Adaptive Regenerative Braking Control at Low EV Speeds

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Solution Overview

Problem

Regenerative braking in electric vehicles is less effective at low or zero rotational speeds, making it difficult to bring the vehicle to a complete stop and maintain consistent braking behavior across varying conditions such as weight and terrain.

Innovation Solution

A method and controller for controlling electric vehicles that adaptively adjust regenerative braking levels based on vehicle motion parameters like acceleration, roll back indicators, traction loss indicators, and environmental conditions, using sensors to dynamically change the braking level to ensure effective deceleration and maintain consistent vehicle behavior.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If regenerative braking is applied at a fixed initial level, then the system is simple to control, but the braking effectiveness is insufficient at low rotational speeds and varying conditions

Engineering Contradiction:

Improvebraking effectivenessVSAvoidcontrol system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The regenerative braking level is dynamically adjusted based on real-time vehicle motion parameters such as acceleration, roll back indicators, and traction loss indicators. The controller continuously monitors these parameters and modifies the braking level accordingly, transitioning from a static fixed-level system to a dynamic adaptive system that responds to changing operational conditions.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements feedback control by monitoring vehicle motion parameters (acceleration, roll back, traction loss) and using this information to adjust the regenerative braking level. The controller receives feedback from sensors measuring these parameters and modifies the braking application to maintain optimal performance across varying conditions.

Inventive Principle:

Principle #23Feedback

2Speed

If regenerative braking level is increased to improve deceleration, then braking performance improves, but traction loss occurs at low rotational speeds

Engineering Contradiction:

Improvedeceleration rateVSAvoidtraction loss

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The controller monitors traction loss indicators in real-time and adjusts the regenerative braking level based on feedback. When traction loss is detected, the controller reduces or modulates the braking level to prevent wheel lockup, while still maintaining effective deceleration through controlled braking application.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The braking level is dynamically adjusted based on rotational speed and traction conditions. At low rotational speeds where traction loss risk is higher, the system dynamically reduces the braking level or transitions to mechanical braking, while at higher speeds it applies higher regenerative braking levels for maximum deceleration efficiency.

Inventive Principle:

Principle #15Dynamics

3Loss of energy

If regenerative braking is used to bring vehicle to complete stop, then energy recapture is optimized, but braking consistency varies with weight and terrain conditions

Engineering Contradiction:

Improveenergy recapture efficiencyVSAvoidbraking behavior consistency

Core Design Contradiction:

Loss of energyVSStability of the object's composition

Solution Approach 1:

The system continuously monitors vehicle motion parameters including acceleration and roll back indicators to detect variations in braking performance. Based on this feedback, the controller adjusts the regenerative braking level to maintain consistent braking behavior across different weight conditions and terrain slopes, ensuring predictable vehicle stopping characteristics.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The controller modifies the regenerative braking parameter (braking level) based on detected vehicle conditions such as weight variations and terrain slope. By changing the braking parameter in response to these conditions, the system maintains consistent braking performance and predictable vehicle behavior despite external variable changes.

Inventive Principle:

Principle #35Parameter changes

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

Enhances the effectiveness of regenerative braking across different conditions, ensuring safe and consistent vehicle operation by dynamically adjusting braking levels to match deceleration needs and prevent traction loss, while also optimizing energy recapture.

Implementation Method 1

regenerative braking may be used to control the motion of the vehicle

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS11897366B2Methods and apparatuses for controlling an electric vehicle

Publication Date: 2024.02.13 ACCELERATED SYST

AI summary

There is provided a method for controlling an electric vehicle. The method includes receiving a regenerative braking activation indicator. If the regenerative braking activation indicator is affirmative, the method includes applying regenerative braking at an initial level to an electric motor of the electric vehicle. The method also includes obtaining a vehicle motion parameter of the electric vehicle measured when the regenerative braking is being applied. In addition, the method includes changing the regenerative braking to a modified level based on the vehicle motion parameter.