Distributed control system

• US 20060259231A1
• Filed: 05/15/2006
• Published: 11/16/2006
• Est. Priority Date: 05/13/2005
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Hayashi, Shinichi, Nakano, Takashi, Ichikawa, Takahiro
• Granted Patent: US 7,260,733 B2
• Time in Patent Office: Days
• US Class Current: 701/115
• CPC Class Codes: G05B 19/4148 characterised by using several processors for different functions, distributed (real-time) systems G05B19/4141 takes precedence
• CPC Class Codes: G05B 2219/33278 Cooperation between autonomous modules by receipts, messages, no synchronisation
• CPC Class Codes: G05B 2219/34413 Add time stamp to command message
• CPC Class Codes: H04J 3/0638 Clock or time synchronisation among nodes; Internode synchronisation synchronization for ring networks H04L12/422; data switching networks with synchronous transmission H04L12/43
• CPC Class Codes: H04L 7/10 Arrangements for initial synchronisation

Abstract

In a distributed control system, a first electronic control unit sends trigger information to a second electronic control unit. The trigger information includes a timing that triggers the second electronic unit to obtain second sensor information from a second sensor. The second electronic control unit is designed to receive the trigger information, and obtain, at the timing of the trigger information, the second sensor information from the second sensor. The second electronic unit is configured to send, to the first electronic control unit, the obtained second sensor information.

Claims

1. A distributed control system comprising:

a first electronic control unit connected to a first sensor and configured to obtain first sensor information therefrom for execution of allocated control; and

a second electronic control unit connected to a second sensor and configured to obtain second sensor information therefrom for execution of allocated control, the first and second electronic control units being communicably linked to each other,

the first electronic control unit being configured to send trigger information to the second electronic control unit, the trigger information including a timing that triggers the second electronic unit to obtain the second sensor information from the second sensor,

the second electronic control unit being configured to;

receive the trigger information;

obtain, at the timing of the trigger information, the second sensor information from the second sensor; and

send, to the first electronic control unit, the obtained second sensor information.

2. A distributed control system according to claim 1, wherein the timing of the trigger information is configured to trigger the first electronic control unit to obtain the first sensor information.

3. A distributed control system according to claim 1, wherein the timing included in the trigger information represents a predetermined cycle, and the second electronic control unit is configured to:

obtain a piece of the second sensor information from the second sensor every predetermined cycle; and

send, to the first electronic control unit, the obtained pieces of the second sensor information together with timing identifiers, the timing identifiers temporally identifying the pieces of the second sensor information, respectively.

4. A distributed control system according to claim 3, wherein the first electronic control unit is configured to:

obtain a piece of the first sensor information from the first sensor every predetermined cycle;

obtain timing identifiers temporally identifying the pieces of the first sensor information, respectively;

receive the pieces of the second information together with the timing identifiers, respectively; and

store the pieces of the first information and those of the second information such that the pieces of the first information are associated with those of the second information based on the timing identifiers of the pieces of the first information and those of the pieces of the second information.

5. A distributed control system according to claim 1, wherein the trigger information includes a predetermined obtaining number, and the second electronic control unit is configured to:

obtain a number of pieces of the second sensor information from the second sensor according to the timing, the number of pieces of the second sensor information corresponding to the obtaining number; and

send, to the first electronic control unit, a series of the obtained pieces of the second sensor information together with timing identifiers, the timing identifiers temporally identifying the pieces of the second sensor information, respectively.

6. A distributed control system according to claim 5, wherein the first electronic control unit is configured to:

obtain a number of pieces of the first sensor information from the first sensor according to the timing, the number of pieces of the first sensor information corresponding to the obtaining number;

obtain timing identifiers temporally identifying the pieces of the first sensor information, respectively;

receive the series of the obtained pieces of the second information together with the timing identifiers, respectively; and

store a series of the obtained pieces of the first information and that of the obtained pieces of the second information such that the pieces of the first information are associated with those of the second information based on the timing identifiers of the pieces of the first information and those of the pieces of the second information.

7. A distributed control system according to claim 1, wherein the first electronic control unit is configured to periodically send the trigger information to the second electronic control unit.

8. A distributed control system according to claim 1, wherein the first electronic control unit is configured to non-periodically send the trigger information to the second electronic control unit.

9. A distributed control system according to claim 1, wherein the first and second electronic control units are communicably linked to each other via a CAN bus such that the trigger information is sent from the first electronic control unit to the second electronic control unit via the CAN bus as a CAN message.

10. A distributed control system according to claim 1, wherein the distributed control system is installed in a vehicle, the first sensor is an intake throttle-position sensor configured to monitor information representing throttle position of an intake throttle of an engine installed in the vehicle, and the second sensor is an intake stroke sensor configured to monitor stroke volume of an intake valve installed in the vehicle.

11. A distributed control system comprising:

a first electronic control unit connected to a first sensor and configured to obtain first sensor information therefrom for execution of allocated control;

a second electronic control unit connected to a second sensor and configured to obtain second sensor information therefrom for execution of allocated control; and

a third electronic control unit for managing timings between the first and second electronic control units, the first, second and third electronic control units being communicably linked to each other,

the third electronic control unit being configured to send trigger information to each of the first and second electronic control units, the trigger information including a timing that triggers the first electronic unit to obtain the first sensor information from the first sensor and that triggers the second electronic unit to obtain the second sensor information from the second sensor,

the first electronic control unit being configured to;

receive the trigger information; and

obtain, at the timing of the trigger information, the first sensor information from the first sensor,

the second electronic control unit being configured to;

receive the trigger information; and

obtain, at the timing of the trigger information, the second sensor information from the second sensor.

12. A distributed control system according to claim 11, wherein the trigger information includes destination information indicative of at least one of the first to third electronic control unit as destination of each of the first and second sensor information, and each of the first and second electronic control unit is configured to send the obtained first sensor information and the second sensor information to at least one of the first to third electronic control units except for itself, the at least one of the first to third electronic control unit being indicated by the destination information.

13. A distributed control system according to claim 12, wherein the destination information is indicative of the first electronic control unit as destination of the second sensor information.

14. A distributed control system according to claim 13, wherein the timing included in the trigger information represents a predetermined cycle, the first electronic control unit is configured to obtain a piece of the first sensor information from the first sensor every predetermined cycle, and the second electronic control unit is configured to:

obtain a piece of the second sensor information from the second sensor every predetermined cycle;

obtain a piece of the second sensor information from the second sensor every predetermined cycle; and

send, to the first electronic control unit, the obtained pieces of the second sensor information together with timing identifiers, the timing identifiers temporally identifying the pieces of the second sensor information, respectively.

15. A distributed control system according to claim 13, wherein the trigger information includes a predetermined obtaining number, the first electronic control unit is configured to obtain a number of pieces of the first sensor information from the first sensor according to the timing, the number of pieces of the first sensor information corresponding to the obtaining number, and the second electronic control unit is configured to:

obtain a number of pieces of the second sensor information from the second sensor according to the timing, the number of pieces of the second sensor information corresponding to the obtaining number; and

send, to the first electronic control unit, a series of the obtained pieces of the second sensor information together with timing identifiers, the timing identifiers temporally identifying the pieces of the second sensor information, respectively.

16. A distributed control system according to claim 11, wherein the third electronic control unit is configured to periodically send the trigger information to each of the fist and second electronic control units.

17. A distributed control system according to claim 11, wherein the third electronic control unit is configured to non-periodically send the trigger information to each of the first and second electronic control units.

18. A distributed control system according to claim 11, wherein the first, second and third electronic control units are communicably linked to each other via a CAN bus such that the trigger information is sent from the third electronic control unit to each of the first and second electronic control units via the CAN bus as a CAN message.

19. A distributed control system according to claim 11, wherein the distributed control system is installed in a vehicle, the first sensor is an intake throttle-position sensor configured to monitor information representing throttle position of an intake throttle of an engine installed in the vehicle, and the second sensor is an intake stroke sensor configured to monitor stroke volume of an intake valve installed in the vehicle.