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柴油机排气异常不仅影响使用经济性和可靠性，也对大气造成严重污染。本文通过排气特征分析，用方框图说明5种排气异常故障的分析方法。1排黑烟主要特征是，启动困难，排黑烟；低速排烟严重，高速排烟减轻或消失；中低速排烟正常，急加速排烟又严重；各种转速工况下，连续或断
Abnormal diesel exhaust not only affect the economy and reliability, but also cause serious pollution to the atmosphere. In this paper, through the exhaust characteristics analysis, a block diagram illustrates five kinds of exhaust abnormal failure analysis. 1 row of black smoke is characterized by difficulty in starting, row of black smoke; low-speed exhaust serious, high-speed exhaust to reduce or disappear; low-speed exhaust normal, rapid acceleration of smoke and serious; various speed conditions, continuous or broken