EP0399491A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Multiplex transmission system for use in a vehicle
Assignee: Mazda Motor Corp
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Filing: 1990-05-22
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Granted: —
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Expires: 2010-05-22
Abstract
Abstract A multiple transmission system for use in a vehicle, in which a second node having a control function sends an command to first nodes of an ordinary type when an transmission error higher than a certain level takes place or at certain time intervals to effect system refreshment which resides in the following operation. Each of the first nodes, which has received the command, sends its status information (on, e.g., the status of an input device element such as a sensor or switch) to the other nodes. The other nodes which receive this information initialize their status (e.g., the status of an output device element such as an actuator or a motor) according to the received status information.
Inventors
- 👤 Hiroshi Kajiyama
- 👤 Osamu Michihira
- 👤 Toshimichi Tokunaga
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 01:03
CPC Classifications
H; H04; H04L; H04L43/00; H04L43/06; H04L43/065; H04L12/00; H04L12/28; H04L12/40; H04L12/407; H04L12/413; H04L12/4135; H04L43/08; H04L43/0823; H04L43/0847; H04L43/16; B; B60; B60R; B60R16/00; B60R16/02; B60R16/03; B60R16/0315; H04L2012/40267; H04L2012/40273; H04L43/0805; H04L43/0817
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
128 words
A multiplex transmission system for use in a vehicle, comprising: (a) detection means for detecting transmission errors in the system; and (b) a plurality of multiplex communication nodes mutually connected by a common multiplex transmission path, including: (b1) a plurality of first communication nodes including a communication control unit for controlling communication between said nodes based on a decentralized multiplex protocol; and (b2) a second communication node including at least a communication control unit for controlling communication through the overall system, said multiplex transmission system characterized in that said second communication node further comprises: (b2-1) command means for commanding each of said plurality of first communication nodes to supply information on the status of the corresponding node to said transmission path, when said detection means detects an error.
Claim 2
Dependent Claim
128 words
A multiplex transmission system for use in a vehicle, comprising: (a) detection means for detecting transmission errors in the system; and (b) a plurality of multiplex communication nodes mutually connected by a common multiplex transmission path, including: (b1) a plurality of first communication nodes including a communication control unit for controlling communication between said nodes based on a decentralized multiplex protocol; and (b2) a second communication node including at least a communication control unit for controlling communication through the overall system, said multiplex transmission system characterized in that said second communication node further comprises: (b2-1) command means for commanding each of said plurality of first communication nodes to supply information on the status of the corresponding node to said transmission path, when said detection means detects an error.
Claim 3
Dependent Claim
52 words
The system according to claim 1, wherein each of said plurality of first communication nodes comprises: means for receiving and analyzing status information from the other nodes after receiving the command from said second communication node; and initialization means for initializing itself according to the results of analysis of the status information.
Claim 4
Dependent Claim
43 words
The system according to claim 1, wherein said detection means includes means for observing the number of times of re-transmission of re-transmitted data supplied to said multiplex transmission path, and recognizes an error if the number of re-transmission times exceeds a predetermined number.
Claim 5
Dependent Claim
34 words
The system according to claim 1, wherein said first communication nodes are ones for electrical equipment elements of the vehicle, and the status information includes information on the status of the electrical equipment elements.
Claim 6
Dependent Claim
35 words
The system according to claim 2, wherein said first communication nodes are communication nodes for electrical equipment elements of the vehicle, and the status information includes information on the status of the electrical equipment elements.
Claim 7
Dependent Claim
35 words
The system according to claim 5, wherein the electrical equipment elements include an input device such as a switch or a sensor, and the status information includes information on the status of the input device.
Claim 8
Dependent Claim
45 words
The system according to claim 6, wherein some of said plurality of first communication nodes comprise: a node for electrical equipment elements including the input device; and another node for electrical equipments including an output device such as an actuator corresponding to the input device.
Claim 9
Dependent Claim
44 words
The system according to claim 7, wherein the initialization means of said node for the electrical equipments including the output device initializes the corresponding output device in correspondence with the information on the status of the input device contained in the status information received.
Claim 10
Dependent Claim
76 words
The system according to claim 2, wherein each of said plurality of first nodes comprises: means for transmitting the status information in the form of a frame containing information on a priority order for arbitrating a collision of data occurring on said transmission path; means for detecting the collision of data on said transmission path; and means for re-transmitting the frame containing the status information in accordance with the priority order, when the collision is detected.
Claim 11
Dependent Claim
65 words
The system according to claim 9, wherein if some of said plurality of first communication nodes include a node for electrical equipment elements including the input device, and another node for electrical equipments including an output device such as an actuator corresponding to the input device, a relatively high priority order is given to the node for the electrical elements including the input device element.
Claim 12
Dependent Claim
135 words
A multiplex transmission system for use in a vehicle, comprising: (a) observation means for observing passage of a predetermined period of time; and (b) a plurality of multiplex communication nodes mutually connected by a common multiplex transmission path, including: (b1) a plurality of first communication nodes including a communication control unit for controlling communication between said nodes based on a decentralized multiplex protocol; and (b2) a second communication node including at least a communication control unit for controlling communication through the overall system, said multiplex transmission system characterized in that said second communication node further comprises: (b2-1) command means for commanding each of said plurality of first communication nodes to transmit information on the status of the corresponding node to said transmission path, when said observation means detects passage of the predetermined period of time.
Claim 13
Dependent Claim
135 words
A multiplex transmission system for use in a vehicle, comprising: (a) observation means for observing passage of a predetermined period of time; and (b) a plurality of multiplex communication nodes mutually connected by a common multiplex transmission path, including: (b1) a plurality of first communication nodes including a communication control unit for controlling communication between said nodes based on a decentralized multiplex protocol; and (b2) a second communication node including at least a communication control unit for controlling communication through the overall system, said multiplex transmission system characterized in that said second communication node further comprises: (b2-1) command means for commanding each of said plurality of first communication nodes to transmit information on the status of the corresponding node to said transmission path, when said observation means detects passage of the predetermined period of time.
Claim 14
Dependent Claim
51 words
The system according to claim 11, wherein each of said plurality of first communication nodes comprises: means for receiving and analyzing status information from the other nodes after receiving the command from said second communication node; and means for initializing itself according to the results of analysis of the status information.
Claim 15
Dependent Claim
34 words
The system according to claim 11, wherein said first communication nodes are ones for electrical equipment elements of the vehicle, and the status information includes information on the status of the electrical equipment elements.
Claim 16
Dependent Claim
34 words
The system according to claim 12, wherein said first communication nodes are ones for electrical equipment elements of the vehicle, and the status information includes information on the status of the electrical equipment elements.
Claim 17
Dependent Claim
35 words
The system according to claim 14, wherein the electrical equipment elements include an input device such as a switch or a sensor, and the status information includes information on the status of the input device.
Claim 18
Dependent Claim
45 words
The system according to claim 14, wherein some of said plurality of first communication nodes comprise: a node for electrical equipment elements including the input device; and another node for electrical equipments including an output device such as an actuator corresponding to the input device.
Claim 19
Dependent Claim
44 words
The system according to claim 16, wherein the initialization means of said node for the electrical equipments including the output device initializes the corresponding output device in correspondence with the information on the status of the input device contained in the status information received.
Claim 20
Dependent Claim
76 words
The system according to claim 12, wherein each of said plurality of first nodes comprises: means for sending the status information in the form of a frame containing information on a priority order for arbitrating a collision of data occurring on said transmission path; means for detecting the collision of data on said transmission path; and means for re-transmitting the frame containing the status information in accordance with the priority order, when the collision is detected.
Claim 21
Dependent Claim
65 words
The system according to claim 18, wherein if some of said plurality of first communication nodes include a node for electrical equipment elements including the input device, and another node for electrical equipments including an output device such as an actuator corresponding to the input device, a relatively high priority order is given to the node for the electrical elements including the input device element.
References Cited (Backward Citations)
No citation records indexed.
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