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柴油公交车在起步加速时,由于涡轮增压器响应滞后及机械与气体的惯性影响,造成进气量不足,排气烟度急剧升高。作者试图通过公交车上压缩空气系统,对涡轮增压器实施提前补气的途径来进一步改善柴油公交车起步加速冒黑烟的问题。探讨了在公交车上采用提前补气方案的设计思路,设计了控制系统,提出了具有自学习功能的补气起始时刻控制模式和基于发动机转速的补气终止时刻控制方法。通过在CA6DL1柴油机上分别作不补气、根据油门变化率补气和提前补气对柴油机烟度排放影响的实验。实验证明:该系统能缩短进气管建立压力的时间,进一步增加进气管增压压力;同时,与不补气和根据油门变化率补气相比,碳烟排放显著降低。
Diesel buses in the initial acceleration, due to turbocharger response lag and the inertia of machinery and gas, resulting in insufficient intake, exhaust smoke sharply increased. The author attempts to further improve the diesel bus to speed up the black smoke emission problem by means of the compressed air system on the bus and the way of prematurely boosting the turbocharger. In this paper, the design idea of using advanced gas supply scheme in buses is discussed, and the control system is designed. The control strategy of qi starting time with self-learning function and the control method of qi gas termination time based on engine speed are proposed. Through the experiment on the CA6DL1 diesel engine, respectively, do not gas, respectively, according to the rate of change of gas and make up for gas on diesel engine smoke emissions experiment. Experiments show that this system can shorten the time of establishing pressure in the intake manifold and further increase the boost pressure of the intake manifold. At the same time, the emission of soot is significantly lower than that of the non-supplemented and the supplemented according to the change of the throttle.