Automotive diagnostic communications

• US 5,646,865 A
• Filed: 10/27/1994
• Issued: 07/08/1997
• Est. Priority Date: 10/27/1994
• Status: Expired due to Term

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust)
• Inventors: Meister-Westermann, Jean Marie, Cicala, John Joseph, Alfaro, Enrique Jose
• Primary Examiner(s): Voeltz, Emanuel T.
• Assistant Examiner(s): COLE, TONY MITCHELL
• Application Number:
  US08/330,124
• Time in Patent Office: 985 Days
• Field of Search: 364/424.01, 364/424.03, 364/431.04, 364/431.12, 364/940.8, 364/942.06, 364/431.11, 364/222.2, 364/238, 364/238.2, 364/240.8, 364/514 R, 395/831, 395/285, 73/116, 73/117.2, 73/118.1, 324/402
• US Class Current: 701/29
• CPC Class Codes: G01R 31/007 using microprocessors or computers
• CPC Class Codes: G05B 19/048 Monitoring; Safety
• CPC Class Codes: G05B 2219/24048 Remote test, monitoring, diagnostic
• CPC Class Codes: G05B 2219/25117 Resistors, value, combination defines a digital value
• CPC Class Codes: G05B 2219/25178 Serial communication, data, also repeater
• CPC Class Codes: G05B 2219/25217 Configure communication protocol, select between several
• CPC Class Codes: G05B 2219/25275 Analog switch
• CPC Class Codes: G05B 2219/25296 Identification module, type connected I-O, device
• CPC Class Codes: G05B 2219/25435 Multiplex for analog signals
• CPC Class Codes: G05B 2219/2637 Vehicle, car, auto, wheelchair

Abstract

Automotive vehicle electronic devices are diagnosed through communication with a flexible diagnostic tool which automatically switches between a wide variety of communications protocols as required for diagnostic communication tasks presented to the tool. Simultaneous communication with a plurality of devices under a plurality of communications protocols is supported by the tool wherein communication hardware is available for parallel communications under the various protocols via various communication channels and is apportioned for each active diagnostic communication task for the duration of that task.

Claims

1. A method of diagnosing automotive vehicle electronic devices in which a diagnostic tool supports diagnostic communications under a predetermined plurality of diagnostic communication protocols, comprising the steps of:

interfacing the diagnostic tool with an automotive vehicle having a plurality of electronic devices;

indicating when diagnostic communications with at least one of the plurality of electronic devices is to be provided;

determining the communication protocols under which at least one of the plurality of electronic devices communicates; and

providing diagnostic communications with at least one of the plurality of electronic devices under the determined communication protocols.

2. The method of claim 1, further comprising the steps of:

reserving diagnostic tool hardware for communicating under the determined communication protocols; and

activating the reserved diagnostic tool hardware;

and wherein the providing step provides diagnostic communications with at least one of the plurality of electronic devices via the activated reserved diagnostic tool hardware.

3. The method of claim 2, further comprising the steps of:

detecting when diagnostic communications with at least one of the plurality of electronic devices are complete; and

de-activating the reserved diagnostic tool hardware upon detecting when the diagnostic communications are complete.

4. The method of claim 2, further comprising the steps of:

indicating when additional diagnostic communications with additional electronic devices is to be provided;

determining the additional communication protocols under which the additional electronic devices communicate;

referencing the diagnostic tool hardware required for diagnostic communications under the determined additional communication protocols; and

if the referenced diagnostic tool hardware has not been reserved, then providing diagnostic communications with the additional electronic devices via the referenced diagnostic tool hardware.

5. The method of claim 1, wherein each of the automotive vehicle electronic devices communicates via a serial communication channel and the diagnostic tool receives diagnostic communications via a diagnostic communications connector, the interfacing step further comprising the steps of:

providing a communications connection between the serial communications channel of each of the plurality of electronic devices and the diagnostic communications connector; and

receiving information identifying the automotive vehicle and the plurality of electronic devices upon providing the communications connection.

6. The method of claim 1, further comprising the steps of:

determining diagnostic tool encoding hardware for encoding diagnostic communications into the determined communication protocols;

determining diagnostic tool decoding hardware for decoding diagnostic communications from the determined communication protocols; and

activating the determined diagnostic tool encoding and decoding hardware.

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

when diagnostic communications are to be output to an electronic device included within at least one of the plurality of electronic devices, applying the diagnostic communications that are to be output to the activated encoding hardware corresponding to the electronic device to encode the communications into the corresponding communications protocol; and

transmitting the encoded communications to the electronic device.

8. The method of claim 6, further comprising the steps of:

when diagnostic communications are to be input from an electronic device included within at least one of the plurality of electronic devices, receiving the diagnostic communications from the electronic device; and

applying the received diagnostic communications to activated decoding hardware corresponding to the electronic device to decode the communications from the corresponding communications protocol.

9. A diagnostic method for providing diagnostic communications between a diagnostic tool and automotive vehicle electronic devices under a predetermined plurality of diagnostic communication protocols, comprising the steps of:

providing input signal information to the diagnostic tool identifying the electronic devices to be diagnosed;

identifying when diagnostic communications with one of the identified electronic devices is to occur;

referencing a diagnostic communications protocol under which the one of the identified electronic devices transmits and receives diagnostic communications;

identifying diagnostic tool hardware for communicating under the referenced diagnostic communications protocol; and

activating the identified diagnostic tool hardware to provide for diagnostic communications with the one of the identified electronic devices.

10. The method of claim 9, further comprising the steps of:

determining when diagnostic communications with the one of the identified electronic devices is complete; and

de-activating the identified diagnostic tool hardware upon determining that the diagnostic communications are complete.

11. The method of claim 9, further comprising the steps of:

while the identified diagnostic tool hardware is activated, determining when diagnostic communications with an additional one of the identified electronic devices is to occur;

referencing an additional diagnostic communications protocol under which the additional one of the identified electronic devices transmits and receives diagnostic communications;

identifying the additional diagnostic tool hardware for communicating under the additional diagnostic communications protocol;

determining if the identified additional diagnostic tool hardware is activated; and

if the identified additional diagnostic tool hardware is not activated, then activating the identified additional diagnostic tool hardware to provide for diagnostic communications with the additional one of the identified electronic devices.

12. The method of claim 11, further comprising the steps of:

if the identified additional diagnostic tool hardware is activated, then sensing de-activation of the identified additional diagnostic tool hardware; and

upon sensing the de-activation, reactivating the identified additional diagnostic tool hardware to provide for diagnostic communications with the additional one of the identified electronic devices.