Intake Structure Idling Air Passageway Inversion
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Solution Overview
Problem
In internal combustion engine intake structures, existing designs face challenges in intensifying tumbling flows during idling modes while preventing fuel accumulation in idling air passageways, particularly when the idling air passageway is positioned below the intake passageway.
Innovation Solution
The intake structure repositions the idling air passageway above the intake channel, with the tumble valve plate guiding idling air from the idling air passageway into the lower auxiliary passageway as a tumbling flow channel, preventing fuel accumulation and enhancing tumbling flow intensity by configuring the downstream outlet of the idling air passageway parallel to the tumble valve plate and within a tapered inner surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the idling air passageway is disposed in the lower side of the auxiliary passageway, then the structure is simplified, but fuel accumulates as a gas in the idling air passageway due to its higher position
Solution Approach 1:
The patent inverts the conventional arrangement by positioning the idling air passageway above the auxiliary passageway instead of below it. This inversion prevents fuel accumulation because fuel, being denser than air, naturally settles downward and cannot accumulate in the elevated idling air passageway, thereby eliminating the harmful effect while maintaining structural simplicity
2Productivity
If the auxiliary passageway is defined in the lower side for producing tumbling flow, then tumbling flow is generated, but fuel accumulates in the idling air passageway when it is positioned below
Solution Approach 1:
The patent reverses the vertical arrangement by placing the idling air passageway above the auxiliary passageway. This allows the auxiliary passageway to remain in the lower position for effective tumbling flow generation while the inverted position of the idling air passageway prevents fuel accumulation, thus resolving the contradiction between tumbling flow production and fuel accumulation prevention
3Object-generated harmful factors
If the idling air passageway is repositioned above the intake channel, then fuel accumulation is prevented, but the configuration becomes more complex
Solution Approach 1:
The patent merges the idling air passageway with the auxiliary passageway by making them share a common wall structure. The partition wall that defines the auxiliary passageway also serves as a boundary for the idling air passageway, thereby preventing fuel accumulation in the elevated position while avoiding the need for additional separate structural elements, thus reducing overall configuration complexity
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 effectively produces and intensifies tumbling flows during idling modes, preventing fuel accumulation and ensuring uniform mixing of fuel and air in the combustion chamber.
Implementation Method 1
the tumble valve plate guiding idling air from the idling air passageway into the lower auxiliary passageway as a tumbling flow channel
Implementation Method 2
fuel whose specific gravity is larger than air tends to accumulate as a gas in the idling air passageway disposed in the lower side of the auxiliary passageway
Data Source
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AI summary
In an intake structure for an internal combustion engines in which an inlet pipe 6 is connected to an intake port 42, defining an intake passageway 80; a throttle body 7 having an intake channel 70, a throttle valve 71 and a tumble valve 72 therein are connected to an upstream side of the intake passageway 80, and the intake passageway 80 is divided by a partition plate 81 into an upper main passageway 80A and a lower auxiliary passageway 80B serving as a tumbling flow channel, wherein an idling air passageway 100 is defined in an upper side of the intake channel 70 to provide fluid communication between a region upstream of the throttle valve 71 and a region downstream of the throttle valve 71, the idling air passageway 100 has a downstream outlet 102 defined in an upper inner surface 70aa of the intake channel 70 between the throttle valve and the tumble valve, and when the throttle valve is fully closed, idling air flowing out of the idling air passageway 100 is restrained by a tumble valve plate 72b of the tumble valve from flowing into the upper main passageway and is guided from a recess 72c in the tumble valve plate to the lower auxiliary passageway 80B. It is thus easy to intensify a tumbling flow even when the internal combustion engine is operating in an idling mode, etc.