Electronic Braking System with Segmented Hydraulic Circuits

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Solution Overview

Problem

Conventional electronic braking systems face challenges in stably distributing braking pressure during regenerative braking, leading to issues like oversteering, understeering, and reduced driving stability, and they may fail to reliably generate hydraulic pressure due to technical errors or part failures.

Innovation Solution

The electronic braking system employs a hydraulic pressure supplier with a dual-pressure chamber mechanism and a hydraulic controller with multiple flow paths and valves to manage hydraulic pressure distribution to wheel cylinders, allowing for stable operation in normal, regenerative, and abnormal modes, and includes a backup system to ensure braking even with part errors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If regenerative braking is implemented to retrieve energy during braking, then energy efficiency is improved, but braking force distribution becomes unstable causing oversteering, understeering, or slippage

Engineering Contradiction:

Improveenergy retrieval rateVSAvoidbraking force distribution stability

Core Design Contradiction:

Use of energy by moving objectVSStability of the object's composition

Solution Approach 1:

The braking system is divided into two independent hydraulic circuits (first hydraulic circuit for wheels with generators, second hydraulic circuit for wheels without generators). This segmentation allows differential braking pressure control between the two circuits, enabling stable braking force distribution while maintaining regenerative braking functionality. The hydraulic controller can independently adjust pressure in each circuit to prevent oversteering and understeering.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If electronic braking control is used to implement various braking functions, then braking versatility is improved, but system reliability deteriorates due to technical errors or part failures in electric components

Engineering Contradiction:

Improvebraking function versatilityVSAvoidbraking system reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system incorporates a backup mechanism where the master cylinder is mechanically coupled to the brake pedal, providing a direct hydraulic pressure generation path that operates independently of the electronic hydraulic pressure supplier. This backup cushioning ensures that even if the electronic components fail, the braking system can still function through the mechanical backup path, thereby maintaining reliability while preserving electronic braking versatility.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Force

If hydraulic pressure is applied to all wheel cylinders during regenerative braking, then braking force is improved, but load on components increases reducing durability

Engineering Contradiction:

Improvebraking forceVSAvoidcomponent durability

Core Design Contradiction:

ForceVSDuration of action of stationary object

Solution Approach 1:

The system applies different braking pressures to different wheels based on their local conditions. Wheels equipped with generators receive reduced hydraulic pressure to allow regenerative braking, while wheels without generators receive full hydraulic pressure. This local quality differentiation optimizes overall braking force while reducing the load on the hydraulic pressure supplier and other components, thereby improving durability.

Inventive Principle:

Principle #3Local quality

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 solution enables stable and reliable braking pressure distribution across all wheels, enhances driving stability, and maintains high braking performance while reducing the load on components, improving durability and reliability.

Implementation Method 1

a hydraulic pressure supplier configured to create hydraulic pressure by moving a hydraulic piston movably contained in a cylinder block based on an electric signal output to correspond to displacement of a brake pedal

Methodology Applied

Scientific EffectElectric signal actuation:

Implementation Method 2

a hydraulic controller configured to have a first hydraulic circuit controlling hydraulic pressure transferred to two wheel cylinders and a second hydraulic circuit controlling hydraulic pressure transferred to other two wheel cylinders

Methodology Applied

Scientific EffectHydraulic pressure transmission: Hydraulic Press

Data Source

PatentUS10821953B2Electric braking system and operation method thereof

Publication Date: 2020.11.03 HL MANDO CORP

AI summary

Disclosed is an electronic braking system and operation method thereof. The electronic braking system and operation method thereof includes a hydraulic pressure supplier configured to create hydraulic pressure by moving a hydraulic piston based on an electric signal output to correspond to displacement of a brake pedal, and a hydraulic controller configured to control hydraulic pressure of a pressure medium applied to each wheel cylinder, and performs normal operation mode, abnormal operation mode, regenerative braking mode, and check mode by controlling a plurality of valves equipped in the hydraulic controller.