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차실내 이산화탄소 농도 제어를 통한 A/C부하 감소 및 연비 향상
이정훈(Jeonghoon Lee),김영민(Youngmin Kim),오세원(Saewon Oh),박준규(Jungyu Park),김영길(Yeongkil Kim),김무용(Muyong Kim),구준모(Junmo Ku) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Automotive air conditioning decreases approximately 25% of the vehicle fuel economy in the case of the summer and about 10% per year. A recirculation air mode, in which outside hot air influx is blocked, can improve fuel economy because a ventilation loss covers more than 10% of thermal heat load, but long time stay in this mode cause discomfort in ventilation. According to the United States air quality-related standards, CO₂ concentration, 2000 ppm and later, may induce drowsiness and can lead to the possibility of a vehicle crash, so the CO₂ concentration control is important. In this study, NDIR-Non Dispersive Infrared- CO₂ sensor measured the cabin concentrations in real time, a recirculation air rate and airflow to the cabin improved fuel economy and comfort in ventilation. This algorithm came from response surface method through a lot of vehicle experiments and computer simulation results, In ambient temperature 35℃, humidity 40%RH, vehicle speed 80 ㎞/h, sunload 850W/m2, 2 persons boarding conditions, through cabin CO₂ concentration remained constant or below 1000ppm, fuel economy increased approximately 4.5%. Also, this paper proposed the integrated recirculating air control strategies to block exhaust gas inflow into cabin by AQS (Air Quality Sensor) system and prevent fogging on windshield glass using ADS(Auto Defog Sensor) system.
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