Fuel Tank Venting System with Position Sensor for Leak Detection
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Solution Overview
Problem
Conventional fuel tank venting systems for motor vehicles face challenges in detecting leaks between the first check valve and the intake manifold, which complicates repair and diagnosis, and do not meet regulatory requirements for detectability unless components are connected via nondetachable connections, making removal or replacement of the intake manifold cumbersome.
Innovation Solution
A fuel tank venting system with a position sensor connected to the first check valve, allowing for leak detection along the entire length of the first vent line up to the air filter, and utilizing a double check valve configuration to reduce costs and space, with a non-return flap mechanism for reliable closure and a Hall sensor for cost-effective and robust magnet element positioning, enabling independent installation and comprehensive diagnostic capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the first check valve is positioned very closely to the intake manifold at the end of the first vent line to enable leak detection, then leak detection capability is improved, but repair shop user-friendliness deteriorates since removal or replacement of the intake manifold can take place only together with the first check valve
Solution Approach 1:
The system divides the venting function into two separate check valves (first check valve in the first vent line, second check valve in the second vent line), allowing the first check valve to be positioned for optimal leak detection while the second check valve handles alternative venting. This segmentation enables the first check valve to be integrated with the intake manifold for comprehensive leak detection, while the system as a whole remains serviceable through the second vent line configuration.
2Measurement precision
If a position sensor is added to the first check valve to determine the position of the closing element, then comprehensive leak detection along the entire first vent line is enabled, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical leak detection mechanisms with a position sensor that uses a Hall effect sensor to detect the position of a magnet element on the closing element. This substitution enables comprehensive leak detection along the entire first vent line by monitoring the closing element position electrically, rather than requiring complex mechanical indicators or multiple sensors throughout the vent line.
3Ease of manufacture
If a double check valve configuration is used to reduce costs and space, then manufacturing cost and space requirements are reduced, but the complexity of ensuring both valves function correctly increases
Solution Approach 1:
The patent merges two check valve functions into a single integrated component where the first check valve and second check valve are positioned in close proximity and share common structural elements. This merging reduces manufacturing costs and space requirements compared to completely separate valve assemblies, while the shared structure simplifies the overall system complexity despite the dual valve function.
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
The system enhances repair shop user-friendliness and compliance with regulatory requirements by enabling comprehensive leak detection from the tank vent valve to the intake manifold, reducing costs and space requirements, and allowing for independent installation of the check valve, while ensuring reliable detection of leaks and obstructions in both vent lines.
Implementation Method 1
the position sensor includes a Hall sensor
Data Source
AI summary
A fuel tank venting system for a motor vehicle includes an outlet side of a tank venting valve connected to an inlet side of a first vent line and to an inlet side of a second vent line. An outlet side of the first vent line is connected to an intake manifold upstream from a throttle valve and downstream from an air filter, and an outlet side of the second vent line is connected to the intake manifold downstream from the throttle valve. A position sensor may be located at a first position and the first closing element has a detectable element. The position sensor is connected to an electronic control device to transmit signals. A position of the first closing element may be determined by means of the position sensor and the detectable element.