Effect of Electric-controlled Air Supplement Strategy on Smoke of Turbocharged Diesel Engine during Accelerating Process

The effects of different electric-controlled air supplement strategies on smoke during acceleration were compared through the experiment by changing acceleration time and bearing load of diesel engine. The results show that it costs 12 s when the engine switches from the conditions of 1 400 r/min and 50 N · m to 2 500 r/min and 100 N ·m, and the peak smoke of original engine decreases to 0. 420 m^-1 from 0. 602 m^-1 (about 30. 2% decrease) by adjusting the related air supplement strategy with the electric supercharger. Under the condition of initial air non-supplement, the high final frequency of electric supercharger was helpful to reduce the soot and the linear type response curve was easier to lead to a low smoke than S-typed response curve. While under the condition of certain initial air supplement, the ideal air supplement strategy should be slow first and then fast.