US 12,463,844 B2
Vehicle communication system, vehicle communication method, and control device
Tatsuroh Saitoh, Tokyo (JP); Tomoya Nishino, Tokyo (JP); Hiroaki Hakukawa, Tokyo (JP); and Sora Nishigaki, Tokyo (JP)
Assigned to HONDA MOTOR CO., LTD., Tokyo (JP)
Filed by HONDA MOTOR CO., LTD., Tokyo (JP)
Filed on Mar. 22, 2023, as Appl. No. 18/187,888.
Claims priority of application No. 2022-061063 (JP), filed on Mar. 31, 2022.
Prior Publication US 2023/0318873 A1, Oct. 5, 2023
Int. Cl. H04L 12/40 (2006.01)
CPC H04L 12/40006 (2013.01) [H04L 2012/40273 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A vehicle communication system mounted on a vehicle, the vehicle communication system comprising:
a communication network including a plurality of communication transmission lines; and
a plurality of electronic control units (ECUs) connected by the communication network,
wherein each one of the ECUs includes:
an identification unit that identifies a single target ECU, and a relay transmission line and a relay ECU based on an input signal or input information, the target ECU being another one of the ECUs and being a target to which a control signal is to be transmitted, the relay transmission line and the relay ECU being a communication transmission line and still another one of the ECUs, respectively, through which the control signal toward the target ECU is routed,
a standby time determination unit that determines a transmission standby time, the transmission standby time being a time from transmission of an activation instruction for whichever is closest of the relay ECU or the target ECU along the relay transmission line to the transmission of the control signal, and
a communication unit that transmits the control signal after an elapse of the transmission standby time after transmitting the activation instruction to a relay transmission line after transmitting the activation instruction to a relay transmission line directly connected to the communication unit and without transmitting the activation instruction to a relay transmission line connected to the communication unit through another ECU,
wherein the communication transmission lines include:
a synchronous communication bus that allows communication to start synchronously between all ECUs connected to the synchronous communication bus, and
an asynchronous communication bus that allows communication to start asynchronously between ECUs connected to the asynchronous communication bus, and
wherein when the directly connected relay transmission line is the asynchronous communication bus, the communication unit repeatedly sends out, to the asynchronous communication bus, the activation instruction to which is closest of the relay ECU or the target ECU at predetermined time intervals.