| 1. |
- Aysan, Hüseyin, et al.
(författare)
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Probabilistic schedulability guarantees for dependable real-time systems under error bursts
- 2011
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Ingår i: Proc. 10th IEEE Int. Conf. on Trust, Security and Privacy in Computing and Communications, TrustCom 2011, 8th IEEE Int. Conf. on Embedded Software and Systems, ICESS 2011, 6th Int. Conf. on FCST 2011. - 9780769546001 ; , s. 1154-1163
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Konferensbidrag (refereegranskat)abstract
- The fundamental requirement for the design of effective and efficient fault-tolerance mechanisms in dependable real-time systems is a realistic and applicable model of potential faults, their manifestations and consequences. Fault and error models also need to be evolved based on the characteristics of the operational environments or even based on technological advances. In this paper we propose a probabilistic burst error model in lieu of the commonly used simplistic fault assumptions in the context of processor scheduling. We present a novel schedulability analysis that accounts for the worst case interference caused by error bursts on the response times of tasks scheduled under the fixed priority scheduling (FPS) policy. Further, we describe a methodology for the calculation of probabilistic schedulability guarantees as a weighted sum of the conditional probabilities of schedulability under specified error burst characteristics. Finally, we identify potential sources of pessimism in the worst case response time calculations and discuss potential means for circumventing these issues.
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| 2. |
- Shah, M. B. N., et al.
(författare)
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A new error handling algorithm for controller area network in networked control system
- 2013
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Ingår i: Computers in industry (Print). - : Elsevier BV. - 0166-3615 .- 1872-6194. ; 64:8, s. 984-997
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Tidskriftsartikel (refereegranskat)abstract
- An effective error handling mechanism plays an important role to ensure the reliability and robustness of the application of controller area network (CAN) in controlling dynamic systems. This paper addresses a new online error handling approach or named per-sample-error-counting (PSeC) technique that tends to replace native error handling protocol in controller area network (CAN). The mechanism is designed to manage transmission errors of both sensor and control data in networked control system (NCS) used in controlling dynamic system such that the stability of the feedback system is preserved. A new parameter denoted as maximum allowable number of error burst (MAEB) is introduced in which MAEB is selected based on available bandwidth of the CAN network. MAEB serves as the maximum number of attempt of re-transmission of erroneous data per sample which allows the maximum transmission period to be known and guaranteed for time-critical control system. The efficacy of the proposed method is verified by applying the algorithm on the fourth order inverted pendulum system simulated on Matlab/Truetime simulator and the performance is benchmarked with the existing CAN error management protocol. The simulation run under various systems conditions demonstrate that the proposed method results in superior system performance in handling data transmission error as well as meeting control system requirement. © 2013 Elsevier B.V.
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| 3. |
- Shah, M. B. N., et al.
(författare)
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Error Handling Algorithm and Probabilistic Analysis Under Fault for CAN-Based Steer-by-Wire System
- 2016
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Ingår i: IEEE Transactions on Industrial Informatics. - 1551-3203 .- 1941-0050. ; 12:3, s. 1017-1034
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Tidskriftsartikel (refereegranskat)abstract
- This paper proposes an efficient way to handle fault in controller area network (CAN)-based networked control system (NCS). A fault in a bus line of CAN will induce a data error which will result in data dropout or time delay, and subsequently may lead to performance degradation or system instability. A strategy to handle fault occurrence in CAN bus is proposed to properly analyze the effect of the fault to CAN-based NCS performance. The fault occurrences are modeled based on fault interarrival time, fault bursts' duration, and Poisson law. Using fault and messages' attributes, response time analysis (RTA) is performed and the probability of control message missing its deadline is calculated. Utilizing the new error handling algorithm to replace the native error handling of CAN, the probability of a control message missing its deadline can be translated into the probability of data dropout for control message. This methodology is evaluated using steer-by-wire system of vehicle to analyze the effect of fault occurrences in CAN. It is found that the proposed error handling mechanism has resulted in better NCS performance and the range of data dropout probability for control message also could be obtained, which serves as crucial input for NCS controller design.
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