Adaptive Regenerative Braking Torque Control
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Solution Overview
Problem
Electrified vehicles face inefficiencies due to aggressive regenerative braking, which slows the vehicle faster than coasting and introduces energy losses when the brake and accelerator pedals are not depressed, making it difficult for drivers to optimize regenerative braking.
Innovation Solution
An adaptive regenerative braking system that uses an object detection system to detect upcoming decelerations, adjusting regenerative braking torque based on the presence of objects in the vehicle's path or traffic signals, allowing for optimized regenerative braking by permitting or reducing it accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If aggressive regenerative braking is applied to maximize energy recovery, then energy efficiency is improved, but fuel economy deteriorates due to unnecessary deceleration and energy losses
Solution Approach 1:
The system dynamically adjusts regenerative braking intensity based on real-time detection of upcoming deceleration events. The object detection system continuously monitors the environment and modifies regenerative braking application according to detected objects, traffic signals, and road conditions, allowing the vehicle to coast when safe and apply regenerative braking only when necessary to maintain or improve fuel economy
Solution Approach 2:
The system uses feedback from the object detection system to continuously monitor the vehicle's operating environment and adjust regenerative braking accordingly. The controller receives information about detected objects, traffic signals, and road conditions, and uses this feedback to determine the optimal level of regenerative braking application, permitting it when deceleration is detected and reducing it when no deceleration is needed
2Use of energy by moving object
If regenerative braking is continuously applied to recover energy, then battery charging is improved, but vehicle controllability deteriorates due to reduced driver input responsiveness
Solution Approach 1:
The system dynamically engages and disengages regenerative braking based on detected environmental conditions. When the object detection system identifies no upcoming deceleration events, the system permits regenerative braking to maximize energy recovery. When objects, pedestrians, or traffic signals are detected that may require sudden deceleration, the system reduces or prevents regenerative braking to maintain full driver controllability and responsive vehicle operation
3Loss of energy
If regenerative braking is reduced to improve fuel economy, then energy losses are minimized, but braking performance deteriorates when rapid deceleration is needed
Solution Approach 1:
The object detection system performs preliminary detection of potential hazards, traffic signals, and road conditions ahead of the vehicle. This advance information allows the control system to proactively adjust regenerative braking levels before actual braking is needed, permitting aggressive regenerative braking when the path is clear and reducing it when deceleration may be required, ensuring both energy efficiency and braking performance
Solution Approach 2:
The system continuously monitors environmental conditions through the object detection system and uses this feedback to adjust regenerative braking in real-time. When rapid deceleration is detected or anticipated through object detection, the system immediately permits or increases regenerative braking to maintain reliable braking performance while still minimizing energy losses during periods when deceleration is not required
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 optimizes regenerative braking by reducing unnecessary energy conversion losses, improving fuel economy by allowing the vehicle to coast when no deceleration is needed and applying regenerative braking only when required, thus enhancing overall efficiency.
Implementation Method 1
The regenerative braking assembly applies more regenerative braking torque when an upcoming deceleration is detected by the monitoring assembly than when the upcoming deceleration is not detected by the monitoring assembly
Implementation Method 2
The brake torque can include some brake torque from friction braking and some brake torque from regenerative braking
Data Source
AI summary
An exemplary braking method includes monitoring for an upcoming deceleration of an electrified vehicle, permitting an amount of regenerative braking if the upcoming deceleration is detected, and reducing the amount of regenerative braking if the upcoming deceleration is not detected.