# US 7,406,950 B2 · Fuel supply apparatus of engine

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- Number: US 7,406,950 B2
- Document ID: US7406950B2
- Status: Granted
- Kind: B2
- Application number: 11/727,041
- Filed: 2007-03-23
- Published: 2007-10-25
- Granted: 2008-08-05
- Earliest claimed: 2006-04-19
- Assignees: Nikki Co., Ltd.
- Inventors: Umerujan Sawut; Masashi Iwasaki; Shinya Yamaguchi
- Web page: https://patentgrep.com/patent/US7406950B2

## CPC

- F02D 41/0025: {Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures}
- F02D 19/022: {to adjust the fuel pressure, temperature or composition}
- F02D 19/027: {Determining the fuel pressure, temperature or volume flow, the fuel tank fill level or a valve position}
- F02D 41/3082: {Control of electrical fuel pumps}
- F02M 21/0212: {comprising at least 3 C-Atoms, e.g. liquefied petroleum gas [LPG], propane or butane}
- F02M 21/0245: {High pressure fuel supply systems; Rails; Pumps; Arrangement of valves}
- F02M 37/0058: {Returnless fuel systems, i.e. the fuel return lines are not entering the fuel tank}
- F02D 2200/0602: Fuel pressure
- F02D 2250/31: Control of the fuel pressure
- F02M 21/06: Apparatus for de-liquefying, e.g. by heating
- Y02T 10/30: Use of alternative fuels, e.g. biofuels
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The invention can avoid an energy dissipation and a consumption of an apparatus by minimizing a driving amount of a fuel pump and maintain an improved fuel supply state, in a fuel supply system injecting a liquefied gas fuel by an injector and supplying to an engine. In a return-less type engine fuel supply apparatus provided with a fuel supply pipe line (9) extended from a fuel tank (2) and having an injector (8) in a leading end side, a motor-driven fuel pump (3), and an electronic control unit (12) drive controlling the fuel pump (3) and the injector (8), a pressure sensor (13) detecting a fuel pressure so as to output to the electronic control unit (12) is arranged at a position near the injector (8) in the fuel supply pipe line (9) where a fuel pressure approximately coincides with a fuel injection pressure, the electronic control unit feedback controls the operation of the fuel pump (3) on the basis of the detected fuel pressure in such a manner that the fuel injection pressure maintains a predetermined target pressure, and the fuel pump (3) is arranged outside an engine room (50).

## Claims

### Claim 1

A return-less type engine fuel supply apparatus comprising a fuel supply pipe line extended from a fuel tank and having an injector in a leading end side, a motor-driven fuel pump arranged in the fuel supply pipe line, and an electronic control unit drive controlling the fuel pump and the injector, and pressurizing a liquefied gas fuel stored in the fuel tank by the fuel pump so as to feed to the injector through the fuel supply pipe line and supply to the engine,
wherein a pressure sensor detecting a fuel pressure so as to output to the electronic control unit is arranged at a position near the injector in the fuel supply pipe line where a fuel pressure approximately coincides with a fuel injection pressure, the electronic control unit feedback controls the operation of the fuel pump on the basis of the detected fuel pressure in such a manner that the fuel injection pressure maintains a predetermined target pressure, and the fuel pump is arranged outside an engine room.

### Claim 2 (depends on 1)

An engine fuel supply apparatus as claimed in claim 1, wherein the fuel pump has a fuel discharge amount maintaining a fuel pressure just before an injection which fluctuates in accordance with a fluctuation of the engine rotating speed.

### Claim 3 (depends on 1)

An engine fuel supply apparatus as claimed in claim 1, wherein a piping length of a pressurizing piping arranged in a downstream side of the fuel pump is equal to or more than piping inner diameter×250.

### Claim 4 (depends on 1)

An engine fuel supply apparatus as claimed in claim 1, wherein the fuel pump is arranged in a trunk room near the fuel tank.