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Development of a Class C Multiplex Control IC
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English
Abstract
With the increasing use of electronic control systems to improve vehicle dynamics, there is an ever growing need to transfer control information among electronic control units(ECUs). To meet this need, a protocol was proposed for high-speed multiplex in the previous SAE paper 910463. Based on the paper, a prototype IC for high-speed multiplexing control was developed.
First, a further analysis was made of the information which is transferred among ECUs. As a result, it was found that the information has certain distinctive characteristics. These characteristics are so distinctive that it may be relevant to devise a new protocol for communication.
Based on the analysis, a new form of token passing method was implemented. By using this method, it is easy to calculate transmission latency time. So this method is suitable for a real time control application like vehicle dynamics control.
Another key point of high-speed data communication is the extent of load imposed upon the host microprocessor. Although a serial communication interface was used, by using methods of ID filtering, ID sorting, and DMA, the load on the microprocessor was made very light.
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Authors
Citation
Azuma, M., Takagi, Y., Chujo, N., and Kawahashi, A., "Development of a Class C Multiplex Control IC," SAE Technical Paper 930003, 1993, https://doi.org/10.4271/930003.Also In
Multiplex Technology Applications in Vehicle Electrical Systems
Number: SP-0954; Published: 1993-03-01
Number: SP-0954; Published: 1993-03-01
References
- Phail F. H. Arnett D. J. “In-Vehicle Networking -- Serial Communication Requirements and Directions” SAE paper 860390
- Nakamura S. Isobe T. Hirabayashi Y. “The High-Speed In-Vehicle Network of Integrated Control System for Vehicle Dynamics” SAE paper 910463
- SAE Vehicle Network for Multiplexing and Data Communications Standard Committee “Controller Area Network (CAN), an In-Vehicle Serial Communication Protocol” SAE J1583 March 1990
- SAE Vehicle Network for Multiplexing and Data Communications Standard Committee “Class B Data Communication Network Interface” SAE J1850 July 1990