디젤 엔진의 ATF 빠른 웜업 효과가 연비 특성에 미치는 영향

In recent years, various technologies have been introduced for the purpose of improvement of the fuel economy at cold start. In particular, the technologies of the temperature rise of the engine coolant and the fast warm-up are the mainstream of the research field. The temperature rise technology is implemented with an electric thermostat and the upward adjustment of the opening temperature of the thermostat. Also, the fast warm-up technology is utilized by means of an electric water pump, a clutch water pump, or EHRS(exhaust heat recirculation system). This paper deals with the impact on the fuel economy characteristics by ATF(automatic transmission fluid) fast warm-up effects using the EGR gas waste heat in a diesel engine. The fuel efficiency improvement from the ATF warm-up effect is 2.5% according to the results from a chassis dynamometer test.