The Design of Urea Dosing Unit in Diesel Engine SCR System

摘要

The urea dosing unit in the diesel engine SCR system, real-time calculates and delivers the quantitative urea, which is vital to the reduction of the NOx emission. Considering the practical condition, according to the function of the urea dosing unit, based on the pump controlling quantitative and air assisted atomization principle, the mechanical part of dosing unit is designed. Also based on the consideration with versatility and openness of the unit, the control part of dosing unit is designed. At last, based on the the common and open platform founded by designed urea dosing unit, which is composed of mechanical part and control part, the SCR control module and dosing module are developed. At last, the designed dosing unit is examined by the engine ETC test. The ETC test results indicate the design achieves the intended purpose.