Dual Cutoff Control for Vehicle Power Line Overcurrent States
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Solution Overview
Problem
Existing power line control systems, such as U.S. Pat. No. 9,221,343, fail to account for multiple overcurrent states and do not provide appropriate control measures for each state, leading to inadequate protection against electrical leakage to the vehicle body.
Innovation Solution
A cutoff control apparatus with a first and second cutoff unit, where the second unit engages the cutoff state upon detection of a first overcurrent state when the first unit is canceled, and a control apparatus that switches the first unit to the cutoff state upon detection of a second overcurrent state, allowing differentiated control for each state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single cutoff unit is used to protect against overcurrent, then the device complexity is reduced, but the reliability of protection against multiple overcurrent states deteriorates
Solution Approach 1:
The power line is divided into multiple segments with separate cutoff units (first cutoff unit 34A and second cutoff unit 34B) positioned at different locations. Each cutoff unit independently monitors and responds to overcurrent conditions in its respective segment, enabling differentiated protection strategies for different overcurrent states without requiring a single complex control system.
2Reliability
If differentiated control for multiple overcurrent states is implemented, then the reliability of protection is improved, but the device complexity increases
Solution Approach 1:
Different cutoff units are assigned different functional characteristics and control strategies based on their specific positions and protection requirements. The first cutoff unit 34A responds to second overcurrent states (more severe conditions) while the second cutoff unit 34B responds to first overcurrent states (less severe conditions), allowing each unit to be optimized for its specific protection role rather than requiring all units to handle all conditions.
3Ease of operation
If a single threshold cutoff strategy is used, then the ease of operation is improved, but the adaptability to different overcurrent states deteriorates
Solution Approach 1:
The system employs multiple current thresholds (first threshold and second threshold where second threshold > first threshold) to differentiate between various overcurrent states. The first cutoff unit 34A is configured with a higher second threshold for severe overcurrent conditions, while the second cutoff unit 34B uses a lower first threshold for moderate overcurrent conditions, enabling automatic adaptation to different fault severity levels without complex manual configuration.
Data Source
AI summary
A cutoff control apparatus controls a cutoff unit in a vehicle-mounted system which includes: a power storage unit; a power line between the power storage unit and a load; and the cutoff unit that switches between a cutoff state that cuts off supplying of power on the power line from the power storage unit side to the load side and a canceled state where the cutoff state is canceled. In the vehicle-mounted system, the cutoff unit includes a first cutoff unit and a second cutoff unit, and the second cutoff unit enters the cutoff state when a first overcurrent state has occurred on the power line with the first cutoff unit in the canceled state. The cutoff control apparatus includes a control apparatus that instructs the first cutoff unit to switch to the cutoff state when the power line is in a second overcurrent state.