Response-Time Modeling of Controller Area Network (CAN)

  • Authors:
  • Manoj Kumar;Ajit Kumar Verma;A. Srividya

  • Affiliations:
  • Control Instrumentation Division BARC, Trombay, Mumbai, 400085;Reliability Engineering, IIT Bombay, Powai, Mumbai, 400076;Reliability Engineering, IIT Bombay, Powai, Mumbai, 400076

  • Venue:
  • ICDCN '09 Proceedings of the 10th International Conference on Distributed Computing and Networking
  • Year:
  • 2009

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Abstract

A probabilistic approach to determine response-time distribution for messages in Controller Area Network (CAN) is presented here. CAN is a field bus level communication network for exchanging short real-time messages. CAN is mostly used to carry periodic messages for control and automation systems. Traditional response-time analysis of CAN messages only gives worst-case response-times. This introduces pessimism in analysis, resulting in over designing and under utilization of resources. Response-time distribution is a probabilistic function. Response-time distribution provides a complete characterization of CAN message response-time. It can provide probability of meeting/missing any specified response-time limit. This probability is useful for system reliability and performance modeling. In this paper response-time model of CAN messages is discussed. Technique to derive probabilistic parameters of response-time model, for periodic CAN messages with deterministic transmission times is given. The method has been applied to a standard data set, results are compared with that of worst-case analysis and reasons for deviations are discussed.