摘要
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。
The interference between exhaust （VNT） occurs in diesel engine with EGR and inject pulse, it is very difficult to design or gas recirculation （EGR） and variable nozzle turbocharger VNT. In the transient states of changing engine speed and adjust conventional proportional integral derivative （PID） controller. Aiming at this situation, a transient and steady control system based on model control is proposed. Based on conventional PID controller, the control system utilizes aerodynamics and heat transfer theory to optimize and establish 3 main control models, including multi-input multi-output （MIMO） switchover controller, dynamic feedback controller and interference observer. It is experimentally proved that （ 1 ） the interference between EGR and VNT is successfully regulated; （2） the response time of mass air flow （MAF） and intake manifold pressure can be improved, and the discharge amount of NOx can be significantly reduced in process control.
出处
《公路交通科技》
CAS
CSCD
北大核心
2013年第3期149-152,158,共5页
Journal of Highway and Transportation Research and Development
基金
教育部博士点基金项目(200802520001)
关键词
汽车工程
干扰调节
建模
EGR
VNT
automobile engineering
interference regulation
modeling
EGR
VNT
