Toyota Jidosha Kabushiki Kaisha

Teppei Fukuzawa

Masaki Miyake

Shuji Matsuno

Takeshi Matsui

Yoshinari Takeyama

A communication system includes a transmitting device group and a receiving device configured to receive data sets. The receiving device is configured to determine reliabilities of the received data sets and manage assignment rates of message authentication codes, which are set for respective types of data sets. The transmitting device group is configured to generate message authentication codes for data sets, and transmit data sets after assigning the generated message authentication codes to the data sets at assignment rates. The receiving device is configured to change, when it is determined that the reliability of a first data set has been reduced, the assignment rate for the first data set to a value greater than that before the change and change the assignment rate for a second data set, which is of a type different from the first data set, to a value less than that before the change.

Communication system and receiving device

A specific on-board device, that is any one of a plurality of on-board devices, is configured to acquire the versions of software included in other on-board devices when the power source of a vehicle is turned on. The specific on-board device determines whether or not the versions of the software of all the on-board devices that constitute a vehicle control system are consistent, by comparing the version of the software of the specific on-board device and the versions of the software acquired from the other on-board devices with first consistency information prestored.

Vehicle control system and method for confirming software consistency

A vehicle control system includes a plurality of devices, a first device included in the devices including: a storage configured to store consistency information including a permitted combination of versions of software installed on each of one or more devices in association with each of the control functions; a determination unit configured to determine whether the consistency information consistent with versions of software installed on a part of the devices exists when consistency does not exist in the versions of all software installed on each of the devices; and a performance control unit configured to permit performance of a part of control functions associated with the consistency information consistent with the versions of software installed on the part of the devices when the consistency information consistent with the versions of software installed on the part of the devices exists.

Vehicle control system and vehicle control method

A vehicle control system comprising: a driving control device that includes a first processor and controls a driving section at a vehicle; a control instructing device includes a second processor and controls the driving control device by giving instructions by communication to the driving control device; and a communication path connects a plurality of control devices, including the control instructing and the driving control devices, the plurality of control devices communicate with one another, wherein the vehicle control system is structured wherein the first and second processors respectively compare a communication period of communication with another control device via the communication path, and a reference period that is stored in advance, based on results of comparisons on the communication period and the reference period that have been carried out by the first processor and the second processor, the second processor judges that there is an attack on the communication path.

Vehicle control system, attack judging method, and recording medium on which program is recorded

A vehicle control system includes a plurality of in-vehicle devices. Each of the in-vehicle devices includes a compatibility information storing unit that stores compatibility information including an allowable combination of software versions of all the in-vehicle devices constituting the vehicle control system. A particular in-vehicle device as one of the in-vehicle devices includes an obtaining unit that obtains software versions of the other in-vehicle devices, and compatibility information held by the other in-vehicle devices, a compatibility information specifying unit that specifies proper compatibility information, from the compatibility information stored in the particular in-vehicle device, and the compatibility information obtained from the other in-vehicle devices, and a determining unit that determines whether the software versions of all the in-vehicle devices constituting the vehicle control system are compatible, by checking the software version of the particular in-vehicle device, and those obtained from the other in-vehicle devices, against the proper compatibility information.

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Toyota, Japan

Teppei Fukuzawa