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연비와 동력성능 향상을 위한 차속 감응형 에어컨 시스템 개발
이창원(Chang Won Lee),김재웅(Jae Woong Kim),장기룡(Ki Lyong Jang),정기섭(Gi Seob Jeong) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
With the public interest in environmental conservation in recent years, the automobile industry now requires technological innovations to reduce fuel consumption. Innovative technologies demand that the air-conditioning system be of “a power-saving design”, which will reduce the engine emissions. In regulatory testing, the US EPA has included air conditioning operation as part of the Supplemental Federal Test Procedure (SFTP) known as SC03. With these new requirements, enhanced compressor control is essential to reduce power. With this in mind, the variable displacement compressor is more advantageous than other types. This paper describes the power saving air-conditioning control algorithms through cooperative control of the Power Train (P/T) and an externally controlled air conditioning (A/C) compressor. By coordinating the A/C system with the P/T, the algorithms reduce compressor displacement during vehicle acceleration to prevent excessive A/C cooling, and increase the compressor displacement to store the cool air during vehicle deceleration which will improve fuel consumption when driving. The power saving compressor control algorithms which do not affect passenger comfort is the main focus of this paper. The compressor variable displacement control for the reduction of fuel consumption requires various signal selections and a domain definition which can be used to judge the vehicle’s driving condition whether accelerating or decelerating. To maximize power saving and reduce fuel consumption, a careful consideration and application for an allowable wide range of target temperature of evaporator air outlet is essential to achieve this goal (the highest comfort temperature in acceleration and the lowest temperature in deceleration). A prototype test vehicle is operational and undergoing validation for thermal comfort and drivability. These evaluations include climatic wind tunnel tests and field tests. Fuel consumption during air conditioning operation has been tested by measuring the fuel usage. A 4~8% potential fuel usage reduction in SC03 and 2~3% reduction of fuel consumption in real road of both the city and public road were found and acceleration performance was also improved by about 2%.
김남훈(Nam-Hoon Kim),박종명(Jong-Myoung Park),한명철(Myung-ChuI Han),박원규(Warn-Gyu Park),장기룡(Ki-Lyong Jang) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
Since the mist of the automobile windshield interferes the driver's sight and safety, it is needed to develop an automatic de-mist equipment with coupling of the Automatic Temperature Control(ATC) unit of an automobile.<br/> The mist forms on the windshield glass when the temperature on the surface of glass is below the dew point temperarure. Therefore, it is needed to measure temperature of interior of a cabin and that on the windshield glass as well as the relative humidity. Throughout the experiments, the location of sensors are determined on the back-side of the rear view mirror. The Mist Possibility(MP) was defined as the difference of temperature between the dew point and the surface temperature of windshield glass. The automatic de-mist control system begins to operate if MP~_=O.<br/> It was observed that the automatic de-mist control system operates well and removes well the mist.
박종명(Jong-Myoung Park),김남훈(Nam-HoonKim),한명철(Myung-ChulHan),박원규(Warn-Gyu Park),장기룡(Ki-Lyong Jang) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
This paper describes the development of the automatic control device for demisting. The control is started from<br/> the mist possibility (MP) 0, Which is defined as the temperature difference between dew point and glass surface<br/> temperature.<br/> To find the efficient automatic demisting strategy, the changes of MP value in terms of interior and exterior<br/> temperature and relative humidity have been experimentally performed.<br/> Based on these experiments, the suitable automatic demisting control unit has set up and it has been found that the<br/> developed automatic demisting control unit could effectively eliminate the mist on the glass.