Multiplex transmission system for use in a vehicle
First Claim
1. A multiplex transmission system for use in a vehicle wherein a plurality of multiplex communication nodes are connected to a common multiplex transmission path, the system comprising:
- (a) detection means for detecting transmission errors at said plurality of multiplex communication nodes and/or in the transmission path; and
(b) wherein said plurality of multiplex communication nodes include(b1) a plurality of first communication nodes, each first communication node having a communication control unit for controlling communication between said first communication 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 second communication node having(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.
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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 (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.
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Citations
20 Claims
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1. A multiplex transmission system for use in a vehicle wherein a plurality of multiplex communication nodes are connected to a common multiplex transmission path, the system comprising:
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(a) detection means for detecting transmission errors at said plurality of multiplex communication nodes and/or in the transmission path; and (b) wherein said plurality of multiplex communication nodes include (b1) a plurality of first communication nodes, each first communication node having a communication control unit for controlling communication between said first communication 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 second communication node having (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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A multiplex transmission system for use in a vehicle comprising:
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(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, said plurality of multiplex communication nodes including; (b1) a plurality of first communication nodes, each first communication node having a communication control unit for controlling communication between said first communication 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 second communication node having; (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. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification