Vehicle Brake Valve Abnormality Detection via Master Piston Movement
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Solution Overview
Problem
The elimination of wheel pressure sensors in vehicle brake devices with brake-by-wire structures leads to difficulties in detecting valve abnormalities, potentially causing reservoir durability issues due to undetected leakage.
Innovation Solution
A vehicle brake device that detects valve abnormalities by monitoring the advance movement of the master piston in response to hydraulic pressure changes within the master chamber, eliminating the need for a wheel pressure sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a wheel pressure sensor is eliminated from the vehicle brake device with brake-by-wire structure, then the device complexity is reduced and cost is lowered, but the ability to detect valve abnormalities is lost
Solution Approach 1:
The master piston itself serves as the detection means by utilizing its own advance movement as an indicator of valve abnormality. The system uses the piston's natural response to pressure changes to detect problems without requiring external sensors.
Solution Approach 2:
The master piston acts as an intermediary element that translates valve abnormality into a measurable physical phenomenon (advance movement). This allows indirect detection of valve status through the piston's position change rather than directly measuring wheel cylinder pressure.
2Device complexity
If a wheel pressure sensor is eliminated, then the device complexity is reduced, but the reliability of reservoir protection is worsened due to undetected valve leakage
Solution Approach 1:
The system establishes a feedback mechanism where the master piston's advance movement provides information about valve leakage conditions. This feedback allows the control system to detect abnormalities and take protective actions to prevent reservoir damage.
Solution Approach 2:
The patent replaces the mechanical/electrical sensing system (wheel pressure sensor) with a hydraulic-based detection method utilizing the master piston's movement. This substitution maintains detection capability while simplifying the overall system architecture.
3Device complexity
If valve abnormality detection is performed using master piston advance movement, then the device complexity is reduced by eliminating sensors, but the measurement precision for detecting small leakage abnormalities may be affected
Solution Approach 1:
The system performs preliminary detection by monitoring master piston movement before significant leakage occurs. By detecting abnormalities early through piston position changes, the system can prevent progression to severe leakage that would compromise reservoir integrity.
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
Enables effective detection of valve abnormalities without a wheel pressure sensor, thereby preventing reservoir damage and ensuring proper brake function.
Implementation Method 1
generates a braking force at a wheel of a vehicle in response to a hydraulic pressure generated in a master chamber by a movement of a master piston
Data Source
AI summary
Provided is a brake device capable of detecting abnormality condition of a subject valve without using a wheel pressure sensor and the vehicle brake device includes a valve which is configured to open and close a fluid passage connected to the master chamber and at the same time which is a subject valve for a subject of failure judgement and an abnormality judging portion which is configured to judge whether or not the subject valve is in an abnormal state based on an advancement amount of the master piston accompanying an opening of the subject valve.