Reed Valve Injector Layout for Cleaner Two-Stroke Engines
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Solution Overview
Problem
Current two-stroke internal combustion heat engines face challenges in reducing unburned hydrocarbon emissions due to overlap between intake and exhaust strokes, requiring complex and costly direct fuel injection systems, and lubricant distribution issues that lead to increased emissions and difficulty in cold starting.
Innovation Solution
A two-stroke internal combustion heat engine design featuring a reed valve with an integrated injector that sprays fuel independently of air intake, and a lubricant feeding system with lubrication orifices that open only during engine operation, ensuring precise lubricant distribution and preventing lubricant accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If direct fuel injection is used to reduce unburned hydrocarbon emissions during intake-exhaust overlap, then emissions are reduced, but the injection system becomes complex and costly
Solution Approach 1:
The injector is integrated directly into the reed valve structure, combining two separate components (fuel injection system and intake valve) into one unified component. This eliminates the need for separate injection systems while enabling precise fuel delivery during the intake stroke, thereby reducing unburned hydrocarbon emissions without increasing overall system complexity
Solution Approach 2:
The reed valve with integrated injector serves dual functions: controlling intake flow and delivering fuel injection. The injector automatically injects fuel during the intake stroke when the reed valve is open, utilizing the existing intake mechanism to achieve fuel delivery without requiring additional complex control systems
2Reliability
If continuous lubricant flow is used to ensure adequate lubrication, then lubrication is sufficient, but lubricant accumulates in the crank chamber causing cold starting difficulties and increased emissions
Solution Approach 1:
The lubricant feeding system operates periodically rather than continuously, with lubricant delivered only during specific phases of the engine cycle when the reed valve is open. This periodic delivery ensures adequate lubrication during operation while preventing lubricant accumulation in the crank chamber that would cause cold starting difficulties and increased emissions
Solution Approach 2:
The lubricant is delivered to specific locations (intake duct and crank chamber area) only when needed during engine operation. The system provides localized lubrication precisely where and when required, rather than continuous widespread lubricant distribution, thereby avoiding accumulation and associated harmful effects
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 simplifies fuel injection control, enhances fuel-air mixing, reduces lubricant consumption by 50%, and minimizes pollutant emissions, meeting stringent emissions regulations while maintaining engine compactness and economic advantages.
Implementation Method 1
an injector (23), which is integrated into the reed valve (11) and is independent of the reed valve (11) from a mechanical point of view, so that a fuel jet (25), which is sprayed by the injector (23) during the intake stroke, is directed into the crank chamber (4) downstream of the reed valve (11) relative to the fresh air feeding direction along the intake duct (9)
Implementation Method 2
the intake duct (9) is provided with lubrication orifices (34), which are closed by reed petals (22) when the reed petals (22) rest against the inner wall (19), so that the lubricant is introduced into the air taken in only when the air actually is taken in
Data Source
Figure 1
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AI summary
A two-stroke internal combustion heat engine (1) with fuel injection; the heat engine (1) has: at least one cylinder (2), which has, on the inside, a combustion chamber (6); a piston (7), which is mounted inside the cylinder (2) so as to slide in a reciprocating manner; an intake duct (9), which feeds fresh air towards the combustion chamber (6); a reed valve (11), which is arranged inside the intake duct (9); and an injector (23), which is provided with an injection nozzle (24), through which fuel is injected towards the combustion chamber (6). The injector (23) is mounted through the reed valve (11), so that the injection nozzle (24) sprays fuel downstream of the reed valve (11) relative to the feeding direction of the fresh air along the intake duct (9).