ESC Brake Control for Inner Wheel Slip Prevention

Solution Overview

Problem

During vehicle turning, the differential gear causes slippage at the inner wheel, leading to insufficient driving force transfer to the outer wheel, which existing mechanical devices like limited slip differentials (LSD) attempt to address but increase vehicle cost and weight, and require complex layout changes and development costs.

Innovation Solution

A brake control system using an electronic stability control (ESC) system to adjust braking pressure of the inner wheel based on preset conditions, determining and controlling the braking pressure to prevent slippage without the need for a mechanical device like an LSD, thereby transferring driving force to the outer wheel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a mechanical device such as a limited slip differential (LSD) is used to prevent slippage, then the driving force transfer is improved, but the vehicle cost and weight increase

Engineering Contradiction:

Improvedriving force transferVSAvoidvehicle weight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent replaces the mechanical LSD system with an electronic control system that uses the existing brake mechanism. The controller monitors wheel speeds and applies braking force to the inner wheel through the brake system, eliminating the need for mechanical differential devices while achieving the same slip prevention effect.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent extracts the slip prevention function from the mechanical differential system and implements it separately through electronic control of the brake system. This allows the use of a simpler, lighter brake-based solution while maintaining the essential function of preventing inner wheel slippage during turns.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If a mechanical device such as a limited slip differential (LSD) is used to prevent slippage, then the driving force transfer is improved, but the vehicle cost increases

Engineering Contradiction:

Improvedriving force transferVSAvoidvehicle cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces the mechanical LSD system with an electronic control system that uses the existing brake mechanism. The controller monitors wheel speeds and applies braking force to the inner wheel through the brake system, eliminating the need for mechanical differential devices while achieving the same slip prevention effect.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent makes the brake system perform multiple functions: normal braking and slip prevention during turns. By controlling the brake mechanism to apply force to the inner wheel during turning operations, the system uses an existing component for dual purposes, reducing overall system cost.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If a mechanical device including a clutch is used to prevent slippage, then the driving force transfer is improved, but the layout change is necessary

Engineering Contradiction:

Improvedriving force transferVSAvoidlayout complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the slip prevention function from the mechanical differential system and implements it separately through electronic control of the brake system. This allows the use of a simpler, lighter brake-based solution while maintaining the essential function of preventing inner wheel slippage during turns.

Inventive Principle:

Principle #2Taking out (Extraction)

4Reliability

If a mechanical device is used to prevent slippage, then the driving force transfer is improved, but the development cost increases

Engineering Contradiction:

Improvedriving force transferVSAvoiddevelopment cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent makes the brake system perform multiple functions: normal braking and slip prevention during turns. By controlling the brake mechanism to apply force to the inner wheel during turning operations, the system uses an existing component for dual purposes, reducing overall system cost.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 reduces vehicle cost and weight, eliminates the need for complex layout changes, and enhances driving performance by ensuring maximum driving force transfer during turns and drift maneuvers without the use of mechanical devices, providing a dynamic driving experience.

Implementation Method 1

controlling braking pressure by determining and adjusting a braking pressure control amount of an inner wheel during vehicle turning

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS20220258707A1System and method of controlling brake of vehicle

Publication Date: 2022.08.18 HYUNDAI MOTOR CO LTD

AI summary

A brake control system and method are arranged to control a brake for preventing slip and ensuring driving force of an outer wheel by adjusting a braking amount of an inner wheel during vehicle turning. The method includes steps of: receiving, by an electronic stability control (ESC) device, a function activation request; determining, by the ESC device, whether execution conditions for brake control of a turning inner wheel of a vehicle are satisfied in response to the function activation request, and when the execution conditions are satisfied, controlling braking pressure by determining and adjusting a braking pressure control amount of an inner wheel during vehicle turning based on a preset factor.