Multiplex transmission system for automotive vehicles
First Claim
1. A multiplex transmission system for automotive vehicles, having a plurality of communication nodes interconnected via a common multiplex transmission line, each of said plurality of communication nodes comprising:
- communication control means for controlling communication among said communication nodes in accordance with a decentralized multiplex protocol;
transmitting means for transmitting a reception acknowledgement signal to the multiplex transmission line in a transmission phase when reception data from the other communication nodes via the multiple transmission line has been received errorless in a reception phase;
memory means for storing beforehand reception acknowledgment reference patterns from respective ones of said communication nodes, each of the reference patterns defining a power ON/OR condition of each communication node;
detection means for detecting a current power ON/OFF condition;
comparator means for comparing, after a transmission, a signal pattern having actual reception acknowledgement signals from the other communication nodes with the reference pattern which corresponds to a power ON/OFF condition detected by the detection means; and
re-transmission control means for performing re-transmission control of communication among said communication nodes based on the results of the comparison by said comparator means.
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Abstract
A multiplex transmission system for automotive vehicles includes a plurality of communication nodes interconnected via a common multiplex transmission line. Each communication node includes a communication control device for controlling communication among the communication nodes in accordance with a decentralized multiplex protocol, a transmitting device for transmitting a reception acknowledgement signal to the multiplex transmission line upon receiving reception data from the multiplex transmission line normally in a reception mode, a memory device for storing beforehand, as data in table form, reception acknowledgment signals from respective ones of the communication nodes in a predetermined state, a comparator device for comparing, after a transmission, an actual reception acknowledgment signal from each communication node with the data table in a transmission mode, and a re-transmission control device for performing re-transmission control of communication among the communication nodes based on the results of the comparison.
42 Citations
8 Claims
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1. A multiplex transmission system for automotive vehicles, having a plurality of communication nodes interconnected via a common multiplex transmission line, each of said plurality of communication nodes comprising:
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communication control means for controlling communication among said communication nodes in accordance with a decentralized multiplex protocol; transmitting means for transmitting a reception acknowledgement signal to the multiplex transmission line in a transmission phase when reception data from the other communication nodes via the multiple transmission line has been received errorless in a reception phase; memory means for storing beforehand reception acknowledgment reference patterns from respective ones of said communication nodes, each of the reference patterns defining a power ON/OR condition of each communication node; detection means for detecting a current power ON/OFF condition; comparator means for comparing, after a transmission, a signal pattern having actual reception acknowledgement signals from the other communication nodes with the reference pattern which corresponds to a power ON/OFF condition detected by the detection means; and re-transmission control means for performing re-transmission control of communication among said communication nodes based on the results of the comparison by said comparator means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A multiplex transmission system for automotive vehicles, having a plurality of communication nodes interconnected via common multiplex transmission line, said plurality of communication nodes comprising:
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a management node and a plurality of ordinary nodes, each of said plurality of ordinary nodes having (a) communication control means for controlling communication among said communication nodes in accordance with a decentralized multiplex protocol; (b) transmitting means for transmitting a reception acknowledgement signal to the multiplex transmission line upon receiving reception data from the multiplex transmission line normally in a reception node; (c) memory means for storing beforehand, as data in table form, reception acknowledgment signals from respective ones of said communication nodes in a predetermined state, wherein said predetermined state is a power supply state which changes in dependence upon position of an engine key, active nodes among said plurality of communication nodes being decided in each power supply state; (d) comparator means for comparing, after a transmission, an actual reception acknowledgment signal from each communication node with said data in table form in a transmission mode; and (e) re-transmission control means for performing re-transmission control communication among said communication nodes based on results of the comparison by first comparator means; and said management node having (f) reading means for reading reception acknowledgment signals exchanged among said plurality of ordinary nodes; (g) memory means for storing beforehand, as data in table form, reception acknowledgement signals from respective ones of said communication nodes in a predetermined state; (h) comparator means for comparing a reception acknowledgement signal read by said reading means with said data in table form; and (i) management means for performing network management based on results of the comparison by said management node comparator means. - View Dependent Claims (8)
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Specification