ROUTING METHOD IN IN-VEHICLE GATEWAY DEVICE

• US 20100098095A1
• Filed: 10/19/2009
• Published: 04/22/2010
• Est. Priority Date: 10/20/2008
• Status: Active Grant

• Current Assignee: Hitachi Astemo Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi Automotive Systems Limited (Hitachi, Ltd.)
• Inventors: Kato, Seiya, Shimura, Akitoshi
• Granted Patent: US 9,049,049 B2
• Time in Patent Office: Days
• US Class Current: 370/401
• CPC Class Codes: H04L 12/4013 Management of data rate on the bus systems modifying transmission characteristics according to link quality H04L1/0001
• CPC Class Codes: H04L 12/4625 Single bridge functionality, e.g. connection of two networks over a single bridge
• CPC Class Codes: H04L 12/5692 Selection among different networks
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
• CPC Class Codes: H04L 2012/40273 the transportation system being a vehicle
• CPC Class Codes: H04L 45/306 Route determination based on the nature of the carried application
• CPC Class Codes: H04L 45/70 Routing based on monitoring results
• CPC Class Codes: H04L 47/70 Admission control; Resource allocation
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]

Abstract

A routing method and an in-vehicle gateway device having a plurality of interfaces for communication, automatic setting of routing function is enabled to perform, in consideration of characteristics of data which a connecting network handles. A network is classified to an information-system, a control-system and a safety-system, based on characteristics thereof, and which one of the systems includes a network connecting to the in-vehicle gateway device, is judged from equipments connecting to the network, or traffic of the network. Still more processing in data exchange among different classifications is set in advance.

Claims

1. A routing method in an in-vehicle gateway device which is connected to a plurality of different networks and performs transmitting and receiving of data between the above networks, the method comprising:

classifying each of the networks into any of an information-system network or a control-system network or a safety-system network, based on data flowing in each of the networks;

determining a destination network of data received from each of the networks, based on a table set in advance; and

processing and editing a data to transfer in response to level of importance of each of the networks, in the case where the above destination network is different from a receiver network.

2. The routing method in the in-vehicle gateway device according to claim 1, wherein

the step of classifying classifies a network connected with at least one apparatus for communicating with a car navigation device or an exterior part of a vehicle, as an information-system, classifies a network connected with at least one apparatus for controlling an engine, a brake or a steering, as a control-system, and classifies a network connected with at least one controller for an airbag or a pre-crash safety, as a safety-system.

3. The routing method in the in-vehicle gateway device according to claim 1, wherein

the step of classifying further comprises the steps of:

monitoring data volume flowing on each network connecting to the in-vehicle gateway device and frequency of transmission of the same kind of data;

classifying such a network that has the transmission frequency of data of equal to or lower than threshold value of transmission frequency set in advance, and has a network bus load rate of over threshold value of the bus load set in advance, as an information-system;

classifying such a network that has the transmission frequency of data of equal to or higher than threshold value of transmission frequency set in advance, and has network bus load rate of over threshold value of the bus load set in advance, as a control-system; and

classifying such a network that has the transmission frequency of data of equal to or lower than the transmission frequency set in advance, and has the network bus load rate of equal to or lower than the bus load set in advance, as a safety-system.

4. The routing method in the in-vehicle gateway device according to claim 1, wherein

in transmitting data received from the information-system network to the control-system network, it is confirmed whether a format of data received is correct or not using check sum or CRC, as well as the bus load of the control-system network as the destination is confirmed, and when the format is correct and the bus load of the control-system network as the destination is equal to or lower than predetermined rate, the data is transmitted to the control-system.

5. The routing method in the in-vehicle gateway device according to claim 1, wherein

in transmitting data received from the control-system network to the information-system network, the data is transmitted by encryption.

6. The routing method in the in-vehicle gateway device according to claim 1, wherein

when data is received from the safety-system network, the data is transmitted to the information-system network and the control-system network connected to the in-vehicle gateway device, irrespective of content of the routing.

7. The routing method in the in-vehicle gateway device according to claim 1, wherein

transmitted data to the safety-system network is destroyed irrespective of content of the routing and data output is not performed to the safety-system network.

8. An in-vehicle gateway device which is connected to a plurality of different networks and performs transmitting and receiving of data between the above networks, the gateway device comprising:

a circuit for classifying each of the networks into any of an information-system network or a control-system network or a safety-system network, based on data flowing in each of the networks;

a circuit for determining a destination network of data received from each of the networks, based on a table set in advance; and

a circuit for processing and editing a data to transfer in response to level of importance of each of the networks, in the case where the destination network is different from a receiver network.

9. The in-vehicle gateway device according to claim 8, wherein

the circuit for classifying classifies a network connected with at least one apparatus for communicating with a car navigation device or an exterior part of a vehicle, as an information-system, classifies a network connected with at least one apparatus for controlling an engine, a brake or a steering, as a control-system, and classifies a network connected with at least one controller for an airbag or a pre-crash safety, as a safety-system.

10. The in-vehicle gateway device according to claim 8, wherein

the circuit for classifying monitors data volume flowing on each network connecting to the in-vehicle gateway device, and frequency of transmission of the same kind of data,

classifies such a network that has the transmission frequency of data of equal to or lower than threshold value of transmission frequency set in advance, and has a network bus load rate of over threshold value of the bus load set in advance, as an information-system,

classifies such a network that has the transmission frequency of data of equal to or higher than threshold value of transmission frequency set in advance, and has network bus load rate of over threshold value of the bus load set in advance, as a control-system, and

classifies such a network that has the transmission frequency of data of equal to or lower than the transmission frequency set in advance, and has the network bus load rate of equal to or lower than the bus load set in advance, as a safety-system.

11. The in-vehicle gateway device according to claim 8, further comprising

a circuit, in transmitting data received from the information-system network to the control-system network, for confirming whether a format of data received is correct or not using check sum or CRC, as well as confirming the bus load of the control-system network as the destination, and when the format is correct and the bus load of the control-system network as the destination, is equal to or lower than predetermined rate, for transmitting the data to the control-system.

12. The in-vehicle gateway device according to claim 8, further comprising

a circuit, in transmitting data received from the control-system network to the information-system network, for transmitting the data by encryption.

13. The in-vehicle gateway device according to claim 8, further comprising

means, when data is received from the safety-system network, for transmitting the data to the information-system network and the control-system network connecting to the in-vehicle gateway device, irrespective of content of routing.

14. The in-vehicle gateway device according to claim 8, wherein

transmitted data to the safety-system network is destroyed irrespective of content of routing and data output is not performed to the safety-system network.