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Controller area network active bus terminator

A technology of local area network bus and controller, applied in the direction of connection, bus network, components of connecting device, etc., can solve the problems of high cost and complicated device

Active Publication Date: 2011-08-17
CATERPILLAR TRIMBLE CONTROL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The difficulty with these termination methods is that they rely on the user to remember to properly terminate the controller area network bus
Although several automatic termination devices have been developed, these are often too complex and expensive

Method used

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  • Controller area network active bus terminator
  • Controller area network active bus terminator
  • Controller area network active bus terminator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] figure 1 is a schematic diagram of a typical Controller Area Network bus. As vehicles become more complex and incorporate more electronic components, it is desirable to be able to connect these components together in a way that allows them to communicate with each other. The Controller Area Network (CAN) bus 10 was developed to meet this need. The bus comprises a two-wire arrangement for transferring data between devices 12 , 14 , 16 and 18 . Although only four devices are shown in the diagram, a typical application may include dozens of these devices, perhaps even more. Data rates on the controller area network bus can range from less than 10,000 bits / second to 1,000,000 bits / second, with the most common data transfer speed being about 250,000 bits / second. It will be appreciated that as the data transmission rate over a pair of wires increases, electrical transmission line effects can become significant. To ameliorate these effects, the two wires carrying the data ...

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PUM

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Abstract

A terminator for a CAN bus includes an electronic relay and a termination impedance. The electronic relay has first and second control input conductors and switched output conductors. The electrical connection between the switched output conductors is normally closed. The first control input conductor is connected to the power conductor and the second control input conductor is connected to a fifth terminal of the first CAN bus connector. The termination impedance is connected in series at the end node of the CAN bus with the switched output conductors across the high data conductor and the low data conductor. By this arrangement, the termination impedance is effectively connected across the high data conductor and the low data conductor at the end node of the CAN bus until an extension of the CAN bus is plugged into the first CAN bus connector. When an extension of the CAN bus is plugged into the first CAN bus connector, the fifth terminal of the CAN bus connector is connected to the ground conductor. This actuates the relay and opens the switched output conductors.

Description

[0001] Not applicable. technical field [0002] The present application relates to a terminal connector, in particular to a terminal connector for a controller area network active bus. Background technique [0003] The Controller Area Network (CAN) bus format was originally developed to allow multiple independent electronic devices in a vehicle, such as an automobile, to communicate over a single data bus. Data is transferred between the various devices over the controller area network bus, each device is connected to a node on the bus, and each data message has an identifier specifying the device to which the message is to be directed. Since the controller area network bus was introduced in the 1980s, its use has spread beyond automobiles to many machine and industrial applications, and many variations of the controller area network bus format have been adopted. In all of these variants, however, data is transmitted over a single terminated twisted pair cable at high frequ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01R13/66H01R13/70H04L12/40
CPCG06F13/4086
Inventor J·W·约斯特
Owner CATERPILLAR TRIMBLE CONTROL TECH