Vehicle Zonal Power Distribution With Redundant ECU Backup
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Solution Overview
Problem
Existing power distribution systems in electric vehicles lack redundancy, which can lead to the failure of critical systems when one or more power sources or electronic control units malfunction, compromising the vehicle's operation and safety.
Innovation Solution
A zonal architecture for power distribution with redundant power sources and electronic control units (ECUs) that are geographically organized, allowing continuous power supply from multiple sources, such as a DCDC converter and a low-voltage battery, ensuring critical functions like ADAS continue to operate even if one power source fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single power source is used for each ECU, then the device complexity is reduced, but the reliability deteriorates because the system fails when the power source malfunctions
Solution Approach 1:
The vehicle's power distribution system is divided into multiple geographic zones, each with its own ECU and power sources. This segmentation allows isolated faults in one zone from affecting other zones, improving overall system reliability while managing complexity through modular organization.
Solution Approach 2:
Redundant power sources are pre-configured in the system so that when a primary power source fails, a backup power source is already available to take over. This beforehand cushioning ensures continuous operation of critical systems without requiring complex real-time switching decisions.
2Reliability
If redundant power sources are implemented, then the reliability is improved, but the device complexity increases due to multiple power sources and distribution paths
Solution Approach 1:
The power distribution system is segmented into geographic zones with dedicated ECUs and power sources. This modular approach allows redundancy to be implemented locally in each zone rather than system-wide, improving reliability while containing complexity within manageable modules.
Solution Approach 2:
Redundant power sources and ECUs are strategically placed in specific geographic zones based on their functional requirements. Critical systems receive redundant power supplies while less critical systems may use simpler single-source configurations, optimizing the balance between reliability and complexity.
3Reliability
If multiple ECUs are used for redundancy, then the reliability is improved, but the device complexity increases due to additional control units and coordination requirements
Solution Approach 1:
ECU functions are segmented and distributed across multiple geographic zones with each ECU handling specific zone responsibilities. This segmentation enables functional redundancy where multiple ECUs can perform similar critical functions independently, improving reliability while reducing coordination complexity through clear zone-based responsibilities.
Solution Approach 2:
Multiple ECUs are pre-configured with identical or complementary functions in different geographic zones. When a primary ECU fails, a backup ECU in another zone can immediately take over its functions without requiring complex real-time coordination or reconfiguration, simplifying the operational complexity.
Data Source
AI summary
A vehicle with a zonal architecture for power distribution may include east and west electronic control units (ECUs) operating components on respective sides of the vehicle's longitudinal axis, and a south ECU at the rear. The east ECU features a low voltage direct current to direct current (DCDC) support circuit block. ECU functions may be distributed based on geographic zones, allowing for backup operations if a primary unit fails.