Brake Controller Regenerative Distribution for Hybrid Stability

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Solution Overview

Problem

In hybrid vehicles, existing braking systems face challenges in efficiently distributing brake force between friction and regenerative braking systems to maximize kinetic energy recapture while ensuring vehicle stability.

Innovation Solution

A braking distribution system and method that calculates and allocates front and rear regenerative braking requests based on available braking amounts, using a brake controller to determine optimal regenerative and friction braking torque distribution, ensuring balanced brake force application.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If regenerative braking is maximized to increase kinetic energy recapture, then energy efficiency is improved, but vehicle stability may be compromised due to uneven brake force distribution between axles

Engineering Contradiction:

Improvekinetic energy recaptureVSAvoidvehicle stability

Core Design Contradiction:

Use of energy by moving objectVSStability of the object's composition

Solution Approach 1:

The patent applies local quality by distributing regenerative braking torque differently between front and rear axles based on their specific braking capabilities and requirements. The brake controller calculates and allocates regenerative braking requests separately for each axle, allowing optimized local brake force application that maintains overall vehicle stability while maximizing energy recapture.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system dynamically adjusts brake force distribution between friction and regenerative braking systems based on real-time conditions. The brake controller continuously calculates available regenerative braking amounts and base braking distributions, then dynamically allocates torque to maintain stability while maximizing energy recovery under varying operating conditions.

Inventive Principle:

Principle #15Dynamics

2Stability of the object's composition

If friction braking is used to ensure vehicle stability, then braking control is improved, but kinetic energy recapture is reduced

Engineering Contradiction:

Improvevehicle stabilityVSAvoidkinetic energy recapture

Core Design Contradiction:

Stability of the object's compositionVSUse of energy by moving object

Solution Approach 1:

The patent applies partial action by using friction braking only to the extent necessary to maintain vehicle stability and complete the braking request. The brake controller calculates base braking distributions and compares them with available regenerative braking amounts, applying friction braking partially to supplement regenerative braking where needed rather than relying on it exclusively.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The brake controller acts as an intermediary that coordinates between the friction braking system and regenerative braking system. It calculates optimal distributions and allocates brake force requests to both systems, mediating their interaction to achieve both stability and energy recovery goals simultaneously.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Use of energy by moving object

If regenerative braking torque is increased on one axle to maximize energy recovery, then kinetic energy recapture is improved, but brake force balance between axles deteriorates

Engineering Contradiction:

Improvekinetic energy recaptureVSAvoidbrake force balance

Core Design Contradiction:

Use of energy by moving objectVSStability of the object's composition

Solution Approach 1:

The system changes the parameter of brake force distribution by calculating and allocating different regenerative braking torque amounts to front and rear axles based on their specific capabilities. The brake controller adjusts the distribution parameters dynamically, optimizing energy recovery while maintaining brake force balance between axles through separate calculation and allocation for each axle.

Inventive Principle:

Principle #35Parameter changes

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 enhances vehicle stability and maximizes kinetic energy recapture by optimizing the distribution of brake force between regenerative and friction braking systems, improving overall braking efficiency.

Implementation Method 1

The energy from the rotation of the one or more wheels turns a motor that can charge the battery

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

braking is accomplished with a friction braking system

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS7322659B2Method and system for brake distribution in a regenerative braking system

Publication Date: 2008.01.29 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

A braking distribution system is provided for system with a front regenerative braking system and a rear regenerative braking system. The system comprises a brake controller coupled to the front regenerative braking system and the rear regenerative braking system, and the brake controller is configured to receive a braking request, a first amount of braking that is available from the front regenerative braking system, and a second amount of braking that is available from the rear regenerative braking system. The controller is also configured to calculate a front base braking based at least in part on the braking request and a front base braking distribution, calculate a rear base braking based at least in part on the braking request and a rear base braking distribution, and determine a front regenerative braking request and a rear regenerative braking request based on the first amount and the second amount.