Battery Management System for Regenerative Braking Safety
Solution Overview
Problem
In electric vehicles, regenerative braking is restricted when the battery is fully charged, leading to overheating of brake pads, inconsistent vehicle braking, and decreased fuel economy during downhill road travel in hilly areas, resulting in increased recharging costs and safety concerns.
Innovation Solution
A battery management system that acquires position information of recharging stations, checks if they are in hilly areas, and adjusts the state of charge (SOC) to prevent regenerative braking restrictions by learning and re-learning SOC values based on the end time of downhill travel, using a controller to manage battery recharging and limit SOC to prevent regenerative braking restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the battery is fully charged before downhill travel, then recharging efficiency is improved, but regenerative braking is restricted causing brake overheating and safety issues
Solution Approach 1:
The system performs preliminary detection of downhill road conditions before the vehicle travels. When downhill travel is detected, the controller pre-adjusts the full SOC threshold value before the battery becomes fully charged, preventing regenerative braking restriction from occurring in the first place during downhill travel.
Solution Approach 2:
The system uses feedback from road condition detection (via inclination sensor or map data) to dynamically adjust the full SOC threshold. The controller continuously monitors whether the vehicle is on a downhill road and adjusts the SOC threshold accordingly, creating a closed-loop control system that adapts to changing conditions.
2Reliability
If the battery SOC is restricted during downhill travel, then regenerative braking restriction is avoided, but fuel economy deteriorates
Solution Approach 1:
The system applies different SOC threshold values for different road conditions. Instead of using a single universal full SOC threshold, the controller uses a location-specific or condition-specific threshold that is adjusted based on whether the vehicle is on a downhill road, thereby optimizing performance for local conditions.
Solution Approach 2:
The full SOC threshold value is made dynamic rather than static. The controller adjusts the threshold in real-time based on detected road conditions, allowing the system to adapt the charging strategy dynamically - using a lower threshold during downhill travel and a normal threshold during other conditions.
3Temperature
If regenerative braking is restricted, then brake overheating is prevented, but fuel economy and recharging costs increase
Solution Approach 1:
The system performs preliminary detection of downhill road conditions before the vehicle travels. When downhill travel is detected, the controller pre-adjusts the full SOC threshold value before the battery becomes fully charged, preventing regenerative braking restriction from occurring in the first place during downhill travel.
Solution Approach 2:
The system changes the SOC threshold parameter based on road conditions. By adjusting this key parameter, the system enables or disables regenerative braking functionality appropriately - allowing it during normal conditions for energy recovery, and preventing restriction during downhill travel for safety.
Data Source
AI summary
A battery management system for a vehicle, a battery management method thereof and a vehicle including the same, which can vary a state of charge (SOC) of a battery in accordance with a location of a recharging station are disclosed. The battery management system includes: a position information acquisition unit for acquiring position information of a recharging station and the vehicle; a storage for storing a hilly area recharging station list comprising position information of hilly area recharging stations and learned full SOC values; and a controller for controlling the position information acquisition unit and the storage. The controller checks whether a recharging station where recharging of the vehicle is executed is a hilly area recharging station, and restricts a full SOC in order to avoid restriction of regenerative braking according to downhill road travel, thereby enhancing fuel economy and safety.