Communication system and communication node
AssigneeDenso Corporation
InventorAkito ITOU
Life of this patent
Estimating the term…
Abstract
A main body ECU as a slave node includes a switch. The switch is under OFF state when a prohibition signal is outputted from a verification ECU as a master node and under ON state when the prohibition signal is not outputted. The switch is inserted in a reception path between a receive port of a microcomputer of the main body ECU and a receiver of a transceiver that is connected with a communication bus. When the switch is under OFF state, a reception signal outputted by the transceiver is not inputted into the microcomputer of the main body ECU. Therefore, the microcomputer is not activated even if an activation frame is transmitted to the communication bus; this enables the main body ECU to maintain a sleep mode.
Claims13
A communication system including a plurality of communication nodes that communicate with each other via a communication bus,
- the communication nodes including at least a first communication node and a second communication node, the first communication node including a sleep mode and a usual mode as an operation mode, the sleep mode stopping communication via the communication bus to suppress electricity consumption, the usual mode enabling communication via the communication bus, the first communication node under the sleep mode moving from the sleep mode to the usual mode upon receiving an activation frame via the communication bus,
- the communication system comprising:
- a signal line that is different from the communication bus, the signal line connecting between the first communication node and the second communication node;
- a prohibition signal output section provided in the second communication node to output a prohibition signal to the first communication node being under the sleep mode via the signal line to prohibit the first communication node from moving from the sleep mode to the usual mode;
- and
- a prohibition section provided in the first communication node, wherein after receiving the prohibition signal from the second communication node via the signal line, the prohibition section maintains the first communication node under the sleep mode by prohibiting the first communication node from moving from the sleep mode to the usual mode even when the activation frame is transmitted in the communication bus.
A communication node included in a communication system that include in addition to the communication node a plurality of other communication nodes that communicate with each other and with the communication node via a communication bus, the communication node including a sleep mode and a usual mode as an operation mode, the sleep mode stopping communication via the communication bus to suppress electricity consumption, the usual mode enabling communication via the communication bus, the communication node under the sleep mode moving from the sleep mode to the usual mode upon receiving an activation frame via the communication bus,
- the communication node comprising:
- a communication port connected with a signal line that is different from the communication bus, the signal line connecting the communication node with a different communication node among the plurality of other communication nodes;
- and
- a prohibition section to maintain the communication node under the sleep mode after receiving the prohibition signal from the different communication node via the signal line, by prohibiting the communication node from moving from the sleep mode to the usual mode even when the activation frame is transmitted in the communication bus.
A communication node included in a communication system that include in addition to the communication node a plurality of other communication nodes that communicate with each other and with the communication node via a communication bus,
- the communication node comprising:
- a communication port connected with a signal line that is different from the communication bus, the signal line connecting the communication node with a different communication node included in the plurality of other communication nodes;
- and
- a prohibition signal output section to output a prohibition signal to the different communication node via the signal line, the prohibition signal prohibiting the different communication node under a sleep mode from moving from the sleep mode to a usual mode even when receiving an activation frame via the communication bus, the sleep mode stopping communication via the communication bus to suppress electricity consumption, the usual mode enabling communication via the communication bus.
Dependencies are inferred from the claim text.