CN211448868U - Common rail fuel injection system for diesel engine - Google Patents
Common rail fuel injection system for diesel engine Download PDFInfo
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- CN211448868U CN211448868U CN201922491440.2U CN201922491440U CN211448868U CN 211448868 U CN211448868 U CN 211448868U CN 201922491440 U CN201922491440 U CN 201922491440U CN 211448868 U CN211448868 U CN 211448868U
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Abstract
The utility model discloses a common rail fuel injection system for diesel engine. The system mainly comprises a controller, two high-pressure oil pumps, two common rail pipes, a two-position three-way electromagnetic valve and an electric control oil injector. The controller realizes two independent pressure-adjustable fuel pressure sources through two independent common rail pipe fuel pressure closed-loop control systems. The controller realizes the control of the oil injection pressure in the single oil injection process through a two-position three-way electromagnetic valve. By reasonably matching the power-on starting point and the power-on ending point of the two-position three-way electromagnetic valve and the power-on starting point and the power-on ending point of the electric control fuel injector, the continuous flexible variable fuel injection rate beneficial to the combustion of the engine can be realized.
Description
Technical Field
The utility model belongs to the technical field of diesel engine fuel injection system. And more particularly to a common rail fuel injection system for a diesel engine.
Background
At present, in order to cope with increasingly strict engine emission regulations, it is an important solution for diesel engines to adopt common rail fuel injection systems. The conventional common rail fuel injection system mainly comprises a fuel delivery pump, a high-pressure fuel pump, a common rail pipe, an electric control fuel injector, a controller, a rail pressure sensor and a wire harness. The fuel oil is conveyed to the high-pressure oil pump from the oil tank by the fuel oil delivery pump, the high-pressure oil pump driven by the engine boosts the pressure of the fuel oil and sends the fuel oil into the common rail pipe, the controller performs closed-loop control on the pressure of the fuel oil in the common rail pipe according to a fuel oil pressure signal acquired by the rail pressure sensor, and the controller drives the electronic control oil injector to inject oil according to MAP calibrated by the engine. The timing of oil injection is determined by the power-on starting point of the electronic control oil injector, the pressure of oil injection is determined by the pressure of fuel oil in the common rail pipe, the duration of oil injection is determined by the power-on duration of the electronic control oil injector, and single oil injection generally has an approximately rectangular oil injection rule. However, the approximately rectangular injection law makes it difficult for the diesel engine to meet the increasingly strict emission regulations.
Disclosure of Invention
The utility model aims to provide a common rail fuel injection system for diesel engine. Multiple changes in injection pressure and injection rate can be achieved over the duration of a single injection of the diesel engine. Through reasonable control, the continuous flexible variable injection rate beneficial to the combustion of the diesel engine can be obtained.
The utility model discloses the technical problem that will solve can realize through following technical scheme:
a common rail fuel injection system for a diesel engine comprises two high-pressure oil pumps, two pressure limiting valves, two common rail pipes and an electric control fuel injector, wherein the two pressure limiting valves are respectively used for connecting a pressure limiting oil port of one high-pressure oil pump with a fuel tank through a pipeline; the fuel inlets of the two high-pressure oil pumps are connected with the fuel tank through pipelines, the fuel inlets of the two high-pressure oil pumps are respectively connected with the fuel inlet of a common rail pipe through pipelines, and two common rail pipes are respectively provided with a rail pressure sensor; the fuel oil control system is characterized by further comprising a two-position three-way electromagnetic valve and a controller, wherein fuel oil outlets of the two common rail pipes are connected with two fuel oil inlets on the two-position three-way electromagnetic valve through pipelines, and the fuel oil inlets on the two-position three-way electromagnetic valve are connected with the fuel oil inlet of the electric control fuel injector through a pipeline; the controller is in signal connection with the rail pressure sensors on the two common rail pipes, and the controller is in control connection with the two high-pressure oil pumps and the electric control oil injector.
The utility model discloses use a controller, through two sets of independent PID closed-loop control systems, realize two independent pressure adjustable high pressure fuel pressure source. A two-position three-way electromagnetic valve is arranged in the system, and the controller can realize the control of the oil injection pressure in the single oil injection process through the two-position three-way electromagnetic valve.
The utility model has the advantages as follows:
the conventional common rail fuel injection system can only realize an approximately rectangular fuel injection rule, but the approximately rectangular fuel injection rule is difficult to meet the requirements of the diesel engine on oil consumption and emission under all working conditions. The utility model provides a common rail fuel injection system can provide more nimble oil spout law, through reasonable control, can realize more being favorable to multiple oil spout laws such as the boots type, trapezoidal of diesel engine burning.
The system has simple structure. Only one two-position three-way electromagnetic valve, one common rail pipe and one high-pressure oil pump are added to a conventional common rail fuel injection system. The system can be realized.
Based on the above-mentioned situation. The utility model provides a common rail fuel injection system and control method thereof can realize more nimble oil spout law. Through reasonable control, various oil injection rules such as boot type, trapezoid and the like which are more favorable for combustion of the diesel engine can be realized. Provides a new solution for diesel engines to meet increasingly strict emission regulations.
Drawings
Fig. 1 is a schematic structural diagram of a common rail fuel injection system for a diesel engine according to the present invention.
Fig. 2 and fig. 3 are curves of the electric control fuel injector driving current, the two-position three-way electromagnetic valve driving current, the injection pressure and the fuel injection rate of the diesel engine changing with time within the single fuel injection duration.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand and understand, the present invention is further explained by combining the drawings.
Referring to fig. 1, a fuel inlet of a high-pressure oil pump I8 and a fuel inlet of a high-pressure oil pump II are connected with a fuel tank 13 through pipelines, a pressure limiting oil port of the high-pressure oil pump I8 and a pressure limiting oil port of the high-pressure oil pump II are respectively connected with a pressure limiting valve I11 and a pressure limiting valve II 12 through pipelines, and the pressure limiting valve I11 and the pressure limiting valve II 12 are connected with the fuel tank 13 through pipelines.
Fuel oil enters a common rail pipe I6 and a common rail pipe II 7 from a fuel tank 13 through a high-pressure oil pump I8 and a high-pressure oil pump II 9 respectively, a rail pressure sensor I4 and a rail pressure sensor II 5 are connected with the common rail pipe I6 and the common rail pipe II 7 respectively, and a controller 3 is connected with the high-pressure oil pump I8, the high-pressure oil pump II 9, the rail pressure sensor I4 and the rail pressure sensor II 5 respectively through a wiring harness 10. The controller 3 respectively collects fuel pressure in the common rail pipe I6 and the common rail pipe II 7 through the rail pressure sensor I4 and the rail pressure sensor II 5, and respectively controls the oil pumping quantity of the high-pressure oil pump I8 and the high-pressure oil pump II 9 in a PID closed-loop control mode according to the calibrated control MAP of the diesel engine so as to realize accurate control of the fuel pressure in the common rail pipe I6 and the common rail pipe II 7. When the system operation breaks down to cause the fuel pressure in the common rail pipe I6 and the common rail pipe II 7 to be abnormally increased, the fuel pressure and the pressure are respectively drained and reduced through the pressure limiting valve I11 and the pressure limiting valve II 12, and the safety of the diesel engine is maintained.
Referring to fig. 1, a fuel outlet of a common rail pipe i 6 and a fuel outlet of a common rail pipe ii 7 are connected with two fuel outlets of a two-position three-way electromagnetic valve 2 through pipelines, the fuel outlet of the two-position three-way electromagnetic valve 2 is connected with an electric control fuel injector 1 through management, and a controller 3 is connected with the two-position three-way electromagnetic valve 2 and the electric control fuel injector 1 through a wiring harness 10. And the controller 3 outputs driving current to the two-position three-way electromagnetic valve 2 and the electric control oil injector 1 according to the control MAP calibrated by the diesel engine. The two-position three-way electromagnetic valve 2 realizes the conversion of fuel injection pressure under the action of driving current, and the electric control fuel injector 1 injects fuel into a cylinder of the diesel engine according to the preset fuel injection timing and fuel injection rule under the action of the driving current.
The utility model discloses a common rail fuel injection system can realize changing many times of oil injection pressure and oil spout speed in diesel engine single oil spout duration. By reasonable control, various forms of oil injection rules can be obtained.
Referring to fig. 2, a curve 1 is a driving current variation curve of the electronic fuel injector 1, and a curve 2 is a driving current variation curve of the two-position three-way solenoid valve 2. Both curve 1 and curve 2 are operated by the controller 3 according to the control MAP calibrated for the diesel engine. Curve 3 is the fuel injection pressure profile of the system and curve 4 is the injection rate profile of the system. The system can realize the following functions through reasonable control:
during the duration of the driving current of the electronic control fuel injector 1 (time period from t1 to t 2), when the two-position three-way solenoid valve 2 is energized, the fuel injection pressure is changed from pressure P1 (fuel pressure in the common rail pipe i) to injection pressure P2 (fuel pressure in the common rail pipe ii). The starting point t5 of the injection pressure change (from P1 to P2) can be changed by changing the energization starting point t3 of the two-position three-way electromagnetic valve 2; the start point t6 of the injection pressure change (from P2 to P1) can be changed by changing the energization end point t4 of the two-position three-way solenoid valve 2. The control method realizes the change of the injection pressure in the single injection duration of the diesel engine.
② the duration of the electric fuel injector 1 driving current (period t 1-t 2). The starting point of the oil injection rate G1 can be changed by changing the power-on starting point t1 of the electric control oil injector 1; the starting point t8 of the oil injection rate G2 can be changed by changing the energization starting point t3 of the two-position three-way electromagnetic valve 2; the starting point t9 of the change of the oil injection speed from G2 to G1 can be changed by changing the power-off starting point t4 of the two-position three-way electromagnetic valve 2; the end time t10 of the fuel injection duration can be changed by changing the power-off starting point t2 of the driving current of the electronic control fuel injector 1. The control method realizes the change of the fuel injection rule within the single fuel injection duration of the diesel engine.
Implementation example:
referring to fig. 3, when the fuel pressure value P2 in the common rail pipe ii 9 is greater than the fuel pressure value P1 in the common rail pipe i 8 (P2 is about 50 to 100MPa compared to P1), and the power failure starting point t4 of the two-position three-way electromagnetic valve 2 is slightly later than the power failure starting point t2 of the electronic fuel injector 1 (about 150 microseconds later), the boot-type fuel injection law (see curve 8 in fig. 3) favorable for combustion of the diesel engine can be realized.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. A common rail fuel injection system for a diesel engine comprises two high-pressure oil pumps, two pressure limiting valves, two common rail pipes and an electric control fuel injector, wherein the two pressure limiting valves are respectively used for connecting a pressure limiting oil port of one high-pressure oil pump with a fuel tank through a pipeline; the fuel inlets of the two high-pressure oil pumps are connected with the fuel tank through pipelines, the fuel inlets of the two high-pressure oil pumps are respectively connected with the fuel inlet of a common rail pipe through pipelines, and two common rail pipes are respectively provided with a rail pressure sensor; the fuel oil control system is characterized by further comprising a two-position three-way electromagnetic valve and a controller, wherein fuel oil outlets of the two common rail pipes are connected with two fuel oil inlets on the two-position three-way electromagnetic valve through pipelines, and the fuel oil inlets on the two-position three-way electromagnetic valve are connected with the fuel oil inlet of the electric control fuel injector through a pipeline; the controller is in signal connection with the rail pressure sensors on the two common rail pipes, and the controller is in control connection with the two high-pressure oil pumps and the electric control oil injector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922491440.2U CN211448868U (en) | 2019-12-31 | 2019-12-31 | Common rail fuel injection system for diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922491440.2U CN211448868U (en) | 2019-12-31 | 2019-12-31 | Common rail fuel injection system for diesel engine |
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| CN211448868U true CN211448868U (en) | 2020-09-08 |
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| CN201922491440.2U Active CN211448868U (en) | 2019-12-31 | 2019-12-31 | Common rail fuel injection system for diesel engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111022232A (en) * | 2019-12-31 | 2020-04-17 | 南岳电控（衡阳）工业技术股份有限公司 | Common rail fuel injection system for diesel engine and control method thereof |
| CN113123890A (en) * | 2021-05-07 | 2021-07-16 | 华中科技大学 | double-ECU high-pressure common rail fuel control system and method for highly-intensified diesel engine |
-
2019
- 2019-12-31 CN CN201922491440.2U patent/CN211448868U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111022232A (en) * | 2019-12-31 | 2020-04-17 | 南岳电控（衡阳）工业技术股份有限公司 | Common rail fuel injection system for diesel engine and control method thereof |
| CN113123890A (en) * | 2021-05-07 | 2021-07-16 | 华中科技大学 | double-ECU high-pressure common rail fuel control system and method for highly-intensified diesel engine |
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