Engine Exhaust Pipe Layout for Turbocharger and ATD Thermal Expansion
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Solution Overview
Problem
Conventional engine configurations with exhaust gas purification devices above the engine body face issues with thermal expansion, leading to potential damage and challenges in maintaining compactness due to the need to absorb thermal expansion caused by high-temperature exhaust gases.
Innovation Solution
The engine configuration includes a connection pipe that connects the turbocharger and exhaust gas purification device, arranged such that it extends below the turbocharger and is parallel to the engine's longitudinal direction, allowing for a more compact layout and absorption of thermal expansion while avoiding protrusion from the turbocharger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If direct injection of fuel is used to improve combustion efficiency, then power output increases, but nitrogen oxide emissions increase
Solution Approach 1:
The fuel injection process is divided into multiple stages: a first fuel injection occurs during the compression stroke, followed by a second fuel injection during the power stroke. This segmentation allows the fuel to be introduced at different times and conditions, enabling complete combustion while controlling peak temperatures that lead to nitrogen oxide formation.
Solution Approach 2:
Fuel is injected during the compression stroke before the power stroke begins. This preliminary injection allows the fuel to mix with air and begin combustion preparation in advance, so that when the power stroke occurs, the combustion is already optimized and occurs more efficiently without requiring excessive peak temperatures.
2Ease of manufacture
If conventional fuel injection timing is used, then engine operation is simple, but combustion is incomplete and unburned hydrocarbons are emitted
Solution Approach 1:
The fuel injection is divided into two distinct phases: first injection during compression stroke to initiate combustion, and second injection during power stroke to complete combustion. This segmentation ensures complete burning of fuel while maintaining relatively simple engine operation without requiring complex multi-point injection systems.
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 enables a rational layout of the engine, maintaining compactness and preventing damage from thermal expansion, while allowing for efficient exhaust gas purification and improved space utilization for other devices.
Implementation Method 1
a piston moves between a top dead center and a bottom dead center to suck in, compress, ignite and exhaust a fuel charge
Implementation Method 2
a spark plug is provided in the combustion chamber for igniting the fuel charge
Data Source
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AI summary
An engine 100 is provided with an engine body 1, a crankshaft 10, a cooling fan 6, an exhaust manifold 42, a supercharger 24, an ATD 43 that purifies exhaust gas, and a second exhaust pipe 52. When the height direction of the engine 100 is defined as a first direction, the crankshaft 10 extends in a second direction vertical to the first direction. The cooling fan 6 is disposed on one side of the engine body 1 in the second direction. The supercharger 24 is driven by the exhaust gas from the exhaust manifold 42. The second exhaust pipe 52 connects the supercharger 24 and the ATD 43. The ATD 43 is disposed in an attitude in which the longitudinal direction thereof is parallel to the second direction. The second exhaust pipe 52 is connected to the cooling fan 6 side of the ATD 43 in the second direction. The second exhaust pipe 52 is disposed so as to pass laterally with respect to the exhaust manifold 42 and below the supercharger 24.