Onboard Vehicle Communication System Local Bus Power Management
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Solution Overview
Problem
Existing onboard vehicle communication systems experience decreased charging efficiency due to unnecessary power consumption when transmitting charge information, as ECUs temporarily switch from a sleep state to a wake-up state to determine if charge information needs to be routed through a different communication bus, even if it's not necessary.
Innovation Solution
The system employs a local bus that connects the first ECU group managing charge information directly to the onboard vehicle communication device, allowing charge information to be transmitted without routing through the gateway, thereby avoiding unnecessary wake-ups and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If charge information is routed through the gateway via global buses, then the ECU can determine whether to receive the information, but the ECU must temporarily switch from sleep state to wake-up state increasing power consumption
Solution Approach 1:
The communication path is segmented into two separate routes: a local bus directly connecting the first ECU and onboard vehicle communication device for charge information transmission, and global buses connected through the gateway for other vehicle communications. This segmentation allows charge information to be transmitted without activating the gateway and other ECUs, thus reducing power consumption while maintaining transmission reliability.
Solution Approach 2:
A local bus is introduced as an intermediary communication channel between the first ECU and the onboard vehicle communication device. This intermediary pathway bypasses the gateway and global buses, enabling direct transmission of charge information and avoiding unnecessary wake-up states in ECUs connected to the global buses.
2Ease of operation
If the ECU switches to wake-up state to check charge information routing, then routing decisions can be made, but charging efficiency decreases
Solution Approach 1:
The communication system is divided into separate segments with the local bus dedicated to charge information transmission and global buses for other purposes. This segmentation enables charge information to be transmitted without requiring other ECUs to wake up, maintaining routing flexibility while preserving charging efficiency.
Solution Approach 2:
The charge information transmission function is extracted from the general-purpose global bus system and placed on a dedicated local bus. This extraction allows charge information to be transmitted independently without involving the gateway or waking up ECUs on the global bus, thus maintaining operational flexibility while improving charging efficiency.
3Use of energy by moving object
If a local bus is introduced to connect first ECU and onboard vehicle communication device directly, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The communication system is segmented into distinct functional areas with the local bus handling charge information and global buses handling other vehicle communications. While this adds a communication channel, it maintains clear functional separation and does not significantly increase overall system complexity.
Solution Approach 2:
The first ECU serves multiple functions: it manages charge information transmission via the local bus and continues to participate in global bus communications when needed. This multi-functionality reduces the need for dedicated specialized components, thereby limiting the increase in device complexity while achieving power savings.
Data Source
AI summary
An onboard vehicle communication system includes a first ECU configured to manage charge information of a vehicle, a gateway connected to the first ECU, a second ECU connected to the gateway, an onboard vehicle communication device configured to communicate with the outside of the vehicle, and a local bus that connects the first ECU and the onboard vehicle communication device. The first ECU is configured to transmit charge information of the vehicle to the onboard vehicle communication device via the local bus when an external charge device is charging a vehicle.