基于Ascet平台的高压共轨柴油机电控EGR控制策略研究

针对电控EGR控制策略,结合电控系统模块化的设计思路,设计了基于Ascet平台的电控发动机EGR控制系统。通过对转速、油量等参数进行标定,运用Ascet软件实现了EGR控制模型的模拟仿真,保证了系统稳定性及可靠性,加快了EGR系统的响应速度,实现了对排气再循环系统的闭环控制。将调试好的EGR电控系统安装在高压共轨柴油机上,在标定转速3 600 r/min下进行试验,试验结果表明,EGR控制系统能够按照控制策略实现对EGR的精确控制,与原机相比,NOx排放下降明显。

Control Strategy for Electronic Control EGR of High-pressure Common Rail Diesel Engine Based on ASCET Platform

For the control strategy of electronic control EGR,the EGR control system of electronic control engine was designed in combining with the modular design concept based on the Ascet platform.By optimizing the speed and fuel quantity parameters,the simulation of EGR control model was realized with the Ascet software.The optimized model assured the system stability and reliability,improved the response of EGR system and realized the closed loop control on exhaust recirculation.Finally,the debugged EGR electronic system was assembled to a high-pressure common rail diesel engine and tested at the rated speed of 3 600 r/min.The results show that the EGR control system can acquire the accurate control of EGR according to control strategy,which make NOx emission decrease obviously compared with the original engine.