LPI fuel system and return fuel minimizing method

A minimization, fuel oil technology, applied in the direction of charging system, condensed fuel collection/return, oil supply device, etc., to avoid the increase of pump noise, lower cost, and avoid the effect of reduction

Inactive Publication Date: 2013-12-04
HYUNDAI MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Therefore, conventional solutions cannot overcome various problems caused by LPI with a fuel return line system having an inner diameter of about 6mm

Method used

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  • LPI fuel system and return fuel minimizing method
  • LPI fuel system and return fuel minimizing method
  • LPI fuel system and return fuel minimizing method

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Embodiment approach

[0101] According to the exemplary embodiment of the present invention, since the diameter of the fuel return line becomes smaller and the pressure regulator can be removed by reducing the return flow rate, it is possible to build the system at a relatively inexpensive cost.

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Abstract

The invention discloses an LPI fuel system and a return fuel minimizing method. A return fuel minimizing logic of a fuel pump may include: after the fuel pump may be driven by detecting a key-on (IG ON) of an engine, the pressure difference [Delta]P (=the bombe fuel pressure P[bombe]-the fuel injection pressure P[injector]) may be detected, and then the target pressure [Delta]P[target] may be set to the engine starting pressure P[start] or at least four different engine running pressures P[running] so that the duty can be maintained, increased or decreased by controlling the fuel pump to optimize the flow rate discharged from the pump, considering the difference of the magnitude between the pressure difference [Delta]P and the target pressure [Delta]P[target], by which the return flow rate which may be affected by the engine heat and the air temperature, can be reduced.

Description

[0001] Cross references to related applications [0002] This application claims priority from Korean Patent Application No. 10-2012-0055239 filed on May 24, 2012, and the entire content of this application is incorporated herein for all purposes of this citation. Technical field [0003] The exemplary embodiment of the present invention relates to an LPI fuel system, and more specifically, to an LPI fuel system that adopts a method of minimizing return fuel, so that the operability of the fuel pump and the filling of the gas tank can be improved by the following means Performance: According to whether the engine is ignited or not, the fuel discharge speed is changed, and after the engine is started, the fuel discharge speed of the fuel pump is optimized through feedback control based on the engine load. Background technique [0004] Generally, the LPI (liquefied petroleum injection) engine is different from the LPG engine in that the fuel is supplied in a liquid state in the case o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M33/02F02M37/04
CPCF02D1/02Y02T10/32F02M21/0212F02D41/3082F02D2200/0602F02M21/02F02M37/00F02M51/02
Inventor 咸昌昊
Owner HYUNDAI MOTOR CO LTD
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