Smart Power Distribution Unit for Autonomous Vehicle Fault Isolation
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Solution Overview
Problem
Current power distribution units in autonomous vehicles are passive and lack the ability to independently control and diagnose load units, leading to potential safety issues in Level 4 autonomous systems where human intervention is not possible.
Innovation Solution
A smart power distribution unit (PDU) that uses solid-state semiconductor switches and sensors to monitor voltage, current, and temperature, enabling independent control, power conditioning, and fault detection for each load unit, with bi-directional communication capabilities to ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a passive power distribution unit is used, then the device complexity is reduced, but the reliability and safety are compromised due to inability to detect and respond to fault conditions
Solution Approach 1:
The PDU divides the power distribution system into individually controllable segments through solid-state semiconductor switches for each load unit. This segmentation enables isolated fault detection and control, where each load unit can be monitored and disconnected independently, improving safety without requiring complete system redesign.
Solution Approach 2:
The PDU implements continuous feedback mechanisms through sensors that monitor voltage, current, and temperature for each load unit. This feedback enables real-time fault detection and automatic response actions, significantly improving reliability by allowing the system to detect and respond to abnormal conditions before they escalate into safety hazards.
2Reliability
If individual control and monitoring of each load unit is implemented, then the reliability is improved, but the device complexity increases due to additional switches and sensors
Solution Approach 1:
The PDU employs universal solid-state semiconductor switches and sensors that can be standardized across multiple load units. This multi-functionality approach allows the same hardware components to serve multiple purposes - switches control power distribution while simultaneously enabling fault isolation, and sensors monitor both operational parameters and fault conditions, reducing overall system complexity despite individual load unit monitoring.
Solution Approach 2:
The PDU enables load units to be self-monitored and self-isolated through automated fault detection and control. When a fault is detected in one load unit, the system automatically disconnects only that specific unit without requiring manual intervention or affecting other load units. This self-service capability improves reliability while minimizing the complexity of control mechanisms needed.
3Reliability
If fault detection capabilities are added to the PDU, then the reliability is improved, but the device complexity increases due to additional sensors and control mechanisms
Solution Approach 1:
The PDU merges fault detection sensors with the existing power distribution control circuitry. Temperature, voltage, and current sensors are integrated into the control unit that also manages the solid-state semiconductor switches. This merging of detection and control functions into a unified system reduces device complexity by eliminating separate standalone monitoring systems while maintaining comprehensive fault detection capabilities.
Solution Approach 2:
The PDU implements preliminary fault detection and prevention measures by continuously monitoring load conditions before failures occur. The system detects abnormal temperature rises, current leaks, or voltage deviations early in the fault development process and takes preventive action by disconnecting the affected load unit. This preliminary action approach improves reliability by preventing catastrophic failures while using relatively simple threshold-based detection rather than complex diagnostic systems.
Data Source
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AI summary
Devices, systems, and methods for power distribution in autonomous vehicles are described. An example method of power distribution includes receiving, by a controller disposed in a vehicle, an indication of a fault associated with a load unit of a plurality of load units, wherein the load unit is communicatively coupled to an associated solid-state semiconductor switch, disconnecting, in response to the receiving the indication of the fault, the associated solid-state semiconductor switch, and transmitting, using a controller area network bus in the vehicle communicatively coupled the controller, a digital data message indicative of disconnecting the associated solid-state semiconductor switch to a vehicle control unit.