Regenerative Braking Control for Stable Low-Speed Deceleration
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Solution Overview
Problem
Existing electrified vehicles face challenges in maintaining fuel efficiency and braking stability during deceleration due to the reliance on regenerative braking termination vehicle speed, which can be influenced by varying traveling environments.
Innovation Solution
A method and system for controlling regenerative braking in electrified vehicles that adjusts the regenerative braking continuation range and retention amount based on traveling environment levels, maintaining the regenerative braking amount for a predetermined section before transitioning to hydraulic braking, thereby stabilizing braking and enhancing fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the regenerative braking termination vehicle speed is set low, then fuel efficiency increases due to increased regenerative braking energy, but braking stability deteriorates depending on traveling environments
Solution Approach 1:
The patent applies dynamics by making the regenerative braking termination vehicle speed adjustable rather than fixed. The control unit dynamically adjusts the termination speed based on detected traveling environments (wet, snowy, icy conditions), allowing the system to optimize between fuel efficiency and braking stability for each specific condition. This resolves the contradiction by enabling the system to operate at lower termination speeds in favorable conditions while maintaining higher speeds in adverse conditions.
Solution Approach 2:
The patent changes the parameter of regenerative braking termination vehicle speed based on traveling environment conditions. By detecting environmental parameters (road surface conditions, weather) and adjusting the termination speed parameter accordingly, the system achieves both improved fuel efficiency (when conditions permit lower speeds) and maintained braking stability (when conditions require higher speeds).
2Reliability
If the regenerative braking termination vehicle speed is set high, then braking stability improves, but fuel efficiency deteriorates due to reduced regenerative braking energy
Solution Approach 1:
The system dynamically adjusts the termination speed based on real-time environmental detection. In adverse conditions (wet, snowy, icy roads), the termination speed is set higher to ensure braking stability. In favorable conditions, the termination speed is reduced to maximize regenerative braking energy recovery, thus improving fuel efficiency. This dynamic adjustment resolves the contradiction between stability and efficiency.
Solution Approach 2:
The patent implements parameter changes by modifying the regenerative braking termination vehicle speed according to detected traveling environments. The control unit changes this parameter from a fixed value to a variable that adapts to environmental conditions, enabling the system to achieve both high braking stability (when needed) and high fuel efficiency (when conditions allow).
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 improves fuel efficiency by increasing regenerative braking energy utilization while ensuring stable braking across different traveling conditions, regardless of environmental factors.
Implementation Method 1
The regenerative braking method is a method in which the electric motor uses kinetic energy of a wheel to charge a battery, thereby decelerating the vehicle.
Data Source
AI summary
A method of controlling an electrified vehicle may include determining a traveling environment level; determining a regenerative braking continuation range and a regenerative braking retention amount according to the traveling environment level when a preset deceleration condition is satisfied; and determining whether to maintain a regenerative braking amount as the regenerative braking retention amount based on whether a vehicle speed is included in the regenerative braking continuation range when the vehicle speed is lower than or equal to a preset regenerative braking termination vehicle speed.