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문성동 三陟大學校 2000 論文集 Vol.33 No.2
Speed control of the engine by the centrifugal weight type grvernor(CWG) is not adequated for maintaining the constant speed under the condition of load variation. To solve this problem, it is necessary to make I type control system as we call LQ or digital control methods. This paper was performed to develop a digital LQ control system for controlling the engine speed. To find out revolution equation using regression, the dynamic characteristics of engine revolution part was measured by open loop test. Thus, a transfer function and a discrete-time equation relating the engine speed as control system output to the torque equivalant to throttle opening angle as control system input were derived from the results of the open loop test. One computer simulation using digital LQ algorithm and discrete-time equation of the control system was performed to find out LQ gains depending upon optimum engine speed responses. The other computer simulation using digital LQ algorithm with optimum gains was performed to estimate the engine speed control performances. An object of the engine was of 5.5ps gasoline, air cooled. Throttle opening and closing control was operated by step motor with 0.72 degree per one step. To computer with PID control system in performances, PID control data were cited from before study by Y.B.Minl) The test results were summarized as follows: 1. Estimated engine speeds calculated from the discrete-time equation obtained by the open loop test were fitted well to the actual engine speeds. 2. Under the step input of the reference speed, the controlled responses by LQ at transient and steady state were better than those at PID 3. Under the step input of brake torque, the engine speeds by LQ were maintained at the reference speed constantly same as by PID 4. In the frequency response test the speed fluctuations by LQ were same as by PID only within the frequency range of 0.05-2 Hz of the brake torque.
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자동차 에어컨의 냉매충전량이 냉매순환라인의 온도와 압력에 미치는 영향
문성동,민영봉,문성원,정태상,강동현 경상대학교 농업생명과학연구원 2008 농업생명과학연구 Vol.42 No.3
This study was performed to present the diagnosis basis of optimum or shortage of refrigerant condition of air-conditioner by detecting the temperatures and pressures of refrigerant line. The car air-conditioner of SONATA III(Hyundai motor Co., Korea) was tested in room with controlled air condition at 33∼35℃ and 55∼57%RH. Measured variables were surface temperatures of entrance and outlet pipeline of compressor, condenser, receiver dryer, and evaporator, and entrance and outlet air temperatures of cooling vent of evaporator and condenser, and high and low pressure in the refrigerant pipeline. The control variable was refrigerant charging weight. It was represented that the refrigerant charging weight(Wr) effected little different on each of the temperatures and pressures with same appearance at both engine speeds of 1,500 rpm and 2,000 rpm. It seemed to be able to be done diagnosis of the refrigerant charging condition by measuring each of the temperatures and pressures at the 1,500 rpm appointed to the test speed due to consume lower energy. The temperature difference(Td) between entrance and outlet air of cooling vent of evaporator was most influenced by Wr and next influenced one was the high pressure(P1) in the refrigerant line. The optimum Wr referred to the guide book was 720 g, therefor it was considered that the optimum conditions of the air conditioner is when Td and P1 are 15℃ and 15 kgf/cm2 under 5% error. The normal condition of Td referred to textbook was over 12℃, therefore P1 at normal condition of the air conditioner is between 14 kgf/cm² and 16 kgf/cm². 본 연구는 에어컨의 적정냉매충전량 진단을 위한 자료를 제공하기 위하여 수행하였다. 공기 온도 33∼35℃, 습도 55∼57%RH로 조절되는 실내에서 SONATA III(Hyundai motor Co., Korea)자동차의 에어컨시스템을 대상으로 냉매충전 및 성능시험장치를 구성하고 냉매충전량 변화에 따른 냉매라인의 측정량으로 각 지점 온도와 고압 및 저압을 측정하고 분석하였다. 냉매라인의 측정온도는 압축기, 응축기, 리시버드라이어 및 증발기의 입구와 출구 파이프표면온도와 응축기와 증발기벤트 입구와 출구의 송풍공기온도이다. 이들 각 온도와 압력은 정도의 차이는 있으나 모두 냉매충전량(Wr)에 따른 영향을 받으며, 이들을 측정하여 냉매충전 정도를 진단할 수 있는 것으로 나타났다. 엔진회전속도 2,000 rpm과 1,500 rpm에 따른 각 측정량의 변화양상은 차이가 나타나지 않아 에너지사용량이 낮은 1500 rpm이 시험 회전수로 적당할 것으로 판단된다. 냉매충전량에 가장 큰 영향을 입는 측정량은 증발기벤트 입출구온도차(Td)이며, 그 다음이 냉매라인 고압측의 압력(P1)으로 나타났다. 1,500 rpm에서 Wr이 350 g까지 증가함에 따라 Td는 급격히 증가하다가 350g에서 700g까지는 12.8℃에서 16.7℃로 완만하게 증가하였고, 700g을 초과하면서 완만하게 감소하였다. P1은 Wr이 400 g까지 증가함에 따라 급격히 증가하다가 400 g에서 700 g까지는 14.3 kgf/cm2에서 16.0 kgf/cm2으로 완만하게 증가하였고 700 g을 초과하면 급격하게 상승하였다. 에어컨사용설명서에 제시된 냉매충전량이 720 g인 것을 고려하면 1,500 rpm에서 적정냉매충전량 진단은 5%오차범위에서 증발기벤트 입출구 공기온도차가 15℃, 고압측압력 15 kgf/cm2일 때로 추정된다. 에어컨상태가 정상인 진단은 Td가 12℃이상과 P1이 14 kgf/cm²에서 16 kgf/cm² 사이일 때로 판단된다.
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문성동 三陟大學校 2000 論文集 Vol.33 No.2
The design of transplanting mechanism is of great importance, because the precision of crop transplantation after transplanting is dependent on transplanting point kinetic loci of transplanting mechanism for transplanter. The study introduced a working model basic interpretation technique which used with computer four bar linkage move mode mostly available to transplanting mechanism reducing the efforts and inaccuracy when using the conventional diagram solution. For the transplant spacing of 20∼40cm, the value of traveling speed/crank revolution speed be between 20 and 40cm. With the transplanting mechanism analysed in this study, for 1 to 5cm of the traveling distance on the ground the vertical angle of transplanting stand was estimated to be 0.5∼2.5。, which seemed to cause no problem to the growth of vegetables at the of transplanting.
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문성동 三陟大學校 産業科學技術硏究所 2002 産業科學技術硏究論文集 Vol.7 No.1
The results obtained are summarized of suitable onion plant machine to onion plant types in Korea. As follows; The invest of conventional vegetable transplanter related to data. Designed manufacture of sowing and transplanting equipment to be possible introduction of new transplanting equipment. To decide basic structure of onion transplanter, studied most suitable of main equipment part and using of result, designed manufacture of tractor sticking 6 type's onion transplanter trial machine. Improvement of point at issue through driving examination of trial machine and parking examination so development of possible merchandise onion transplanter. Developed trial machine's working efficiency appear 2.5 hour/10a effect 20 double of puller and appear exactly transplant efficiency 99% of transplanter success rate.
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문성동,이상옥 三陟大學校 産業科學技術硏究所 2003 産業科學技術硏究論文集 Vol.8 No.2
Heating control system of the greenhouse has been achieved by a simple ON-OFF control method conventionally. It has such disadvantages as decreasing of control accuracy and cycling of control response induced by- wide dead band. To solve these problems of OK-OFF control. serial evaluations for establishment of mathematical model of the heating control system of greenhouse, identification of the recursive model, analysis of characteristics of Proportional(P) control, Proportional Integrated Derivative(PID) control and Model Reference Adaptive Control(MRAC) based on digital control methods. respectively. and simulation and evaluation of the investigated control system were carried out. A computer system was used for measuring the weather condition and controlling the power devices. The experimental greenhouse consisted of three gutter-connected round roof. covered with two layer polyethylene film, and equipped an air-heater with an oil burner.
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