Two-Stroke Engine Particulate Filter Regeneration
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Solution Overview
Problem
Existing methods for regenerating particulate filters in vehicle engines, such as using an additional fuel injector, are costly and require complex installation, whereas current methods do not efficiently utilize existing components in the gas circuit to increase filter temperature effectively.
Innovation Solution
The method involves injecting fuel during the scavenging step of a two-stroke engine cycle, utilizing the existing fuel injection device to burn particles and soot trapped in the filter, optimizing fuel distribution and injection timing to enhance temperature increase without affecting engine performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an additional fuel injector is used to increase exhaust temperature for filter regeneration, then the regeneration effectiveness is improved, but the device complexity and installation cost increase
Solution Approach 1:
The existing fuel injection device serves dual purposes: normal fuel injection during compression stroke and regeneration fuel injection during exhaust stroke. The system uses its own existing components to achieve regeneration without requiring external assistance or additional dedicated regeneration injectors.
Solution Approach 2:
The single fuel injection device performs multiple functions by switching between different injection modes: standard fuel injection during the compression stroke for engine operation, and regeneration fuel injection during the exhaust stroke for filter cleaning. This multi-functionality eliminates the need for separate regeneration injectors.
2Productivity
If fuel is injected during the scavenging step to regenerate the filter, then the regeneration efficiency is improved, but the fuel consumption increases
Solution Approach 1:
Fuel injection for regeneration occurs periodically during specific exhaust strokes rather than continuously. The control unit activates the injection device only when regeneration is needed and only during the exhaust stroke portion of the cycle, minimizing unnecessary fuel consumption while maintaining effective regeneration capability.
Solution Approach 2:
Only a portion of the fuel injected during scavenging step is needed for regeneration, with the remainder contributing to the next combustion cycle. This partial action approach ensures sufficient fuel for filter regeneration without excessive fuel consumption, optimizing the balance between regeneration efficiency and fuel economy.
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 efficiently regenerates particulate filters using existing components, reducing costs and complexity, while maintaining engine performance and offering modularity in programming injection phases for precise regeneration.
Implementation Method 1
so that at least part of this fuel is carried away by the exhaust gases, with the aim of burning in said combustion chambers
Data Source
Figure 1~2
AI summary
The invention relates to a method for regenerating a particle filter of a two-stroke engine for a vehicle, said engine including at least one combustion chamber (1) comprising at least one intake member (2) and at least one exhaust member (3), the operating cycle of the engine comprising a first fuel-injection stage (10) for ensuring the combustion phase in said chamber (1), followed by a scavenging stage during which each intake member (2) and each exhaust member (3) is in an open position. The main characteristic of the method of the invention is that it includes a fuel-injection stage (10) during the scavenging stage.