• 대한기계학회논문집B
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• 제37권1호
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• pp.59-65
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• 2013

본 논문은 차량용 에어컨 압축기가 실차 연비에 미치는 영향에 대하여 실험적으로 연구한 것으로, 본 연구의 목적은 연비에 주요한 영향 인자인 압축기의 토출 용량별 구동 토크에 의한 실차 연비 기여도를 분석하는 것이다. 연비에 직접적인 영향을 주는 압축기의 부하를 측정하기 위하여 압축기 클러치에 직접 부착하는 토크 센서를 개발하였으며, 실차 평가전 벤치 토크 미터와의 비교 평가를 통하여 토크 센서의 신뢰성을 검증하였다. 토크 센서가 부착된 압축기를 장착한 차량을 환경 풍동에서 연비 측정을 할 수 있도록 장치를 구성한 상태에서 연비 평가를 수행하였다. 압축기의 토출 용량에 따른 구동 토크는 연비에 직접적인 영향을 주며, 동일 사양 압축기에서 토출 용량이 약 11% 커질 때 연비는 약 2~3% 악화됨을 알 수 있었다.

• 실천공학교육논문지
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• 제15권1호
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• pp.127-132
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• 2023

Roll to Roll (이하 RTR)로 연결된 유연회로기판(이하 FPCB)에서 일정한 장력을 유지하여 안정적인 홀 가공이 가능하게 하는 Dancer Roll System를 경량화하고 서보모터를 활용한 토크 제어를 통해 기존 방식 FPCB RTR에서는 대응 불가능하였던 중력가속도의 2배가 되는(이하 2.0G) 가속도의 고속 가공이 가능하도록 요소기술과 성능 지표를 제시한다. 기존 마그넷 클러치 방식 RTR에서는 달성이 불가능하였던 높은 회전수와 발열 문제, 낮은 토크 문제등을 마그네슘 소재를 이용한 Roll의 경량 가공법 개발과 서보모터의 토크 제어 알고리즘 개발을 통하여 해결하여 FPCB에 균일한 장력을 제공하고 토크 안정성을 높인다. 본 연구에서 개발한 요소 기술로 인해 Dancer Roll의 반응속도가 개선되어 목표한 고속화를 달성하였다.

• 유공압시스템학회논문집
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• 제6권1호
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• pp.10-16
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• 2009

Automatic power transmission systems consisted of a torque converter and several planetary gear sets, clutches and brakes are controlled by a hydraulic shift control circuit and an electronic transmission control unit. The hydraulic circuit serves for the operation of the torque converter and lubrication oil supply of the transmission system as well as for the actuation of clutches for the automatic gear shift. The complicated hydraulic control circuit constructed by many spools, solenoids, orifices and flow passages are integrated into one small valve block and it is powered by one hydraulic pump. In this paper, a test equipment was developed to measure the oil consumption of each component at various wide operating conditions. Test data about 730 sets acquired from five test items are analyzed and discussed on the oil capacity of the circuit.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.313-317
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• 2005

Precision motor dynamometer is requiring for nano positioning control performance recently. Particularly, linear motor is using rapidly and the dynamometer needs is increasing. In this study, a precision control dynamometer is designed using MR (Magnetic Rheological) damper. The ultra precision motor system including the driver and controller is tested using the MR damper dynamometer. This dynamometer is able to measure torque for rotary motor or traction force with linear positioning accuracy for linear motor system.

• 한국정밀공학회지
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• 제31권10호
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• pp.935-945
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• 2014

This paper presents a new road generative system that employs a pad of preventive overspeed or tollgate. The system consists of pad, shaft, torsional damper, oneway-clutch, gear system, and electricity generator components. When the car driven through the road generation system, it occurred to surplus energy in the DC power. In order to maximize the power of electricity energy harvester, the simulation software is developed. It is used to determine parametric dimension for optimal design with the theoretically calculated results from the simulation software. The transient responses at the conditions of low and high vehicle speed are compared with the calculated results as torque, impact force, power, out energy etc. Consequently, before design a road generation system, the analysis of simulation results shows that the proposed concept and system has efficiency and confidence.

• 동력기계공학회지
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• 제6권2호
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• pp.73-81
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• 2002

In this study, electronically controlled automatic transmission adopted on a subcompact model in the market was modelled, and the driving performances of the transmission were simulated with the models. Kinetic and dynamic models of working components are established. The driving simulation program is developed with those models, and the various driving conditions are analyzed. With the results, the dynamic behaviour of the engine and the automatic transmission is easily understood. Especially, the transient performances of torque converter and clutches are deeply analyzed. Skipping the vehicle road test by using this analyzing tool, we can expect the cost down and the reduction of the development period of automatic transmission.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 F
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• pp.2139-2141
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• 1998

This study was carried out about the manufacture of test equipment for traction Motor Driving. The power converter is driven by two converter serially and keep a high power factor of power source. This system is haven all the characteristic of voltage source converter by having a processing ability of regenerating power. The traction motor is controlled by IGBT inverter. The test equipment is composed of traction motor, torque-meter, clutch, and inertia body of tubular type.

• 한국자동차공학회논문집
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• 제13권6호
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• pp.99-104
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• 2005

The CARB in USA has demanded OBD functions that detect any deterioration of performance of OTS as well as a simple defect of OTS which can affect emission to meet the reinforced emission regulation. In this paper, OTS plausibility monitoring functions to meet the demand from CARB are discussed. The output from OTS is used for the diagnostics of the torque converter clutch stuck and the gear ratio synchronous error. It is possible to diagnose the abnormality of OTS function by considering the oil temperature characteristics which changes according to the driving status of vehicles. In result, the OBD regulations of the CARB can be satisfied obligating car manufacturer to detect any problems in OTS functions which can affect emissions.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.131-136
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• 2004

The limited slip differential(LSD) is a device which enables the driving force to be transmitted from one slipping wheel to another wheel in such case that the car is stuck in clay or snow. When the unwanted slipping occurs on one wheel, the LSD temporarily restraints the differential motion to transmit the driving force in the other wheel. So far, many types of LSD were developed such as mechanical lock type, disk clutch type, viscous coupling type, torsion type and multiple clutch type. However these types of LSD is too complicated and expensive, so it is used only for 4WD outdoor vehicles, military vehicles, and a portion of deluxe car. So, many studies has been devoted to improve new types of LSD to cover those demerits of existing LSDs that the hydraulic LSD is developed as arepresentative result of that. The hydraulic LSD which uses the principle of gear pump is packed with viscous oil in tight container. When a slip occurs on one wheel, the hydraulic LSD generates torque caused by high oil pressure in the container. This study has been devoted to suggest an improved hydraulic LSD. In order to achieve it, we designed a new type of hydraulic LSD, produced it and did a rig test with it on real vehicle. From the rig test, it has been confirmed that the new type of hydraulic LSD can be directly applied to exiting vehicles without changing the design criteria

• 에너지공학
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• 제23권3호
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• pp.163-173
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• 2014

본 연구에서는 도로용 발전장치 최적화 설계를 위해 실험과 수치해석을 다루었으며, 도로용 발전장치는 패드, 축, 토셔널 댐퍼, 일방향 클러치, 기어, 발전기 등의 여러 가지 기계요소를 포함한다. 본 수치해석은 도로용 발전장치의 성능을 평가하기 위하여 개발되었으며 소프트웨어에 의하여 이론적으로 계산된 결과값을 사용하여 최적화 설계의 변수인자를 결정하게 된다. 이러한 변수는 장치의 용량, 길이, 각도 등이며, 차량의 운전상태에 따라서 토오크, 출력 및 생성된 에너지값 등의 결과값을 비교하여, 도로용 발전장치를 설계하기 전 수치해석을 통해 제안된 개념과 시스템이 효율성과 신뢰성을 갖도록 한다.