Double-Walled Fuel Pipe for Internal Combustion Engine
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Solution Overview
Problem
The precision of fuel injection in internal combustion engines using gaseous fuel is compromised due to significant variations in fuel density and pressure caused by temperature changes, leading to inconsistent fuel injection amounts.
Innovation Solution
A fuel supplying device with a double-walled pipe structure in the fuel passage, where the gaseous fuel flows through an inner pipe and coolant circulates between the inner and outer pipes, facilitating heat exchange to stabilize the fuel temperature and maintain precise fuel injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gaseous fuel is used in the fuel passage, then the fuel supply system can operate, but the temperature of the fuel varies due to various factors causing deterioration in precision of fuel injection amount
Solution Approach 1:
The fuel passage employs a double-walled pipe structure where the inner pipe carries gaseous fuel and the outer pipe contains coolant. This nested configuration allows the coolant to circulate between the walls of the inner and outer pipes, creating a heat exchange chamber that stabilizes fuel temperature without interfering with fuel flow.
Solution Approach 2:
Coolant acts as an intermediary substance that transfers heat between the gaseous fuel and the surrounding environment. By circulating coolant through the space between the inner and outer pipes, the system mediates temperature stabilization of the fuel, preventing direct thermal contact while achieving temperature control.
2Adaptability or versatility
If temperature of gaseous fuel varies, then the fuel supply system can adapt to different conditions, but the density and pressure loss in the flow passage change significantly
Solution Approach 1:
The nested double-walled pipe structure creates a dedicated coolant circulation path between the inner fuel pipe and outer pipe wall. This configuration allows independent control of coolant flow to stabilize fuel temperature while maintaining fuel flow adaptability to different operating conditions.
Solution Approach 2:
The system actively changes the temperature parameter of the gaseous fuel by circulating coolant through the annular space between the inner and outer pipes. This parameter control stabilizes fuel density and pressure loss characteristics, ensuring consistent fuel injection performance across varying operating conditions.
3Device complexity
If a single-walled pipe structure is used in the fuel passage, then the device complexity is low, but the temperature of gaseous fuel cannot be stabilized
Solution Approach 1:
The double-walled pipe structure nests the inner fuel-carrying pipe within the outer coolant-containing pipe, creating an annular space for coolant circulation. This nested design adds temperature stabilization capability while maintaining relatively simple construction compared to more complex heat exchange systems.
Solution Approach 2:
Coolant serves as an intermediary heat transfer medium circulating through the space between the inner and outer pipes. This intermediary approach enables effective temperature stabilization of the fuel without requiring direct contact between fuel and cooling elements, maintaining system simplicity.
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 double-walled pipe structure effectively stabilizes the temperature of gaseous fuel, preventing precision deterioration of fuel injection amounts by mitigating temperature variations, thereby ensuring consistent fuel delivery to the engine cylinders.
Implementation Method 1
Heat is exchanged between the coolant and the pressure reduction valve. The fuel passage is configured such that a coolant is supplied to a space between the outer pipe and the inner pipe.
Implementation Method 2
The double-walled pipe structure includes an inner pipe through which the gaseous fuel flows and an outer pipe that covers the inner pipe, facilitating heat exchange to stabilize the fuel temperature
Data Source
AI summary
A fuel supplying device for an internal combustion engine includes a tank configured to store a gaseous fuel, a fuel injection valve configured to supply the gaseous fuel to a cylinder of the internal combustion engine, a fuel passage configured to supply the gaseous fuel in the tank to the fuel injection valve, and a pressure reduction valve provided in the fuel passage. The fuel passage has a double-walled pipe structure including an inner pipe through which the gaseous fuel flows and an outer pipe that has an inner diameter larger than the inner pipe and covers the inner pipe. The fuel passage is configured such that a coolant is supplied to a space between the outer pipe and the inner pipe.