Fuel Supply System Pressure Pulsation Absorption
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Solution Overview
Problem
Existing fuel supply systems for internal combustion engines using liquefied gas fuels like dimethyl ether (DME) face challenges with pressure pulsation in high-pressure pumps, leading to inefficient fuel supply and potential oil leaks, which are difficult to mitigate with conventional pulsation dampers due to volume constraints and material compatibility issues.
Innovation Solution
A fuel supply system that includes a pressure chamber communicating with the fuel gallery, where the fuel is heated to a gas-liquid phase, allowing volume changes in the liquid phase to be compensated by the gas-liquid phase, thereby absorbing pressure pulsations without the need for large pulsation dampers or bladder accumulators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bladder type accumulator or pulsation damper is provided to reduce pressure pulsation in the fuel gallery, then pressure pulsation is reduced, but the system becomes complex and requires special rubber materials for DME fuel
Solution Approach 1:
The patent changes the physical state parameter of the fuel by heating it in the pressure chamber to create a gas-liquid mixture. This phase change enables the fuel itself to act as a pulsation absorber, eliminating the need for external accumulators or dampers and their associated complexity.
Solution Approach 2:
The fuel in gas-liquid phase within the pressure chamber serves its dual function of both fuel supply and pressure pulsation absorption. The system uses its own fuel in a different phase to absorb pulsations, rather than requiring separate dedicated pulsation absorption devices.
2Reliability
If the volume of the accumulator or pulsation damper is increased to absorb pressure pulsation effectively, then pressure pulsation absorption improves, but the system size becomes too large for vehicle installation
Solution Approach 1:
By changing the phase of the fuel from liquid to gas-liquid mixture through heating, the patent enables effective pressure pulsation absorption within a compact volume. The gas phase provides compressibility that allows pulsation absorption without requiring large accumulator volumes.
Solution Approach 2:
The patent utilizes phase transition of the fuel from liquid to gas-liquid state in the pressure chamber. This phase transition enables the fuel to absorb pressure pulsations effectively while maintaining a compact system volume suitable for vehicle installation.
3Productivity
If liquid phase fuel is used in the fuel gallery, then fuel supply is efficient, but pressure pulsation causes insufficient fuel suction and oil-tight deterioration
Solution Approach 1:
The patent changes the phase parameter of the fuel by heating it in the pressure chamber, creating a gas-liquid mixture that absorbs pressure pulsations. This prevents the pulsations from causing insufficient fuel suction and oil-tight deterioration while maintaining efficient fuel supply.
Solution Approach 2:
The heated fuel in gas-liquid phase acts as an intermediary medium between the feed pump and the injection system. It absorbs pressure pulsations that would otherwise cause fuel suction insufficiency and oil-tight deterioration, while still allowing efficient fuel supply.
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 configuration effectively absorbs pressure pulsations in the fuel gallery, ensuring stable fuel supply and preventing oil leaks, while allowing for compact system design and efficient operation with liquefied gas fuels like DME.
Implementation Method 1
The fuel in the pressure chamber receives heat energy from a heat source so that the fuel is brought into gas-liquid phase
Implementation Method 2
The fuel in the pressure chamber receives heat energy from a heat source
Implementation Method 3
a volume change of the fuel in liquid phase in the fuel gallery can be compensated by a volume change of the fuel in gas phase or gas-liquid phase in the pressure chamber. Thus, the pressure pulsation in the fuel gallery is absorbed in the pressure chamber
Data Source
AI summary
A fuel supply system has a pressure chamber which communicates with a fuel gallery. The pressure chamber receives the fuel from the feed pump or the returned fuel from the fuel gallery. The fuel in the pressure chamber receives heat energy from the engine E so that the fuel is brought into gas-liquid phase. A volume change of the fuel in liquid phase in the fuel gallery can be compensated by a volume change of the fuel in gas phase or gas-liquid phase in the pressure chamber. Thus, the pressure pulsation in the fuel gallery is absorbed in the pressure chamber.