By using a rapid aging program RAT-A in General Motors , the performance comparison tests of catalyst before and after its aging are conducted in FOCAS combustion system and engine respectively .
采用通用汽车公司的快速老化程序RAT-A，分别在FOCAS燃烧系统及发动机上对催化剂在老化前和老化后的性能进行对比试验。
focas