The Intelligent FlexRay Safety Monitoring Platform Based on the Automotive Hybrid Topology Network

Sheu, Yung-Hoh; Ku, Chun-Ming

doi:10.1109/iih-msp.2012.76

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…A number of new TTPs have arisen in the market, which includes: 1) FlexRay was firstly proposed by Daimler Chrysler and BMW. It can achieve better performance than CAN and TTP at higher cost [10,11];…”

Section: Related Workmentioning

confidence: 99%

Formal Verification of Fault-Tolerant and Recovery Mechanisms for Safe Node Sequence Protocol

Zhou

Min

et al. 2014

2014 IEEE 28th International Conference on Advanced Information Networking and Applications

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Fault-tolerance has huge impact on embedded safety-critical systems. As technology that assists to the development of such improvement, Safe Node Sequence Protocol (SNSP) is designed to make part of such impact. In this paper, we present a mechanism for fault-tolerance and recovery based on the Safe Node Sequence Protocol (SNSP) to strengthen the system robustness, from which the correctness of a fault-tolerant prototype system is analyzed and verified. In order to verify the correctness of more than thirty failure modes, we have partitioned the complete protocol state machine into several subsystems, followed to the injection of corresponding fault classes into dedicated independent models. Experiments demonstrate that this method effectively reduces the size of overall state space, and verification results indicate that the protocol is able to recover from the fault model in a fault-tolerant system and continue to operate as errors occur.

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Section: Related Workmentioning

confidence: 99%

Formal Verification of Fault-Tolerant and Recovery Mechanisms for Safe Node Sequence Protocol

Zhou

Min

et al. 2014

2014 IEEE 28th International Conference on Advanced Information Networking and Applications

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“…There can be more than one gateway ECU to decrease the impact of the single point of failure problem when the gateway ECU is malfunctioning. This issue is tackled in [19]. However, it is assumed for the sake of simplicity that there is just one gateway ECU in the N GW set in the rest of the paper.…”

Section: Problem Statementmentioning

confidence: 99%

Using Two Independent Channels With Gateway for FlexRay Static Segment Scheduling

Dvořák¹,

Hanzálek²

2016

IEEE Trans. Ind. Inf.

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The FlexRay bus is a communication standard used in the automotive industry. It offers a deterministic message transmission in the static segment following a time-triggered schedule. Even if its bandwidth is ten times higher than the bandwidth of CAN, its throughput limits are going to be reached in high-class car models soon. A solution that could postpone this problem is to use an efficient scheduling algorithm that exploits both channels of the FlexRay. The significant and often neglected feature that can theoretically double the bandwidth is the possibility to use two independent communication channels that can intercommunicate through the gateway.In this paper, we propose a heuristic algorithm that decomposes the scheduling problem to the ECU-to-channel assignment subproblem which decides which channel the ECUs (Electronic Control Units) should be connected to and the channel scheduling subproblem which creates static segment communication schedules for both channels. The algorithm is able to create a schedule for cases where channels are configured in the independent mode as well as in the fault-tolerant mode or in cases where just part of the signals are fault-tolerant. Finally, the algorithm is evaluated on real data and synthesized data, and the relation between the portion of fault-tolerant signals and the number of allocated slots is presented.

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“…6 length of message "c" length of FlexRay cycle U   (1) such as the centroid, single linkage, complete linkage, and average linkage methods.…”

Section: ) Hierarchical Clustering Methodsmentioning

confidence: 99%

The Message Scheduling Methods of FlexRay Communication Network Based on the Clustering Methods

Sheu¹,

Liou²,

Wang³

2014

LNSE

Self Cite

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On a technical level, FlexRay currently has the most rapid communication speed among all interfaces. It is an indispensable network technology for realizing x-by-wire. Using FlexRay can reduce vehicle body weight and link all safety devices [6]. X-by-wire is a technology that uses electric actuators or motor electronics to control traditional mechanical handling and breaking functions [7], [8], and this technology includes drive-by-wire. X-by-wire can significantly increase vehicle performance and safety and permits the omission of mechanical components.Active safety systems contain computer antilock braking systems (ABSs), traction control systems (TCSs), and electronic stability programs (ESPs). In other words, the importance of active safety systems and the proportion of electronics in vehicles are gradually increasing.FlexRay has become an industry standard for vehicle networks. The topology of FlexRay communication networks also differs from that of earlier bus architecture in that FlexRay involves the additional concepts of active star and passive star [9]. FlexRay is also appropriate for critical and real-time x-by-wire control data transfers. By contrast, other communication protocols, such as CAN and LIN, are more appropriate for noncritical and non-real-time applications.FlexRay deploys most messages to static segments. The system can also deploy messages to dynamic segments to reduce network use during transmission [10]. In this study, the K-means clustering method and the hierarchical clustering method were used to cluster the messages to be transmitted and deploy them to static and dynamic segments, thereby reducing overall usage of the FlexRay communication network. II. SYSTEM PRINCIPLESIn this section, the clustering methods and the features of FlexRay are introduced. A. FlexRay Specification 2) Network topology of the FlexRay communication protocolThe FlexRay communication network can support a variety of network topology connections. Its transmission methods can be configured for single-or dual-channel transmissions. Fig. 2 shows the simplest FlexRay bus network connection. Node 1 and Node 4 connect Channels A and B, whereas Node 2 connects only Channel A and Node 3 connects only Channel B. In addition, FlexRay communication networks also include star topology connections. These are similar to bus connections in that they can support dual-channel connections. Multiple star connectors can be used to establish star configuration network topology. FlexRay connection methods have considerable flexibility.Bus-topology connections remain the primary communication network connections used in vehicles. In addition to being inexpensive, they are also easy to install. However, when the number of nodes within a network increases, relative transmission distance decreases. At this point, star connections can extend the network, combining with existing bus networks to form hybrid network topology connections. Users can then adjust network topology connections based on actual needs. 3) Frame format of the F...

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The Intelligent FlexRay Safety Monitoring Platform Based on the Automotive Hybrid Topology Network

Cited by 5 publications

References 3 publications

Formal Verification of Fault-Tolerant and Recovery Mechanisms for Safe Node Sequence Protocol

Formal Verification of Fault-Tolerant and Recovery Mechanisms for Safe Node Sequence Protocol

Using Two Independent Channels With Gateway for FlexRay Static Segment Scheduling

The Message Scheduling Methods of FlexRay Communication Network Based on the Clustering Methods

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