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基于不同优化策略的国六汽车起重机排放特性研究

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DOI:10.3969/j.issn.1672-3872.2024.02.043

作  者:高 洁 1,2 ,贾佳奇 1,2 ,杨锦天 3 ,董庆奇 1,2 ,董 浩 1,2 ,王浩伟 1,2 ,罗天娇 1,2

(1. 中机科(北京)车辆检测工程研究院有限公司,北京 102100;2. 国家工程机械质量检验检测中心,北京 102100; 3. 中机寰宇(山东)车辆认证检测有限公司,山东 德州 253000)

 

摘 要:为了有效控制重型柴油车排放水平,改善大气质量。选取一辆N3类国六重型汽车起重机,采集PEMS路谱,按照 PEMS工况曲线在底盘测功机上开展不同优化策略下的排放测试。结果表明:国六重型汽车起重机现有的后处理技术路线可 以有效控制NOx、CO、CO2和PN排放,但相对于正常状态下的车辆,采用不同的优化策略使得排放有所上升,尤其是NOx和 PN,上升效果更为明显,平均提高了60%~90%。NOx比排放随速度的增加而降低,具体表现为市区>市郊>高速,比排放最高的区域出现在市区工况。车辆经过累碳(4 h和8 h)后的碳载量对NOx排放并无明显影响。此外,NOx瞬时排放和排气流量、行驶速度呈现正相关。优化扭矩响应和尿素喷射策略导致CO排放量急剧增加,排气温度和排气流量也会对DOC装置氧化CO产生不良影响。虽然高速工况下发动机负荷增加、缸内缺氧使得燃烧不充分,CO瞬时排放增加,但是此时发动机功率较高,导致CO比排放处于较低水平。CO2比排放总体较为稳定,个体间差异不大。PN排放与车辆行驶速度、发动机负荷存 在很大关系。优化喷嘴喷射和尿素喷射策略导致PN排放成倍增加。从整体来看,汽车起重机污染物排放结果均远低于国六排放标准限值,表明下阶段排放标准污染物排放限值仍有较大下降空间。

关键词:汽车起重机;PEMS工况;优化策略;排放特性

 

Research on Emission Characteristics of National Ⅵ Truck Crane Based on Different Optimization Strategies

Gao Jie1,2, Jia Jiaqi1,2, Yang Jintian3 , Dong Qingqi1,2, Dong Hao1,2, Wang Haowei1,2, Luo Tianjiao1,2

(1. Zhongjike (Beijing) Vehicle Testing Engineering Research Institute Co., Ltd., Beijing 102100; 2. National Construction Machinery Quality Inspection and Testing Center, Beijing 102100; 3. Zhongji World (Shandong) Vehicle Certification Testing Co., Ltd., Shandong Dezhou 253000)

 

Abstract: In order to effectively control the emission level of heavy diesel vehicles and improve air quality. A class N3 National Ⅵ heavy-duty truck crane was selected to collect PEMS road spectrum and carry out emission test under different optimization strategies on the chassis dynamometer according to the PEMS operating curve. The results show that the existing post-treatment technology route can effectively control NOx, CO, CO2 and PN emissions. However, compared with the normal state of the vehicle, the use of different optimization strategies to make the emissions have increased, especially NOx and PN, the rise effect is more obvious, an average increase of 60%~90%. The specific emission of NOx decreases with the increase of speed, which is manifested as urban > suburban > high-speed, and the area with the highest specific emission appears in urban conditions. The carbon load of vehicles after carbon accumulation (4 h and 8 h) has no significant effect on NOx emission. In addition, instantaneous NOx emission is positively correlated with exhaust flow and driving speed. The optimized torque response and urea injection strategy lead to a sharp increase in CO emissions, and exhaust temperature and exhaust flow also have adverse effects on the oxidation of CO in DOC units. Although the engine load increases under high-speed conditions, the cylinder hypoxia causes insufficient combustion and the instantaneous CO emission increases, the engine power is higher at this time, resulting in a lower CO emission. Specific CO2 emissions were generally stable with little difference among individuals. PN emission is closely related to vehicle driving speed and engine load. Optimized nozzle injection and urea injection strategies resulted in a doubling of PN emissions. On the whole, the pollutant emission results of the truck crane are far lower than the National Ⅵ emission standard limits, indicating that the emission limit of the emission standard pollutants in the next stage still has greater room for decline.

Keywords: truck crane; PEMS operating condition; optimization strategy; emission characteristic

 

引文信息:[1]高洁,贾佳奇,杨锦天,等.基于不同优化策略的国六汽车起重机排放特性研究[J].南方农机,2024,55(2):154-158. 

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