CN103422957A - System amd method for controlling an after-treatment component of a compression-ignition engine - Google Patents
System amd method for controlling an after-treatment component of a compression-ignition engine Download PDFInfo
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- CN103422957A CN103422957A CN2013101765383A CN201310176538A CN103422957A CN 103422957 A CN103422957 A CN 103422957A CN 2013101765383 A CN2013101765383 A CN 2013101765383A CN 201310176538 A CN201310176538 A CN 201310176538A CN 103422957 A CN103422957 A CN 103422957A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/005—Electrical control of exhaust gas treating apparatus using models instead of sensors to determine operating characteristics of exhaust systems, e.g. calculating catalyst temperature instead of measuring it directly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/12—Parameters used for exhaust control or diagnosing said parameters being related to the vehicle exterior
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1606—Particle filter loading or soot amount
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention relates to a system and method for controlling an after-treatment component of a compression-ignition engine. A method for controlling regeneration within an after-treatment component of an engine includes receiving a signal that is responsive to a change in pressure across an after-treatment component and calculating an estimate of accumulated particulate matter in the after-treatment component using a soot accumulation model calibrated to simulate operation of the engine at a reference condition. A soot model correction factor is based at least in part on an environmental temperature correction and is applied to the estimate of accumulated particulate matter in the after-treatment component to produce a temperature-compensated estimate of accumulated particulate matter in the after-treatment component. The temperature-compensated estimate of accumulated particulate matter in the after-treatment component is compared to a predetermined threshold associated with the after-treatment component, and a remedial action is initiated when the temperature-compensated estimate of accumulated particulate matter in the after-treatment component exceeds the predetermined threshold.
Description
Technical field
The present invention relates to the after-treatment system of compression ignition engine, more particularly, relate to the system and method for the after-treatment components for controlling compression ignition engine.
Background technique
Due to environment reason, in the waste gas of compression ignition engine, the discharge of particulate matter is subject to control.Therefore, be equipped with the vehicle of compression ignition engine for example to generally include, for from its waste gas streams, (transforming, reduce and/or remove particulate matter and other controlled composition, nitrogen oxide or NOx) after-treatment components, for example, particulate filter, catalysis soot filters and absorbing catalyst.Particulate filter and other after-treatment components are effectively, but because they collect particulate matter, so also can increase counterpressure.
Particulate matter can comprise ash and the unburned carbon microsphere that is commonly referred to soot.Because this carbon back particulate matter accumulates in after-treatment components, it can increase the counterpressure in vent systems.Motor with large speed particulate loading discharge can relatively develop too high counterpressure level in cycle short-term, reduces engine efficiency and power and produces ability.Therefore, expectation has the micro particle filtering system that minimizes counterpressure, effectively traps the particulate matter in waste gas simultaneously.
For realizing this two challenging targets, must monitor termly after-treatment components, and the soot gathered by replacement parts or removal is safeguarded after-treatment components.The soot gathered from the after-treatment components cleaning can be by being oxidized to CO
2(that is, burning) realizes, is called in the art regeneration.For avoiding service disruption, regeneration is preferable over the replacing of after-treatment components usually.Cyclic regeneration catcher (CRT) is a kind of after-treatment components that traps the particle in waste gas streams and comprise the catalyzer that helps regeneration.
A kind of method that can realize regeneration is that the temperature by the particulate matter by filter material and/or collection is increased to the level over the combustion temperature of particulate matter.Improve temperature and promote the consumption of soot by the excessive oxygen oxidation particulate matter in permission waste gas.By particulate matter being exposed to the nitrogen dioxide (NO of sufficient concentration
2), at a lower temperature, particulate matter also can be oxidized, thereby be removed.The waste gas of compression engine (for example, diesel engine) contains NOx usually, and it mainly comprises nitrous oxide (NO) and percent 5 to 20 NO roughly
2, while in waste gas streams, having oxidation catalyst, NO
2Level generally higher.Therefore, the regeneration of some levels even occur in relatively low temperature.
Regenerative process can be passive or active.In passive system, for example, for example, whenever heat (, waste gas carries) and soot (, trapping in after-treatment components) while being enough to accelerating oxidation, and/or there is the NO that makes enough concentration that can oxidation at lower temperature in waste gas
2The time, all can regenerate.In active system, for example, by from external source (, electric heater, fuel burner, microwave applicator and/or from motor itself, for example directly spray into the injection of waste gas streams with later stage in-cylinder injection or fuel) introduce heat and cause regeneration in the expected time.Start initiative regeneration during multiple vehicle operating and exhaust situation.In these situations, favourable operational scenario is the stationary vehicle operation, for example, when vehicle stop, as the fueling parking period.Engine control system can be used to prediction and when initiatively promotes regeneration event and regenerative process is implemented to control to be favourable.
Engine control system can be used the soot model, by the characteristic of monitoring waste gas streams when waste gas streams flows through after-treatment components, infers the amount of soot of gathering in (, prediction) after-treatment components.Control system can be monitored time dependent soot load by the amount of soot data of inferring, to determine or to expect that it is necessary or expectation when regenerating, and to promote regeneration event, and/or implements the control to regenerative process or other remedial measure.In a kind of exemplary soot model, can utilize the pressure drop (that is, the reduction of pressure) of the after-treatment components both sides of loading, together with soot gather and pressure drop between the knowledge of relation, estimate the soot load of machinery systems in after-treatment components.This is possible, because along with soot gathers in after-treatment components, when pressure drop is usually clean from after-treatment components, the pressure drop of experience increases (in concrete temperature and volume flow rate).
The variation that has been found that engine operating temperature can cause the significant change of the amount of soot of carrying in engine efflux.This may be due to usually owing to the partial combustion temperature be a plurality of factors of compensation temperature to the control of motor.Therefore, but run into the problem of the soot model of attempting to produce the accurately predicting soot that motor is discharged on the certain environment temperature range.
Thereby expectation provides a kind of improved system and method for the after-treatment components of controlling compression ignition engine, for determining when, promotes initiative regeneration, and for the initiative regeneration of controlling the micro particle filtering system, have an improved model accuracy especially on the certain environment temperature range.
Summary of the invention
In exemplary embodiment of the present invention, comprise and receive the signal that the pressure in response to the after-treatment components both sides changes and use soot to gather model and calculate the estimated value that described after-treatment components is gathered particulate matter for the method for the regeneration of the after-treatment components of control engine, described soot gathers the operation that model is demarcated as simulation motor under base condition.The soot model tuning factor is proofreaied and correct based on ambient temperature at least in part, and is applied in after-treatment components gathering the described estimated value of particulate matter, to produce the estimated value of gathering the temperature correction of particulate matter in after-treatment components.Follow the predetermined threshold be associated with after-treatment components to make comparisons the temperature correction estimated value of gathering particulate matter in after-treatment components, and the temperature correction estimated value of gathering particulate matter in described after-treatment components start remedial measure while surpassing described predetermined threshold.
In another exemplary embodiment of the present invention, a kind of system for the regeneration in the after-treatment components of control engine comprises refresh controller, it is configured to reception in response to the signal of the pressure variation of after-treatment components both sides and uses soot to gather model and calculate the estimated value of gathering particulate matter in described after-treatment components, and described soot gathers model and is demarcated as the operation of simulated engine under base condition.Described refresh controller is configured to proofread and correct and determine the soot model tuning factor based on ambient temperature at least in part, and apply the described soot model tuning factor to the described estimated value of gathering particulate matter in described after-treatment components, to produce the temperature correction estimated value of gathering particulate matter in described after-treatment components.Described refresh controller follows the predetermined threshold be associated with described after-treatment components to make comparisons the temperature correction estimated value of gathering particulate matter in described after-treatment components, and the temperature correction estimated value of gathering particulate matter in described after-treatment components starts remedial measure while surpassing described predetermined threshold.
The invention provides following technological scheme:
1. the method for the regeneration of the after-treatment components of control engine comprises:
Reception is in response to the signal of the pressure variation of after-treatment components both sides;
Use soot to gather model and calculate the estimated value of gathering particulate matter in described after-treatment components, described soot gathers the operation that model is demarcated as simulation motor under base condition;
Proofread and correct and determine the soot model tuning factor based on ambient temperature at least in part;
The described estimated value of gathering particulate matter in described after-treatment components is applied the described soot model tuning factor, to produce the temperature correction estimated value of gathering particulate matter in described after-treatment components;
Follow the predetermined threshold be associated with described after-treatment components to make comparisons the temperature correction estimated value of gathering particulate matter in described after-treatment components; With
When surpassing described predetermined threshold, the temperature correction estimated value of gathering particulate matter in described after-treatment components starts remedial measure.
2. method as described as scheme 1, wherein said ambient temperature is proofreaied and correct based on intake air temperature signals.
3. method as described as scheme 1, wherein said ambient temperature is proofreaied and correct based on the gas-filling temperature signal.
4. method as described as scheme 1, wherein said ambient temperature is proofreaied and correct based on ambient temperature signal.
5. method as described as scheme 1, the wherein said soot model tuning factor is determined by interpolation between the soot model tuning factor being associated with various height above sea level, thereby is determined the appropriate soot model tuning at specific environment temperature correction and operation height above sea level place.
6. method as described as scheme 1, wherein said soot gathers the pressure drop index of model pressure decreased of waste gas streams when meaning waste gas streams through described after-treatment components.
7. method as described as scheme 6, wherein said pressure drop indication means the pressure ratio of described after-treatment components both sides.
8. method as described as scheme 1, wherein said soot gathers the flow rate index of the flow rate of model based on meaning described waste gas streams.
9. method as described as scheme 8, the speed of wherein said flow rate index based on described motor.
10. method as described as scheme 1, the relation between the pressure drop index that wherein said soot gathers model pressure decreased of waste gas streams when meaning waste gas streams through described after-treatment components and the flow rate index of the flow rate of the described waste gas streams of expression.
11. method as described as scheme 1, wherein start remedial measure and comprise the one or more control parameters of engine of adjusting, to revise the operation of described motor, thereby promotes the passive regeneration in described after-treatment components.
12. method as described as scheme 11, wherein said adjusting is configured to provide minimum temperature at described after-treatment components place, to promote the regeneration in described after-treatment components.
13. method as described as scheme 11, wherein said adjusting comprises fuel supply and the timing of revising described motor.
14. method as described as scheme 11, wherein said adjusting comprises the activation auxiliary heating element, to improve the temperature of described waste gas streams.
15. method as described as scheme 11, wherein said remedial measure comprises that activation is in order to indicate the operator to start the emergency warning lamp of the regeneration in described after-treatment components.
16. the system for the regeneration of the after-treatment components of control engine comprises:
Refresh controller, it has the processor that is attached to storage device, and described refresh controller is configured to:
Reception is in response to the signal of the pressure variation of after-treatment components both sides;
Use soot to gather model and calculate the estimated value of gathering particulate matter in described after-treatment components, described soot gathers the operation that model is demarcated as simulation motor under base condition;
Proofread and correct to determine the soot model tuning factor based on ambient temperature at least in part;
The described estimated value of gathering particulate matter in described after-treatment components is applied the described soot model tuning factor, to produce the temperature correction estimated value of gathering particulate matter in described after-treatment components;
Follow the predetermined threshold be associated with described after-treatment components to make comparisons the temperature correction estimated value of gathering particulate matter in described after-treatment components; With
When surpassing described predetermined threshold, the temperature correction estimated value of gathering particulate matter in described after-treatment components starts remedial measure.
17. system as described as scheme 16, wherein said ambient temperature is proofreaied and correct based on intake air temperature signals.
18. system as described as scheme 16, wherein said ambient temperature is proofreaied and correct based on the gas-filling temperature signal.
19. system as described as scheme 16, wherein said ambient temperature is proofreaied and correct based on ambient temperature signal.
20. system as described as scheme 16, the wherein said soot model tuning factor is determined by interpolation between the soot model tuning factor being associated with Different Altitude, thereby is determined the appropriate soot model tuning at specific environment temperature correction and operation height above sea level place.
By reference to the accompanying drawings, can easily know above-mentioned feature and advantage of the present invention and other feature and advantage from following detailed description of the present invention.
The accompanying drawing explanation
Further feature, advantage and details only present by way of example in embodiment's following detailed description, and described detailed description is with reference to accompanying drawing, wherein:
Fig. 1 is the schematic diagram of example system that the regeneration of the after-treatment components for controlling compression ignition engine is shown; With
Fig. 2 is the flow chart of example process that the regeneration of the after-treatment components for controlling compression ignition engine is shown.
Embodiment
In fact, following description is only exemplary, and is not intended to limit the disclosure, its application or use.Should be appreciated that in institute's drawings attached, corresponding reference character means identical or corresponding part and feature.As used herein, term " module " refers to application-specific IC (ASIC), electronic circuit, carries out the processor of one or more softwares or firmware program (share, special use or group) and storage, combinational logic circuit and/or other suitable components of described function is provided.
According to exemplary embodiment of the present invention, as shown in fig. 1, comprise the compression ignition engine 102 of vehicle (not shown) for the example system 100 of the regeneration of the after-treatment components of controlling compression ignition engine.Compression ignition engine 102 is attached to vent systems 104, by this vent systems 104, and processed before discharged to atmosphere from the waste gas of motor 102.Vent systems 104 is configured to reduce the exhaust gas constituents regulated, and therefore comprises at least one after-treatment components 106, and particulate filter for example, for removing particulate matter from waste gas streams and other is regulated composition.As is understood, after-treatment components described herein, system, model and control may be implemented in various engine systems.Such engine system can comprise, such as but not limited to, diesel engine, gasoline direct system and homogeneous charge compression-ignition engine system.
In the exemplary embodiment, after-treatment components 106 is cyclic regeneration catcher (CRT), and it not only comprises oxidation catalyst (OC) but also comprises particulate filter.The OC of CRT 106 can comprise and for example flows through formula metal or ceramic integral carrier.This carrier can be encapsulated in shell or tank, and shell or tank have for from motor 102, receiving the entrance of waste gas and the outlet be communicated with the particulate filter fluid of CRT 106.This carrier can comprise oxidation catalysis immunomodulator compounds disposed thereon.This oxidation catalysis immunomodulator compounds is applicable as coating, can contain platinum group metal, for example platinum (Pt), palladium (Pd), rhodium (Rh) or other suitable oxidation catalyst, or its combination.That OC processes unburned gaseous state and nonvolatile HC and CO, their oxidized formation CO and H
2O.
The particulate filter part operation of after-treatment components 106 becomes to filter out carbon and other particulate of waste gas.In each embodiment, the particulate filter of after-treatment components 106 part can be used wall-flow type monolithic filter or other filter for installation structure, such as being wound around or fiberfill fibers formula filter, open celled foam, sintered metal fiber etc.This filter can be encapsulated in shell or tank, and can have the entrance be communicated with the OC fluid and process the outlet of waste gas afterwards for discharging.
In the particulate filter part of after-treatment components 106, gathering of particulate matter periodically cleared up or regenerated.Regeneration comprises that the carbon that gathers and other particulate are usually at 600 ° of C of high temperature (>) oxidation or burning in environment.Oxidation in OC produces the required high temperature of regeneration.
As shown in fig. 1, heater 108 is configured to increase heat to after-treatment components 106, to cause on one's own initiative the regeneration in after-treatment components 106.Refresh controller 110 is configured to predict that the regeneration of when experiencing in after-treatment components is necessary or favourable, and, when appropriate, promotes on one's own initiative regeneration event.Refresh controller 110 can be for example by for example, from external source (heater 108) to after-treatment components, 106 introducing heats or by causing that fuel sprays set out motivation 102 or vent systems 104 and promotes this event.
In order to make refresh controller 110 can carry out better its function, various utensils are disposed in motor 102 and vent systems 104.Described utensil is configured to the variation in response to relevant parameter in motor 102 and vent systems 104, and to refresh controller 110 transmitted signals, the operation of these signal indication motors 102 and after-treatment components 104.For example, in the exemplary embodiment, upstream pressure sensor 112 is measured the pressure of after-treatment components 106 exhaust gases upstream streams and is produced upstream pressure signal 114.Similarly, downstream pressure sensor 116 is measured the pressure of after-treatment components 106 downstream flue gas streams and is produced downstream pressure signal 118.In addition, upstream temperature sensor 120 is measured the temperature of after-treatment components 106 exhaust gases upstream streams and is produced upstream temperature signal 122.
For example, in the exemplary embodiment, refresh controller 110 is configured to estimate based on the pressure drop index amount that in after-treatment components 106, particulate matter gathers, the reduction of the pressure of waste gas streams when this pressure drop exponential representation waste gas streams passes after-treatment components 106.In the exemplary embodiment, refresh controller 110 use upstream pressure signal 114 and downstream pressure signal 118 are calculated the pressure drop index.In addition, refresh controller 110 is used from the engine speed signal of engine speed sensor 128 or from the motor flow rate signal 134 of motor flow transducer 132 and produces the flow rate indexes.
Once produce the characteristic of mobile stream, the amount that refresh controller 110 gathers with regard to the particulate matter of estimating in after-treatment components 106.In the exemplary embodiment, refresh controller 110 is used soot to gather model, the soot rate figure of this model based on using the exploitation of motor discharge condition.In a further exemplary embodiment, refresh controller 110 is used the soot of the relation based between pressure drop index, flow rate exponential sum humidity index to gather model.Those skilled in the art can be clear, and the increase of the amount of the pressure drop when constant flow rate and temperature (, the reduction of pressure) means gathering of soot in after-treatment components 106 or other particulate matter.Those skilled in the art also can be clear, and the flow rate index can be standardized as standardization temperature and standardization pressure (for example, according to perfect gas law), to eliminate part or all inaccuracy relevant to the variation of the temperature and pressure of waste gas streams.This is possible, because known, even if temperature and/or the pressure of stream can change, between the pressure loss and this calibrated flow, also has consistent relation.
As mentioned above, the temperature that has realized that the environment of motor 102 operation can cause the significant change of the amount of soot of carrying in engine efflux.For making the impact that the soot model can the compensate for ambient temperature, to the prediction of output application of temperature correction factor produced by the soot model.For determining the temperature correction factor, first carry out relevant which ambient temperature parameter of using as proofreading and correct basic selection.In the exemplary embodiment, set up in advance data hierarchy.In a further exemplary embodiment, which parameter of user's choice for use.In another exemplary embodiment, for reliability is assessed the ambient temperature of sensing, and use more reliable parameter.This can cause using intake air temperature signals 144, gas-filling temperature signal 148 or ambient temperature signal 152.
Once select appropriate temperature signal, just known the or projected relationship between the temperature based on selecting and temperature and correction factor is determined correction factor.In the exemplary embodiment, can determine the correction factor of for example, locating at varying environment height above sea level (sea level, medium height above sea level and high height above sea level) with a plurality of coreected cures.A plurality of temperature correction factors that consequently run through the benchmark height above sea level of certain limit.Then can determine by for example interpolation the correction factor be associated with actual height above sea level.This actual height above sea level can be determined by external pressure.Finally, can apply this correction factor, to regulate the output of soot model, thus the compensate for ambient temperature.
Should be understood that, exist multiple expression to quantize and follow the trail of the pressure drop of after-treatment components.For example, in one embodiment, the pressure drop index is calculated as the ratio (that is, PR=Pu/Pd) of upstream pressure and downstream pressure, to mean the pressure ratio of after-treatment components both sides.In another embodiment, the pressure drop index is calculated as poor (that is, DP=Pu – Pd) between upstream pressure and downstream pressure, to mean the pressure difference of after-treatment components both sides.In another embodiment, the pressure drop index is calculated as difference between upstream pressure and downstream pressure divided by the size of upstream pressure (that is, as the standardization pressure drop, DPP=DP/Pu), poor with the pressure criteria that means the after-treatment components both sides.As those skilled in the clear, above-mentioned flow rate exponential signal can or be configured to by engine speed sensor or Mass Air Flow sensor any other sensor of engine operating condition that sensing means the relative flow rate of waste gas streams and produces.
In the time will carrying out or rely on soot based on pressure and gather model and estimate for soot, refresh controller 110 can gather model based on soot at least in part and estimate the particulate matter gathered in after-treatment components.As mentioned above, this model needs the knowledge of pressure, temperature and the flow rate of waste gas streams as mentioned above.In the exemplary embodiment, the estimated value produced by model means the amount of the particulate matter that expectation has been gathered in after-treatment components.Can the soot based on pressure based on posterior infromation gather model and be configured to be reflected in the relation between particulate matter quality, pressure drop index, the index of discharge and the humidity index of gathering in the after-treatment components of (that is, normalization output) under reference ambient temperature.As mentioned above, the normalization output that the soot based on pressure gathers model carrys out bi-directional scaling according to the temperature correction factor, the amount of the particulate matter gathered in after-treatment components for the specific environment temperature of motor 102 operations with prediction.
Because the estimated value of the material gathered in after-treatment components is followed the predetermined threshold be associated with after-treatment components and is made comparisons, and can promote indemnifying measure while due to the adjustment estimated value of the particulate matter gathered, surpassing predetermined threshold in after-treatment components, so the inaccuracy of this process likely unnecessarily or trigger regenerative process evening.Therefore, by application of temperature compensating factor as mentioned above, refresh controller 110 can improve the reliability of the estimation level that soot gathers, thereby reduces the demand to excessive nargin, and may eliminate unnecessary maintenance.
According to exemplary embodiment of the present invention, the example process 200 of for example, regenerating for the after-treatment components (CRT) of controlling compression ignition engine as shown in Figure 2, comprises the step (step 210) of the one or more values that receive the one or more parameters relevant to the waste gas streams that passes through after-treatment components substantially.In the exemplary embodiment, this parameter can mean pressure variation, upstream temperature, downstream temperature, engine speed or the motor flow rate of upstream pressure, downstream pressure, after-treatment components both sides.
Described value can be received as the signal from upstream pressure sensor 112, downstream pressure sensor 116, upstream temperature sensor 120, downstream temperature sensor 124, engine speed sensor 128 or motor flow transducer 132 or the combination based on them.Described parameter can be the humidity index of the pressure drop index of the reduction of waste air flow pressure while meaning waste gas streams by after-treatment components, the flow rate index that means the waste gas streams flow rate and/or expression exhaust flow temperature.
Except receiving one or more values, process 200 comprises determines the ambient temperature (step 220) of motor in its lower operation.More specifically, this step of process comprises: (a) receive intake air temperature signals (step 222); (b) receive gas-filling temperature signal (step 224); (c) reception environment (for example, on every side) temperature signal (step 226); (d) ambient temperature that is identified for soot model tuning purpose is proofreaied and correct (step 228).Ambient temperature is proofreaied and correct determine can be based on user's appointment selection or pre-defined algorithm (for example, data hierarchy or reliability assessment), this pre-defined algorithm causes at least one the selection based in intake air temperature signals, gas-filling temperature signal or ambient temperature signal.
Be based upon the definite ambient temperature of soot model tuning purpose and proofread and correct, refresh controller 110 is identified for the soot model tuning factor (step 230) of output of the soot model of adjusting ambient temperature.In the exemplary embodiment, refresh controller 110 is based on pressure signal, and suction pressure signal is for example determined the height above sea level (step 232) of power operation.Then, refresh controller 110 reads one or more figure, and (each figure is illustrated in motor and is determined operation part or near height above sea level, the for example medium height above sea level of 5000 feet and/or the high height above sea level of 10000 feet on sea level for example on sea level, for example sea level), to determine the soot model tuning factor (step 234) of the various height above sea level under the specific environment temperature correction.In addition, refresh controller 110 can be used practical operation height above sea level interpolation between the soot model tuning factor be associated with various height above sea level, thereby determines the appropriate soot model tuning (step 236) at specific environment temperature correction and operation height above sea level place.Further again, refresh controller 110 can promote setting and the adjusting to the restriction of ambient temperature or operation height above sea level, exceed this restriction, the soot based on pressure gathers the reliable adjustment (step 240) that model can be considered to insecure or be unsuitable for the base condition that is developed or demarcates from this model.
In the exemplary embodiment, the step (step 250) of estimating to gather in after-treatment components the amount of particulate matter starts from meaning calculating or the reception (step 252) of the pressure drop index of the pressure decreased of waste gas streams when waste gas streams passes after-treatment components.The pressure decreased level of waste gas streams experience when in the exemplary embodiment, pressure drop exponential representation waste gas streams is through after-treatment components.In one embodiment, the pressure drop index is calculated as the pressure ratio (that is, PR=Pu/Pd) of upstream and downstream, to mean the pressure ratio of after-treatment components both sides.
In another embodiment, the pressure drop index is calculated as poor (that is, DP=Pu – Pd) between upstream and downstream pressure, to mean the pressure difference of after-treatment components both sides.In another enforcement embodiment, the pressure drop index is calculated as difference between upstream and downstream pressure divided by the size of upstream pressure (that is, as the standardization pressure drop, DPP=DP/Pu), to mean the standardization pressure difference of after-treatment components both sides.Estimate that the illustrative steps (step 250) of gathering the amount of particulate matter in after-treatment components also comprises the flow rate index (step 254) of determining the relative flow rate that means waste gas streams.The flow rate exponential signal can or be configured to any other sensor generation that sensing means the engine operating condition of the relative flow rate of waste gas streams by engine speed sensor or Mass Air Flow sensor.
Once determine the pressure drop exponential sum index of discharge of waste gas streams, gather the illustrative steps (step 250) of the amount of particulate matter in the estimation after-treatment components and just utilize the soot based on pressure to gather the gather particulate matter of model (step 256) based on pressure drop exponential sum flow rate index estimation after-treatment components.As mentioned above, can develop or demarcate the soot model, with corresponding to base condition, simultaneously by the application of the appropriate soot model tuning at specific environment temperature correction and operation height above sea level place, complete the adjustment to actual environment condition (height above sea level and temperature), it is the exploitation of the temperature based on selecting (step 230) by refresh controller 110.
Therefore, produce the estimated value of the particulate matter quality that means that prediction has been gathered in after-treatment components.The soot based on pressure that the posterior infromation of take is basis gathers model and is configured to reflect the relation between particulate matter quality, pressure drop index, the index of discharge and the motor certain environmental conditions that (or) operating under it of gathering in after-treatment components.Other technology can reflect other relation, can be associated to similarly observed data.
In the exemplary embodiment, the step (step 270) that starts remedial measure comprises regulates one or more control parameters of engine, to revise the operation of motor, thereby promotes the passive regeneration (step 272) in after-treatment components.For example, described one or more adjustment can be configured to provide minimum temperature at the after-treatment components place, promote the passive regeneration in after-treatment components.Perhaps, described one or more adjustment can comprise fuel supply and the timing (step 274) of revising motor, or activate auxiliary heating element to improve the temperature (step 276) of waste gas streams, or activate in order to indicate the operator to start the emergency warning lamp (step 278) of the regeneration (or replacing) of after-treatment components.
Although with reference to exemplary embodiment, described the present invention, it will be appreciated by those skilled in the art that and can carry out multiple change not breaking away under scope of the invention situation, and can substitute its element by equivalent.In addition, not breaking away under its essential scope situation according to instruction of the present invention, can carry out many modifications to adapt to particular condition or material.Therefore, be intended to the invention is not restricted to disclosed specific embodiment, but the present invention will comprise all mode of executions that fall in the application's scope.
Claims (10)
1. the method for the regeneration of the after-treatment components of control engine comprises:
Reception is in response to the signal of the pressure variation of after-treatment components both sides;
Use soot to gather model and calculate the estimated value of gathering particulate matter in described after-treatment components, described soot gathers the operation that model is demarcated as simulation motor under base condition;
Proofread and correct and determine the soot model tuning factor based on ambient temperature at least in part;
The described estimated value of gathering particulate matter in described after-treatment components is applied the described soot model tuning factor, to produce the temperature correction estimated value of gathering particulate matter in described after-treatment components;
Follow the predetermined threshold be associated with described after-treatment components to make comparisons the temperature correction estimated value of gathering particulate matter in described after-treatment components; With
When surpassing described predetermined threshold, the temperature correction estimated value of gathering particulate matter in described after-treatment components starts remedial measure.
2. the method for claim 1, wherein said ambient temperature is proofreaied and correct based on intake air temperature signals.
3. the method for claim 1, wherein said ambient temperature is proofreaied and correct based on the gas-filling temperature signal.
4. the method for claim 1, wherein said ambient temperature is proofreaied and correct based on ambient temperature signal.
5. the method for claim 1, the wherein said soot model tuning factor is determined by interpolation between the soot model tuning factor being associated with various height above sea level, thereby is determined the appropriate soot model tuning at specific environment temperature correction and operation height above sea level place.
6. the method for claim 1, wherein said soot gathers the pressure drop index of model pressure decreased of waste gas streams when meaning waste gas streams through described after-treatment components.
7. method as claimed in claim 6, wherein said pressure drop indication means the pressure ratio of described after-treatment components both sides.
8. the method for claim 1, wherein said soot gathers the flow rate index of the flow rate of model based on meaning described waste gas streams.
9. method as claimed in claim 8, the speed of wherein said flow rate index based on described motor.
10. the system for the regeneration of the after-treatment components of control engine comprises:
Refresh controller, it has the processor that is attached to storage device, and described refresh controller is configured to:
Reception is in response to the signal of the pressure variation of after-treatment components both sides;
Use soot to gather model and calculate the estimated value of gathering particulate matter in described after-treatment components, described soot gathers the operation that model is demarcated as simulation motor under base condition;
Proofread and correct to determine the soot model tuning factor based on ambient temperature at least in part;
The described estimated value of gathering particulate matter in described after-treatment components is applied the described soot model tuning factor, to produce the temperature correction estimated value of gathering particulate matter in described after-treatment components;
Follow the predetermined threshold be associated with described after-treatment components to make comparisons the temperature correction estimated value of gathering particulate matter in described after-treatment components; With
When surpassing described predetermined threshold, the temperature correction estimated value of gathering particulate matter in described after-treatment components starts remedial measure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/470,753 | 2012-05-14 | ||
| US13/470,753 US20130298529A1 (en) | 2012-05-14 | 2012-05-14 | System amd method for controlling an after-treatment component of a compression-ignition engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103422957A true CN103422957A (en) | 2013-12-04 |
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|---|---|---|---|
| CN2013101765383A Pending CN103422957A (en) | 2012-05-14 | 2013-05-14 | System amd method for controlling an after-treatment component of a compression-ignition engine |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20130298529A1 (en) |
| CN (1) | CN103422957A (en) |
| DE (1) | DE102013208264A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| DE102013208264A1 (en) | 2013-11-14 |
| US20130298529A1 (en) | 2013-11-14 |
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