CN101379486A - Cylinder to cylinder variation control - Google Patents
Cylinder to cylinder variation control Download PDFInfo
- Publication number
- CN101379486A CN101379486A CNA2006800531678A CN200680053167A CN101379486A CN 101379486 A CN101379486 A CN 101379486A CN A2006800531678 A CNA2006800531678 A CN A2006800531678A CN 200680053167 A CN200680053167 A CN 200680053167A CN 101379486 A CN101379486 A CN 101379486A
- Authority
- CN
- China
- Prior art keywords
- engine
- cylinder
- intake mixture
- exhaust gas
- prediction
- 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.)
- Pending
Links
Images
Abstract
Method and system for controlling cylinder to cylinder variations of undesirable emissions in exhaust gas of engines with exhaust gas recirculation. An engine model is used to predict the intake composition of the next cylinder firing based on the composition of the exhaust, as a function of time and applicable engine conditions. At least one engine parameter is adjusted to compensate for the predicted intake composition in order to minimize cylinder to cylinder variations.
Description
The present invention requires in the U.S. Provisional Patent Application sequence number No.60/753 of submission on Dec 21st, 2005, and 197 rights and interests are being incorporated herein by reference it.
Background
The present invention relates to electronic engine control.Some embodiment relate to the nitrogen oxides from exhaust gas of the turbodiesel with exhaust gas recirculation (turbodiesel) engine (oxide of nitrogen) and granular material discharged cylinder (cylinder) changed to cylinder and control.Other embodiment relate to other engines such as petrol engine.Control is based on periodic model, rather than (or in addition) is based on the circulation averaging model.
Reduce cylinder to cylinder and change the average output that will reduce oxides of nitrogen and particle, and will between fuel economy (fuel economy) and oxides of nitrogen and granular material discharged contradiction demand, obtain better to trade off.
The accompanying drawing summary
Fig. 1 is the curve map that illustrates from the real data of test engine.
Fig. 2 is the example of the diagrammatic sketch of engine exhaust-gas recirculating system.
Fig. 3 illustrates the initial conditions that can how to influence difference cylinder from the exhaust of a cylinder (exhaust).
Fig. 4 is the example of diagnostic flow chart.
Embodiment describes in detail
Though the present invention can allow various forms of embodiment, the disclosure be considered to example of the present invention and be not be intended to the present invention is defined in illustrated in or embodiment more shown in the drawings and described under the understanding of the specific embodiment described after this.
The reason that the cylinder to cylinder of engine emission changes is the asymmetric of combustion process between the cylinder.Usually be opened so that reduce the discharging of oxides of nitrogen for the exhaust gas recirculation passage that connects air inlet and exhaust manifold (manifold).In this case, the cylinder to cylinder variation can involve inlet manifold.According to the particular geometric and the engine operational conditions of exhaust gas recirculation path, manifold, this can cause the amplification that these cylinder to cylinder change.The result will be that the burning condition height in the Indivudual cylinder is asymmetric.Fig. 1 is the example that such cylinder to cylinder changes.It shows the real data from test engine, has drawn the signal and the time relation curve of the particle in the expression engine exhaust.Time between the peak value can change according to engine condition, and not necessarily consistent with circulation, is predictable but show as really.
Fig. 2 is the example of the synoptic diagram of engine exhaust-gas recirculating system, and this system comprises enmgine exhaust 21, heat interchange 22, comprises the turbosupercharger and the exhaust gas recirculation valve 25 of turbine 23 and compressor 24.This only is an example of low pressure egr system.The present invention is equally applicable to have the engine of the other system system such as high pressure exhaust gas recirculating system, no turbosupercharger etc.
Fig. 3 illustrates and is being in the expression of the difference cylinder of round-robin different phase preset time arbitrarily, and shows the initial conditions that can influence difference cylinder from the exhaust gas recirculation of a cylinder.For example, under specific engine geometry and specific speed and load, know from experience the air inlet that preferentially (preferentially) influence cylinder 3 from the recirculating gas of cylinder 1, still under different speed and load, can preferentially influence the air inlet of cylinder 2 and 3, or the like.The exhaust that is subjected to the cylinder of preferential influence will be followed the air inlet that preferentially influences some cylinder, or the like.
The present invention uses one group of sensor in intake and exhaust system, preferably have about 10 kilo hertzs sample frequency.For example, can measure particle by monitoring electric charge.For example, charge sensor can build on automobile (automotive) spark plug.Referring to U.S. Patent No. 6971258, it is incorporated herein by reference at this.These are the examples that are used to detect the device of particle.The sensor that is used to measure oxides of nitrogen is well known in the art.Such sensor can also be based upon on the spark plug so that be installed in the engine.These are the examples that are used to detect the device of oxides of nitrogen.
These signal of sensor can provide high-resolution real time monitoring for single cylinder, and cylinder to cylinder can be changed with since those variations that change produced of slow drift (slow drift), ground unrest and engine operational conditions make a distinction.Described cylinder to cylinder variation can be extracted for further processing.
The oxides of nitrogen in the engine cycles (being two revolutions for Otto cycle engine) and the overview (profile) of particle can characterize by one group of variable that changes that fully expresses possibility.For example, those variablees can comprise potpourri (concentration that comprises oxides of nitrogen and particle), temperature, pressure and flow, and it can comprise the timing of engine, percent of exhaust gas recirculation, valve position and other engine informations.
Control algolithm can be carried out the adaptability feedforward control to exhaust gas recirculation so that the cylinder to cylinder minimize variations by means of exhaust gas recirculation valve, the fuel mixture that is sprayed and injection timing (injection timing), to obtain the consistent as far as possible overview of an oxides of nitrogen in the circulation and particle.That is to say that be different from the independent control to independent variable, and be different from direct feedforward control, described control algolithm should be adjusted the initial conditions of cylinder according to the anticipated impact of EGR gas.For specific speed and load, the exhaust of the given cylinder of dynamic engine model prediction is to the influence of each cylinder intake.For example, these can be subjected to import stroke during the influence of the relevant manifold capacity of air inflow.In addition, the timing and the EGR gas of the EGR gas influence degree of propagating (stir) fully can change along with engine geometry and engine condition.Sensor is in cylinder one by one and the concentration of indication oxides of nitrogen and particle on the round-robin basis one by one.Engine mockup should be predicted the cylinder intake that will be subjected to the EGR gas influence simultaneously, and adjusts so that the cylinder to cylinder minimize variations.Sensor in the gas handling system can be provided for measuring the data of the actual initial conditions of cylinder igniting.If the accurately influence of prediction exhaust gas recirculation on the basis of cylinder one by one then can not adjusted engine mockup.
Emission control systems for example can comprise sensor, engine mockup and control unit of engine, described control unit of engine be suitable for handling signal from sensor, with engine data be applied to engine mockup, adjust engine parameter, whether detect the cylinder intake potpourri consistent with the intake mixture of its prediction, if and the intake mixture of cylinder intake potpourri and its prediction is inconsistent, then engine mockup is adjusted.These are devices of being used to predict the intake mixture of next cylinder igniting, be used to adjust at least one engine parameter come intake mixture to prediction to compensate in case make particle and oxides of nitrogen cylinder to cylinder discharging minimize variations device, be used to detect the whether consistent device of actual intake mixture and the example of the device that is used for the intake mixture prediction unit is adjusted with the intake mixture of prediction.
The problem that minimizes the cylinder to cylinder variation can be used as periodic multiple-input and multiple-output minimum variance control problem and handle.Described control algolithm is used the semiempirical model by the process that combination obtained of mathematical modeling and experiment.Specific feature can be dependent on specific engines, for example how much of exhaust gas recirculation passage and manifold.Must there be enough resolution to catch may change in the cycle profile.Can there be input and the variable parameter different with variable parameter, and they are treated as measured interference (air-distributor pressure, exhaust gas temperature etc.) with operated input.This is the example of device that is used to predict the intake mixture of next cylinder igniting.
Fig. 4 is the example of diagnostic flow chart.In this example, sensor monitoring (41) particle and oxides of nitrogen.The data that obtain from sensor relevant with engine speed, engine loading and exhaust gas recirculation rate (42).This virtual condition and the engine mockup of variable compared (43) predict the intake mixture that is used for next cylinder igniting as the function of time.If desired, the parameter such as fuel mixture, injection timing and/or exhaust gas recirculation rate is adjusted (44) so that the intake mixture that is used for next cylinder igniting is compensated.Whether in the example of Fig. 2, it is consistent with the engine mockup of prediction then to exist an inquiry (45) to detect the initial conditions of the cylinder of being discerned.If they are inconsistent, then engine mockup is adjusted (46).
In certain embodiments, can will concentrate on to control oxides of nitrogen, especially concentrate on and be changed to cost with the discharging of the cylinder to cylinder of particle and the cylinder to cylinder discharging of oxides of nitrogen is changed control.For example, no matter the aftertreatment such as filtrator (after-treatment) can be used to control particle and the variation of cylinder to cylinder discharging.Using posttreatment filter to control particle is common configuration in the North America.In some other embodiment, can will concentrate on to control particle, especially concentrate on and be changed to cost with the discharging of the cylinder to cylinder of oxides of nitrogen and the cylinder to cylinder discharging of particle is changed control.For example, no matter the nitrogen oxide trap such as SCR drip catcher (trap) can be used at downstream control oxides of nitrogen and the variation of cylinder to cylinder discharging.The use of downstream nitrogen oxide trap is a common configuration in Europe.In a further embodiment, can these two the variation of cylinder to cylinder discharging of particle and oxides of nitrogen will be concentrated on to control.
Except that the mean value emission control, cylinder to cylinder changes control and is used.The mean value emission control makes that changing (crossing over some circulations) more slowly minimizes and use the averaging model that more simply circulates.
According to above description, can find out and under the situation of true spirit that does not depart from novel concept of the present invention and scope, to carry out various modifications and variations.Should be understood that, be not intended to about specific embodiment shown or that describe and limit or infer restriction from it.
Claims (20)
1. one kind is used for method that the engine emission of engine with exhaust gas recirculation is controlled, and described method comprises:
Particle concentration in the monitor engine waste gas and at least one in the nitrous oxides concentration in the engine exhaust;
By at least one engine parameter is adjusted so that the minimize variations of the cylinder to cylinder of at least one in particle and oxides of nitrogen discharging come the intake mixture of the prediction of next cylinder igniting of being used for engine is compensated.
2. the method for claim 1 further comprises:
Predict the intake mixture that is used for next cylinder igniting according to engine mockup and set of variables;
Described set of variables comprises the concentration that at least one monitors.
3. method as claimed in claim 2 further comprises:
Whether detection is used for the intake mixture of cylinder igniting consistent with the intake mixture of the prediction that is used for described cylinder igniting;
If the intake mixture of intake mixture and prediction is inconsistent then engine mockup is adjusted.
4. method as claimed in claim 2, wherein said engine mockup partly depends on the fixed attribute of engine at least.
5. method as claimed in claim 4, wherein the stationary engine attribute comprises at least one how much in the exhaust gas recirculation passage of the manifold of engine and engine.
6. method as claimed in claim 2, wherein engine mockup prediction is from the influence to the intake mixture of each cylinder of engine of the waste gas of the single cylinder of engine, and it is as the function of time, engine speed and engine loading.
7. method as claimed in claim 2, described set of variables also comprises at least one in the group that is made of the following: temperature, exhaust gas temperature, pressure, air-distributor pressure, stream indication, the indication of fuel stream, timing of engine indication, percent of exhaust gas recirculation, exhaust gas recirculation rate, valve position, engine speed and engine loading.
8. the method for claim 1, described at least one engine parameter comprises at least one in the group that is made of the following: the fuel mixture that is sprayed, injection timing and exhaust gas recirculation rate.
9. the method for claim 1, the temporal resolution of monitoring step be high enough to cylinder to cylinder change with since the variation that change produced of slow drift, ground unrest and engine operational conditions make a distinction.
10. one kind is used for system that the engine emission of engine with exhaust gas recirculation is controlled, and described system comprises:
At least one sensor is used for the particle of detection of engine waste gas and at least one in the oxides of nitrogen;
Engine mockup is used to predict that it is as the function of time, engine speed and engine loading from the influence to the intake mixture of each cylinder of engine of the waste gas of the single cylinder of engine.
11. system as claimed in claim 10 also comprises control unit of engine, is used for adjusting at least one engine parameter so that the minimize variations of the cylinder to cylinder of at least one of particle and oxides of nitrogen discharging.
12. system as claimed in claim 10 also comprises:
Control unit of engine;
Described control unit of engine is suitable for handling the signal from described at least one sensor;
Described control unit of engine is suitable for engine data is applied to engine mockup to be used to predict the intake mixture of next the cylinder igniting that is used for engine, and described engine data comprises the data that obtain from described at least one sensor;
Described control unit of engine is suitable for adjusting at least one engine parameter and the intake mixture of prediction is compensated being used for, so that make at least one the minimize variations of cylinder to cylinder discharging in particle and the oxides of nitrogen.
13. system as claimed in claim 12, described engine data also comprises at least one in the group that is made of the following: temperature, exhaust gas temperature, pressure, air-distributor pressure, stream indication, the indication of fuel stream, timing of engine indication, percent of exhaust gas recirculation, exhaust gas recirculation rate, valve position, engine speed and engine loading.
14. system as claimed in claim 12, described at least one engine parameter comprises at least one in the group that is made of the following: the fuel mixture that is sprayed, injection timing and exhaust gas recirculation rate.
15. system as claimed in claim 10 also comprises:
Control unit of engine;
At least one sensor is used for the particle of gas handling system of detection of engine and at least one in the oxides of nitrogen;
Described control unit of engine is suitable for engine data is applied to engine mockup to be used to predict the intake mixture of next the cylinder igniting that is used for engine, and described engine data comprises the data that obtain from described at least one Abgassensor;
Whether described control unit of engine is suitable for detecting the intake mixture that is used for the cylinder igniting consistent with the intake mixture of the prediction that is used for described cylinder igniting, and described intake mixture is to determine from the data that at least one gas handling system sensor obtains by use;
Described control unit of engine is suitable under the inconsistent situation of the intake mixture of intake mixture and prediction engine mockup being adjusted.
16. system as claimed in claim 10, wherein said engine mockup partly depends on the fixed attribute of engine at least.
17. system as claimed in claim 16, wherein the stationary engine attribute comprises at least one how much in the exhaust gas recirculation passage of the manifold of engine and engine.
18. the variation that change produced that system as claimed in claim 10, the temporal resolution of described at least one sensor are high enough to just cylinder to cylinder be changed with owing to slow drift, ground unrest and engine operational conditions makes a distinction.
19. one kind is used for system that the engine emission of engine with exhaust gas recirculation is controlled, described system comprises:
Be used for the particle of detection of engine waste gas and at least one the device in the oxides of nitrogen;
Be used to predict the device of the intake mixture of next the cylinder igniting that is used for engine;
Being used for adjusting at least one engine parameter compensates with the intake mixture to prediction so that make at least one the device of minimize variations of cylinder to cylinder discharging of particle and oxides of nitrogen.
20. system as claimed in claim 19 also comprises:
Be used to detect be used for cylinder igniting intake mixture whether with the consistent device of intake mixture of the prediction that is used for described cylinder igniting;
Be used for the device under the inconsistent situation of the intake mixture of intake mixture and prediction, the intake mixture prediction unit adjusted.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US75319705P | 2005-12-21 | 2005-12-21 | |
| US60/753,197 | 2005-12-21 | ||
| US11/612,211 | 2006-12-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101379486A true CN101379486A (en) | 2009-03-04 |
Family
ID=40422020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800531678A Pending CN101379486A (en) | 2005-12-21 | 2006-12-19 | Cylinder to cylinder variation control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101379486A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103282626A (en) * | 2010-12-22 | 2013-09-04 | 雷诺股份公司 | System and method for controlling an internal combustion engine for a motor vehicle in transit |
-
2006
- 2006-12-19 CN CNA2006800531678A patent/CN101379486A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103282626A (en) * | 2010-12-22 | 2013-09-04 | 雷诺股份公司 | System and method for controlling an internal combustion engine for a motor vehicle in transit |
| CN103282626B (en) * | 2010-12-22 | 2016-05-04 | 雷诺股份公司 | For the system and method for motor vehicles explosive motor being controlled in transition state |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2607707C2 (en) | Exhaust gases recirculation system diagnostic technique (versions) and exhaust gases recirculation system | |
| Guardiola et al. | Cycle by cycle NOx model for diesel engine control | |
| US7447587B2 (en) | Cylinder to cylinder variation control | |
| US9765725B2 (en) | Method of operating an internal combustion engine | |
| US8266947B2 (en) | Cetane number estimating apparatus and method | |
| JP2013108489A (en) | NOx CONTROL SYSTEM AND METHOD | |
| CN103018051A (en) | Method and system for simulating various engine operating conditions to evaluate engine emissions test equipment | |
| US8170776B2 (en) | Method and device for controlling an internal combustion engine | |
| US6598470B2 (en) | Method for the testing of an exhaust gas recirculation system | |
| US10344703B2 (en) | Injector delivery measurement with leakage correction | |
| RU2560091C2 (en) | Test method of functionality of exhaust gas recirculation valve of internal combustion engine | |
| Spessa et al. | Steady-State and Transient Operations of a Euro VI 3.0 L HD Diesel Engine with Innovative Model-Based and Pressure-Based Combustion Control Techniques | |
| Chung et al. | Reduction of transient NOx emissions based on set-point adaptation of real-time combustion control for light-duty diesel engines | |
| CN101379486A (en) | Cylinder to cylinder variation control | |
| US20120303240A1 (en) | Method for operating an internal combustion engine | |
| US8315782B2 (en) | Method and device for operating an internal combustion engine | |
| US9624866B2 (en) | Method of estimating the injection pressure of an internal combustion engine | |
| US20140014081A1 (en) | Diagnosis Method And Device For Operating An Internal Combustion Engine | |
| KR20140010327A (en) | Method and system for performing selective engine parameter analysis | |
| KR20030007391A (en) | Method for operating an internal combustion engine in particular in a motor vehicle | |
| US20070131201A1 (en) | Method and device for monitoring a pulse charging valve of an internal combustion engine | |
| US20180313292A1 (en) | Control apparatus for an internal combustion engine | |
| CN107448312B (en) | Control device for internal combustion engine | |
| JP4382851B2 (en) | Control method and control apparatus for internal combustion engine | |
| US9551263B2 (en) | Method and device for operating an internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090304 |