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Subscriber station for a serial bus system and method for sending messages in a serial bus system

A technology of serial bus and bus system, which is applied in the field of user stations for serial bus systems and for sending messages in serial bus systems, can solve the problem of low effective data length up to 64 bytes, and achieve large Effects of robustness against errors, reduced material usage, and reduced wiring costs

Active Publication Date: 2022-02-22
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the effective data lengths of up to 64 bytes achieved hitherto with CAN FD are too low for some applications

Method used

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  • Subscriber station for a serial bus system and method for sending messages in a serial bus system
  • Subscriber station for a serial bus system and method for sending messages in a serial bus system
  • Subscriber station for a serial bus system and method for sending messages in a serial bus system

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Embodiment Construction

[0038] figure 1As an example, a bus system 1 is shown, which is essentially designed, in particular, for a CAN bus system, a CAN FD bus system, a CAN EL bus system and / or variants thereof, as will be described below. The bus system 1 can be used in vehicles, in particular motor vehicles, aircraft or the like, or in hospitals or the like.

[0039] exist figure 1 In this case, the bus system 1 has, in particular, parallel bus lines 3 to which a plurality of subscriber stations 10 , 20 , 30 are connected. The messages 4 , 5 can be transmitted serially in the form of signals between the individual subscriber stations 10 , 20 , 30 via the bus line 3 . The subscriber stations 10 , 20 , 30 are, for example, control devices, sensors, display devices, etc. of the motor vehicle.

[0040] as in figure 1 As shown in , the subscriber station 10 has a communication control device 11 and a transmitting / receiving device 12 . On the other hand, the subscriber station 20 has a communicatio...

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Abstract

A subscriber station (20; 30) for a bus system (1) and a method for sending messages at different bit rates in the bus system (1) are provided. The subscriber station (20; 30) comprises a sending stage (2200) for sending a message (4; 5) to the bus line (3) of the bus system (1), wherein the sending stage (2200) has a An output stage (225, 226, 2270, 2280) for switching a differential bus signal between a high bus state (461; 462) and a low bus state (471) for a message (5), wherein the transmit stage (2200) is configured such that for at least a first phase for transmitting the data of the message (5), the differential bus signals (CAN_EL_H2; CAN_EL_L2) have the same level for the low bus state (471) and drive all said low bus state (471), and wherein said sending stage (2200) is structured such that for a second stage (453; 454; 455) for transmitting data of said message (5), the same as said high bus A state (462) similar to the bus state (461) has a differential voltage between the differential bus signals (CAN_EL_H1; CAN_EL_L1) compared to the differential voltage between the differential bus signals (CAN_EL_H1; CAN_EL_L1) in the high bus state (462) The smaller differential voltage between.

Description

technical field [0001] The invention relates to a subscriber station for a serial bus system and a method for transmitting messages in a serial bus system which operates with a high data rate and a high error robustness. Background technique [0002] In vehicles, for example, bus systems are often used for communication between sensors and control units, in which data are transmitted as messages as standard ISO 11898-1:2015 with the CAN protocol specification of CAN FD. Messages are transmitted between bus users of the bus system, such as sensors, control devices, transmitters (Gebers), etc. [0003] As the number of functions of technical devices or vehicles increases, so does the data communication in the bus system. For this purpose it is often also required that the data be transmitted from the sender to the receiver faster than before. As a result, the required bandwidth of the bus system is further increased. [0004] In order to be able to transmit data at a higher...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/413
CPCH04L12/4135H04L12/4013H04L2012/40215
Inventor S·沃克尔
Owner ROBERT BOSCH GMBH
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