Brake Pressure Reducing Valve Failure Detection by Circuit Pressure Change
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Solution Overview
Problem
Existing brake systems face difficulty in identifying which pressure reducing valve has a mechanical failure, leading to issues with braking pressure release.
Innovation Solution
A method for detecting pressure reducing valve failures in a brake system by monitoring circuit pressure changes and piston position during different pressurization modes, using threshold values to identify specific valve failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple pressure reducing valves are used in the brake system, then the reliability of pressure reduction is improved, but the difficulty of detecting and measuring which valve has failed increases
Solution Approach 1:
The brake system is divided into multiple pressurization modes (first, second, and third modes), with each mode associated with specific pressure reducing valves. By segmenting the pressure reduction function across different modes and analyzing pressure change patterns specific to each mode, the system can identify which specific valve has failed without requiring direct measurement of each individual valve.
2Ease of manufacture
If pressure reducing valves are made mechanically simple, then the ease of manufacture is improved, but the reliability of pressure reduction function deteriorates when mechanical sticking occurs
Solution Approach 1:
The system continuously monitors pressure changes in the brake circuit and compares them against expected pressure change ranges for different pressurization modes. This feedback mechanism allows the control unit to detect when a pressure reducing valve fails to open properly due to mechanical sticking, and subsequently switch to an alternative pressurization mode to maintain braking functionality.
3Adaptability or versatility
If the brake system uses multiple pressurization modes, then the adaptability to handle valve failures is improved, but the device complexity increases
Solution Approach 1:
The brake system dynamically switches between different pressurization modes based on real-time pressure change analysis. The control unit adjusts the operating mode according to the detected failure condition, enabling the system to adapt to valve failures without requiring complex mechanical redundancy or additional hardware components.
Data Source
AI summary
Disclosed is a failure detection method of a pressure reducing valve of a brake system. The failure detection method of a pressure reducing valve of a brake system includes: moving, when performing a pressure reducing operation of a brake system, a pump piston by controlling a motor of the brake system; calculating a circuit pressure change amount of the brake system in response to the performing of the pressure reducing operation; and determining that a failure occurs in a pressure reducing valve of the brake system when the circuit pressure change amount does not correspond to a predetermined range.