WCRT Analysis of CAN Messages in Gateway-Integrated In-Vehicle Networks (original) (raw)
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Worst Case Response Time Analysis for Messages in Controller Area Network with Gateway
IEICE Transactions on Information and Systems, 2013
In modern automobiles, Controller Area Network (CAN) has been widely used in different sub systems that are connected by using gateway. While a gateway is necessary to integrate different electronic sub systems, it brings challenges for the analysis of Worst Case Response Time (WCRT) for CAN messages, which is critical from the safety point of view. In this paper, we first analyzed the challenges for WCRT analysis of messages in gateway-interconnected CANs. Then, based on the existing WCRT analysis method proposed for one single CAN, a new WCRT analysis method that uses two new definitions to analyze the interfering delay of sporadically arriving gateway messages is proposed for non-gateway messages. Furthermore, a division approach, where the end-to-end WCRT analysis of gateway messages is transformed into the similar situation with that of non-gateway messages, is adopted for gateway messages. Finally, the proposed method is extended to include CANs with different bandwidths. The proposed method is proved to be safe, and experimental results demonstrated its effectiveness by comparing it with a full space searching based simulator and applying it to a real message set.
Design and Implementation of Worst CaseResponse Time Analysis for CAN Bus
International Journal of Innovative Research in Computer and Communication Engineering, 2014
Controller Area Network (CAN) is widely used highly in automotive implementations; with in surplus of 500 million CAN sanctioned microcontrollers manufactured per year. In the year of 1994 schedulability analysis was developed for CAN(Controller Area Network), showing how worst-case response times(wcrt) of CAN messages could be deliberate and prove assurance provided that message response time would never pass their deadline. This main fact-finding has been exhibit schedulability response time in case of worst -case response time analysis. These tools have been used by a large number of major manufactures for automotive in the design of in-vehicle lattice for a wide range of cars and heavy vehicle millions of which have been manufactured over the last 6 years. In this paper we work on execution of data by using less clock cycles, which uses less response time to execute data to transmission. Through this paper we showed that the original schedulability analysis given for CAN (Contro...
Controller Area Network (CAN): Response time analysis with offsets
IEEE International Workshop on Factory Communication Systems - Proceedings, WFCS, 2012
Desynchronizing streams of frames through the means of offsets has today become common practice in automotive CAN networks. This is because this traffic shaping strategy is very beneficial in terms of reducing response times especially at high load levels. However, to the best of our knowledge, there is no result available in the literature that allows the response times of frames with offsets to be calculated for CAN. In this paper, we address this shortcoming of existing CAN schedulability analysis, and propose an extendible framework built upon the transaction model to derive worst-case response times (WCRT) on CAN. As will be shown in the experiments performed on realistic automotive networks, explicitly integrating offsets in the analysis permits a much tighter WCRT evaluation than with the classical synchronous analysis, which ultimately enables the designer to reduce resource overprovisioning.
STUDY OF RESPONSE TIME ANALYSIS FOR CAN BUS
The Controller Area Network (CAN) (1990) is one of the most usable bus networks in automobile industries as well as in many other industries for CAN standardization (1993). The basic concept of this review paper is to analyze response time for data transferring messages in CAN bus network for WCRT analysis till today scenario (2013).This paper includes the worst-case response time analysis which is determinable and probable response time analysis which is stochastic and this method will guarantees provided that the response time of messages would not exceeds their deadlines. This is because of the data traffic shaping strategy is very beneficial in terms of reducing response times especially at high data load levels. This is well designed bus network for transferring short real time messages.
Worst-case response-time analysis for mixed messages with offsets in Controller Area Network
Proceedings of 2012 IEEE 17th International Conference on Emerging Technologies & Factory Automation (ETFA 2012), 2012
The existing response-time analysis for Controller Area Network (CAN) does not support mixed messages that are scheduled with offsets. Mixed messages are implemented by several high-level protocols for CAN that are used in the automotive industry. We extend the existing offset-based analysis which is applicable to any high-level protocol for CAN that uses periodic, sporadic and mixed transmission of messages. Moreover, we implement the extended analysis as a standalone simulator that will be integrated as a plug-in with the existing industrial tool suite (Rubus-ICE). The experiments, that we performed, indicate that it is possible to achieve up to 4.48% improvement in schedulability when mixed messages are scheduled with offsets.
Implementation and Response Time Analysis of Messages in Wireless Controller Area Network
Indian Journal of Science and Technology, 2015
The Controller Area Network (CAN) is a vehicle bus standard for over two decades. In recent times CAN finds application in industrial automation as well, CAN is mostly employed for safety critical applications where low response time is essential. With the advent of wireless technology, there is a possibility for CAN messages to be exchanged wirelessly; there are several applications where wireless exchange of CAN messages is preferred. The Wireless Controller Area Network (WCAN) is a new approach of using CAN message-based protocol in wireless network. Message with higher priority gets transmitted first into the medium. This work investigates the possibilities to wirelessly communicate Controller Area Network (CAN) messages using the radio protocol IEEE 802.15.4, which is a very quick protocol and so the delays and jitter can be ignored in a small network. This work involves the implementation of Wireless Controller Area Network (WCAN) on FlexDevel board manufactured by Eberspascher. The idea is modelled and is shown to be a very smart way of sending CAN-data without using wires. SAE benchmark for Class C automobiles for safety critical control applications is used to validate the results.
MPS-CAN analyzer: Integrated implementation of response-time analyses for Controller Area Network
Journal of Systems Architecture, 2014
We present a new response-time analyzer for Controller Area Network (CAN) that integrates and implements a number of response-time analyses which address various transmission modes and practical limitations in the CAN controllers. The existing tools for the response-time analysis of CAN support only periodic and sporadic messages. They do not analyze mixed messages which are partly periodic and partly sporadic. These messages are implemented by several higher-level protocols based on CAN that are used in the automotive industry. The new analyzer supports periodic, sporadic as well as mixed messages. It can analyze the systems where periodic and mixed messages are scheduled with offsets. It also supports the analysis of all types of messages while taking into account several queueing policies and buffer limitations in the CAN controllers such as abortable or non-abortable transmit buffers. Moreover, the tool supports the analysis of mixed, periodic and sporadic messages in the heterogeneous systems where Electronic Control Units (ECUs) implement different types of queueing policies and have different types of buffer limitations in the CAN controllers. We conduct a case study of a heterogeneous application from the automotive domain to show the usability of the tool. Moreover, we perform a detailed evaluation of the implemented analyses.
Message response time analysis for ideal controller area network (CAN) refuted
2006
This paper revisits basic message response time analysis of controller area network (CAN). We show that existing message response time analysis, as presented in , is optimistic. Assuming discrete scheduling, the problem can be resolved by applying worst-case response time analysis for fixed-priority non-preemptive scheduling (FPNS) as described in [4].
The Controller Area Network (CAN) is a widely used real-time network in automotive domain. We identify that the existing response-time analysis for messages in CAN with some of the connected nodes implementing priority queues while others implementing FIFO queues does not support the analysis of mixed messages. The existing analysis assumes that a message is queued for transmission either periodically or sporadically. However, a message can also be queued both periodically and sporadically using a mixed transmission mode implemented by several high-level protocols for CAN used in the industry today. We extend the existing analysis which is generally applicable to any high-level protocol for CAN (with priorityand FIFO-queued nodes) that uses periodic, sporadic, and mixed transmission of messages.
Proceedings of 2012 IEEE 17th International Conference on Emerging Technologies & Factory Automation (ETFA 2012), 2012
The existing response-time analysis for messages in Controller Area Network (CAN) with controllers implementing non-abortable transmit buffers does not support mixed messages that are implemented by several high-level protocols used in the automotive industry. We present the work in progress on the extension of the existing analysis for mixed messages. The extended analysis will be applicable to any high-level protocol for CAN that uses periodic, sporadic and mixed transmission modes and implements non-abortable transmit buffers in CAN controllers.