Occupant-Adaptive Regenerative Braking Torque Control in EVs
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Solution Overview
Problem
Existing regenerative braking systems in electric vehicles fail to efficiently adjust regenerative braking torque based on changes in vehicle weight, such as the number and positions of occupants, leading to potential damage to the motor or battery and inadequate energy recovery.
Innovation Solution
A regenerative braking torque control system that adjusts motor torque responsiveness based on the number and positions of occupants within the vehicle, using sensors to detect in-vehicle information and apply a scoring system to determine motor torque responsiveness, thereby optimizing regenerative braking torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative braking torque is increased to improve energy recovery, then energy recovery efficiency is improved, but motor or battery damage may occur when not controlled according to vehicle weight changes
Solution Approach 1:
The regenerative braking torque is dynamically adjusted based on real-time detection of occupant number and position, which reflect vehicle weight changes. The controller continuously modifies the torque magnitude to match current vehicle conditions, transitioning from fixed torque control to adaptive dynamic control, thereby preventing motor or battery damage while maximizing energy recovery.
Solution Approach 2:
The system changes the regenerative braking torque parameter according to detected vehicle weight conditions (occupant number and position). By varying the torque parameter based on these conditions, the system optimizes energy recovery efficiency while preventing excessive torque that could damage the motor or battery, thus resolving the contradiction between energy recovery and component safety.
2Device complexity
If regenerative braking torque is fixed at a predetermined ratio, then system complexity is reduced, but energy recovery efficiency decreases when vehicle weight changes
Solution Approach 1:
The system automatically detects occupant number and position, calculates appropriate regenerative braking torque based on vehicle weight conditions, and adjusts torque without driver intervention. This self-service approach eliminates the need for manual torque adjustment while optimizing energy recovery efficiency according to real-time vehicle conditions, resolving the contradiction between control simplicity and energy efficiency.
Solution Approach 2:
The system implements feedback control by detecting vehicle weight conditions (occupant number and position) and using this information to adjust regenerative braking torque. The feedback loop continuously monitors conditions and modifies torque accordingly, enabling adaptive energy recovery optimization without significantly increasing system complexity, thus resolving the contradiction between simple control and efficient energy recovery.
3Object-affected harmful factors
If regenerative braking torque is sharply reduced to prevent occupant discomfort, then occupant comfort is improved, but energy recovery efficiency decreases
Solution Approach 1:
The system performs preliminary detection of occupant number and position before regenerative braking activation. Based on this advance information, the controller pre-calculates appropriate torque magnitude and adjustment rate, preventing excessive torque application that would cause occupant discomfort. This preliminary action enables comfortable braking while maintaining energy recovery efficiency by optimizing torque from the start rather than requiring sharp reductions.
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 system allows for differentiated motor torque responses, reducing the impact on occupants and preventing carsickness by gradually adjusting regenerative braking torque based on occupant presence and position, enhancing energy recovery and vehicle safety.
Implementation Method 1
regenerative braking is a braking method of generating power by operating a motor as a generator and returning the generated power to a power supply
Data Source
AI summary
A regenerative braking torque control system of an electric vehicle, includes a travel information setting section selects a regenerative braking level in response to a driver's input and setting at least one driving mode among a plurality of driving modes, an in-vehicle information detector which detects in-vehicle information corresponding to a number and in-vehicle positions of occupants seated on vehicle seats, and a controller which allows driving to be performed according to the regenerative braking level selected by the travel information setting section, the controller transferring motor torque responsiveness according to the number and the in-vehicle positions of the occupants detected by the in-vehicle information detector to a motor controller for driving the vehicle by reflecting the motor torque responsiveness on regenerative braking torque.