Sorption Filter Regeneration Pump for Tank Ventilation
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Solution Overview
Problem
Conventional tank ventilation systems in motor vehicles, especially in turbocharged and dethrottled engines, fail to adequately regenerate activated charcoal filters due to insufficient vacuum in the intake pipe, and there is a need for a cost-effective solution to perform on-board tank leakage diagnosis.
Innovation Solution
A device with a pump arranged on the fresh-air side of the sorption filter, which generates a fluid flow for regeneration and includes a timed tank ventilation valve and switching valves to manage fluid flow and pressure, allowing for demand-oriented regeneration and selective leakage diagnosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional tank ventilation system uses vacuum from the intake pipe for regeneration, then the system structure is simple, but the regeneration is inadequate in turbocharged and dethrottled engines due to insufficient vacuum
Solution Approach 1:
The pump is integrated into the tank ventilation system to serve multiple functions: it can generate vacuum for regeneration, perform leakage diagnosis, and control fluid flow through integrated switching valves. This multi-functionality resolves the contradiction by ensuring reliable regeneration without proportionally increasing system complexity.
Solution Approach 2:
The pump acts as an intermediary device that supplements or replaces the insufficient vacuum from the intake pipe. By introducing this intermediate vacuum source, the system achieves adequate regeneration pressure while maintaining a relatively simple overall structure through shared components like the switching valves.
2Productivity
If a pump is added to generate fluid flow for regeneration, then regeneration efficiency improves, but device complexity and cost increase
Solution Approach 1:
The pump and switching valves are designed to perform multiple functions including regeneration, leakage diagnosis, and fluid flow control. This multi-functionality increases productivity without proportionally increasing device complexity, as the same components serve multiple purposes throughout the system operation cycle.
Solution Approach 2:
The patent combines the regeneration function and leakage diagnosis function into a single integrated system using the same pump and switching valves. This merging of functions increases regeneration productivity while avoiding the need for separate dedicated components for each function, thereby limiting the increase in device complexity.
3Adaptability or versatility
If switching valves are used to manage fluid flow for both regeneration and diagnosis, then functional versatility improves, but device complexity increases
Solution Approach 1:
The switching valves are designed to control fluid flow for multiple functions including regeneration and leakage diagnosis. This multi-functionality provides diagnostic versatility without requiring separate dedicated valve systems for each function, thereby limiting the increase in device complexity while maximizing adaptability.
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 solution ensures complete desorption of the sorption filter, reduces fuel evaporation, and enables precise leakage detection with reduced power consumption and diagnostic time, even in conditions with insufficient vacuum, thus improving regeneration efficiency and diagnostic accuracy.
Implementation Method 1
the pump is configured to generate a fluid flow for regenerating the sorption filter
Implementation Method 2
the volatile substances are usually adsorbed by means of an activated charcoal filter and temporarily stored
Implementation Method 3
For regeneration or desorption of the activated charcoal filter, the substances are extracted by means of a fluid flow
Implementation Method 4
the extraction is achieved by means of a vacuum, which occurs in the intake pipe due to throttling of the engine
Implementation Method 5
atmospheric air is drawn through the adsorption filter due to a vacuum prevailing in an intake pipe
Data Source
AI summary
A device for selectively regenerating and performing tank leakage diagnosis of a tank ventilation system has a sorption filter and a pump. The sorption filter is configured to temporarily store fuel evaporating from a fuel tank. The pump is arranged at a fresh-air side of the sorption filter and is connected in fluid-conducting fashion to the sorption filter. The pump is configured to generate a fluid flow to regenerate the sorption filter.