Venturi Nozzle Tank Ventilation for Supercharged Engine Purging
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Solution Overview
Problem
Existing tank ventilation systems for motor vehicles struggle to effectively purge activated carbon filters in supercharged engine modes, where low negative pressure in the suction pipe limits the regeneration of these filters, leading to insufficient purging and potential loss of adsorption capability.
Innovation Solution
A tank ventilation system that includes a Venturi nozzle connected to an environment line between the air filter and compressor, utilizing the pressure differential to generate negative pressure for purging the vapor filter, even in supercharged modes, by removing a carrier flow upstream of the throttle valve, thereby ensuring continuous regeneration of the activated carbon filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tank ventilation system relies on negative pressure from the suction pipe to purge the activated carbon filter, then the filter can be regenerated passively during normal engine operation, but the purging becomes insufficient when the throttle valve is wide open or in supercharged mode where negative pressure is low
Solution Approach 1:
The system divides the single purging path into two separate lines: a first line connected to the suction pipe for normal operation purging, and a second line with a Venturi nozzle for supercharged mode purging. This segmentation allows each line to be optimized for specific operating conditions, ensuring reliable filter regeneration across all engine modes.
Solution Approach 2:
The system changes the operating parameters of the purging system by introducing a Venturi nozzle that generates negative pressure through carrier flow velocity increase. This allows the second line to provide sufficient purging air flow rate even when the suction pipe negative pressure is low, maintaining productivity across different engine operating conditions.
2Productivity
If a Venturi nozzle is added to the second line to generate negative pressure for purging in supercharged mode, then sufficient purging air flow can be achieved, but the device complexity increases
Solution Approach 1:
The second line with the Venturi nozzle is designed to serve multiple functions: it provides purging capability during supercharged mode when suction pipe negative pressure is insufficient, and can operate in conjunction with the first line during normal operation. This multi-functionality justifies the added complexity by enhancing system versatility and ensuring adequate purging under all operating conditions.
Solution Approach 2:
The system uses pneumatic principles through the Venturi nozzle to generate negative pressure by accelerating carrier flow. This pneumatic mechanism provides a simple yet effective way to increase purging air flow rate without requiring mechanical pumps or complex control systems, thereby limiting the increase in device complexity.
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 ensures effective regeneration of the activated carbon filter in both suction and supercharged engine modes, maintaining its adsorption capability and preventing hydrocarbon vapors from entering the environment, by leveraging the pressure differential across the Venturi nozzle to provide sufficient negative pressure for purging.
Implementation Method 1
The second line includes a Venturi nozzle configured to remove carrier flow from downstream of the compressor and upstream of a throttle valve
Data Source
AI summary
A tank ventilation system of a motor vehicle includes a vapor filter, a first line connecting the vapor filter at a corresponding first introduction point to a suction pipe, and a second line connecting the vapor filter at a corresponding second introduction point to an environment line. The second introduction point is arranged between an air filter and a compressor of the environment line. The second line includes a Venturi nozzle configured to remove carrier flow from downstream of the compressor and upstream of the throttle valve.