A transceiver for a CAN bus system and a method for detecting a short circuit using a CAN transceiver. The transceiver includes a transmitter for transmitting a transmission signal to a first bus wire of a bus of the bus system, exclusive, collision-free access to the bus of the bus system of a user station being at least temporarily ensured in the bus system, and for transmitting the transmission signal to a second bus wire of the bus, a receiver for receiving the bus signal transmitted on the bus wires, and a diagnostic unit for detecting a short circuit in the bus system, the diagnostic unit being designed to carry out a diagnosis only in a predetermined communication phase of the bus signal.

An embodiment method of operating a CAN bus comprises coupling a first device and second devices to the CAN bus via respective CAN transceiver circuits, and configuring the respective CAN transceiver circuits to set the CAN bus to a recessive level during transmission of messages via the CAN bus by the respective first device or second devices.

A communication system, in which a plurality of nodes communicate with each other according to a communication protocol, which wakes up some of the plurality of nodes when a communication frame containing specific start information occurs on or is transmitted to the communication bus, includes a master node determines, for each of slave nodes, a start condition, which is a condition for transition of a subject node from a sleep state to a normal state. The master node transmits, to the communication bus, the determined start condition tailored for each of the slave nodes for a reception thereof by each of the slave nodes.

A fault check circuit, including a first channel comparator to output a first channel comparator output signal indicating whether a first channel digital signal is outside of a first channel threshold range, wherein the first channel digital signal is A/D converted from a first channel analog signal; a second channel comparator to output a second channel comparator output signal indicating whether a second channel digital signal is outside of a second channel threshold range, wherein the second channel digital signal is A/D converted from a second channel analog signal; and an alarm generator circuit to combine the first and second channel comparator output signals, and output a fault check signal, wherein the first and second channel comparators and the alarm generator circuit are implemented in hardware, and the fault check circuit performs a fault check without software intervention.

A bus emulator device includes a first computer, a second computer, and an information interface. The first computer is configured to connect to a main bus system. The first computer includes at least write access into the information interface, and the second computer includes only read access into the information interface. In other aspects, the first computer includes only write access into the information interface, and the second computer includes at least read access into the information interface.

An in-vehicle communication system, comprises: a first in-vehicle communication device and a second in-vehicle communication device transmitting and receiving a signal to and from each other by a predetermined communication protocol related to Ethernet® (registered trademark), wherein the first in-vehicle communication device includes a PHY unit having a communication circuit, and a determination processing unit for determining whether or not the second in-vehicle communication device is in a link-down sleep state, when determined that the second in-vehicle communication device is in the sleep state, the PHY unit outputs a predetermined signal to the second in-vehicle communication device, and the second in-vehicle communication device includes a PHY unit having a communication circuit, a detection circuit for detecting the predetermined signal input to the PHY unit, and a power supply circuit for waking up the PHY unit when the detection circuit detects the predetermined signal.

An in-vehicle communication device includes: an abnormality detection unit detecting abnormalities in in messages received by a reception unit receiving messages from one or more other devices; an estimation unit estimating normal information corresponding to information in which abnormalities have been detected; and a replacement unit replacing information included in messages received by the reception unit with information estimated by the estimation unit. The in-vehicle communication device may include: a first determination unit that determines whether messages received by the reception unit are periodic or non-periodic messages; and a second determination unit that, for a message determined as being periodic by the first determination unit, determines whether or not the periodic message has been transmitted at a predetermined cycle, and the abnormality detection unit may detect abnormalities in information included in periodic messages determined as having been transmitted at predetermined cycles by the second determination unit.

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.

The disclosure relates to a transceiver device for communicating between a network protocol controller and a network bus, the transceiver device comprising: transceiver circuitry configured to transmit and receive data on the network bus using a first physical layer protocol; and monitoring circuitry configured to determine a measured property of the network bus, in which the transceiver device is configured to: determine whether the measured property indicates an error condition; and reconfigure the transceiver circuitry to transmit and receive data on the network bus using a second physical layer protocol in response to determining the error condition.

A method for protecting against cyber attacks in a communication network of a vehicle, including the steps of acquiring dominant voltage measurements; obtaining an electrical characteristic of nodes that transmit messages by acquiring consecutive groups of voltage measurements at receiving nodes and calculating a distribution thereof; calculating values of distribution statistics; calculating a cumulative voltage deviation for each value of statistic; and obtaining a voltage profile by adding the cumulative voltage deviations of each statistic, executing a malicious-node detection procedure and then executing a transmitting-node identification procedure including comparing the at least one characteristic parameter against all the corresponding characteristic parameters of all the messages, defining a range of variation of the characteristic parameter with respect to a given number of previous samples; and evaluating whether the value of the parameter falls within the range of variation of one of the messages and identifying as malicious the node that transmits the message.