TIME DOMAIN REFLECTOMETRY SYSTEM AND METHOD

• US 20130221974A1
• Filed: 02/14/2013
• Published: 08/29/2013
• Est. Priority Date: 02/29/2012
• Status: Abandoned Application

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: JULSON, TIMOTHY D., TARASKI, GARY W., WILL, KIMBERLEY R., PRATT, KHARA D.
• Application Number:
  US13/767,384
• Publication Number:
  US 20130221974A1
• Time in Patent Office: Days
• US Class Current: 324/503
• CPC Class Codes: G01R 31/007 using microprocessors or computers
• CPC Class Codes: G01R 31/11 using pulse reflection methods
• CPC Class Codes: G01R 31/2841 Signal generators
• CPC Class Codes: G01R 31/66 Testing of connections, e.g. of plugs or non-disconnectable joints testing for incorrect line connections G01R31/55

Abstract

Methods and systems are provided for determining conductor abnormalities using time reflectometry. The system includes a database configured to store data regarding an impedance of at least one element of an electric circuit. The system also includes a pulse generator for generating a signal pulse. A transmitter is in communication with the pulse generator for transmitting the signal pulse into the electric circuit. The system further includes a receiver for receiving a reflection of the signal pulse from the electric circuit. A processor in communication with the receiver and the database is configured to determine an abnormal condition based on the received reflection of the signal pulse and the data stored in the database.

Claims

1. A time domain reflectometry (“

TDR”

) system, comprising;

a database configured to store data regarding an impedance of at least one element of an electric circuit;

a pulse generator for generating a signal pulse;

a transmitter in communication with said pulse generator for transmitting the signal pulse into the electric circuit;

a receiver for receiving a reflection of the signal pulse from the electric circuit; and

a processor in communication with said receiver and said database and configured to determine an abnormal condition based on the received reflection of the signal pulse and the data stored in said database.

2. A TDR system as set forth in claim 1 wherein at least one of the elements of the electric circuit is a wire crimp.

3. A TDR system as set forth in claim 2 wherein the data of said database includes a normal impedance range for the wire crimp.

4. A TDR system as set forth in claim 2 wherein the wire crimp is part of a terminal.

5. A TDR system as set forth in claim 4 wherein at least part of the terminal is disposed in a non-conductive connector.

6. A TDR system as set forth in claim 4 wherein the terminal is further defined as a pin.

7. A TDR system as set forth in claim 4 where the terminal is further defined as a socket.

8. A TDR system as set forth in claim 1 wherein at least one of the elements of the electric circuit is a wire.

9. A TDR system as set forth in claim 1 wherein said electric circuit is further defined as a plurality of electric circuits.

10. A vehicle, comprising:

a plurality of electric circuits; and

an on-board TDR system including

a database configured to store data regarding impedances of elements of the plurality of electric circuits,

a pulse generator for generating a signal pulse,

a transmitter in communication with said pulse generator for transmitting the signal pulse into the electric circuit,

a receiver for receiving a reflection of the signal pulse from the electric circuit, and

a processor in communication with said receiver and said database and configured to determine an abnormal condition based on the received reflection of the signal pulse and the data stored in said database.

11. A vehicle as set forth in claim 10 wherein at least one of the elements of the electric circuit is a wire crimp.

12. A vehicle as set forth in claim 11 wherein the data of said database includes a normal impedance range for the wire crimp.

13. A vehicle as set forth in claim 11 wherein the wire crimp is part of a terminal.

14. A vehicle as set forth in claim 13 wherein at least part of the terminal is disposed in a non-conductive connector.

15. A vehicle as set forth in claim 10 wherein at least one of the elements of the electric circuit is a wire.

16. A method of sensing abnormalities in an electric circuit, comprising:

storing data regarding impedances of at least one element of an electric circuit in a database;

generating a signal pulse;

transmitting the signal pulse into the electric circuit;

receiving a reflection of the signal pulse from the electric circuit; and

determining an abnormal condition based on the received reflection of the signal pulse and the data stored in the database.

17. A method as set forth in claim 16 wherein the at least one element is a wire crimp and wherein storing data regarding impedances comprises storing a normal impedance range for the wire crimp.

18. A method as set forth in claim 16 wherein determining an abnormal condition comprises comparing the reflection of the signal pulse to the normal impedance range.

19. A method as set forth in claim 16 further comprising alerting a user to the abnormal condition in response to an abnormal condition being determined.