CN112696251A - SCR conversion efficiency recovery method and device and vehicle - Google Patents
SCR conversion efficiency recovery method and device and vehicle Download PDFInfo
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- CN112696251A CN112696251A CN202011599594.4A CN202011599594A CN112696251A CN 112696251 A CN112696251 A CN 112696251A CN 202011599594 A CN202011599594 A CN 202011599594A CN 112696251 A CN112696251 A CN 112696251A
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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
- F01N2250/00—Combinations of different methods of purification
- F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
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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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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
- Y02T10/12—Improving ICE efficiencies
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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 discloses an SCR conversion efficiency recovery method, an SCR conversion efficiency recovery device and a vehicle, which are used for improving the SCR conversion efficiency of a vehicle post-treatment system, wherein the vehicle post-treatment system comprises an SCR device and a DPF, and an SCR conversion efficiency pulse spectrum is prestored in the vehicle post-treatment system, and the method comprises the following steps: acquiring first conversion efficiency of the SCR device under the current exhaust gas flow and the current exhaust gas temperature; according to the SCR conversion efficiency pulse spectrum, comparing the magnitude of a first conversion efficiency threshold value and the magnitude of a first conversion efficiency in the SCR conversion efficiency pulse spectrum under the current exhaust gas flow and the exhaust gas temperature; and if the first conversion efficiency is smaller than the first conversion efficiency threshold value, controlling the DPF to execute active regeneration. The technical scheme provided by the invention has the advantages that the SCR conversion efficiency is reduced but NO NO is generatedxWhen the fault exceeds 1.2, active regeneration is triggered in advance, so that the problem of low SCR conversion efficiency is solved, the occurrence of DPF overload blocking faults is reduced, the labor cost is saved, and the economic benefit is improved.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a method and a device for recovering SCR conversion efficiency and a vehicle.
Background
China-six firewood on the current marketIn an oil engine, problems such as selective Catalytic reduction (scr) device crystallization, urea nozzle crystallization, sulfur poisoning of an after-treatment device and the like frequently occur, so that the after-treatment conversion efficiency is often reduced, and nitrogen oxides NOxExcessive emissions, causing NOxAn over 1.2 fault occurs; in addition, due to the problems of calculation deviation of the carbon loading model, measurement error of the differential pressure sensor and the like, overload blocking faults of the Particulate trap DPF (diesel Particulate filter) are easily caused.
In the prior art, it is common that NO is presentxAfter the emission exceeds the standard, the maintenance service personnel perform manual parking regeneration, eliminate crystallization at high temperature, solve the problem of sulfur poisoning, further recover the function of the post-treatment device, improve the SCR conversion efficiency, but have the problems of manpower cost waste, fault frequency increase, market public praise and poor economic cost.
Disclosure of Invention
The embodiment of the invention provides a method and a device for recovering SCR conversion efficiency and a vehicle, wherein the SCR conversion efficiency is reduced but NO NO is generatedxWhen the fault exceeds 1.2, active regeneration is triggered in advance, so that the problem of low SCR conversion efficiency can be effectively solved, the occurrence of DPF overload blocking faults is reduced, the labor cost can be saved, vehicle maintenance service is facilitated, and the method has huge market potential and economic benefit.
In a first aspect, an embodiment of the present invention provides an SCR conversion efficiency recovery method for improving SCR conversion efficiency of a vehicle aftertreatment system, where the vehicle aftertreatment system includes a selective catalytic reduction SCR device and a particulate trap DPF, and the vehicle aftertreatment system prestores an SCR conversion efficiency pulse spectrum, and the SCR conversion efficiency recovery method includes:
acquiring first conversion efficiency of the SCR device under the current exhaust gas flow and the current exhaust gas temperature;
according to the SCR conversion efficiency pulse spectrum, comparing a first conversion efficiency threshold value and the first conversion efficiency in the SCR conversion efficiency pulse spectrum under the current exhaust gas flow and the exhaust gas temperature;
and if the first conversion efficiency is smaller than the first conversion efficiency threshold value, controlling the DPF to execute active regeneration.
Optionally, after controlling the DPF to perform active regeneration, the method further includes:
obtaining a second conversion efficiency of the SCR device under the current exhaust gas flow and the current exhaust gas temperature again;
comparing a second conversion efficiency threshold with the magnitude of the second conversion efficiency;
and if the second conversion efficiency is smaller than the second conversion efficiency threshold value, controlling the DPF to execute second active regeneration.
Optionally, after controlling the DPF to perform the second active regeneration, the method further includes:
obtaining the third conversion efficiency of the SCR device again under the current exhaust gas flow and the current exhaust gas temperature;
comparing a third conversion efficiency threshold to the magnitude of the third conversion efficiency;
and if the third conversion efficiency is smaller than the third conversion efficiency threshold value, judging that the SCR device is in fault.
Optionally, obtaining the first conversion efficiency of the SCR device at the current exhaust gas flow and exhaust gas temperature includes:
acquiring the concentration of nitrogen oxide at the upstream of the SCR device measured by an upstream nitrogen oxide sensor of the SCR device in a first time period;
acquiring the concentration of the downstream nitrogen oxides of the SCR device measured by a downstream nitrogen oxide sensor of the SCR device in the first time period;
and acquiring the first conversion efficiency according to the concentration of nitrogen oxides at the upstream of the SCR device and the concentration of nitrogen oxides at the downstream of the SCR device in the first time period.
Optionally, the first conversion efficiency threshold is greater than an emissions-overrun malfunction-alert threshold.
Optionally, the active regeneration is driving regeneration.
In a second aspect, an embodiment of the present invention provides an SCR conversion efficiency recovery device for improving SCR conversion efficiency of a vehicle aftertreatment system, the vehicle aftertreatment system including a selective catalytic reduction SCR device and a particulate trap DPF, the vehicle aftertreatment system having a prestored SCR conversion efficiency pulse spectrum, the SCR conversion efficiency recovery device including:
the acquisition module is used for acquiring the first conversion efficiency of the SCR device under the current exhaust gas flow and the current exhaust gas temperature;
the comparison module is used for comparing a first conversion efficiency threshold value and the first conversion efficiency in the SCR conversion efficiency pulse spectrum under the current exhaust gas flow and the exhaust gas temperature according to the SCR conversion efficiency pulse spectrum;
a control module to control the DPF to perform active regeneration when the first conversion efficiency is less than the first conversion efficiency threshold.
Optionally, the obtaining module is further configured to obtain a second conversion efficiency of the SCR device at the current exhaust gas flow and exhaust gas temperature again after controlling the DPF to perform active regeneration;
the comparison module is further used for comparing a second conversion efficiency threshold value with the second conversion efficiency;
the control module is further configured to control the DPF to perform a second active regeneration when the second conversion efficiency is less than the second conversion efficiency threshold.
Optionally, the obtaining module is further configured to obtain a third conversion efficiency of the SCR device at the current exhaust gas flow and the exhaust gas temperature again after controlling the DPF to perform the second active regeneration;
the comparison module is further used for comparing a third conversion efficiency threshold value with the third conversion efficiency;
the control module is further configured to determine that the SCR device is malfunctioning when the third conversion efficiency is less than the third conversion efficiency threshold.
In a third aspect, an embodiment of the invention provides a vehicle, which includes the SCR conversion efficiency recovery device.
In the embodiment of the invention, the first conversion efficiency of the SCR device at the current exhaust gas flow and the exhaust gas temperature is obtained, and the current exhaust gas flow in the SCR conversion efficiency pulse spectrum prestored in the vehicle aftertreatment system is readAnd a first conversion efficiency threshold value under the exhaust gas temperature, comparing the first conversion efficiency with the first conversion efficiency threshold value, and controlling the DPF to execute active regeneration when the first conversion efficiency is smaller than the first conversion efficiency threshold value, so that the SCR conversion efficiency of the vehicle aftertreatment system can be improved, wherein the first conversion efficiency threshold value can be set to be smaller than NOxError reporting threshold of over 1.2 fault, i.e. NO present at reduced SCR conversion efficiencyxWhen the fault exceeds 1.2, the DPF is controlled to trigger the active regeneration function, the problem of low SCR conversion efficiency can be effectively solved, the occurrence of the fault caused by DPF overload blockage is reduced, the labor cost can be saved, the vehicle maintenance service is facilitated, and the large market potential and the economic benefit are realized.
Drawings
FIG. 1 is a flow chart of a method for recovering SCR conversion efficiency according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for obtaining a first conversion efficiency of an SCR device at a current exhaust flow and exhaust temperature provided by an embodiment of the present invention;
FIG. 3 is a flow chart of another SCR conversion efficiency recovery method provided by an embodiment of the present invention;
FIG. 4 is a flow chart of yet another SCR conversion efficiency recovery method provided by an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an SCR conversion efficiency device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a vehicle according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the national six diesel engine on the market at present, the crystallization problem of an SCR device, the crystallization problem of a urea nozzle and the post-treatment sulfur poisoning problem are frequent, so that the post-treatment conversion efficiency is reduced, and NO is generatedxExcessive emissions, causing NOxOver 1.2 fault (NO emitted)xPollutants exceeding the national standard 1.2 g/(kW.h)); in addition, when the DPF exceeds a certain load capacity, overload plugging failure of the DPF is easily caused to occur.
In view of the above technical problems, an embodiment of the present invention provides a method for recovering SCR conversion efficiency, which is used to improve the SCR conversion efficiency of a vehicle aftertreatment system, where the vehicle aftertreatment system includes a selective catalytic reduction SCR device and a particulate trap DPF, and an SCR conversion efficiency pulse spectrum is prestored in the vehicle aftertreatment system. Fig. 1 is a flowchart of a method for recovering SCR conversion efficiency according to an embodiment of the present invention. As shown in fig. 1, the SCR conversion efficiency recovery method includes:
and S110, acquiring the first conversion efficiency of the SCR device under the current exhaust gas flow and the current exhaust gas temperature.
It should be noted that, the SCR conversion efficiency recovery method, device and vehicle provided in the embodiments of the present invention need to satisfy the following function release conditions:
1) the entire vehicle is running on the road, and the exhaust gas flow and exhaust gas temperature of the engine are within a certain range. Typical DPF active regeneration functions include park regeneration and drive regeneration, and SCR conversion efficiency also typically decreases when the exhaust gas flow rate of the engine is large or the exhaust gas temperature is not within a suitable temperature range. The SCR conversion efficiency recovery method provided by the embodiment of the invention can be executed in the running process of a whole vehicle, and the exhaust gas flow and the exhaust gas temperature of an engine are in a normal range.
2) The functions of the upstream nitrogen oxide sensor and the downstream nitrogen oxide sensor of the SCR device are released normally, and the nitrogen oxide concentration in the upstream and the downstream can be measured correctly.
3) The nox sensor is not malfunctioning, the urea injection is not malfunctioning, and there are no other related malfunctions that affect regeneration.
4) And the running regeneration condition of the related DPF is met.
In the case where the above function release condition is satisfied, the SCR conversion efficiency recovery method first needs to acquire the current actual conversion efficiency of the SCR device, that is, the SCR device at the current exhaust gas flow rate and exhaust gas temperatureFirst conversion efficiency of (1). The SCR device is a selective catalytic reduction device, tail gas enters an exhaust mixing pipe after coming out of a turbine, a urea metering injection device is arranged on the mixing pipe and is injected into urea water solution, and NH is generated after hydrolysis and pyrolysis reaction of the urea at high temperature3Using NH on the surface of the SCR device catalyst3Reduction of NOxDischarge N2Excess NH3Is also oxidized to N2To prevent leakage, the complex physical and chemical reactions that occur in SCR devices include: injection, atomization, evaporation of aqueous urea solution, hydrolysis of urea and pyrolysis gas phase chemical reaction, and NOxOn the surface of the catalyst with NH3The catalytic surface chemistry that takes place. Whether the SCR conversion efficiency is reduced or not and whether the SCR conversion efficiency needs to be improved or not is judged, namely whether the first conversion efficiency of the SCR device at the obtained current exhaust gas flow and the obtained exhaust gas temperature is lower than a pre-stored threshold value or not is judged.
FIG. 2 is a flow chart for obtaining a first conversion efficiency of an SCR device at a current exhaust flow and exhaust temperature provided by an embodiment of the present invention. Alternatively, referring to fig. 2, the step S110 of obtaining the first conversion efficiency of the SCR device at the current exhaust gas flow and exhaust gas temperature may include:
s1101, acquiring the concentration of the NOx at the upstream of the SCR device, which is measured by a NOx sensor at the upstream of the SCR device in a first time period.
And S1102, acquiring the concentration of the NOx at the downstream of the SCR device, which is measured by a NOx sensor at the downstream of the SCR device in a first time period.
S1103, acquiring a first conversion efficiency according to the concentration of nitrogen oxides at the upstream of the SCR device and the concentration of nitrogen oxides at the downstream of the SCR device in a first time period.
The SCR device is provided with an upstream nitrogen oxide sensor at an upstream inlet, and a downstream nitrogen oxide sensor at a downstream outlet, and a first conversion efficiency of the SCR device at the current exhaust gas flow rate and the exhaust gas temperature can be obtained by obtaining an upstream nitrogen oxide concentration of the SCR device measured by the upstream nitrogen oxide sensor and a downstream nitrogen oxide concentration measured by the downstream nitrogen oxide sensor in a first time period and performing integral calculation on the upstream nitrogen oxide concentration and the downstream nitrogen oxide concentration, wherein a duration of the first time period can be selected according to actual conditions, and the embodiment of the invention is not limited thereto.
And S120, comparing the first conversion efficiency threshold value and the first conversion efficiency in the SCR conversion efficiency pulse spectrum under the current exhaust gas flow and the exhaust gas temperature according to the SCR conversion efficiency pulse spectrum.
The SCR conversion efficiency pulse spectrum can be a relation graph of exhaust gas flow and exhaust gas temperature and SCR conversion efficiency, can be stored in a vehicle post-treatment system in a preset mode, can be calibrated in advance according to different engines, and can read a first conversion efficiency threshold value, namely a pre-stored threshold value, under the current exhaust gas flow and the exhaust gas temperature from the SCR conversion efficiency pulse spectrum in the vehicle post-treatment system; the first conversion efficiency threshold value may then be compared with a first conversion efficiency value, i.e. the actual conversion efficiency of the SCR device at the current exhaust gas flow rate and exhaust gas temperature may be compared with a predetermined threshold value.
Alternatively, the first conversion efficiency threshold may be greater than an emissions-overrun malfunction-alert threshold.
The fault alarm threshold for emissions overrun may be the occurrence of NOxAnd exceeding the conversion efficiency alarm threshold of the SCR device at the fault of 1.2. NOxOver 1.2 fault, i.e. NO in the exhaustxWhen the pollutant exceeds the national standard of 1.2g/(kW.h), the conversion efficiency of the SCR device is deteriorated and fails, which does not meet the requirements of related legal regulations. The embodiment of the invention sets the first conversion efficiency threshold value in the SCR conversion efficiency pulse spectrum in the vehicle post-processing system under the condition that the first conversion efficiency threshold value is larger than the fault alarm threshold value of the emission overrun, so that the reduction of the SCR conversion efficiency can be ensured, but NO NO still appearsxWhen the fault exceeds 1.2, the regeneration function can be controlled and executed in advance, the problem of low SCR conversion efficiency is effectively solved, and the occurrence of DPF overload blocking faults is reduced. For example, the fault alarm threshold value of the emission overrun may be set to 70%, and the first conversion efficiency threshold value may be set to 75%, and the setting of the first conversion efficiency threshold value in the SCR conversion efficiency pulse spectrum according to the embodiment of the present invention may be set according to actual conditions as long as it is ensured that the first conversion efficiency threshold value is larger than the emissionAnd (4) setting an out-of-limit fault alarm threshold value.
And S130, if the first conversion efficiency is smaller than a first conversion efficiency threshold value, controlling the DPF to execute active regeneration.
Under the current exhaust gas flow and exhaust gas temperature states, if the first conversion efficiency of the SCR device is lower than the first conversion efficiency threshold value in the SCR conversion efficiency pulse spectrum, that is, it indicates that the conversion efficiency of the SCR device is reduced, and the first conversion efficiency is lower than the predetermined threshold value, after the relevant conditions are met, the DPF can be controlled to perform an active regeneration function, that is, the DPF, the Oxidation catalyst doc (diesel Oxidation catalyst), the sulfate on the surface of the SCR device carrier, the soluble Organic component sof (soluble Organic fraction), the SCR device internal crystal, the urea nozzle crystal and the like are controlled to be raised, oxidized and combusted, so that the aftertreatment function is activated, and the conversion efficiency of the SCR device is recovered.
Alternatively, the active regeneration may be regeneration of a train. Under the high temperature condition, the action of removing particles by burning the particles and oxygen in the DPF is called active regeneration, and the driving regeneration is one of the active regeneration and is the action of carrying out the active regeneration in the driving process of a vehicle. The SCR conversion efficiency recovery method provided by the embodiment of the invention can perform the DPF active regeneration function during the running of the whole vehicle road, improve the SCR conversion efficiency, save the labor cost and improve the economic benefit compared with the prior art.
In the embodiment of the invention, the upstream nitrogen oxide concentration and the downstream nitrogen oxide concentration of the SCR device at the current exhaust gas flow and the current exhaust gas temperature are obtained, the first conversion efficiency is obtained through calculation, the first conversion efficiency threshold value at the current exhaust gas flow and the exhaust gas temperature in the SCR conversion efficiency pulse spectrum prestored in the vehicle post-treatment system is read, the first conversion efficiency threshold value is set to be smaller than the fault alarm threshold value of the over-limit emission, the first conversion efficiency and the first conversion efficiency threshold value are compared, and when the first conversion efficiency is smaller than the first conversion efficiency threshold value, the DPF is controlled to execute driving regeneration, so that the SCR conversion efficiency of the vehicle post-treatment system can be improved, namely the SCR conversion efficiency is reduced but NO NO appears, the SCR conversion efficiency is improvedxWhen the fault exceeds 1.2, the DPF is controlled to trigger the active regeneration function, and the SCR conversion can be effectively solvedThe problem of inefficiency reduces DPF overload jam trouble and takes place, still can practice thrift the human cost, improves economic benefits.
On the basis of the above embodiments, the embodiment of the invention also provides another SCR conversion efficiency recovery method. FIG. 3 is a flow chart of another SCR conversion efficiency recovery method according to an embodiment of the present invention. As shown in fig. 3, the SCR conversion efficiency recovery method may further include:
s210, acquiring the first conversion efficiency of the SCR device under the current exhaust gas flow and the current exhaust gas temperature.
S220, comparing the first conversion efficiency threshold value and the first conversion efficiency in the SCR conversion efficiency pulse spectrum under the current exhaust gas flow and the exhaust gas temperature according to the SCR conversion efficiency pulse spectrum.
And S230, if the first conversion efficiency is smaller than a first conversion efficiency threshold value, controlling the DPF to execute active regeneration.
And S240, acquiring the second conversion efficiency of the SCR device under the current exhaust gas flow and the current exhaust gas temperature again.
And under the condition that the first conversion efficiency of the SCR device is smaller than the first conversion efficiency threshold value, the DPF performs an active regeneration function, namely the DPF performs the first active regeneration and the SCR conversion efficiency is improved for the first time. After the DPF performs the first active regeneration, that is, after the SCR conversion efficiency is first improved, the embodiment of the present invention may further detect whether the first DPF active regeneration operation successfully recovers the SCR conversion efficiency, and perform the second DPF active regeneration if the SCR conversion efficiency is not successfully recovered. First, by obtaining the current exhaust gas flow and the second conversion efficiency of the SCR device at the exhaust gas temperature, the upstream nox concentration of the SCR device measured by the upstream nox sensor of the SCR device and the downstream nox concentration of the SCR device measured by the downstream nox sensor in the second period can be obtained, and the second conversion efficiency is obtained according to the upstream nox concentration of the SCR device and the downstream nox concentration of the SCR device in the second period.
And S250, comparing the second conversion efficiency threshold value with the second conversion efficiency.
After the DPF performs the first active regeneration, that is, after the SCR conversion efficiency is improved for the first time, the generally default SCR conversion efficiency is greatly improved, so that the second conversion efficiency obtained by default may be greater than the first conversion efficiency threshold, at this time, the second conversion efficiency needs to be compared with the second conversion efficiency threshold, the second conversion efficiency threshold may also be obtained from an SCR conversion efficiency pulse spectrum in the vehicle aftertreatment system, the generally second conversion efficiency threshold is greater than the first conversion efficiency threshold, for example, the first conversion efficiency threshold may be set to 75%, and the second conversion efficiency threshold may be set to 95%.
And S260, if the second conversion efficiency is smaller than a second conversion efficiency threshold value, controlling the DPF to execute second active regeneration.
Comparing the second conversion efficiency with a second conversion efficiency threshold, and if the second conversion efficiency is greater than or equal to the second conversion efficiency threshold, indicating that the first DPF successfully performs active regeneration to improve and recover the SCR conversion efficiency, ending; if the second conversion efficiency is smaller than the second conversion efficiency threshold, it is determined that the first DPF active regeneration does not recover the SCR conversion efficiency to the preset state, and the DPF is controlled to execute the second active regeneration again, where the preset state may be embodied by setting a value of the second conversion efficiency threshold, and a higher second conversion efficiency threshold indicates a higher preset state to be recovered.
According to the technical scheme of the embodiment of the invention, the first conversion efficiency of the SCR device under the current exhaust gas flow and the exhaust gas temperature is obtained and is compared with the first conversion efficiency threshold value under the current exhaust gas flow and the exhaust gas temperature in the SCR conversion efficiency pulse spectrum prestored in the vehicle post-processing system, and the DPF is controlled to execute the first active regeneration when the first conversion efficiency is smaller than the first conversion efficiency threshold value; after the DPF completes the first active regeneration, namely the SCR conversion efficiency is improved for the first time, further acquiring a second conversion efficiency, comparing the second conversion efficiency with a second conversion efficiency threshold value, and controlling the DPF to perform the second active regeneration when the second conversion efficiency is smaller than the second conversion efficiency threshold value, namely after the first DPF active regeneration is performed, also acquiring the second conversion efficiency, comparing the second conversion efficiency with the second conversion efficiency threshold value, and using the second conversion efficiency threshold value to perform comparisonWhether the SCR conversion efficiency is successfully recovered is detected, and if the second conversion efficiency is larger than or equal to a second conversion efficiency threshold value, the first DPF active regeneration is successful in recovering the SCR conversion efficiency; if the second conversion efficiency is smaller than the second conversion efficiency threshold, which indicates that the first DPF active regeneration does not recover the SCR conversion efficiency to the preset state, the second DPF active regeneration needs to be performed, so that the accuracy of the SCR conversion efficiency recovery method can be improved, and NO is further avoidedxAnd (4) occurrence of emission over 1.2 fault and DPF overload blocking fault.
On the basis of the embodiment, the embodiment of the invention also provides another SCR conversion efficiency recovery method. FIG. 4 is a flow chart of another SCR conversion efficiency recovery method according to an embodiment of the present invention. As shown in fig. 4, the SCR conversion efficiency recovery method may further include:
and S310, acquiring the first conversion efficiency of the SCR device under the current exhaust gas flow and the current exhaust gas temperature.
S320, comparing the first conversion efficiency threshold value and the first conversion efficiency in the SCR conversion efficiency pulse spectrum under the current exhaust gas flow and the exhaust gas temperature according to the SCR conversion efficiency pulse spectrum.
And S330, if the first conversion efficiency is smaller than the first conversion efficiency threshold value, controlling the DPF to execute active regeneration.
And S340, acquiring the second conversion efficiency of the SCR device under the current exhaust gas flow and the current exhaust gas temperature again.
And S350, comparing the second conversion efficiency threshold value with the second conversion efficiency.
And S360, if the second conversion efficiency is smaller than a second conversion efficiency threshold value, controlling the DPF to execute second active regeneration.
And S370, acquiring the third conversion efficiency of the SCR device under the current exhaust gas flow and the current exhaust gas temperature again.
And S380, comparing the third conversion efficiency threshold with the third conversion efficiency.
And S390, if the third conversion efficiency is smaller than the third conversion efficiency threshold value, judging that the SCR device is in fault.
After the DPF performs the second active regeneration, the embodiment of the present invention may further be configured to obtain a third conversion efficiency, that is, obtain the third conversion efficiency of the SCR device at the current exhaust gas flow rate and the exhaust gas temperature, obtain an upstream nox concentration of the SCR device measured by an upstream nox sensor of the SCR device during a third period of time, and obtain a downstream nox concentration of the SCR device measured by a downstream nox sensor of the SCR device, and obtain the third conversion efficiency according to the upstream nox concentration of the SCR device and the downstream nox concentration of the SCR device during the third period of time.
After the third conversion efficiency is obtained, the embodiment of the invention may further set a third conversion efficiency to be compared with the second conversion efficiency threshold, and if the third conversion efficiency is greater than or equal to the second conversion efficiency threshold, it indicates that the second active regeneration operation of the DPF succeeds in recovering the SCR conversion efficiency, then the operation is ended; if the third conversion efficiency is still smaller than the second conversion threshold, which indicates that the SCR conversion efficiency is still not successfully recovered, the third conversion efficiency is set to be compared with the third conversion efficiency threshold. In consideration of whether the vehicle aftertreatment system has an SCR device failure, a DPF active regeneration failure, or other failure conditions during the SCR conversion efficiency recovery operation, so that the SCR conversion efficiency cannot be recovered to the preset state even though the DPF active regeneration operation is performed twice, a third conversion efficiency threshold is set, and the third conversion efficiency threshold is set to be greater than the first conversion efficiency threshold and smaller than the second conversion efficiency threshold, for example, the first conversion efficiency threshold may be set to be 75%, the second conversion efficiency threshold may be set to be 95%, and the third conversion efficiency threshold may be set to be 85%. Under the condition that the third conversion efficiency is smaller than the second conversion efficiency threshold, setting the third conversion efficiency to be compared with the third conversion efficiency threshold, if the third conversion efficiency is larger than or equal to the third conversion efficiency threshold, judging that the SCR device fails, the DPF active regeneration function fails or other faults do not occur, further performing DPF active regeneration operation, and keeping the current SCR conversion efficiency state; if the third conversion efficiency is smaller than the third conversion efficiency threshold value, the SCR device can be judged to be in fault or other fault problems occur, and a user is reminded to overhaul the engine.
According to the technical scheme of the embodiment of the invention, the first conversion efficiency of the SCR device under the current exhaust gas flow and the exhaust gas temperature is obtained and is compared with the first conversion efficiency threshold value under the current exhaust gas flow and the exhaust gas temperature in the SCR conversion efficiency pulse spectrum prestored in the vehicle post-processing system, and the DPF is controlled to execute the first active regeneration when the first conversion efficiency is smaller than the first conversion efficiency threshold value; after the first DPF active regeneration is executed, a second conversion efficiency is obtained and compared with a second conversion efficiency threshold value to detect whether the SCR conversion efficiency is successfully recovered, if the second conversion efficiency is smaller than the second conversion efficiency threshold value, the first DPF active regeneration does not enable the SCR conversion efficiency to be recovered to a preset state, and then the second DPF active regeneration is needed; after the second DPF active regeneration is performed, a third conversion efficiency may also be obtained, the third conversion efficiency is compared with the second conversion efficiency threshold, if the third conversion efficiency is greater than or equal to the second conversion efficiency threshold, the end is reached, if the third conversion efficiency is still less than the second conversion efficiency threshold, the third conversion efficiency is compared with the third conversion efficiency threshold, and if the third conversion efficiency is less than the third conversion efficiency threshold, the SCR device is determined to be faulty. The embodiment of the invention not only can effectively solve the problem of low SCR conversion efficiency and reduce the occurrence of DPF overload blocking faults, thereby saving the labor cost and improving the economic benefit, but also can improve the accuracy of the SCR conversion efficiency recovery method, and can judge whether the SCR device has faults or not in time, thereby facilitating the vehicle maintenance service.
Based on the same conception, the embodiment of the invention also provides an SCR conversion efficiency recovery device, which can execute any SCR conversion efficiency recovery method provided by the embodiment and is used for improving the SCR conversion efficiency of a vehicle aftertreatment system, wherein the vehicle aftertreatment system comprises a Selective Catalytic Reduction (SCR) device and a particle trap (DPF), and the SCR conversion efficiency pulse spectrum is prestored in the vehicle aftertreatment system. Fig. 5 is a schematic structural diagram of an SCR conversion efficiency device according to an embodiment of the present invention. As shown in fig. 5, the SCR conversion efficiency recovery apparatus 10 includes: an obtaining module 100, configured to obtain a first conversion efficiency of the SCR device at a current exhaust gas flow rate and an exhaust gas temperature; the comparison module 200 is used for comparing the first conversion efficiency threshold value and the first conversion efficiency in the SCR conversion efficiency pulse spectrum under the current exhaust gas flow and the exhaust gas temperature according to the SCR conversion efficiency pulse spectrum; the control module 300 controls the DPF to perform active regeneration when the first conversion efficiency is less than a first conversion efficiency threshold.
Optionally, the obtaining module 100 is configured to obtain a first conversion efficiency of the SCR device at the current exhaust gas flow and the current exhaust gas temperature, and specifically may include: acquiring the concentration of the NOx at the upstream of the SCR device measured by an NOx sensor at the upstream of the SCR device in a first time period; acquiring the concentration of the downstream nitrogen oxide of the SCR device measured by a downstream nitrogen oxide sensor of the SCR device in a first time period; a first conversion efficiency is obtained based on the concentration of NOx upstream of the SCR device and the concentration of NOx downstream of the SCR device during the first time period.
In the embodiment of the invention, the upstream nitrogen oxide concentration and the downstream nitrogen oxide concentration of the SCR device under the current exhaust gas flow and the exhaust gas temperature are obtained through an obtaining module, the first conversion efficiency is obtained through calculation, the first conversion efficiency threshold value under the current exhaust gas flow and the exhaust gas temperature in the SCR conversion efficiency pulse spectrum prestored in a vehicle post-processing system is read, and the first conversion efficiency threshold value is set to be smaller than the fault alarm threshold value of the emission overrun; the comparison module compares the first conversion efficiency with the first conversion efficiency threshold; when the first conversion efficiency is smaller than the first conversion efficiency threshold value, the control module controls the DPF to execute driving regeneration, and the SCR conversion efficiency of the vehicle aftertreatment system can be improved, namely the SCR conversion efficiency is reduced but NO does not appearxWhen the fault exceeds 1.2, the DPF is controlled to trigger an active regeneration function, so that the problem of low SCR conversion efficiency can be effectively solved, the occurrence of DPF overload blocking faults is reduced, the labor cost can be saved, and the economic benefit is improved.
Optionally, the obtaining module 100 is further configured to obtain a second conversion efficiency of the SCR device at the current exhaust gas flow and exhaust gas temperature again after controlling the DPF to perform active regeneration; the comparison module 200 is further configured to compare the second conversion efficiency threshold with a second conversion efficiency; the control module 300 is further configured to control the DPF to perform a second active regeneration when the second conversion efficiency is less than a second conversion efficiency threshold.
After the first DPF active regeneration is executed, the control module 100 further obtains a second conversion efficiency, the comparison module 200 further compares the second conversion efficiency with a second conversion efficiency threshold value to detect whether the SCR conversion efficiency is successfully recovered, and if the second conversion efficiency is greater than or equal to the second conversion efficiency threshold value, it indicates that the first DPF active regeneration successfully recovers the SCR conversion efficiency; if the second conversion efficiency is smaller than the second conversion efficiency threshold, which indicates that the SCR conversion efficiency is not recovered to the preset state by the first DPF active regeneration, the control module 300 is required to perform the second DPF active regeneration. The embodiment of the invention can improve the accuracy of the SCR conversion efficiency recovery method and further avoid NOxAnd (4) occurrence of emission over 1.2 fault and DPF overload blocking fault.
Optionally, the obtaining module 100 is further configured to obtain a third conversion efficiency of the SCR device at the current exhaust gas flow and the current exhaust gas temperature again after controlling the DPF to perform the second active regeneration; the comparison module 200 is further configured to compare the third conversion efficiency threshold with a third conversion efficiency; the control module 300 is further configured to determine that the SCR device is malfunctioning when the third conversion efficiency is less than a third conversion efficiency threshold.
After the second DPF active regeneration is performed, the obtaining module 100 may further obtain a third conversion efficiency, the comparing module 200 compares the third conversion efficiency with the second conversion efficiency threshold, if the third conversion efficiency is greater than or equal to the second conversion efficiency threshold, the comparison is completed, if the third conversion efficiency is still less than the second conversion efficiency threshold, the third conversion efficiency is compared with the third conversion efficiency threshold, and if the third conversion efficiency is less than the third conversion efficiency threshold, the control module 300 determines that the SCR device is faulty. The embodiment of the invention not only can effectively solve the problem of low SCR conversion efficiency and reduce the occurrence of DPF overload blocking faults, thereby saving the labor cost and improving the economic benefit, but also can improve the accuracy of the SCR conversion efficiency recovery method, and can judge whether the SCR device has faults or not in time, thereby facilitating the vehicle maintenance service.
On the basis of the embodiment, the embodiment of the invention also provides a vehicle. Fig. 6 is a schematic structural diagram of a vehicle according to an embodiment of the present invention. As shown in fig. 6, the vehicle 1 includes the SCR conversion efficiency recovery apparatus 10 provided in the above embodiment.
According to the vehicle provided by the embodiment of the invention, the first conversion efficiency of the SCR device under the current exhaust gas flow and the exhaust gas temperature is obtained, the first conversion efficiency threshold under the current exhaust gas flow and the exhaust gas temperature in the SCR conversion efficiency pulse spectrum prestored in the vehicle aftertreatment system is read, the first conversion efficiency threshold is compared with the first conversion efficiency threshold, and when the first conversion efficiency is smaller than the first conversion efficiency threshold, the DPF is controlled to execute active regeneration, so that the SCR conversion efficiency of the vehicle aftertreatment system can be improved, namely the SCR conversion efficiency is reduced but NO NO is generatedxWhen the fault exceeds 1.2, the DPF is controlled to trigger the active regeneration function, the problem of low SCR conversion efficiency can be effectively solved, the occurrence of the fault caused by DPF overload blockage is reduced, the labor cost can be saved, the vehicle maintenance service is facilitated, and the large market potential and the economic benefit are realized.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An SCR conversion efficiency recovery method for improving SCR conversion efficiency of a vehicle aftertreatment system, the vehicle aftertreatment system including a Selective Catalytic Reduction (SCR) device and a particulate trap (DPF), the vehicle aftertreatment system having an SCR conversion efficiency pulse spectrum prestored therein, the SCR conversion efficiency recovery method comprising:
acquiring first conversion efficiency of the SCR device under the current exhaust gas flow and the current exhaust gas temperature;
according to the SCR conversion efficiency pulse spectrum, comparing a first conversion efficiency threshold value and the first conversion efficiency in the SCR conversion efficiency pulse spectrum under the current exhaust gas flow and the exhaust gas temperature;
and if the first conversion efficiency is smaller than the first conversion efficiency threshold value, controlling the DPF to execute active regeneration.
2. The SCR conversion efficiency recovery method according to claim 1, further comprising, after controlling the DPF to perform active regeneration:
obtaining a second conversion efficiency of the SCR device under the current exhaust gas flow and the current exhaust gas temperature again;
comparing a second conversion efficiency threshold with the magnitude of the second conversion efficiency;
and if the second conversion efficiency is smaller than the second conversion efficiency threshold value, controlling the DPF to execute second active regeneration.
3. The SCR conversion efficiency recovery method according to claim 2, further comprising, after controlling the DPF to perform the second active regeneration:
obtaining the third conversion efficiency of the SCR device again under the current exhaust gas flow and the current exhaust gas temperature;
comparing a third conversion efficiency threshold to the magnitude of the third conversion efficiency;
and if the third conversion efficiency is smaller than the third conversion efficiency threshold value, judging that the SCR device is in fault.
4. The SCR conversion efficiency recovery method according to claim 1, wherein obtaining the first conversion efficiency of the SCR device at the current exhaust gas flow rate and exhaust gas temperature includes:
acquiring the concentration of nitrogen oxide at the upstream of the SCR device measured by an upstream nitrogen oxide sensor of the SCR device in a first time period;
acquiring the concentration of the downstream nitrogen oxides of the SCR device measured by a downstream nitrogen oxide sensor of the SCR device in the first time period;
and acquiring the first conversion efficiency according to the concentration of nitrogen oxides at the upstream of the SCR device and the concentration of nitrogen oxides at the downstream of the SCR device in the first time period.
5. The SCR conversion efficiency recovery method of claim 1, wherein the first conversion efficiency threshold is greater than an emissions overrun fault warning threshold.
6. The SCR conversion efficiency recovery method of claim 1, wherein the active regeneration is a drive train regeneration.
7. An SCR conversion efficiency recovery apparatus for improving SCR conversion efficiency of a vehicle aftertreatment system including a Selective Catalytic Reduction (SCR) device and a particulate trap (DPF), the vehicle aftertreatment system having an SCR conversion efficiency pulse spectrum prestored therein, the SCR conversion efficiency recovery apparatus comprising:
the acquisition module is used for acquiring the first conversion efficiency of the SCR device under the current exhaust gas flow and the current exhaust gas temperature;
the comparison module is used for comparing a first conversion efficiency threshold value and the first conversion efficiency in the SCR conversion efficiency pulse spectrum under the current exhaust gas flow and the exhaust gas temperature according to the SCR conversion efficiency pulse spectrum;
a control module to control the DPF to perform active regeneration when the first conversion efficiency is less than the first conversion efficiency threshold.
8. The SCR conversion efficiency recovery device of claim 7, wherein the obtaining module is further configured to obtain a second conversion efficiency of the SCR device at the current exhaust gas flow rate and exhaust gas temperature again after controlling the DPF to perform active regeneration;
the comparison module is further used for comparing a second conversion efficiency threshold value with the second conversion efficiency;
the control module is further configured to control the DPF to perform a second active regeneration when the second conversion efficiency is less than the second conversion efficiency threshold.
9. The SCR conversion efficiency recovery device according to claim 8, wherein the obtaining module is further configured to obtain a third conversion efficiency of the SCR device again at the current exhaust gas flow rate and exhaust gas temperature after controlling the DPF to perform the second active regeneration;
the comparison module is further used for comparing a third conversion efficiency threshold value with the third conversion efficiency;
the control module is further configured to determine that the SCR device is malfunctioning when the third conversion efficiency is less than the third conversion efficiency threshold.
10. A vehicle comprising the SCR conversion efficiency recovery device according to any one of claims 7 to 9.
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