Vehicle Brake Control Apparatus Vibration Suppression

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Solution Overview

Problem

Vehicle brake systems experience noise and vibration issues like brake squeal and judder due to resonance in frictional brake devices, which existing technologies fail to effectively mitigate without compromising ride comfort or braking efficiency.

Innovation Solution

A vehicle brake control apparatus that includes a vibration detector, power regeneration execution determination unit, pressing force controller, and driving force cooperative controller, which detects vibrations and adjusts brake fluid pressure and driving force to suppress fluctuations and mitigate noise and vibration, while managing power regeneration to maintain optimal braking performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If power regeneration is executed during braking, then energy recovery efficiency is improved, but vibration and noise in the frictional brake device increases due to resonance

Engineering Contradiction:

Improveenergy recovery efficiencyVSAvoidvibration and noise

Core Design Contradiction:

Loss of energyVSObject-affected harmful factors

Solution Approach 1:

The invention converts the harmful vibration and resonance effects into a beneficial control signal. When vibration is detected in the frictional brake device during power regeneration braking, the control unit adjusts the regenerative braking force to suppress the resonance, thereby eliminating the harmful effect while maintaining energy recovery efficiency

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The invention implements a feedback control mechanism where vibration sensors continuously monitor the frictional brake device during braking. The control unit receives vibration signals and automatically adjusts the regenerative braking force in real-time to suppress resonance, creating a closed-loop control system that eliminates vibration while maintaining energy recovery

Inventive Principle:

Principle #23Feedback

2Object-affected harmful factors

If pressing force of friction material is increased to suppress vibration, then ride comfort is improved, but braking efficiency deteriorates due to excessive force application

Engineering Contradiction:

Improveride comfortVSAvoidbraking efficiency

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The invention dynamically adjusts the regenerative braking force based on real-time vibration detection rather than using fixed pressing force. The control unit continuously modifies the braking force to maintain optimal levels for both comfort and efficiency, avoiding the excessive force application that would occur with static high-force settings

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the regenerative braking force parameter in response to detected vibration conditions. By adjusting this parameter dynamically rather than maintaining a constant high pressing force, the system achieves both improved ride comfort and maintained braking efficiency

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If regenerative braking force is adjusted to suppress vibration, then vibration control is improved, but fluctuation in vehicle deceleration increases affecting ride comfort

Engineering Contradiction:

Improvevibration controlVSAvoiddeceleration stability

Core Design Contradiction:

Object-affected harmful factorsVSStability of the object's composition

Solution Approach 1:

The invention uses the power generation device as a counterbalancing element to offset vibration in the frictional brake device. By adjusting the regenerative braking force in opposition to detected vibration, the system suppresses resonance while the control algorithm maintains overall deceleration stability through coordinated force management

Inventive Principle:

Principle #8Anti-weight (Counterweight)

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 system effectively reduces occupant discomfort and noise by adjusting brake fluid pressure and driving force, improving ride comfort and braking efficiency by suppressing vibrations and fluctuations in deceleration, even when power regeneration is limited or not feasible.

Implementation Method 1

a vibration detector configured to detect a predetermined vibration state in the frictional brake device

Methodology Applied

Scientific EffectVibration detection:

Implementation Method 2

a friction material to be pressed against a rotating body... A frictional force is then generated between the rotating body and the friction material. A braking force is thus obtained.

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS11285951B2Vehicle brake control apparatus

Publication Date: 2022.03.29 SUBARU CORP

AI summary

A vehicle brake control apparatus includes a vibration detector configured to detect a predetermined vibration state in a frictional brake device, a power regeneration execution determination unit configured to determine, in a case where the predetermined vibration state is detected by the vibration detector, whether to permit execution of power regeneration by a power generating device or to limit the execution, a pressing force controller configured to change, in a case where the execution of the power regeneration is limited by the power regeneration execution determination unit, a pressing force of a friction material in the frictional brake device, and a driving force cooperative controller configured to adjust a driving force of a vehicle to suppress fluctuation in forward acceleration or backward acceleration of the vehicle associated with a change in the pressing force by the pressing force controller.