CN114704403A - Engine fuel system - Google Patents
Engine fuel system Download PDFInfo
- Publication number
- CN114704403A CN114704403A CN202210406894.9A CN202210406894A CN114704403A CN 114704403 A CN114704403 A CN 114704403A CN 202210406894 A CN202210406894 A CN 202210406894A CN 114704403 A CN114704403 A CN 114704403A
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- Prior art keywords
- oil
- pressure
- low
- oil outlet
- pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/3005—Details not otherwise provided for
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- 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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
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- 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
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/02—Pumps peculiar thereto
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses an engine fuel system, which comprises a monoblock pump, a common rail pipe, an oil path conversion unit, an electric control oil injector and an electronic control unit, wherein the monoblock pump is connected with the common rail pipe through a pipeline; a high-pressure plunger assembly and a low-pressure plunger assembly are arranged in a pump body of the monoblock pump, the high-pressure plunger assembly is used for supplying oil to a high-pressure oil outlet, and the low-pressure plunger assembly is used for supplying oil to a low-pressure oil outlet; an oil inlet of the common rail pipe is communicated with the high-pressure oil outlet; an oil inlet of the electric control oil injector is respectively communicated with an oil outlet and a low-pressure oil outlet of the common rail pipe through an oil way conversion unit; the electronic control unit is in signal connection with the oil path conversion unit and the electric control oil injector, and the electronic control unit is used for controlling the state of the oil path conversion unit and the opening and closing state of the electric control oil injector. The system can realize independent control of oil supply and oil injection under the low-speed working condition of the engine, solves the problem of influence caused by poor in-cylinder combustion due to poor atomization effect of the electric control oil injector under the low-speed state, and can realize flexible control of an oil injection rule and an oil injection strategy of delaying first and then accelerating second.
Description
Technical Field
The invention relates to the technical field of engines, in particular to an engine fuel system.
Background
The unit pump fuel system generally adopts a cylinder-pump mode to supply oil, and the fuel injection pressure of the unit pump fuel system is related to the rotating speed of the diesel engine, so that the unit pump system cannot realize higher injection pressure under the low-speed working condition of the diesel engine, and the phenomena of poor atomization effect and poor combustion exist. Meanwhile, the single pump system cannot realize flexible control of the oil injection rule and an oil injection strategy of firstly slowing and then quickly.
Disclosure of Invention
The invention provides an engine fuel system which can realize independent control of fuel supply and fuel injection under the low-speed working condition of an engine, solve the problem of influence caused by poor in-cylinder combustion due to poor atomization effect of an electric control fuel injector under the low-speed state, and achieve the purposes of realizing flexible control of a fuel injection rule and a strategy of fuel injection from slow to fast.
In order to achieve the purpose, the invention provides the following technical scheme:
an engine fuel system comprises a monoblock pump, a common rail pipe, an oil path conversion unit, an electric control fuel injector and an electronic control unit;
the pump body of the monoblock pump is provided with a high-pressure oil outlet and a low-pressure oil outlet, a high-pressure plunger assembly and a low-pressure plunger assembly are arranged inside the pump body of the monoblock pump, the high-pressure plunger assembly is used for supplying oil to the high-pressure oil outlet, the low-pressure plunger assembly is used for supplying oil to the low-pressure oil outlet, and the oil pressure of the fuel oil at the high-pressure oil outlet is greater than that of the fuel oil at the low-pressure oil outlet;
an oil inlet of the common rail pipe is communicated with a high-pressure oil outlet of the unit pump;
an oil inlet of the electric control oil injector is respectively communicated with an oil outlet of the common rail pipe and a low-pressure oil outlet of the monoblock pump through the oil way conversion unit;
the electronic control unit is in signal connection with the oil path conversion unit and the electric control oil sprayer, and is used for controlling the state of the oil path conversion unit, switching the communication between the oil inlet of the electric control oil sprayer and the oil outlet of the common rail pipe or the low-pressure oil outlet of the monoblock pump, and controlling the opening and closing state of the electric control oil sprayer.
In the engine fuel system provided by the embodiment of the invention, the pump body of the monoblock pump is internally provided with the high-pressure plunger assembly and the low-pressure plunger assembly, namely, the monoblock pump is set to be a double-plunger monoblock pump, wherein the high-pressure plunger assembly is used for supplying high-pressure oil to the high-pressure oil outlet of the monoblock pump, the low-pressure plunger assembly is used for supplying low-pressure oil to the low-pressure oil outlet of the monoblock pump, the high-pressure oil port of the monoblock pump is communicated with the oil inlet of the common rail pipe, the oil outlet of the common rail pipe and the low-pressure oil outlet of the monoblock pump are communicated with the oil inlet of the electric control oil injector through the oil path conversion unit, and the electronic control unit is in signal connection with the oil path conversion unit and the electric control oil injector. The monoblock pump in the engine fuel system is a double-plunger monoblock pump, independent control of oil supply and oil injection can be achieved under the low-speed working condition of the engine through the double plungers, the influence caused by poor atomization effect of the electric control oil injector in a low-speed state and poor in-cylinder combustion is avoided, and the state of the oil way conversion unit and the opening and closing state of the electric control oil injector are controlled through the electronic control unit according to a preset instruction, so that the purposes of achieving flexible control of an oil injection rule and an oil injection strategy of firstly slow and then fast are achieved.
Optionally, the oil path conversion unit is a conversion electromagnetic valve, a first oil inlet of the conversion electromagnetic valve is communicated with an oil outlet of the common rail pipe, a second oil inlet of the conversion electromagnetic valve is communicated with a low-pressure oil outlet of the monoblock pump, and an oil outlet of the conversion electromagnetic valve is communicated with an oil inlet of the electronic control oil injector;
the switching solenoid valve has a first state and a second state;
when the switching electromagnetic valve is in a first state, a first oil inlet of the switching electromagnetic valve is communicated with an oil outlet of the switching electromagnetic valve, and a second oil inlet of the switching electromagnetic valve is not communicated with the oil outlet of the switching electromagnetic valve;
when the switching electromagnetic valve is in a second state, a second oil inlet of the switching electromagnetic valve is communicated with an oil outlet of the switching electromagnetic valve, and a first oil inlet of the switching electromagnetic valve is not communicated with the oil outlet of the switching electromagnetic valve.
Optionally, the single pump further comprises a first camshaft for driving the high pressure plunger assembly and a second camshaft for driving the low pressure plunger assembly.
Optionally, the high-pressure plunger assembly comprises a high-pressure plunger and a first plunger sleeve, and the first cam shaft can drive the high-pressure plunger to reciprocate in the first plunger sleeve so as to change the fuel pressure inside the unit pump.
Optionally, the low pressure plunger assembly comprises a low pressure plunger and a second plunger sleeve, and the second camshaft can drive the low pressure plunger to reciprocate in the second plunger sleeve so as to change the fuel pressure in the single pump.
The invention also provides an engine which comprises any one of the engine fuel systems provided in the technical scheme.
Optionally, the engine is a diesel engine.
Drawings
FIG. 1 is a schematic structural diagram of an engine fuel system according to an embodiment of the present invention.
Icon:
1-a monomer pump; 11-a high pressure plunger assembly; 12-a low pressure plunger assembly; 13-a first camshaft; 14-a second camshaft; 2-common rail pipe; 3-an oil path conversion unit; 3-switching the electromagnetic valve; 4-an electronic control oil injector; 5-an electronic control unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides an engine fuel system, including a monoblock pump 1, a common rail pipe 2, an oil path conversion unit 3, an electronic control fuel injector 4, and an electronic control unit 5;
the pump body of the unit pump 1 is provided with a high-pressure oil outlet and a low-pressure oil outlet, a high-pressure plunger assembly 11 and a low-pressure plunger assembly 12 are arranged inside the pump body of the unit pump 1, the high-pressure plunger assembly 11 is used for supplying oil to the high-pressure oil outlet, the low-pressure plunger assembly 12 is used for supplying oil to the low-pressure oil outlet, and the oil pressure of the fuel oil at the high-pressure oil outlet is greater than that of the fuel oil at the low-pressure oil outlet;
an oil inlet of the common rail pipe 2 is communicated with a high-pressure oil outlet of the unit pump 1;
an oil inlet of the electric control oil injector 4 is respectively communicated with an oil outlet of the common rail pipe 2 and a low-pressure oil outlet of the unit pump 1 through an oil way conversion unit 3;
the electronic control unit 5(ECU) is in signal connection with the oil path conversion unit 3 and the electric control oil injector 4, and the electronic control unit 5 is used for controlling the state of the oil path conversion unit 3, switching the communication of an oil inlet of the electric control oil injector 4 with an oil outlet of the common rail pipe 2 or a low-pressure oil outlet of the unit pump 1, and controlling the opening and closing state of the electric control oil injector 4.
In the engine fuel system provided by the embodiment of the invention, a high-pressure plunger assembly 11 and a low-pressure plunger assembly 12 are arranged inside a pump body of a single pump 1, namely, the single pump 1 is set to be a double-plunger single pump, wherein the high-pressure plunger assembly 11 supplies high-pressure oil to a high-pressure oil outlet of the single pump 1, the low-pressure plunger assembly 12 supplies low-pressure oil to a low-pressure oil outlet of the single pump 1, a high-pressure oil port of the single pump 1 is communicated with an oil inlet of a common rail pipe 2, an oil outlet of the common rail pipe 2 and a low-pressure oil outlet of the single pump 1 are communicated with an oil inlet of an electric control oil injector 4 through an oil path conversion unit 3, and an electronic control unit 5 is in signal connection with the oil path conversion unit 3 and the electric control oil injector 4. The monoblock pump 1 in the engine fuel system is a double-plunger monoblock pump, independent control of oil supply and oil injection can be achieved under the low-speed working condition of the engine through the double plungers, the influence caused by poor atomization effect of the electric control oil injector 4 in a cylinder is avoided, the electronic control unit 5 controls the state of the oil way conversion unit 3 and the opening and closing state of the electric control oil injector 4 according to a preset instruction, and therefore the purposes of achieving flexible control of an oil injection rule and an oil injection strategy of firstly delaying and then rapidly are achieved.
Specifically, in the engine fuel system, the oil outlet time of the high-pressure plunger assembly 11 and the low-pressure plunger assembly 12 can be controlled according to calibrated parameters. In the process of pressurizing the fuel in the monoblock pump 1, the electronic control unit 5 can control the state of the fuel path conversion unit 3 to enable the low-pressure fuel outlet of the monoblock pump 1 to supply fuel for the electric control fuel injector 4, and then a needle valve in the electric control fuel injector 4 can be opened slowly to inject fuel slowly under the control of a preset instruction of the electronic control unit 5. Then, the electronic control unit 5 can control the oil path switching unit 3 to switch states, so that an oil outlet of the common rail pipe 2 is communicated with an oil inlet of the electronic control oil injector 4, the common rail pipe 2 provides high-pressure fuel oil for the electronic control oil injector 4, and then a needle valve in the electronic control oil injector 4 can be opened rapidly under the control of a preset instruction of the electronic control unit 5, so that fast spraying is achieved. Therefore, the fuel injection strategy of the engine fuel system can be realized after the fuel injection strategy is slow and quick.
Specifically, the monoblock pump 1 has the advantages of high oil supply pressure, simple structure and high reliability, and flexible matching with engines in different power ranges can be easily realized, so that the fault rate can be reduced.
In the embodiment of the invention, the oil path switching unit 3 may be a switching solenoid valve 31, wherein a first oil inlet of the switching solenoid valve 31 is communicated with an oil outlet of the common rail pipe 2, a second oil inlet of the switching solenoid valve 31 is communicated with a low-pressure oil outlet of the unit pump 1, and an oil outlet of the switching solenoid valve 31 is communicated with an oil inlet of the electrically controlled oil injector 4; the switching solenoid valve 31 may have a first state and a second state; when the switching solenoid valve 31 is in the first state, a first oil inlet of the switching solenoid valve 31 is communicated with an oil outlet of the switching solenoid valve 31, and a second oil inlet of the switching solenoid valve 31 is not communicated with the oil outlet of the switching solenoid valve 31; when the switching solenoid valve 31 is in the second state, the second oil inlet of the switching solenoid valve 31 is communicated with the oil outlet of the switching solenoid valve 31, and the first oil inlet of the switching solenoid valve 31 is not communicated with the oil outlet of the switching solenoid valve 31. The electronic control unit 5 controls the switching of the first state and the second state of the switching electromagnetic valve 31, so that the communication switching between the oil outlet of the common rail pipe 2 and the low-pressure oil outlet of the unit pump 1 and the oil inlet of the electric control oil injector 4 can be realized. As shown in fig. 1, the electronic control unit 5 controls the right valve of the switching electromagnetic valve 31 to open and the left valve to close, the low-pressure fuel injection port of the monoblock pump 1 can supply fuel to the electronic control fuel injector 4 through the switching electromagnetic valve 31, the right valve of the switching electromagnetic valve 31 is closed, the left valve is opened, the high-pressure fuel in the common rail pipe 2 can supply fuel to the electronic control fuel injector 4 through the switching electromagnetic valve 31, the high-pressure fuel and the low-pressure fuel are switched to enter the electronic control fuel injector 4 through the switching electromagnetic valve 31, and flexible control of the fuel injection rule can be achieved.
In the above embodiment of the invention, the unit pump 1 further includes the first camshaft 13 and the second camshaft 14, the first camshaft 13 is used for driving the high-pressure plunger assembly 11 to realize pressurization of the fuel inside the unit pump 1, and the second camshaft 14 is used for driving the low-pressure plunger assembly 12 to realize pressurization of the fuel inside the unit pump 1.
Specifically, the high-pressure plunger assembly 11 includes a high-pressure plunger and a first plunger sleeve, and the first camshaft 13 may drive the high-pressure plunger to reciprocate in the first plunger sleeve, so as to change the fuel pressure inside the unit pump 1.
Specifically, the low-pressure plunger assembly 12 includes a low-pressure plunger and a second plunger sleeve in which the second camshaft 14 can drive the low-pressure plunger to reciprocate, so that the fuel pressure inside the unit pump 1 varies.
The embodiment of the invention also provides an engine which comprises any one of the engine fuel systems provided in the technical scheme.
Specifically, the engine is a diesel engine.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. An engine fuel system is characterized by comprising a monoblock pump, a common rail pipe, an oil path conversion unit, an electric control oil injector and an electronic control unit;
the pump body of the monoblock pump is provided with a high-pressure oil outlet and a low-pressure oil outlet, a high-pressure plunger assembly and a low-pressure plunger assembly are arranged inside the pump body of the monoblock pump, the high-pressure plunger assembly is used for supplying oil to the high-pressure oil outlet, the low-pressure plunger assembly is used for supplying oil to the low-pressure oil outlet, and the oil pressure of the fuel oil at the high-pressure oil outlet is greater than that of the fuel oil at the low-pressure oil outlet;
an oil inlet of the common rail pipe is communicated with a high-pressure oil outlet of the unit pump;
an oil inlet of the electric control oil injector is respectively communicated with an oil outlet of the common rail pipe and a low-pressure oil outlet of the monoblock pump through the oil way conversion unit;
the electronic control unit is in signal connection with the oil path conversion unit and the electric control oil sprayer, and is used for controlling the state of the oil path conversion unit, switching the communication between the oil inlet of the electric control oil sprayer and the oil outlet of the common rail pipe or the low-pressure oil outlet of the monoblock pump, and controlling the opening and closing state of the electric control oil sprayer.
2. The engine fuel system according to claim 1, wherein the oil path conversion unit is a conversion solenoid valve, a first oil inlet of the conversion solenoid valve is communicated with an oil outlet of the common rail pipe, a second oil inlet of the conversion solenoid valve is communicated with a low-pressure oil outlet of the unit pump, and an oil outlet of the conversion solenoid valve is communicated with an oil inlet of the electronic control oil injector;
the switching solenoid valve has a first state and a second state;
when the switching electromagnetic valve is in a first state, a first oil inlet of the switching electromagnetic valve is communicated with an oil outlet of the switching electromagnetic valve, and a second oil inlet of the switching electromagnetic valve is not communicated with the oil outlet of the switching electromagnetic valve;
when the switching electromagnetic valve is in a second state, a second oil inlet of the switching electromagnetic valve is communicated with an oil outlet of the switching electromagnetic valve, and a first oil inlet of the switching electromagnetic valve is not communicated with the oil outlet of the switching electromagnetic valve.
3. The engine fuel system of claim 1 or 2, wherein the monoblock pump further comprises a first camshaft for driving the high pressure plunger assembly and a second camshaft for driving the low pressure plunger assembly.
4. The engine fuel system of claim 3, wherein the high pressure plunger assembly includes a high pressure plunger and a first plunger sleeve, and the first camshaft is adapted to drive the high pressure plunger to reciprocate within the first plunger sleeve to vary the fuel pressure within the monoblock pump.
5. The engine fuel system of claim 3, wherein the low pressure plunger assembly includes a low pressure plunger and a second plunger sleeve within which the second camshaft may drive the low pressure plunger to reciprocate to vary fuel pressure within the monoblock pump.
6. An engine comprising an engine fuel system as claimed in any one of claims 1 to 5.
7. The engine of claim 6, wherein the engine is a diesel engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210406894.9A CN114704403B (en) | 2022-04-18 | 2022-04-18 | Engine fuel system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210406894.9A CN114704403B (en) | 2022-04-18 | 2022-04-18 | Engine fuel system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114704403A true CN114704403A (en) | 2022-07-05 |
| CN114704403B CN114704403B (en) | 2023-03-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210406894.9A Active CN114704403B (en) | 2022-04-18 | 2022-04-18 | Engine fuel system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114704403B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114992021A (en) * | 2022-06-15 | 2022-09-02 | 一汽解放汽车有限公司 | Variable injector of injection rate and engine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10154133C1 (en) * | 2001-11-03 | 2003-02-13 | Bosch Gmbh Robert | Common-rail fuel system for IC engine has fuel fed from between fuel metering device and high pressure fuel pump fed to low pressure region with pressure reduction device |
| CN1811159A (en) * | 2006-01-27 | 2006-08-02 | 大连理工大学 | Double-plunger oil supplying pump |
| CN101000025A (en) * | 2006-12-26 | 2007-07-18 | 大连理工大学 | Plunger even member adopting shoe-shape oil supplying law |
| CN105464863A (en) * | 2015-12-09 | 2016-04-06 | 中国船舶重工集团公司第七一一研究所 | Electronic unit pump system and oil spray control method |
| CN108138736A (en) * | 2015-10-07 | 2018-06-08 | 大陆汽车有限公司 | The high pressure fuel pump and fuel supply device of internal combustion engine for internal combustion engine, particularly for motor vehicles |
| CN210919302U (en) * | 2019-10-21 | 2020-07-03 | 德尔福（上海）动力推进系统有限公司 | High-pressure fuel pump structure adapted to gasoline engine with double fuel injection systems |
-
2022
- 2022-04-18 CN CN202210406894.9A patent/CN114704403B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10154133C1 (en) * | 2001-11-03 | 2003-02-13 | Bosch Gmbh Robert | Common-rail fuel system for IC engine has fuel fed from between fuel metering device and high pressure fuel pump fed to low pressure region with pressure reduction device |
| CN1811159A (en) * | 2006-01-27 | 2006-08-02 | 大连理工大学 | Double-plunger oil supplying pump |
| CN101000025A (en) * | 2006-12-26 | 2007-07-18 | 大连理工大学 | Plunger even member adopting shoe-shape oil supplying law |
| CN108138736A (en) * | 2015-10-07 | 2018-06-08 | 大陆汽车有限公司 | The high pressure fuel pump and fuel supply device of internal combustion engine for internal combustion engine, particularly for motor vehicles |
| CN105464863A (en) * | 2015-12-09 | 2016-04-06 | 中国船舶重工集团公司第七一一研究所 | Electronic unit pump system and oil spray control method |
| CN210919302U (en) * | 2019-10-21 | 2020-07-03 | 德尔福（上海）动力推进系统有限公司 | High-pressure fuel pump structure adapted to gasoline engine with double fuel injection systems |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114992021A (en) * | 2022-06-15 | 2022-09-02 | 一汽解放汽车有限公司 | Variable injector of injection rate and engine |
| CN114992021B (en) * | 2022-06-15 | 2023-12-29 | 一汽解放汽车有限公司 | Injector with variable oil injection rate and engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114704403B (en) | 2023-03-21 |
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