Redundant Brake Circuit Layout With Quiet Cut-Off Valve Switching
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Solution Overview
Problem
Conventional brake systems lack silence and redundancy, which can compromise safety during emergencies.
Innovation Solution
A brake system with two hydraulic pressure suppliers and a cut-off valve that connects and separates hydraulic circuits based on operating modes, including a normal operating mode, emergency mode, and pressure balancing mode, to ensure silence and redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional brake system with a single hydraulic pressure supplier is used, then the device complexity is reduced, but the reliability decreases because there are no redundant components to take over in case of failure
Solution Approach 1:
The brake system is divided into two independent hydraulic circuits (first and second hydraulic circuits), each with its own hydraulic pressure supplier. This segmentation allows one circuit to fail independently without affecting the other, providing redundancy and improved safety while maintaining manageable system complexity through modular design
Solution Approach 2:
Different parts of the system have different functions: the first hydraulic pressure supplier pressurizes the first hydraulic circuit, while the second hydraulic pressure supplier pressurizes the second hydraulic circuit. The cut-off valve selectively connects or disconnects these circuits based on operating mode, allowing local optimization of reliability without requiring full system redundancy in all conditions
2Reliability
If the cut-off valve remains open to connect both hydraulic circuits, then redundancy is improved for emergency mode, but noise increases due to continuous fluid flow and valve operation
Solution Approach 1:
The cut-off valve dynamically changes its state based on the operating mode: it remains closed during normal operation to minimize noise, and opens during emergency mode or pressure balancing mode to enable redundancy. This dynamic adaptation allows the system to optimize both noise reduction and reliability at different times without compromise
Solution Approach 2:
The cut-off valve operates periodically or event-driven rather than continuously, opening only when emergency mode or pressure balancing is detected and closing during normal operation. This periodic action minimizes the time the valve is open, thereby reducing noise generation from fluid flow while maintaining redundancy when needed
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 achieves enhanced safety through redundant components that can take over in case of failures and maintains silence by minimizing noise from valves.
Implementation Method 1
a first hydraulic pressure supplier including an actuator for pressurizing the first hydraulic circuit in a normal operating mode, a second hydraulic pressure supplier including an actuator for pressurizing the second hydraulic circuit in the normal operating mode
Implementation Method 2
the cut-off valve is a solenoid valve
Data Source
AI summary
Brake system for a vehicle is provided, comprising a first hydraulic circuit including a first wheel brake, a second hydraulic circuit including a second wheel brake, a first electromechanical brake assembly including a third wheel brake, a second electromechanical brake assembly including a fourth wheel brake, a first hydraulic pressure supplier including an actuator for pressurizing the first hydraulic circuit, a second hydraulic pressure supplier including an actuator for pressurizing the second hydraulic circuit, a first control unit configured to activate the first hydraulic pressure supplier and the second hydraulic pressure supplier and control the first electromechanical brake assembly and the second electromechanical brake assembly, depending on a brake request, and a second control unit configured to activate the first hydraulic pressure supplier and the second hydraulic pressure supplier and control the first electromechanical brake assembly and the second electromechanical brake assembly, depending on a brake request.