Method and device for waking users of a bus system, and corresponding users

• US 8,514,065 B2
• Filed: 01/06/2011
• Issued: 08/20/2013
• Est. Priority Date: 12/30/2002
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Huebl, Jochen
• Primary Examiner(s): BROWN, VERNAL U
• Application Number:
  US12/985,448
• Publication Number:
  US 20110107130A1
• Time in Patent Office: 957 Days
• Field of Search: 713/324, 701/36, 340/12.31, 340/426.16, 340/426.25, 340/533
• US Class Current: 340/533
• CPC Class Codes: G05B 2219/25286 Switch on power, awake controlled machine from standby if command signal
• CPC Class Codes: H04L 12/40039 Details regarding the setting of the power status of a node according to activity on the bus
• CPC Class Codes: H04L 2012/40215 Controller Area Network CAN
• CPC Class Codes: H04L 2012/40273 the transportation system being a vehicle

Abstract

A device for waking up users of a bus system includes an evaluator having at least one clock-pulse generator and configured to selectively evaluate the wake-up information used to activate the users. The wake-up information to be evaluated has the structure of a standard CAN message. The activating procedure is initiated only in response to the presence of wake-up information that is specified for the respective user.

Claims

1. A device for connecting a user station to a CAN bus, the user station being able to be activated by the device in response to receiving wake-up information, comprising:

an evaluator including at least one clock-pulse generator and configured to selectively evaluate the wake-up information detected on the CAN bus;

wherein the wake-up information to be evaluated has the structure of a standard CAN message, and wherein activation of a respective user station is initiated only in response to the presence of wake-up information detected on the CAN bus, wherein the wake-up information is one of specified or specifiable for the respective user station, and

wherein the evaluation of the wake-up information includes an evaluation of at least one part of one of the data field or the data length code of one of messages present on the CAN bus or potential wake-up messages preselected from the messages present on the CAN bus.

2. The device as recited in claim 1, wherein the evaluation of the wake-up information includes reading out one of a unit number, a group of units, or a unit-specific identifier from the data field and comparing to a corresponding one of a unit number, a group of units, or a unit-specific identifier stored in the respective user station.

3. The device as recited in claim 1, wherein the preselection of the potential wake-up messages from the messages present on the CAN bus takes place with the aid of at least a part of the identifier of the messages present on the CAN bus.

4. The device as recited in claim 1, wherein the evaluation of the wake-up information includes an evaluation of at least one part of the identifier of one of CAN messages present on the CAN bus or potential wake-up messages preselected from the CAN messages present on the CAN bus.

5. The device as recited in claim 4, wherein the preselection of the potential wake-up messages from the CAN messages present on the CAN bus takes place with the aid of at least one part of one of the data field or the data length code of the CAN messages present on the CAN bus.

6. The method as recited in claim 1, wherein the evaluation of the wake-up information includes reading out one of a unit number, a group of units, or a unit-specific identifier from the data field and comparing to a corresponding one of a unit number, a group of units, or a unit-specific identifier stored in the respective user station.

7. The method as recited in claim 1, wherein the preselection of the potential wake-up messages from the messages present on the CAN bus takes place with the aid of at least a part of the identifier of the messages present on the CAN bus.

8. The device as recited in claim 1, wherein a counter which counts at least one predefined signal feature of at least one signal transmitted on the CAN bus and initiates a further wake-up procedure once a preselectable number has been reached.

9. The device as recited in claim 8, wherein an edge or an edge change of the signal is provided as the preselected signal feature.

10. The device as recited in claim 8, wherein a signal level or a certain combination of several signal levels is provided as the preselected signal feature.

11. The device as recited in claim 8, wherein a time duration is determined in response to the first occurrence of the signal feature and binary information results that allows a selective wake-up of users of the bus system.

12. The device as recited in claim 1, wherein at least one control device connected to the bus may thus shut off their micro-controllers altogether or bring them into a sleep mode with a likewise switched-off clock generator;

only a one transceiver connected to the bus must be supplied with stand-by power.

13. The device as recited in claim 12, wherein the one transceiver is a CAN transceiver having minimal power consumption.

14. The device as received in claim 1, wherein a time duration of the at least one clock-pulse generator is independent of the utilized transmission rate of the bus system.

15. A method for selectively activating user stations on a CAN bus in response to receiving wake-up information, the method comprising:

evaluating, using an evaluator including at least one clock-pulse generator, the wake-up information detected on the CAN bus, wherein the wake-up information to be evaluated has the structure of a standard CAN message; and

initiating activation of a respective user station only in response to the presence of wake-up information detected on the CAN bus, wherein the wake-up information is one of specified or specifiable for the respective user station; and

wherein the evaluation of the wake-up information includes an evaluation of at least one part of one of the data field or the data length code of one of messages present on the CAN bus or potential wake-up messages preselected from the messages present on the CAN bus.

16. The method as recited in claim 15, wherein the evaluation of the wake-up information includes an evaluation of at least one part of the identifier of one of CAN messages present on the CAN bus or potential wake-up messages preselected from the CAN messages present on the CAN bus.

17. The method as recited in claim 16, wherein the preselection of the potential wake-up messages from the CAN messages present on the CAN bus takes place with the aid of at least one part of one of the data field or the data length code of the CAN messages present on the CAN bus.

18. The method as recited in claim 15, wherein a counter which counts at least one predefined signal feature of at least one signal transmitted on the CAN bus and initiates a further wake-up procedure once a preselectable number has been reached.

19. The method as recited in claim 18, wherein an edge or an edge change of the signal is provided as the preselected signal feature.

20. The method as recited in claim 18, wherein a signal level or a certain combination of several signal levels is provided as the preselected signal feature.

21. The method as recited in claim 18, wherein a time duration is determined in response to the first occurrence of the signal feature and binary information results that allows a selective wake-up of users of the bus system.

22. The method as recited in claim 15, wherein at least one control device connected to the bus may thus shut off their micro-controllers altogether or bring them into a sleep mode with a likewise switched-off clock generator;

only a one transceiver connected to the bus must be supplied with stand-by power.

23. The method as received in claim 15, wherein a time duration of the at least one clock-pulse generator is independent of the utilized transmission rate of the bus system.

24. The method as recited in claim 23, wherein the one transceiver is a CAN transceiver having minimal power consumption.

25. A user station connected to a CAN bus and configured to be activated by wake-up information transmitted on the CAN bus, comprising:

an evaluator including at least one clock-pulse generator and configured to selectively evaluate the wake-up information detected on the CAN bus;

wherein the wake-up information to be evaluated has the structure of a standard CAN message, and wherein activation of a respective user station is initiated only in response to the presence of wake-up information detected on the CAN bus, wherein the wake-up information is one of specified or specifiable for the respective user station, and

wherein the evaluation of the wake-up information includes an evaluation of at least one part of one of the data field or the data length code of one of messages present on the CAN bus or potential wake-up messages preselected from the messages present on the CAN bus.