Track-Mode Brake Control Using Higher Regenerative Torque

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Solution Overview

Problem

In track mode driving, vehicles experience issues with brake heat capacity, leading to fade and vapor lock phenomena due to insufficient heat dissipation from excessive friction braking, which can result in reduced braking force and stability.

Innovation Solution

An apparatus and method for controlling vehicle braking in track mode, which involves detecting a braking request and controlling the braking torque by combining regenerative braking torque and friction braking torque. The system increases regenerative braking torque to reduce friction braking torque, thereby preventing fade and vapor lock without increasing brake size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If friction braking torque is increased to provide sufficient braking force in track mode, then braking performance is improved, but brake heat capacity becomes insufficient leading to fade and vapor lock phenomena

Engineering Contradiction:

Improvebraking forceVSAvoidbrake temperature

Core Design Contradiction:

ForceVSTemperature

Solution Approach 1:

The patent combines regenerative braking and friction braking into a unified braking system that operates together. The controller integrates both braking mechanisms to share the braking torque requirement, where regenerative braking handles a portion of the deceleration demand and friction braking provides the remainder, thereby reducing the thermal burden on the brake while maintaining sufficient total braking force.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent dynamically changes the distribution ratio between regenerative braking torque and friction braking torque based on driving conditions, battery state of charge, and thermal status. By adjusting these parameters in real-time, the system optimizes the balance between braking performance and heat management, preventing brake overheating while ensuring adequate stopping power.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If brake size is increased to improve heat capacity, then fade and vapor lock phenomena are prevented, but vehicle weight and space requirements increase

Engineering Contradiction:

Improvebrake reliabilityVSAvoidbrake weight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent replaces a portion of the mechanical friction braking system with an electromagnetic regenerative braking system. The motor operates in regenerative mode to provide braking torque, substituting some of the mechanical brake function with an electromagnetic mechanism that does not generate heat in the same way, thereby reducing the required size and weight of the friction brake components while maintaining braking reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Use of energy by moving object

If regenerative braking torque is increased to reduce friction braking, then fuel efficiency is improved, but braking force distribution stability may be affected

Engineering Contradiction:

Improvefuel efficiencyVSAvoidbraking force distribution stability

Core Design Contradiction:

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

Solution Approach 1:

The patent implements a feedback control system that continuously monitors braking demand, regenerative braking capability, battery state of charge, and vehicle deceleration rate. The controller adjusts the regenerative braking torque in real-time based on this feedback, ensuring stable and smooth braking force distribution while maximizing energy recovery. The feedback mechanism prevents abrupt changes in braking force that could affect stability.

Inventive Principle:

Principle #23Feedback

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 maintains vehicle stability during rapid acceleration and deceleration in track mode, addresses the issue of insufficient brake heat capacity, and improves fuel efficiency by reducing the intervention of regenerative stability control during regenerative braking.

Implementation Method 1

a regenerative braking torque by a motor of the vehicle

Methodology Applied

Scientific EffectRegenerative braking: Electromagnetic Induction

Data Source

PatentUS12304356B2Apparatus, method and computer readable storage medium for controlling braking of vehicle

Publication Date: 2025.05.20 HYUNDAI MOTOR CO LTD

AI summary

A an apparatus of controlling a braking of a vehicle traveling in track mode includes a driving information detector configured to detect a braking request from a driver while the vehicle is driving; and a vehicle controller configured to, when the braking request is detected, control the braking of the vehicle according to a total required torque in response to the detected braking request, wherein the total required torque is a sum of a regenerative braking torque by a motor of the vehicle and a friction braking torque by a brake of the vehicle, wherein the vehicle controller is configured to decrease braking force by friction braking by relatively decreasing friction braking torque by increasing the regenerative braking torque of the total required torque, and wherein the regenerative braking torque is greater than a regenerative braking torque in non-track mode.