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Fuel supply system

A fuel supply device and fuel supply technology, which are applied in the directions of fuel injection device, fuel supply device, charging system, etc., can solve problems such as volume change and fuel leakage

Active Publication Date: 2014-11-05
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, if the components forming the return flow path and the fuel injection valve are cooled, their volume changes
Therefore, if the temperature of the fuel in the return flow path is lowered to make the fuel in a liquid state, a gap is likely to be formed at the connecting portion between the member forming the return flow path and the discharge portion of the fuel injection valve, and the fuel may flow from the formed The gap leaks

Method used

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no. 1 Embodiment approach

[0053] use Figure 1 to Figure 8 A first embodiment of the present invention will be described. figure 1 It is an overall configuration diagram showing the outline of the fuel supply device according to the first embodiment.

[0054] The fuel supply device 20 of the present embodiment is a fuel supply device for the internal combustion engine 10 using DME (dimethyl ether), which is a type of liquefied gas, as a fuel. Such as figure 1 As shown, the fuel supply device 20 includes a fuel tank 21, a feed pump (feed pump) 25, a high-pressure pump 29, a common rail (common rail) 36, a fuel injection valve 44, a fuel cooler 42, 43 etc. In addition, these constituent units are connected to each other by fuel pipes 80 to 85 .

[0055] The fuel tank 21 stores DME (hereinafter simply referred to as fuel) which is a fuel composed of liquefied gas. The fuel in the fuel tank 21 is pressurized at a pressure corresponding to the vapor pressure of the fuel. Thereby, the fuel in the fuel ...

no. 2 Embodiment approach

[0132] Hereinafter, a second embodiment of the present invention will be described based on the drawings. The control of the fuel supply device 20 of the second embodiment is a modified example of the control of the fuel supply device 20 of the first embodiment.

[0133] In the control of the first embodiment, the control ranges of the passage pressure Phg and the passage temperature Thg are such that the fuel pressure exceeds the vapor pressure Pv and falls below the maximum allowable pressure Pmax, and the fuel temperature exceeds the lower limit temperature Tmin and The range below the upper limit temperature Tmax. If the passage pressure Phg and the passage temperature Thg are controlled within such a range, there is a possibility that the state of the fuel in the cover passage 11b cannot be stably brought into a liquid state. In contrast, in this modified example, the channel pressure Phg is controlled to satisfy (Pv+ΔPvt) Figure 4 within the range of the single dotted l...

no. 3 Embodiment approach

[0138] Hereinafter, a third embodiment of the present invention will be described based on the drawings. Figure 9 The fuel supply device 120 of the third embodiment shown does not discharge the discharged fuel from the fuel injection valve 44 to the cap passage 11b, but discharges the discharged fuel from the fuel injection valve 44 to the point extending from the feed switching valve 40 to the The fuel pipe 85 of the back pressure valve 115 is different from the fuel supply device 20 of the first embodiment in this point. In this case, since the fuel pipe 85 is provided close to the internal combustion engine 10 , it is likely to receive heat from the internal combustion engine 10 , and there is a possibility that vaporized fuel may be mixed into the fuel in the fuel pipe 85 . In addition, in this embodiment, the pressure sensor 13 and the temperature sensor 14 which detect the state of the fuel in the fuel pipe 85 are provided in the fuel pipe 85 .

[0139] In addition, in...

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Abstract

A fuel supply system (20) supplying fuel formed by liquefied gas into a combustion motor (10) is configured to control fuel supply to a cover channel (11b) and fuel discharge from a cover channel (11b) based on a channel pressure (Phg),a channel temperature (Thg) and a vapour pressure (Pv). The fuel in a return flow (11b) keeps a liquid state smaller than an allowable pressure (Pmax) at a temperature higher than a minimum temperature (Tmin) and lower than a maximum temperature (Tmax). Accordingly, the motion of a fuel injection valve using dry gas fuel is stable, an injection quantity is corresponding with a quantity of opening the valve and a fuel leakage resistance performance of a fuel system of a fuel injection valve and a return flow.

Description

technical field [0001] The present invention relates to a fuel supply device for supplying fuel composed of liquefied gas to an internal combustion engine. Background technique [0002] There is known a fuel supply device that supplies fuel composed of liquefied gas such as dimethyl ether (hereinafter referred to as DME) to an internal combustion engine instead of diesel fuel such as light oil. For example, Patent Document 1 (Japanese Unexamined Patent Publication No. 2010-196471) and Patent Document 2 (Japanese Unexamined Patent Publication No. 2010-203286 ) disclose that when the internal combustion engine starts to operate, the feed pump is controlled so that the fuel pressure at the inlet of the high-pressure pump becomes a vapor A fuel supply device with a pressure at which the DME obtained from the manometric diagram does not vaporize. [0003] In the fuel supply device of Patent Document 1, when the fuel pressure at the inlet of the high-pressure pump reaches a press...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D19/00F02M55/00F02M21/08
CPCY02T10/123Y02T10/34Y02T10/12Y02T10/30
Inventor 加藤正明竹内久晴人见克彦
Owner DENSO CORP