Subscriber station for a serial bus system and method for communication in a serial bus system

Patent metadata

Field	Value
Publication number	US-12425265-B2
Application number	US-202418633586-A
Country	US
Kind code	B2
Filing date	Apr 12, 2024
Priority date	May 8, 2023
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

A subscriber station for a serial bus system. The subscriber station has a communication control device, and a re-integration module for re-integrating the communication control device into a communication on the bus to temporally synchronize the communication control device to a signal transmitted from the at least one other subscriber station of the bus system, which signal is created based on a frame for communication in the bus system. The re-integration module checks at least one predetermined re-integration condition to decide whether the operating mode of the communication control device is or is not to be switched into an operating mode for transmitting frames to the bus and/or for receiving frames from the bus, and uses in its check at least one predetermined re-integration condition having a sequence of bits in which the value of the last bit differs from that of the preceding bits.

First claim

What is claimed is:

1. A subscriber station for a serial bus system, comprising:
a communication control device configured to control a communication of the subscriber station with at least one other subscriber station of the bus system and to evaluate at least one signal received from a bus of the bus system, wherein in the at least one signal, a bit time in a first communication phase can differ from a bit time in a second communication phase; and
a re-integration module configured to re-integrate the communication control device into a communication on the bus to temporally synchronize the communication control device to a signal transmitted from the at least one other subscriber station of the bus system, which the signal is created based on a frame for communication in the bus system;
wherein the re-integration module is configured to check at least one predetermined re-integration condition in order to decide whether the operating mode of the communication control device is or is not to be switched into an operating mode for transmitting frames to the bus and/or receiving frames from the bus; and
wherein the re-integration module is configured to use in the check at least one predetermined re-integration condition having a sequence of bits in which a value of a last bit of the sequence differs from that of preceding bits of the sequence.

2. The subscriber station according to claim 1 , wherein the last bit of the at least one predetermined re-integration condition is a start bit of a next frame which the subscriber station receives from the bus.

3. The subscriber station according to claim 1 , wherein the re-integration module is configured to check, in addition to a first predetermined re-integration condition, a second predetermined re-integration condition for bits currently received from the bus to decide whether the operating mode of the communication control device is or is not to be switched into the operating mode for transmitting and/or receiving frames.

4. The subscriber station according to claim 3 , wherein the first predetermined re-integration condition has a predetermined number of consecutive bits that all have the same bit value, and wherein the second predetermined re-integration condition has a sequence of bits in which a logical value of a last bit of the sequence of bits differs from the logical value of preceding bits in the sequence of bits.

5. The subscriber station according to claim 4 , wherein the number of bits in the first and the second predetermined re-integration condition is the same.

6. The subscriber station according to claim 1 , wherein the communication control device is configured to synchronize to an edge during a re-integration of the re-integration module, the edge being an edge of a bit of the predetermined re-integration condition.

7. The subscriber station according to claim 4 , wherein the re-integration module is configured to evaluate an edge to which the communication control device is synchronized and which is present after a sample point of a 10th bit in the sequence of bits of the second predetermined re-integration condition as a beginning of a start bit of a next frame on the bus.

8. The subscriber station according to claim 7 , wherein the re-integration module is configured to, in an operating mode for re-integration, restart a search for the predetermined re-integration condition in the signal received from the bus every time the re-integration module has detected a falling edge in the signal received from the bus, wherein the edge is not evaluated by the re-integration module as a start of the start bit of the next frame on the bus.

9. The subscriber station according to claim 7 , wherein the re-integration module is configured to switch the communication control device after the edge into an operating mode for transmitting and receiving frames, and wherein the re-integration module is configured to instruct the communication control device to transmit without a start bit a frame to be transmitted and to begin transmission of the frame to be transmitted with a first bit of its identifier.

10. The subscriber station according to claim 7 , wherein the re-integration module is configured to switch the communication control device after the edge into an operating mode for only receiving frames when the communication control device currently does not have a frame to be transmitted.

11. The subscriber station according to claim 1 , wherein the re-integration module includes:
a detection block configured to detect a logical value of bits and a number of consecutive bits with the same logical value in the signal received from the bus;
an evaluation block configured to evaluate a detection result of the detection block based on the at least one re-integration condition; and
a mode switch block configured to switch the operating mode of the communication control device based on the evaluation performed by the evaluation block.

12. The subscriber station according to claim 1 , wherein the communication control device is configured to sample and evaluate the at least one signal received from the bus, the at least one signal being based on a transmission signal generated by another subscriber station, doing so according to a predetermined frame.

13. The subscriber station according to claim 1 , wherein the subscriber station is a Classical CAN subscriber station and/or a CAN FD subscriber station.

14. The subscriber station according to claim 1 , wherein the subscriber station is a CAN FD subscriber station and/or a CAN XL subscriber station.

15. The subscriber station according to claim 1 , wherein the communication control device is configured to, in the first communication phase, negotiate with other subscriber stations as to which of the subscriber stations of the bus system will be given at least temporarily exclusive, collision-free access to the bus in a subsequent second communication phase.

16. A bus system, comprising:
a bus; and
at least two subscriber stations which are connected to one another via the bus in such a way that they can communicate in series with one another and of which at least one subscriber station is a subscriber station including:
a communication control device configured to control a communication of the subscriber station with at least one other subscriber station of the bus system and to evaluate at least one signal received from a bus of the bus system, wherein in the at least one signal, a bit time in a first communication phase can differ from a bit time in a second communication phase, and
a re-integration module configured to re-integrate the communication control device into a communication on the bus to temporally synchronize the communication control device to a signal transmitted from the at least one other subscriber station of the bus system, which the signal is created based on a frame for communication in the bus system,
wherein the re-integration module is configured to check at least one predetermined re-integration condition in order to decide whether the operating mode of the communication control device is or is not to be switched into an operating mode for transmitting frames to the bus and/or receiving frames from the bus, and
wherein the re-integration module is configured to use in the check at least one predetermined re-integration condition having a sequence of bits in which a value of a last bit differs from that of preceding bits;

wherein each of the at least two subscriber stations also has a transmitting/receiving device for transmitting a transmission signal to the bus of the bus syst

Assignees

• Bosch Gmbh Robert

Inventors

• Mutter Arthur
• Hartwich Florian
• Bailer Franz

Classifications

• H04L12/40136

  Nodes adapting their rate to the physical link properties (LAN switches H04L49/351) · CPC title

• H04L2012/40215

  Controller Area Network CAN · CPC title

• H04L12/4013

  Management of data rate on the bus (systems modifying transmission characteristics according to link quality H04L1/0001) · CPC title

• H04L12/40013 Primary

  Details regarding a bus controller · CPC title

• H04L12/4035 Primary

  in which slots of a TDMA packet structure are assigned based on a contention resolution carried out at a master unit (TDM/TDMA multiplex systems per se H04J3/1694; hybrid switching systems H04L12/64) · CPC title