Variable Regenerative Braking Torque Map Control
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Solution Overview
Problem
Eco-friendly vehicles using a single regenerative braking torque map for the D-gear fail to optimize energy recovery across varying road conditions, leading to inefficient energy use and fuel consumption, as drivers find it cumbersome to operate multiple gears for different torque maps.
Innovation Solution
A variable control method and apparatus that subdivides regenerative braking torque maps for gears D0 to DN, allowing drivers to adjust regenerative braking torque based on gear shifts using a paddle switch on the steering wheel, enabling selective use of torque maps for optimal energy recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single regenerative braking torque map is used for the D-gear, then the control system is simple, but energy recovery is not optimized for varying road conditions
Solution Approach 1:
The single regenerative braking torque map for the D-gear is segmented into multiple gear-level torque maps (D0, D1, D2, D3). Each map is optimized for specific driving conditions, allowing the system to adapt to varying road conditions while maintaining a unified control structure under the D-gear designation.
Solution Approach 2:
The system dynamically selects among multiple regenerative braking torque maps based on the current gear level (D0-D3) and driving conditions. This dynamic selection allows the control system to adapt to varying road conditions without requiring manual intervention or complex additional hardware.
2Adaptability or versatility
If multiple gears with different torque maps are provided, then energy recovery is optimized, but operation becomes cumbersome for drivers
Solution Approach 1:
The system performs self-service by automatically selecting the appropriate regenerative braking torque map based on the current gear level (D0-D3) and driving conditions. The driver simply needs to operate the paddle shift for basic gear changes, while the control system autonomously manages the complex torque map selection and energy recovery optimization.
3Loss of energy
If the B-gear is used for deceleration to obtain large regenerative braking energy, then energy recovery increases, but the vehicle deceleration feeling becomes substantial and the gear is difficult to use frequently
Solution Approach 1:
Different gear levels (D0-D3) within the D-gear have locally optimized torque maps tailored to specific driving conditions and road slopes. This allows drivers to achieve optimal energy recovery for their specific situation without the harsh deceleration characteristics of the B-gear, making the system more usable across diverse conditions.
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
This approach allows for increased energy recovery and improved fuel efficiency by enabling drivers to adjust regenerative braking torque dynamically based on gear selection, optimizing energy use across different driving conditions with convenient operation.
Implementation Method 1
eco-friendly vehicles run a regenerative braking (RB) mode that collects braking or inertia energy through electricity generation of an electric motor and charge a battery with the energy during braking or coasting by inertia of the vehicles
Data Source
AI summary
A variable control apparatus and method of the amount of regenerative braking of a vehicle using a paddle shift are provided. The method includes sensing, by a controller, positive (+) and negative (−) shifting in a manual mode based on a signal from a shift-operating unit during regenerative braking with a drive (D) gear engaged while the vehicle travels. A regenerative braking torque map that corresponds to a selected gear is selected based on the signal from the shift-operating unit. In addition, regenerative braking of a driving motor is adjusted based on the torque value calculated from the selected regenerative braking torque map.