• 한국자동차공학회논문집
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• 제14권2호
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• pp.151-157
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• 2006

The passenger car drivers want in general to feel good driveability, but they sometimes feel uncomfortable by shock and jerk phenomena when they push or release acceleration pedal with clutch on state. In this paper, the shock and jerk characteristics are studied on the vehicles controlled by the throttle-by-wire system. Experiments and simulations were carried out on two vehicles which show different control characteristics. The engine torque control characteristics was analyzed by measuring cylinder pressure. Various specification factors of the vehicles and the torque control logic of the engines were simulated through experimental data basis. The result shows the spring effect of the trans-axle in the drive-train is one of the most important factors of the shock-jerk phenomena and the engine torque control method is also responsible for the reducing the shock-jerk amplitude. In this paper a new control logic of the engine torque is suggested for the better driveablility on the tip-in/out event.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회A
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• pp.1792-1797
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• 2007

This paper try to find root-cause of failure in a connector used in transmitting signals for throttle body control in automotives by analyzing possible failure causes and performing experiments to simulate the cable failure in field. The connector comprises fins, wires, and case moldings. The failure is due to degradation of initial clamping force required fixing fins and wires in the connector. Expansion and compression of the case molding material surrounding fins would cause the degradation. Investigations of strict initial claming force and control of thermal expansion property of the molding are required to prevent the failure.

• 한국항공우주학회지
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• 제46권6호
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• pp.487-495
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• 2018

환형 갭과 핀틀갭의 면적을 동시에 제어할 수 있는 가변 슬리브 인젝터의 분무특성을 실험적으로 분석하고, 넓은 추력범위에서 일정한 성능으로 제어할 수 있는 방안을 연구하였다. 슬리브의 개도에 관계없이 일정한 차압을 설정한 경우 설계유량을 만족하지 못하는 것을 확인하였다. 이를 개선하기 위해 개도에 따라 환형 갭과 핀틀 갭에서의 차압을 개도에 따라 다르게 적용하였다. 운용범위 내에서 설계 유량을 만족하였고, 선형적인 슬리브 면적으로 25%에서 100%까지 선형적으로 추력제어가 가능한 것을 확인하였다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 추계학술대회논문집B
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• pp.353-358
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• 2001

Turbo-charging or Super-charging has been used to boost engine power for Gasoline Engine and Diesel Engine came to the world at the beginning of $20^{th}$ century. So far Turbo-Charger has enjoyed a high reputation in the charging filed for its technical advantages such as no demand of operation power from engine and an excellent charging effect in the event of a static operation at mid- and high engine speed. A mechanically driven Super-Charger, however, is now emerging in order to meet demands of the age of speed such as high engine power for a quick change of the driving mode - high engine torque even at low engine speed. Since Super-Charger needs driving power from engine, it cannot improve its relatively higher fuel consumption against that of Turbo-Charger. This negative point is still an obstacle to the wide use of Super-Charger. Super-Charger using Screw-type compressor which has already had a considerable base in air compressor market will fulfill this purpose of improving fuel consumption by minimizing operation power owing to no charging at idling or partially loading driving. This study aims to develop power control concept to achieve this minimization of operation power.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.295-296
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• 2007

본 논문에서는 무인화 ATV 엔진 액츄에이터의 시스템 특수성을 고려한 PID 제어기의 설계를 통하여 종방향 구동을 담당하는 DC 모터의 위치제어 성능을 향상시켰다. DC 모터의 문턱 전압과 마찰력으로 인한 데드존(Dead zone)을 고려하였으며, DC 모터에 연결된 액츄에이터 와이어에 의한 복원력에 대한 영향을 최소화 시켰다. 또한 DC모터의 위치를 판별하는 엔코더의 분해능을 감안하여 제어기 설계에 반영하였고, 실험을 통하여 성능을 검증하였다.

• 한국자동차공학회논문집
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• 제6권3호
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• pp.45-53
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• 1998

Traction control systems(TCS) improve vehicle acceleration performance and stability, particularly on slippery roads through engine torque and/or brake torque control. This research mainly deals with the engine control algorithm based on adjustment of the engine throttle valve opening. Hardware-in-the-loop simulation(HWILS) is carried out where the actual hardware is used for the engine/automatic transmission and TCS controller, while various vehicle dynamics are simulated on real-time basis. Also, use of the dynamometer is made in order to implement the tractive force that a road applies to the tire. Although some restrictions are imposed mainly due to the capability of the synamometer, simplified HWILS results show that the slip control algorithm can improve the vehicle acceleration performance for low-friction roads.

• 한국산학기술학회논문지
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• 제15권3호
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• pp.1229-1235
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• 2014

LPG차량의 공기 흡입 시스템에서 먼지 입자의 대부분은 공기 청정기를 통해 제거되지만, 아주 작은 입자는 제거되지 않고 흡기계통에 축적되게 된다. 이 축적된 카본은 공회전 속도 제어와 센서신호 그리고 배출가스에 영향을 주게 된다. 또한 엔진 채터링 현상이나 자동변속기의 변속시점 불량등을 야기시킨다. 이 연구는 세척액을 사용하여 흡기계통을 세척하는 것에 관한 것이다. 워밍업된 챠량에서 흡입호스를 제거하고 세척액을 사용하여 가속시에 세척액을 흡입장치에 분사시켜 흡기계통을 세척하는 것이다. 세척액을 사용하여 스로틀 바디, ISC, 서지탱크, 흡입매니폴드, 흡기밸브, 연소실까지 세척함으로서 다음과 같은 실험결과를 얻을 수 있다. 스로틀 밸브가 정확하게 작동되어 TPS의 센서 신호 전압이 개선되었으며, 차량이 정지하는 경우 ISC 시스템은 공회전 속도 제어를 원활하게 작동하였다. 또한 일산화탄소는 약 0.15 %, 탄화수소는 약 20~100PPM으로 각각 감소되어 배기가스가 현저하게 개선되었다.

• 한국자동차공학회논문집
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• 제12권2호
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• pp.139-147
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• 2004

The purpose of engine control TCS is to regulate engine torque to keep driven wheel slip in a desired range. In this paper, engine control TCS using sliding mode control law based on engine model and estimated load torque is proposed. This system includes a two-level controller. Slip controller calculates desired wheel torque, and engine torque controller determines throttle angle for engine torque corresponding to desired wheel torque. Another issue is to measure load torque for model based controller design. Luenberger observer with state variables of load torque and engine speed solves this problem as estimating load torque. The performance of controller and observer is certificated by simulation using 8-degree vehicle model, Pacejka tire model, and 2-state engine model. The simulation results in various maneuvers during slippery and split road conditions showed that acceleration performance and ability of the vehicle with TCS is improved. Also, the load torque observer could estimate real load torque very well, so its performance was proved.

• 한국자동차공학회논문집
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• 제16권5호
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• pp.92-99
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• 2008

This paper describes an signal processing method for the hall sensorless position control of ETC control system using a BLDC motor. The proposed ETC control system, which is mainly consisted of a BLDC motor, a throttle plate, a return spring and reduction gear, has a position sensor with an analog voltage output on the throttle valve instead of BLDC motor for detecting rotor position of motor. So the additional commutation information is necessarily needed to control the mentioned ETC module. In order to estimate and determine the commutation state, it is proposed to properly manipulate the resolution of A/D converter considering the mechanical parameter, that is, the number of motor slot and the ratio of reduction gear. Through this method, the estimation of commutation state for operating the system is possible and the discrete signal for commutation is stably obtained. The validity of the method is examined through the experimental results.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 D
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• pp.1826-1827
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• 2006

본 논문에서는 운행 중인 자동차에서 스로틀밸브의 각도와 자동차의 속도를 추출하고 시스템 식별 알고리즘을 이용해 비교적 정확한 자동차의 수학적 모델링 식 즉, 전달함수를 구하고, 식별 알고리즘에 의해 구해진 고차 형태의 전달함수를 2차식과 시간지연 항으로 간략화 시켜 자동차가 순항 운행할 수 있는 제어기를 설계한다.