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이충근(Chunggeun Lee),이정호(Jeongho Lee),이한홍(Hanhong Lee),손민호(Minho Son),이대엽(Daeyup Lee) 한국생산제조학회 2018 한국생산제조학회지 Vol.27 No.4
As the mass production and mass consumption industries are settled, they are promoting depletion of natural resources and causing the problem of global warming. Therefore, various studies are under way to pursue resource utilization and environmental protection at the same time. In Europe and the United States, the remanufacturing industry, which was settled early, has emerged as an alternative industry to mitigate resource and environmental problems. In this research after using a diesel engine, the engine parts were restored just before disposal. The cylinder block was selected according to weight and economic value. The mass of the selected cylinder block is about 246 kg. When the worn parts were restored, the restoration process used about 200 g of mass. as the result of restoration process, weight 246 kg cylinder block was prolonged the lifetime by using 200g.
[응용논문] 디젤 커먼레일 소형 인젝터 컨트롤 밸브 수명복원 기술개발
이충근(Chunggeun Lee),이정호(Jeongho Lee),이한홍(Hanhong Lee),이대엽(Daeyup Lee) 한국자동차공학회 2018 한국 자동차공학회논문집 Vol.26 No.4
This study aims to develop a technology to restore the remanufacturing performance by processing the worn parts of a small diesel injector control valve. In order to restore the performance of the control valve, cutting and grinding processes are applied at the maintenance and adjusting processes in remanufacturing. An exclusive grinding machine and a zig are designed and developed in order to restore the needle valve inclined plane, which is 83° in this work. The end of the needle valve is cut by 0.1 ~ 0.2 mm during the restoration process and then the coating process is applied. In this study, restored control valve performance is evaluated similar to that of the new one due to the existing DLC coating method through the injector performance test.
[응용논문] 상용 디젤엔진용 공기압축기 재제조 성능 복원에 관한 연구
이충근(Chunggeun Lee),이정호(Jeongho Lee),김바다(Bada Kim),이한홍(Hanhong Lee) 한국자동차공학회 2021 한국 자동차공학회논문집 Vol.29 No.4
The establishment of mass production and mass consumption industries has resulted in global warming problems and depletion of natural resources. Therefore, various studies are being conducted in order to simultaneously pursue resource utilization and environmental protection. In Europe and the United States, the remanufacturing industry was established from its earliest days, and it has emerged as an alternative to mitigating resource and environmental issues. In Korea, research related to remanufacturing is conducted in a variety of industries. In this study, the remanufacturing process was applied to the diesel engine air compressor for commercial vehicles. In particular, the performance verification of the remanufactured air compressor was carried out by designing and applying additional parts for the structural change of the middle plate. By using additional parts(2 g), remanufacture was made possible by restoring the performance of the 18 kg air compressor, as well as the 1.2 kg middle plate.
상용차 디젤의 연료분사장치 유닛 인젝터 핵심부품인 스필 밸브의 성능 복원 관한 연구
이충근(Chunggeun Lee),이정호(Jeongho Lee),이대엽(Daeyup Lee) 한국자동차공학회 2017 한국 자동차공학회논문집 Vol.25 No.3
Restorations of automotive parts have been done ever since the first vehicle was produced. Because the most expensive parts of a vehicle are in the engine system, there have been various restoration methods developed for engine parts. In the case of commercial diesel engines, the fuel injection device is a key and expensive component. It also has a significant effect on vehicle performance. In particular, reduced engine power and increased exhaust gas emissions may result from mechanical damage due to abrasion of the spill valve in the fuel injection system of a diesel engine. In this paper, restoration techniques for damaged parts are applied to restore the abrasion of a spill valve of fuel injection, also called as the “unit injector”, of commercial diesel engines. In order to recover the damage, optimized polishing techniques using hard-metal and coating processes are applied. To evaluate restoration techniques for the spill valve, performance and durability tests are performed on a test bench.
LPG 직분 연료 공급 시스템에서 연료 리턴에 의한 연료 냉각효과 연구
이정호(Jeongho Lee),이종혁(Jonghyeok Lee),이충근(Chunggeun Lee),이진학(Jinhak Lee),이대엽(Daeyup Lee) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
In order to meet the emissions standards for PM and PN, a development of technology for LPG SIDI(Spark Ignition Direct Injection) fuel supply system and for its application are necessary. Prevention of a vapor lock with use of LPG fuel leads to begin this work. The purpose of this work is to provide optimum design methods for preventing the locking of the fuel vapor from the LPG fuel supply system, and contributes to construction of the designed data. An effect of fuel cooling by returning some fuel from the high pressure pump to the fuel tank is identified using a rig system with Butane/propane= 70%/30% fuel, which enables to estimate the increase of temperature to slow down up to max. 1.4 times. As returning amount of fuel increases, an effect of cooling fuel pump varies and thus an excessive use of low pressure pump leads to the durability and fuel economy problems. Therefore, this work suggests the variable control of returning amount of fuel needs to be reviewed and applied. Measured results of temperature change of high pressure pump show that, after heating to high temperature, it is confirmed that a start of return(opening of return valve) lowers(cools) the temperature of high pressure pump. This concludes that low pressure pump(in-tank motor) enables to cool down the high pressure pump and thus reduce the start time at high temperature re-startability.