Vehicle Brake Motor Control for Vibration

Solution Overview

Problem

Existing vehicle brake apparatuses consume excessive power and wear out quickly due to continuous inverted phase motor control to counter abnormal vibrations caused by disc rotor thickness variations, necessitating expensive motors and higher manufacturing costs.

Innovation Solution

A vehicle brake apparatus that employs a motor controlling mechanism to execute vibration restricting control only when detection value variation frequency exceeds specific thresholds, allowing for reduced power consumption and motor wear by controlling the motor in inverted phase only when necessary, and in-phase when the variation frequency is within a non-damaging range.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the motor is continuously controlled in inverted phase to counter abnormal vibrations, then abnormal vibration is prevented, but power consumption increases and motor wear accelerates

Engineering Contradiction:

Improveabnormal vibrationVSAvoidpower consumption

Core Design Contradiction:

Object-affected harmful factorsVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic action by monitoring vibration frequency continuously and applying inverted phase motor control only when the vibration frequency exceeds a predetermined threshold. This conditional periodic control eliminates continuous motor operation, thereby reducing power consumption and motor wear while still preventing abnormal vibrations when they occur

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent employs feedback control by detecting the actual vibration frequency of the brake pad against the disc rotor and using this information to adjust motor control in real-time. The control system compares detected vibration frequency with threshold values and dynamically switches between normal braking mode and vibration compensation mode, optimizing power usage while maintaining vibration prevention

Inventive Principle:

Principle #23Feedback

2Object-affected harmful factors

If the motor is continuously controlled in inverted phase to counter abnormal vibrations, then abnormal vibration is prevented, but motor wear increases

Engineering Contradiction:

Improveabnormal vibrationVSAvoidmotor durability

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent implements periodic action by monitoring vibration frequency continuously and applying inverted phase motor control only when the vibration frequency exceeds a predetermined threshold. This conditional periodic control eliminates continuous motor operation, thereby reducing power consumption and motor wear while still preventing abnormal vibrations when they occur

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system monitors its own operational state through vibration detection and automatically adjusts motor control accordingly. By detecting when vibration compensation is actually needed and activating only in those conditions, the system serves itself to optimize both vibration prevention and motor durability

Inventive Principle:

Principle #25Self-service

3Object-affected harmful factors

If high frequency vibration control is implemented, then abnormal vibration is prevented, but expensive high-response motors are required

Engineering Contradiction:

Improveabnormal vibrationVSAvoidmanufacturing cost

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent implements periodic action by monitoring vibration frequency continuously and applying inverted phase motor control only when the vibration frequency exceeds a predetermined threshold. This conditional periodic control eliminates continuous motor operation, thereby reducing power consumption and motor wear while still preventing abnormal vibrations when they occur

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent applies parameter changes by establishing frequency threshold criteria that determine when vibration compensation should be activated. By monitoring vibration frequency and comparing it against predetermined thresholds, the system dynamically adjusts control parameters to activate compensation only when necessary, avoiding the need for expensive high-response motors capable of continuous high-frequency operation

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8985283B2Vehicle brake apparatus

Publication Date: 2015.03.24 ADVICS CO LTD

AI summary

A vehicle brake apparatus capable of preventing abnormal vibration due to thickness variations in a disc rotor includes a motor drive unit configured to control the motor which presses the brake pad against the disc rotor, a brake pressure detection unit for detecting a braking pressure for pressing the brake pad, and a wheel speed sensor for detecting a rotation speed of the disc rotor. If an amount of variation in the detection values detected by the brake pressure detection unit during one rotation of the disc rotor exceeds a variation amount determination threshold value and a detection value variation frequency has a correlation with the rotation speed of the disc rotor and the detection value variation frequency exceeds a variation frequency determination threshold value, the motor drive unit controls the motor in inverted phase to the variation in the detection values.