Electromechanical Brake Control Using DC Rear Motors and Central ECU

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Solution Overview

Problem

Conventional vehicle braking apparatuses are costly due to the use of BLDC motors in rear-wheel electromechanical brakes and require bulky separate ECUs, leading to increased manufacturing costs and space usage.

Innovation Solution

The use of DC motors instead of BLDC motors in rear-wheel electromechanical brakes, along with consolidating rear-wheel ECUs into a central ECU, reduces costs and minimizes space by eliminating the need for separate rear-wheel ECUs and shielded wire cables, thereby reducing electromagnetic interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If BLDC motors are used in rear-wheel electromechanical brakes, then braking performance is maintained, but manufacturing cost increases

Engineering Contradiction:

Improvebraking performanceVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the motor type parameter from BLDC to DC motor for rear-wheel electromechanical brakes. This parameter change reduces manufacturing cost while the control system compensates to maintain braking performance through optimized control strategies.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces expensive BLDC motors with cheaper DC motors in rear-wheel applications. DC motors are inherently less expensive to manufacture, and the system accepts this trade-off by using a centralized control approach to ensure overall braking performance.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Ease of operation

If separate rear-wheel ECUs are installed, then braking control is improved, but device complexity and space usage increase

Engineering Contradiction:

Improvebraking controlVSAvoidnumber of ECUs

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent merges the rear-wheel ECU functions into the front-wheel ECU. Instead of having separate control units for front and rear wheels, the system combines all braking control functions into a single ECU, reducing device complexity and space requirements while maintaining braking control capability through integrated control algorithms.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The front-wheel ECU is designed to perform multiple functions: controlling front-wheel brakes and also controlling rear-wheel brakes. This multi-functional approach eliminates the need for dedicated rear-wheel ECUs, reducing the overall number of control units in the system.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Object-affected harmful factors

If shielded wire cables are used for BLDC motor connections, then electromagnetic interference is reduced, but manufacturing cost increases

Engineering Contradiction:

Improveelectromagnetic interferenceVSAvoidmanufacturing cost

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent extracts and eliminates the need for expensive shielded wire cables by switching from BLDC to DC motors. DC motors generate less electromagnetic interference, allowing the use of simpler, less expensive wiring while still meeting electromagnetic compatibility requirements.

Inventive Principle:

Principle #2Taking out (Extraction)

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 lowers manufacturing costs and reduces the size of the braking apparatus by eliminating the need for separate rear-wheel ECUs and shielded wiring, while ensuring effective braking performance without electromagnetic interference.

Implementation Method 1

The rear-wheel EMB includes a DC motor and a rear-wheel brake configured to brake a rear wheel

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

a brake caliper installed with a motor-driven actuator to use the motor drive for braking the relevant vehicle directly

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS11827196B2Apparatus for vehicle braking

Publication Date: 2023.11.28 HYUNDAI MOBIS CO LTD

AI summary

The present disclosure in at least one embodiment provides an apparatus for braking a vehicle, including at least one sensor for detecting a braking input of the vehicle, a front-wheel EMB including a front-wheel motor and a front-wheel brake for braking a front wheel(s), a rear-wheel EMB including a rear-wheel motor and a rear-wheel brake for braking a rear wheel(s), a front-wheel ECU for controlling the front-wheel motor for allowing the front-wheel EMB to brake the front wheel, a center ECU for calculating and transmitting, upon receiving the braking input from the at least one sensor, a braking force to the front-wheel ECU, and controlling the rear-wheel motor for allowing the rear-wheel EMB to brake the rear wheel, and a battery for supplying electric power to the front-wheel ECU and the center ECU, wherein the front-wheel EMB is controlled by the front-wheel ECU, and the rear-wheel EMB is controlled by the center ECU.