Bus system for data transfer

Details Bus system for data transfer Bus system for data transfer

1999-04-16

2001-03-27

Cuchlinski, Jr., William A. (Department: 3661)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Vehicle subsystem or accessory control

C701S048000, C340S870030, C340S870030, C340S870030, C340S436000, C340S669000, C370S509000, C370S514000, C315S077000, C315S079000, C315S080000

Reexamination Certificate

active

06208924

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a bus system for the transmission of messages.
BACKGROUND INFORMATION
German Patent No. 35 06 118 describes a bus system for the transmission of messages which is also referred to as a CAN bus. With the CAN bus, high-priority messages are transmitted preferentially. For this, each message is preceded by a so-called “header,” which decides which message is to be transmitted next when the bus is free. It is not possible, however, to interrupt a message in progress. Furthermore, all messages have the same amplitude between high and low bit states.
In “Bus Contention and Overload Detecting Transmitter,” IBM Technical Disclosure Bulletin, Vol. 34, No. 8, Jan. 1, 1992, pp. 10-13, a bus system is described in which messages can be aborted by overwriting bits. Higher-priority messages can then gain access to the bus in a new arbitration subsequent thereto.
SUMMARY OF THE INVENTION
A bus system according to the present invention has an advantage that messages with differing priorities can be clearly separated from one another. Since the high-priority messages can overwrite the low-priority messages at any time, high-priority messages can be transmitted at any time, i.e. even while transmission of a low-priority message is in progress. It is furthermore possible to use, for high-priority messages, completely different processing rules, i.e. a completely different transmission protocol, from those for low-priority messages.
Using a variation in bit length, high-priority messages can be transmitted substantially faster than low-priority messages. In addition, the electromagnetic interference resulting from bit sequences on the bus lines can thereby be minimized in the case of low-priority messages. The transmission of messages can be accomplished on only two bus lines, through which the energy for the peripheral units is additionally transmitted. The outlay for wiring between the control device and peripheral units can thus be minimized. In particularly advantageous fashion, the bus system can be used to trigger safety systems in motor vehicles, continuous diagnosis of the operational readiness of the peripheral units being possible in that context. The reply from the peripheral units is accomplished in particularly simple fashion via a short circuit of the bus lines.


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patent: 5969631 (1999-10-01), Ammler et al.
patent: 35 06 118 (1986-08-01), None

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