Slave Node Prohibition Signal Circuit for Selective Wake-Up
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Solution Overview
Problem
Existing communication systems require all nodes to have activation frame detection sections for wake-up, leading to complex configurations and increased costs.
Innovation Solution
A communication system where a master node outputs a prohibition signal to a slave node via a dedicated signal line, preventing the slave node from waking up even when an activation frame is transmitted on the communication bus, allowing only necessary nodes to wake up for communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all communication nodes are equipped with activation frame detection sections to enable individual wake-up, then wake-up capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the activation frame detection function from individual nodes and centralizes it in the master node. The master node detects activation frames and selectively activates only the necessary slave nodes, eliminating the need for complex detection sections in each node while maintaining reliable wake-up capability.
Solution Approach 2:
The master node acts as an intermediary between the activation frame and the slave nodes. It receives the activation frame, determines which slave nodes need to be activated, and then initiates their wake-up through simplified signaling, thereby reducing the complexity of individual node configurations.
2Reliability
If all communication nodes wake up upon receiving activation frames, then communication readiness is improved, but energy consumption increases
Solution Approach 1:
The patent applies local quality by enabling only the specific slave nodes that are currently needed for communication to wake up, rather than activating all nodes uniformly. The master node selectively activates individual slave nodes based on communication requirements, optimizing energy consumption while ensuring communication readiness.
Solution Approach 2:
Instead of activating all slave nodes (excessive action), the system activates only the necessary subset of slave nodes (partial action) based on the master node's assessment of communication needs. This reduces unnecessary energy consumption while maintaining adequate communication readiness.
3Reliability
If activation frames are transmitted to all nodes, then wake-up reliability is improved, but communication efficiency deteriorates due to unnecessary wake-ups
Solution Approach 1:
The master node performs preliminary assessment to determine which slave nodes need to be activated before initiating the wake-up process. This preliminary action ensures that only necessary nodes are woken up, improving communication efficiency while maintaining wake-up reliability for the required nodes.
Solution Approach 2:
The system applies differentiated treatment to different slave nodes based on their specific communication needs. The master node identifies and activates only the relevant slave nodes rather than applying a uniform activation approach, thereby improving overall communication efficiency while ensuring reliable wake-up for necessary nodes.
Data Source
AI summary
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.