Fluidic PCV Valve Assembly for Vortex-Based Reverse Flow Control
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Solution Overview
Problem
Traditional PCV systems face issues with sticking and clogging due to moving parts, particularly in turbocharged engines, leading to potential engine damage and reduced performance.
Innovation Solution
A bi-directional PCV valve assembly with fluidic geometry that operates without moving parts, featuring a vortex chamber and power nozzles to automatically switch between high and low flow modes based on pressure, ensuring reliable and efficient gas flow control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional PCV systems use moving parts like flapper valves to control gas flow, then flow rate adjustment is achieved, but sticking and clogging occur leading to reduced reliability
Solution Approach 1:
The patent replaces the mechanical flapper valve system with a fluidic PCV valve assembly that uses fluid dynamics principles. The fluidic geometry creates different flow paths and resistance characteristics without any moving parts, eliminating sticking and clogging issues while maintaining flow control capability through pressure-driven operation.
Solution Approach 2:
The invention employs pneumatic principles by using gas pressure differentials to control flow through the fluidic geometry. The PCV valve assembly utilizes the pressure differential between the crankcase and intake manifold to automatically regulate crankcase ventilation flow rates without mechanical actuators, relying entirely on fluid pressure control.
2Ease of manufacture
If PCV systems use simple vent tubes to allow gases to escape, then the system is simple, but oil and gases are vented to the atmosphere causing environmental pollution
Solution Approach 1:
The patent replaces the simple mechanical vent tube system with a fluidic control system that redirects crankcase gases through controlled flow paths back into the intake manifold. This substitution maintains manufacturing simplicity while eliminating direct atmospheric discharge of hydrocarbons and oil vapors, addressing environmental concerns.
3Productivity
If PCV valves use variable restriction mechanisms to control flow rates, then flow control is achieved, but the valves are prone to clogging and sticking
Solution Approach 1:
The patent substitutes mechanical variable restriction mechanisms with a fluidic geometry-based flow control system. The fluidic PCV valve assembly uses fixed geometric features that create pressure-dependent flow characteristics, eliminating moving parts that could stick or clog while maintaining effective flow rate control through fluid dynamic principles.
Solution Approach 2:
The fluidic PCV valve assembly is self-regulating, using the incoming gas flow itself to control the flow rates through its geometric features. The system automatically adjusts flow based on pressure differentials without requiring external control mechanisms, maintaining reliability while achieving productivity goals.
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 provides a durable and trouble-free PCV system with improved flow control, reducing the risk of clogging and sticking, enhancing long-term engine performance and minimizing maintenance costs by eliminating the need for flapper valves and moving parts.
Implementation Method 1
The PCV valve assembly is configured to automatically switch between a low flow mode and a high flow mode based on pressure differential
Implementation Method 2
a vortex chamber having a perimeter wherein the first and second power nozzles intersect along the perimeter of the vortex chamber
Data Source
Figure 1A
Figure 1B~1D
Figure 2
AI summary
Provided is a bi-directional PCV valve assembly, system and method. The bi-directional PCV valve may include a fluidic geometry that allows for a flow of fluid a high flow rate in one direction, forward flow, and a low flow rate in the opposite direction, reverse flow. The reverse flow includes a swirling flow that increases the pressure drop and reduces the flow rate to a third of the flow rate of the forward flow. The disclosed assembly produces a strong swirling flow (vortex) in the reverse direction and an efficient (low pressure drop) flow in the forward direction.