시스템 고장시 안정성이 보장되는 자동차용 동력 지원 스티어링 시스템에 관한 연구

소상균 한밭대학교 생산융합기술연구소 2004 생산융합기술연구소 논문집 Vol.4 No.1

지상차량의 롤모드 상에서 댐핑효과 향상을 위한 스티어링 제어에 관한 연구

소상균 한밭대학교 생산기반기술연구소 2001 생산기반기술연구소 논문집 Vol.1 No.1

For the high center of gravity vehicles the roll stiffness of their suspensions is arranged to be very high because such vehicles are in some danger of tipping over in cornering. In some cases, the effective roll stiffness is determined significantly by the compliance of the tires because of the very stiff anti-roll members incorporated in the suspension. Therefore, wind gusts and roadway unevenness may cause large swaying oscillations because the shock absorbers cannot provide effective damping of the roll mode. Here, a control scheme to augment the damping of the roll mode is proposed. The use of feedback signals related to roll motion to steer the front or rear wheels in such a way as to provide damping of the roll motion will be studied. The scheme is effective from moderate speeds to high speeds and stabilizes the roll mode without introducing disturbance moments from roadway unevenness as shock absorbers do.

퍼지로직을 이용한 자동차 차체진동 개선에 관한 연구

소상균 한밭대학교 생산기반기술연구소 2002 생산기반기술연구소 논문집 Vol.2 No.1

Automotive suspension system is a mechanism for isolation of the vibration coming from the road inputs. However, the passive suspension system has limitation to improve the vibration isolation both low frequencies and high frequencies. To solve the limitation the electronically controlled suspension systems which may improve ride and handling performance have been developed. Those are the active and semiactive suspension systems. In this paper in order to compare the ride isolation for the two different suspension systems the frequency responses are driven. As a means of compensation of the active suspension system the semiactive suspension system which is based on the sky-hook theory is considered. At this time to simplified the analysis one degree of freedom vehicle model is used. To design the efficient control algorithm for the semiactive suspension system the knowledge based fuzzy logic is applied. Finally, to confirm the improvement of performance the computer simulation is carried out.

폭이 좁은 지상 차량의 승차감 향상을 위한 서로 다른 두 개의 능동형 기울임 제어 시스템들의 결합에 관한 연구

소상균 한밭대학교 생산융합기술연구소 2001 생산융합기술연구소 논문집 Vol.1 No.1

2자유도 서스펜션 시스템의 주파수 응답특성 분석

소상균 한밭대학교 생산기반기술연구소 2002 생산기반기술연구소 논문집 Vol.2 No.1

Automotive suspension system is mechanism for isolation of the vibration coming from the road inputs. However, the passive suspension system has limitation to improve the vibration isolation both low frequencies and high frequencies. To improve the performance of the passive system the active and semiactive suspension systems have been developed. In this paper, to show the effect of performance improvement for the active suspension system compared to the passive one the technique for frequency response analysis is introduced theoretically. At this time fairly complicated two degrees of freedom vehicle model is used and both sprung mass response and wheel response are compared. Finally, to confirm the improvement of performance of the active suspension system the computer simulations is carried out.

시스템 고장시 안전성이 보장되는 자동차용 동력 지원 스티어링 시스템에 관한 연구

소상균 한밭대학교 생산융합기술연구소 2004 생산기반기술연구소 논문집 Vol.4 No.1

When human power is not sufficient to turn the actuating device in the vehicle steering control system the power assist systems are used. There are a variety of means for achieving a power assist system, for example, a fly-by-wire or drive-by-wire, etc. Such power assist systems have a basic disadvantage that results in an uncontrollable system under failures in the sensors, actuators, and signal processor. Here, two complementary power assist systems in which a mechanical back-up function can be provided for fail safe operation are suggested. The fact that two systems have distinct capabilities when used for power steering or vehicle stabilization and handling enhancement and are safe for complementary actuator failures is discussed. Furthermore, the two systems have a merit which affect the back relations related to the feel that a human operator would sense in quite different ways.

파워스티어링 시스템의 개념적인 이해 및 응용에 관한 연구

소상균 한밭대학교 생산기반기술연구소 2004 생산기반기술연구소 논문집 Vol.5 No.1

The steering system gives driver hard burden to steer the steering handle. The device which is designed to lessen this type of burden is the power steering system. In addition to signal controller power assist systems as used for example, in fly-by-wire aircraft, there are two complementary power boost systems in which a mechanical back-up function can be provided for fail-safe operation. The systems can be described as force boost and velocity boost systems. The two systems have distinct capabilities when used for power steering or vehicle stabilization and handling enhancement, for example, and are fail safe for complementary actuator failures. Futhermore, the systems affect the back relations related to the 'feel' that a human operator would sense in quite different ways. Most of power steering systems are related to the force boost system. Now, the two types of power steering systems are analyzed and compared theoretically to help the conceptual understanding and to verify the above mentioned concepts. And then, an idea on the application for the velocity boost system which is less used relatively is suggested.

농업용 트랙터의 전자제어식 Plow와 Rotary 유압장치 개발에 관한 연구

소상균,손대원 한밭대학교 2011 한밭대학교 논문집 Vol.27 No.-

The objective of this study is to design the implement control system for agricultural tractors to evaluate the performance of the possibility of application of the designed control system to agricultural tractors. The field experiments in an actual field were conducted to evaluate the adaptability of the control system to the field under the condition of three kinds of ground speeds. The results of the field experiments for basic and additional control mode showed that the control system followed well to the desired value, in spite of the variation in the ground speeds and desired values. 경심을 일정하게 유지하는 것은 작물의 균일한 생장을 위해서뿐만 아니라 후속작업의 능률 및 작업정도의 향상을 위해 괼수불가결한 요인 가운데 하나 이다. 한국의 경우는 미국 또는 일본 등과 달리 Plow와 Rotary·작업기에 의한 경운작업이 거의 같은 비율로 행해지고 있으며, 이를 작업기용 제어시스템 은 제어시스템의 Actuator 로서 사용되는 유압회로를 작동하게 된다.

자동차용 현가장치에 퍼지로직의 응용

소상균,곽성배 한밭대학교 생산기반기술연구소 2003 생산기반기술연구소 논문집 Vol.3 No.1

The main goal of the automotive suspension is to isolate the vibration coming from the roadway unevenness. There are three types of the suspension systems which are the passive, the active, and the semi-active system. The passive system has the limitation of the performance and the active system requires high cost of production. Therefore, the semi-active system is proper to apply to the passenger cars. In this paper, to improve the ride isolation property the advanced research about the better semi-active suspension system is carried out. First, after the vehicle dynamic model is constructed the continuous controlled damper is combined to the vehicle model. And then, the control algorithm to control the vehicle dynamic motion effectively is designed. Finally, the hardware-in-the-loop-simulator is equipped and tested to confirm the system performance.

무게중심이 높은 차량의 롤 강성계수 증대를 위한 스티어링 제어기법의 응용에 관한 연구

소상균,변기식 한국융합신호처리학회 2003 융합신호처리학회 논문지 (JISPS) Vol.4 No.2

무게중심이 높은 차량은 코너링 시에 전복되는 위험을 방지하기 위해 서스펜션 롤 강성이 매우 커야 한다. 어떤 경우에는 효과적인 롤 강성이 주로 타이어 컴플라이언스에 의해 결정되는데, 그러한 경우에는 히브(heave) 진동의 감쇠를 위해 사용되는 쇽업쇼바는 롤 진동을 억제하는 데에는 별다른 효과가 없다. 따라서, 차량의 측면에 돌풍이 불거나 차량이 불규칙한 도로면을 통과하게 될 경우 차량이 좌우로 심하게 흔들리게 된다. 본 연구에서는 무게중심이 높은 차량의 안정성을 향상시키기 위해서 롤 모드 상에서 댐핑을 증가시킬 수 있는 제어기법이 제안되었다. 롤 운동의 댐핑을 제공하기 위해 요구되는 궤환신호로 앞 또는 뒤 또는 앞 뒤 바퀴의 조향각이 사용되었다. 그 이유는 그 신호들이 롤 운동과 매우 밀접하게 관련이 있기 때문이다. 제안된 제어기법은 중고속에서 매우 효과적이고 쇽업쇼바와는 달리 외적 입력에 대해 외란 모멘트를 생성하지 않고 롤 모드를 안정화시키는 것이 가능하다. 이론적으로 제시된 제어기법에 대한 타당성을 컴퓨터 시뮬레이션으로 확인하였다. For the high center of gravity vehicles the roll stiffness of their suspensions is arranged to be very high because such vehicles are in some danger of tipping over in cornering. In some cases, the effective roll stiffness is determined significantly by the compliance of the tires because of the very stiff anti-roll members incorporated in the suspension. In such cases, it is clear that the shock absorbers which may be effective in damping heave oscillations have little effect on roll oscillations. Therefore, wind gusts and roadway unevenness may cause large swaying oscillations. In this paper, to improve the stability for the high center of gravity vehicles a control scheme to augment the damping of the roll mode is proposed. As the feedback signals needed to provide damping of the roll motion, the front or rear steer angles or both are chosen because they are very related to roll motion. The scheme is effective from moderate to high speeds and stabilizes the roll mode without introducing disturbance moments from roadway unevenness as shock absorbers do. The validity on the proposed method is verified through the computer simulation.