Gaseous Fuel Injection Assembly for Two-Stroke Engines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing direct injection gaseous fuel systems for two-stroke internal combustion engines face complexity in structure and controllability of liquefied gas pumps, particularly in delivering high-pressure gas efficiently and safely.
Innovation Solution
A modular assembly that pumps liquefied gas in a liquid phase, evaporates it into a gaseous form, and injects it into the engine cylinder, featuring a single-wall enclosure for safety, a double-wall fuel feed line for leak containment, and a blower for safe fuel removal, with a heat exchanger unit and gaseous gas accumulator for efficient fuel delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a high-pressure pump system with multiple pump units and control fluid systems is used to deliver gaseous fuel, then the fuel delivery pressure and capability are improved, but the structural complexity and controllability deteriorate
Solution Approach 1:
The system is divided into separate functional modules: a common enclosure housing multiple pump units, each with its own fuel feed line and control mechanism. This segmentation allows independent control of each pump while maintaining high pressure delivery capability, reducing overall system complexity through modular design
Solution Approach 2:
The common enclosure serves multiple functions: it houses the pump units, provides structural support, and acts as a containment chamber. The pump units are designed with universal mounting and control interfaces, allowing them to perform the same fuel pressurization function while being easily replaceable or adjustable
2Ease of manufacture
If a single-wall enclosure is used for the pump system, then the structural simplicity and ease of manufacture are improved, but the safety and leak containment capability deteriorate
Solution Approach 1:
The fuel feed lines are nested within the common enclosure, with the lines running through sealed conduits or channels in the enclosure structure. This nested arrangement provides leak containment within the enclosed space while maintaining a relatively simple single-wall external structure that is easier to manufacture than multi-wall external enclosures
3Productivity
If high-pressure gaseous fuel is delivered to injectors for direct injection, then the combustion efficiency and power output are improved, but the safety risks and operational complexity deteriorate
Solution Approach 1:
The system converts the potential harm of high-pressure fuel leaks into a controlled scenario by designing the common enclosure as a containment chamber with intentional venting or recovery mechanisms. Any leaks are captured within the enclosed space and redirected to the recovery system rather than being released into the environment, turning a safety hazard into a recoverable situation
Solution Approach 2:
The common enclosure acts as an intermediary between the high-pressure fuel sources and the injection points, providing a controlled transition zone. The enclosure includes pressure regulation mechanisms and sealed connections that mediate the high-pressure fuel flow, reducing safety risks while maintaining combustion efficiency
4Ease of operation
If a modular assembly design is used for the fuel injection system, then the ease of installation and integration with existing engines are improved, but the manufacturing precision and assembly complexity deteriorate
Solution Approach 1:
The fuel injection system is segmented into a complete modular assembly containing all necessary components (pump units, fuel lines, injectors, enclosure) pre-assembled and pre-tested as a single unit. This segmentation allows the entire high-pressure fuel system to be installed as one module on existing engines, simplifying installation while maintaining precision through factory assembly quality control
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 solution enhances the efficiency and safety of gaseous fuel injection by maintaining high-pressure fuel delivery while minimizing structural complexity and ensuring safe operation, allowing for easy integration with existing engines.
Implementation Method 1
a heat exchanger unit configured to evaporate the pumped gas into gaseous form
Implementation Method 2
The assembly (50) comprises a liquefied gas high-pressure pump unit (160) configured to pump the liquefied gas to high-pressure
Data Source
Figure 1~2
Figure 3
AI summary
Invention relates to an assembly (50) for direct injection of gaseous fuel in a cylinder (100) of a two-stroke internal combustion piston engine (1), the assembly (50) comprising: an enclosure (102), enclosing - a liquefied gas supply manifold (120,120'), - a liquefied gas return manifold (140,140'), - a liquefied gas high-pressure pump unit (160) connected to the liquefied gas supply manifold (120, 120') and to the liquefied gas return manifold (140, 140'), and the assembly further comprising: - a high-pressure liquefied gas outlet (180) in the liquefied gas high-pressure pump unit (160), and - a heat exchanger unit (200) configured to evaporate the liquefied gas and heating the gaseous gas and provided with a liquefied gas inlet (201) and a gaseous gas outlet (202), the liquefied gas inlet (201) being connected to the high-pressure outlet (180) the liquefied gas high-pressure pump unit (160) by means of a fuel feed line (320), and - at least one gaseous gas fuel injector (220) connected to the heat exchanger unit.