CN208595026U - Fuel injection system and its fuel feeding pump assembly - Google Patents
Fuel injection system and its fuel feeding pump assembly Download PDFInfo
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- CN208595026U CN208595026U CN201821255631.8U CN201821255631U CN208595026U CN 208595026 U CN208595026 U CN 208595026U CN 201821255631 U CN201821255631 U CN 201821255631U CN 208595026 U CN208595026 U CN 208595026U
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- feeding pump
- throttle valve
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- 239000000446 fuel Substances 0.000 title claims abstract description 97
- 238000002347 injection Methods 0.000 title claims abstract description 28
- 239000007924 injection Substances 0.000 title claims abstract description 28
- 239000002828 fuel tank Substances 0.000 claims abstract description 16
- 239000003921 oil Substances 0.000 claims description 117
- 239000000295 fuel oil Substances 0.000 claims description 26
- 239000013068 control sample Substances 0.000 claims description 16
- 238000011144 upstream manufacturing Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 6
- 239000010761 intermediate fuel oil Substances 0.000 claims description 4
- 239000000523 sample Substances 0.000 claims description 3
- 238000000605 extraction Methods 0.000 description 11
- 239000007921 spray Substances 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
A kind of fuel injection system and its fuel feeding pump assembly, the fuel feeding pump assembly includes: oil feed pump, and oil inlet is connected to fuel tank by oil inlet passage；Metering units are connected to the oil discharge outlet of oil feed pump by oil drain passage；Main filter is arranged in oil drain passage；Overflow valve is arranged in overflow ducts, which is connected to the oil drain passage and is connected to lead to the return flow line of fuel tank；It is characterized in that, the fuel feeding pump assembly further includes the adjustable throttle valve of aperture, the throttle valve is arranged in oil inlet passage, and has the aperture based on fuel pressure and/or flow control in overflow ducts.The efficiency of fuel injection system can be improved.
Description
Technical field
This application involves a kind of fuel feeding pump assembly for fuel injection system and the combustions comprising this fuel feeding pump assembly
Electronic fuel injection system.
Background technique
Common rail type fuel injection system is commonly used in vehicle, mechanical equipment, oil-fired power generating equipment etc..Common-rail type fuel oil
Spraying system generally includes low pressure oil supply pump, high potential assembly and common rail.Oil feed pump conveys precharge fuel oil in a manner of measuring
To high potential assembly, and high potential assembly pressurization fuel oil, fuel oil is then supplied to common rail with high pressure, the high pressure fuel in common rail is sprayed
It is mapped in engine.
A kind of low-pressure side part of common rail type fuel injection system is shown in Fig. 1, including oil feed pump (low-lift pump)
1, fuel oil is extracted from fuel tank 2, the oil inlet side and oil extraction side of oil feed pump 1 are respectively arranged coarse filter 3 and main filter 4.For
The fuel oil that oil pump 1 extracts is conveyed in a manner of metering to high potential assembly through metering units 5.Overflow valve 6 is single for that will not be measured
The excess fuel of 5 conveying of member returns to fuel tank 2.In addition, there also is provided flow controller 7, for limiting in the oil inlet side of oil feed pump 1
The oil inlet flow of oil feed pump 1.The flow controller 7 has fixed aperture (orifice size), so that oil feed pump 1 has substantially perseverance
Fixed fuel supply flow rate.Under the lesser operating condition of amount of fuel conveyed through metering units 5, has a large amount of fuel oil and returned from overflow valve 6
Oil tank 2 is flowed to, to cause to waste.In addition, in the lower area of environmental pressure, such as high altitude localities, due to oil inlet side pressure
Power is lower, and the supply capability that may result in oil feed pump 1 in startup stage declines, and it is unstable that this may cause engine start.
Utility model content
The purpose of the application is the section with fixed aperture for avoiding the oil feed pump oil inlet side of common rail type fuel injection system
Flow deficiency caused by device.
For this purpose, providing a kind of fuel feeding pump assembly according to the one aspect of the application, it is used in fuel injection system, uses
In supplying fuel oil to high potential assembly, the fuel feeding pump assembly includes: oil feed pump, and oil inlet is connected to oil by oil inlet passage
Case；Metering units are connected to the oil discharge outlet of oil feed pump by oil drain passage；Main filter is arranged in oil drain passage；It overflows
Valve is flowed, is arranged in overflow ducts, which is connected to the oil drain passage and is connected to lead to the reflux of fuel tank
Channel；It is characterized in that, the fuel feeding pump assembly further includes the adjustable throttle valve of aperture, the throttle valve is arranged in oil inlet passage
In, and there is the aperture based on fuel pressure and/or flow control in overflow ducts.
According to a kind of embodiments possible, the throttle valve is pressure control throttle valve, is had by aperture control channel
The aperture of intermediate fuel oil pressure control, the aperture control channel are connected to overflow ducts in aperture control sample point.
According to a kind of embodiments possible, flow controller is equipped in aperture control channel.
According to a kind of embodiments possible, the throttle valve is Electromagnetic Control type throttle valve, is had based in aperture control
The overflow ducts intermediate fuel oil pressure of sample point detection and/or the aperture of flow control.
According to a kind of embodiments possible, the throttle valve has the fuel pressure and/or stream in aperture control sample point
Amount is higher than the aperture reduced when corresponding a reference value, and is lower than accordingly in the fuel pressure and/or flow of aperture control sample point
The aperture increased when a reference value.
According to a kind of embodiments possible, the throttle valve has the fuel pressure and/or stream in aperture control sample point
Amount is higher than corresponding a reference value and adds the aperture reduced when a upper limit deviation, and the fuel pressure in aperture control sample point
And/or flow subtracts the aperture increased when a lower limit deviation lower than corresponding a reference value.
According to a kind of embodiments possible, the upper limit deviation and lower limit deviation be corresponding a reference value 15% or with
Under, or accordingly 10% or less of a reference value.
According to a kind of embodiments possible, the aperture control sample point is arranged in the tract of overflow ducts；Or
It is arranged in the Upstream section of overflow ducts；Or be arranged in oil drain passage, between main filter and metering units；Or
It is arranged at the tie point between overflow ducts and oil drain passage.
According to a kind of embodiments possible, coarse filter is equipped in the oil inlet passage, the throttle valve is arranged in described
Between coarse filter and oil feed pump.
The application provides in another aspect a kind of fuel injection system comprising foregoing fuel feeding pump assembly, with
And at least one high potential assembly, the high potential assembly supply fuel oil by the fuel feeding pump group.
According to the application, oil feed pump oil inlet side is provided with the adjustable throttle valve of aperture, and the aperture of throttle valve depends on fuel feeding
Pump oil extraction lateral pressure.In this way, when oil feed pump oil extraction lateral pressure is excessively high, control throttle valve reduces aperture, reduce oil feed pump into
Oil mass, to reduce the oil mass of reflux, improves the efficiency of common rail type fuel injection system to reduce oil feed pump oil extraction lateral pressure,
It avoids wasting.
On the other hand, when oil feed pump oil extraction lateral pressure is too low, control throttle valve increases aperture, to increase oil feed pump
Oil inlet quantity increases oil feed pump oil extraction lateral pressure, so that it is guaranteed that with enough fuel pressures and flow to high potential assembly fuel feeding, it is ensured that
Run well to engine stabilizer.When ambient pressure is lower, such as in high altitude localities, fuel feeding can be increased in this way
The oil inlet quantity of pump, to ensure that oil feed pump normally starts and operates and engine normally starts and operates.
Further, since can always ensure that oil feed pump supplies fuel oil to metering units with enough flows and pressure, without
Must maintain high pressure and high flow capacity in oil feed pump oil extraction side, therefore relatively small main filter can be used, thus save at
This.
Detailed description of the invention
The detailed description done by referring to accompanying drawing is more fully understood the various aspects of the application, in attached drawing
In:
Fig. 1 is a kind of schematic layout figure of common rail type fuel injection system low-pressure side part according to prior art；
Fig. 2 is according to a kind of schematic layout figure of the common rail type fuel injection system of embodiment of the application；
Fig. 3,4 are schematic layout figures according to the common rail type fuel injection system of the application alternate embodiments.
Specific embodiment
Fig. 2 illustrates a kind of total structure of the common rail type fuel injection system of embodiments possible according to the application.
The fuel injection system is used to spray fuel oil, such as diesel oil to engine (not shown).
Fuel injection system includes fuel feeding pump assembly and high potential assembly.Fuel feeding pump assembly includes oil feed pump (low-lift pump) 1, example
Such as vane pump, gear pump, oil inlet is connected to oil inlet passage L1, oil discharge outlet is connected to oil drain passage L2.Oil inlet passage L1
Fuel tank 2 is extended to, and arranges coarse filter 3 or primary filter in oil inlet passage L1.Use is arranged in oil drain passage L2
The main filter 4 of dirt in filter fuel, and oil drain passage L2 extends to the inlet port of metering units 5.Main filtering
Device 4 divides oil drain passage L2 for Upstream section and tract.Metering units 5 are generally open type, but the application also covers use
The embodiment of closed type metering units.Metering units 5 are alternately turned on and are closed with scheduled duty ratio.Metering units 5
Output port is connected to transfer passage L3, and transfer passage L3 leads to high potential assembly.
Return flow line L4 extends to fuel tank 2, and the fuel oil for revealing all parts of fuel injection system returns to oil
In case 2.The upstream end of overflow ducts L5 is connected to oil drain passage L2 in flooding point " A ", and downstream is connected to return flow line L4.It overflows
Stream valve 6 is arranged in overflow ducts L5, for the excess fuel in oil drain passage L2 to be discharged into the L4 of return flow line, overflow valve
6 divide overflow ducts L5 for Upstream section and tract.
It is noted that the stream of fuel oil in each channel when term " upstream " and " downstream " are referring to fuel injection system work
Dynamic definition.
The upstream end of throttling passage L6 is connected to transfer passage L3 in throttle point " B ", and downstream is connected to return flow line L4.
Flow controller 8 is arranged in throttling passage L6, for the excess fuel in transfer passage L3 to be discharged into the L4 of return flow line.
Optional exhaust valve 9 is being connected to oil inlet passage at the oil inlet of oil feed pump 1 and two positions of oil discharge outlet
Between L1 and oil drain passage L2, supplied for discharging after oil feed pump 1 is mounted and/or after main filter 4 is mounted or is replaced
Air in oil pump 1 and main filter 4 and the channel being connected with them may be vented by means of manual pump (not shown).
The high potential assembly of fuel injection system is conveyed precharge fuel oil from fuel feeding pump assembly.High potential assembly includes being arranged in
Multiple driving mechanisms 11 in shell 10, they and share public drive shaft and multiple piston pumps 12, respectively by corresponding
Driving mechanism 11 drive.
Each piston pump 12 is respectively provided with inlet port and output port, and the inlet port is connected to transfer passage L3,
The output port is connected to common rail 13 through branched bottom L7.Piston pump 12 is respectively equipped with Leakage Energy channel (not shown),
It is connected to return flow line L4.Common rail 13 is configured to inject fuel into engine (not shown), and equipped with being connected to
The overflow ducts L8 of return flow line L4, overflow valve 14 are arranged in overflow ducts L8.
In addition, in oil inlet passage L1, in the upstream side of oil feed pump 1, specifically in coarse filter 3 and oil feed pump 1
Between, arrange the adjustable throttle valve 15 of aperture.The aperture of throttle valve 15 can be pressure control, and control pressure is derived from confession
The oil extraction side of oil pump 1, such as it is derived from overflow ducts L5.
In the example shown in Fig. 2, the control pressure of 15 aperture of throttle valve is provided by aperture control channel L9.Aperture control
On the one hand channel L9 is connected to overflow ducts L5 in aperture control sample point " C " for being located at 6 downstream of overflow valve, on the other hand connect
To the control port of throttle valve 15.Flow controller 16 is arranged in aperture control channel L9, logical in aperture control for adjusting fuel oil
Flowing in road L9.
A pressure reference value can be set for the control pressure of 15 aperture of throttle valve.Pressure in overflow ducts L5
When higher than the pressure reference value, the aperture of throttle valve 15 reduces, and when the pressure in overflow ducts L5 is lower than the pressure reference value
When, the aperture of throttle valve 15 increases.
It is appreciated that the aperture in order to avoid throttle valve 15 is frequently adjusted repeatedly, the aperture of throttle valve 15 can be set
It is set to the pressure in overflow ducts L5 and is higher than the pressure reference value plus a upper limit deviation or lower than the pressure reference value
When subtracting a lower limit deviation, the aperture of throttle valve 15 is decreased or increased.
It will be appreciated, of course, that the aperture of throttle valve 15 is also possible to Electromagnetic Control type, i.e., set in aperture control sample point
Pressure sensor and/or flow sensor are set, in the oil extraction side of oil feed pump 1, such as 6 detected downstream overflow ducts of overflow valve
Pressure and/or flow in L5.The controller of fuel injection system is higher or lower than corresponding in the pressure and/or flow of detection
When a reference value, aperture regulation signal is issued to the Electromagnetic Control element of throttle valve 15.That is, if the pressure and/or flow of detection
Higher than corresponding a reference value, then the aperture of throttle valve 15 is reduced, and if the pressure and/or flow of detection are lower than corresponding base
Quasi- value, then increase the aperture of throttle valve 15.In this case, pressure and/or the flow height in detection be may be set to be
When corresponding a reference value adds a upper limit deviation or subtracts a lower limit deviation lower than corresponding a reference value, control
Aperture is decreased or increased in throttle valve 15.
The upper limit deviation and lower limit deviation can be 15% or hereinafter, or 10% or less of corresponding a reference value.
The upper limit deviation and lower limit deviation can be the same or different from each other.
It is appreciated that aperture control sample point C can also 4 downstream of main filter be arranged in oil drain passage L2 (referring to
Variant shown in Fig. 3), or be arranged in overflow ducts L5 in 6 upstream of overflow valve (referring to variant shown in Fig. 4), or
It is arranged to be overlapped with flooding point " A ".
In the fuel injection system operation of the application, oil feed pump 1 is activated, and is extracted from fuel tank 2 through oil inlet passage L1
Fuel oil, and by fuel emission into oil drain passage L2.Fuel oil in oil drain passage L2 flows to metering units 5 simultaneously through transfer passage L3
Measured unit 5 is conveyed in a manner of metering to high potential assembly, and the redundance that not measured unit 5 conveys in fuel oil, which enters, to overflow
In circulation road L5, overflow valve 6 is flowed through, then flow into the L4 of return flow line and returns to fuel tank 2.
The fuel oil of metering conveying in transfer passage L3 is conveyed towards high potential assembly, and it is extra in the fuel oil of conveying to measure
Part enters in throttling passage L6, flows through flow controller 8, then flows into the L4 of return flow line and returns to fuel tank 2.
High potential assembly receives fuel oil from transfer passage L3, fuel oil is pressurized to high pressure by piston pump 12, then by high compression ignition
Oil is supplied in common rail 13 through branched bottom L7.Then, the high pressure fuel in common rail 13 can be injected into engine.
Fuel oil in the routine operation of fuel injection system, at aperture control sample point " C " of 1 oil extraction side of oil feed pump
When pressure and/or flow are higher than corresponding a reference value (or a reference value adds a upper limit deviation), this illustrates that oil feed pump 1 is supplied
Amount of fuel it is bigger than normal, while overflow return fuel tank 2 amount of fuel it is also bigger than normal.In this case, by means of aperture control channel
L9 is transported to the fuel pressure of the control port of throttle valve 15, or by means of controller to the Electromagnetic Control element of throttle valve 15
The aperture of the aperture regulation signal of sending, throttle valve 15 reduces, so that the amount of fuel that oil feed pump 1 is extracted from fuel tank reduces.In this way,
System effectiveness can be improved, reduce leakage rate.
On the other hand, the fuel pressure at aperture control sample point " C " of 1 oil extraction side of oil feed pump and/or flow are lower than
When corresponding a reference value (or a reference value subtracts a lower limit deviation), this illustrates that the amount of fuel that oil feed pump 1 is supplied is insufficient, and this
It may cause the fuel pressure or underfed to engine spray, influence the work of engine, especially engine start.?
In this case, it is transported to the fuel pressure of the control port of throttle valve 15 by means of aperture control channel L9, or by means of
The aperture of the aperture regulation signal that controller is issued to the Electromagnetic Control element of throttle valve 15, throttle valve 15 increases, thus fuel feeding
The amount of fuel that pump 1 is extracted from fuel tank increases.In this way it can be ensured that the fuel oil of engine spray enough pressure and flow, it is ensured that
Engine work or starting.
By the adjustable throttle valve 15 of aperture, the closed loop feedback control of the supply capability to oil feed pump 1 is realized.
It may be noted that in the lower area of environmental pressure, such as high altitude localities, due to oil feed pump oil inlet lateral pressure compared with
It is low, may result in oil feed pump 1 at work, the supply capability of especially startup stage is insufficient, this can also be embodied in aperture control
The fuel pressure and/or flow at sampling point " C " are produced lower than corresponding a reference value (or a reference value subtracts a lower limit deviation).
Since the aperture of throttle valve 15 in this case is increased, thus the amount of fuel that oil feed pump 1 is extracted from fuel tank increases, it is ensured that supplies
The operating of the supply capability and engine of oil pump 1.In this way, the application range of the fuel injection system of the application can expand, example
It is such as expanded to and is used in high altitude localities.
Furthermore, it is assumed that the aperture of the throttle valve of 1 oil inlet side of oil feed pump is non-adjustable, then in order to ensure in all working item
Oil feed pump 1 can the enough amount of fuel of fuel feeding under part, it is necessary to by the fuel flow in oil drain passage L2 maintain one it is high-level,
Correspondingly need the main filter 3 using big specification.And according to the application, it, can after using the adjustable throttle valve 15 of aperture
Closed loop feedback control is carried out with the supply capability to oil feed pump 1, because without maintaining the fuel flow in oil drain passage L2
One high-level.It correspondingly, can be using the main filter 3 compared with small dimension.In this way, the expense of main filter 3 can be reduced.
In conclusion by using the adjustable throttle valve 15 of aperture, so that entire fuel injection system obtains comprehensive effect
Benefit.
Although describing the application herein with reference to specific embodiment, scope of the present application is not limited to shown
Details.Without departing from the basic principle of the application, various modifications can be made for these details.
Claims (10)
1. a kind of fuel feeding pump assembly is used in fuel injection system, for supplying fuel oil, the fuel feeding pump assembly to high potential assembly
Include:
Oil feed pump (1), oil inlet are connected to fuel tank (2) by oil inlet passage (L1)；
Metering units (5) are connected to the oil discharge outlet of oil feed pump by oil drain passage (L2)；
Main filter (4), is arranged in oil drain passage；
Overflow valve (6) is arranged in overflow ducts (L5), which is connected to the oil drain passage (L2) and connects
Lead to the return flow line (L4) of fuel tank；
It is characterized in that, the fuel feeding pump assembly further includes the adjustable throttle valve of aperture (15), the throttle valve is arranged in oil inlet
In channel (L1), and there is the aperture based on fuel pressure and/or flow control in overflow ducts.
2. fuel feeding pump assembly as described in claim 1, which is characterized in that the throttle valve is pressure control throttle valve, tool
There is the aperture controlled by aperture control channel (L9) intermediate fuel oil pressure, the aperture control channel is in aperture control sample point connection
To overflow ducts.
3. fuel feeding pump assembly as claimed in claim 2, which is characterized in that be equipped with flow controller in aperture control channel (L9)
(16)。
4. fuel feeding pump assembly as described in claim 1, which is characterized in that the throttle valve is Electromagnetic Control type throttle valve, tool
Have based in the overflow ducts intermediate fuel oil pressure of aperture control sample point detection and/or the aperture of flow control.
5. the fuel feeding pump assembly as described in any one of claim 2 to 4, which is characterized in that the throttle valve has in aperture
The fuel pressure and/or flow for controlling sample point are higher than the aperture reduced when corresponding a reference value, and control sample point in aperture
Fuel pressure and/or the flow aperture that increases when being lower than corresponding a reference value.
6. fuel feeding pump assembly as claimed in claim 5, which is characterized in that the throttle valve has in aperture control sample point
Fuel pressure and/or flow are higher than corresponding a reference value and add the aperture reduced when a upper limit deviation, and control in aperture
The fuel pressure and/or flow of sample point subtract the aperture increased when a lower limit deviation lower than corresponding a reference value.
7. fuel feeding pump assembly as claimed in claim 6, which is characterized in that the upper limit deviation and lower limit deviation are corresponding
A reference value 15% or hereinafter, or corresponding a reference value 10% or less.
8. the fuel feeding pump assembly as described in any one of claim 2 to 4, which is characterized in that the aperture control sample point is set
It sets in the tract of overflow ducts (L5)；
Or it is arranged in the Upstream section of overflow ducts (L5)；
Or be arranged in oil drain passage (L2), between main filter (4) and metering units (5)；
Or at the tie point being arranged between overflow ducts (L5) and oil drain passage (L2).
9. fuel feeding pump assembly according to any one of claims 1 to 4, which is characterized in that set in the oil inlet passage (L1)
Have coarse filter (3), the throttle valve (15) is arranged between the coarse filter and oil feed pump (1).
10. a kind of fuel injection system, which is characterized in that including fuel feeding pump group as claimed in any one of claims 1-9 wherein
Part and at least one high potential assembly, the high potential assembly supply fuel oil by the fuel feeding pump group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821255631.8U CN208595026U (en) | 2018-08-06 | 2018-08-06 | Fuel injection system and its fuel feeding pump assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821255631.8U CN208595026U (en) | 2018-08-06 | 2018-08-06 | Fuel injection system and its fuel feeding pump assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208595026U true CN208595026U (en) | 2019-03-12 |
Family
ID=65604334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821255631.8U Active CN208595026U (en) | 2018-08-06 | 2018-08-06 | Fuel injection system and its fuel feeding pump assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208595026U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110410248A (en) * | 2019-06-19 | 2019-11-05 | 三一重机有限公司 | Engine fuel oil system and engineering machinery |
| CN113464303A (en) * | 2021-08-17 | 2021-10-01 | 安徽江淮汽车集团股份有限公司 | Engine fuel pressure control method |
-
2018
- 2018-08-06 CN CN201821255631.8U patent/CN208595026U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110410248A (en) * | 2019-06-19 | 2019-11-05 | 三一重机有限公司 | Engine fuel oil system and engineering machinery |
| CN113464303A (en) * | 2021-08-17 | 2021-10-01 | 安徽江淮汽车集团股份有限公司 | Engine fuel pressure control method |
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