Internal Combustion Engine Fuel Injection Segmentation
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Solution Overview
Problem
Internal combustion engines face challenges in extending the operating range of 'half-engine operation' with low emissions, as existing methods struggle to maintain stability and reduce fuel mass on combustion chamber walls during ignition angle retardation.
Innovation Solution
Implementing multiple fuel injections during switchover phases for interrupting and resuming fuel injection in combustion chambers, with at least one injection during an intake stroke and another during a compression stroke, while adjusting air charge and ignition angle to stabilize combustion and reduce wall film fuel mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the ignition angle is retarded to extend the operating range of fuel supply interruption, then the operating range is extended, but combustion stability deteriorates
Solution Approach 1:
The single fuel injection is divided into multiple individual injections per combustion cycle. This segmentation allows fuel to be introduced at different stages (intake stroke and compression stroke), ensuring stable combustion even when the ignition angle is retarded, thereby extending the operating range where fuel supply interruption can be applied.
Solution Approach 2:
Fuel is injected during the intake stroke before the compression stroke begins. This preliminary action ensures that fuel is already present in the combustion chamber before compression and ignition, maintaining combustion stability even with retarded ignition angles and enabling extended operating ranges for fuel supply interruption.
2Reliability
If single injection is used during switchover phase, then the injector and output stage are protected from overload, but combustion stability deteriorates when ignition angle is retarded
Solution Approach 1:
The fuel injection process is segmented into multiple smaller injections rather than one large injection. This segmentation stabilizes combustion with retarded ignition angles while distributing the injector load over time, preventing overload and maintaining both combustion stability and injector reliability during switchover phases.
3Stability of the object's composition
If fuel mass introduced into combustion chamber is increased, then combustion stability improves, but emissions increase due to wall film formation
Solution Approach 1:
Fuel injection is divided into multiple smaller quantities introduced at different stages of the combustion cycle. This segmentation reduces the total fuel mass that forms wall films on cold combustion chamber walls, thereby reducing harmful emissions while still maintaining combustion stability through distributed fuel introduction.
Solution Approach 2:
Fuel is introduced during the intake stroke before the combustion chamber walls are at their coldest. This timing reduces fuel-wall interaction and minimizes wall film formation, decreasing emissions while maintaining sufficient fuel availability for stable combustion even with retarded ignition angles.
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 approach significantly extends the operating range of fuel supply interruption, reduces emissions, and improves switchover processes by maintaining combustion stability and minimizing injector and output stage overload.
Implementation Method 1
the stability of combustion is ensured even if the ignition angle is retarded to a high degree
Implementation Method 2
The fuel mass introduced into the combustion chambers, i.e., a wall film on a cold combustion chamber wall, is reduced by such multiple injections
Data Source
AI summary
An internal combustion engine includes multiple combustion chambers. The supply of fuel into at least one subset of the combustion chambers can temporarily be interrupted. It is provided that the fuel be injected into the combustion chambers directly and during a switchover phase for interrupting or resuming fuel injection into the subset of combustion chambers, at least temporarily via multiple injections.