• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2011년도 춘계학술대회
• /
• pp.782-783
• /
• 2011

본 연구에서는 자동차 부품 가공공정에서 적용하는 캐스케이드 디버링(cascade deburring) 후 잔존하는 스틸볼(steel ball)을 자동으로 감지하기위한 시스템을 구현하였다. 구현된 시스템은 자화부, 검출부, 제어부, PC 모니터링부로 구성되었다. 스틸볼 착자화 및 감지 정밀도의 향상, 외부노이즈 대응능력 등의 환경 변화에 영향을 받지 않는 신뢰성이 뛰어난 성능을 갖는 시스템을 구현하고자 하였으며 이를 위한 미세 스틸볼 감지시스템의 착자화부를 구현하고 성능평가를 수행하였다.

• 산업기술연구
• /
• 제33권A호
• /
• pp.61-66
• /
• 2013

This paper is about the development of 80[kW] IPMSM(Interior Permanent Magnet Synchronous Motor) drive system for an electric vehicle. MTPA(Maximum Torque per Ampere) operation and flux-weakening operation for the optimal torque control of the IPMSM are presented. In this system, the torque control of the IPMSM is achieved by using the look-up table, which gives d- and q-aixs current references for the given torque command in the MTPA operation and flux-weakening operation regions. This look-up table is made by current injection tests, and from which the motor parameters are also estimated. The proposed system is verified by the experiment on the electric vehicle drive system, which consists of an 80[kW] IPMSM and an IGBT inverter.

• 자동차안전학회지
• /
• 제7권2호
• /
• pp.32-38
• /
• 2015

A sine with dwell test is well known as a test scenario for evaluation of performance of electronic stability control(ESC) on passenger vehicles and heavy commercial vehicles. However, when it comes to ESC for medium commercial vehicles, the test scenario has not been established yet. In this paper, the sine with dwell test was modified considering characteristics of medium commercial vehicles. The three main modifications of the original test scenario are the steering angle level, steering frequency, and loading condition of the vehicle. These modifications are derived from simulation study for different medium commercial vehicles. From simulation study, it was shown that the ESC system for medium commercial vehicle is objectively evaluated by the proposed test scenario. A clear improvement on vehicle stability was seen in the results when ESC system was used.

• 한국통신학회논문지
• /
• 제38C권5호
• /
• pp.454-463
• /
• 2013

스마트폰은 이미 보편화되었고 가전기기나 자동차 등의 각종 생활기기에 통신장치 및 센서가 내장되어 스마트폰과 연동되는 스마트 기기들이 연구 개발되고 있다. 또한 현재는 스마트폰을 이용한 단순한 리모컨이나 원격 제어장치, 사용자 인터페이스의 수준이지만 향후에는 스마트폰에 지능화 기술이 융합되어, 사용자나 기기, 생활환경의 속성을 반영하여 자동으로 기기들이 개인 맞춤형으로 설정되는 개인 환경 서비스 기술이 활성화될 것이다. 본 논문에서는 관련 서비스와 시스템 구조, 요소 기술에 관해 기술한다.

• 자동차안전학회지
• /
• 제5권1호
• /
• pp.50-55
• /
• 2013

When it comes to commercial vehicles, their unique characteristics - center of gravity, size, weight distribution - make them particularly vulnerable to rollover. On top of that, conventional heavy vehicle brake exhibits longer actuation delays caused in part by long air lines from brake pedal to tires. This paper describes rollover prevention algorithm that copes with the characteristics of commercial vehicles. In regard of compensating for high actuating delay, predicted rollover index with short preview time has been designed. Moreover, predicted rollover index with longer preview time has been calculated by using road curvature information based on environment information. When rollover index becomes larger than specific threshold value, desired braking force is calculated in order to decrease the index. At the same time, braking force is distributed to each tire to make yaw rate track desired value.

• 전력전자학회논문지
• /
• 제2권1호
• /
• pp.12-25
• /
• 1997

본 논문은 PNGV 계획에 따른 차세대 전기자동차의 개발을 위하여 고주파 교류 전력분배 시스템을 적용하여 이용할 수 있는 추진력 장치의 구현 가능성에 대한 조사 연구이다. 실행 가능한 관점에서 전력 분배와 에너지원의 결합이 쉽게 이루어 질 수 있고 변환이 가능한 여러 가지 형태의 시스템이 비교 검토되었으며, 현재 기술 수준으로 보아 가까운 장래에 실현 가능한 최적의 시스템 구성은 배터리와 내연기관엔진 및 유도전동기를 이용하는 하이브리드형이 제시되었다. 각 시스템의 원활한 전력수급과 운전특성을 위하여 단상 고주파 교류 전력분배 제어기법을 적용하였으며, 이 시스템의 타당성을 입증하기 위하여 시스템 구성에 따른 모델링과 컴퓨터 시뮬레이션을 실시하였다. 이 결과 차세대 전기자동차용으로 제시된 고주파 교류 전력분배에 의한 하이브리드형 추진력 시스템이 가능하며 운전특성도 우수함을 보여주었다.

• 한국전자통신학회논문지
• /
• 제15권1호
• /
• pp.101-106
• /
• 2020

본 연구는 다양한 어셈블리 부품의 용접부 내부결함을 검사하기 위한 초음파 탐상 장비 개발에 관한 것이다. 본 연구에서는 초음파 탐상을 위하여 시스템의 모션제어 S/W, 초음파 송수신기 제어, 결함 판정 기준 설정 등의 계측 S/W 등이 설계되었으며, 양품과 불량품의 비교분석을 하기 위하여 용접결함 불량품 샘플워크 등도 제작되었다. 이와 같은 구성으로 이루어진 시스템을 통하여 어셈블리 부품 용접부의 결함 위치 및 깊이에 대한 자동검사 기능을 수행할 수 있었으며, 종전에 전문가에 의해 이루어졌던 용접부의 내부결함에 대한 판단을 시스템이 수행하도록 하였다.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2008년도 추계학술대회논문집
• /
• pp.237-242
• /
• 2008

This paper presents vibration control of an active hybrid engine mount featuring magneto-rheological (MR) fluid and a piezostack actuator. On the basis of the conventional passive rubber mount, MR fluid is adopted to improve isolation performance at resonant frequencies, whereas the piezostack actuator is adopted for performance improvement at non-resonant frequencies, especially at high frequencies. Based on some particular practical requirements of engine mounts, the proposed mount is designed and manufactured. The characteristics of rubber element, piezostack actuator and MR fluid are verified for system analysis and controller synthesis. The model of the proposed mount with a supported mass (engine) is established. In this work, a sliding mode controller is synthesized for the mount system to reduce vibrations transmitted from the engine in a wide frequency range. Computer simulations are performed to evaluate the performances of the proposed active engine mount in time and frequency domains.

• 자동차안전학회지
• /
• 제5권1호
• /
• pp.62-68
• /
• 2013

This paper describes development of 4 Wheel Drive (4WD) Electric Vehicle (EV) based driving control algorithm for severe driving situation such as icy road or disturbance. The proposed control algorithm consists three parts : a supervisory controller, an upper-level controller and optimal torque vectoring controller. The supervisory controller determines desired dynamics with cornering stiffness estimator using recursive least square. The upper-level controller determines longitudinal force and yaw moment using sliding mode control. The yaw moment, particularly, is calculated by integration of a side-slip angle and yaw rate for the performance and robustness benefits. The optimal torque vectoring controller determines the optimal torques each wheel using control allocation method. The numerical simulation studies have been conducted to evaluated the proposed driving control algorithm. It has been shown from simulation studies that vehicle maneuverability and lateral stability performance can be significantly improved by the proposed driving controller in severe driving situations.

• 자동차안전학회지
• /
• 제14권4호
• /
• pp.70-76
• /
• 2022

This paper investigates the effects of age, gender, and situational factors on take-over performance in automated driving. The existing automated driving systems still consider a driver as a fallback-ready user who is receptive to take-over requests. Thus, we need to understand the impact of situations and human factors on take-over performance. 34 drivers drove on a simulated track, consisting of one baseline and four event scenarios. The data, including the brake reaction time and the standard deviation of lane position, and physiological data, including the heart rate and skin conductance, were collected. The analysis was performed using repeated-measures ANOVA. The results showed that there were significant age, gender, and situational differences in the takeover performance and mental workload. Findings from this study indicated that older drivers may face risks due to their degraded driving performance, and female drivers may have a negative experience on automated driving.