Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
  • F02M37/04—Feeding by means of driven pumps
  • F02M37/08—Feeding by means of driven pumps electrically driven
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
  • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
  • B60K15/03—Fuel tanks
  • B60K15/035—Fuel tanks characterised by venting means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
  • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
  • F02M37/04—Feeding by means of driven pumps
  • F02M37/14—Feeding by means of driven pumps the pumps being combined with other apparatus
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
  • F02M37/20—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines characterised by means for preventing vapour lock

Definitions

• the subject invention relates to a system for supplying fuel under pressure to an internal combustion engine, and, more specifically, to controlling fuel delivery to a fuel injection system in an internal combustion engine having a low pressure pump formed integrally as at least part of a main housing of a vapor separator assembly.
• this system suffers from having a low pressure lift pump 18 located outside of the vapor separator 40. This requires additional mounting hardware and fuel hose routings, which increase the costs and leakage points of fuel.
• U.S. Pat. No. 6,390,871 discloses a fuel reservoir mounted to a driveshaft housing of an outboard motor.
• a first fuel pump 20 is a lift pump which draws fuel from a fuel tank and pumps the fuel into the cavity 12 of the reservoir 10.
• a second fuel pump 30 is a high pressure pump which draws fuel from the cavity and pumps the fuel at a higher pressure to a fuel rail of an engine. Both the first and second pumps are disposed within a volume of fuel stored in the fuel reservoir.
• the subject invention overcomes the disadvantages of the prior art by eliminating leakage points and increased costs associated with assembly. Rather, a low pressure lift pump, such as a pulse pump, is integrally formed at least in part with the vapor separator.
• the pump for example, may be located internally, externally or partly internally and partly externally to the vapor separator. This, in turn, eliminates the added design and fabrication costs of a prior art, and reduces the risk of fuel leakage.
• a fuel vapor separator including a housing, a low pressure pump delivering fuel from to the vapor separator and a high pressure pump delivering fuel to an engine, wherein the low pressure pump is formed at least in part as a single piece of material with the housing.
• the low pressure pump may be internal or external to the housing.
• a reservoir in the housing has a cavity to contain liquid fuel for use by an engine, wherein the high pressure pump draws fuel from the cavity and pumps fuel to the engine, and the low and high pressure pumps are disposed in thermal communication with the fuel when the fuel is within the cavity.
• a hollow tube is configured into a coil having a plurality of loops, the coil dimensions to fit within the interior of the housing, the tube having first and second ends extending through the housing for connection to respective coolant supply and discharge members.
• a decoupled float valve vents vapor from the vapor separator when the fuel in the cavity falls below a predetermined level.
• a pressure relief valve opens when a predetermined pressure is reached within the cavity to vent fuel vapor from the cavity.
• a fuel supply system for a marine engine including a vapor separator receiving liquid fuel from a fuel tank and collecting vapors given off from the fuel, the vapor separator including a housing having an interior and an exterior; a high pressure pump received in a main body of the vapor separator, and having an inlet in
• a reservoir has a cavity to contain liquid fuel for use by an engine, wherein the high pressure pump draws fuel from the cavity and pumps fuel to the engine, and the low and high pressure pumps are disposed in thermal communication with the fuel when the fuel is within the cavity.
• a hollow tube is configured into a coil having a plurality of loops, the coil dimensions to fit within the interior of the housing, the tube having first and second ends extending through the housing for connection to respective coolant supply and discharge members.
• a decoupled float valve vents vapor from the vapor separator when the fuel in the cavity falls below a predetermined level.
• a pressure relief valve opens when a predetermined pressure is reached within the cavity to vent fuel vapor from the cavity.
• a vapor separator for a fuel pump assembly of an internal combustion engine including a reservoir having a cavity for containing fuel for use by the engine; and a low pressure pump providing the fuel to the reservoir, wherein the low pressure pump is integrally formed as at least part of a main body of the vapor separator.
• a high pressure pump draws the fuel from the cavity and pumping the fuel to the engine, and being disposed within the cavity of the reservoir and in thermal communication with the fuel when the fuel is within the cavity.
• a hollow tube is configured into a coil having a plurality of loops, the coil dimensions to fit within the interior of the main body, the tube having first and second ends extending through the main body for connection to respective coolant supply and discharge members.
• the low pressure pump may be disposed in a location external or internal to the reservoir.
• FIG. 1 is a schematic diagram of a marine vapor separator with a bypass line in accordance with the prior art.
• FIG. 2 is a schematic representation of a fuel system for a marine propulsion system in accordance with the prior art.
• FIG. 3 is a schematic diagram according to the invention where the low pressure pump is formed integrally with the vapor separator.
• FIG. 3 a fuel supply system for a marine internal combustion engine in is illustrated schematically in FIG. 3.
• FIG. 3 illustrates a fuel vapor separator 50 having a main body 52 formed of polymeric materials that is adapted to received a supply of liquid fuel and provide a substantially vapor free supply of liquid fuel to fuel pump 54.
• the fuel pump 54 is preferably carried by the fuel vapor separator 50 and may be an electric motor driven fuel pump having an inlet in communication with the supply of liquid fuel in the main body 52 and an outlet 56 through which pressurized fuel is discharged for delivery to an engine.
• Fuel is pumped from a tank using a low pressure lift pump 60 into a reservoir of the vapor separator 50.
• the low pressure lift pump 60 is formed integrally with the vapor separator 50. That is, at least part of the low pressure lift pump is formed from the same material and integral with the vapor separator body 50.
• the low pressure pump may reside external to the vapor separator 50, as illustrated in Fig. 3, or it may reside internal to the vapor separator (not illustrated), as well known in the art.
• the low pressure pump and vapor separator may be formed from the same material to create a single continuous unit.
• the low pressure pump 60 is a pulse type pump.
• a pulse fuel pump typically has four tubes connected to it. One tube connects the fuel tank. Two tubes connect to the crankcase of the engine and one tube connects to the inlet of the fuel vapor separator. When the engine revolves, the tube connecting the engine delivers fuel with a pulse of pressure at each revolution. The diaphragm pulsates with the pressure.
• At the top of the pump are two chambers, which are separated by a pair of one way valves. These valves ensure that the fuel that passes through does not come back. Fuel flows from one chamber to the other at one pulse and at the next pulse, fuel moves to the engine.
• fuel is routed from a tank (not illustrated) via a low- pressure type lift pump 60, such as a pulse pump, which urges fuel into a vapor separator, generally indicated at 50.
• the vapor separator 50 thus receives liquid fuel from a fuel tank through a direct distribution system.
• the primary purpose of the vapor separator 50 is to collect and discharge vapors given off from the fuel.
• the low pressure pump 60 is integrally formed as at least part of the vapor separator 50 and continually adds more liquid fuel to a reservoir of vapor separator 50.
• the vapor vent 58 allows vapors to bleed off.
• the vapor vent 58 is controlled by a float valve, preferably decoupled 64, which is
• the float valve automatically closes. In all non-threatening conditions, the vapor vent 58 remains open to exhaust fuel vapors.
• the high pressure pump 54 has a fuel inlet for withdrawing liquid fuel from the reservoir region of the vapor separator 50.
• the high pressure pump 54 also has a fuel outlet 56 for delivering fuel under pressure to an engine injector system.
• the engine injector system can be of any type suited to vaporize fuel for a marine engine (not shown). In the typical case, the engine injector system includes a plurality of injectors.
• the high-pressure pump 54 is designed to run continuously whenever the engine is in operation.
• the pump 54 is also rated to provide maximum fuel delivery and pressure for engine 'full throttle' conditions. However, because an engine is not run at full throttle condition at all times, the pump 54 will attempt to deliver more fuel than is needed during other (non 'full throttle') conditions.
• a bypass or return line may extend between the fuel delivery line and the vapor separator 50 (not shown). The bypass or return line returns excess fuel to the vapor separator 50 prior to the fuel reaching the engine injector system and thereby eliminates the need to recirculate unused fuel through the engine injector system.
• fuel is supplied to the engine by first moving liquid fuel from a fuel tank (not shown) to the vapor separator 50 by use of the low pressure pump 60. Water is separated from the fuel prior to reaching the low pressure pump. In the vapor separator 50, vapors given off from the fuel are collected and vented, or bled, to the atmosphere or other suitable collection system. The float valve automatically interrupts the vapor bleeding in response to the level of liquid fuel in the vapor separator 50 reaching a predetermined height to prevent the escape of liquid fuel through the vapor vent 58.
• the high pressure pump 54 withdraws liquid fuel from the vapor separator 50 and delivers it under pressure to the engine injector system via a fuel delivery line (fuel out 56). However, the fuel pressure between the high pressure pump 54 and the engine injector system is monitored to determine whether the engine injector system is being presented with more fuel than is required for efficient engine operation. If more fuel than needed is being supplied by the high pressure pump 54, the extra, unneeded fuel may be automatically returned to the vapor separator 50 through a bypass or return line. Thus, fuel in excess of engine demand is returned to the vapor separator 50 prior to its reaching the engine injector system.
• a hollow cylindrical tube 62 which is bent and configured into a coil having multiple circular loops.
• An intake end is connected to a source of liquid coolant (not shown) which in the case of a Marine engine is typically a pump that pumps water from the lake or ocean water environment in which the engine is operating into the engine for cooling purposes.
• the coolant water typically is used to cool the combustion chambers of the engine as well as the vapor separator assembly 50.
• the lake or ocean water or other liquid coolant is pumped through tube coil 62 from the first end to a second outlet end thereby removing heat from the interior of main body 52 of vapor separator assembly 20.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Sustainable Development (AREA)
• Sustainable Energy (AREA)
• Transportation (AREA)
• Fuel-Injection Apparatus (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (6)

Cited By (1)

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Citations (7)

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• 2011
  • 2011-01-07 EP EP11700301.2A patent/EP2521852B1/en not_active Not-in-force
  • 2011-01-07 WO PCT/US2011/020454 patent/WO2011085156A1/en not_active Ceased
  • 2011-01-07 US US12/986,622 patent/US20110168138A1/en not_active Abandoned
  • 2011-01-07 KR KR1020127020768A patent/KR20120112776A/ko not_active Ceased
  • 2011-01-07 CN CN2011800113292A patent/CN102782298A/zh active Pending
  • 2011-01-07 JP JP2012548133A patent/JP2013516576A/ja active Pending

Patent Citations (7)

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