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논문 기본 정보

자료유형
학술대회자료
저자정보
원우석 (Mando Corporation) 김대성 (Mando Corporation) 표종현 (Mando Corporation) 이진환 (Mando Corporation)
저널정보
한국자동차공학회 한국자동차공학회 추계학술대회 및 전시회 2022년 한국자동차공학회 추계학술대회 및 전시회
발행연도
2022.11
수록면
718 - 725 (8page)

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초록· 키워드

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In this paper, methodologies of safety mechanism were proposed for steer-by-wire system to redeem a system resiliency against safety hazard. The composition and structure of steering systems have been compared to discriminate the challenge of how to keep the system in a safe state when a failure occurs. Past research or present steer-by-wire system in the market has a physical clutch between the steering wheel and rack gear, however, this measure incapacitates intrinsic advantages of a steer-by-wire system that carmakers have a strategy of scalability. Redundant electric/electronic apparatus and an operation methodology for the apparatus were suggested to keep or migrate the system to the safe state. Each of the actuators -steering feedback actuator and road wheel actuator- consist of the sensor, ECU(Electronic control unit), motor and all those E/E devices were fully duplicated so that the system utilizes the primary device only in normal case but the backup device can replaced the primary device once a critical failure is occurred in primary device. This can be realized by implementing the truth-table which determines device that needs to be activated at each execution time. Also, the tandem operation concept has been proposed to make a whole steering system in stable and consistent operation. This concept was actualized by overriding own failure flag internally when the ECU detects a failure of the counter actuator through the communication channel. The proposed concept and design have been implemented by application software which has classic AutoSAR platform and then flashed into the TC234 microprocessor on physical SFA, RWA gears to verify if the functionality of the safety mechanism is working according to the implementation. Total six possible failure cases have been sorted out by case study and each expected behaviors of the system with the safety mechanism were analyzed. Finally, we were able to verify the effectiveness of the proposed safety mechanism by comparing actual fault handling time interval and required fault tolerance time interval.

목차

Abstract
1. 서론
2. Steer-by-Wire System
3. 이중화 SbW 시스템의 설계
4. 안전 메커니즘 검증
4. 결론
References

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