EV Brake Control with Speed-Up Regenerative Deceleration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing brake control systems for electric vehicles are unable to decelerate the vehicle quickly enough through regenerative braking when the service brake fails to provide sufficient braking force.
Innovation Solution
A brake control apparatus that includes a speed change process unit to increase the rotation speed of the electric motor relative to the drive wheels during regenerative braking, allowing for faster deceleration, and additional units for overcharge prevention, emergency brake operation, and deceleration control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If regenerative braking is operated with direct coupling between electric motor and drive wheels, then the system structure is simple, but the deceleration speed is insufficient
Solution Approach 1:
The patent embeds a speed change mechanism (transmission system) within the regenerative braking system. The electric motor is coupled to drive wheels through a transmission that includes speed change gears, allowing the motor rotation speed to be increased relative to wheel rotation speed during regenerative braking, thereby achieving faster deceleration while maintaining a relatively compact integrated structure
2Use of energy by moving object
If regenerative braking is operated to maximize energy recovery, then battery charging efficiency is improved, but battery overcharge may occur
Solution Approach 1:
The patent incorporates a control mechanism that monitors battery charge state and provides feedback to the regenerative braking system. When the battery reaches a predetermined charge level, the control unit adjusts or terminates regenerative braking operation, preventing overcharge while maximizing energy recovery during appropriate conditions
3Reliability
If service brake is relied upon for stopping, then the braking system is simple, but braking force may be insufficient when service brake fails
Solution Approach 1:
The patent makes the regenerative braking system serve dual functions: it acts as an energy recovery mechanism during normal operation and as an emergency braking system when service brake fails. This multi-functionality ensures reliable braking force availability without adding a completely separate emergency braking mechanism
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 apparatus enables faster deceleration of the vehicle through regenerative braking, prevents battery overcharge, ensures braking force is maintained even when the service brake fails, and reduces the impact on vehicle occupants by controlling deceleration within a safe threshold.
Implementation Method 1
obtains a braking force by regenerative braking of the electric motor while charging the battery
Implementation Method 2
a speed change process unit configured to increase a rotation speed of the electric motor with respect to a rotation speed of the drive wheels
Data Source
AI summary
Provided is a brake control apparatus of an automobile that drives drive wheels by an electric motor to which electric power is supplied from a battery and obtains a braking force by regenerative braking of the electric motor while charging the battery, including: a speed change process unit configured to increase a rotation speed of the electric motor with respect to a rotation speed of the drive wheels when operating the regenerative braking.