CN110462200A - Common rail fuel injection device - Google Patents
Common rail fuel injection device Download PDFInfo
- Publication number
- CN110462200A CN110462200A CN201880019394.1A CN201880019394A CN110462200A CN 110462200 A CN110462200 A CN 110462200A CN 201880019394 A CN201880019394 A CN 201880019394A CN 110462200 A CN110462200 A CN 110462200A
- Authority
- CN
- China
- Prior art keywords
- common rail
- pressure
- injection device
- fuel injection
- reducing valve
- 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.)
- Granted
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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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The common rail fuel injection device that can prevent air from flowing into injector in crank rotation is provided.Common rail fuel injection device has: common rail, which has pressure reducing valve, with hig pressure storage fuel；Test section detects the pressure in common rail；And control unit, based on the pressure obtained from test section, determines whether to be mixed into air at intervals of set time, and in the case where being judged to being mixed into air in crank rotation, makes pressure reducing valve open during the driving time shorter than the stipulated time.
Description
Technical field
The present invention relates to common rail fuel injection devices.
Background technique
In the past, there are a kind of common rail fuel injection device, in the common rail fuel injection device, the fuel quilt of fuel tank
Simultaneously force feed is to common rail for high-pressure pump pressurization, via the injector connecting with common rail, to engine spray high pressure fuel.
Existing technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2005-291075 bulletin
Summary of the invention
Problems to be solved by the invention
However, for example, if not running for a long time, air invades height from fuel tank etc. sometimes after stopping engine
Press pump.The air is flowed into injector from high-pressure pump by common rail in crank rotation.Air is from injector and fuel one as a result,
It rises and is sprayed, therefore have the following problems: the fuel of accurate the amount of injection can not be sprayed, engine can not be started sometimes.
The present invention provides the common rail fuel injection device that can prevent air from flowing into injector in crank rotation.
Solution to problem
Common rail fuel injection device of the invention has:
Common rail, which has pressure reducing valve, with hig pressure storage fuel；
Test section detects the pressure in the common rail；And
Control unit, in crank rotation, based on the pressure obtained from the test section, judgement at intervals of set time is
It is no to be mixed into air, and in the case where being judged to being mixed into air, make during the driving time shorter than the stipulated time
The pressure reducing valve is open.
Invention effect
In accordance with the invention it is possible to prevent air from flowing into injector in crank rotation.
Detailed description of the invention
Fig. 1 is the frame for indicating an example of the overall structure of common rail fuel injection device of one embodiment of the present invention
Figure.
Fig. 2 is the flow chart of deflation processing when indicating crank rotation.
Fig. 3 is the timing diagram for indicating an example of movement of the common rail fuel injection device in present embodiment.
Fig. 4 is the block diagram for indicating an example of the overall structure of common rail fuel injection device of variation.
Specific embodiment
In the following, one embodiment of the present invention is described in detail referring to attached drawing.
The structure of the common rail fuel injection device of one embodiment of the present invention 100 is illustrated referring to Fig.1.
Fig. 1 is the block diagram for indicating an example of overall structure of common rail fuel injection device 100.Carry plagued common rail fuel spray
The internal combustion engine 1 of injection device 100 is the diesel engine with multiple cylinders.
Common rail fuel injection device 100 shown in FIG. 1 has: injector 2, common rail 3, force lift 4, pressure reducing valve 5, pressure
Sensor 10 (corresponding with " test section " of the invention), electronic control unit (ECU) 20 (corresponding with " control unit " of the invention).
Injector 2 is to cylinder inner direct fuel.
Common rail 3 stores the fuel supplied to injector 2 with high pressure conditions.
Force lift 4 is to 3 force feed fuel of common rail.Force lift 4 has supply pump 12 and high-pressure pump 13.
Supply pump 12 is the pump for drawing fuel from fuel tank 11.
High-pressure pump 13 is the pump for sucking the low-pressure fuel from supply pump 12 and spraying high pressure fuel.High-pressure pump 13 has
It is slided in pumping cylinder to spray the plunger (illustration omitted) of the fuel of high pressure.
Pressure reducing valve 5 is set to the one end of the length direction of common rail 3.Pressure reducing valve 5 is via fuel return access and fuel tank
11 connections.Pressure reducing valve 5 enables the fuel in common rail 3 to be back to fuel tank 11 via fuel return access by opening and closing.Subtract
Pressure valve 5 is configured to change aperture.By the decompression valve drive signal (aftermentioned) from ECU20, electronics is carried out to pressure reducing valve 5
Control.
Pressure sensor 10 is set to the other end of the length direction of common rail 3.Pressure sensor 10 to common rail press Pc into
Row detection.
Various sensors are electrically connected with ECU20.Specifically, pressure sensor 10 is electrically connected with ECU20.ECU20 is in song
T1 obtains common rail and presses Pc at intervals of set time when axis rotates.
ECU20 is based on common rail pressure Pc and determines whether to be mixed into air (referred to as " air is mixed into judgement ") in common rail 3.This
Outside, in the present embodiment, ECU20 is determined as in the case where common rail pressure Pc is lower than specified value Pa (referring to Fig. 2) in common rail 3
Inside it has been mixed into air.In addition, specified value Pa is determined according to the type of engine.
Crank rotation speed detection sensor 16 for detecting crank rotation speed is electrically connected with ECU20.ECU20 is obtained
Crank rotation speed.ECU20 determines stipulated time T1 and driving time T2 (aftermentioned) according to crank rotation speed.Time T1, T2
It is stored in the internal storage of ECU20.Here, as shown in figure 3, the relationship of time T1, T2 are the relationship of T1 > T2.For example, In
When being stored with the time T1 that can repeatedly obtain common rail pressure Pc in crank rotation in the internal storage of ECU20 and being less than
Between T1 time T2.Crank rotation speed is faster, then time T1, T2 is respectively set as shorter.In addition, time T1, T2 are bases
What the result of experiment or emulation acquired.
ECU20 has: timer (illustration omitted), comparing section 22 and pressure reducing valve control unit 24.
Comparing section 22 is compared above-mentioned common rail pressure Pc and specified value Pa in crank rotation.Comparing section 22 will compare
Result after relatively is exported to pressure reducing valve control unit 24.
Pressure reducing valve control unit 24 is opened and closed pressure reducing valve 5 by depressurizing valve drive signal.By the way that pressure reducing valve 5 is open, thus
Common rail pressure Pc is depressurized, fuel return to fuel tank 11.In addition, in the case where being mixed into air in common rail 3, air and combustion
(referred to as " deflating ") is discharged from common rail 3 together in material.In addition, pressure reducing valve control unit 24 changes pressure reducing valve by decompression valve drive signal
5 aperture.The amount of the fuel and air that flow back to fuel tank 11 is adjusted as a result,.
Pressure reducing valve control unit 24 based on to common rail pressure Pc and specified value Pa be compared after as a result, at intervals of set time
T1 makes the open driving time T2 of pressure reducing valve 5, until common rail pressure Pc becomes specified value Pa or more.
<deflation processing when crank rotation>
Then, an example of deflation processing when referring to Fig. 2 to crank rotation is illustrated.It should be noted that having connected electricity
Processing shown in Fig. 2 is executed in the case where source.
In the step s 100, ECU20 judges whether crank rotation has started.ECU20 is the case where crank rotation has started
Under (step S100: "Yes"), make processing be transferred to step S110.ECU20 (step in the case where crank rotation does not start
S100: "No"), make that processing returns to step S100.
In step s 110, ECU20 obtains common rail and presses Pc.
In the step s 120, ECU20 resets timer, to counting from obtaining common rail pressure Pc by time T.
In step s 130, ECU20 (specifically comparing section 22) is compared common rail pressure Pc and specified value Pa.
ECU20 (specifically pressure reducing valve control unit 24) common rail pressure Pc be specified value Pa or more in the case where (step S130:
"No"), it ends processing.On the other hand, ECU20 makes in the case where common rail pressure Pc is less than specified value Pa (step S130: "Yes")
Pressure reducing valve 5 open (step S140) during driving time T2.The air in common rail 3 is discharged as a result,.Later, ECU20 makes
Processing is transferred to step S150.
In step S150, ECU20 abandons common rail and presses Pc.
In step S160, whether ECU20 judgement is stipulated time T1 or more by time T.
ECU20 is transferred to processing in the case where being stipulated time T1 or more by time T (step S160: "Yes")
Step S110.On the other hand, ECU20 makes to locate in the case where being less than stipulated time T1 by time T (step S160: "No")
Reason is back to step S160.
Fig. 3 is the timing diagram for indicating an example of movement of common rail fuel injection device 100.In the upside of Fig. 3, horizontal axis table
Show the time, the longitudinal axis indicates that common rail presses Pc.In addition, indicating ECU20 common rail pressure Pc obtained with "×" symbol.In addition, Fig. 3's
Downside, horizontal axis indicate the time, and the longitudinal axis indicates the open and-shut mode of pressure reducing valve 5.Preset crank rotation and hair is shown in FIG. 3
The period of motivation starting.
ECU20 is judged to being mixed into common rail 3 in the case that common rail obtained in t1 pressure Pc is less than specified value Pa
Air keeps pressure reducing valve 5 open during the driving time T2 until when from t1 up to t2 after stipulated time T1.
In t2, common rail obtained pressure Pc is again smaller than specified value Pa, thus when t1 in the same manner as, ECU20 from t2 up to
During driving time T2 until t3 after stipulated time T1, keep pressure reducing valve 5 open.
In t3, common rail obtained pressure Pc is again smaller than specified value Pa, thus when t1 and when t2 in the same manner as, ECU20 from
During driving time T2 until t4 when t3 after stipulated time T1, keep pressure reducing valve 5 open.
In t4, common rail obtained pressure Pc is specified value Pa or more.ECU20 is judged to not being mixed into air in common rail 3,
Do not make pressure reducing valve 5 open.ECU20 can prevent air from flowing into injector 2, and spray the fuel of accurate the amount of injection.Therefore, energy
Enough start engine.
<effect of present embodiment>
As described above, the common rail fuel injection device 100 of present embodiment has: common rail 3, the common rail 3 have decompression
Valve 5, with hig pressure storage fuel；Pressure sensor 10 detects the pressure in common rail 3；And ECU20, in crank rotation
When, Pc is pressed based on the common rail that obtains from pressure sensor 10, determines whether common rail pressure Pc is less than specified value, from obtaining common rail pressure
Pc rises in during the stipulated time T1 until the common rail pressure Pc obtained next time, makes the open driving time T2 of pressure reducing valve 5, directly
Become specified value Pa or more to common rail pressure Pc.As a result, when in common rail 3 there are in the mixed situation of air, in crank rotation
When, air is discharged from common rail 3 with the interval of stipulated time T1, so as to be mixed into common rail 3 in crank rotation
Air capacity gradually decreases.Therefore, it can prevent air from flowing into injector 2 in crank rotation.
In addition, common rail fuel injection device 100 according to the present embodiment is, it is specified that time T1 is according to crank rotation speed
What degree determined.Determine whether to be mixed into air in crank rotation as a result, in common rail 3, therefore can be based on judgement as a result, In
Air is discharged out of common rail 3.
In addition, common rail fuel injection device 100 according to the present embodiment, driving time T2 is according to crank rotation speed
What degree determined.Air is discharged out of common rail 3 as a result, therefore can prevent air from flowing into injector 2.
In addition, common rail fuel injection device 100 according to the present embodiment, pressure reducing valve control unit 24 are passed according to from pressure
The aperture for the common rail pressure Pc control pressure reducing valve 5 that sensor 10 obtains.As a result, for example, if common rail presses the pressure between Pc and specified value Pa
Power difference is larger, then improves aperture, thus, it is possible to increase the air capacity of unit time being discharged out of common rail 3, each, to make sky
Gas is discharged out of common rail 3 with the short time.In addition, can reliably make air be discharged in crank rotation out of common rail 3.
In addition, common rail fuel injection device 100 according to the present embodiment, for common rail is pressed Pc in crank rotation
It is increased to any degree, is to be set according to the type of engine, therefore the specified value Pa that rail pressure Pc is compared together is root
It is determined according to the type of engine.Comparing section 22 is compared common rail pressure Pc and specified value Pa appropriate as a result, pressure reducing valve control
It portion 24 processed can be based on after comparison as a result, exporting decompression valve drive signal appropriate.
<modified embodiment of the present embodiment>
Then, modified embodiment of the present embodiment is illustrated referring to Fig. 4.Fig. 4 is to indicate common rail fuel injection device
The block diagram of an example of 100 overall structure.In addition, in the explanation of variation, mainly to knot different from the embodiment described above
Structure is illustrated, and is marked with identical appended drawing reference for identical structure and the description thereof will be omitted.
In the ECU20 of above embodiment, comparing section 22 is compared common rail pressure Pc and specified value Pa.Pressure reducing valve control
Portion 24 processed is exported valve control signal is depressurized to pressure reducing valve 5, keeps pressure reducing valve 5 open during driving time T2, until common rail
Until pressing Pc to become specified value Pa or more.
In contrast, T1 is based on from pressure pressure variety calculation part 26 at intervals of set time in the ECU20 of variation
The pressure that sensor 10 obtains, the variation delta P of the pressure in computational rules time T1.In addition, comparing section 22A is to calculated
The variation delta P and specified value Pb of pressure are compared.In addition, pressure reducing valve control unit 24 is less than rule in the variation delta P of pressure
In the case where definite value Pb, decompression valve control signal is exported to pressure reducing valve 5, so that pressure reducing valve 5 opens driving time T2.As a result,
, there are in the mixed situation of air, air is discharged out of common rail 3 in crank rotation when in common rail 3.Therefore, Neng Gou
Prevent air from flowing into injector 2 when crank rotation.
In addition, pressure reducing valve control unit 24 improves the aperture of pressure reducing valve 5 according to the variable quantity of pressure.Thereby, it is possible to from altogether
It by Efficient air is discharged in rail 3, prevents air from flowing into injector 2.
In addition, can also determine specified value Pb according to the type of engine in above-mentioned variation.It is every in crank rotation
The variable quantity of the common rail pressure Pc of a stipulated time T1 is to be set according to the type of engine, therefore carry out with the variable quantity of pressure
The specified value Pb compared is determined according to the type of engine.Variable quantity and appropriate rule of the comparing section 22A to pressure as a result,
Definite value Pb is compared, and pressure reducing valve control unit 24 can be based on after comparison as a result, exporting decompression valve drive signal appropriate.
In addition, deflation when for crank rotation in above-mentioned variation is handled, can replace in above embodiment
It deflates and handles and carry out, combine in addition, can be handled with the deflation in above embodiment to carry out.With above embodiment
In deflation processing combination in the case where, in pressure can be specified value Pa or more or the variable quantity of pressure be specified value Pb with
Stopping deflation in the case where upper, can also be specified value Pa or more in pressure and the variable quantity of pressure is specified value Pb or more
In the case of stop deflate.Thereby, it is possible to precisely carry out that the mixed judgement of air can more reliably be started and be started
Machine.
In addition, pressure reducing valve control unit 24 is controlled based on the variable quantity of the pressure in stipulated time T1 in above-mentioned variation
Pressure reducing valve 5, however, the present invention is not limited thereto, can based on the first pressure and second pressure obtained with the interval of stipulated time T1 it
Between pressure difference control pressure reducing valve 5, can also be based on being needed until generating the pressure difference between first pressure and second pressure
The required time wanted controls pressure reducing valve 5.
Industrial applicibility
Based on the Japanese patent application proposed on April 4th, 2017, (Japanese patent application laid is willing to 2017- to the application
074631), content is introduced in this as reference.
Common rail fuel injection device of the invention prevents the bavin of air inflow injector as requirement in crank rotation
Oil turbine is useful.
Description of symbols
1 internal combustion engine
2 injectors
3 common rails
4 force lifts
5 pressure reducing valves
10 pressure sensors
11 fuel tanks
12 supply pumps
13 high-pressure pumps
16 crank rotation speed detection sensors
20ECU
22 comparing sections
22A comparing section
24 pressure reducing valve control units
26 pressure variety calculation parts
100 common rail fuel injection devices
Claims (9)
1. a kind of common rail fuel injection device, has:
Common rail, which has pressure reducing valve, with hig pressure storage fuel；
Test section detects the pressure in the common rail；And
Control unit, based on the pressure obtained from the test section, determines whether to mix at intervals of set time in crank rotation
Air is entered, and in the case where being judged to being mixed into air, has made during the driving time shorter than the stipulated time described
Pressure reducing valve is open.
2. common rail fuel injection device as described in claim 1, wherein
The stipulated time is determined according to crank rotation speed.
3. common rail fuel injection device as described in claim 1, wherein
The driving time is determined according to crank rotation speed.
4. common rail fuel injection device as described in claim 1, wherein
The control unit is judged to being mixed into the case where the pressure obtained from the test section is less than the first specified value
The air.
5. common rail fuel injection device as claimed in claim 4, wherein
The control unit controls the aperture of the pressure reducing valve according to the pressure obtained from the test section.
6. common rail fuel injection device as claimed in claim 4, wherein
First specified value is determined according to the type of engine.
7. common rail fuel injection device as described in claim 1, wherein
The control unit obtains the pressure, and the change of the pressure within the stipulated time every the stipulated time
In the case that change amount is less than the second specified value, it is judged to being mixed into the air.
8. common rail fuel injection device as claimed in claim 7, wherein
Second specified value is determined according to the type of engine.
9. common rail fuel injection device as claimed in claim 7, wherein
The control unit controls the aperture of the pressure reducing valve according to the variable quantity of the pressure.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017074631A JP6819425B2 (en) | 2017-04-04 | 2017-04-04 | Common rail fuel injection system |
| JP2017-074631 | 2017-04-04 | ||
| PCT/JP2018/014092 WO2018186345A1 (en) | 2017-04-04 | 2018-04-02 | Common rail fuel injection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110462200A true CN110462200A (en) | 2019-11-15 |
| CN110462200B CN110462200B (en) | 2021-08-10 |
Family
ID=63713037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880019394.1A Active CN110462200B (en) | 2017-04-04 | 2018-04-02 | Common rail type fuel injection device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6819425B2 (en) |
| CN (1) | CN110462200B (en) |
| PH (1) | PH12019502196A1 (en) |
| WO (1) | WO2018186345A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109578159A (en) * | 2018-11-27 | 2019-04-05 | 潍柴动力股份有限公司 | A kind of large-diameter electric-control motor establishes the method and device of rail pressure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004144037A (en) * | 2002-10-25 | 2004-05-20 | Bosch Automotive Systems Corp | Operation control method of high pressure pump for common rail |
| EP2116711A1 (en) * | 2008-05-08 | 2009-11-11 | Toyota Jidosha Kabushiki Kaisha | Malfunction diagnostic device and malfunction diagnostic method for fuel system |
| CN101910612A (en) * | 2007-12-28 | 2010-12-08 | 博世株式会社 | Fuel supply device for internal combustion engine and control device for fuel supply device |
| CN102374054A (en) * | 2010-08-18 | 2012-03-14 | 株式会社电装 | Controller for pressure reducing valve |
| CN105229293A (en) * | 2013-06-28 | 2016-01-06 | 五十铃自动车株式会社 | The control gear of common rail fuel injection device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3829573B2 (en) * | 2000-03-14 | 2006-10-04 | いすゞ自動車株式会社 | Common rail fuel injection system |
| JP2006022677A (en) * | 2004-07-06 | 2006-01-26 | Nissan Motor Co Ltd | Fuel system control device for internal combustion engine |
| JP4544153B2 (en) * | 2005-12-27 | 2010-09-15 | 株式会社デンソー | Fuel injection control device |
| JP4525793B2 (en) * | 2008-05-08 | 2010-08-18 | トヨタ自動車株式会社 | Abnormality diagnosis apparatus and abnormality diagnosis method for fuel system |
-
2017
- 2017-04-04 JP JP2017074631A patent/JP6819425B2/en active Active
-
2018
- 2018-04-02 WO PCT/JP2018/014092 patent/WO2018186345A1/en active Application Filing
- 2018-04-02 CN CN201880019394.1A patent/CN110462200B/en active Active
-
2019
- 2019-09-24 PH PH12019502196A patent/PH12019502196A1/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004144037A (en) * | 2002-10-25 | 2004-05-20 | Bosch Automotive Systems Corp | Operation control method of high pressure pump for common rail |
| CN101910612A (en) * | 2007-12-28 | 2010-12-08 | 博世株式会社 | Fuel supply device for internal combustion engine and control device for fuel supply device |
| EP2116711A1 (en) * | 2008-05-08 | 2009-11-11 | Toyota Jidosha Kabushiki Kaisha | Malfunction diagnostic device and malfunction diagnostic method for fuel system |
| CN102374054A (en) * | 2010-08-18 | 2012-03-14 | 株式会社电装 | Controller for pressure reducing valve |
| CN105229293A (en) * | 2013-06-28 | 2016-01-06 | 五十铃自动车株式会社 | The control gear of common rail fuel injection device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6819425B2 (en) | 2021-01-27 |
| PH12019502196A1 (en) | 2020-06-08 |
| WO2018186345A1 (en) | 2018-10-11 |
| CN110462200B (en) | 2021-08-10 |
| JP2018178754A (en) | 2018-11-15 |
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