽可能一致,是保证蒸发排放试验科学准确的必要条件。不同的炭罐吸附状态对摩托车蒸发排放测试结果有明显影响;炭罐老化过程需根据实际情况,对老化次数有所增加;丁烷作为炭罐吸附介质远优于汽油,建议以丁烷作为炭罐预处理及性能试验的吸附介质;环境湿度对炭罐预处理结果影响较大,应注意测试中环境条件的控制。 相似文献
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本文分析了炭罐的应用背景,讲述了HJ/T390-2007和GB20998-2007两个标准中对炭罐性能评价和老化处理的试验方法,并对天津科达动力测控技术有限公司开发的CP-Ⅲ型炭罐综合测试系统结构及工作原理进行了介绍. 相似文献
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采用西门子SIMATIC S7—200可编程控制器自主开发了炭罐综合性能试验装置,用于满足摩托车及汽车燃油蒸发标准对炭罐预处理的要求,同时还能对不同车型的活性炭罐进行各种性能试验。系统软件包括下位机软件——STEP7V4.0和上位机软件——WINCCV6。 相似文献
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<正>车型:帕萨特新领驭,配置2.0L发动机(BNL)、自动变速器。VIN:LSVE449FXA2××××××。行驶里程:154400km。故障现象:客户反映,在该车行驶几万千米时,发动机就会偶尔出现低速熄火的症状,每次到服务站检查,诊断系统都会有空气流量传感器方面的故障码,为此先后处理更换了空气流量传感器,以及发动机线束(主要针对空气流量传感器插头),更换了发动机控制单元、燃油泵、炭罐电磁阀、炭罐、点火线圈、火花 相似文献
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2摩托车燃油蒸发测试影响因素分析2.1炭罐老化对摩托车进行燃油蒸发测试DBLT和FIHSL试验前,要先进行炭罐老化试验。因此,炭罐老化试验结果会直接影响DBu’和HsL试验数据的准确性。除去其他影响因素,从表1试验数据看出,3个检测机构9次燃油蒸发试验前的炭罐预处理后质量都不相同,并呈递增趋势,说明此次测试的炭罐在检测机构A的老化试验不完全, 相似文献
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《汽车工程》2017,(7)
本文中对同一辆带有车载加油蒸气回收(ORVR)系统的汽车分别进行3次EPA法规和国六法规的加油排放试验(预处理工况分别为FTP和WLTC),并采集脱附工况下的炭罐脱附流量和加油排放量。结果表明,FTP工况的炭罐脱附总量(981.89,993.25和987.54L)大于WLTC工况(867.88,881.31和876.8L),且EPA加油排放结果(0.033 1,0.036 7和0.039 6g/L)远小于国六试验(0.111,0.103和0.107g/L)。说明在FTP工况下车辆的脱附效果较好,加油试验前车辆富余的炭罐工作能力越大,越能有效控制加油排放。 相似文献
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随着汽车产业的发展,以及客户满意度要求的不断提高,NVH已经成为评价汽车性能最重要的技术指标之一。文章介绍了汽车的NVH特性的意义,具体分析了A车型碳罐电磁阀电磁阀噪音传递到乘客舱的根本原因,并在不改变系统工作策略和标定的情况下,通过阻隔噪音的传播途径,解决了驾驶室内的噪音问题,大大提高了客户满意度。 相似文献
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路面铣削装置的刀具排列形式与切削阻力矩计算 总被引:2,自引:0,他引:2
路面铣削机械的滚动铣削筒上的刀具排列对铣削作业性能和效率都有很大的影响,本文在分析刀具排列图形及其参数的同时,对铣削装置的铣削阻力,阻力矩等计算进行了详细的分析。 相似文献
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A. Broatch J. M. Luján S. Ruiz P. Olmeda 《International Journal of Automotive Technology》2008,9(2):129-140
Most of hydrocarbon (HC) and carbon monoxide (CO) emissions from automotive DI Diesel engines are produced during the engine
warm-up period and are primarily caused by difficulties in obtaining stable and efficient combustion under these conditions.
Furthermore, the contribution of engine starting to these emissions is not negligible; since this operating condition is highly
unfavorable for the combustion progress. Additionally, the catalytic converter is ineffective due to the low engine temperature.
In conjunction with adequate engine settings (fuel injection and fresh air control), either the glow plugs or the intake air
heater are activated during a portion of the engine warm-up period, so that a nominal engine temperatures is reached faster,
and the impact of these difficulties is minimized. Measurement of gaseous pollutants during engine warm-up is currently possible
with detectors used in standard exhaust gas analyzers (EGA), which have response times well-suited for sampling at such transient
conditions. However, these devices are not suitable for the measurement of exhaust emissions produced during extremely short
time intervals, such as engine starting. Herein, we present a methodology for the measurement of the cumulative pollutant
emissions during the starting phase of passenger car DI Diesel engines, with the goal of overcoming this limitation by taking
advantage of standard detectors. In the proposed method, a warm canister is filled with an exhaust gas sample at constant
volumetric flow, during a time period that depends on the engine starting time; the gas concentration in the canister is later
evaluated with a standard EGA. When compared with direct pollutant measurements performed with a state-of-art EGA, the proposed
procedure was found to be more sensitive to combustion changes and provided more reliable data. 相似文献
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