Vehicle Network Communication Node Switch Control
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Solution Overview
Problem
Current vehicle network technologies, such as CAN and FlexRay-based networks, fail to support the higher transmission rates and system expandability required by advanced safety systems like telematics and infotainment, and applying MOST-based networks is costly, leading to inefficiencies in wake-up signal transmission and operation mode transitions in vehicle communication nodes.
Innovation Solution
A communication node with a medium access control (MAC) layer and physical (PHY) layer, featuring a switch that manages connections between ports, using N channel and P channel MOSFET transistors to control electrical connections, allowing signal transfer during sleep mode and disconnecting during normal mode to facilitate faster wake-up and accurate wake-up reason message transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the communication node remains connected during sleep mode to receive wake-up signals, then wake-up signal reception is enabled, but power consumption increases
Solution Approach 1:
The connection path is segmented into two separate paths: a low-power path through the second switch for wake-up signal reception, and a normal communication path through the first switch. This segmentation allows the node to receive wake-up signals while in sleep mode without maintaining full connection power consumption
Solution Approach 2:
The second switch acts as an intermediary component that enables wake-up signal reception during sleep mode. It provides a dedicated low-power pathway that mediates between the need to remain disconnected for power saving and the need to receive wake-up signals
2Use of energy by moving object
If the switch disconnects during normal mode to save power, then power consumption is reduced, but wake-up reason message transmission may be missed
Solution Approach 1:
The first switch is turned off after wake-up to prepare for normal operation, but the second switch remains on to maintain the ability to receive and forward wake-up reason messages. This preliminary action configuration prevents information loss while managing power consumption
Solution Approach 2:
The second switch serves as a mediator that maintains communication capability for wake-up reason messages even when the first switch is disconnected. It ensures that important information can still be transmitted without requiring full connection power consumption
3Device complexity
If the communication node uses traditional wake-up signal transmission without switch control, then system complexity is reduced, but wake-up time increases
Solution Approach 1:
The switch control system dynamically adjusts the connection state based on operational mode: the first switch is on during sleep mode for quick wake-up signal reception and turns off during normal mode, while the second switch maintains appropriate states. This dynamic control reduces wake-up time despite increased system complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces the time required for end nodes to wake up and ensures that wake-up reason messages are transmitted without being missed, improving the efficiency and reliability of vehicle network operations.
Implementation Method 1
using N channel and P channel MOSFET transistors to control electrical connections
Data Source
AI summary
A communication node in a vehicle network may comprise a medium access control (MAC) layer; a physical (PHY) layer; a first port connected to the PHY layer; a second port connected to the PHY layer; and a switch controlling a connection between the first port and the second port. The switch may turn on or off the connection between the first port and the second port under control of the MAC layer.