Common rail system for DME fuel
A technology of common rail system and fuel system, applied in the field of common rail system, can solve problems such as difficult system configuration, influence, unfavorable lubricity and durability of common rail system, etc.
Inactive Publication Date: 2014-07-09
HYUNDAI MOTOR CO LTD
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Problems solved by technology
Therefore, it is difficult to configure the system
Component durability (i.e., fuel injection equipment (FIE), e.g., injectors) may be reduced when the properties of DME fuel cannot be maintained in a liquid state
[0003] In the common rail system for DME fuel according to the related art, when the low-pressure pump makes the fuel in a liquid state by pressurizing the fuel, since 400 liters or more per hour of DME fuel is pumped from the high-pressure pump and supplied to Common rails and injectors regardless of the amount of fuel consumed, thus generating pumping losses of the high pressure pump
[0004] In particular, since the return pressure of the DME fuel returned from the common rail and the injector is about 10 bar, when the temperature of the DME fuel rises to 40°C or higher, the phase of the DME fuel changes from a liquid phase In the gas phase, the lubricity and durability of the common rail system may be adversely affected
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[0020] Reference will now be made in detail to various embodiments of the invention, examples of which are illustrated in the accompanying drawings and described below. While the invention will be described in conjunction with exemplary embodiments, it will be understood that present description is not intended to limit the invention to those exemplary embodiments. On the contrary, the invention is intended to cover not only the exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims .
[0021] According to various aspects of the present invention, it is possible to maintain the return pressure of dimethyl ether (DME) fuel under liquid state maintenance conditions in order to ensure the lubricity and durability of components such as high pressure pumps and fuel injection devices (FIE) of common rail systems sex. Due to the prope...
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Common rail system for DME fuel. A common rail system for a dimethyl ether (DME) fuel in which a medium-pressure fuel system is disposed between a low-pressure fuel system and a high-pressure fuel system to improve the durability and reliability of the common rail system is provided. The low-pressure fuel system stores a DME fuel in a gaseous state. The medium-pressure fuel system maintains a DME fuel supplied from the low-pressure fuel system to a high-pressure fuel system or returned from the high-pressure fuel system to the low-pressure fuel system in a liquid state. The high-pressure fuel system receives the DME fuel maintained in the liquid state from the medium-pressure fuel system and supplies the DME fuel to an injector.
Description
technical field [0001] The present invention relates to a common rail system for dimethyl ether (DME) fuel, more particularly, to such a common rail system for DME fuel, in which system, between the low-pressure fuel line and the high-pressure fuel line A medium-pressure fuel line is provided between them to improve the durability and reliability of the common rail system. Background technique [0002] Common rail engines have recently been developed using dimethyl ether (DME) as an alternative fuel. However, due to the properties of DME fuel, gasification often occurs in DME fuel. Therefore, it is difficult to configure the system. When the properties of DME fuel cannot be maintained in a liquid state, durability of components (ie, fuel injection equipment (FIE), eg, injectors) may decrease. [0003] In the common rail system for DME fuel according to the related art, when the low-pressure pump makes the fuel in a liquid state by pressurizing the fuel, since 400 liters o...
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IPC IPC(8): F02M21/02
CPCF02M63/029F02M2200/953F02M55/025F02M21/02F02M55/02F02M37/00
Inventor 李柱光
Owner HYUNDAI MOTOR CO LTD