Braking Control System for Environmental-Friendly Vehicles
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Solution Overview
Problem
Environmental-friendly vehicles face reduced battery life and increased hydraulic brake disk wear due to concentrated braking loads when regenerative braking is prohibited at maximum battery charge, leading to 100% hydraulic braking and subsequent disk temperature increase and weight/cost issues.
Innovation Solution
A braking control system and method that forcibly discharge a part of the battery charge when it reaches maximum, allowing regenerative braking to continue, thereby combining regenerative and hydraulic braking to distribute the load and prevent 100% hydraulic braking pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If regenerative braking is prohibited when battery charge amount reaches maximum, then battery life is protected from overcharge deterioration, but braking load concentrates on hydraulic brake disk causing temperature increase and reduced disk life
Solution Approach 1:
The system performs preliminary discharge control before regenerative braking occurs. When the battery charge amount reaches maximum, the system proactively discharges a predetermined amount of charge through the motor or auxiliary devices, creating charge capacity in advance to prevent regenerative braking prohibition and subsequent disk overload.
Solution Approach 2:
The system changes the battery charge parameter dynamically by controlling discharge amount based on predicted regenerative braking energy. The discharge control unit adjusts the charge amount to be discharged according to predicted values from the predicting unit, optimizing the balance between battery protection and braking system load distribution.
2Ease of operation
If 100% hydraulic brake pressure is used when regenerative braking is prohibited, then braking function is maintained, but braking load concentrates on disk requiring larger disk size which increases weight and cost
Solution Approach 1:
The system performs preliminary discharge control before regenerative braking occurs. When the battery charge amount reaches maximum, the system proactively discharges a predetermined amount of charge through the motor or auxiliary devices, creating charge capacity in advance to prevent regenerative braking prohibition and subsequent disk overload.
3Ease of operation
If 100% hydraulic brake pressure is used when regenerative braking is prohibited, then braking function is maintained, but disk temperature increases significantly reducing disk life
Solution Approach 1:
The system performs preliminary discharge control before regenerative braking occurs. When the battery charge amount reaches maximum, the system proactively discharges a predetermined amount of charge through the motor or auxiliary devices, creating charge capacity in advance to prevent regenerative braking prohibition and subsequent disk overload.
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 approach reduces the braking load on hydraulic brake disks, prolongs their life, and decreases the need for larger disks, thus reducing weight and cost, while maintaining efficient battery management.
Implementation Method 1
a regenerative braking mode for recovering braking and inertia energy of the vehicle upon traveling by braking or inertia of the vehicle through power generation in the motor to charge it in the battery
Implementation Method 2
traveling and charging a battery by using a motor
Data Source
AI summary
A braking control system and a braking control method for an environmental-friendly vehicle may forcibly discharge a part of the current charge amount of a battery when it is determined that the current charge amount of the battery reaches a maximum charge amount state by regenerative braking to exclude a regenerative braking prohibition condition according to the maximum charge amount state of the battery. The braking of the vehicle is thereby always performed by a sum of the regenerative braking amount and the hydraulic braking amount to reduce a braking load concentrated on a disk of a hydraulic braking brake.