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Communication network system

A communication network and communication line technology, applied in the field of communication network systems, can solve problems such as inflexibility

Inactive Publication Date: 2013-01-02
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the management node that controls the wakeup of other nodes is limited to one node
Therefore, this control scheme of JP '314 is not flexible

Method used

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Examples

Experimental program
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no. 1 example ）

[0053] refer to Figure 1 to Figure 6 A first embodiment of the present invention will be described. see Figure 6 , the communication network system includes a communication bus 1 (ie, a communication line) and nodes 2A (ie, node A), 2B (ie, node B), and 2C (ie, node C) connected thereto. In the following, nodes 2A, 2B, 2C may be referred to as node 2 . Each of the nodes 2A, 2B, 2C is switchable such that the nodes 2A, 2B, 2C can be switched between two modes of operation, such as a normal mode / state of operation (i.e. active mode or active state) and Low power mode / state (i.e. sleep mode or sleep state). In the normal operation mode, each of the nodes 2A, 2B, 2C is controlled in an integral manner such that the control circuit of each of the nodes 2A, 2B, 2C ( Figure 4 ) has a clock signal provided to it for its operation. The control circuit 7 of each node 2A, 2B, 2C may be in the form of a CPU or a microcomputer. In the low power consumption mode, the operation of t...

no. 2 example ）

[0075] Figure 7 to Figure 10 A second embodiment is shown, in which the description focuses on the differences from the first embodiment. In addition, the same parts have the same reference numerals, and descriptions of these same parts are omitted. refer to Figure 7 , the receiving unit 2Ra of the second embodiment includes a threshold setting register 8a, wherein the register value of the threshold setting register 8a can be changed by the control circuit 7a. When the control circuit 7a receives a threshold change command from the node 2 from the transmission side (ie, the transmission unit 2T), it writes the setting data added to the command into the threshold setting register 8a, and changes the threshold value change command in the squelch circuit 4 Schmitt trigger circuit 19 threshold. The remaining configuration of the configuration of the receiving unit 2Ra is the same as that of the first embodiment.

[0076] refer to Figure 8 to Figure 10 Advantageous effects...

no. 3 example ）

[0086] refer to Figure 11 The third embodiment will be described, focusing on the differences from the second embodiment. The third embodiment describes the case where the threshold change of the squelch circuit 4 of the node 2B on the receiving side is performed based on the threshold change command sent by the node 2C. Node 2C starts up and communicates with nodes 2A and 2B, and after sending a threshold change command to node 2B, node 2C sends a sleep command. When the node 2B receives a threshold change command, the control circuit 7a of the node 2B rewrites the register value of the threshold setting register 8a of the node 2B according to the value specified by the command. Then, just like the second embodiment, by receiving the sleep command, the node 2B transitions to the sleep mode (see Figure 11 (1)-(8)).

[0087] As described above, since the change of the threshold value in the third embodiment is performed according to the change command sent by the node 2C o...

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Abstract

A communication network system including a plurality of nodes (2) disposed on a communication bus (1), and where each of the nodes (2) is capable of transitioning between a normal operation mode and a low electricity consumption mode. The communication network system controls only a required node, in order to communicate with such required node, by transitioning the required node from the low power mode to the normal operation mode. To control the mode of the required nodes, a controlling node keeps a signal change state of the communication bus (1) for a period that is longer than a normal communication frame length. The required node determines whether the period of the signal change state is longer than a threshold of the required node itself, to output a wakeup signal to a control circuit (7).

Description

technical field [0001] In general terms, the present disclosure relates to a communication network system having a plurality of nodes connected to a communication line, respectively switching between a normal operation mode and a low power consumption mode. Background technique [0002] Each communication node, such as an electronic control unit (ECU), is configured to transition, for example, into the on-vehicle network to a standby mode when certain conditions for saving power consumption are satisfied. In this mode, the system clock is normally stopped for nodes transitioning to standby mode. Subsequently, if one of these nodes starts communicating with the other node as the controlling node, the other node in standby mode is "woke up" and switches to normal operation mode. However, the control node does not necessarily communicate with all other nodes on the vehicle network. Therefore, it is preferable and efficient to wake up only the destination node or nodes that ar...

Claims

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Application Information

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IPC IPC(8): H04B3/06
CPCH04L12/12H04L12/40039Y02B60/34Y02D30/50
Inventor 寺部雅能市桥基堀井佑树阿部孝司
Owner DENSO CORP
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