CN103306839A - Control method and control system for rail pressure of common rail - Google Patents
Control method and control system for rail pressure of common rail Download PDFInfo
- Publication number
- CN103306839A CN103306839A CN2013102721490A CN201310272149A CN103306839A CN 103306839 A CN103306839 A CN 103306839A CN 2013102721490 A CN2013102721490 A CN 2013102721490A CN 201310272149 A CN201310272149 A CN 201310272149A CN 103306839 A CN103306839 A CN 103306839A
- Authority
- CN
- China
- Prior art keywords
- rail pressure
- oil
- oil mass
- injection
- spray
- 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
Links
Images
Landscapes
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a control method and a control system for rail pressure of a common rail. The control method comprises the following steps: acquiring the working condition of an engine when the oil amount changes; when the variable quantity of the oil mass reduction exceeds a preset range, continuously injecting oil according to the fuel-injection quantity before the variable quantity of the oil mass reduction exceeds the preset range, and forcibly opening a post injection; when the injection time reaches the preset range, injecting the oil according to the actual oil mass needed by the engine and closing the post injection. According to the control method, the oil mass is locked, and the post injection is opened, so that the time for the actual rail pressure to be reduced to the set rail pressure is shortened; in addition, only less oil generates torque when the post injection is opened, and basically, the normal control of the engine is not disturbed.
Description
Technical field
The present invention relates to the engine control technical field, particularly a kind of controlling method and the control system of rail rail pressure altogether.
Background technique
Motor is the device that a kind of chemical energy with fuel oil changes into mechanical energy, and the burning of fuel oil need mix according to certain ratio with air, and the supply of fuel oil is undertaken by oil sprayer.For Abgasgesetz and the accurate control of satisfying country, the high-pressure common rail technology is adopted in the fuel-flow control of motor, and the Electrocontrolled high-pressure common rail system mainly comprises Electrocontrolled high-pressure oil pump, common rail pipe, electric-controlled fuel injector and four parts of ECU.Thereby the Electrocontrolled high-pressure oil pump can utilize the pressure in the fuel gauging unit controls pump oil flow control common rail pipe, satisfying the oil spout of electric-controlled fuel injector, thereby adapts to the operating mode of motor.Electric-controlled fuel injector can be controlled injection advance angle and fuel injection quantity neatly according to the operating mode of reality.
At present, the injection of electric-controlled fuel injector generally is divided into spray after 3 pre-sprays, 1 main jet and 2 times in the high pressure co-rail system.Pre-spray is mainly used in cold start-up or running on the lower load, and the back spray is mainly used in removing particle or improves SCR system exhaust temperature.So pre-spray and back spray are not generally adopted, and only carry out in having the special operation condition of the demand, in the general engine operation process, mainly carry out main jet.In addition, at above-mentioned several spray regimes, 3 pre-sprays, 1 main jet can produce moment of torsion, can produce moment of torsion near the small part oil mass in the spray after 1 time of main jet, and the remaining part oil mass only produces heat and do not produce moment of torsion.
When the oil mass rapid drawdown of engine demand, control unit can be exported and reduce the instructing to the Electrocontrolled high-pressure oil pump of oil mass supply, but there is certain operating lag in the Electrocontrolled high-pressure oil pump, in this section retard time, fuel injection quantity occurs and reduce, and fuel delivery still keeps higher phenomenon, this causes the actual rail pressure of rail pressure pipe abnormal ascending (the paddy peak among Fig. 2) can occur, differ greatly with setting rail pressure, influence the normal use of motor.
For this reason, please refer to Fig. 1 and Fig. 2, Fig. 1 is the FB(flow block) of a kind of typical rail rail pressure altogether control; Fig. 2 is the effect comparison plotted curve before and after the rail pressure control.Fig. 2 draws rail pressure and rises sharply under the operating mode, controls the effect of rail pressure by mode among Fig. 1.Rail pressure change curve, B when wherein A represents not carry out rail pressure control represents to carry out rail pressure change curve after the rail pressure control according to Fig. 1 mode.The a segment table shows not bust plateau before of oil mass, and the b segment table shows the state after the oil mass locking, and the c segment table shows the state after the oil mass locking resets.
In the engine working process, the oil mass that can detect motor in real time changes (oil mass that namely produces moment of torsion changes), when changing excessive (transition point of a section and b section), fuel injection quantity before control unit can lock and change, according to this fuel injection quantity sustained firing certain hour, namely continue the oil mass demand main jet certain hour according to before.After injection a period of time (end of b section), rail pressure decline certain value, at this moment, oil mass locks reset (the c section begins), carry out fuel injection quantity control according to normal oil mass injection program, the of short duration rising of rail pressure meeting, certainly, rail pressure relatively before, no longer rise sharply, drop to the setting rail pressure then gradually, to satisfy the actual oil mass demand of motor, the operational order of response driver.
Yet there is following technical problem in such scheme:
One, according to the fuel injection quantity sustained firing some cycles before changing, this difference of spraying oil mass and oil pump pump oil oil mass is less, and this difference reduces rail pressure needs the time longer, in the actual mechanical process, need the sustained firing long period, therefore, the rail pressure rate of descent is still slow partially;
Two, when the oil mass rapid drawdown of engine demand, spray according to former fuel injection quantity and spray regime, because it is longer to reduce the rail pressure time, produce the time lengthening of unnecessary moment of torsion, influence the response performance of motor.
In view of this, how when motor oil mass decline variable quantity is excessive, quickly actual rail pressure being adjusted to the setting rail pressure, is the technical problem that those skilled in the art need to be resolved hurrily.
Summary of the invention
For solving the problems of the technologies described above, purpose of the present invention is for providing a kind of controlling method and the control system of rail rail pressure altogether, and this controlling method and control system can be adjusted to the setting rail pressure with actual rail pressure quickly.
The controlling method of rail rail pressure altogether provided by the invention comprises the steps:
Obtain engine oil quantitative change chemical industry condition;
When oil mass decline variable quantity exceeds preset range, exceed preset range fuel injection quantity before according to the oil mass variation and continue to spray, and spray behind the enforced opening;
After spraying the scheduled time, according to required injection of the actual oil mass of motor, and close the back spray.
In the time of this controlling method locking oil mass, also open the back spray, rail pressure control scheme compared to background technique, total oil mass that the unlatching of back spray makes oil sprayer spray in the unit time increases, and the variation unanimity of oil pump feed amount, make that it is faster that actual rail pressure descended in the identical time during " oil mass lock state ", it is shorter perhaps to reach the used time of same decline effect.So, oil mass latch-release and resetting, actual rail pressure finally drops to the time of setting rail pressure and is reduced.
And, the back spray has only the fraction oil mass can produce moment of torsion at most, under the situation of not disturbing motor normally to control substantially, avoided rail pressure to rise sharply, and accelerated rail pressure and dropped to the process of setting rail pressure, also just correspondingly shortened the time that unnecessary moment of torsion exists, responded rapidly and control instruction to what motor was made.
Preferably,
Only enforced opening does not produce the back spray of moment of torsion.
Preferably,
According to setting rail pressure and actual rail pressure, precompute the scheduled time of injection; When oil mass decline variable quantity exceeds preset range, according to current actual rail pressure, set the corresponding scheduled time of rail pressure and spray.
Preferably,
The periodicity of the scheduled time for spraying.
Preferably,
The described scheduled time is definite value.
The present invention also provides a kind of control system of rail rail pressure altogether, comprise oil pump, main jet oil sprayer, back injection injector and controller, it is characterized in that, described monitoring control devices engine oil quantitative change chemical industry condition, when oil mass decline variation exceeds preset range, described controller outputs control signals to described main jet oil sprayer, make it change the fuel injection quantity exceed before the preset range according to oil mass and continue to spray, and control back injection injector is opened;
After spraying Preset Time, the described back of described controller control injection injector is closed, and outputs control signals to described main jet oil sprayer, makes it according to required injection of the actual oil mass of motor.
The control system that provides is consistent with the controlling method principle, has the technique effect identical with controlling method.
Preferably, described controller is only opened the back injection injector that does not produce moment of torsion.
Preferably, prestore in the described controller according to the scheduled time of setting the injection that rail pressure and actual rail pressure precompute; When oil mass decline variable quantity exceeded preset range, described controller was controlled described main jet oil sprayer and is sprayed according to the scheduled time corresponding with current actual rail pressure, setting rail pressure.
Preferably, the periodicity of the desire line time that prestores in the described controller for spraying.
Preferably, the scheduled time that prestores in the described controller is definite value.
Description of drawings
Fig. 1 is the FB(flow block) of a kind of typical rail rail pressure altogether control;
Fig. 2 is the effect comparison plotted curve before and after the rail pressure control;
Fig. 3 is rail rail pressure controlling method first embodiment's flow chart altogether provided by the present invention;
Fig. 4 is the comparison plotted curve that rail pressure changes under three kinds of patterns.
Embodiment
In order to make those skilled in the art understand technological scheme of the present invention better, the present invention is described in further detail below in conjunction with the drawings and specific embodiments.Describe for ease of understanding with succinct, hereinafter in conjunction with rail rail pressure controlling method and control system argumentation altogether, beneficial effect no longer repeats to discuss.
Please refer to Fig. 3, Fig. 3 is rail rail pressure controlling method first embodiment's flow chart altogether provided by the present invention.
The controlling method of the common rail rail pressure among this embodiment comprises the steps:
S1, obtain engine oil quantitative change chemical industry condition;
The engine oil quantitative changeization can detect acquisition, when parameters such as throttle, engine speed change, can detect the actual required oil mass of corresponding motor and change, and this changing value can directly obtain from existing detection data.Altogether rail rail pressure control system comprises oil pump, controller (ECU), oil sprayer, wherein, oil sprayer comprise can spray in advance, several oil sprayers of main jet and back spray, but function reference background technology department divides and understands separately.Controller control oil pump and oil sprayer, and controller can obtain the data of engine oil quantitative changeization.
Whether S2, oil amount determination decline variable quantity exceed preset range, are, then enter step S3, not, then return step S1;
The required oil mass decline variable quantity of motor is in certain scope usually, namely under a certain stable operation pattern, engine oil amount variance ratio should be in the preset range, and this preset range can be set up by conventional test or analog simulation, and this prespecified range can be stored in the controller.When engine oil amount variable quantity exceeds preset range, be rapid drawdown or the operating mode that rises sharply, namely change has taken place in engine mode, during such as running automobile, tramples throttle, and this moment, engine oil amount variable quantity can cataclysm.
S3, change the fuel injection quantity exceed before the preset range according to oil mass and continue to spray, and spray behind the enforced opening;
Described as can be known by background technique, under the general operating mode of motor, adopt main jet.Under the nominal situation, when the motor oil mass descended, the main jet oil sprayer can make an immediate response to reduce fuel injection quantity.But among this embodiment, when the rapid drawdown of motor oil mass, controller can output control signals to the main jet oil sprayer, makes it keep the preceding fuel injection quantity of rapid drawdown constant, namely locks the preceding oil mass of rapid drawdown.Simultaneously, injection injector behind the controller output control signal enforced opening, then the back injection injector, also can be opened by control when the oil mass rapid drawdown except removing particle and improving the SCR system exhaust temperature.
S4, spray the scheduled time after, according to required injection of the actual oil mass of motor, and close the back and spray.
After spraying the scheduled time, rail pressure decline certain value, at this moment, the locking of controller control oil mass resets, and according to the control program control main jet oil sprayer injection of routine, until dropping to the setting rail pressure, with the operational order of response to motor, closes the back spray simultaneously.
Can understand the beneficial effect of this programme in conjunction with Fig. 4, Fig. 4 is the comparison plotted curve that rail pressure changes under three kinds of patterns, the change curve under three kinds of patterns be respectively when not carrying out rail pressure control rail pressure change curve A, according to the mode of background technique carry out after the rail pressure control rail pressure change curve B, carry out rail pressure change curve C after the rail pressure control according to the embodiment of the invention.Wherein, a segment table shows not bust plateau before of oil mass, and the b segment table shows the state after the oil mass locking, and the c segment table shows the state after the oil mass locking resets.
In the present embodiment, in the time of the locking oil mass, also open the back spray, compared to the rail pressure control scheme of background technique, total oil mass that the unlatching of back spray makes oil sprayer spray in the unit time increases, and the variation unanimity of oil pump feed amount, so the method for present embodiment makes during " oil mass lock state ", it is faster that actual rail pressure descended in the identical time, can understand with reference to B, the C curve section of b section correspondence among the figure 4, and it is shorter perhaps to reach the used time of same decline effect.So, oil mass latch-release and resetting, actual rail pressure finally drops to the time of setting rail pressure and is reduced.
And, the back spray has only the fraction oil mass can produce moment of torsion at most, under the situation of not disturbing motor normally to control substantially, avoided rail pressure to rise sharply, and accelerated rail pressure and dropped to the process of setting rail pressure, also just correspondingly shortened the time that unnecessary moment of torsion exists, responded rapidly and control instruction to what motor was made.
Accordingly, optimized technological scheme is, during the rapid drawdown of engine oil amount variable quantity, only enforced opening does not produce the back spray of moment of torsion, and namely controller is only opened the back injection injector that does not produce moment of torsion.The back spray that does not produce moment of torsion obviously when producing above-mentioned technique effect, can not cause any interference to normally controlling of motor.As described in the background section, the back injection injector of close main jet oil sprayer may produce small torque, and does not produce moment of torsion away from the back injection injector of main jet oil sprayer, but the enforced opening latter.
Set rail pressure and determined by parameters such as the throttle of motor, rotating speeds, after the current working of motor was determined, it was set rail pressure and is relatively also determined, when namely the actual rail pressure of rail reaches this setting rail pressure altogether, can satisfy current motor oil mass demand.Certainly in the practical operation, allow actual rail pressure and setting rail pressure to have rational deviation.
Injection among the step S3 need be kept the scheduled time, and this time can calculate, and be stored in the controller in advance according to setting rail pressure and actual rail pressure.When oil mass decline variable quantity exceeded preset range, controller can be controlled the main jet oil sprayer and spray according to the scheduled time corresponding with current actual rail pressure, setting rail pressure.
As shown in Figure 4, according to actual rail pressure and the setting rail pressure of correspondence, the scheduled time needs to guarantee, after the scheduled time is sprayed in main jet and back spray, rail pressure can drop to certain value, and unlocks on this value basis and rail pressure when rising by a small margin, and rail pressure still is in the range of normal value.So, the scheduled time is not definite value, can calculate according to setting rail pressure, actual rail pressure to obtain, specifically can be by verification experimental verification.At this moment, when the difference between actual rail pressure and the setting rail pressure was excessive, the scheduled time was corresponding longer, otherwise then shorter, in the control procedure, controller can obtain the corresponding scheduled time with the setting rail pressure according to current actual rail pressure and control with enforcement.
Certainly, it also is feasible calculating without precision, and scheduled time this moment can be definite value, and is pre-stored in the controller.Obtain an intermediate value as the scheduled time according to modes such as test or emulation, when spraying according to this scheduled time locking oil mass and after opening, can reduce rail pressure quickly, just under different actual rail pressures, setting rail pressure deviation, the predictability that reduces the rail pressure effect may be inferior to above-described embodiment.But the control of this step-down mode is more simple, generally sprays 1-2 injection cycle and gets final product.
Generally, oil sprayer sprays for intermittent type sprays, and namely behind the sustained firing certain hour, rests the certain hour section, continues injection, from injection beginning to the time period of injection beginning is an injection cycle next time.At this kind spray regime, the above-mentioned scheduled time that controller prestores can be the periodicity that sprays, and control main jet oil sprayer and back injection injector finish according to this periodicity injection can execution in step S4.So design more meets present oil sprayer mode of operation.
More than controlling method and the control system of a kind of altogether rail rail pressure provided by the present invention is described in detail.Used specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (10)
1. a controlling method that is total to the rail rail pressure is characterized in that, comprises the steps:
Obtain engine oil quantitative change chemical industry condition;
When oil mass decline variable quantity exceeds preset range, exceed preset range fuel injection quantity before according to the oil mass variation and continue to spray, and spray behind the enforced opening;
After spraying the scheduled time, according to required injection of the actual oil mass of motor, and close the back spray.
2. controlling method as claimed in claim 1 is characterized in that,
Only enforced opening does not produce the back spray of moment of torsion.
3. controlling method as claimed in claim 1 or 2 is characterized in that, according to setting rail pressure and actual rail pressure, precomputes the scheduled time of injection; When oil mass decline variable quantity exceeds preset range, according to current actual rail pressure, set the corresponding scheduled time of rail pressure and spray.
4. controlling method as claimed in claim 3 is characterized in that, the periodicity of the scheduled time for spraying.
5. controlling method as claimed in claim 1 or 2 is characterized in that, the described scheduled time is definite value.
6. control system of rail rail pressure altogether, comprise oil pump, main jet oil sprayer, back injection injector and controller, it is characterized in that, described monitoring control devices engine oil quantitative change chemical industry condition, when oil mass decline variation exceeds preset range, described controller outputs control signals to described main jet oil sprayer, make it change the fuel injection quantity exceed before the preset range according to oil mass and continue to spray, and control back injection injector is opened;
After spraying Preset Time, the described back of described controller control injection injector is closed, and outputs control signals to described main jet oil sprayer, makes it according to required injection of the actual oil mass of motor.
7. control system as claimed in claim 6 is characterized in that, described controller is only opened the back injection injector that does not produce moment of torsion.
8. as claim 6 or 7 described control system, it is characterized in that, prestore in the described controller according to the scheduled time of setting the injection that rail pressure and actual rail pressure precompute; When oil mass decline variable quantity exceeded preset range, described controller was controlled described main jet oil sprayer and is sprayed according to the scheduled time corresponding with current actual rail pressure, setting rail pressure.
9. control system as claimed in claim 8 is characterized in that, the periodicity of the desire line time that prestores in the described controller for spraying.
10. as claim 6 or 7 described control system, it is characterized in that the scheduled time that prestores in the described controller is definite value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310272149.0A CN103306839B (en) | 2013-07-01 | 2013-07-01 | The controlling method of rail pressure of common rail and control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310272149.0A CN103306839B (en) | 2013-07-01 | 2013-07-01 | The controlling method of rail pressure of common rail and control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103306839A true CN103306839A (en) | 2013-09-18 |
| CN103306839B CN103306839B (en) | 2015-09-09 |
Family
ID=49132465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310272149.0A Active CN103306839B (en) | 2013-07-01 | 2013-07-01 | The controlling method of rail pressure of common rail and control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103306839B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526918A (en) * | 2022-02-21 | 2022-05-24 | 中国第一汽车股份有限公司 | Rail pressure control system, method and device for thermodynamic development and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000073815A (en) * | 1998-08-27 | 2000-03-07 | Toyota Motor Corp | Fuel injection control device |
| CN101397942A (en) * | 2007-09-25 | 2009-04-01 | Mtu腓特烈港有限责任公司 | Method for controlling and regulating internal combustion engine with common rail system |
| CN101984247A (en) * | 2010-11-04 | 2011-03-09 | 中国第一汽车集团公司 | Pressurizing common-rail oil injection system |
| US20120150419A1 (en) * | 2010-04-08 | 2012-06-14 | Ford Global Technologies, Llc | Fuel Injector Diagnostic for Dual Fuel Engine |
| US20130133243A1 (en) * | 2011-06-28 | 2013-05-30 | Basf Se | Quaternized nitrogen compounds and use thereof as additives in fuels and lubricants |
-
2013
- 2013-07-01 CN CN201310272149.0A patent/CN103306839B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000073815A (en) * | 1998-08-27 | 2000-03-07 | Toyota Motor Corp | Fuel injection control device |
| CN101397942A (en) * | 2007-09-25 | 2009-04-01 | Mtu腓特烈港有限责任公司 | Method for controlling and regulating internal combustion engine with common rail system |
| US20120150419A1 (en) * | 2010-04-08 | 2012-06-14 | Ford Global Technologies, Llc | Fuel Injector Diagnostic for Dual Fuel Engine |
| CN101984247A (en) * | 2010-11-04 | 2011-03-09 | 中国第一汽车集团公司 | Pressurizing common-rail oil injection system |
| US20130133243A1 (en) * | 2011-06-28 | 2013-05-30 | Basf Se | Quaternized nitrogen compounds and use thereof as additives in fuels and lubricants |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526918A (en) * | 2022-02-21 | 2022-05-24 | 中国第一汽车股份有限公司 | Rail pressure control system, method and device for thermodynamic development and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103306839B (en) | 2015-09-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100436794C (en) | Fuel injection control apparatus for internal combustion engine | |
| CN100523464C (en) | Fuel injection control apparatus designed to minimize combustion noise of engine | |
| CN101790632B (en) | Fuel injection control apparatus and fuel injection control method for internal combustion engine | |
| CN101581253B (en) | Fuel injection control device and fuel injection system with the same | |
| Han et al. | Numerical study on fuel physical effects on the split injection processes on a common rail injection system | |
| CN202250509U (en) | High pressure common-rail fuel system of diesel engine | |
| CN102312745A (en) | DENG and control the method for this DENG | |
| CN102454500A (en) | Control system of internal combustion engine | |
| CN101410609A (en) | Injection method and associated internal combustion engine | |
| CN102146851A (en) | Method for operating an injection system of an internal combustion engine | |
| EP2564048B1 (en) | Fuel injection rate shaping in an internal combustion engine | |
| CN104919163B (en) | For determining the method and apparatus of fuel mass and possessing the vehicle of the device | |
| CN103397963A (en) | Fast oil rail pressure decompression and control method and electronic control high-pressure common rail system | |
| CN102575609A (en) | Method for regulating the rail pressure in a common rail injection system of an internal combustion engine | |
| CN105051354A (en) | Device for controlling fuel injection valve | |
| EP3408530B1 (en) | Injection system, apparatus and method for controlling the quantity of fuel injected | |
| CN100370121C (en) | Control method and apparatus for diesel engine fuel injection system | |
| CN103352763A (en) | MAP curve correction method and device for fuel injector and engine fuel supply system | |
| CN104685191A (en) | Method for managing the amount of fuel injected into engine | |
| CN101730793A (en) | Method and device for determining a control parameter for a fuel injector of an internal combustion engine | |
| CN103306839A (en) | Control method and control system for rail pressure of common rail | |
| Buratti et al. | Di diesel engine with variable geometry turbocharger (VGT): a model based boost pressure control strategy | |
| CN108457761B (en) | Injection advance angle determines method and device | |
| CN110219723A (en) | A kind of SCR ejection control method, the apparatus and system of in-use automotive transformation | |
| CN103459813A (en) | Cetane number estimation device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |