Electronic Brake Hydraulics With Redundant ECU Circuit Isolation
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Solution Overview
Problem
Conventional electronic brake systems are prone to instability and component failure due to reliance on a single electronic control unit, which can lead to inadequate hydraulic pressure generation during braking, compromising passenger safety.
Innovation Solution
An electronic brake system with dual hydraulic circuits and separate electronic control units, integrating a master cylinder and simulation apparatus to provide redundant control and ensure stable braking even in case of unit failure, featuring a hydraulic pressure supply device, master cylinder, and backup flow paths to maintain braking functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single electronic control unit is used to control the hydraulic pressure supply device, then the device complexity is reduced, but the reliability deteriorates because the system becomes inoperable when the electronic control unit fails
Solution Approach 1:
The hydraulic brake system is divided into two independent hydraulic circuits (first hydraulic circuit and second hydraulic circuit), each controlled by a separate electronic control unit. This segmentation allows one circuit to continue functioning even if the other fails, thereby improving reliability while maintaining manageable system complexity through modular architecture
Solution Approach 2:
The system configuration changes from a single centralized control unit to multiple distributed control units, fundamentally altering the system's architectural parameters. This parameter change enables fault isolation and continued operation of critical braking functions under failure conditions
2Reliability
If dual hydraulic circuits with separate electronic control units are implemented, then the reliability is improved through redundant control, but the device complexity increases
Solution Approach 1:
The master cylinder is designed to integrate multiple chambers (first master chamber and second master chamber) into a single component that serves both hydraulic circuits. This merging approach reduces the number of separate components needed, thereby limiting the increase in device complexity while maintaining the reliability benefits of dual independent circuits
3Device complexity
If the master cylinder and simulation apparatus are integrated into one component, then the device complexity is reduced and manufacturing cost decreases, but the manufacturing precision requirements increase
Solution Approach 1:
The master cylinder and simulation apparatus are merged into a single integrated component with shared housing and coordinated internal chambers. This consolidation reduces the total number of discrete parts, simplifies assembly procedures, and lowers manufacturing costs while the modular chamber design manages the complexity of integration precision requirements
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
The system reduces component count, enhances reliability, and ensures stable braking performance across various operating conditions, including component failures, while simplifying assembly and reducing manufacturing costs.
Implementation Method 1
a hydraulic pressure supply device configured to generate a hydraulic pressure by operating a hydraulic piston in response to a signal from a pedal displacement sensor detecting a displacement of a brake pedal
Implementation Method 2
a master cylinder provided with at least one chamber and piston to pressurize and discharge the fluid, configured to provide a pedal feel in connection with the brake pedal
Data Source
AI summary
The present disclosure relates to an electronic brake system and an operation method thereof. The electronic brake system includes a reservoir in which a fluid is stored, a hydraulic pressure supply device configured to generate a hydraulic pressure by operating a hydraulic piston in response to a signal from a pedal displacement sensor detecting a displacement of a brake pedal, a hydraulic control unit including a first hydraulic unit configured to control the hydraulic pressure to be transferred from the hydraulic pressure supply device to a first hydraulic circuit including two wheel cylinders, and a second hydraulic unit configured to control the hydraulic pressure to be transferred from the hydraulic pressure supply device to a second hydraulic circuit including other two wheel cylinders.