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1.6L 가솔린엔진에서 엔진 오일 상태에 따른 OCV 특성
신윤섭(Yunsub Sin),박상훈(Sanghoon Park),이경우(Kyungwoo Lee),손출배(Chulbea Son) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
Currently, the automobile industry prefers high fuel consumption vehicles due to depletion of petroleum resources. In order to cope with increasing exhaust gas regulations, it is required to improve or develop various technologies such as supercharger application, light weight of vehicles, installation of aftertreatment device, downsizing of engine, And the like. Recently, gasoline vehicles have been adopting a CVVT (Continuously Variable Valve Timing) system that freely adjusts valve opening and closing times and periods according to the rotation range of the engine. The CVVT optimizes the valve timing in all operating ranges to improve output and torque and adjust valve overlap to reduce NOx and HC emissions, which are hazardous emissions, using internal EGR. Since the CVVT system is operated by oil, a device that can control the oil is needed. Its component is the oil control valve (OCV). The OCV adjusts the valve overlap by adjusting the opening and closing timing and duration of the valve by sending and exhausting engine oil to the crankcase and advance chamber of the CVVT system. In this paper, to evaluate the characteristics of OCV (Oil Control Valve), which is a core part of CVVT system, the response test and the stability test of valve according to the temperature and viscosity of engine oil were carried out in motoring engine condition. Test results show that the valve response is lower when the oil temperature is lower than when the temperature is higher. The lower the viscosity of the engine oil at lower temperatures, the better the response.
1.6L 가솔린엔진의 시제품 OCV 성능 평가 및 OCV 교체에 따른 연비 및 배출가스 비교
신윤섭(Yunsub Sin),박상훈(Sanghoon Park),이경우(Kyungwoo Lee),손출배(Chulbea Son) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
Currently, the automobile industry is developing or improving various technologies in order to cope with exhaust emission regulations and depletion of petroleum resources. These technologies include lighter cars, supercharger installation, after-treatment installation, engine downsizing, and variable valve timing. Recently, CVVT (Continuously Variable Valve Timing) system, which is a technology applied to gasoline vehicles, is used to freely adjust valve opening and closing times and periods according to the engine rotation range of the vehicle. This system, also referred to as variable valve timing, optimizes the valve timing in all operating areas of the engine to improve output and torque and adjust valve overlap to reduce harmful emissions using internal EGR and improve fuel economy. Since such a CVVT system is operated by engine oil, a device that can control the oil is needed. The component is an oil control valve (OCV). The OCV is a key part of the CVVT system, which regulates the opening and closing times of the valves by injecting oil into and out of the crankcase and advance chamber in the CVVT system. In this paper, we compare and evaluate the performance of the existing OCV and the prototype OCV under development, and compare the fuel consumption and exhaust gas amount by replacing the OCV.