Vacuum Leak Detection for Fast Enclosure Seal Testing

Solution Overview

Problem

Conventional leak detection methods for automobile enclosures are complicated and time-consuming, necessitating a more efficient and streamlined approach to ensure the integrity of seals after service operations.

Innovation Solution

A vacuum-based leak detection system utilizing a vacuum pump, mass airflow sensor, and controller to generate data on mass exchange rates, valve displacement, and pressure conditions, comparing these against predetermined thresholds to quickly identify leaks in enclosures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional leak detection methods are used, then seal integrity can be tested, but the testing procedure becomes complicated and time-consuming

Engineering Contradiction:

Improveseal integrity testingVSAvoidtesting procedure time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent replaces complex mechanical leak detection systems with a vacuum-based detection method. A vacuum pump creates negative pressure in the enclosure, and a flow sensor detects mass flow rates to identify leaks. This substitution of the detection mechanism simplifies the overall testing procedure while maintaining reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the physical parameter being measured from complex mechanical indicators to simple mass flow rate under vacuum conditions. By maintaining a predetermined vacuum pressure and measuring the corresponding mass flow rate, the system transforms a complex leak detection problem into a straightforward parameter comparison that can be quickly evaluated against threshold values.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If conventional leak detection methods are used, then seal integrity can be tested, but the procedure complexity increases

Engineering Contradiction:

Improveseal integrity testingVSAvoidtesting procedure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces complex mechanical leak detection systems with a vacuum-based detection method. A vacuum pump creates negative pressure in the enclosure, and a flow sensor detects mass flow rates to identify leaks. This substitution of the detection mechanism simplifies the overall testing procedure while maintaining reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system automatically compares the measured mass flow rate against predetermined threshold values and generates appropriate indication signals without requiring complex manual analysis. The vacuum pump automatically maintains predetermined pressure, and the controller automatically evaluates results, reducing procedural complexity.

Inventive Principle:

Principle #25Self-service

3Measurement precision

If vacuum pressure is increased to improve leak detection sensitivity, then detection accuracy improves, but the time to achieve target pressure increases

Engineering Contradiction:

Improveleak detection sensitivityVSAvoidpressure achievement time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent changes the physical parameter being measured from complex mechanical indicators to simple mass flow rate under vacuum conditions. By maintaining a predetermined vacuum pressure and measuring the corresponding mass flow rate, the system transforms a complex leak detection problem into a straightforward parameter comparison that can be quickly evaluated against threshold values.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system uses a mass flow sensor to indirectly detect leaks by measuring the copy effect of air flow into the vacuum chamber, rather than directly detecting the leak source. This indirect measurement approach allows for rapid detection without requiring extended pressure stabilization times.

Inventive Principle:

Principle #26Copying

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

Facilitates rapid and accurate leak detection by analyzing mass exchange rates, valve displacement, and pressure conditions, reducing the time and complexity of testing procedures.

Implementation Method 1

activating the vacuum pump to apply a predetermined fixed vacuum pressure to the internal chamber

Methodology Applied

Scientific EffectVacuum: Vacuum

Implementation Method 2

generating mass exchange rate data with a mass airflow sensor indicating a rate of mass exchange within the closure

Methodology Applied

Scientific EffectMass exchange rate measurement:

Data Source

PatentUS12480832B2Vacuum-based leak detection

Publication Date: 2025.11.25 BOSCH AUTOMOTIVE SERVICE SOLUTIONS INC

AI summary

A system and method for detecting leaks in an enclosure having a port and intended to prevent liquid material from exchanging into or out of the enclosure. A vacuum pump is coupled to the port and the enclosure is subjected to an applied vacuum pressure. Measurements of the mass and pressure within the enclosure while subject to the applied vacuum pressure are compared to expected values to detect a leak. In some embodiments, the physical arrangement of a valve of the enclosure is measured and compared to expected values to detect a leak.