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SCR 시스템 분사노즐 막힘에 의한 UREA 역류 방지 방안 개발
신재석(Jeaseok Shin),이강웅(Gangwoong Lee),조병룡(Byoungyong Cho),김유겸(Yukyeom Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Diesel engine vehicles that have to reduce Nox of exhaust gas for strictness emission regulation are using a SCR system. In the case that the vehicle equipped the SCR system of BOCSH company, the name of main process returning all UREA back to the tank when engine turn off is AFTERRUN. It will be a problem if UREA is flew backward from the tank by blocked dosing nozzle when AFTERRUN process is finished. This study defines the main factor of nozzle blocking phenomenon and makes sure that solutions have an effect to prevent nozzle blocking and UREA back flow by testing on commereial vehicles. Throughout the testing on a bus and truck, this study has a conviction that solutions can be used on vehicles which have variable SCR layouts.