Three-Way EGR Valve Flap Layout for Precise Full-Load Flow Control
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Solution Overview
Problem
Existing three-way exhaust gas recirculation valve arrangements face challenges in fine-tuning exhaust gas recirculation, particularly under full load conditions, due to high pressure differences leading to large changes in exhaust gas amounts with small adjustments in opening angle.
Innovation Solution
A three-way valve arrangement featuring a register flap with a small-quantity flap and a large-quantity flap, where the small-quantity flap can close the small-quantity opening and the large-quantity flap can limit the maximum opening angle, allowing precise control of exhaust gas recirculation by limiting the degree of opening of the large-quantity flap relative to the small-quantity flap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single flap is used for exhaust gas recirculation control, then the valve arrangement is simple in structure, but fine adjustment of exhaust gas quantity is difficult under full load conditions
Solution Approach 1:
The single flap is divided into two separate flaps: a large-quantity flap for coarse adjustment and a small-quantity flap for fine adjustment. This segmentation allows each flap to operate in its optimal range, with the large-quantity flap handling major flow changes and the small-quantity flap providing precise control under full load conditions.
Solution Approach 2:
Different regions of the valve system are assigned different functions: the large-quantity flap controls the main flow path for bulk exhaust gas recirculation, while the small-quantity flap controls a separate small-quantity opening for precise dosage. This local differentiation of function enables both coarse and fine adjustment capabilities within the same valve arrangement.
2Quantity of substance
If the opening angle is increased to recirculate more exhaust gas, then the exhaust gas quantity increases, but the control precision decreases due to high pressure differences
Solution Approach 1:
The exhaust gas recirculation control is segmented into two independent control paths: one through the large-quantity flap for high flow rates, and another through the small-quantity flap for low flow rates. This allows the system to select the appropriate control path based on the required recirculation amount, maintaining precision across the entire operating range.
Solution Approach 2:
The small-quantity flap provides excessive control authority for small recirculation amounts by dedicating a separate control path specifically for low-flow conditions. This partial action approach ensures that even small changes in opening angle produce only small changes in exhaust gas quantity, preventing overshoot and improving control precision.
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
Enables precise adjustment of exhaust gas recirculation, especially in full-load ranges, with smaller changes in opening angle resulting in smaller changes in exhaust gas quantity, enhancing the control over recirculated amounts and ensuring effective exhaust gas recirculation to the internal combustion engine.
Implementation Method 1
The small-quantity flap has a closing body with which a small-quantity opening provided in the large-quantity flap can be closed
Implementation Method 2
The driver is designed in such a way that the degree of opening of the large quantity flap is limited in relation to the small quantity flap
Implementation Method 3
The amount of exhaust gas that is returned to the internal combustion engine can be adjusted by adjusting the opening angle and depending on the prevailing pressure difference
Data Source
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AI summary
The invention relates to a three-way exhaust-gas recirculation valve assembly having three fluid openings (18, 32, 34) for exhaust-gas recirculation of an internal combustion engine, wherein the valve assembly comprises a valve housing, which forms the three fluid openings (18, 32, 34), a large-amount opening (18), which forms the first fluid opening (18), a register flap (1), and a flap shaft (16). The register flap (1) has a small-amount flap (4), which has a closing body (8), a large-amount flap (6) for closing the large-amount opening (18), wherein the large-amount flap (6) has a small-amount opening (12) that can be closed by means of the closing body (8) and wherein the small-amount flap (4) is movably connected to the large-amount flap by means of a connecting element, and a driver (22), which limits the degree of opening of the large-amount flap (6) in relation to the small-amount flap (4). The flap shaft (16), which bears the flaps (4, 6), is continuously adjustable between a closed position, in which the large-amount flap (6) closes the large-amount opening (18) and the closing body (8) closes the small-amount opening (12), a small-amount opening position, in which the closing body (8) is spaced apart from the small-amount opening (12) while the large-amount flap (6) lies against the large-amount opening (18), and a large-amount opening position, in which the large-amount flap (6) is lifted from the large-amount opening (18) by means of the driver (22).