老化循环对三效催化器的老化效果研究

为研究不同整车驾驶循环对车辆三效催化器热老化的效果差异,选取两辆配备同款发动机的满足国六排放标准的纯汽油车和油电混合动力车,分别进行AMA、SRC、WLTC和典型RDE循环,利用数据采集系统实时采集车辆运行参数和三效催化器床体温度。基于阿伦尼乌斯公式将不同循环16万km耐久性后的热老化程度量化为热损伤,并以RDE循环为参照基准,将不同测试循环行驶16万km换算成对应的实际道路等效行驶里程。研究结果表明:相同循环下,油电混合动力车三效催化器的16万km热老化程度低于纯汽油车;AMA和SRC循环对三效催化器造成的热老化程度明显高于相同行驶里程下的WLTC循环和RDE循环。纯汽油车以AMA循环或SRC循环进行16万km耐久老化,对三效催化器所造成的老化效果相当于在实际道路上行驶了51.84和60.30万km;油电混合动力车以AMA循环和SRC循环进行16万km耐久老化,对三效催化器造成的老化效果相当于在实际道路上行驶30.44和29.21万km。

Study on Aging Effect of Aging Cycle on Three-way Catalytic Converter

To study the impact of different driving cycles on thermal aging of vehicles’three way catalytic converter(TWC),a gasoline vehicle and a hybrid vehicle with the same engine which meet ChinaⅥemission standard are selected to carry out approved mileage accumulation(AMA),standard road cycle(SRC),world-wide harmonized light duty driving test cycle(WLTC)and real driving emission test(RDE).Meanwhile,the operating parameters and TWC bed temperature are collected by established data collection system.Based on Arrhenius mechanism,the thermal aging intensity after durability tests with different aging cycles of 160,000 km is quantified as thermal damage,and the equivalent real driving mileage in different aging cycles are converted with the RDE cycle as the reference.The results show that,the 160,000 km thermal aging intensity of hybrid vehicle’s TWC is lower than that of gasoline vehicle’s TWC under the same aging cycle.The thermal aging intensity caused by AMA and SRC cycles is significantly higher than that caused by WLTC and RDE cycles under the same driving mileage.The thermal aging effect on TWC of 160,000 kilometers on AMA cycle and SRC cycle of pure gasoline vehicle is equivalent to that of 518,400 and 603,000 kilometers on real road respectively;and the thermal aging effect on TWC of 160,000 kilometers on AMA cycle and SRC cycle of hybrid electric vehicle is equivalent to that of 304,400 and 292,100 kilometers on real road,respectively.