Dual-Circuit Brake Hydraulics for Failure Isolation and Pressure Backup
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Solution Overview
Problem
Existing vehicle braking devices struggle to generate appropriate braking force in the event of failures such as electrical failures or liquid leakage in one system, particularly when the other system is affected.
Innovation Solution
A vehicle braking device with a configuration that includes a first hydraulic pressure output unit connected to a master cylinder, a hydraulic pressure generating unit, a communication control valve, and a master cut valve, allowing independent hydraulic pressure output to wheel cylinders through multiple pathways and controlling communication between these pathways to maintain braking force even in failure scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two systems of wheel cylinders are connected in consideration of occurrence of a failure, then the reliability of the braking device is improved, but the device complexity increases
Solution Approach 1:
The braking system is divided into two independent hydraulic systems (first system with master cylinder and first wheel cylinders, second system with hydraulic pressure generating unit and second wheel cylinders). This segmentation allows each system to operate independently, ensuring that a failure in one system does not affect the other, thereby maintaining braking force generation reliability while managing complexity through modular design.
Solution Approach 2:
A communication passage with a communication control valve is introduced as an intermediary between the first and second hydraulic systems. This intermediary enables selective hydraulic pressure communication between systems based on operational conditions, allowing the system to switch between normal dual-system operation and failure-mode single-system operation, thus resolving the contradiction between reliability and complexity.
2Adaptability or versatility
If a communication passage connects the first liquid passage and the second liquid passage, then the adaptability of the hydraulic system is improved, but the risk of liquid leakage propagation increases
Solution Approach 1:
The communication control valve is designed as a dynamically controllable component that can switch between open and closed states based on system conditions. In normal operation, the valve is open to allow hydraulic pressure communication between systems for enhanced adaptability. Upon detecting liquid leakage or failure, the valve closes to isolate the affected system, preventing liquid leakage propagation while maintaining the dynamic flexibility needed for various operational modes.
3Ease of operation
If electromagnetic valves are used to control hydraulic passages, then the ease of operation is improved, but the dependency on electrical power increases
Solution Approach 1:
The system incorporates redundancy in the form of two independent hydraulic systems with the capability to operate independently. This beforehand cushioning ensures that if electrical power fails and electromagnetic valves become inoperative, the system can still function using the master cylinder and first hydraulic system, thus reducing dependency on electrical power while maintaining ease of operation through automated valve control under normal conditions.
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 device ensures appropriate braking force generation by isolating affected systems and redirecting hydraulic pressure through alternative pathways, maintaining functionality even in cases of failure or liquid leakage.
Implementation Method 1
a communication control valve provided in a communication passage connecting the first liquid passage and the second liquid passage, the communication control valve being a normally closed electromagnetic valve that opens and closes the communication passage
Implementation Method 2
a master cut valve that is a normally open electromagnetic valve provided on the first liquid passage on a master cylinder side relative to a connection portion with the communication passage
Implementation Method 3
a hydraulic pressure generating unit that generates a hydraulic pressure independently of the master cylinder
Data Source
AI summary
A vehicle braking device includes: a first hydraulic pressure output unit that is connected to a master chamber through a first liquid passage and outputs hydraulic pressure to first wheel cylinders based on a hydraulic pressure of the first liquid passage; a hydraulic pressure generating unit that generates hydraulic pressure independently of a master cylinder; a second hydraulic pressure output unit that is connected to the hydraulic pressure generating unit through a second liquid passage and outputs hydraulic pressure to second wheel cylinders based on a hydraulic pressure of the second liquid passage; a normally closed communication control valve that is provided in a communication passage connecting the first liquid passage and the second liquid passage and opens and closes the communication passage; and a normally open master cut valve in the first liquid passage on the master cylinder side relative to a connection portion with the communication passage.