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스로틀 개폐에 따른 가솔린 엔진의 비정상상태 유량변화 특성
박경석(K. S. Park),고상근(S. K. Kauh),노승탁(S. T. Noh),이종화(J. H. Lee) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.3
In a gasoline engine, the characteristics of air flow is very important not only for the design of the intake system geometry but also for the accurate measurement of the induction air mass. In this study, an air flow rate measurement was conducted by using the hot wire flow meter at the up-stream of the intake port and the throttle. At the upstream of the throttle, the overshoot phenome-na of the air flow rate by fast throttle opening were analyzed with choked flow. At the upstream of the intake port, the cylinder variation of the air flow rate and the difference between fast throt-tle opening and closing were showed during the unsteady state by the throttle step change. The results of this study can be used for the design of the throttle valve geometry and cylinder by cyl-inder control.<br/>
연료량 변조법에 의한 연료분사식 가솔린엔진의 공연비 제어
박경석(K. S. Park),박진일(J. I. Park),고상근(S. K. Kauh),노승탁(S. T. Noh),이종화(J. H. Lee) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.3
For the air-fuel ratio control in a fuel injection SI engine, the Jump-Ramp control algorithm has been widely adopted by using the on/off type oxygen sensor. But the Jump-Ramp control method has limitation on treating the frequency and amplitude of the air-fuel ratio oscillation. This study suggests another feedback control logic named modulated fuel feedback control, which has a con-cept of pre-tuned air-fuel ratio oscillation. In the modulation method, the oxygen sensor output is not treated as on/off signal but as analog signal for feedback. By using the modulation method, the frequency and the amplitude of air-fuel ratio oscillation can be adjustable to some extent for improving the conversion efficiency of the Three-Way Catalyst. The result shows that the per-formance of the modulation method is better than that of Jump-Ramp control method in reducing the amplitude of the air-fuel ratio oscillation as well as in increasing the frequency of the air-fuel ratio oscillation.<br/>
박경석(K. S. Park),김중일(J. I. Kim),고상근(S. K. Kauh),노승탁(S. T. Noh),이종화(J. H. Lee) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.3
In this study an air flow meter was developed for MPI engine using ultrasonic sensors. The major characteristcs of the ultrasonic flow meter are high speed response, flow direction recognition and linear output. The air flow rate measurements were conducted at upstream of the throttle and intake manifold. The characteristics of the ultrasonic flow meter are compared with those of the Bosch hot wire flow meter at both steady and unsteady engine conditions.