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An Automotive Specification of a Time Triggered CAN Implementation: Doubling CAN's Usable Data Throughput
Technical Paper
2005-01-1539
ISSN: 0148-7191, e-ISSN: 2688-3627
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Abstract
The Controller Area Network (CAN) has seen enormous success in automotive body and powertrain control systems, and in industrial automation systems using higher layer protocols such as DeviceNet and CANopen. Now, the CAN standard ISO11898 are being extended to Time Triggered CAN (TTCAN) to address the safety critical needs of first generation drive-by-wire systems. However, their successful development depends upon the availability of silicon and software support, and appropriate development & analysis tools. This paper outlines the current status of TTCAN technology and describes the implementation of Level 1 TTCAN on the Atmel 89c51cc01/cc02/cc03/cc04 microcontrollers. The descriptions contained show how to implement for different bus speeds, along with suggestion for a user to tailor the drivers for their own application. Level 2 TTCAN is also described for comparison purposes.
Whilst the TTCAN implementation described in this paper is limited to the maximum CAN bit rate of 1Mbit/s, TTCAN can be used to effectively double the bandwidth of a CAN system to the region of 60 to 70% bus loading at 500 Kbit/s and 1Mbit/s. This is approximately twice that of traditional automotive CAN systems. For example, a typical automotive power train control system based on CAN typically runs at maximum of about 35% loading at 500 KBaud to avoid data bus latencies.
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Quigley, C., Pope, B., Finney, J., and McLaughlin, R., "An Automotive Specification of a Time Triggered CAN Implementation: Doubling CAN's Usable Data Throughput," SAE Technical Paper 2005-01-1539, 2005, https://doi.org/10.4271/2005-01-1539.Data Sets - Support Documents
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Also In
Automotive Electronics on CD-ROM from the SAE 2005 World Congress
Number: SP-1980CD; Published: 2005-04-11
Number: SP-1980CD; Published: 2005-04-11
SAE 2005 Transactions Journal of Passenger Cars: Electronic and Electrical Systems
Number: V114-7; Published: 2006-02-01
Number: V114-7; Published: 2006-02-01
References
- Fuhrer T et al 2000 “Time Triggered Communication on CAN (Time Triggered CAN-TTCAN)” Proceedings of the 7 th International CAN Conference Amsterdam 24th 25th October 2000
- Hartwich et al 2000 “CAN Network with Time Triggered Communication” Proceedings of the 7 th International CAN Conference Amsterdam 24th 25th October 2000
- McLaughlin & Quigley 2004 “Analysis and Diagnostics of Time Triggered CAN (TTCAN) Systems” SAE Congress paper 2004-01-0201