Pre-combustion Chamber Flow Agitator for Lean Mixture Ignition
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Solution Overview
Problem
Internal combustion engines using lean air-fuel mixtures often experience misfires and incomplete combustion due to the lack of a reliable and efficient ignition source, necessitating a more effective pre-combustion chamber system.
Innovation Solution
A pre-combustion chamber system with a flow agitator and cooling chamber design that enhances mixing by creating agitated flow and increased heat exchange, reducing fuel requirements and emissions while improving engine stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a lean air-fuel mixture is used to reduce emission and increase fuel efficiency, then fuel efficiency improves, but combustion reliability deteriorates due to misfires and incomplete combustion
Solution Approach 1:
The combustion chamber is divided into two separate chambers: a pre-combustion chamber for reliable ignition and a main combustion chamber for lean combustion. This segmentation allows each chamber to be optimized for its specific function, resolving the contradiction between lean mixture efficiency and combustion reliability
Solution Approach 2:
The pre-combustion chamber acts as an intermediary that generates a high-temperature ignition source which then ignites the lean air-fuel mixture in the main combustion chamber. This mediator enables reliable ignition of lean mixtures that would otherwise be difficult to ignite
2Reliability
If a pre-combustion chamber system is used to provide higher energy ignition source, then combustion reliability improves, but device complexity increases
Solution Approach 1:
The pre-combustion chamber and main combustion chamber are merged into a single integrated component with a shared housing structure. This merging reduces the number of separate parts and simplifies manufacturing while maintaining the functional benefits of the two-chamber design
Solution Approach 2:
The pre-combustion chamber housing serves multiple functions: it contains the pre-combustion chamber, provides structural support, and integrates with the main combustion chamber housing. This multi-functionality reduces the need for additional components, simplifying the overall system
3Power
If fuel is injected into the pre-combustion chamber and ignited, then ignition energy increases, but fuel consumption increases
Solution Approach 1:
A small amount of fuel is injected into the pre-combustion chamber to create a high-temperature ignition source, which then ignites the much larger quantity of lean air-fuel mixture in the main combustion chamber. This partial action approach uses minimal fuel to achieve the ignition function while maintaining overall fuel efficiency
Solution Approach 2:
The system changes the fuel injection parameters by injecting a controlled, reduced quantity of fuel into the pre-combustion chamber compared to direct injection into the main chamber. This parameter change optimizes the balance between ignition energy and fuel consumption
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
The enhanced mixing and cooling design improve combustion efficiency, reduce emissions, and increase engine stability by providing a stronger ignition source for lean fuel mixtures, leading to more reliable engine operation.
Implementation Method 1
The flow agitator is configured to increase flow disturbance in the pre-combustion chamber
Implementation Method 2
a cooling chamber defined between the pre-combustion chamber housing and the cooling chamber housing
Data Source
AI summary
A pre-combustion chamber system is presented. The pre-combustion chamber system includes a pre-combustion chamber housing defining a pre-combustion chamber, a cooling chamber housing surrounding the pre-combustion chamber housing, a cooling chamber defined between the pre-combustion chamber housing and the cooling chamber housing. The pre-combustion chamber system includes a flow agitator arranged in the pre-combustion chamber housing protruding into the pre-combustion chamber. The flow agitator increases flow disturbance in the pre-combustion chamber for improving mixture of fuel and air. Cooling of the pre-combustion chamber system is improved by dividing the cooling chamber into a cooling inner chamber and a cooling outlet chamber or by arranging cooling fins in the pre-combustion chamber housing extending into the cooling chamber.