EP0475406A2
Expired / Lapsed
EP
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Multiplex transmission system
Assignee: Mazda Motor Corp
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Filing: 1991-09-12
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Granted: —
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Expires: 2011-09-12
Abstract
Abstract In a multiplex transmission system wherein data is transmitted among a plurality of control units connected to a multiplex transmission line in decentralized fashion, communication is performed upon changing the period of the data transmission among the control units and the method of transmission, such as the order of priority of transmission, in dependence upon the travelling state of the vehicle equipped with the multiplex transmission system, the operating states of the control units or the control unit which is a party to the communication.
Inventors
- 👤 Masao Hideshima
- 👤 Osamu Michihira
- 👤 Yoshikazu Nobutoki
- 👤 Akira Sone
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 03:50
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/42; B; B60; B60R; B60R16/00; B60R16/02; B60R16/03; B60R16/0315; B60R2016/0322; H04L12/40; H04L12/4013; H04L2012/40267; H04L2012/40273
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
A multiplex transmission system, for use in an automotive vehicle, in which a plurality of control units connected in decentralized fashion to a common transmission line transmit and receive information to and from one another, comprising: informing means for informing each control unit of the travelling state of the vehicle by providing each control unit with information; and transmission control means for changing a method in which information is transmitted among the plurality of control units, the change being made in dependence upon the travelling state of the vehicle.
Claim 2
Dependent Claim
56 words
The system according to claim 1, wherein said transmission control means is adapted to transmit information among the control units at a prescribed period under ordinary conditions, and to change the method of transmission at starting of an engine in such a manner that the information is transmitted at a period shorter than said prescribed period.
Claim 3
Dependent Claim
41 words
The system according to claim 1, wherein said transmission control means decides an order of priority for transmission of information among the plurality of control units, and changes said order of priority in dependence upon the travelling state of the vehicle.
Claim 4
Dependent Claim
56 words
The system according to claim 1, wherein said transmission control means changes over transmission of information among the plurality of control units from periodic transmission to transmission in accordance with occurrence of an event, or from transmission in accordance with occurrence of an event to periodic transmission, in dependence upon the travelling state of the vehicle.
Claim 5
Dependent Claim
58 words
The system according to claim 4, wherein said transmission control means performs transmission of information with respect to a specific control unit periodically, renders transmission of information with respect to another control unit transmission that is in accordance with occurrence of an event, and changes said specific control unit in dependence upon the traveling state of the vehicle.
Claim 6
Dependent Claim
89 words
A multiplex transmission system, for use in an automotive vehicle, in which a plurality of control units connected in decentralized fashion to a common transmission line transmit and receive information to and from one another, comprising: means for specifying a communicating-party control unit with which the plurality of control units perform transmission and reception of information; and transmission control means for performing transmission of information with respect to said specified communicating-party control unit periodically, and changing the period of this transmission in dependence upon said specified communicating-party control unit.
Claim 7
Dependent Claim
41 words
The system according to claim 6, wherein said transmission control means includes means for sensing a travelling state of the vehicle, wherein the transmission period is changed in dependence upon the communicating-party control unit and the travelling state of the vehicle.
Claim 8
Dependent Claim
135 words
A multiplex transmission system, for use in an automotive vehicle, in which a plurality of control units connected in decentralized fashion to a common transmission line transmit and receive information to and from one another, comprising: first control means for performing control in such a manner that information necessary for controlling one of the plurality of control units is transmitted from another control unit; discriminating means for determining whether operation of each control unit is in a stable state or unstable state; and second control means for changing the method of transmission control, which is performed by the first control means, between one method when a control unit is in the stable state and another method when the control unit is in the unstable state, based upon results of determination made by said discriminating means.
Claim 9
Dependent Claim
105 words
The system according to claim 8, wherein said second control means is so adapted that when said discriminating means has determined that one of the control units has performed a system reset and is in the unstable state, said second control means changes the method of transmission control, which is performed by said first control means, for a predetermined time following the system reset in such a manner that another control unit which transmits information necessary for control of said one control unit performs transmission of information at a period shorter than that which prevails when said one control unit is in the stable state.
Claim 10
Dependent Claim
128 words
The system according to claim 8, wherein said second control means is so adapted that when said discriminating means has determined that a certain control unit is in the stable state, said second control means changes the method of transmission control, which is performed by said first control means, in such a manner that another control unit which transmits information necessary for control of said certain control unit performs transmission of information in accordance with occurrence of an event, and when said discriminating means has determined that said certain control unit is in the unstable state, said second control means changes the method of transmission control, which is performed by said first control means, in such a manner that said other control unit performs transmission of information periodically.
References Cited (Backward Citations)
No citation records indexed.
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