Integral Purge Ejector Tee in Turbocompressor Housing
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Solution Overview
Problem
In forced induction applications, modern internal combustion engine evaporative fuel emissions systems face challenges in effectively performing fuel evaporative emissions purge and leak detection functions due to potential undetectable leak paths in the EVAP system.
Innovation Solution
An integral boost purge ejector tee arrangement is integrated into a turbocompressor, which includes passages and a nozzle to create a vacuum during boost operations, drawing purge vapor from a canister and improving leak detection by eliminating external fluid lines and connections, thereby reducing complexity and enhancing robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external fluid lines and connections are used in the EVAP system, then the system can perform purge and leak detection functions, but the system complexity increases and undetectable leak paths are created
Solution Approach 1:
The patent combines the EVAP system components directly with the turbocharger housing, merging the purge canister, flow passages, and nozzle into a single integrated structure. This eliminates external fluid lines and connections between components, reducing the number of potential leak paths while maintaining the system's purge and leak detection functions. The integrated design ensures that all fluid pathways are contained within the sealed turbocharger housing.
Solution Approach 2:
The turbocharger housing is designed to serve multiple functions: it houses the turbocharger mechanical components, contains the EVAP system flow passages, and provides the structural framework for the integrated purge canister. This multi-functionality reduces the overall system complexity by eliminating separate housings and mounting structures that would be required for standalone EVAP components.
2Reliability
If external fluid lines and connections are used in the EVAP system, then the system can perform purge and leak detection functions, but the robustness of the system decreases
Solution Approach 1:
The patent combines the EVAP system components directly with the turbocharger housing, merging the purge canister, flow passages, and nozzle into a single integrated structure. This eliminates external fluid lines and connections between components, reducing the number of potential leak paths while maintaining the system's purge and leak detection functions. The integrated design ensures that all fluid pathways are contained within the sealed turbocharger housing.
3Productivity
If multiple external connections are used in the EVAP system, then the purge function can be performed, but the number of potential undetectable leak paths increases
Solution Approach 1:
The patent combines the EVAP system components directly with the turbocharger housing, merging the purge canister, flow passages, and nozzle into a single integrated structure. This eliminates external fluid lines and connections between components, reducing the number of potential leak paths while maintaining the system's purge and leak detection functions. The integrated design ensures that all fluid pathways are contained within the sealed turbocharger housing.
Solution Approach 2:
The patent introduces a vacuum port as an intermediary connection point that allows the EVAP system to interface with the engine's vacuum system without requiring multiple external fluid lines. This single vacuum port serves as the primary interface for both purge vapor delivery and leak detection, reducing the number of connection points while maintaining system functionality.
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 enhances the EVAP system's ability to perform fuel evaporative emissions purge and leak detection functions while reducing undetectable leak paths, improving robustness and detection capabilities, and reducing system complexity and cost.
Implementation Method 1
the second passage is adapted to receive boost air flow, which flows through the nozzle and first passage thereby creating a vacuum and drawing purge through the inlet port
Data Source
AI summary
A boost purge ejector tee arrangement is integrated into a turbocompressor associated with an engine and includes first and second passages, an inlet port and a nozzle. The first passage is formed into a housing of the turbocompressor and includes an outlet in communication with a turbocompressor inlet. The second passage is formed into the housing and includes a boost air inlet in communication with an internal outlet area of the turbocompressor and intersecting the first passage. The inlet port is associated with the housing and intersects the first passage. The nozzle is positioned in the first passage such that an outlet of the nozzle is proximate the intersection of the inlet port and first passage. During a boost mode of operation, the second passage is adapted to receive boost air flow, which flows through the nozzle thereby creating a vacuum and drawing purge through the inlet port.