AUTOMATIC DATA BUS WIRE INTEGRITY VERIFICATION DEVICE

• US 20170160332A9
• Filed: 12/19/2014
• Published: 06/08/2017
• Est. Priority Date: 12/19/2014
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Lawrence, Jeffrey A., Ramey, Sean M., McDowell, Enoch E., Sekora, John A., von Trotha, III, Edgar L., Lawrence, David E.
• Granted Patent: US 9,835,669 B2
• Time in Patent Office: Days
• CPC Class Codes: G01R 31/008 on air- or spacecraft, railway rolling stock or sea-going vessels
• CPC Class Codes: G01R 31/52 Testing for short-circuits, leakage current or ground faults
• CPC Class Codes: G01R 31/58 Testing of lines, cables or conductors testing of electric windings G01R31/72
• CPC Class Codes: G06F 11/221 to test buses, lines or interfaces, e.g. stuck-at or open line faults

Abstract

A device for verifying wire connectivity of a bus may include a bus connector configured to connect to a bus comprising a plurality of wires and measurement circuitry configured to perform a verification test on each wire of the bus. The verification test of each wire may include connecting a wire under test in a predetermined configuration relative to the other wires for performing the verification test and measuring a value of an electrical parameter associated with the wire under test. The verification test may also include comparing the value of the measured electrical parameter associated with the wire under test to an expected value of the electrical parameter. The wire under test passes the verification test in response to the measured value of the electrical parameter corresponding substantially to the expected value of the electrical parameter.

Claims

1. A device for verifying wire integrity of a bus, comprising:

a bus connector configured to connect to a bus comprising a plurality of wires;

measurement circuitry configured to perform a verification test on each wire of the bus, the verification test of each wire comprising;

connecting a wire under test in a predetermined configuration relative to the other wires for performing the verification test;

measuring a value of an electrical parameter associated with the wire under test; and

comparing the value of the measured electrical parameter associated with the wire under test to an expected value of the electrical parameter, the wire under test passing the verification test in response to the measured value of the electrical parameter corresponding substantially to the expected value of the electrical parameter.

2. The device of claim 1, further comprising a hand-holdable portable housing, the measurement circuitry being contained within the housing.

3. The device of claim 2, further comprising a user interface for controlling operation of the device provided on a face of the housing.

4. The device of claim 3, wherein the user interface comprises a display for providing information related to the verification test.

5. The device of claim 4, wherein the information comprises test results of the verification test on each wire of the bus.

6. The device of claim 4, wherein the information comprises an identification of the bus on which the verification test is being performed based on reading a pin configuration setting of the bus by the device.

7. The device of claim 1, further comprising a connector for connecting the measurement circuitry to a mobile computer device, the mobile computer device being configured for controlling operation of the device and storing results of the verification test of each wire of the bus.

8. The device of claim 1, wherein the verification test further comprises:

detecting a short circuit between the wire under test and another wire of the bus;

detecting a short circuit between the wire under test and a ground potential; and

indicating that the wire passed the verification test in response to not detecting the short circuit between the wire under test and the other wire of the bus and not detecting the short circuit between wire under test and the ground potential.

9. The device of claim 8, wherein detecting the short circuit between the wire under test and the other wire of the bus comprises:

connecting the wire under test to ground by the measurement circuitry;

connecting the other wire to a voltage source of the device by the measurement circuitry;

measuring a voltage across a sense resistor associated with the wire under test by the measurement circuitry; and

comparing the measured voltage to an expected voltage for the wire by the measurement circuitry, the short circuit being detected in response to the measured voltage not corresponding substantially to the expected voltage.

10. The device of claim 8, wherein detecting the short circuit between the wire under test and the ground potential comprises:

connecting a ground of an airplane including the bus to a ground of the device by the measurement circuitry;

removing any connections to other wires of the bus by the measurement circuitry;

connecting the wire under test to a voltage source of the device by the measurement circuitry;

measuring a voltage across a sense resistor associated with the wire under test by the measurement circuitry; and

comparing the measured voltage to an expected voltage for the wire by the measurement circuitry, wherein the short circuit is detected in response to the measured voltage not corresponding substantially to the expected voltage.

11. A device for verifying wire integrity of a bus, comprising:

a bus connector configured to connect to a controller area network (CAN) bus connector, the CAN bus connector being configured for connecting a plurality of CAN buses to a data concentrator, each CAN bus comprising a shielded twisted pair of wires including a CAN high wire, a CAN low wire and a CAN shield wire;

measurement circuitry configured to perform a verification test on at least the CAN high wire and CAN low wire of each CAN bus, the verification test of each CAN bus comprising;

connecting a wire under test in a predetermined configuration relative to the other wire for performing the verification test;

measuring a value of an electrical parameter associated with the wire under test; and

comparing the value of the measured electrical parameter associated with the wire under test to an expected value of the electrical parameter, the wire under test passing the verification test in response to the measured value of the electrical parameter corresponding substantially to the expected value of the electrical parameter.

12. The device of claim 11, further comprising a module to read configuration pin settings of the CAN bus connector to determine an identification of the data concentrator from the configuration pin settings.

13. The device of claim 12, further comprising a user interface, the user interface comprising:

features for controlling operation of the device; and

a display for providing information related to the verification test, the information comprising an identification of the data concentrator associated with CAN bus on which the verification test is being performed and test results of the verification test.

14. The device of claim 11, wherein the verification test of a particular CAN bus further comprises:

detecting a short circuit between a particular CAN high wire under test and an associated CAN low wire by the measurement circuit;

detecting a short circuit between the particular CAN high wire under test and a ground potential by the measurement circuit; and

detecting a short circuit between the associated CAN low wire and a ground potential by the measurement circuit, the particular CAN bus passing the verification test in response to not detecting any short circuits.

15. The device of claim 14, wherein the CAN bus is onboard an airplane and wherein detecting the short circuit between the particular CAN high wire under test and the associated CAN low wire comprises:

connecting the associated CAN low wire to ground potential;

removing any connection of the device to a ground of the airplane;

connecting the particular CAN high wire to a voltage source of the device;

measuring a voltage across a sense resistor associated with the particular CAN high wire;

comparing the measured voltage to an expected voltage for the particular CAN high wire, the short circuit not being detected in response to the measured voltage corresponding substantially to the expected voltage.

16. The device of claim 14, wherein detecting the short circuit between the associated CAN low wire and ground comprises:

connecting a ground of the device to a ground of an airplane;

removing all connections to the particular CAN high wire;

connecting the associated CAN low wire to a voltage source of the device;

measuring a voltage across a sense resistor associated with the associated CAN low wire;

comparing the measured voltage to an expected voltage for the associated CAN low wire, the short circuit not being detected in response to the measured voltage corresponding substantially to the expected voltage.

17. The device of claim 14, wherein detecting the short circuit between the particular CAN high wire and ground comprises:

connecting a ground of the device to a ground of an airplane;

removing all connections to the associated CAN low wire;

connecting the particular CAN high wire to a voltage source of the device;

measuring a voltage across a sense resistor associated with the particular CAN high wire;

comparing the measured voltage to an expected voltage for the particular CAN high wire, the short circuit not being detected in response to the measured voltage corresponding substantially to the expected voltage.

18. A method for verifying wire integrity of a bus, comprising:

detecting connection to a bus connector, the bus connector being configured to connect a plurality of buses to an apparatus and each bus comprising a plurality of wires;

automatically performing a verification test of each bus, the verification test of each bus comprising;

connecting a wire under test in a predetermined configuration relative to the other wire by measurement circuitry for performing the verification test;

measuring a value of an electrical parameter associated with the wire under test; and

comparing the value of the measured electrical parameter associated with the wire under test to an expected value of the electrical parameter, the wire under test passing the verification test in response to the measured value of the electrical parameter corresponding substantially to the expected value of the electrical parameter.

19. The method of claim 18, further comprising reading a configuration pin setting of the bus connector to determine an identification of the apparatus from the configuration pin setting.

20. The method of claim 18, wherein the verification test comprises:

detecting a short circuit between the wire under test and another wire of the bus;

detecting a short circuit between the wire under test and a ground potential; and

indicating that the wire passed the verification test in response to not detecting the short circuit between the wire under test and the other wire of the bus and not detecting the short circuit between wire under test and the ground potential.