Engine Fuel Supply Device Stabilizing Gas-Liquid Mixture Ratio
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Solution Overview
Problem
The existing fuel supply devices for engines face instability in fuel pressure controllability due to fluctuations in the gas-liquid mixture ratio, primarily caused by variations in gas fuel generation and mixture ratios within the sub fuel tank, leading to inadequate fuel injection control and reduced engine performance.
Innovation Solution
The implementation of a fuel supply device with a primary pump, a secondary pump, and a circulation path that includes a preloading mechanism, such as a pressure adjustment valve, to stabilize the gas-liquid mixture ratio by returning gas-liquid mixed fuel to the primary pump, ensuring a consistent fuel supply to the secondary pump, thereby maintaining controlled discharge pressure and improving fuel injection precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fuel is stored in a sub fuel tank and vaporized to generate gas fuel, then fuel injection flexibility is improved, but gas-liquid mixture ratio fluctuation occurs causing fuel pressure controllability deterioration
Solution Approach 1:
The patent applies preliminary action by pre-chilling the fuel in the sub fuel tank before it reaches the secondary pump. The fuel is cooled to a temperature below its freezing point in advance, ensuring that even when gas fuel is generated through vaporization, the liquid fuel remains in a stable, chilled state that prevents excessive gas-liquid mixture ratio fluctuation and maintains fuel pressure controllability.
Solution Approach 2:
The patent changes the temperature parameter of the fuel by chilling it to below its freezing point before supply to the secondary pump. This parameter change stabilizes the fuel's physical state, reducing the impact of gas fuel generation on the gas-liquid mixture ratio and thereby improving fuel pressure controllability while maintaining injection flexibility.
2Device complexity
If a single fuel pump is used to supply fuel from main tank to sub tank and to engine, then device complexity is reduced, but fuel pressure controllability deteriorates due to gas-liquid mixture ratio fluctuation
Solution Approach 1:
The patent segments the fuel supply function into two separate pumps: a primary pump that supplies fuel from the main tank to the sub fuel tank, and a secondary pump that supplies chilled fuel from the sub tank to the engine. This segmentation allows independent control of each pump, enabling precise fuel pressure controllability at the secondary pump while maintaining a relatively simple overall device structure.
Solution Approach 2:
The patent introduces the sub fuel tank as an intermediary between the main fuel tank and the engine. This intermediary component provides a buffer zone where fuel can be chilled and where gas-liquid separation can occur, isolating the secondary pump from direct exposure to fluctuating gas-liquid mixtures and improving pressure controllability.
3Adaptability or versatility
If fuel is vaporized in the sub fuel tank, then fuel injection adaptability is improved, but liquid fuel ratio decreases causing engine performance reduction
Solution Approach 1:
The patent applies preliminary action by chilling the fuel in advance before it reaches the vaporization zone. The pre-chilled fuel resists excessive vaporization, maintaining a higher liquid fuel ratio while still allowing controlled gas fuel generation for injection adaptability. This preliminary cooling action prevents the fuel from vaporizing too readily in the sub fuel tank.
Solution Approach 2:
The patent changes the temperature parameter of the fuel to below its freezing point, which fundamentally alters the vaporization characteristics. This parameter change reduces the rate and extent of vaporization, maintaining a higher liquid fuel ratio in the mixture supplied to the secondary pump while still enabling sufficient gas fuel generation for adaptable injection.
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 solution effectively stabilizes the gas-liquid mixture ratio, enhancing fuel pressure controllability, ensuring appropriate fuel injection, and improving engine performance by maintaining a high ratio of liquid fuel and reducing the load on the secondary pump, thus increasing efficiency and reducing power consumption.
Implementation Method 1
a primary pump (8) suctioning fuel supplied from a fuel supply source to discharge the fuel to a first pipeline (10)
Implementation Method 2
a secondary pump (12) connected in series to the primary pump (8) via the first pipeline (10), and suctioning the fuel supplied from the primary pump (8) through the first pipeline (10) to supply the fuel through a second pipeline (15) to an engine side
Implementation Method 3
gas-liquid mixed fuel generated in the tank (11) by vaporizing the fuel flowing out from the outflow part (13)
Implementation Method 4
a third pipeline (21) connecting an interior of the tank (11) and a suction side of the primary pump (8), and returning, to the suction side of the primary pump (8), gas-liquid mixed fuel generated in the tank (11)
Implementation Method 5
a preloading part provided in one of portions of a circulation path formed between the primary pump and the tank by the first pipeline and the third pipeline, and preloading the fuel circulating through the circulation path
Data Source
AI summary
A fuel supply device of an engine includes a primary pump suctioning fuel to discharge the fuel to a first pipeline, a secondary pump connected in series to the primary pump via the first pipeline, and suctioning the fuel from the primary pump to supply the fuel through a second pipeline to an engine side, a tank storing the fuel and accommodating the secondary pump, an outflow part causing part of the fuel flowing from the first pipeline through the secondary pump to the second pipeline in the tank to flow outward, a third pipeline returning, to a suction side of the primary pump, gas-liquid mixed fuel generated by vaporizing the fuel flowing out from the outflow part, and a preloading part in one of portions of a circulation path formed between the primary pump and the tank by the first pipeline and the third pipeline and preloading the fuel.