Three-Way Valve Leak Detection via Pressure Reduction Monitoring
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Solution Overview
Problem
Current vehicle brake systems face challenges in detecting leaks in three-way valves, which can lead to reduced braking performance and stability, especially under adverse conditions, due to the complexity of hydraulic circuits and the need for precise pressure control.
Innovation Solution
A diagnostic method is introduced that uses a pedal simulator and a dual module design to identify leaks in three-way valves by monitoring pressure reduction rates, allowing for efficient detection and communication of leaks to the vehicle user interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake system uses complex hydraulic circuits with multiple three-way valves for precise pressure control, then braking performance and stability are improved, but the difficulty of detecting leaks in the valves increases
Solution Approach 1:
A diagnostic valve is introduced as an intermediary component to facilitate leak detection in the three-way valves. The diagnostic valve includes a diagnostic port that can be connected to a pressure source, allowing controlled pressurization of specific hydraulic circuits. This intermediary device enables isolated testing of individual three-way valves without requiring complex system-wide diagnostic equipment, thereby reducing the difficulty of leak detection while maintaining the complex hydraulic circuit architecture for braking performance.
2Ease of manufacture
If the brake system isolates the master cylinder in a separate module, then packaging space is reduced and ease of manufacture is improved, but the complexity of the hydraulic circuit increases
Solution Approach 1:
The brake system is segmented into separate modules: a first module containing the master cylinder and a second module containing the three-way valves and diagnostic components. This segmentation allows independent manufacturing and assembly of each module, simplifying production processes and enabling easier replacement or maintenance of specific components. The modular design reduces packaging space during manufacturing while the standardized connection interfaces between modules help manage the complexity of the hydraulic circuit through clear separation of functions.
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 method enables effective identification of leaks in three-way valves, improving braking system reliability and stability by providing a straightforward diagnostic process that can be integrated into existing brake systems, enhancing vehicle safety and performance.
Implementation Method 1
monitoring a pressure medium flow through the three-way valve to the second wheel brake and the third wheel brake and determining whether there is a pressure reduction in the pressure medium flow
Data Source
AI summary
A diagnostic method to identify a leak in a three-way valve for a vehicle brake system having a remote master cylinder which includes the steps of: (1) providing a pedal simulator having pressure medium; (2) de-energizing a secondary three-way valve; (3) retracting a dual acting plunger to the home position to drop the pressure in the boost circuit to zero while also monitoring the pressure at the output of a fluid separator via a secondary master cylinder pressure sensor; (4) determining a rate of pressure reduction at the output of a fluid separator via a secondary master cylinder pressure sensor; and (5) identifying a leak in at least one of a primary three-way valve and the secondary three way valve if the rate of pressure reduction is equal to or higher than a pre-determined rate.