CN207777005U - A kind of diesel injection system - Google Patents
A kind of diesel injection system Download PDFInfo
- Publication number
- CN207777005U CN207777005U CN201820032100.6U CN201820032100U CN207777005U CN 207777005 U CN207777005 U CN 207777005U CN 201820032100 U CN201820032100 U CN 201820032100U CN 207777005 U CN207777005 U CN 207777005U
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- pump
- fuel injector
- check valve
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Abstract
The utility model provides a kind of diesel injection system, including：Mechanical pump, check valve, electric-controlled fuel injector, controller, compression pump and fuel tank, described compression pump one end is connect with the fuel tank, the other end is connect with the import of the mechanical pump, the outlet of the mechanical pump is connect by pipeline with one end of the import of the electric-controlled fuel injector and the check valve respectively, the other end of the check valve is connect by pipeline with the fuel tank, the outlet of the electric-controlled fuel injector is connect by pipeline with the fuel tank, the controller is connect with the electric-controlled fuel injector, and the opening and closing of the electric-controlled fuel injector are controlled according to preset control table.The diesel injection system that the utility model embodiment provides can improve mechanical pumping system fuel-injection pressure and injection timing flexible variable, meet engine emission and fuel economy demand in low engine speeds.
Description
Technical field
It is the utility model is related to a kind of diesel injection system, more particularly to a kind of with mechanical pump pressure-accumulating type electronic control fuel injection device
Diesel injection system.
Background technology
Traditional mechanical pump type fuel injection system is made of mechanical pump, high-pressure oil pipe and hydraulic injection device；In mechanical pump
Plunger and plunger bushing are a pair of of precision pairs, skewed slot are cut on plunger head cylindrical surface, and pass through radial hole, axial hole and top
It communicates, the purpose is to change fuel delivery per cycle；Have on plunger bushing into, oil return hole, is communicated with the upper internal low pressure oil chamber of pump.Oil pump
When work, under the action of the cam and plunger spring on fuel injection camshaft, plunger is forced to make upper and lower reciprocating motion, to
Pump oil task is completed, pump oil process can be divided into following three phases：
Oil inlet process：After the projection portion of cam turns round, under spring force, plunger moves downward, plunger
Upper space generates vacuum degree, after the fuel feed hole on plunger bushing is opened in upper end face, is filled in the oil duct of oil pump upper body
Diesel oil enter pump oil room, plunger motion to lower dead center through oilhole, oil inlet terminates.
Fuel injection system：When camshaft go to cam projection portion jack up roller body when, plunger spring is compressed, plunger to
Upper movement, fuel oil are pressurized, and a part of fuel oil flows back to fuel injection pump body oil pocket through oilhole.When plunger top surface covers fuel feed hole on sleeve
Upper limb when, due to the fit clearance very little of plunger and sleeve, the pump oil room of plunger head is made to become a seal oil chamber, plunger
Continue to rise, the indoor oil pressure of pump oil increases rapidly, pump oil pressure be more than oil outlet valve spring power and high-pressure oil pipe residual compression it
And when, high-pressure diesel enters high-pressure oil pipe after pushing delivery valve open, and combustion chamber is sprayed by hydraulic injection device.
Oil return process：When the skewed slot that plunger is up on plunger is communicated with the oil return hole on sleeve, pump oil room low pressure oil way
Just it is communicated with the mesoporous of plunger head and radial hole and skewed slot, oil pressure declines suddenly, and delivery valve is rapid under spring force
It closes, fuel cut-off.This back-plunger also wants uplink, and after the projection portion of cam turns round, under the action of the spring, plunger is again
Downlink starts next fuel feeding cycle.
The fuel-injection pressure of mechanical pump type fuel injection system is directly related with cam rate, and cam rate is lower, fires
Oil spurts pressure is smaller；Cause mechanical pump type fuel injection system fuel-injection pressure related to engine speed, engine turns
Speed is lower, fuel-injection pressure is smaller；When engine is in the slow-speed of revolution, since its injection pressure is low so that the burning of engine
Emission and fuel economy are by severely restricts；Its injection timing is mechanically restricted simultaneously is unable to flexible variable, cannot be satisfied
IV or more emission regulation demands of state.Therefore, the low problem of above-mentioned low-speed jet pressure and injection timing problem are badly in need of solving.
Utility model content
In view of the above technical problems, a kind of diesel injection system of the utility model offer can in low engine speeds
Mechanical pumping system fuel-injection pressure and injection timing flexible variable are improved, engine emission and fuel economy demand are met.
The technical solution adopted in the utility model is：
The utility model embodiment provides a kind of diesel injection system, including：Mechanical pump, check valve, electric-controlled fuel injector, control
Device, compression pump and fuel tank processed, described compression pump one end are connect with the fuel tank, and the other end is connect with the import of the mechanical pump,
The outlet of the mechanical pump is connect by pipeline with one end of the import of the electric-controlled fuel injector and the check valve respectively, described
The other end of check valve is connect by pipeline with the fuel tank, and the outlet of the electric-controlled fuel injector is connected by pipeline and the fuel tank
It connects, the controller is connect with the electric-controlled fuel injector, and the unlatching of the electric-controlled fuel injector is controlled according to preset control table
And closing.
Optionally, the correspondence between the preset control table characterization engine timing, distributive value and injection pressure.
Optionally, the check valve is high pressure check valve.
Optionally, the compression pump is low-lift pump.
The diesel injection system that the utility model embodiment provides by controller according to preset control table due to being controlled
The opening and closing of electric-controlled fuel injector processed can improve mechanical pumping system fuel-injection pressure and spray in low engine speeds
Oily timing flexible variable, meets engine emission and fuel economy demand.
Description of the drawings
Fig. 1 is the structural schematic diagram for the diesel injection system that the utility model embodiment provides.
Specific implementation mode
In order to make the technical problems, technical solutions and advantages to be solved by the utility model clearer, below in conjunction with attached drawing
And specific embodiment is described in detail.
Fig. 1 is the structural schematic diagram for the diesel injection system that the utility model embodiment provides.As shown in Figure 1, this practicality
The diesel injection system that new embodiment provides, including：Mechanical pump 1, check valve 2, electric-controlled fuel injector 4, controller 5, compression pump 6
With fuel tank 7,6 one end of the compression pump is connect with the fuel tank 7, and the other end is connect with the import of the mechanical pump 1, the machinery
The outlet of pump 1 is connect by pipeline with one end of the import of the electric-controlled fuel injector 4 and the check valve 2 respectively, described unidirectional
The other end of valve 2 is connect by pipeline with the fuel tank 7, and the outlet of the electric-controlled fuel injector 7 is connected by pipeline and the fuel tank 7
It connects, the controller 5 is connect with the electric-controlled fuel injector 4, and controls opening for the electric-controlled fuel injector according to preset control table
It opens and closes.
In the present invention, compression pump 6 is used to the oil in fuel tank 7 being supplied to mechanical pump 1, can be low-lift pump.Machinery
Pump 1 can be mechanical pump in the prior art, and the oil for being provided based on compression pump 6 establishes the injection pressure needed for system.Machinery
It can be connected by pressure duct 3 between pump 1 and electric-controlled fuel injector 4 and check valve 2, fuel oil is supplied to 4 He of electric-controlled fuel injector
Check valve 2.
The check valve 2 of the utility model can be high pressure check valve, and Opening pressure can be 1680~2680bar.Controller 5 can
It, can be by microprocessor (CPU), memory (ROM, RAM), input/output interface (I/ for the electronic control unit installed on vehicle
O), the large scale integrated circuits such as analog-digital converter (A/D) and shaping, driving form, for being controlled according to preset control table
The control of injection timing and distributive value is realized in the unlatching of electric-controlled fuel injector 4.In the present invention, preset control table characterization
Correspondence between engine timing, distributive value and injection pressure can pass through Experimental Calibration.
Specifically, fuel injection system provided by the utility model is in practical application, mechanical pump 1 is established needed for system
Injection pressure, electronic control unit 5 control the opening and closing of electric-controlled fuel injector 4 according to preset control table, i.e., are transported according to engine
Row operating mode controls the opening and closing of electric-controlled fuel injector 4, to realize the control of injection timing and distributive value.When mechanical pump 1 sprays
When the pressure penetrated is less than 2 Opening pressure of high pressure check valve, by mechanical pump 1, high pressure check valve 2, high-pressure oil pipe 3 and electric-controlled fuel injector
The high pressure chest that 4 common closings are formed plays pressure accumulation function；When the pressure that mechanical pump 1 sprays is more than 2 Opening pressure of high pressure check valve
When, in high pressure fuel pressure release to low-voltage fuel case 7, protection system safety.
Embodiment described above, only specific embodiment of the present utility model, to illustrate the technology of the utility model
Scheme, rather than its limitations, the scope of protection of the utility model are not limited thereto, although with reference to the foregoing embodiments to this practicality
It is novel to be described in detail, it will be understood by those of ordinary skill in the art that：Any technology people for being familiar with the art
Member within the technical scope disclosed by the utility model, can still modify to the technical solution recorded in previous embodiment
Or variation or equivalent replacement of some of the technical features can be readily occurred in；And these modifications, variation or replacement,
The spirit and scope for the utility model embodiment technical solution that it does not separate the essence of the corresponding technical solution should all cover at this
Within the protection domain of utility model.Therefore, the scope of protection of the utility model is answered described is with scope of the claims
It is accurate.
Claims (4)
1. a kind of diesel injection system, which is characterized in that including：Mechanical pump, check valve, electric-controlled fuel injector, controller, compression pump
And fuel tank, described compression pump one end are connect with the fuel tank, the other end is connect with the import of the mechanical pump, the mechanical pump
Outlet connect respectively with one end of the import of the electric-controlled fuel injector and the check valve by pipeline, the check valve it is another
End is connect by pipeline with the fuel tank, and the outlet of the electric-controlled fuel injector is connect by pipeline with the fuel tank, the control
Device is connect with the electric-controlled fuel injector, and the opening and closing of the electric-controlled fuel injector are controlled according to preset control table.
2. diesel injection system according to claim 1, which is characterized in that the preset control table characterization engine is just
When, the correspondence between distributive value and injection pressure.
3. diesel injection system according to claim 1, which is characterized in that the check valve is high pressure check valve.
4. diesel injection system according to claim 1, which is characterized in that the compression pump is low-lift pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820032100.6U CN207777005U (en) | 2018-01-09 | 2018-01-09 | A kind of diesel injection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820032100.6U CN207777005U (en) | 2018-01-09 | 2018-01-09 | A kind of diesel injection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207777005U true CN207777005U (en) | 2018-08-28 |
Family
ID=63222775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820032100.6U Active CN207777005U (en) | 2018-01-09 | 2018-01-09 | A kind of diesel injection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207777005U (en) |
-
2018
- 2018-01-09 CN CN201820032100.6U patent/CN207777005U/en active Active
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