eCBV Module Integrating Venturi for Turbo Purge
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Solution Overview
Problem
Current turbo purge systems are complex and prone to hose-off conditions, leading to the unintended release of purge vapor into the atmosphere due to the need for multiple components and separate venturi hose-off detection systems.
Innovation Solution
An electronic compressor bypass valve (eCBV) module integrates a venturi module and eliminates the need for venturi inlet and outlet hoses, incorporating flow paths within the module and eliminating the requirement for a separate venturi hose-off detection system, thereby simplifying the design and preventing purge vapor release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a venturi vacuum generator is used to allow purge of the evaporative system while the turbocharger is activated, then purge vapor can be directed through various conduits to the intake manifold, but the system requires multiple components including venturi inlet and outlet hoses and a separate hose-off detection system
Solution Approach 1:
The patent combines the venturi vacuum generator, compressor bypass valve, and flow paths into a single integrated eCBV module. The venturi device is disposed within the outlet port of the module, eliminating the need for separate venturi inlet and outlet hoses. This integration reduces the number of components while maintaining the ability to generate vacuum and direct purge vapor flow.
Solution Approach 2:
The eCBV module performs multiple functions: it acts as a compressor bypass valve to control pressurized air flow, generates vacuum through the venturi device for purge vapor flow, and integrates the flow paths that would otherwise require separate hoses. The module serves both as a flow control device and a vacuum generation device, eliminating the need for separate hose-off detection systems.
2Reliability
If separate venturi inlet and outlet hoses are used, then flow control is achieved, but hose-disconnect conditions can occur leading to environmental release of purge vapor
Solution Approach 1:
The patent eliminates separate venturi inlet and outlet hoses by integrating the flow paths within the eCBV module housing. The venturi device is disposed within the outlet port, and the inlet port is in fluid communication with the venturi device through the housing structure, removing the vulnerability of external hose connections.
Solution Approach 2:
The eCBV module housing serves as an intermediary structure that replaces the function of separate hoses. The inlet port and outlet port are integrated into the housing, creating a fixed, reliable flow path that eliminates the possibility of disconnection while maintaining proper fluid communication between components.
3Reliability
If a hose-off detection system is added to monitor venturi hose connections, then purge vapor release can be detected, but the system complexity and cost increase
Solution Approach 1:
The patent removes the need for hose-off detection systems by eliminating the external hoses that could disconnect. By integrating the flow paths within the eCBV module housing, the potential failure mode of hose disconnection is removed entirely, making detection systems unnecessary.
Solution Approach 2:
The patent converts the potential harm of hose disconnection into a benefit by designing an integrated system where the housing itself provides the flow paths. This design choice eliminates the harmful possibility of hose-off conditions rather than attempting to detect and respond to them, simplifying the overall system.
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 eCBV module reduces the number of components, eliminates hose-off conditions, and ensures that purge vapor is not released into the atmosphere, enhancing the efficiency and reliability of the turbo purge system by integrating the flow paths and eliminating the need for a separate detection system.
Implementation Method 1
pressurized air passing through the venturi device creates vacuum pressure in the conduit, drawing purge vapor from the conduit into the second outlet port
Data Source
AI summary
An electronic compressor bypass valve (eCBV) module includes a pedestal housing, and a compressor bypass valve mounted to the pedestal housing. An inlet port, a first outlet port, and a second outlet port are integrally formed as part of the pedestal housing, where pressurized air flows into the inlet port. The eCBV module also includes a venturi device at least partially disposed in the second outlet port. When the compressor bypass valve is in an open position, a portion of the pressurized air flows through the first outlet port, and a portion of the pressurized air flows from the inlet port through the venturi device and through the second outlet port. When the compressor bypass valve is in the closed position the pressurized air is prevented from flowing into the first outlet port, and all of the pressurized air flows through the venturi device and through the second outlet port.