Performance Characteristics of an Electronically Controlled EGR Valve for Diesel Engines

디젤엔진용 전자식 EGR 밸브의 성능 특성

  • 정진은 (한국기술교육대학교 기계정보공학부) ;
  • 진영욱 (한국기술교육대학교 기계정보공학부)
  • Published : 2007.04.30

Abstract

Lately, the modulated EGR system that includes EGR valve and EGR cooler is being installed in diesel engines fur the purpose of the simultaneous reduction of NOx and PM. In this study. we designed and constructed a test bench for the performance evaluation of the modulated EGR system, and tested an electronically controlled EGR valve for 2.0 L diesel engines. The performance of the EGR valve was evaluated in terms of the valve lift behavior. the valve opening/closing response, and the mass flow rate through the valve. The valve lift with respect to the duty ratio of PWM signal was non-linear, and followed a different path fur valve opening and closing, that is, hysteresis. The valve opening response was concluded satisfactory falling within the usual standard response time. For the duty ratio of 40 to 60%, the mass flow rate through the valve was observed to depend on the pressure difference across the valve as well as the duty ratio, while it solely depended on the pressure difference fur the duty ratio above 60%.

Keywords

Modulated EGR;EGR Valve;Performance Characteristics