Variable Orifice Injection Channel for Exhaust Gas Distribution
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Solution Overview
Problem
Existing intake gas supply modules for vehicle engines experience inhomogeneous injection rates and temperatures of recirculated exhaust gases across cylinders due to varying static pressure, leading to potential orifice obstruction and inefficient gas distribution.
Innovation Solution
The injection channel and orifices are configured to maintain a substantially constant static pressure across all cylinders by varying the section and height of the orifices, ensuring equal flow rates and temperatures of recirculated exhaust gases, with a ratio of largest to smallest cross-sectional area between 1.4 and 2.25 and orifice diameters between 8 and 15 mm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the injection orifices have the same diameter and are arranged linearly along the injection channel, then the device structure is simple, but the static pressure and injection rate of recirculated exhaust gases decrease for each successive cylinder, causing inhomogeneous injection rates and temperatures
Solution Approach 1:
The patent applies local quality by varying the dimensions of injection orifices along the injection channel. Specifically, the diameter and/or length of each orifice is adjusted according to its position to compensate for the decreasing static pressure. This creates locally optimized injection characteristics that ensure uniform injection rates across all cylinders despite the pressure gradient along the channel.
Solution Approach 2:
The patent implements parameter changes by modifying the geometric parameters of the injection orifices (diameter, length, aspect ratio) along the injection channel. These parameter variations are designed to maintain constant injection rates by compensating for the pressure drop. The parameters are specifically tuned so that orifices experiencing lower pressure have larger effective flow areas.
2Ease of manufacture
If the injection orifices have the same diameter and are arranged linearly along the injection channel, then the manufacturing process is simplified, but particles in the recirculated exhaust gases can obstruct some of the injection orifices
Solution Approach 1:
The patent applies local quality by varying the dimensions of injection orifices along the injection channel. Specifically, the diameter and/or length of each orifice is adjusted according to its position to compensate for the decreasing static pressure. This creates locally optimized injection characteristics that ensure uniform injection rates despite the pressure gradient along the channel.
Solution Approach 2:
The patent implements parameter changes by modifying the geometric parameters of the injection orifices (diameter, length, aspect ratio) along the injection channel. These parameter variations are designed to maintain constant injection rates by compensating for the pressure drop. The parameters are specifically tuned so that orifices experiencing lower pressure have larger effective flow areas.
3Stress or pressure
If the section of orifices decreases from the inlet and/or the height of orifices increases from the inlet, then the static pressure is standardized across cylinders, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by varying the dimensions of injection orifices along the injection channel. Specifically, the diameter and/or length of each orifice is adjusted according to its position to compensate for the decreasing static pressure. This creates locally optimized injection characteristics that ensure uniform injection rates despite the pressure gradient along the channel.
Solution Approach 2:
The patent implements parameter changes by modifying the geometric parameters of the injection orifices (diameter, length, aspect ratio) along the injection channel. These parameter variations are designed to maintain constant injection rates by compensating for the pressure drop. The parameters are specifically tuned so that orifices experiencing lower pressure have larger effective flow areas.
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 standardizes recycling rates and temperatures between cylinders, preventing orifice obstruction and optimizing gas distribution, thereby enhancing engine efficiency and reducing the risk of heat exchanger failure.
Implementation Method 1
as the recirculated exhaust gases advance in the injection channel, the static pressure and therefore the injection rate of the recirculated exhaust gases decreases for each successive cylinder
Implementation Method 2
the injection orifices are configured, along the injection channel, so that their sections and/or the respective heights induce a flow of injection of the recirculated exhaust gases substantially equal for each injection port
Data Source
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AI summary
The invention relates to a device for the injection of recirculated exhaust gases from a vehicle engine, in particular a diesel engine, the injection device comprising a plurality of injection ports (26.1, 26.2, 26.3, 26.4), provided in a portion of the material of the injection device, each injection port (26.1, 26.2, 26.3, 26.4) having a cross section and a height extending through the thickness of the material. According to the invention, the cross sections and/or the heights of at least two of the injection ports (26.1, 26.2, 26.3, 26.4) are different.