Computerized testing method and system for wire harnesses

• US 5,852,796 A
• Filed: 11/15/1996
• Issued: 12/22/1998
• Est. Priority Date: 11/15/1996
• Status: Expired due to Fees

• Current Assignee: Lear Automotive Dearborn, Incorporated (Lear Corporation)
• Original Assignee: UT Automotive Dearborn, Inc.
• Inventors: Stepanenko, Walter K. Jr.
• Primary Examiner(s): Trammell, James P.
• Assistant Examiner(s): Nguyen, Cuong H.
• Application Number:
  US08/751,198
• Time in Patent Office: 767 Days
• Field of Search: 364/481, 364/483, 364/580, 364/487, 364/492, 364/550, 364/551.01, 364/468.02, 364/813, 364/828, 324/503, 324/538-539, 361/88, 361/93, 361/96-97, 363/79, 702/58, 702/64, 702/66-67, 702/79, 702/89, 702/176
• US Class Current: 702/176
• CPC Class Codes: G01R 1/025 concerning dedicated user interfaces, e.g. GUI, or dedicated keyboards G01R31/31912 takes precedence
• CPC Class Codes: G01R 31/007 using microprocessors or computers
• CPC Class Codes: G01R 31/58 Testing of lines, cables or conductors testing of electric windings G01R31/72
• CPC Class Codes: G01R 31/74 Testing of fuses

Abstract

A computerized testing method and system for a wire harness allows analog data regarding a characteristic of the wire harness to be received and converted into digital data. This digital data is analyzed, and an opening time for the wire harness is calculated. The opening time will determine if the wire harness is acceptable or unacceptable.

Claims

1. A computerized method for testing a wire harness assembly comprising the steps of:

converting an analog response characteristic of a wire harness assembly over a time interval to a digital data set;

selecting a first peak response value from said digital data set and marking a first time associated with said first peak response value;

selecting a first zero value from said digital data set and marking a second time associated with said first zero value; and

calculating an opening time by subtracting said second time from said first time;

indicating that the wire harness assembly is acceptable if the opening time is less than a critical time and that the wire harness assembly is unacceptable if the opening time is greater than the critical time.

2. The method of claim 1, wherein the method further comprises storing said digital data set.

3. The method of claim 1, wherein the method further comprises storing said opening time.

4. The method of claim 1, wherein the method further comprises the steps of:

graphing the response characteristic as a function of time, and

graphing the first digital data set as a function of time.

5. The method of claim 1 further including the steps of:

displaying an input to the wire harness as an input function of time;

displaying said response characteristic of the wire harness as a response function of time;

moving a first cursor along said input function;

moving a second cursor along said response function based upon said movement of said first cursor.

6. A computerized testing method for testing a wire harness assembly comprising the steps of:

converting an analog response characteristic of the wire harness assembly over a time interval to a digital data set;

storing said digital data set;

selecting a first peak response value from said digital data set and marking a first time associated with said first peak response value;

selecting a first zero value from said digital data set and marking a second time associated with said first zero value; and

calculating an opening time by subtracting said second time from said first time;

indicating that the wire harness assembly is operative if the opening time is less than a critical time and that the wire harness assembly is inoperative if the opening time is greater than the critical time.

7. The method of claim 6, wherein the method further comprises the steps of:

graphing the response characteristic as a function of time, and

graphing the first digital data set as a function of time.

8. The method of claim 6, wherein the method further comprises storing said opening time.

9. A computerized test system for testing a wire harness, said system comprising:

an input for receiving an analog response characteristic of a wire harness over a time interval;

a computer comprising

an analog-to-digital converter for converting said analog response characteristic to a digital data set;

a microprocessor programmed for selecting a first peak response value and a first zero value from said digital data set and calculating an opening time based on said values; and

a memory device being coupled to the microprocessor, said memory device for storing the opening time.

10. The system of claim 9, wherein the computer further includes a monitor for displaying a graphical user interface, said interface for receiving instructions and information relating to the wire harness and displaying said digital data set, the graphical user interface including:

a first window for receiving, viewing, and selecting at least one test parameter for the wire harness; and

a second window for initiating data sampling, data storing, data checking, and calculating results for the wire harness.

11. The graphical user interface of claim 10, wherein the first window further comprises a test setup section for entering a length of acquisition and a trigger current.

12. The graphical user interface of claim 10, wherein the second window further comprises a graphical display area for displaying graphs of the results.

13. The graphical user interface of claim 10, wherein the first window further comprises a test results section for displaying a plurality of calculated values.

14. The graphical user interface of claim 10, wherein the second window further comprises a test setup section for entering a length of acquisition and a trigger current.

15. The graphical user interface of claim 10, wherein the interface further comprises a third window for receiving and storing preexisting data on the design to be tested, said data being transferrable to the first window.

16. The graphical user interface of claim 12, wherein the second window further comprises a test setup section for entering a length of acquisition and a trigger current.

17. The graphical user interface of claim 11, wherein the first window further comprises a test results section for displaying a plurality of calculated values.

18. The system of claim 9 further including:

means for selecting a first peak response value from said digital data set and marking a first time associated with said first peak response value; and

means for selecting a first zero value from said digital data set and marking a second time associated with said first zero value, said microprocessor calculating said opening time based upon said first time and said second time.

19. The system of claim 9 further including:

a display displaying an input to the wire harness as an input function of time and displaying said response characteristic of the wire harness as a response function of time;

a user input device for moving a first cursor along said input function; and

means for moving a second cursor along said response function based upon said movement of said first cursor.