Battery Charge Control via Dynamic Power Adjustment
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Solution Overview
Problem
Existing methods for controlling battery charge and discharge in hybrid vehicles do not effectively enhance fuel efficiency, are limited to specific driving modes and road conditions, and require complex data processing, without substantially influencing battery charging power.
Innovation Solution
A method and system that adjust battery charging and discharging power based on detected temperature and state of charge, using a battery management system with discharging and charging power maps to determine optimal power values, allowing for increased charging power and enhanced fuel efficiency across various conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If existing methods limit battery charge and discharge by controlling SOC range, then battery life is protected, but fuel efficiency improvement is insufficient
Solution Approach 1:
The patent changes the control parameter from SOC range limitation to direct charging power adjustment. By dynamically adjusting the charging power based on vehicle state and road gradient, the system optimizes energy recovery during regenerative braking while protecting battery life, thereby improving fuel efficiency without unnecessarily limiting charging capability
2Measurement precision
If complex data processing is used to determine running state and road state, then control precision is improved, but device complexity increases
Solution Approach 1:
The control unit performs multiple functions using a unified control logic that integrates vehicle state detection, road gradient estimation, and charging power determination. This multi-functional approach achieves precise state detection without requiring separate complex processing systems for each function
3Loss of energy
If charging power is increased to enhance fuel efficiency, then energy recovery is improved, but battery reliability may be compromised
Solution Approach 1:
The patent implements dynamic charging power adjustment based on real-time vehicle state and road gradient conditions. During regenerative braking, the system calculates optimal charging power that maximizes energy recovery while considering battery charge/discharge cycle limits, thereby maintaining battery reliability while enhancing fuel efficiency
Data Source
AI summary
A method and system for controlling charge and discharge of a battery are provided. The method includes detecting a battery temperature using a temperature sensor and determining, by a controller, a state of charge (SOC) of the battery, a first maximum discharging power value, and a first maximum charging power value that correspond to the battery temperature. The controller selects a lowest SOC from among at least one SOC to use a maximum discharging power equal to the determined first maximum discharging power value and resets the first maximum charging power value to a second maximum charging power value that corresponds to the selected lowest SOC. Further, the controller is configured to perform a charge and a discharge of the battery with the reset second maximum charging power value at the detected battery temperature.