SYSTEM AND METHOD FOR A CROSS CHANNEL DATA LINK

• US 20100183016A1
• Filed: 01/19/2009
• Published: 07/22/2010
• Est. Priority Date: 01/19/2009
• Status: Active Grant

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Carlucci, Greg, Bonk, Ted, Smithgall, William Todd, Fletcher, Mitch
• Granted Patent: US 8,503,484 B2
• Time in Patent Office: Days
• US Class Current: 370/400
• CPC Class Codes: G05D 1/0077 using redundant signals or controls
• CPC Class Codes: G06F 1/14 Time supervision arrangements, e.g. real time clock
• CPC Class Codes: G06F 11/182 based on mutual exchange of the output between redundant processing components
• CPC Class Codes: H04L 2012/40273 the transportation system being a vehicle
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

Abstract

A node comprises a host computer operable to execute application tasks and to transmit data; a local time-triggered Ethernet switch operable to enforce temporal constraints on time-triggered data; and a time-triggered Ethernet controller coupled to the local time-triggered Ethernet switch and operable to be coupled to a time-triggered Ethernet switch in each of a plurality of other control nodes. The time-triggered Ethernet controller is further operable to communicate with the plurality of other control nodes to synchronize a local clock to establish a global time base and to provide a signal to the host computer for the host computer to synchronize execution of the application tasks by the host computer with the execution of application tasks in each of the plurality of other control nodes

Claims

1. A node comprising:

a host computer operable to execute application tasks and to transmit data;

a local time-triggered Ethernet switch operable to enforce temporal constraints on time-triggered data; and

a time-triggered Ethernet controller coupled to the local time-triggered Ethernet switch and operable to be coupled to a time-triggered Ethernet switch in each of a plurality of other control nodes;

wherein the time-triggered Ethernet controller is further operable to communicate with the plurality of other control nodes to synchronize a local clock to establish a global time base and to provide a signal to the host computer for the host computer to synchronize execution of the application tasks by the host computer with the execution of application tasks in each of the plurality of other control nodes.

2. The control node of claim 1, wherein the time-triggered Ethernet controller is operable to:

receive a copy of data via each of the local time-triggered Ethernet switch and the time-triggered Ethernet switch in each of the plurality of other control nodes and to select one of the plurality of received copies of data to present to the host computer.

3. The control node of claim 2, wherein the time-triggered Ethernet controller is operable to select a received copy that has passed an error detection algorithm and is determined to be valid for the time-triggered Ethernet controller.

4. The control node of claim 3, wherein if more than one of the received copies of data passed the error detection algorithm and is valid, the time-triggered Ethernet controller is operable to select one of the received copies based on a pre-determined scheme.

5. The control node of claim 1, wherein the signal provided to the host computer from the time-triggered Ethernet controller is an interrupt signals.

6. The control node of claim 1, wherein the time-triggered Ethernet switch is a gigabit time-triggered Ethernet switch and the time-triggered Ethernet controller is a gigabit time-triggered Ethernet controller.

7. A vehicle network comprising:

a plurality of sensors operable to obtain data relating to the vehicle;

a plurality of control nodes, each coupled to each of the plurality of sensors;

wherein each of the control nodes is operable to process the data obtained by the plurality of sensors and to output control signals based on the processed sensor data;

a plurality of actuators coupled to each of the plurality of control nodes to receive the control signals and operable to adjust operation of the vehicle based on the control signals; and

wherein each of the control nodes comprises;

a host computer operable to execute application tasks to process the sensor data and to generate the control signals;

a local time-triggered Ethernet switch operable to enforce temporal constraints on time-triggered data; and

a time-triggered Ethernet controller coupled to the local time-triggered Ethernet switch, the time-triggered Ethernet controller also coupled to the time-triggered Ethernet switch in each of the plurality of control nodes via a plurality of cross channel data links;

wherein the time-triggered Ethernet controller is operable to communicate with the plurality of other control nodes via the plurality of cross channel data links to synchronize a local clock to establish a global time base and to provide a synchronization signal to the host computer to synchronize execution of the application tasks by the host computer with the execution of application tasks in each of the plurality of other control nodes.

8. The network of claim 7, wherein the time-triggered Ethernet controller in each of the control nodes is operable to:

receive a copy of data via each of the local time-triggered Ethernet switch and the time-triggered Ethernet switch in each of the plurality of other control nodes and to select one of the plurality of received copies of data to present to the host computer.

9. The network of claim 8, wherein the time-triggered Ethernet controller in each of the control nodes is operable to select a received copy that has passed an error detection algorithm and is determined to be valid for the time-triggered Ethernet controller.

10. The network of claim 9, wherein if more than one of the received copies of data passed the error detection algorithm and is valid, the time-triggered Ethernet controller in each of the control nodes is operable to select one of the received copies based on a pre-determined scheme.

11. The network of claim 7, wherein the synchronization signal provided to the host computer in each of the control nodes from the respective time-triggered Ethernet controller is an interrupt signal.

12. The network of claim 7, wherein the time-triggered Ethernet switch in each of the control nodes is a time-triggered gigabit Ethernet switch and the time-triggered Ethernet controller in each of the control nodes is a time-triggered gigabit Ethernet controller.

13. The network of claim 7, wherein the control nodes are flight computers in an aircraft.

14. The network of claim 7, wherein the plurality of cross channel data links comprise copper cables.

15. The network of claim 7, wherein the plurality of control nodes comprises three control nodes.

16. A method of communicating in a network, the method comprising:

enforcing temporal constraints on data received at a time-triggered Ethernet (TTE) switch in each of a plurality of control nodes;

providing a copy of the data received from each of the TTE switches to a TTE controller in each of the plurality of control nodes via a plurality of cross channel data links (CCDL) such that each TTE controller receives a plurality of copies of the received data;

selecting, at the TTE controller in each of the plurality of control nodes, one of the plurality of copies; and

presenting the selected copy from the TTE controller in each of the plurality of control nodes to a host computer in the same control node as the respective TTE controller.

17. The method of claim 16, further comprising:

synchronizing a local clock in each of the TTE controllers to establish a global time base; and

outputting a synchronization signal from each of the TTE controllers to the host computer in the same control node to establish a time base for the host computer in each of the control nodes.

18. The method of claim 17, wherein outputting the synchronization signal comprises generating an interrupt signal.

19. The method of claim 16, wherein selecting one of the plurality of copies comprises:

executing an error detection algorithm on each of the plurality of copies;

verifying that each copy is valid for the TTE controller that received the copy; and

selecting a copy that passes the error detection algorithm and is valid for the TTE controller.

20. The method of claim 19, wherein, if more than one of the plurality of copies passes the error detection algorithm and is valid, selecting the copy comprises selecting the copy based on a pre-determined scheme.