Regenerative Brake Control Unit Axle Torque Distribution
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Solution Overview
Problem
Conventional braking systems for vehicles face limitations in efficiently converting kinetic energy into electrical energy during deceleration, leading to reduced fuel efficiency and increased pollutant emissions, while also compromising vehicle stability due to uniform hydraulic pressure distribution across axles.
Innovation Solution
A control device that independently sets hydraulic pressures for the front and rear axles, allowing for optimal distribution of braking torque and utilizing electric motors to convert kinetic energy into electrical energy, ensuring vehicle stability and efficient energy recovery by selectively controlling electromechanical plungers, shutoff valves, and pumps within the braking system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If uniform hydraulic pressure is distributed across all wheel brake cylinders, then the braking system is simple to control, but the braking torque distribution cannot be optimized for each axle, reducing vehicle stability and energy recovery efficiency
Solution Approach 1:
The brake circuit is divided into front and rear sections, allowing independent pressure control for each axle. This segmentation enables optimized braking torque distribution while maintaining system simplicity through modular control architecture.
Solution Approach 2:
Different hydraulic pressures are applied to front and rear wheel brake cylinders based on specific braking conditions. This local quality adjustment optimizes braking torque distribution for each axle, improving vehicle stability and energy recovery efficiency without complicating overall system control.
2Device complexity
If hydraulic pressure is reduced simultaneously in all wheel brake cylinders, then the control mechanism is simplified, but the ability to maintain optimal braking torque distribution between front and rear axles is lost
Solution Approach 1:
The brake circuit is segmented into front and rear control zones with independent pressure regulation capabilities. This allows precise control of braking torque distribution while keeping the overall circuit design relatively simple and manageable.
Solution Approach 2:
The brake system employs dynamic pressure control where hydraulic pressures for front and rear axles can be independently adjusted based on real-time braking conditions. This dynamic adaptation enables precise braking torque distribution without requiring an overly complex fixed-pressure system.
3Device complexity
If only front axle generator braking torque is applied, then the control system is simpler, but the energy recovery efficiency is reduced
Solution Approach 1:
The brake circuit integrates both front and rear axle generator braking torques into a unified energy recovery system. This merging of front and rear axle regenerative braking capabilities maximizes kinetic energy conversion to electrical energy while maintaining manageable control system complexity through coordinated control.
Solution Approach 2:
The brake system is designed to universally apply generator braking torque on both front and rear axles, enabling the system to perform multiple functions (energy recovery from all wheels) through a integrated control approach that does not significantly increase system complexity.
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 solution enables rapid charging of vehicle batteries, reduces fuel consumption, decreases pollutant emissions, and maintains desired braking torque distribution, ensuring good vehicle stability and efficient energy recovery during deceleration.
Implementation Method 1
a front axle generator braking torque is exerted on a front axle of the vehicle with the aid of an electric motor
Data Source
AI summary
A control device for a recuperative braking system of a vehicle includes: an actuating device configured to (i) select the maximum value of a front axle generator braking torque and of a rear axle generator braking torque, taking into account at least one provided default variable concerning a setpoint total braking torque which is predefined by a driver, (ii) control an electric motor, and (iii) control a hydraulic front axle brake circuit component and a hydraulic rear axle brake circuit component in such a way that a front axle brake pressure and a rear axle brake pressure are settable in such a way that a difference between a predefined setpoint braking torque distribution and an actual braking torque distribution present between the front axle and the rear axle is minimized.