Study on the application of different EGR closed-loop control
YAO Wang
PANG Bin
ZHANG Chen
DU Feifei
LUAN Junshan
NIU Hongbin
Abstract：Based on the measurement principles and control strategies of different closed-loop control methods for exhaust gas recirculation(EGR),the steady-state fresh air measurement accuracy and transient emissions are compared by bench tests,and the control accuracy and transient emissions differences of different closed-loop control methods are analyzed.The results show that the two closed-loop control methods based on fresh air volume and EGR rate have high accuracy,and the relative deviation of fresh air measurement is less than±3%and±5%,respectively.The maximum relative deviation of measurement in low load based on closed-loop control of exhaust gas oxygen concentration is-10%.The closed-loop control based on fresh air volume had a fast closing rate of the EGR valve and a peak in NOxemissions during transient testing cycles.The closed-loop control of EGR rate based on Venturi flowmeter can effectively balance the flow of fresh air and EGR exhaust gas,which meets the power requirements of diesel engines and effectively controlls emission pollutants.
Keywords：diesel engineEGREGR rateclosed-loop control
Publication Date：2023-12-28
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 77-83 )