Automotive diagnostic communications interface

• US 5,491,418 A
• Filed: 10/27/1994
• Issued: 02/13/1996
• Est. Priority Date: 10/27/1994
• Status: Expired due to Fees

• Current Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust)
• Original Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust)
• Inventors: Frank, Erwin, Alfaro, Enrique J.
• Primary Examiner(s): Regan, Maura K.
• Assistant Examiner(s): BROWN, GLENN WARNER
• Application Number:
  US08/330,539
• Time in Patent Office: 474 Days
• Field of Search: 324/378, 324/402, 324/691, 307/9.1, 307/10.1, 307/10.5, 439/34, 439/620, 439/634, 340/825.07, 340/438, 364/424.03
• US Class Current: 324/402
• CPC Class Codes: G01R 31/007 using microprocessors or computers
• CPC Class Codes: Y10S 439/955 including electronic identifier or coding means

Abstract

A diagnostic tool having a communications interface adapter for flexible diagnostic communications with automotive vehicle electronic devices automatically identifies, when connected to the adapter, the vehicle type associated with the adapter, and automatically establishes from stored communications information, the diagnostic communications format under which the electronic devices associated with the identified vehicle type communicate. Diagnostic tool communications hardware is then automatically initialized to prepare for diagnostic communications with minimum operator intervention.

Claims

1. An automotive vehicle diagnostic communications interface method for interfacing a diagnostic tool having a tool connector with an automotive vehicle having a vehicle connector to provide for diagnostic communications between the diagnostic tool and electronic devices on-board the automotive vehicle, comprising the steps of:

establishing a schedule of predetermined diagnostic communication configurations having a plurality of elements each of the plurality of elements of the schedule corresponding to one of a plurality of automotive vehicle diagnostic classifications;

providing a connector adapter for each of the plurality as the connector adapter that is used as a diagnostic communications interface therewith;

selecting a connector adapter from the provided connector adapters as the connector adapter providing a diagnostic communications interface between the tool connector and the vehicle connector;

applying the selected connector adapter to the tool connector; and

activating the diagnostic tool whereby the diagnostic tool automatically establishes communications with the vehicle electronic devices via the applied connector adapter, by (a) detecting which connector adapter from the provided connector adapters has been applied to the diagnostic tool, (b) referencing the diagnostic communications configuration corresponding to the vehicle diagnostic classification for which the detected connector adapter has been applied, (c) configuring the diagnostic tool in accord with the referenced diagnostic communications configuration, and (d) providing diagnostic communications with the vehicle electronic devices under the diagnostic tool configuration.

2. The method of claim 1, wherein each of the predetermined set of connector adapters includes an electrical device having an electrically measurable value and wherein the value of each of the electrical devices is distinguishable from the values of the others of the electrical devices, the detecting step further comprising the steps of:

measuring the value of the electrical device included in the selected connector adapter after the selected connector adapter has been applied to the diagnostic tool; and

determining the applied connector adapter as the connector adapter including a device with a value substantially corresponding to the measured value.

3. An automotive vehicle diagnostic communications interface across which a diagnostic tool having a tool connector communicates with electronic devices of a predetermined plurality of automotive vehicle classes, wherein each of the predetermined plurality is characterized by a particular vehicle diagnostic connector, comprising:

a plurality of connector adapters each of which plurality is particular to a one of the plurality of automotive vehicle classes for providing a diagnostic communication connection between the particular vehicle diagnostic connector characteristic of such class and the tool connector;

sensing circuitry included with the diagnostic tool for sensing, when the diagnostic communication connection has been provided, the connector adapter providing the diagnostic communication connection; and

a controller included with the diagnostic tool responsive to the sensed connector adapter for identifying the one of the predetermined plurality of automotive vehicle classes to which the sensed connector adapter is particular.

4. The interface of claim 3, wherein each of the predetermined plurality of automotive vehicle classes carries out diagnostic communications according to a distinct communication format, the automotive vehicle diagnostic communications interface further comprising:

communications configuration circuitry for establishing, upon identifying the one of the predetermined plurality of automotive vehicle classes, diagnostic communications under the communication format of the identified one of the predetermined plurality of automotive vehicle classes.

5. The interface of claim 3, wherein each of the connector adapters further comprises:

an electrical element having a predetermined measurable value particular to its corresponding connector adapter;

and wherein the sensing circuitry senses the connector adapter by measuring the value of the electrical element particular to the connector adapter providing the diagnostic communication connection.

6. The interface of claim 5, wherein the electrical element is an electrical resistor embedded in the connector adapter.

7. An apparatus for identifying automotive vehicle electronic devices to be diagnosed by a diagnostic tool having a tool connector for diagnostic communications, comprising:

a vehicle connector for diagnostic communications with the automotive vehicle electronic devices;

a connector adapter for adapting the tool connector to the vehicle connector to provide for diagnostic communications between the automotive vehicle electronic devices and the diagnostic tool;

an electrical element having a predetermined, electrically measurable value for identifying the automotive vehicle electronic devices, the electrical element disposed on the connector adapter;

the diagnostic tool having measuring circuitry for measuring the predetermined, electrically measurable value of the electrical element when the connector adapter is connected to the diagnostic tool;

a stored schedule of electronic device identification information sets, each set paired with an electrical element value; and

a controller for referencing the electronic device identification information set corresponding to the measured electrical element value to identify the automotive vehicle electronic devices.

8. The apparatus of claim 7, wherein, upon identifying the automotive vehicle electronic devices, the controller configures the diagnostic tool for diagnostic communications with the identified automotive vehicle electronic devices.

9. The apparatus of claim 7, wherein the electrical element is an electrical resistor.

10. The apparatus of claim 7, wherein the connector adapter further comprises:

a front connector portion sized for mechanical attachment to the vehicle connector; and

a rear connector portion sized for mechanical attachment to the diagnostic tool connector.

11. The apparatus of claim 10, wherein the electrical element has upper and lower electrical connection terminals, and wherein the connector adapter further comprises:

electrical conductors for conducting electrical signals between the front and rear connector portions to provide for diagnostic communications between the diagnostic tool and the automotive vehicle electronic devices;

an upper conductor for conducting electrical signals between the rear connector portion and the upper connection terminal;

a lower conductor for conducting electrical signals between the rear connector portion and the lower connection terminal;

and wherein when the rear connector portion is mechanically attached to the diagnostic tool connector the measuring circuitry is electrically connected to the upper and low conductors for measurement of the electrical element value.