EV Brake Lamp Control During Regenerative Coasting Deceleration
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Solution Overview
Problem
In electric vehicles equipped with regenerative braking systems, the brake lamp may not be turned on promptly enough when decelerating, potentially leading to accidents due to reduced visibility of following vehicles, especially in vehicles with wedge-shaped designs that have limited rear visibility.
Innovation Solution
A method and system for controlling the brake lamp in electric vehicles, which involves determining the position of a following vehicle during regenerative braking and adjusting the ON threshold for the brake lamp or controlling the regenerative braking torque based on the vehicle's distance from the rear of the electric vehicle, thereby ensuring timely activation of the brake lamp.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative braking is used for deceleration in electric vehicles, then energy recovery efficiency is improved, but brake lamp activation timing is delayed
Solution Approach 1:
The system determines the position of following vehicles in advance during regenerative braking and pre-adjusts the brake lamp ON threshold or regenerative braking torque based on the distance to following vehicles, ensuring the brake lamp activates timely without waiting for standard deceleration thresholds to be met
Solution Approach 2:
The system dynamically changes the ON threshold parameter for the brake lamp based on the distance to following vehicles detected during regenerative braking, allowing the brake lamp to activate at lower deceleration levels when following vehicles are present, thus resolving the timing delay while maintaining energy recovery efficiency
2Use of energy by moving object
If wedge-shaped vehicle design is adopted, then aerodynamic performance is improved, but rear visibility for following vehicles is reduced
Solution Approach 1:
The system uses rear sensors to detect the presence and distance of following vehicles, providing feedback that triggers adaptive brake lamp control, compensating for the reduced rear visibility caused by the wedge-shaped design and enhancing safety without compromising aerodynamic performance
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 proposed solution effectively induces following vehicles to maintain a safe distance by ensuring timely activation of the brake lamp, even at low deceleration levels, thus enhancing safety and compliance with lighting standards.
Implementation Method 1
when braking, the kinetic energy of the vehicle may be converted into electrical energy to perform braking by operating the motor along with an existing hydraulic friction brake as a generator. This type of braking is referred to as regenerative braking.
Implementation Method 2
performing at least one of correction of an ON threshold according to deceleration or control of regenerative braking torque for deceleration variation if the following vehicle is located in one of a plurality of regions set according to a distance from a rear of the electric vehicle
Data Source
AI summary
An embodiment method of controlling a brake lamp of a vehicle equipped with an electric motor as a power source includes determining a position of a following vehicle when decelerating through regenerative braking in a coasting situation and performing at least one of correction of an ON threshold according to deceleration or control of regenerative braking torque for deceleration variation in response to the determined position of the following vehicle being in one of a plurality of regions set according to a distance from a rear of the vehicle.