AWD Eco-Vehicle Braking Control Power Distribution
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Solution Overview
Problem
In all-wheel-drive (AWD) eco-friendly vehicles, there is a lack of effective regenerative braking distribution control between front and rear wheels, leading to reduced energy recovery efficiency and increased unnecessary hydraulic braking, which affects braking stability and regenerative braking efficiency.
Innovation Solution
A braking control method that determines a total braking force based on a driver's brake signal, calculates front and rear wheel braking forces, and optimally distributes power between the wheels using a controlled power distribution rate, ensuring both front/rear wheel braking and regenerative/frictional braking distribution during braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative braking is performed only on driving wheels in AWD vehicles, then the existing driving system is utilized, but regenerative braking efficiency is reduced and braking stability deteriorates
Solution Approach 1:
The braking system is segmented to apply regenerative braking independently to front and rear wheels based on their respective braking force requirements. The controller calculates and distributes regenerative braking force to each wheel separately, allowing optimized energy recovery while maintaining overall braking stability through independent wheel control.
2Force
If hydraulic braking is used to compensate for insufficient regenerative braking distribution, then braking force requirement is met, but energy recovery efficiency is reduced
Solution Approach 1:
The controller dynamically adjusts the regenerative braking force parameters for front and rear wheels based on real-time braking conditions, wheel speed, and braking force requirements. By optimizing the distribution parameters of regenerative braking force to each wheel, the system maximizes energy recovery efficiency while meeting the total braking force requirement and reducing unnecessary hydraulic braking intervention.
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 method improves braking stability and regenerative braking efficiency by ensuring optimal power distribution between the front and rear wheels, reducing regenerative braking losses and minimizing hydraulic braking, thereby enhancing overall braking performance.
Implementation Method 1
A regenerative braking system of the eco-friendly vehicle converts kinetic energy of the vehicle into electric energy and stores the energy in a battery while braking the vehicle
Implementation Method 2
a frictional braking torque generated in a brake device
Data Source
AI summary
A braking control method for a vehicle is provided. The vehicle distributes and transmits a driving force of a vehicle driving source to front and rear wheels based on a power distribution rate. The method includes determining a total braking force based on a brake signal corresponding to brake pedal manipulation, calculating a front and rear wheel braking force satisfying the total braking force, and calculating a regenerative and frictional braking force satisfying the total braking force. The method further includes determining a power distribution rate range to the front and rear wheels during braking using the calculated front and rear wheel braking force and regenerative braking force, determining a power distribution rate to the front and rear wheels based on a vehicle driving condition, within the determined power distribution rate range; and adjusting distribution of the power to the front and rear wheels at the power distribution rate.