Hybrid Brake System Segmentation for Energy and Response
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Solution Overview
Problem
The existing brake systems for hybrid vehicles, which combine hydraulic and regenerative brake devices, lack efficiency in energy regeneration and responsiveness due to the need for coordinated control of braking forces, particularly in prioritizing energy regeneration over user demands.
Innovation Solution
A brake system configuration where the hydraulic brake device provides braking force to one wheel, the electric brake device to the other, and the regenerative brake device to either, with a controller managing the overall braking force by adjusting the electric and regenerative brake devices to exclude hydraulic braking when possible, ensuring optimal energy efficiency and responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the braking force is controlled by coordinating hydraulic and regenerative brake devices to prioritize energy regeneration, then energy efficiency is improved, but responsiveness and practical utility deteriorate
Solution Approach 1:
The brake system is segmented into three independent brake devices (hydraulic, electric, and regenerative), each capable of providing braking force to different wheels. This segmentation allows the controller to selectively activate specific brake devices based on driving conditions, enabling rapid response by directly engaging the electric brake device when immediate braking is needed, while prioritizing regenerative braking for energy recovery during appropriate conditions.
Solution Approach 2:
The brake system dynamically adjusts the contribution of each brake device based on real-time conditions. The controller monitors wheel speeds, vehicle state, and braking requirements to dynamically determine the optimal combination of hydraulic, electric, and regenerative braking forces, allowing the system to transition between energy-efficient regenerative braking and responsive electric/hydraulic braking as needed.
2Reliability
If the hydraulic brake device is controlled to provide braking force, then braking reliability is improved, but energy efficiency deteriorates due to reduced regenerative braking
Solution Approach 1:
Different brake devices are applied to different wheels based on local conditions. The controller can apply regenerative braking to wheels with optimal conditions for energy recovery while using electric or hydraulic braking on other wheels when immediate reliability is needed, allowing simultaneous optimization of both energy efficiency and braking reliability across different parts of the vehicle.
3Loss of energy
If the regenerative brake device is prioritized for energy recovery, then energy efficiency is improved, but braking responsiveness deteriorates
Solution Approach 1:
The electric brake device serves as a preliminary action mechanism that can be instantly activated to provide immediate braking force when rapid response is required, while the regenerative brake device handles the remaining braking requirement for energy recovery. This preliminary action by the electric brake device eliminates the time delay associated with regenerative braking activation, ensuring rapid response while maintaining energy efficiency.
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 configuration allows for excellent braking force response and high energy efficiency by maximizing regenerative braking when overall braking force is below a threshold, while ensuring sufficient braking force is maintained through the hydraulic system when needed.
Implementation Method 1
a regenerative brake device configured to give a braking force utilizing electric power generation by rotation of the wheel
Implementation Method 2
a hydraulic brake device configured to give a braking force in accordance with an operation of the brake operation member to one of the front wheel and the rear wheel, by a pressure of a working fluid
Data Source
AI summary
A brake system for a vehicle, including: a brake operation member; a hydraulic brake device configured to give a braking force based on an operation of the brake operation member; an electric brake device configured to give a braking force generated by an electric actuator; a regenerative brake device configured to give a braking force utilizing electric power generation by rotation of a wheel, and a controller configured to determine insufficient braking force by excluding the braking force by the hydraulic brake device from a required overall braking force required for the vehicle as a whole and to control the braking force by each of the electric brake device and the regenerative brake device based on the insufficient braking force, wherein the brake system is configured such that the hydraulic brake device gives the braking force when the required overall braking force exceeds a threshold.