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柴油机EGR与VNT的干扰调节控制系统

, PP. 149-152

Keywords: 汽车工程,干扰调节,建模,EGR,VNT

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Abstract:

在带有废气再循环(EGR)和可变喷嘴涡轮增压器(VNT)的柴油发动机中,EGR与VNT工作过程中会出现相互之间的互扰。在发动机转速和喷油脉冲改变的瞬时状态下,设计和调整常规的PID控制器特别困难。针对这种情况提出了1种基于模型控制的瞬态和稳态控制系统。该控制系统在传统的PID控制基础上,利用空气动力学与传热学,优化并建立3个主要的控制模型,包括多输入多输出(MIMO)切换控制器,动态反馈器和干扰观测器。通过试验验证,EGR和VNT之间的干扰得到有效调节;在控制过程中,空气质量流量与进气歧管压力的响应延迟得到改善,并且NOx的排放量明显减少。

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