Electric Vehicle Bus Coordination for Reliable Power Messaging
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Solution Overview
Problem
Existing electric vehicles lack efficient digital communication between components, leading to bandwidth shortages and potential interference on communication networks, particularly affecting power components like batteries.
Innovation Solution
Implementing a Vehicle Control Module (VCM) that coordinates digital message traffic over separate Power Communication Network (PCN) and Vehicle Communication Network (VCN) buses, synchronizing baud rates, filtering messages relevant to power components, and using message queues to optimize communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital message traffic is transmitted over a single communication bus in existing electric vehicles, then device complexity is reduced, but bandwidth shortages and interference occur affecting communication reliability
Solution Approach 1:
The communication network is segmented into two separate buses: PCN bus for power component communication and VCN bus for vehicle control communication. This segmentation prevents bandwidth shortages and interference by dedicating separate communication channels for different traffic types, thereby improving communication reliability without requiring a single overloaded bus.
Solution Approach 2:
The VCM acts as an intermediary device that receives messages from both PCN and VCN buses, processes them, and routes them appropriately. This mediator coordinates traffic between the two buses, managing message queues and synchronizing baud rates, which resolves the contradiction by enabling reliable communication across segmented networks while maintaining systematic control.
2Productivity
If separate PCN and VCN buses are implemented with different baud rates, then communication efficiency for power components is improved, but coordination complexity between buses increases
Solution Approach 1:
Each bus (PCN and VCN) is assigned its own optimized baud rate suitable for its specific communication needs. The PCN bus uses a baud rate optimized for power component communication while the VCN bus uses a baud rate optimized for vehicle control communication. This local optimization improves communication efficiency for each domain without requiring uniform baud rates across the entire system.
Solution Approach 2:
The VCM serves as a mediator that handles baud rate coordination between the PCN and VCN buses. It synchronizes its own baud rate with the PCN bus and manages message routing between buses with different baud rates, thereby enabling efficient differentiated communication while centralizing the complexity of coordination in a single device.
3Reliability
If all digital messages are routed through the VCM, then message filtering and coordination are improved, but transmission time increases due to message queuing
Solution Approach 1:
The VCM acts as an intermediary that receives messages from both buses, filters them based on relevance, and routes them to appropriate destinations. This centralized filtering and routing improves message routing reliability by ensuring only relevant messages are transmitted and properly directed, while the message queuing mechanism manages transmission timing to minimize delays.
Solution Approach 2:
The system implements acknowledgment mechanisms where destination components send acknowledgments back to the VCM for successful message reception. The VCM uses this feedback to manage its message queue, removing acknowledged messages and tracking transmission status. This feedback loop improves routing reliability while allowing the system to optimize transmission timing based on actual delivery confirmation.
Data Source
AI summary
There are provided methods and systems for operating electric vehicles. One example method includes generating a first digital message at a source component of the electric vehicle. The source component is connected to a first bus comprising one of a Power Communication Network bus (PCN bus) and a Vehicle Communication Network bus (VCN bus) of the electric vehicle. The PCN and VCN buses are each connected to a Vehicle Control Module (VCM) of the electric vehicle. The method also includes transmitting the first digital message from the source component to the VCM over the first bus, and generating at the VCM a second digital message based on the first digital message. In addition, the method includes transmitting the second digital message from the VCM to a destination component of the electric vehicle. The destination component is connected to a second bus comprising one of the PCN and VCN buses.