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目前我国实行的控制汽油尾气排放的标准是根据1993年公布的国家标准GB/T 3845-93《汽油车污染物测量怠速法》,通过测量汽油车在怠速工况下排放的CO和HC数值进行的。GB/T 3845-93规定,尾气检测的探头要插入排气管口内400mm,如果插入深度达不到规定的深度,可以采取外加套筒的方法,但要保证套筒的接头不透气。与科研认证机构不同,机动车检测站一天要检测上百辆车,感到这种检测方法在实际使用中有一定的不方便之处。 机动车检测站检测车辆的尾气排放情况有两个特点,一是在检测车间内检测,不是在马路上检测,受外界气流影响小;二是注重检测结果的数值是否超标,而具体的数值是次要的。
At present, China’s control of gasoline exhaust emissions standards are based on the 1993 national standard GB / T 3845-93 “gasoline vehicle pollutants measuring idle speed method” by measuring the petrol vehicle emissions under idle conditions CO and HC values of. GB / T 3845-93 stipulates that the exhaust gas detection probe to be inserted into the exhaust pipe mouth 400mm, if the insertion depth of less than the required depth, can be applied to the sleeve method, but to ensure that the sleeve joints airtight. Different from scientific research and certification bodies, motor vehicle testing stations must test hundreds of vehicles a day and feel that this testing method has certain inconveniences in actual use. Vehicle testing stations to detect vehicle exhaust emissions have two characteristics, first in the testing room testing, not in the road testing, the impact of small external air flow is small; Second, pay attention to the value of the test results are exceeded, and the specific value is Minor.