CA2150324A1 - Fuel system for fuel injected two stroke engine - Google Patents
Fuel system for fuel injected two stroke engineInfo
- Publication number
- CA2150324A1 CA2150324A1 CA002150324A CA2150324A CA2150324A1 CA 2150324 A1 CA2150324 A1 CA 2150324A1 CA 002150324 A CA002150324 A CA 002150324A CA 2150324 A CA2150324 A CA 2150324A CA 2150324 A1 CA2150324 A1 CA 2150324A1
- Authority
- CA
- Canada
- Prior art keywords
- fuel
- outlet
- return
- communicating
- pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 163
- 238000002485 combustion reaction Methods 0.000 claims abstract description 13
- 239000002828 fuel tank Substances 0.000 claims abstract description 12
- 238000005086 pumping Methods 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000010276 construction Methods 0.000 description 6
- 239000007787 solid Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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
- F02M37/0047—Layout or arrangement of systems for feeding fuel
- F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
- F02M37/0058—Returnless fuel systems, i.e. the fuel return lines are not entering the fuel tank
-
- 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
- F02M37/0076—Details of the fuel feeding system related to the fuel tank
- F02M37/0088—Multiple separate fuel tanks or tanks being at least partially partitioned
-
- 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
- F02M37/18—Feeding by means of driven pumps characterised by provision of main and auxiliary pumps
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Disclosed herein is a fuel supply system for an internal combustion engine comprising a remote fuel tank, a first crankcase operated fuel pump including a fuel pumping chamber having a fuel inlet communicating with the fuel tank and a fuel outlet, a vapor separator including a fuel inlet communicating with the outlet of the first fuel pump, a fuel vapor outlet, a liquid fuel outlet, and a return fuel inlet, a second crankcase operated fuel pump including a fuel inlet communicating with the outlet of the vapor separator, and a fuel outlet, and a fuel injector including a nozzle adapted to communicate with a combustion chamber, a fuel inlet communicating with the fuel outlet of the second fuel pump, and a return outlet communicating with the return fuel inlet of the vapor separator.
Description
FUEL SYSTEM FOR FUEL INJECTED TWO STROKE ENGINE
BACKGROUND OF THE INVENTION
The invention relates generally to two stroke fuel injected internal combustion engines and, in particular, to fuel systems therefor.
Attention is directed to the following United States Patents:
4,093,403 Schrimpf et al.
4,096,692 Nakamura et al.
4,395,995 Crain 4,562,820 Jiminez 4,732,131 Hensel 5,137,002 Mahoney et al.
SUMMARY OF THE INVENTION
The invention provides a fuel supply system for an internal combustion engine comprising a remote fuel tank, a first crankcase operated fuel pump including a fuel pumping chamber having a fuel inlet communicating with the fuel tank and a fuel outlet, a vapor separator including a fuel inlet communicating with the outlet of the first fuel pump, a fuel vapor outlet, a liquid fuel outlet, and a return fuel inlet, a second crankcase operated fuel pump including a fuel inlet communicating with the outlet of the vapor separator, and a fuel outlet, and a fuel injector including a nozzle adapted to communicate with a combustion chamber, a fuel inlet communicating with the fuel outlet of the second fuel 2~0324 pump, and a return outlet communicating with the return fuel inlet of the vapor separator.
The invention also provides a fuel supply system for an internal combustion engine comprising a remote fuel tank, a first crankcase operated fuel pump including a diaphragm defining a pressure chamber adapted to be connected to a source of pulsating pressure and a fuel pumping chamber having a fuel inlet communicating with the fuel tank and a fuel outlet, a vapor separator including a fuel inlet communicating with the outlet of the first fuel pump, a fuel vapor outlet, a liquid fuel outlet, and a return fuel inlet, a second crankcase operated fuel pump including a diaphragm defining a pressure chamber adapted to be connected to a source of pulsating pressure and a fuel pumping chamber including a fuel inlet communicating with the outlet of the vapor separator, and a fuel outlet, a link connecting the diaphragms for common movement, and a fuel injector including a nozzle adapted to communicate with a combustion chamber, a fuel inlet communicating with the fuel outlet of the second fuel pump, and a return outlet communicating with the return fuel inlet of the vapor separator.
Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims, and drawings.
Page Not Submitted.
BACKGROUND OF THE INVENTION
The invention relates generally to two stroke fuel injected internal combustion engines and, in particular, to fuel systems therefor.
Attention is directed to the following United States Patents:
4,093,403 Schrimpf et al.
4,096,692 Nakamura et al.
4,395,995 Crain 4,562,820 Jiminez 4,732,131 Hensel 5,137,002 Mahoney et al.
SUMMARY OF THE INVENTION
The invention provides a fuel supply system for an internal combustion engine comprising a remote fuel tank, a first crankcase operated fuel pump including a fuel pumping chamber having a fuel inlet communicating with the fuel tank and a fuel outlet, a vapor separator including a fuel inlet communicating with the outlet of the first fuel pump, a fuel vapor outlet, a liquid fuel outlet, and a return fuel inlet, a second crankcase operated fuel pump including a fuel inlet communicating with the outlet of the vapor separator, and a fuel outlet, and a fuel injector including a nozzle adapted to communicate with a combustion chamber, a fuel inlet communicating with the fuel outlet of the second fuel 2~0324 pump, and a return outlet communicating with the return fuel inlet of the vapor separator.
The invention also provides a fuel supply system for an internal combustion engine comprising a remote fuel tank, a first crankcase operated fuel pump including a diaphragm defining a pressure chamber adapted to be connected to a source of pulsating pressure and a fuel pumping chamber having a fuel inlet communicating with the fuel tank and a fuel outlet, a vapor separator including a fuel inlet communicating with the outlet of the first fuel pump, a fuel vapor outlet, a liquid fuel outlet, and a return fuel inlet, a second crankcase operated fuel pump including a diaphragm defining a pressure chamber adapted to be connected to a source of pulsating pressure and a fuel pumping chamber including a fuel inlet communicating with the outlet of the vapor separator, and a fuel outlet, a link connecting the diaphragms for common movement, and a fuel injector including a nozzle adapted to communicate with a combustion chamber, a fuel inlet communicating with the fuel outlet of the second fuel pump, and a return outlet communicating with the return fuel inlet of the vapor separator.
Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims, and drawings.
Page Not Submitted.
- 21 ~032~
DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic view of a fuel supply system embodying various of the features of the invention.
sefore one embodiment of the invention is explained in detail, it is to be understood that the invention is not limited in its application to the details of the construction and the arrangements of components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
GENERAL DESCRIPTION
Shown in the drawings is a fuel supply system ll for an internal combustion engine (not shown). The system 11 includes first and second crankcase pressure operated fuel pumps 13 and 15 which can be of any suitable construction and which respectively include diaphragms 17 which define respective pressure chambers 21 and fuel pumping chambers 23, and which are connected for common movement by a suitable link or member 18. The pressure chambers 21 are respectively connected by conduits or ducts 24 to an appropriate crankcase (not shown) of the associated two stroke 21S0~2~,1 engine. Each of the fuel pumping chambers 23 includes a fuel inlet 25 and a fuel outlet 27.
The system 11 also includes a fuel tank 41 which can be of any suitable construction and which is located remotely from the first fuel pump 13 and which is connected to the fuel inlet 25 of the first fuel pump 13 by a conduit or fuel line 43.
The system 11 also includes a vapor separator 51 which can be of any suitable construction and which comprises a tank or container 53 and includes a fuel inlet 55 located near the top of the tank 53, a liquid fuel outlet 57 located near the bottom of the tank 53, a fuel vapor outlet 59 located at the top of the tank 53, and a return fuel inlet 61 located midway between the top and bottom of the tank 53.
The fuel inlet 55 is connected by a conduit or fuel line 63 to the fuel outlet 27 of the first fuel pump 13. The liquid fuel outlet 57 is connected by a conduit or fuel line 65 with the fuel inlet 25 of the second fuel pump 15. The fuel vapor outlet 59 is connected by a suitable conduit or duct 67 to the air intake (not shown) of the associated engine.
The system 11 also includes a plurality of fuel injectors 71 which can be of any suitable construction and which respectively includes a nozzle 72 adapted to supply fuel to a combustion chamber (not shown), a fuel inlet 73 connected by a conduit or fuel line 75 with the fuel outlet 27 of the second fuel pump 15, and a 21~03~
fuel return outlet 77 connected by a conduit or fuel line 79 to the return fuel inlet 61 of the vapor separator 51.
In operation, the pulsing pressures produced in the crankcase of the associated two stroke engine are applied to the pressure chambers 21 of the fuel pumps 13 and 15 to cause reciprocation of the diaphragms 17 to cause fuel pumping by the first fuel pump 13 from the remote fuel tank 41 to the fuel inlet 55 of the vapor separator 51. Such reciprocation of the diaphragms 17 also causes operation of the second pump 15 to draw (solid) liquid fuel (without vapor) from the tank 53 of the vapor separator 51 and to deliver such fuel to the fuel inlets 73 of the fuel injectors 71 at an increased pressure of approximately 10 lbs.
pressure. Fuel which is in excess of that required by the nozzles 72 of the fuel injectors 71 is returned to the tank 53 of the vapor separator 51 through the fuel return line 79. Such recirculation of excess fuel serves to cool the fuel injectors 71.
As a consequence of the above construction, the first fuel pump 13 is capable of lifting fuel from the remote tank 41 and of delivering such fuel at relatively low pressure to the vapor separator 51 which serves to effect removal from the fuel of any vapor so that fuel delivered to the fuel injectors 71 from the second fuel pump 15 is solid, i.e. is without vapor.
Furthermore, the second fuel pump 15 sufficiently 21~032~
-additionally pressurizes the fuel such that formation of fuel vapor is substantially prevented. In addition, as already pointed out, the system 11 is designed such that excess fuel is delivered to the fuel injectors 71, S thus providing a flow of fuel which recirculates or returns to the vapor separator 71 and which serves to cool the fuel injectors 71. Such cooling also serves to minimize the possibility of the reformation of fuel vapor.
Various of the features of the invention are set forth in the following claims.
DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic view of a fuel supply system embodying various of the features of the invention.
sefore one embodiment of the invention is explained in detail, it is to be understood that the invention is not limited in its application to the details of the construction and the arrangements of components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
GENERAL DESCRIPTION
Shown in the drawings is a fuel supply system ll for an internal combustion engine (not shown). The system 11 includes first and second crankcase pressure operated fuel pumps 13 and 15 which can be of any suitable construction and which respectively include diaphragms 17 which define respective pressure chambers 21 and fuel pumping chambers 23, and which are connected for common movement by a suitable link or member 18. The pressure chambers 21 are respectively connected by conduits or ducts 24 to an appropriate crankcase (not shown) of the associated two stroke 21S0~2~,1 engine. Each of the fuel pumping chambers 23 includes a fuel inlet 25 and a fuel outlet 27.
The system 11 also includes a fuel tank 41 which can be of any suitable construction and which is located remotely from the first fuel pump 13 and which is connected to the fuel inlet 25 of the first fuel pump 13 by a conduit or fuel line 43.
The system 11 also includes a vapor separator 51 which can be of any suitable construction and which comprises a tank or container 53 and includes a fuel inlet 55 located near the top of the tank 53, a liquid fuel outlet 57 located near the bottom of the tank 53, a fuel vapor outlet 59 located at the top of the tank 53, and a return fuel inlet 61 located midway between the top and bottom of the tank 53.
The fuel inlet 55 is connected by a conduit or fuel line 63 to the fuel outlet 27 of the first fuel pump 13. The liquid fuel outlet 57 is connected by a conduit or fuel line 65 with the fuel inlet 25 of the second fuel pump 15. The fuel vapor outlet 59 is connected by a suitable conduit or duct 67 to the air intake (not shown) of the associated engine.
The system 11 also includes a plurality of fuel injectors 71 which can be of any suitable construction and which respectively includes a nozzle 72 adapted to supply fuel to a combustion chamber (not shown), a fuel inlet 73 connected by a conduit or fuel line 75 with the fuel outlet 27 of the second fuel pump 15, and a 21~03~
fuel return outlet 77 connected by a conduit or fuel line 79 to the return fuel inlet 61 of the vapor separator 51.
In operation, the pulsing pressures produced in the crankcase of the associated two stroke engine are applied to the pressure chambers 21 of the fuel pumps 13 and 15 to cause reciprocation of the diaphragms 17 to cause fuel pumping by the first fuel pump 13 from the remote fuel tank 41 to the fuel inlet 55 of the vapor separator 51. Such reciprocation of the diaphragms 17 also causes operation of the second pump 15 to draw (solid) liquid fuel (without vapor) from the tank 53 of the vapor separator 51 and to deliver such fuel to the fuel inlets 73 of the fuel injectors 71 at an increased pressure of approximately 10 lbs.
pressure. Fuel which is in excess of that required by the nozzles 72 of the fuel injectors 71 is returned to the tank 53 of the vapor separator 51 through the fuel return line 79. Such recirculation of excess fuel serves to cool the fuel injectors 71.
As a consequence of the above construction, the first fuel pump 13 is capable of lifting fuel from the remote tank 41 and of delivering such fuel at relatively low pressure to the vapor separator 51 which serves to effect removal from the fuel of any vapor so that fuel delivered to the fuel injectors 71 from the second fuel pump 15 is solid, i.e. is without vapor.
Furthermore, the second fuel pump 15 sufficiently 21~032~
-additionally pressurizes the fuel such that formation of fuel vapor is substantially prevented. In addition, as already pointed out, the system 11 is designed such that excess fuel is delivered to the fuel injectors 71, S thus providing a flow of fuel which recirculates or returns to the vapor separator 71 and which serves to cool the fuel injectors 71. Such cooling also serves to minimize the possibility of the reformation of fuel vapor.
Various of the features of the invention are set forth in the following claims.
Claims (4)
1. A fuel supply system for an internal combustion engine comprising a remote fuel tank, a first crankcase operated fuel pump including a fuel pumping chamber having a fuel inlet communicating with said fuel tank and a fuel outlet, a vapor separator including a fuel inlet communicating with said outlet of said first fuel pump, a fuel vapor outlet, a liquid fuel outlet, and a return fuel inlet, a second crankcase operated fuel pump including a fuel inlet communicating with said outlet of said vapor separator, and a fuel outlet, and a fuel injector including a nozzle adapted to communicate with a combustion chamber, a fuel inlet communicating with said fuel outlet of said second fuel pump, and a return outlet communicating with said return fuel inlet of said vapor separator.
2. A fuel supply system in accordance with Claim 1 wherein said first and second fuel pumps respectively include diaphragms which are connected by a link for common movement.
3. A fuel supply system in accordance with Claim 1 and further including a plurality of said fuel injectors.
4. A fuel supply system for an internal combustion engine comprising a remote fuel tank, a first crankcase operated fuel pump including a diaphragm defining a pressure chamber adapted to be connected to a source of pulsating pressure and a fuel pumping chamber having a fuel inlet communicating with said fuel tank, and a fuel outlet, a vapor separator including a fuel inlet communicating with said outlet of said first fuel pump, a fuel vapor outlet, a liquid fuel outlet, and a return fuel inlet, a second crankcase operated fuel pump including a diaphragm defining a pressure chamber adapted to be connected to a source of pulsating pressure and a fuel pumping chamber including a fuel inlet communicating with said outlet of said vapor separator, and a fuel outlet, a link connecting said diaphragms for common movement, and a fuel injector including a nozzle adapted to communicate with a combustion chamber, a fuel inlet communicating with said fuel outlet of said second fuel pump, and a return outlet communicating with said return fuel inlet of said vapor separator.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US27652794A | 1994-07-18 | 1994-07-18 | |
| US08/276,527 | 1994-07-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2150324A1 true CA2150324A1 (en) | 1996-01-19 |
Family
ID=23056991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002150324A Abandoned CA2150324A1 (en) | 1994-07-18 | 1995-05-26 | Fuel system for fuel injected two stroke engine |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPH0861177A (en) |
| AU (1) | AU2014895A (en) |
| BE (1) | BE1008541A6 (en) |
| CA (1) | CA2150324A1 (en) |
| DE (1) | DE19525096A1 (en) |
| FR (1) | FR2722542A1 (en) |
| GB (1) | GB2291470A (en) |
| IT (1) | ITRM950492A1 (en) |
| SE (1) | SE9502591L (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AUPN391595A0 (en) * | 1995-06-30 | 1995-07-27 | Orbital Engine Company (Australia) Proprietary Limited | Improvements to fuel pumps |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD130166B1 (en) * | 1977-03-07 | 1980-03-19 | Hans Berg | FUEL SYSTEM FOR AIR COMPRESSED INTERNAL COMBUSTION ENGINES! |
| US4539949A (en) * | 1981-10-08 | 1985-09-10 | Outboard Marine Corporation | Combined fluid pressure actuated fuel and oil pump |
| GB8309426D0 (en) * | 1983-04-07 | 1983-05-11 | Flotronics Ag | Pumps |
| US4589381A (en) * | 1983-09-28 | 1986-05-20 | Hitachi, Ltd. | Intake system for internal combustion engine |
| JPS61198572U (en) * | 1985-05-31 | 1986-12-11 | ||
| US4856483A (en) * | 1988-01-04 | 1989-08-15 | Brunswick Corporation | Vacuum bleed and flow restrictor fitting for fuel injected engines with vapor separator |
| US4794888A (en) * | 1988-01-04 | 1989-01-03 | Brunswick Corporation | Fuel puddle suction system for fuel injected engine |
| US4844043A (en) * | 1988-02-22 | 1989-07-04 | Brunswick Corporation | Anti vapor lock carbureted fuel system |
| GB2217388B (en) * | 1988-04-11 | 1992-11-18 | Outboard Marine Corp | Vapour separator |
-
1995
- 1995-05-19 AU AU20148/95A patent/AU2014895A/en not_active Abandoned
- 1995-05-24 GB GB9510492A patent/GB2291470A/en not_active Withdrawn
- 1995-05-26 CA CA002150324A patent/CA2150324A1/en not_active Abandoned
- 1995-07-10 DE DE19525096A patent/DE19525096A1/en not_active Withdrawn
- 1995-07-11 FR FR9508379A patent/FR2722542A1/en active Pending
- 1995-07-12 BE BE9500621A patent/BE1008541A6/en not_active IP Right Cessation
- 1995-07-13 SE SE9502591A patent/SE9502591L/en not_active Application Discontinuation
- 1995-07-13 JP JP7177004A patent/JPH0861177A/en active Pending
- 1995-07-18 IT IT95RM000492A patent/ITRM950492A1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| AU2014895A (en) | 1996-02-01 |
| SE9502591D0 (en) | 1995-07-13 |
| GB2291470A (en) | 1996-01-24 |
| JPH0861177A (en) | 1996-03-05 |
| GB9510492D0 (en) | 1995-07-19 |
| FR2722542A1 (en) | 1996-01-19 |
| BE1008541A6 (en) | 1996-06-04 |
| DE19525096A1 (en) | 1996-01-25 |
| ITRM950492A1 (en) | 1996-01-18 |
| SE9502591L (en) | 1996-01-19 |
| ITRM950492A0 (en) | 1995-07-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |