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1 引言国际上I/M制度执行较成功的国家(主要是美国)采用瞬态短工况多年之后发现,这种方法尽管有很多优点(主要是与FTP-72相关性极好),但是操作较复杂,费用高。另外,一些污染不特别严重的地区偏爱更为简便的方法,因此提出了稳态短工况测试方法。美国环保局同意这种选择,但前提是所选用的方法必须与FTP有较好的相关性。经过大量试验研究后,美国选择了两种稳态短工况ASM 5015和ASM 2525,并在1997年通过加州汽车维修局的认证(BAR—97)。上海市采用通过BAR—97认证的设备和ASM 5015和ASM
1 Introduction Internationally, the successful implementation of the I / M system in the United States, mainly the United States, has found after many years of transient short-term conditions that this method, despite its many advantages (mainly its excellent correlation with FTP-72) More complex and expensive. In addition, some less polluted areas prefer a more simple method, and therefore proposed a steady state short condition test method. The US Environmental Protection Agency agrees with this option, provided that the method chosen must have a good correlation with FTP. After extensive experimental studies, the United States selected two steady-state short-term ASM 5015 and ASM 2525 short-term conditions and passed the California Automotive Maintenance Agency certification (BAR-97) in 1997. Shanghai adopts BAR-97 certified equipment and ASM 5015 and ASM