Method for diagnosing a network

• US 6,795,941 B2
• Filed: 12/21/2000
• Issued: 09/21/2004
• Est. Priority Date: 12/21/2000
• Status: Expired due to Fees

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Nickels, Robert Alen
• Primary Examiner(s): Decady, Albert
• Assistant Examiner(s): ABRAHAM, ESAW T
• Application Number:
  US09/746,288
• Publication Number:
  US 20020083378A1
• Time in Patent Office: 1,370 Days
• Field of Search: 714/2, 714/4, 714/706, 714/704, 714/25, 709/224
• US Class Current: 714/706
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 1/20 using signal quality detector

Abstract

The present invention, in one embodiment, is a network having at least one controllable CAN-based sensor device having a microcontroller, a power source and at least one host controller. Preferably, the network is a Smart Distributed System-based network. In this embodiment, each microcontroller communicates with the controller, generating and storing a value in at least one counter when a successful message is transmitted to the controller. When a unsuccessful message is detected by the microcontroller, a counter generates and stores a second or decremental value in the same or different counter. When the sum total value of error messages in the counter reaches a marginal critical value, a message is transmitted to the controller while maintaining the microcontroller'"'"'s communication with the network. When a counter reaches a critical value, the microcontroller enters a bus off mode and disconnects the sensor device, and thus the microcontroller, from the network.

Claims

1. A method for diagnosing a network having a computer in communication with at least one controllable CAN-based microcontroller in a sensing device, the method comprising the steps of:

(a) allowing each microcontroller to generate and store network communication errors in at least one counter;

(b) if the counter reaches a marginally critical value in a particular microcontroller, allowing the particular microcontroller to notify the computer, wherein the particular microcontroller continues to communicate with the computer; and

(c) if the counter reaches a critical value in a particular microcontroller, allowing the particular microcontroller to notify the computer and disconnect from the network, wherein the particular microcontroller does not continue to communicate with the computer.

2. The method of claim 1, the network being a SDS-based network.

3. The method of claim 2, each counter being integrally formed on the microcontroller.

4. The method of claim 3, the at least one counter further comprising an incremental counter, a decremental counter and a sum value counter.

5. The method of claim 2, the marginally critical value being equal to or less than 128.

6. The method of claim 5, each microcontroller being programmed to enter a passive mode when the marginally critical value is equal to or greater than 128.

7. The method of claim 5, the critical value being equal to or less than 256.

8. The method of claim 7, each microcontroller being programmed to enter a bus off mode when the critical value is equal to or greater than 256.

9. The method of claim 2, each microcontroller storing power cycle information.

10. The method of claim 9, the power cycle information being stored in the at least one counter, the power cycle information further comprising a total cumulative number of power cycles, power cycles since last reset, total power-on time of the device and power on time since last reset.

11. A method for diagnosing a controllable sensor'"'"'s health within a network, the method comprising the steps of:

(a) operating a network having a computer in communication with at least one controllable sensor, each sensor having a CAN-based microcontroller with at least a first and second counter;

(b) allowing each microcontroller to generate and store network communication errors in the at least first counter;

(c) if the at least first counter reaches a marginally critical value in a particular microcontroller, allowing the particular microcontroller to notify the computer, wherein the particular microcontroller continues to communicate with the computer;

(d) if the at least first counter reaches a critical value in a particular microcontroller, allowing the particular microcontroller to notify the computer and disconnect from the network, wherein the particular microcontroller does not continue to communicate with the computer; and

(e) allowing each microcontroller to generate and store power cycle information in the at least second counter.

12. The method of claim 11, the network being a SDS-based network.

13. The method of claim 12, the at least first counter further comprising an incremental counter, a decremental counter and a sum value counter.

14. The method of claim 13, the marginally critical value being equal to or less than 128.

15. The method of claim 14, each microcontroller being programmed to enter a passive mode when the marginally critical value is equal to or greater than 128.

16. The method of claim 14, the critical value being equal to or less than 256.

17. The method of claim 16, each microcontroller being programmed to enter a bus off mode when the critical value is equal to or greater than 256.

18. The method of claim 17, the power cycle information further comprising a total cumulative number of power cycles, power cycles since last reset, total power-on time of the device and power on time since last reset.

19. The method of claim 18, each microcontroller on each sensor further coupled to at least one visual indication means and a sensing element, the method further comprising the steps of allowing the microcontroller to control the visual indication means to generate at least a first blink pattern, a second blink pattern and a third blink pattern.

20. The method of claim 19, the first blink pattern corresponding to the microcontroller'"'"'s communication with the network.

21. The method of claim 19, the first blink pattern corresponding to the microcontroller'"'"'s failure to communicate with the network.

22. The method of claim 19, the third blink pattern corresponding to the microcontroller'"'"'s communication with each sensing element.

23. A method for diagnosing potential or impending failures on one or more controllable devices in a network, the method comprising the steps of:

(a) operating a network having a host controller in communication with at least one controllable sensor, each sensor having a CAN-based microcontroller with a counter, each microcontroller further coupled to at least one visual indication means and a sensing element;

(b) allowing each microcontroller to generate and store network communication errors in the counter;

(c) if the counter reaches a marginally critical value in a particular microcontroller, allowing the particular microcontroller to notify the controller, wherein the particular microcontroller continues to communicate with the controller;

(d) if the counter reaches a critical value in a particular microcontroller, allowing the particular microcontroller to notify the controller and disconnect from the network, wherein the particular microcontroller does not continue to communicate with the controller;

(e) allowing each microcontroller to generate and store power cycle information in the at least second counter; and

(f) allowing the microcontroller to control the visual indication means to generate a blink pattern corresponding to the microcontroller'"'"'s communication with the network and operation of the corresponding sensing element.

24. The method of claim 23, the network being a SDS-based network.

25. The method of claim 24, the counter further comprising an incremental counter, a decremental counter and a sum value counter.

26. The method of claim 25, the marginally critical value being equal to or less than 128.

27. The method of claim 26, each microcontroller being programmed to enter a passive mode when the marginally critical value is equal to or greater than 128.

28. The method of claim 26, the critical value being equal to or less than 256.

29. The method of claim 28, each microcontroller being programmed to enter a bus off mode when the critical value is equal to or greater than 256.

30. The method of claim 29, the power cycle information further comprising a total cumulative number of power cycles, power cycles since last reset, total power-on time of the device and power on time since last reset.