A method for operating a wireless field-device network, comprising: wirelessly transmitting a process variable and an expected remaining running time from each field device to the other field devices within a field-device network so that in each field device the process variable and the expected remaining running time of the other field devices of the field-device network are stored; activating a second radio module of that field device which has the highest expected remaining running time, and deactivating the second radio modules of the other field devices within the field-device network; wirelessly transmitting the process variables of all field devices of the field-device network stored in the active field device, or at least a subset of the stored process variables, to the superordinate unit, which is not part of the field-device network, by means of the second radio module of the active field device.

A communication redundancy system for an autonomous vehicle includes: a vehicle network domain including a bus configured to transmit a signal, terminal end resistors disposed at both ends of the bus, and a plurality of electronic control units (ECUs) connected to the bus; a plurality of gateways connected to the vehicle network domain; and a high-level ECU connected to the plurality of gateways and configured to control the plurality of ECUs to implement autonomous driving of a vehicle. Each of the plurality of gateways detects disconnection of the bus in the vehicle network domain and, when the disconnection of the bus is detected, the plurality of gateways transmit pieces of data of the plurality of ECUs to the high-level ECU.

A plurality of zones is formed in a communication network on the vehicle, and a communication path in a loop form is formed in each zone by zone trunk lines and a backup line. The backup line is connected by a switch only at the time of disconnection so that the loop is not closed. At the time of disconnection detection, an instruction is automatically given to rewrite content of routing maps on zone ECUs and a central gateway. Since each node preferentially selects a communication path that bypasses a disconnection portion from the start of communication by rewriting the content of the routing maps, it is possible to avoid an increase in communication delay. An inter-zone backup line connecting a plurality of zones is provided to enable the use of a new path across the plurality of zones at the time of disconnection.

A CANopen-based data transmission gateway changeover method includes: making an active gateway go alive, and mutually monitoring heartbeat packet status together with a standby gateway over an active-standby gateway communications network; keeping the active gateway alive and recording a breakdown of the standby gateway if no heartbeat packet of the standby gateway is detected within a preset heartbeat period and a heartbeat packet of the active gateway is successfully transmitted on the active-standby gateway communications network; requesting the standby gateway to go alive if the heartbeat packet of the active gateway fails to be transmitted on the active-standby gateway communications network; stopping requesting the standby gateway in a first in-vehicle communications network to go alive, and requesting the standby gateway to go alive; and keeping the active gateway alive and recording a breakdown of the standby gateway if still no response is received from the standby gateway.

The disclosure relates to a transceiver device, an electronic control unit and an associated method. The transceiver device is suitable for communicating between one or more network protocol controllers and a network bus and comprises: first interface circuitry configured to communicate with the one or more network protocol controllers; second interface circuitry configured to communicate with the one or more network protocol controllers; and selector circuitry configured to switch communication with the one or more network protocol controllers from the first interface circuitry to the second interface circuitry in response to a communication error in data carried on the first interface circuitry.

A relay device system is a relay device system to be installed in a vehicle, the relay device system including a wireless relay device configured to wirelessly communicate with a communication device provided outside the vehicle, a plurality of wired relay devices that are connected in a ring to the wireless relay device, and an in-vehicle network formed in a ring by a communication line connecting the wireless relay device and the plurality of wired relay devices, in which the plurality of wired relay devices each include an ECU communication unit configured to communicably connect to an ECU for controlling an on-board device installed in the vehicle, and the wireless relay device and the plurality of wired relay devices are configured to communicate with each other through the in-vehicle network, using two clockwise and counterclockwise paths.

A communication network on board a vehicle is a deterministic switched Ethernet network using virtual links, including a set of subscriber devices and a set of switches in which communications are performed redundantly. To manage redundancy, each data frame transmitted on a virtual link includes a frame number in a numbering field of the frame. The transmitter and/or receiver subscriber devices on the virtual link take into account a length of the numbering field equal to a first predetermined length when the BAG value associated with the virtual link is greater than or equal to a predetermined BAG value, otherwise equal to a second predetermined length greater than the first length.

The present disclosure discloses a CANopen-based data transmission gateway changeover method, system and apparatus. The method includes: making an active gateway go alive, and mutually monitoring heartbeat packet status together with a standby gateway over an active-standby gateway communications network; keeping the active gateway alive and recording a breakdown of the standby gateway if no heartbeat packet of the standby gateway is detected within a preset heartbeat period and a heartbeat packet of the active gateway is successfully transmitted on the active-standby gateway communications network; requesting, by the active gateway over any in-vehicle communications network, the standby gateway to go alive if the heartbeat packet of the active gateway fails to be transmitted on the active-standby gateway communications network; stopping requesting, by the active gateway if no response is received from the standby gateway, the standby gateway in a first in-vehicle communications network to go alive, and requesting, over another in-vehicle communications network, the standby gateway to go alive; and keeping the active gateway alive and recording a breakdown of the standby gateway if still no response is received from the standby gateway. In this way, sound operation of an entire train is ensured and redundancy effects of a train network are improved.

A system of communicating data over a high availability industrial control system is disclosed. The industrial control system includes a first data producer, a second data producer in communicative connection with the first data producer, a first data consumer, and a second data consumer in communicative connection with the first data consumer. The system further includes the first producer communicating the data over multiple connection paths from the first producer to the first consumer and the second consumer through intermediate modules, and the second producer communicating the data over multiple connection paths from the second producer to the first consumer and the second consumer through intermediate modules. Also disclosed is a method of communicating data over the high availability industrial control system.

A switch device installed in a vehicle is provided with: a switch unit configured to relay communication data between a plurality of function units installed in the vehicle; a storage unit configured to hold the communication data to be relayed; and a control unit configured to determine a state of the storage unit, and adjust, for each of applications, a throughput of the communication data to be transmitted from the function units, based on a result of the determination.