Vehicle Power Path Control for Shared Overcurrent Interruption
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Solution Overview
Problem
Existing vehicle-mounted power systems face challenges in implementing overcurrent protection without increasing the number of components when multiple transfer units are involved, as existing solutions require separate interruption units for each path.
Innovation Solution
A vehicle-mounted control device with a common path and branch paths, including switches and an interruption unit that switches based on operation-specific conditions, allowing overcurrent protection without the need for individual interruption units for each transfer unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate interruption units are provided for each path corresponding to each transfer unit, then overcurrent protection is improved, but the number of components increases
Solution Approach 1:
The single interruption unit is designed to perform overcurrent protection for multiple transfer units (first transfer unit and second transfer unit) through different operational modes. The control unit configures the interruption unit to operate with different current thresholds depending on which transfer unit is active, allowing one component to serve multiple protection functions that would traditionally require separate components for each path.
2Device complexity
If a single interruption unit is used for multiple transfer units, then the number of components is reduced, but the precision of overcurrent protection decreases
Solution Approach 1:
The interruption unit operates dynamically with configurable current thresholds based on the operational state. The control unit switches between a first current threshold when the first transfer unit is operating and a second current threshold when the second transfer unit is operating. This dynamic adaptation ensures that the single interruption unit maintains precise protection characteristics appropriate for each specific transfer unit being protected.
Data Source
AI summary
A vehicle-mounted control device (1) includes a control unit (21) that switches an interruption unit (14) from an allowable state to an interruption state when an interruption condition is satisfied, and a setting unit (22) that sets the interruption condition. The setting unit (22) sets the interruption condition based on which operation of a first operation and a second operation is in execution. The first operation is an operation of transferring power between a power storage unit (90) and a first transfer unit (connection unit (91)) when a first switch (11) is in an on state, and the second operation is an operation of transferring power between the power storage unit (90) and a second transfer unit (first load (92)) when a second switch (12) is in an on state.