Regenerative Brake Control Using Active Shift for Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electric motored vehicles face a challenge in regenerative brake efficiency due to the need for frequent adjustment of the motor driving point during regeneration, which can lead to a sense of driving unfamiliarity and conflicts with drivability and fuel efficiency.
Innovation Solution
A regenerative brake method that allows drivers to select from various modes, including efficiency-preferred and drivability-preferred modes, using active shift control (ASC) to optimize gear shifts and motor speed control, thereby enhancing regenerative efficiency while minimizing driving point adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the motor driving point is frequently adjusted during regeneration to increase regenerative efficiency, then regenerative efficiency is improved, but a sense of driving unfamiliarity is generated
Solution Approach 1:
The patent implements dynamic gear shift control during regenerative braking by introducing an Active Shift Control (ASC) function that automatically adjusts gear stages based on real-time motor speed and torque conditions. The ECU dynamically determines optimal gear shifts to maintain the motor operating point within a high regenerative efficiency range, thereby resolving the contradiction between maximizing energy recovery and maintaining driving familiarity through automated adaptive control
Solution Approach 2:
The patent changes the gear ratio parameter dynamically during regeneration by controlling gear stage transitions. The ECU calculates optimal gear shifts based on motor speed and torque parameters, adjusting the transmission ratio to keep the motor operating point within the high regenerative efficiency region, thus improving energy recovery without requiring direct driver intervention
2Loss of energy
If gear ratio is changed discontinuously during regeneration to adjust motor driving point, then regenerative efficiency is improved, but drivability is degraded
Solution Approach 1:
The patent implements a feedback control mechanism where the ECU continuously monitors motor speed and torque during regenerative braking, compares the actual operating point with the target high-efficiency region, and automatically triggers gear shifts when deviations are detected. This closed-loop feedback ensures the motor remains in the optimal regenerative efficiency range while maintaining smooth drivability through automated compensation
Solution Approach 2:
The system performs self-adjustment of gear ratios during regeneration through the ASC function, automatically determining and executing optimal gear shifts without driver input. The ECU serves the dual purpose of maximizing regenerative efficiency and maintaining drivability by autonomously managing transmission control based on real-time operating 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 increases regenerative efficiency and drivability by allowing drivers to choose between modes that prioritize efficiency or drivability, reducing the sense of unfamiliarity and improving overall vehicle performance.
Implementation Method 1
performs regenerative brake of charging a battery by recovering kinetic energy of a vehicle as electric energy through power generation of an electric motor during brake
Data Source
AI summary
The present disclosure provides a regenerative brake method of a vehicle, including selecting and inputting one of a plurality of regenerative brake modes by a driver and recognizing the regenerative brake mode selected by the driver, by a controller, determining on/off-state of an active shift control (ASC) function by the controller when the regenerative brake mode selected by the driver is an efficiency-preferred mode or an intermediate mode, controlling a motor speed during regenerative brake and simultaneously performing ASC control for changing a gear stage, by the controller when the ASC function is in the on-state, and controlling gear shift for changing a gear stage without control of a motor speed during regenerative brake, by the controller when the ASC function is in the off-state.