Regenerative Braking Control for Low-Friction Road Stability
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Solution Overview
Problem
Regenerative braking in vehicles can lead to unstable vehicle behavior on certain road surfaces, such as icy or wet roads, due to the lack of feedback on road conditions, resulting in decreased driving stability and potential oversteer or understeer phenomena.
Innovation Solution
A regenerative braking control method that assesses the driving risk of a road surface using sensors like vision and rain sensors, external air temperature, and traction control system data to determine whether to perform regenerative braking, hydraulic braking, or a combination of both, ensuring driving stability by adjusting braking modes based on the detected risk and driver intent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If regenerative braking is performed without feedback on road surface and driving condition to maximize fuel efficiency improvement, then fuel efficiency is improved, but vehicle behavior becomes unstable and driving stability is degraded
Solution Approach 1:
The patent implements feedback control by continuously monitoring road surface conditions through sensors (vision sensors detecting road color, rain sensors detecting precipitation, temperature sensors) and adjusting regenerative braking activation accordingly. The controller determines driving risk based on sensor feedback and selectively activates or deactivates regenerative braking to maintain stability while optimizing fuel efficiency.
Solution Approach 2:
The system changes the operational parameters of regenerative braking based on detected road conditions. When high driving risk is detected (icy, snowy, or wet roads), the controller deactivates regenerative braking or reduces its intensity. When low risk is detected (dry roads), the controller activates regenerative braking at full capacity, thus adapting the braking parameters to environmental conditions.
2Power
If regenerative braking is performed on icy road surface, then electricity is generated through counter electromotive force, but friction coefficient becomes extremely low and lock phenomenon occurs at driveshaft causing vehicle behavior to deviate from driver intent
Solution Approach 1:
The system performs preliminary detection of road surface conditions using vision sensors, rain sensors, and temperature sensors before initiating regenerative braking. When icy or snowy conditions are detected in advance, the controller preemptively deactivates regenerative braking to prevent lock phenomenon and maintain vehicle controllability, rather than waiting for instability to occur.
Solution Approach 2:
The controller acts as an intermediary between the regenerative braking system and the road surface conditions. It mediates by selectively activating or deactivating regenerative braking based on sensor input, thus protecting the vehicle from the harmful effects of low-friction road surfaces while still allowing electricity generation when conditions permit.
3Productivity
If regenerative braking is activated to charge electricity during accelerator pedal release, then fuel efficiency is improved, but on low friction road surfaces vehicle behavior becomes unstable
Solution Approach 1:
The system dynamically adjusts regenerative braking activation based on real-time road surface conditions. The controller continuously monitors environmental parameters and changes the operational state of regenerative braking from active to inactive or vice versa, optimizing both electricity charging efficiency and vehicle behavior stability according to current driving 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
The method enhances driving stability by preventing unintended braking on hazardous surfaces and optimizing regenerative braking to maintain vehicle control while improving fuel efficiency.
Implementation Method 1
a vehicle using a motor as a driving source may perform regenerative braking to charge electricity by generating a counter electromotive force at the motor
Implementation Method 2
a color detecting operation of determining a driving risk of the vehicle driving on the road surface on the basis of a measured value of a vision sensor of the vehicle which detects a color of the road surface
Implementation Method 3
a rain detecting operation of determining a driving risk of the vehicle driving on the road surface on the basis of a measured value of a rain sensor of the vehicle which detects rainwater
Implementation Method 4
a friction coefficient of an icy road surface becomes extremely low and thus a lock phenomenon temporarily occurs at a driveshaft
Data Source
AI summary
A regenerative braking control method of a vehicle, may include a first operation of determining a driving risk of a road surface on the basis of a status of the road surface while driving; a second operation of determining whether an accelerator pedal is released while driving; a third operation of determining whether a brake pedal is operated while driving; and a fourth operation of performing no regenerative braking when the accelerator pedal is determined as being released, the driving risk of the road surface is determined as being high, and when the brake pedal is determined as not being operated.