Regenerative Braking Control Using Driving Conditions and Battery SOC
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Solution Overview
Problem
Existing vehicles equipped with battery power, such as electric vehicles, hybrid electric vehicles, and plug-in hybrid electric vehicles, face challenges in efficiently managing regenerative braking, particularly when the battery is fully charged, leading to increased load on brake components and potential durability issues.
Innovation Solution
An apparatus and method for controlling regenerative braking based on driving information, including a driving information generation device, a controller, and a charging device. This system generates driving information, such as slope values and elevation differences, to determine when to prohibit regenerative braking and adjust battery charging accordingly, thereby optimizing brake load and battery state-of-charge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If regenerative braking is used to charge the battery, then energy economy is improved, but brake load increases when the battery is fully charged
Solution Approach 1:
The system dynamically adjusts the regenerative braking control strategy based on real-time battery state-of-charge (SOC) levels and driving conditions. When SOC is high, the controller reduces or prohibits regenerative braking to prevent excessive brake load, while allowing it when SOC is low to improve energy economy. This dynamic adaptation resolves the contradiction between energy recovery and brake durability.
Solution Approach 2:
The controller changes the regenerative braking parameter (brake torque allocation) based on battery SOC status. By monitoring battery charge level and adjusting the regenerative braking intensity accordingly, the system optimizes both energy recovery efficiency and brake component longevity, preventing the contradiction from manifesting.
2Strength
If regenerative braking is prohibited to reduce brake load, then brake durability is improved, but battery SOC required for driving is not obtained
Solution Approach 1:
The system dynamically switches between regenerative braking and friction braking modes based on battery SOC thresholds and predicted driving conditions. This dynamic control ensures that regenerative braking is utilized sufficiently to maintain required battery SOC while preventing excessive brake load through timely mode switching.
Solution Approach 2:
The controller performs preliminary assessment of battery SOC status and driving conditions before determining regenerative braking strategy. By predicting future energy needs and current brake wear status, the system proactively adjusts regenerative braking intensity to prevent both excessive brake load and insufficient battery charging.
3Strength
If regenerative braking is adjusted based on battery charge status, then brake load is optimized, but system complexity increases
Solution Approach 1:
The controller integrates multiple functions into a single control unit: it monitors battery SOC, determines driving conditions, calculates optimal regenerative braking torque, and switches between braking modes. This multi-functional integration achieves sophisticated brake load management without proportionally increasing system complexity.
Solution Approach 2:
The system implements feedback control by continuously monitoring battery SOC and brake status, then adjusting regenerative braking intensity accordingly. This closed-loop feedback mechanism enables intelligent optimization of brake load while maintaining relatively simple control logic through rule-based decision making.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces the load on brake components by intelligently managing regenerative braking based on driving conditions, thereby enhancing the durability of brake parts and optimizing battery charging.
Implementation Method 1
a motor generator that operates as a generator during regenerative braking
Implementation Method 2
a battery that is charged based on operation of the motor generator
Data Source
AI summary
An apparatus of controlling regenerative braking for battery charging according to driving information may include a driving information generation device that generates the driving information of a vehicle, a controller that is configured to control regenerative braking of the vehicle according to the generated driving information, and a charging device that controls charging of a battery of the vehicle according to the controlled regenerative braking.