Vehicle electronic system, control method, relay device, and recording medium

1 . A vehicle electronic system comprising:

a first electronic device connected to a first communication network of a first communication standard;

a second electronic device connected to a second communication network of a second communication standard; and

a relay device connected to the first communication network and the second communication network, wherein

the second electronic device comprises:

a second electronic device reception unit that receives first time information indicating time synchronized in the first communication network;

a second electronic device timer unit that counts time based on the first time information; and

a second electronic device transmission unit that transmits data where second time information indicating time counted by the second electronic device timer unit is added,

the relay device comprises:

a relay device transmission unit that transmits, to the second electronic device, the first time information; and

a relay device reception unit that receives request information for requesting provision of the second time information, and

the relay device transmission unit transmits the first time information to the second electronic device, when the relay device reception unit receives the request information.

2 . The vehicle electronic system according to claim 1 , wherein the second electronic device transmission unit stops transmission of the second time information, when the second electronic device reception unit receives stop information for stopping transmission of the second time information.

3 . The vehicle electronic system according to claim 1 , wherein the relay device transmission unit transmits, to the second electronic device, the first time information, and elapsed time information indicating elapsed time that is from start of generation of the first time information till transmission of the first time information generated.

4 . The vehicle electronic system according to claim 1 , wherein

the first communication standard is Ethernet (registered trademark) standard, and

the second communication standard is CAN standard.

5 . The vehicle electronic system according to claim 1 , wherein

the first electronic device comprises an absolute time reception unit that receives absolute time information indicating absolute time, and

the time indicated in the first time information is the absolute time indicated in the absolute time information received by the absolute time reception unit.

6 . A control method of a vehicle electronic system comprising a first electronic device connected to a first communication network of a first communication standard, a second electronic device connected to a second communication network of a second communication standard, and a relay device connected to the first communication network and the second communication network, the control method comprising:

by the second electronic device,

receiving first time information indicating time synchronized in the first communication network;

counting time based on the first time information; and

transmitting data where second time information indicating time counted by a second electronic device timer unit, of the second electronic device, is added; and

by the relay device,

receiving request information for requesting provision of the second time information; and

transmitting to the second electronic device, the first time information when receiving the request information.

7 . A relay device connected to a first communication network of a first communication standard where a first electronic device is connected, and a second communication network of a second communication standard where a second electronic device is connected, the relay device comprising:

a relay device transmission unit that transmits, to the second electronic device, first time information indicating time synchronized in the first communication network; and

a relay device reception unit that receives request information for requesting provision of second time information indicating time counted by the second electronic device based on the first time information,

wherein the relay device transmission unit transmits the first time information to the second electronic device, when the relay device reception unit receives the request information.

8 . A non-transitory computer readable recording medium recording a program causing a processor of a relay device that is connected to a first communication network of a first communication standard where a first electronic device is connected, and a second communication network of a second communication standard where a second electronic device is connected, to function as:

a relay device transmission unit that transmits, to the second electronic device, first time information indicating time synchronized in the first communication network; and

a relay device reception unit that receives request information for requesting provision of second time information indicating time counted by the second electronic device based on the first time information,

wherein the relay device transmission unit transmits the first time information to the second electronic device, when the relay device reception unit receives the request information.

9 . A vehicle electronic system comprising:

a first electronic device connected to a first communication network of a first communication standard;

a second electronic device connected to a second communication network of a second communication standard; and

a relay device connected to the first communication network and the second communication network, wherein

the second electronic device comprises:

a second electronic device reception unit that receives first time information indicating time synchronized in the first communication network;

a second electronic device timer unit that counts time based on the first time information; and

a second electronic device transmission unit that transmits data where second time information indicating time counted by the second electronic device timer unit is added,

the relay device comprises a relay device transmission unit that transmits, to the second electronic device, the first time information, and

the second electronic device transmission unit stops transmission of the second time information, when the second electronic device reception unit receives stop information for stopping transmission of the second time information.