Study on the effect of EGR control parameters on turbocharged diesel engine

Abstract

Under transient conditions, the emission of turbocharged diesel engine will deteriorate to a certain extent, and the adoption of EGR is also a factor leading to the increase of some pollutants. For this reason, a high pressure common rail turbocharged and inter-cooled heavy duty diesel engine was used to study the influence of EGR closed-loop control method on the emission performance under typical transient conditions with constant speed and torque increasing in 5s. The results show: The NOx emission can not be effectively reduced when the air input is used as feedback parameter; When the intake oxygen concentration is used as feedback parameter, smoke emission will increase sharply; When exhaust oxygen concentration is used as feedback parameter, the smoke deterioration is less, the peak smoke is 15.8%. It has a better compromise relationship with NOx and fuel consumption, and can be used as closed-loop control parameter for diesel engine transient performance optimization.

Keywords

• turbocharged diesel engine
• transient condition
• egr
• exhaust oxygen concentration