Method and device for changing over a first mode of a control device to a second mode, via a data bus

• US 20050093674A1
• Filed: 10/05/2004
• Published: 05/05/2005
• Est. Priority Date: 10/16/2003
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Wackerl, Oliver, Jordan, Ruediger
• Granted Patent: US 7,664,581 B2
• Time in Patent Office: Days
• US Class Current: 340/5.8
• CPC Class Codes: H04L 12/40006 Architecture of a communication node current supply arrangements H04L12/10; intermediate storage or scheduling H04L49/90
• CPC Class Codes: H04L 12/4135 using bit-wise arbitration
• CPC Class Codes: H04L 2012/40215 Controller Area Network CAN
• CPC Class Codes: H04L 2012/40273 the transportation system being a vehicle

Abstract

A method and a system for switching between a first operating mode and a second operating mode of a target control device connected to a data bus are provided. After activation of the target control device, a test device generates a predefined signal to be transmitted on the data bus, the predefined signal having a predefined frequency and a predefined pulse-duty factor. The target control device is switched from the first operating mode to the second operating mode in response to detecting the predefined signal transmitted on the data bus.

Claims

1. A method for switching between a first operating mode and a second operating mode of a target control device connected to a data bus, the method comprising:

activating the target control device;

generating, using a test device, a predefined signal to be transmitted on the data bus, the predefined signal having a predefined frequency and a predefined pulse-duty factor; and

switching from the first operating mode of the target control device to the second operating mode of the target control device in response to the target control device detecting the predefined signal transmitted on the data bus.

2. The method as recited in claim 1, wherein the switching occurs after the target control device detects the predefined signal during an initialization phase of the target control device.

3. The method as recited in claim 2, wherein the switching occurs within approximately one second after the target control device detects the predefined signal.

4. The method as recited in claim 2, further comprising:

performing a self-test by the target control device after the activation.

5. The method as recited in claim 1, further comprising:

performing an access-security authentication after the switching to the second operating mode;

wherein the second operating mode is a test mode for at least one of checking, programming and reprogramming the target control device, and wherein reprogramming of preset parameters of the target control device stored on a programmable memory is performed after a successful completion of the access-security authentication.

6. The method as recited in claim 5, wherein the access-security authentication includes a seed-and-key authentication.

7. The method as recited in claim 4, further comprising:

performing an access-security authentication after the switching to the second operating mode;

wherein the second operating mode is a test mode for at least one of checking, programming and reprogramming the target control device, and wherein reprogramming of preset parameters of the target control device stored on a programmable memory is performed after a successful completion of the access-security authentication.

8. The method as recited in claim 7, wherein the access-security authentication includes a seed-and-key authentication.

9. The method as recited in claim 1, wherein the predefined signal is changed if at least one other control device is active and coupled to the data bus, whereby the predefined signal is not detected by the target control device and the switching to the second operating mode of the target control device does not occur.

10. The method as recited in claim 5, wherein the predefined signal is changed if at least one other control device is active and coupled to the data bus, whereby the predefined signal is not detected by the target control device and the switching to the second operating mode of the target control device does not occur.

11. The method as recited in claim 7, wherein the predefined signal is changed if at least one other control device is active and coupled to the data bus, whereby the predefined signal is not detected by the target control device and the switching to the second operating mode of the target control device does not occur.

12. The method as recited in claim 5, wherein the data bus is a CAN bus.

13. The method as recited in claim 1, wherein the switching to the second operating mode occurs after at least 16 clock-pulse periods of the predefined signal.

14. The method as recited in claim 5, wherein the switching to the second operating mode occurs after at least 16 clock-pulse periods of the predefined signal.

15. The method as recited in claim 7, wherein the switching to the second operating mode occurs after at least 16 clock-pulse periods of the predefined signal.

16. The method as recited in claim 9, wherein the switching to the second operating mode occurs after at least 16 clock-pulse periods of the predefined signal.

17. The method as recited in claim 5, wherein the predefined signal is applied to the data bus by the testing device for a predefined period of time, and wherein the target control device is activated by a switching device associated with the testing device at the same time as the predefined signal is applied to the data bus.

18. The method as recited in claim 9, wherein the predefined signal is applied to the data bus by the testing device for a predefined period of time, and wherein the target control device is activated by a switching device associated with the testing device at the same time as the predefined signal is applied to the data bus.

19. A system for switching between a first operating mode and a second operating mode of a control device connected to a data bus, comprising:

a testing device having a switching device and a micro-controller, wherein the switching device activates the control device, and wherein the micro-controller outputs a predefined signal to the data bus, the predefined signal having a predefined frequency and a predefined pulse-duty factor, the micro-controller being connected to the switching device and the data bus; and

a data-processing device connected to the data bus, for activating the testing device and communicating with the control device via the data bus;

wherein the control device is switched from the first operating mode to the second operating mode in response to the control device detecting the predefined signal on the data bus.

20. The system as recited in claim 19, wherein the control device is a control unit of a motor vehicle, and wherein the control device has a supply-voltage terminal, a reference-potential terminal, a CAN-bus high terminal, and a CAN-bus low terminal.