Vehicle Braking Torque Distribution for Regenerative Energy
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Solution Overview
Problem
Existing vehicle braking systems face challenges in achieving both vehicle stability during braking and maximizing regenerative energy, particularly in coordinating the distribution of braking forces between front and rear wheels to ensure rapid and effective energy regeneration.
Innovation Solution
A braking control device that includes an actuator to apply front and rear wheel torques and a controller to adjust these torques dynamically, prioritizing rear wheel torque increase when regenerative braking force reaches its maximum before increasing front wheel torque, ensuring optimal distribution of braking forces for stability and energy regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If regenerative braking force is maximized, then energy regeneration is improved, but braking force distribution between front and rear wheels becomes unbalanced affecting vehicle stability
Solution Approach 1:
The braking force is segmented into three components: regenerative braking force (Fg) applied to the wheel with the generator, and friction braking forces (Fmf, Fmr) applied to front and rear wheels respectively. This segmentation allows independent control of each braking component to achieve both maximum energy regeneration and proper force distribution for vehicle stability.
Solution Approach 2:
Different braking strategies are applied to different wheels based on their specific functions. The wheel with the generator prioritizes regenerative braking, while front and rear wheels receive friction braking forces calculated to maintain optimal braking force distribution ratios, ensuring vehicle stability during maximum energy regeneration.
2Stability of the object's composition
If braking force distribution is adjusted rapidly, then vehicle stability is improved, but response time for achieving optimal distribution ratio may be insufficient
Solution Approach 1:
The control device pre-calculates the optimal braking force distribution ratio before braking occurs. During braking, the friction braking forces are immediately adjusted according to this predetermined ratio, eliminating the need for gradual adjustment and achieving optimal distribution from the start of braking, thus preventing vehicle instability without time loss.
3Force
If friction braking force is increased to compensate for insufficient regenerative braking, then total braking force is improved, but energy regeneration efficiency decreases
Solution Approach 1:
The control device continuously maintains the regenerative braking force at its maximum possible value throughout the braking process. Friction braking forces are then added to compensate for any shortfall to achieve the required total braking force, ensuring that energy regeneration efficiency is maximized continuously while still meeting the total braking force requirement.
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
The solution enables rapid achievement and maintenance of desired braking force distribution ratios, maximizing regenerative energy and ensuring vehicle stability by strategically adjusting front and rear wheel torques based on regenerative braking force levels.
Implementation Method 1
a regenerative generator (GN) provided on a front wheel (WHf)... a regenerative braking force (Fg) generated by the regenerative generator (GN)
Implementation Method 2
an actuator (YU) that applies a front wheel torque (Tqf) that causes the front wheel (WHf) to generate a front wheel friction braking force (Fmf)
Data Source
AI summary
A vehicle includes a regenerative generator on a front wheel. A braking control device includes an actuator that applies a front wheel torque and a rear wheel torque, and a controller that individually adjusts the front wheel torque and the rear wheel torque. The controller is configured to determine the front wheel torque and the rear wheel torque to zero when a regenerative braking force Fg generated by the regenerative generator has not reached a maximum regenerative force Fx which is a generatable maximum value. On the other hand, the controller is configured to increase the rear wheel torque from zero before increasing the front wheel torque from zero when the regenerative braking force Fg reaches the maximum regenerative force Fx.