Brake Force Distribution Control for Parallel and Diagonal Vehicle Motion

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Solution Overview

Problem

Conventional vehicle brake systems fail to dynamically adjust brake force distribution in various drive modes, leading to unstable vehicle behavior, particularly in modes like parallel moving, diagonal moving, and in-situ turn, due to fixed brake force ratios that do not account for steering and deceleration changes.

Innovation Solution

A vehicle brake force distribution control apparatus that adjusts brake forces based on steering amount and longitudinal/lateral deceleration, using a controller to calculate variable brake force distribution ratios and weight transfer ratios, and corrects hydraulic pressures to ensure each wheel follows a target brake force, employing feed forward and feedback controls to stabilize vehicle behavior.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a fixed brake force distribution ratio (6:4) is used for front and rear wheels, then the brake system is simple to control, but vehicle behavior becomes unstable in special drive modes (parallel moving, diagonal moving, in-situ turn) due to weight transfer and steering changes

Engineering Contradiction:

Improvebrake control simplicityVSAvoidvehicle behavior stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The brake force distribution ratio is changed from fixed to dynamic, allowing it to vary based on driving conditions. The controller calculates and adjusts the brake force distribution ratio in real-time according to the drive mode, steering angle, and deceleration rate, ensuring stable vehicle behavior in special modes while maintaining simple brake pedal operation for the driver.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The brake force distribution ratio parameter is changed dynamically based on driving conditions. The system adjusts this parameter according to the selected drive mode (parallel moving, diagonal moving, in-situ turn), steering angle, and deceleration rate, transforming the static 6:4 ratio into a variable parameter that adapts to different operating conditions.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If brake force distribution is not adjusted for different drive modes, then the brake system maintains consistent performance, but vehicle behavior becomes unpredictable during weight transfer in special modes

Engineering Contradiction:

Improvebrake force consistencyVSAvoidvehicle behavior stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The system implements feedback control by continuously monitoring the actual brake force applied to each wheel and comparing it with the target brake force calculated based on the current drive mode and conditions. The controller adjusts the brake force distribution ratio in real-time to minimize the difference between actual and target brake forces, ensuring both consistency and stability.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The controller pre-calculates the target brake force for each wheel based on the selected drive mode, steering angle, and deceleration rate before actual braking occurs. This preliminary calculation allows the system to proactively adjust brake force distribution to prevent unstable vehicle behavior rather than reacting after instability occurs.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If the brake force distribution ratio is dynamically adjusted based on steering and deceleration, then vehicle behavior stability improves in special modes, but the control system complexity increases

Engineering Contradiction:

Improvevehicle behavior stabilityVSAvoidbrake control system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The brake control system is designed to handle multiple drive modes (parallel moving, diagonal moving, in-situ turn, and normal driving) through a single unified controller that dynamically adjusts brake force distribution. This multi-functional approach avoids the need for separate brake control systems for each mode, reducing overall system complexity while maintaining stability across all modes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Ease of manufacture

If a single brake force ratio is applied to all wheels, then the brake system is easy to manufacture, but it cannot accommodate weight transfer and steering changes in special drive modes

Engineering Contradiction:

Improvebrake system manufacturing simplicityVSAvoidbrake force adaptability

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250346215A1Vehicle brake force distribution control apparatus and method therefor

Publication Date: 2025.11.13 HYUNDAI MOTOR CO LTD

AI summary

A vehicle brake force distribution control apparatus is provided, having a manipulation unit selecting at least one of a parallel moving mode, a diagonal moving mode, and an in-situ turn mode, a brake pedal detection unit detecting a brake pedal open value to predict a target deceleration in the parallel moving mode or diagonal moving mode, and a sensor that outputs steering amount information and longitudinal/lateral deceleration information. The vehicle brake force distribution control apparatus additionally includes a controller that distributes a brake force of each wheel in the parallel moving mode or the diagonal moving mode according to the target deceleration, corrects the brake force of each wheel on the basis of the steering amount information and the longitudinal/lateral deceleration information, and allows a real brake force of each wheel to follow a corrected target brake force in the parallel moving mode or the diagonal moving mode.