In the cold starting phase,because of the lower air temperature ,the worse fuel atomization,and the cata-lyst temperature being below initiat ion temperature,HC and CO emissions are high.
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释义
发动机在冷起动阶段由于空气温度低、燃油雾化不好、催化剂未能达到起燃温度,因而HC和CO污染严重。
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