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High-Reliability Physical Layer for In-Vehicle High-Speed Local Area Network
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Abstract
Recently, because of the requirements of performance and safety, it has become the concern to adopt intercommunication functions for the coordinated real-time control of the power train, brakes, suspension, and so on. For the transmission of these real-time control signals, a type of controller area network (CAN) for CSMA/CD with a non-destructive arbitration (NDA) protocol has been proposed.
In such protocols it is considered essential to have a physical layer having a high degree of reliability, but at high speeds conventional physical layers have not yet been achieved the nine requirements of fault tolerance that are included in ISO recommendations.
To overcome this difficulty a physical layer has recently been built that provides these fault tolerance requirements at a transmission speed of 1 Mbps. This paper reports on its configuration, and on the results of evaluation.
This physical layer utilizes shielded twisted pair wires as the transmission medium, effecting balanced-mode transmission at normal times and unbalanced-mode transmission during the occurrence of faults, thereby achieving the nine fault tolerance requirements.
Evaluation under in-vehicle environments has confirmed that this physical layer provides high levels of performance and reliability.
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Citation
Tanaka, M., Hashimoto, K., Himino, Y., and Suzuki, A., "High-Reliability Physical Layer for In-Vehicle High-Speed Local Area Network," SAE Technical Paper 910464, 1991, https://doi.org/10.4271/910464.Also In
References
- Takeda K. et al. “Electronic Technology for EUNOS COSMO” Mazda Technical Review August 1990
- Inoue T. et al. “Protocol for Automotive Local Area Network (PALNET) -A Newly Developed In- Vehicle Communication System Based on SAE J1850” SAE paper 890535
- “Brief minutes on the meeting of the High Speed Task Force at January 18 and 19, 1990 in Toulouse”
- Intel's 82526 Serial Communications Controller Architectual Overview
- Peter Cornelius
- “CAN Draft Standard - Electric Specification High Speed - April 1990”
- “INTERIM REPORT OF THE EVALUATION OF AUTOMOTIVE DISTRIBUTED CONTROL MULTIPLEX SYSTEM” JSAE Serial Data Communication Subcommittee Working Group October 18-19 1990