Battery Protector Current Limiting Coefficient
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Solution Overview
Problem
In hybrid vehicles, controlling incoming and outgoing electric current to protect the battery becomes complex as the number of connected components increases, leading to potential battery degradation and malfunction.
Innovation Solution
A battery protector system that acquires and limits input/output current indices, calculates a limit coefficient based on battery state, and adjusts request values for vehicle components to prevent excessive current flow without monitoring each component's state, thereby protecting the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-order controller monitors the state and incoming/outgoing electric current for each component connected to the battery, then battery protection is achieved, but the control method becomes complicated as the number of components increases
Solution Approach 1:
The patent segments the control approach by separating component-specific monitoring from battery protection control. Instead of monitoring each component individually, the system divides the problem into: (1) acquiring a total current index value from the battery, and (2) calculating a unified limit coefficient based on battery state. This segmentation simplifies the control architecture while maintaining protection effectiveness.
Solution Approach 2:
The patent extracts the essential protection function from complex component-level monitoring. By taking out only the necessary battery state parameters (charge/discharge state, temperature) and the total current index value, the system eliminates the need to monitor each component's detailed state. This extraction reduces information requirements while preserving the core protection capability.
2Adaptability or versatility
If the number of components connected to the battery increases, then vehicle functionality is improved, but the information required by the high-order controller increases
Solution Approach 1:
The patent merges the current monitoring function at the battery level rather than at each component level. By combining all component currents into a single battery current index value and using a unified limit coefficient for all components, the system reduces information processing load. This merging approach allows multiple components to be controlled with consolidated information about battery state and total current.
3Reliability
If continuous charge and discharge operations are performed on the battery, then power supply reliability is maintained, but battery degradation and malfunction occur
Solution Approach 1:
The patent implements feedback control by continuously monitoring battery state (charge/discharge state, temperature) and adjusting the limit coefficient accordingly. When the battery approaches its limits or temperature increases, the limit coefficient is reduced, automatically limiting charge/discharge current to prevent degradation. This feedback mechanism balances power supply reliability with battery longevity by dynamically adapting protection levels based on real-time battery conditions.
Data Source
AI summary
A battery is protected without realizing the state of every vehicle element connected to the battery or the battery input/output current. A current limit value setting unit sets a current limit value for limiting the battery input/output current in accordance with state of the battery. A limiting current ratio calculation unit calculates a ratio of the current limit value set by the current limit value setting unit to a detected battery current value. A request limit coefficient calculation unit calculates a limit coefficient for limiting a request value for driving respective vehicle components based on the ratio calculated by the limiting current ratio calculation unit. In addition, a final request value calculation unit calculates as a final request value for the respective vehicle components, respective multiplication values resulting from multiplying the respective request values for the respective components by the limit coefficient calculated by the request limit coefficient calculation unit.