Venturi EGR System for High Load Pressure Differential
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Solution Overview
Problem
During high load operation of internal combustion engines with exhaust driven turbochargers or engine driven superchargers, the pressure differential between the exhaust gas recirculation (EGR) supply and the compressed intake charge can be negative, making it difficult to supply EGR to the intake system effectively.
Innovation Solution
A venturi assembly is integrated into the intake system, creating a low pressure zone and an annular exhaust gas recirculation conduit distribution passage that receives diverted exhaust gas from the exhaust system, allowing for even distribution of EGR into the intake charge through diffuser passages, thereby overcoming the pressure differential and ensuring EGR delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high pressure EGR is diverted from upstream of the turbocharger during high load operation, then EGR can be supplied to the intake system, but the pressure differential becomes negative making it difficult to supply EGR
Solution Approach 1:
A venturi assembly is introduced as an intermediary device between the EGR supply line and the intake system. The venturi creates a low pressure zone that acts as a mediator to facilitate EGR flow despite the negative pressure differential between EGR supply and compressed intake charge
Solution Approach 2:
The system changes the pressure parameter by creating a low pressure zone through the venturi effect. This parameter change allows EGR to be delivered to the intake system by establishing a favorable pressure gradient through the diffuser passages
2Productivity
If a venturi system is used to decrease intake pressure for EGR delivery, then EGR can be delivered during high load operation, but even delivery and distribution of EGR at other operating conditions becomes challenging
Solution Approach 1:
The EGR distribution system is segmented into multiple diffuser passages arranged circumferentially around the venturi. This segmentation allows EGR to be distributed through multiple separate flow paths, improving uniformity of EGR delivery to the intake charge across different operating conditions
Solution Approach 2:
The diffuser passages are positioned at circumferentially spaced locations to provide localized EGR injection points around the venturi. This local quality approach ensures even distribution of EGR into the intake charge by delivering it at multiple locations rather than a single point
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
This configuration ensures efficient and even delivery of EGR to the intake system during high load operations, improving fuel efficiency and reducing tailpipe emissions by maintaining a positive pressure differential and ensuring consistent EGR distribution.
Implementation Method 1
A venturi assembly is integrated into the intake system, creating a low pressure zone
Data Source
AI summary
An internal combustion engine comprises an intake system to deliver a compressed intake charge thereto. A venturi assembly is disposed in the intake system and defines a venturi defining a low pressure zone “Z” for the intake charge passing therethrough. An annular exhaust gas recirculation conduit distribution passage extends circumferentially about an inlet annulus of an intake manifold and receives diverted exhaust gas from an exhaust system for delivery to the intake charge through exhaust gas recirculation diffuser passages disposed at circumferentially spaced locations about the annular exhaust gas recirculation conduit distribution passage.