Internal Combustion Engine Injector Flushing for Heat and Deposits
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Solution Overview
Problem
Existing internal combustion engines face challenges with direct fuel injectors experiencing thermal degradation and deposit formation due to high thermal loads, particularly when switching between external and internal mixture formation modes, leading to complexity and high manufacturing costs in existing cooling solutions.
Innovation Solution
An internal combustion engine design that includes a control unit to manage a gas mixing device and direct fuel injector, using a flushing gas to intermittently activate the direct fuel injector during a first operation mode, reducing thermal stress and deposit formation by injecting flushing gas into the main combustion chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If direct fuel injectors are used for internal mixture formation, then the engine can operate in second operation mode with second gaseous fuel, but the injectors experience high thermal loads leading to thermal degradation and deposit formation
Solution Approach 1:
The control unit activates the direct fuel injector intermittently during first operation mode to inject flushing gas, creating periodic cooling and cleaning actions that prevent thermal degradation and deposit formation while maintaining injector reliability for second operation mode
2Temperature
If passive cooling by injected fuel is used, then thermal load of fuel injectors is reduced, but the solution is insufficient for prolonged first operation mode operation
Solution Approach 1:
The system uses itself to cool and clean the injector by activating the injector to inject flushing gas during first operation mode, creating a self-service cooling mechanism that maintains injector temperature and functionality without external cooling systems
3Temperature
If active cooling systems are used to cool down portions of injectors, then thermal load is reduced, but the systems are very complicated and expensive to manufacture
Solution Approach 1:
The direct fuel injector serves its own cooling needs by injecting flushing gas during first operation mode, eliminating the need for complex external active cooling systems and reducing manufacturing costs while maintaining injector temperature control
Solution Approach 2:
The direct fuel injector performs multiple functions: fuel injection during second operation mode and self-cooling/cleaning during first operation mode, eliminating the need for separate cooling system components
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 effectively cools and cleans the direct fuel injector, maintaining its functionality and reducing deposits without the complexity and cost of traditional cooling systems, while allowing flexible operation with different fuels.
Implementation Method 1
the direct fuel injector can be cooled by the flushing gas to reduce the thermal load on the direct fuel injector
Implementation Method 2
deposits can be relieved in a timely manner by the flushing gas during operation according to the first operation mode
Data Source
AI summary
A controller configured to control a gas mixing device and/or a port injection valve and a direct fuel injector of an internal combustion engine in order to:in a first operation mode, supply a first gaseous fuel to at least one main combustion chamber of the internal combustion engine via at least one intake valve,in a second operation mode, supply a second gaseous fuel to the at least one main combustion chamber of the internal combustion engine by use of the direct fuel injector,wherein a supply system for providing flushing gas to the direct fuel injector is provided and the controller is configured to activate the direct fuel injector during operation according to the first operation mode, such that the flushing gas is injected into the at least one main combustion chamber.