Sumitomo Electric Industries, Limited

Sumitomo Wiring Systems, Limited

Autonetworks Technologies, Limited

Kazuyuki Inoue

Tatsuya Izumi

Tadashi Matsumoto

Kazuki Kitagawa

Yojiro Suyama

Ryo Yamane

The in-vehicle device for receiving time synchronization information transmitted from each of a plurality of reference devices and transmitting the received time synchronization information to another device, includes: a communication unit configured to communicate with the other device; and an information processing unit configured to, if the communication unit receives a frame in which the time synchronization information is stored, store the time synchronization information in a specific queue with priority over other information, wherein the communication unit transmits the time synchronization information stored in the specific queue to the other device.

In-vehicle device, in-vehicle network system, and information processing method

A vehicle-mounted device stores delay time information of a first set and a second set. The first set includes a first transmission delay time from an external portion to a measurement reference position at a data reception time, and a second transmission delay time from an external portion to a measurement reference position at a data reception time in another device. The second set includes a third transmission delay time from a measurement reference position to an external portion at a data transmission time, and a fourth transmission delay time from a measurement reference position to an external portion at a data transmission time in the other device. A propagation delay time between the devices is measured by time synchronization information to and from the other device, the measured propagation delay time is corrected based on the stored delay time information, and time synchronization between the devices is performed.

Vehicle-mounted device, vehicle-mounted communication system, and time synchronization method

Growing community of inventors

Yokkaichi, Japan

Kazuyuki Inoue