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Automatic Parking System using Background Subtraction with CCTV Environment
Jungseok Cho,Jinrak Park,Untae Baek,Donghyun Hwang,Seibum Choi,Soohyun Kim,Kyungsoo Kim 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
In this paper, a new automatic parking approach that uses a surveillance camera is suggested. Many parking lots have surveillance cameras. Vehicle position, attitude, and parking space detection methods using a based on CCTV environment are introduced. An entire auto parking system is realized using a small experimental vehicle. Existing auto parking systems are primarily ADAS (advanced driver assistance systems) that use extra sensors such as external cameras, ultrasonic sensors, and so on. The authors suggest an automatic parking system that does not impose an economic burden on drivers. Instead, drivers can use an automatic parking system based on CCTV environment, a central process computer, and a communication method between the computer and the driver’s car.
ENGINE NET TORQUE COMPENSATION THROUGH DRIVELINE TORQUE ESTIMATION IN A PARALLEL HYBRID VEHICLE
Jinrak Park,Seibum Choi,Jiwon Oh,Jeongsoo Eo 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.3
In recent years, interest in smart and green vehicles has increased. There are many cases where engine net torque related control is performed when building smart and green car systems. Speed tracking control in autonomous driving, or optimal transmission shift control is an example. The engine net torque is the sum of the engine indicated torque, accessory load torque, and frictional torque, and the starter motor torque in the case of a parallel hybrid vehicle. However, the estimation error of these torque items can cause the estimation error of the engine net torque. In this paper, a compensation method for the slowly varying uncertainty of the engine net torque in a parallel hybrid vehicle using a multiplicative constant is proposed. The adaptation of the multiplicative constant is conducted using the amount of change in the engine net torque estimated in the backward direction of the driveline. The proposed algorithm is verified based on production vehicle data.
Adaptive slip engagement control of a dry clutch using a clutch torque estimator
Jinrak Park,Seibum Choi,Jiwon Oh,Jeongsoo Eo 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
A dry clutch is an important part in a vehicle powertrain system and the dry clutch is primarily utilized for small and medium sized vehicles. The slip engagement is a method of engaging a clutch in a state where the speeds of both sides of the clutch are different. When a clutch is slipping, energy loss due to clutch friction, and clutch wear occurs. Therefore, it is necessary to control a clutch precisely in slip engagement of a clutch. A clutch friction model is needed to implement feedforward control in clutch slip engagement control, but there are some uncertain parameters in a clutch friction model. In this study, a clutch friction coefficient and a clutch touch point are represented as uncertain parameters of a clutch friction model. Thus, a simultaneous adaptation method of a clutch friction coefficient and a clutch touch point in a clutch friction model, and a feedforward control method of slip engagement of a dry clutch using the adaptation method are proposed in this study. The proposed adaptive control algorithm was verified with the slip engagement simulation of a dry engine clutch in a parallel hybrid vehicle in the MATLAB/Simulink environment.
Adaptive torque tracking control during slip engagement of a dry clutch in vehicle powertrain
Park, Jinrak,Choi, Seibum,Oh, Jiwon,Eo, Jeongsoo Elsevier 2019 Mechanism and machine theory Vol.134 No.-
<P><B>Abstract</B></P> <P>Dry clutches have been gaining its popularity for use in the transmission systems of small and medium-sized vehicles as well as the engine clutch systems of parallel hybrid vehicles. With this trend, the ability to appropriately control the amount of torque transferred through the dry clutch becomes important. This paper addresses a feedforward control method of clutch torque during slip engagement of a dry clutch utilizing a clutch friction model. In many studies, the clutch friction coefficient is considered as the only uncertain parameter in the clutch friction model. However, the clutch touch point can also serve as a major source of uncertainty in the clutch friction model. Thus, this paper proposes a simultaneous adaptation method to estimate the clutch friction coefficient and the clutch touch point in real time and a feedforward control method of clutch torque during slip engagement of a dry clutch based on the proposed adaptation algorithm. This control approach is applied to the slip engagement control of a dry engine clutch in a parallel hybrid vehicle and its effect is experimentally verified using a production vehicle.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An adaptive torque tracking control method during slip engagement of a dry clutch in a vehicle powertrain is developed. </LI> <LI> The proposed method is applied to the slip engagement control of an engine clutch in a parallel hybrid vehicle. </LI> <LI> The proposed method is verified with production vehicle experiments. </LI> <LI> Feedforward control based on a clutch friction model is performed for the slip engagement control. </LI> <LI> The forward path torque estimator of an engine clutch in the driveline is utilized to adapt the clutch friction model. </LI> </UL> </P>
클러치 슬립 체결 시 최적화 레퍼런스 슬립 속도 생성 방법
박진락(Jinrak Park),최세범(Seibum Choi) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
전세계적으로 자동차 환경 규제가 날로 강화되고 있으며 자동차는 전자화로 인하여 점점 지능화 되어가고 있다. 이에 따라 자동차의 효율 증대와 승차감 개선에 관한 관심이 늘고 있다. 자동차 파워트레인에서 클러치의 적절한 제어는 자동차 효율을 높이고 승차감을 개선하는데 큰 역할을 할 수 있다. 선행 연구에서 클러치 슬립 체결 제어 시 클러치 슬립 제어 및 클러치 전달 토크 제어와 같은 하위 제어기에 관해서는 많이 다루어져 왔다. 한편 클러치 슬립 제어 시 레퍼런스 클러치 슬립 속도 및 클러치 전달 토크를 생성하는 방법에 관해서는 연구가 많이 진행되지 않았다. 따라서 본 연구에서는 자동차 파워트레인에서 클러치 슬립 제어시 클러치 슬립 에너지 손실과 승차감을 최적화하는 레퍼런스 클러치 슬립 속도 생성 방법에 관하여 다루고자 한다.
퇴적층의 온도별 배양에 따른 조류군집 형성과 이취미물질 발생 특성
김용진 ( Yongjin Kim ),윤석제 ( Seokjea Youn ),김헌년 ( Hunnyun Kim ),황문영 ( Moonyoung Hwang ),박진락 ( Jinrak Park ),이병천 ( Byoungcheun Lee ),이재관 ( Jaekwan Lee ) 한국물환경학회 2015 한국물환경학회지 Vol.31 No.5
We analyzed the formation of phytoplankton community and the occurences of odorus compound from benthic cyanobacteria in North, South Han-River, Paldang-Lake and Kyeongan-Stream sediments. Sediments were incubated in different water temperature. Akinetes were found (0~500 cells/g) with the highest number on sediment in Yangsoo railroad bridge (YC). The result showed that Anabaena ranged between 0.02~0.53×103 cells/mL in Sambong (SB), YC, Mukhyen-Stream (MS), Paldang-Lake (P2) and Kyeongan-Stream (KK). The total 68 taxa of phytoplankton were observed during the incubation period. A standing crop of phytoplankton was in the range of 0.13~8.97×103 cells/mL and Microcystis appeared in SB, YC, P2 and KK sites with 20~25°C temperature. In South Han-River (P3), Oscillatoria tenuis was dominant at 25°C temperature. The concentration of geosmin was the highest in SB-15°C (25.5 ng/L), and the concentration of 2-MIB was the highest in P3-25°C (286.8 ng/L). Odorous compounds were detected in all the temperature conditions from each site. Our results indicate that the dominant benthic cyanobacteria (O. tenuis, O. limosa, Phormidium tenue and Pseudanabaena limnetica) have high correlation with the occurrence odorous compounds and 2-MIB.