Reversible Fuse Control for Selective Power Isolation
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Solution Overview
Problem
In transportation vehicles designed for autonomous driving, the existing on-board power supply systems lack selectivity in fuse paths, leading to complete disconnection when a fault occurs, affecting all consumers due to the rapid triggering of fuses, rather than isolating the faulty path.
Innovation Solution
A transportation vehicle on-board power supply system with reversible primary and secondary fuses, where a control device selectively actuates the fuses to identify and isolate fault-free paths, ensuring that only affected paths are disconnected, allowing other consumers to continue receiving energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rapid fuse triggering is used to ensure quick fault response, then reliability is improved, but selectivity deteriorates causing complete disconnection of all consumers
Solution Approach 1:
The electrical system is divided into multiple independent paths, each with its own fuse (primary fuse per path, secondary fuses per consumer). This segmentation allows selective disconnection of only the faulty path while keeping other paths operational, resolving the contradiction between rapid response and selectivity.
Solution Approach 2:
A control device acts as an intermediary between the fuse triggering event and the actual disconnection action. It receives signals from triggered fuses, determines the faulty path, and selectively actuates only the necessary fuses to isolate the fault, preventing unnecessary disconnection of healthy consumers.
2Reliability
If all fuses are disconnected when a fault occurs, then safety is improved, but productivity deteriorates due to complete system shutdown
Solution Approach 1:
The system is segmented into multiple independent power paths with individual fuses for each path and consumer. When a fault occurs, only the fuses in the affected path are actuated, allowing other segments to continue operating and maintaining system productivity while ensuring safety in the faulty segment.
Solution Approach 2:
The protective action is localized to only the necessary area. Instead of a blanket disconnection of all fuses, the control device identifies and actuates only the specific fuses related to the faulty path, applying the protective measure locally rather than globally.
3Adaptability or versatility
If selective fuse actuation is implemented, then selectivity is improved, but device complexity increases due to control requirements
Solution Approach 1:
The fuses are designed as reversible fuses with built-in signaling capability that automatically communicate their triggered state to the control device. This self-service feature reduces the complexity of the control system by eliminating the need for complex monitoring circuits, as the fuses themselves provide the fault information.
Solution Approach 2:
The control device receives feedback signals from the reversible fuses when they are triggered. This feedback mechanism enables the control device to make informed decisions about which fuses to actuate, implementing selective protection through a relatively simple control logic based on the fuse states.
Data Source
AI summary
A transportation vehicle on-board power supply system, a method, and a fuse device. The transportation vehicle on-board power supply system includes a battery, consumers, a primary fuse and paths via which the primary fuse, is electrically coupled in series with each one of the consumers, wherein each path has at least one secondary fuse. The primary fuse and the secondary fuses are reversible fuses and a control device of the transportation vehicle on-board power supply system accesses the fuses. The control device determines whether a fault has arisen in the transportation vehicle on-board power supply system, the fault satisfying a triggering criterion at least for one of the fuses having at least two of the paths, and selectively actuates the fuses so the fault-free paths are identified and the fuses in the fault-free paths are switched on again.