Pressure Build-Up Valve Functional State Monitoring
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Solution Overview
Problem
Existing brake systems face challenges in accurately determining the functional state of pressure build-up valves, particularly in detecting gross leaks, which can lead to erroneous assessments and safety issues during brake activation.
Innovation Solution
A method and device for monitoring the functional state of pressure build-up valves in hydraulic brake boosters, utilizing sensors and evaluation devices to differentiate between normal and error states, including gross leaks, by analyzing pressure changes and current intensities, and adjusting operating modes to ensure safe and reliable brake system operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure build-up valve is monitored during brake activation, then the functional state can be determined, but erroneous error detection may occur due to normal pressure changes during activation
Solution Approach 1:
The system performs a preliminary check of the pressure build-up valve function before brake activation occurs. By monitoring pressure changes in the booster cylinder during a predefined time period after activation, the system can distinguish between normal pressure dynamics during braking and actual leakage errors, thereby avoiding false positives while maintaining detection accuracy
Solution Approach 2:
The monitoring device continuously receives feedback signals from pressure sensors in the booster cylinder and compares pressure changes against expected values during brake activation. This feedback mechanism allows the system to dynamically adjust its error detection threshold, recognizing normal pressure fluctuations during activation while still detecting abnormal leakage conditions
2Reliability
If the pressure build-up valve has a gross leak, then pressure cannot be maintained in the booster cylinder, but the brake system must remain operable for driver input
Solution Approach 1:
The system extracts and isolates the faulty pressure build-up valve from the overall brake system operation. When a gross leak is detected, the monitoring device separates the diagnostic function from the braking function, allowing the brake system to remain operable through alternative pathways while the defective valve is identified and flagged for replacement
Solution Approach 2:
The brake system incorporates self-diagnostic capabilities that automatically detect and report valve leakage conditions without external intervention. The monitoring device continuously assesses valve functionality and provides self-service error detection, enabling the system to maintain operational awareness and alert the driver to replace the defective valve while preserving braking capability
Data Source
AI summary
A method for determining a functional state of a pressure build-up valve of a hydraulic brake booster of a brake system, having the following steps: comparing an activation intensity of an activation of a brake activating element of the brake system to a predefined minimum activation intensity; if the brake activation intensity is less than or equal to the minimum activation intensity, determining the functional state, taking into account a pressure change over time in at least a partial volume of the hydraulic brake booster; if the brake activation intensity is greater than the minimum activation intensity, determining the functional state, taking into account an operating mode which is predefined for a pressure reduction valve of the hydraulic brake booster. A function monitoring device for a pressure build-up valve of a hydraulic brake booster of a brake system is also described.