Exhaust Manifold Flap for Turbocharger and Recirculation Control
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Solution Overview
Problem
Existing exhaust manifolds for internal combustion engines with exhaust gas turbocharging and recirculation struggle to effectively control flow conditions for improved turbine loading and targeted exhaust gas recirculation, especially during transient operation.
Innovation Solution
An exhaust manifold design featuring a pivotable exhaust gas flap in the collector pipe, which controls the exhaust gas flow to both the turbocharger and recirculation outlets, allowing for variable operation and eliminating the need for reed valves, enabling efficient loading of the turbocharger and high recirculation rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If outlet openings for exhaust gas recirculation and exhaust gas turbocharger are spatially far apart on a collecting pipe, then both flows can be controlled, but the device complexity increases and space is consumed
Solution Approach 1:
The patent combines the control of both outlet openings (for exhaust gas recirculation and exhaust gas turbocharger) into a single spatial location on the collecting pipe. This is achieved by positioning both outlet openings adjacent to each other and controlling them with a single exhaust gas flap, thereby merging the spatial separation into a compact integrated structure that reduces device complexity while maintaining full control capability
Solution Approach 2:
The single exhaust gas flap serves multiple functions by simultaneously controlling flow to both the exhaust gas recirculation outlet and the exhaust gas turbocharger outlet. This multi-functional element replaces what would traditionally require separate control mechanisms for each outlet, reducing overall device complexity while preserving adaptability
2Device complexity
If a single exhaust gas flap controls both outlet openings, then component complexity is reduced and space is saved, but control precision for each flow may be compromised
Solution Approach 1:
The exhaust gas flap is designed as a dynamic, pivotably mounted component that can assume multiple angular positions. This dynamic capability allows the single flap to precisely regulate flow distribution between the two outlets by adjusting its angle, with the pivot axis positioned to enable independent control of each outlet's flow rate through continuous angular adjustment
Solution Approach 2:
The control precision is achieved by varying the angular parameter of the exhaust gas flap. By changing the flap's rotation angle around its pivot axis, the system continuously adjusts the flow distribution between the two outlets, enabling precise control of each flow path despite using a single control element
3Volume of moving object
If outlet openings are arranged adjacent to each other, then space is saved and structure is simplified, but flow interference between the two flows may occur
Solution Approach 1:
The exhaust gas flap is segmented into functional zones with its pivot axis strategically positioned to create distinct flow control regions. The flap's geometry and pivot location divide the combined outlet area into separate control zones, allowing each outlet to receive dedicated flow control without interference from the other, even though the outlets are spatially adjacent
Solution Approach 2:
The exhaust gas flap acts as an intermediary element between the collecting pipe and the two outlet openings. By positioning the flap at a specific location and angle, it mediates the flow distribution, directing exhaust gas to the appropriate outlet while preventing cross-interference between the two flow paths through its geometric configuration
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 design enhances the loading of the exhaust gas turbocharger, allows for efficient recirculation, and reduces component complexity, enabling space-saving and flexible engine operation with improved engine braking power regulation.
Implementation Method 1
the exhaust gas flow from the combustion chambers into separate flows to the turbocharger and recirculation outlets
Data Source
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AI summary
The invention relates to an exhaust manifold (1) for an internal combustion engine, in particular in motor vehicles, with exhaust gas turbocharging and exhaust gas recirculation for returning exhaust gas from the exhaust manifold (1) to the engine inlet, wherein the exhaust manifold (1) has a collector pipe (4) with several inlet openings (6) connected to the combustion chambers of the internal combustion engine, preferably via connecting nozzles, and outlet openings (7, 8) leading from the collector pipe (4) via connecting connections for exhaust gas recirculation and to the exhaust gas turbocharger, wherein the outlet openings (7, 8) are assigned a controlled, displaceable flow guide element which selectively divides the exhaust gas flow onto the outlet openings (7, 8) depending on predefinable operating parameters.According to the invention, the flow guide element is formed by an exhaust gas flap (10) pivotably mounted in the collector pipe (4), by means of which the exhaust gas flow can be controlled both to the outlet opening (7) for exhaust gas recirculation and to the outlet opening (8) to the exhaust gas turbocharger.