Regenerative Braking Torque Control to Prevent Brake Lamp Flicker
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Solution Overview
Problem
In electrified vehicles equipped with smart regenerative braking systems, the frequent turn-on and turn-off of the brake lamp due to accelerator pedal manipulation during regenerative braking leads to a flickering phenomenon, causing inconvenience and potentially degrading driving safety for following vehicles.
Innovation Solution
A regenerative braking control method that determines the number of brake lamp turn-on/off times during a reference period based on the travel environment and adjusts the regenerative braking torque of the drive motor accordingly, limiting the regenerative braking torque variation rate and lowering the predetermined regenerative braking level to prevent unnecessary brake lamp activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If smart regenerative braking system activates brake lamp during regenerative braking when acceleration is lower than reference value, then energy recovery efficiency is improved, but brake lamp flickering occurs causing driver inconvenience and safety risks
Solution Approach 1:
The patent applies dynamics by making the regenerative braking control adaptive to changing driving conditions. The control unit dynamically adjusts regenerative braking activation and brake lamp control based on real-time parameters including accelerator pedal manipulation state, vehicle speed, and acceleration. This dynamic control prevents brake lamp flickering by suppressing regenerative braking when the accelerator pedal is manipulated, while maintaining energy recovery efficiency during appropriate regenerative braking conditions.
Solution Approach 2:
The patent implements feedback control by continuously monitoring driving state parameters (accelerator pedal position, vehicle speed, acceleration) and using this information to adjust regenerative braking control and brake lamp activation. The control unit receives feedback about the current driving condition and modifies the regenerative braking torque accordingly, preventing unnecessary brake lamp activation while maintaining energy recovery when appropriate.
2Loss of energy
If regenerative braking torque is increased to enhance energy recovery, then fuel economy is improved, but brake lamp turn-on/off frequency increases causing flickering phenomenon
Solution Approach 1:
The patent applies parameter changes by modifying the regenerative braking torque based on detected driving conditions. When the accelerator pedal is manipulated during regenerative braking, the control unit adjusts the regenerative braking torque parameter to prevent excessive deceleration that would trigger brake lamp activation. This maintains energy recovery efficiency while preventing brake lamp flickering by keeping deceleration within acceptable ranges.
3Productivity
If regenerative braking is frequently activated and deactivated during driving, then energy recovery opportunity is increased, but brake lamp flickering is caused reducing driving comfort
Solution Approach 1:
The patent applies preliminary action by proactively preventing brake lamp flickering before it occurs. The control unit monitors the accelerator pedal manipulation state in advance and suppresses regenerative braking activation when pedal manipulation is detected, thereby preventing the conditions that would lead to brake lamp flickering. This maintains driving comfort while still allowing energy recovery during appropriate 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 method reduces the flickering of the brake lamp and enhances driving safety by maintaining the brake lamp in a consistent state, ensuring smoother vehicle acceleration and reducing driver distraction and safety risks for rear vehicles.
Implementation Method 1
regenerative braking is performed to recover energy generated during braking of the vehicle or coasting of the vehicle by inertia, through electricity generation of a drive motor
Implementation Method 2
the stored energy, for driving of the drive motor
Data Source
AI summary
An electrified vehicle and a regenerative braking control method of the same include performing regenerative braking based on a travel environment while driving of the vehicle, determining the number of turn-on/off times of a brake lamp for a reference time during execution of the regenerative braking based on the travel environment, and adjusting a regenerative braking torque of a drive motor based on the determined number of turn-on/off times of the brake lamp.