• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.71-74
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• 2005

More than five pulleys are used in an automobile, such as crankshaft, water pump, air-con compressor, fan and power steering pump pulley. These pulleys are parts that need durability until retiring a car. But there is no design criterion for durability, so pulleys are designed by the experience of designer and trial and error. So, in this study, we carried out stress analysis at durability test condition and compared analysis results to durability test results. It is found that the design criterion for durability is defined as a safety factor and a safety factor is different according to the distance between the center line of v-grooves and the mating surface.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.904-905
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• 2011

본 논문에서는 기존의 EPS(Electric Power Steering) 시스템에 IPMSM을 적용하고 속도 및 위치를 검출하기 위하여 Magnetic Position Sensor를 사용하였다. 이�� Magnetic Position Sensor의 신호는 정현파의 출력을 갖지만 고조파의 성분으로 인하여서 파형이 왜곡되고 이러한 파형의 왜곡으로 인해 위치 검출의 오차를 갖게 된다. 본 논문에서는 이러한 오차를 줄이기 위하여 다구찌 기법과 3차원 유한요소법(3D FEM)을 사용하여 고조파를 저감시킬 수 있도록 여러 변수를 변화하여서 최적의 설계를 통하여 실제 실제 센서 출력과 비교하여 자동차 산업 전반에 기여 하고자 한다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.19 no.4
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• pp.98-107
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• 2005

Brushless DC motor(BLDCM) can be driven by 120[^{\circ}]$ square wave voltage and use PWM pulse patterns in two-phase feeding scheme to control the speed of the motor. This Paper introduces four PWM modes used BLDCM control system, and analyzes their different influences on the motor performances using a time-stepped voltage source finite element method. To verify the proposed computational method, we built the prototype motor for electrical power steering(EPS) and compared the predicted and the measured back EMF and phase current.

• Transactions of the Korean Society of Automotive Engineers
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• v.15 no.5
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• pp.56-62
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• 2007

In order to compare subjective and objective assessments, a passenger car was driven at several speeds over several road profiles. To measure the acceleration signals experienced by the seated subject who provided an subjective assessment, four triaxial translational accelerometers and one triaxial gyro sensor were mounted on the steering wheel and on the passenger seat and floor, respectively. Correlations were determined between the measured accelerations and the subjective assessments of 3 expert subjects and 9 general subjects using psychophysical power law.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.66 no.8
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• pp.1297-1302
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• 2017

Recently, SRMs are used in automobiles for power assistant steering, accessory motion control and traction drives. Especially in the motion control and traction drives, safety and efficiency are of paramount importance. The paper describes the essential elements faced in designing and constructing driving circuits for a switched reluctance motor for automobiles. An important factor in the selection of a motor and a drive for industrial application is the cost. The switched reluctance motor(SRM) is a simple, low-cost, and robust motor suitable for variable-speed as well as servo-type applications. With relatively simple converter and control requirements, the SRM is gaining an increasing attention in the drive industry. This paper presents a modified C-dump converter for Switched Reluctance Motor (SRM) machine application in the cooling system of automobiles. The experiments are performed to verify the capability of applicate control method on 6/4 salient type SRM.

• Proceedings of the KAIS Fall Conference
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• 2011.12b
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• pp.421-424
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• 2011

연비절감 및 조향감 향상을 위한 EHPS 시스템은 엔진 동력 기반의 HPS(Hydraulic Power Steering)시스템과는 달리 탈 엔진형 조향 기술로써 동력원인 BLDC 모터, 고압펌프 일체형 모듈, 상용 HPS 시스템의 기본 유압회로, 조향계 시스템 및 BLDC 모터를 제어하고 최적 조향력을 생성하기 위한 로직이 포함된 ECU로 구성되며. 주요구성 모듈은 펌프부, 모터부, 제어부로 분류된다. 본 논문에서는 펌프부의 외접형 Gear펌프의 시제품 제작하였고 구동토크 측정실험의 Data를 통해 기존 EHPS용 Gear펌프와 비교평가를 하였다.

• Proceedings of the KIEE Conference
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• 2001.07b
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• pp.904-906
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• 2001

This paper presents a magnetic circuit design procedure by using Response Surface Methodology(RSM) to determine initial and detail design parameters for reducing torque ripple in BLDC motor of Electric Power Steering (EPS). RSM is achieved through using the experiment design method in combination with Finite Element Method and well adapted to make analytical model for a complex problem considering a lot of interaction of design variable Moreover, Sequential Quadratic Problem (SQP) method is used to solve the relsulting of constrained nonlinear optimization problem.

• Tribology and Lubricants
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• v.19 no.6
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• pp.335-341
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• 2003

Recently, the automotive industry is being developed rapidly. On this, a demand of high quality performance­test­machine is increased too. But it is progressive technology that must be combined hydraulic, mechanic and electronic technologies. To construct this system, the design of oil hydraulic circuit, interface skill between sensor and personal computer, data acquisition & display system and integrated control are very important skill. Moreover, reliable data is obtained with vacuum system and complex heat exchange system. Therefore, in this study, we designed a performance­test­machine by using above key technologies and we also made a integrated PC control system using personal computer which is more progressive and flexible method than PLC control.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.23 no.4
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• pp.380-384
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• 2014

This study focused on identifying the major noise source in a tractor cabin using experimental methods. The noise levels in a tractor cabin for different engine revolution speeds were analyzed to identify the noise source. The results showed that the power steering unit (PSU) was the major noise source in a tractor cabin. The PSU was moved to the outside from the inside of the cabin in order to reduce the noise in the tractor cabin. As a result, the noise levels on the left and right sides of the operator in the tractor cabin were reduced by 6.8 and 3.9 dB, respectively. Finally, the window method was introduced to evaluate the contribution of the transmission noise. The orders of significance in the tractor noise were the front, bottom, and left area, successively.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 1997.10a
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• pp.225-231
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• 1997

This paper reports on the theoretical study of the delivery pressure ripples of a positive displacement vane pump which is widely used for automobile power steering. Pressure ripples occur due to the flow tipples which induced cam ring profiles and reverse flow from the delivery ports. In this paper, the mathematical model for analyzing the pressure ripples has been presented, and set of the differential equationshave been solved using the Runge-Kutta method. As the results of analysis, instant ideal flow ripples, internal pressure, delivery pressure ripples, and delivery flow ripples have been presented. Internal pressure was related to delivery pressure variations, and amplitude of pressure tipples was increased with rotational speed and delivery pressure.