Vehicle Braking Control System with Dual Battery Energy Storage
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Solution Overview
Problem
Conventional braking systems in eco-friendly vehicles are limited in regenerative braking torque due to reliance on the chargeable capacity of the main battery, requiring additional hydraulic brake assist when regenerative braking torque is reduced, necessitating a separate apparatus.
Innovation Solution
A braking control system that includes a motor, a high-voltage main battery, a low-voltage auxiliary battery, an inverter, and a DC converter, with a controller that calculates and adjusts regenerative braking torque based on both batteries' chargeable energy and braking conditions to maximize regenerative braking torque without additional hydraulic assist.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If regenerative braking torque is determined based only on the chargeable capacity of the main battery, then the main battery can be charged during braking, but the regenerative braking torque is limited and cannot be increased further
Solution Approach 1:
The patent combines the main battery and auxiliary battery into a unified energy storage system for regenerative braking. The controller manages both batteries simultaneously, allowing regenerative energy to be distributed to both batteries based on their chargeable capacities, thereby increasing the overall regenerative braking torque beyond what a single battery could provide.
Solution Approach 2:
The auxiliary battery, originally designed only for providing power to electric components, is given a dual function by also serving as an energy storage device for regenerative braking. This multi-functionality allows the system to increase regenerative braking capacity without adding entirely new components.
2Use of energy by moving object
If regenerative braking torque is reduced, then the main battery charging rate decreases, but additional hydraulic brake assist apparatus is required to maintain required braking torque
Solution Approach 1:
The patent merges the hydraulic brake system with the regenerative braking system by introducing a brake assist apparatus that activates when regenerative braking torque is insufficient. This integrated approach allows the system to maintain required braking torque by combining regenerative braking and hydraulic braking, eliminating the need for a separate auxiliary apparatus.
Solution Approach 2:
The controller continuously monitors the regenerative braking torque and compares it with the required braking torque. When regenerative braking torque falls below the required level, the controller automatically activates the brake assist apparatus to supplement the braking force, ensuring the total braking torque meets the driver's demand.
3Reliability
If a separate auxiliary apparatus is added to increase hydraulic brake torque, then the required braking torque can be maintained, but the device complexity and cost increase
Solution Approach 1:
The auxiliary battery is given a dual function: powering electric components and storing regenerative braking energy. This multi-functionality allows the system to maintain reliable braking torque through enhanced regenerative braking without requiring additional dedicated auxiliary apparatus for braking assistance.
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
Enhances regenerative braking torque while maintaining constant braking torque without additional hydraulic brake assist, improving fuel efficiency by effectively utilizing both batteries for energy storage and regeneration.
Implementation Method 1
an inverter connected to the first battery via a direct current (DC) link terminal and configured to perform a bidirectional power conversion between the DC link terminal and the motor
Implementation Method 2
a direct current (DC) converter connected to the DC link terminal to down-convert a voltage of the DC link terminal and output the down-converted voltage
Implementation Method 3
charge regenerative braking energy generated from the motor during braking of the vehicle in the first battery and the second battery
Data Source
AI summary
A braking control system for a vehicle is provided. The system includes a motor providing rotational force to wheels of the vehicle and a first battery storing electric energy for driving the motor. An inverter is connected to the first battery via a DC link terminal and performs a bidirectional power conversion between the DC link terminal and the motor. A DC converter is connected to the DC link terminal to down-convert a voltage of the DC link terminal and output the down-converted voltage. A second battery is supplied with the voltage converted by the DC converter and has a voltage lower than that of the first battery. A controller operates the inverter and the DC converter to charge regenerative braking energy generated from the motor during braking of the vehicle in the first battery and the second battery.