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엔진 냉각 회로를 이용한 저온에서의 우레아 인젝터 온도 제어 연구
백종경(Jonggyoung Baek),박재형(Jaehyung Park),권대용(Daeyong Kwon) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
As exhaust gas regulations have been strengthened recently, the application of the SCR system is increasing, and the performance of the urea injector is becoming important. In the SCR system, the urea injector injects urea into the exhaust pipe. When the urea injector does not operate at the proper time and injection amount, the amount of NOx in the exhaust gas increases. In order to improve the performance of the urea injector, it includes a water-cooled or air-cooled cooling system considering the urea water quality. However, at low temperatures, the cooling system may be out of operating temperature and may not work. Therefore, regulations on exhaust gas regulate the urea injector to operate within 15 minutes after starting when the urea is frozen. This study aims to describe the temperature control method of the urea injector which satisfies exhaust gas regulation at low temperature by using the engine cooling circuit.