CN108386259B - Method for realizing DPF accurate regeneration by monitoring carbon accumulation amount based on radio frequency technology - Google Patents
Method for realizing DPF accurate regeneration by monitoring carbon accumulation amount based on radio frequency technology Download PDFInfo
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- CN108386259B CN108386259B CN201810085508.4A CN201810085508A CN108386259B CN 108386259 B CN108386259 B CN 108386259B CN 201810085508 A CN201810085508 A CN 201810085508A CN 108386259 B CN108386259 B CN 108386259B
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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
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
- F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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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
- F01N2900/1611—Particle filter ash 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The invention relates to a method for monitoring carbon accumulation amount to realize accurate regeneration of a DPF based on a radio frequency technology, which comprises the steps of ① after the DPF is started, transmitting equal-radiation radio frequency signals of each frequency band into a cavity by an RF generator, transmitting the collected and changed RF signals to a controller by the RF receiver after ② passes through a DPF filter accumulated with soot particles, carrying out Fourier transform and circuit processing on the collected signals to obtain resonance frequency, determining carbon accumulation amount in the DPF by ③ by using the obtained resonance frequency, comparing the carbon accumulation amount with a preset regeneration starting threshold value according to the carbon accumulation amount, transmitting the equal-radiation radio frequency signals of each frequency band into the cavity by a ④ RF generator, transmitting the collected RF signals to the controller by a ⑤ RF receiver, carrying out Fourier transform and circuit processing on the collected signals to obtain the resonance frequency, determining carbon accumulation amount in the DPF by using ⑥ according to the obtained resonance frequency, and comparing the carbon accumulation amount with a regeneration ending threshold value.
Description
Technical Field
The invention relates to a method for accurately regenerating a DPF (diesel particulate filter), in particular to a method for realizing accurate regeneration of the DPF by monitoring carbon accumulation amount based on a radio frequency technology, and belongs to the technical field of waste gas treatment.
Background
A Particulate trap dpf (diesel Particulate filter) is a ceramic filter installed in the exhaust system of a diesel engine that traps Particulate emissions before they enter the atmosphere. The catalytic oxidizer DOC (diesel Oxidation catalyst) is installed in the exhaust pipeline of the engine and converts carbon monoxide (CO) and Hydrocarbon (HC) in the exhaust gas of the engine into harmless water (H) through Oxidation reaction2O) and carbon dioxide (CO)2) The apparatus of (1).
The DPF technology is an effective means for reducing the PM emission from the diesel engine, however, the main problems in the present regeneration process of the DPF are incomplete regeneration and damage of a filter, and the determination of the regeneration timing is essentially to determine whether the carbon accumulation in the DPF meets the regeneration requirement, and to determine when the regeneration system starts to operate. The regeneration is too early, the deposition quality of particles is too low, the continuous combustion temperature is too low, the flame is easily extinguished in the combustion process, and the regeneration is not thorough; the regeneration is too late, the quality of the particles is too much, and the DPF is damaged due to overheating during regeneration, so that the accurate judgment of the regeneration time has important significance for ensuring the safety of the regeneration.
In addition, when the regeneration time is accurately judged, the too high regeneration frequency for improving the fuel economy of the engine can increase the energy consumption of an after-treatment system to cause the fuel economy of the engine to be reduced, and when the regeneration frequency is too low, the exhaust back pressure is increased to cause the performance of the engine to be reduced and the oil consumption is increased due to the too much carbon accumulation in the trap. However, in the actual running process of a vehicle, the DPF regeneration control technology generally uses differential pressure sensor control, the carbon accumulation in the trap is directly measured without a method, the carbon accumulation is often indirectly measured by adopting front and back pressure differences, and the regeneration time is judged by means of a mathematical model. The short service life of the DPF is a great problem for limiting the popularization and the use of the DPF, and the DPF can be really popularized only by solving the problem, so that the policy of energy conservation and emission reduction is practically implemented.
Disclosure of Invention
The invention provides a method for realizing DPF accurate regeneration by monitoring carbon accumulation amount based on a radio frequency technology, which can realize accurate regeneration when the carbon accumulation amount in the DPF reaches a regeneration limit value, prevent the DPF from reducing the tail gas treatment effect caused by excessive carbon accumulation and prevent the occurrence of a discharge leakage phenomenon.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for realizing DPF accurate regeneration based on monitoring carbon accumulation amount by radio frequency technology comprises the following steps:
① after DPF is started, the RF generator transmits each frequency band constant amplitude radio frequency signal to enter the cavity;
② after passing through the DPF filter body accumulated with soot particles, the RF receiver transmits the collected changed RF signal to the controller, and performs Fourier transform and circuit processing on the collected signal to obtain resonance frequency;
③ referring to the resonance frequency-carbon accumulation curve obtained from the calibration experiment, determining the carbon accumulation in DPF by using the obtained resonance frequency, comparing the carbon accumulation with the regeneration start threshold calibrated in advance,
when the regeneration initiation threshold is lower, return to step ①;
when the regeneration starting threshold value is reached or higher than the regeneration starting threshold value, the controller transmits a starting signal to the regeneration device to start the DPF regeneration process;
④ the RF generator continues to work, the RF generator transmits each frequency band constant amplitude radio frequency signal to enter the cavity;
⑤ after passing through the DPF filter body accumulated with soot particles, the RF receiver transmits the collected changed RF signal to the controller, and performs Fourier transform and circuit processing on the collected signal to obtain resonance frequency;
⑥ referring to the resonance frequency-carbon accumulation curve obtained from the calibration experiment, determining the carbon accumulation in DPF by using the obtained resonance frequency, comparing the carbon accumulation with the regeneration termination threshold value calibrated in advance,
when the regeneration termination threshold value is reached or lower than the regeneration termination threshold value, the controller transmits a termination signal to the regeneration device, and the DPF regeneration process is finished;
when above the regeneration termination threshold, return to step ④.
Preferably, the constant amplitude radio frequency signal is in the range of 0.4-2.4 GHz.
Preferably, the method for obtaining the resonance frequency-carbon accumulation curve is as follows: after the equipment is connected to a diesel engine rack, a change curve of the carbon cumulant in the working time is obtained by utilizing the approximately linear relation between the carbon cumulant and the working time under the stable working condition of the diesel engine, the change curve of the resonant frequency in the working time is measured by utilizing the equipment, and the two curves are fitted together to obtain a calibrated resonant frequency-carbon cumulant curve. The device for realizing the accurate regeneration of the DPF by monitoring the carbon accumulation amount based on the radio frequency technology comprises: the device comprises a controller, an RF generator and an RF receiver, wherein the RF generator is used for acquiring an RF signal; the controller is respectively connected with the RF generator and the RF receiver and is used for measuring the carbon accumulation amount in the DPF filter body in real time based on the corresponding relation between the RF resonance frequency and the carbon accumulation amount; the controller is also connected to a regeneration device in the DPF, and when the carbon accumulation amount reaches a regeneration start threshold, the controller starts the regeneration device to perform regeneration. The regeneration device is used for oil injection regeneration, burns off the carbon particles adsorbed on the DPF filter body, and completes the active regeneration of the DPF.
The device and the method are designed based on the fact that when the soot accumulation amount of a filter body in the DPF is different, the Frequency of a Radio Frequency signal (RF) which resonates with the filter body through a cavity also has corresponding offset, and experiments show that the offset of the resonant Frequency and the mass concentration of soot particles have a certain one-to-one correspondence relationship. The applicability of the device is not affected by the working condition of the engine, so that the soot concentration of the DPF can be detected on line in real time.
Preferably, the controller comprises an RF processing module and a regeneration control module, the RF processing module performs fourier transform on a signal received by the RF receiver, converts the signal into an energy spectrum, performs smoothing on the energy spectrum curve to obtain a frequency corresponding to a peak value, that is, an RF resonance frequency, searches for a functional relationship between the obtained resonance frequency and a pre-stored RF resonance frequency and carbon accumulation to obtain carbon accumulation, and when a regeneration start threshold is reached, the regeneration control module sends a regeneration signal to control fuel injection regeneration.
Preferably, a regeneration device, a DOC, and a DPF filter are installed in the DPF system in this order from the inlet to the outlet, the RF generator is installed between the DOC and the DPF filter, and the RF receiver is installed behind the DPF filter.
Preferably, the regeneration start threshold is 12g, and the regeneration end threshold is 0.1 g. When the DPF carbon accumulation amount reached 15g, the DPF trapping efficiency had been seriously affected and caused a phenomenon of blow-by, so we set the regeneration start threshold to 12g and the regeneration end threshold to 0.1 g.
The invention has the beneficial effects that: the method can realize accurate regeneration when the carbon accumulation amount in the DPF reaches the regeneration limit value, prevent the DPF from reducing the tail gas treatment effect caused by excessive carbon accumulation, and prevent the occurrence of the phenomenon of discharge leakage; and different from the traditional differential pressure sensor, the regeneration finishing time is more accurately controlled, and the fuel consumption in the regeneration process can be reduced. Meanwhile, the method has the advantages of low operation cost, cost and consumption saving, easy implementation and wide application range.
Drawings
FIG. 1 is a diagram of a DPF system employing an RF sensor;
FIG. 2 is a flow chart of the operation of the RF sensor;
in the figure: the device comprises a regeneration device 1, a DOC2, an RF generator 3, a DPF filter body 4, an RF receiver 5 and a controller 6.
Detailed Description
The technical solution of the present invention is further specifically described below by way of specific examples in conjunction with the accompanying drawings. It is to be understood that the practice of the invention is not limited to the following examples, and that any variations and/or modifications may be made thereto without departing from the scope of the invention.
Example (b):
the DPF system shown in fig. 1 is installed with an apparatus for monitoring carbon accumulation amount based on radio frequency technology to realize DPF accurate regeneration, the apparatus comprising: a controller 6 (including an RF processing module and a regeneration control module), an RF generator 3, and an RF receiver 5. The DPF system is provided with a regeneration device 1, a DOC2, and a DPF filter 4 in this order from the intake to the exhaust direction, an RF generator 3 is provided between the DOC2 and the DPF filter 4, and an RF receiver 5 is provided behind the DPF filter 4. The RF generator is used for acquiring an RF signal; the controller is respectively connected with the RF generator and the RF receiver and is used for measuring the carbon accumulation amount in the DPF filter body in real time based on the corresponding relation between the RF resonance frequency and the carbon accumulation amount. The controller is also connected to the regeneration device 1 in the DPF for the purpose of starting the regeneration device for regeneration when the carbon accumulation amount reaches a regeneration start threshold. The regeneration device 1 is used for oil injection regeneration, and burns off carbon particles adsorbed on the DPF filter body to complete the active regeneration of the DPF.
The RF processing module performs Fourier transform on signals received by the RF receiver, converts the signals into an energy spectrum, smoothes an energy spectrum curve to obtain a frequency corresponding to a peak value, namely a resonant frequency, searches the obtained resonant frequency and a function relation between the pre-stored RF resonant frequency and carbon accumulation to obtain carbon accumulation, and when a regeneration starting threshold value is reached, the regeneration control module sends a regeneration signal to control oil injection regeneration.
The method for monitoring the carbon accumulation amount based on the radio frequency technology to realize the accurate regeneration of the DPF by utilizing the equipment comprises the following specific steps:
one) measuring method
The tail gas enters the DPF from the diesel engine through the communicating pipeline, after entering the DPF, the tail gas firstly passes through an oxidation type catalyst DOC2, carbon monoxide (CO) and Hydrocarbon (HC) are firstly processed, the tail gas processed by DOC2 enters a cavity between the DOC2 and the DPF filter body 4 and is continuously accumulated on the DPF filter body, the RF generator 3 respectively emits equal-amplitude radio frequency bands in various frequency bands of 0.4-2.4GHz into the cavity, after passing through the DPF filter body accumulated with soot particles, the RF signal is subjected to the absorption action of the soot particles, the signal accumulation characteristics are changed, the absorption action of different carbon accumulation amounts on the RF signal is different, and therefore the signal characteristics received on the RF receiver 5 are changed along with the difference of the carbon accumulation amounts.
The RF receiver 5 transmits the acquired modified RF signal to the controller and performs fourier transform on the acquired signal to convert into an energy spectrum. And calculating the part with the minimum energy attenuation in the processed energy spectrum, namely the frequency at the peak, and determining the carbon accumulation in the DPF according to the obtained frequency of the peak and by contrasting a resonance frequency-carbon accumulation curve obtained by a calibration experiment in advance. According to the comparison of the carbon accumulation amount and the lowest carbon accumulation amount (regeneration starting threshold) generated by regeneration, when the regeneration starting threshold is reached, a starting signal is given to the regeneration device 1, the regeneration process is generated, at the moment, the RF generator 3 continues to work, the RF generator 3 respectively emits equal-amplitude radio frequency bands in various frequency bands of 0.4-2.4GHz into the cavity along with the high-temperature oxidation of carbon smoke particles on the DPF filter body, the RF receiver 3 transmits the collected changed RF signals to the controller, and performs Fourier transform on the collected signals to convert the collected signals into an energy spectrum. And calculating the part with the minimum energy attenuation in the processed energy spectrum, namely the frequency at the peak, and determining the carbon accumulation in the DPF according to the obtained frequency of the peak and by contrasting a resonance frequency-carbon accumulation curve obtained by a calibration experiment in advance. The regeneration process is ended by giving a termination signal to the regeneration device 1 when a regeneration termination threshold value is reached, based on the comparison of the carbon accumulation amount with the carbon accumulation amount at the end of regeneration (regeneration termination threshold value).
II) calibration method
In the present invention, the RF signal in DPF is analyzed in the frequency domain of 0.4-2.4 GHz. The method for correlating the RF resonant frequency with the carbon accumulation in the DPF is determined by:
1. weighing the DPF filter body to obtain the mass of the DPF filter body which is not loaded with soot particles
And weighing the DPF filter body of the unloaded soot particles by using an electronic balance with a positive error and a negative error of 0.01g, and zeroing and cleaning the balance before weighing. And lightly placing the DPF filter body on an electronic balance, recording data after the reading is stable, repeatedly weighing for three times, and taking the average value of the three times of weighing as the mass of the DPF filter body.
2. And connecting the DPF with the DPF carbon accumulation amount measuring device to a tail gas discharge port of the diesel vehicle to load carbon smoke particles in the DPF.
3. And weighing the mass of the loaded DPF filter body, comparing the obtained value with the mass of the DPF filter body which is not loaded with soot particles to obtain the mass difference, and recording the mass difference value.
4. The RF generator 3 respectively emits radio frequency bands with equal amplitude of each frequency band into the DPF cavity loaded with soot particles for the first time.
5. And the RF receiver 5 in the DPF cavity transmits the RF signal to a spectrum analyzer, the spectrum analyzer is used for processing the RF signal, the RF signal is converted into an energy spectrum through Fourier transformation, the energy spectrum curve is smoothed to obtain the frequency corresponding to the peak value, namely the resonant frequency, and the resonant frequency is recorded and corresponds to the mass difference.
6. And connecting the DPF to a tail gas discharge port of the diesel vehicle again to carry out second loading on carbon smoke particles in the DPF.
7. Repeating the steps 4-5 to obtain the corresponding relation between the resonance frequency and the accumulated carbon amount.
Comparative experiment
This experiment adopts traditional DPF and has DPF carbon accumulation volume measuring equipment's DPF to carry out contrast control, compares its experiment result.
Wherein, the conventional DPF retains a pressure sensor and a temperature sensor,
in the DPF with a DPF carbon accumulation amount measuring device, an RF generator and an RF receiver are installed in the DPF, respectively in front of and behind a DPF filter. The DPF is installed on a 290F double-cylinder air-cooled diesel engine to carry out a comparison experiment of the measured value of the device and the actual carbon loading amount, the diesel engine is a vertical type, double-cylinder type, air-cooled type, four-stroke type and direct injection type diesel engine, and the experiment obtains the comparison of the measured value of the carbon accumulation amount of the traditional DPF and the DPF with DPF carbon accumulation amount measuring equipment and the error value of the actual carbon accumulation amount obtained by weighing with an electronic balance. Specific experimental data are shown in table 1.
TABLE 1
According to the experimental result, the accuracy of the carbon accumulation measured by the traditional DPF is 1.1g, which is similar to the accuracy of 1.5g in the case of the control by a pressure difference sensor, and the accuracy of the control reaches 0.1g in the case of the control by an RF sensor.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (4)
1. A method for realizing DPF accurate regeneration based on monitoring carbon accumulation amount by radio frequency technology is characterized by comprising the following steps:
① after DPF is started, the RF generator transmits each frequency band constant amplitude radio frequency signal to enter the cavity;
② after passing through the DPF filter body accumulated with soot particles, the RF receiver transmits the collected changed RF signal to the controller, and performs Fourier transform and circuit processing on the collected signal to obtain resonance frequency;
③ referring to the resonance frequency-carbon accumulation curve obtained from the calibration experiment, determining the carbon accumulation in DPF by using the obtained resonance frequency, comparing the carbon accumulation with the regeneration start threshold calibrated in advance,
when the regeneration initiation threshold is lower, return to step ①;
when the regeneration starting threshold value is reached or higher than the regeneration starting threshold value, the controller transmits a starting signal to the regeneration device to start the DPF regeneration process;
④ the RF generator continues to work, the RF generator transmits each frequency band constant amplitude radio frequency signal to enter the cavity;
⑤ after passing through the DPF filter body accumulated with soot particles, the RF receiver transmits the collected changed RF signal to the controller, and performs Fourier transform and circuit processing on the collected signal to obtain resonance frequency;
⑥ referring to the resonance frequency-carbon accumulation curve obtained from the calibration experiment, determining the carbon accumulation in DPF by using the obtained resonance frequency, comparing the carbon accumulation with the regeneration termination threshold value calibrated in advance,
when the regeneration termination threshold value is reached or lower than the regeneration termination threshold value, the controller transmits a termination signal to the regeneration device, and the DPF regeneration process is finished;
when above the regeneration termination threshold, return to step ④;
the method for obtaining the resonance frequency-carbon cumulative quantity curve comprises the following steps: after the equipment for monitoring the carbon cumulant based on the radio frequency technology to realize the accurate regeneration of the DPF is connected to a diesel engine rack, the change curve of the carbon cumulant in the working time is obtained by utilizing the approximately linear relation between the carbon cumulant and the working time under the stable working condition of the diesel engine, the change curve of the resonant frequency in the working time is measured by utilizing the equipment, and the two curves are fitted together to obtain a calibrated resonant frequency-carbon cumulant curve;
the apparatus comprises: the device comprises a controller, an RF generator and an RF receiver, wherein the RF generator is used for acquiring an RF signal; the controller is respectively connected with the RF generator and the RF receiver and is used for measuring the carbon accumulation amount in the DPF filter body in real time based on the corresponding relation between the RF resonance frequency and the carbon accumulation amount; the controller is also connected with a regeneration device in the DPF, and when the carbon accumulation amount reaches a regeneration starting threshold value, the controller starts the regeneration device to regenerate; the controller comprises an RF processing module and a regeneration control module, the RF processing module performs Fourier transform on signals received by the RF receiver, the signals are converted into an energy spectrum, the energy spectrum curve is subjected to smoothing processing, the frequency corresponding to a peak value is obtained, namely the RF resonance frequency, the obtained resonance frequency is searched for the functional relation between the pre-stored RF resonance frequency and the pre-stored carbon accumulation amount, the carbon accumulation amount is obtained, and when the regeneration start threshold value is reached, the regeneration control module sends a regeneration signal to control oil injection regeneration.
2. The method of claim 1, wherein: the range of the constant amplitude radio frequency signal is 0.4-2.4 GHz.
3. The method of claim 1, wherein: the regeneration start threshold was 12g, and the regeneration end threshold was 0.1 g.
4. The method of claim 1, wherein: the DPF system is internally provided with a regeneration device, a DOC and a DPF filter body in sequence from the air inlet direction to the air outlet direction, an RF generator is arranged between the DOC and the DPF filter body, and an RF receiver is arranged behind the DPF filter body.
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| GB2598254B (en) * | 2017-06-27 | 2022-08-10 | Cummins Emission Solutions Inc | Reductant deposit detection using a radiofrequency sensor |
| CN109386358B (en) * | 2017-08-14 | 2021-07-27 | 博世汽车柴油系统有限公司 | Integrated particulate matter sensor for diesel particulate matter filter |
| EP3530896B1 (en) * | 2018-02-27 | 2020-02-12 | Advanced Technology Emission Solutions Inc. | Emission control system with resonant frequency measurement and methods for use therewith |
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| KR100857630B1 (en) * | 2001-08-06 | 2008-09-08 | 사우쓰웨스트 리서치 인스티튜트 | Method and apparatus for testing catalytic converter durability |
| CN102203392B (en) * | 2008-11-03 | 2015-05-13 | 莱斯利·布朗伯格 | System and method for measuring retentate in filters |
| US8650857B2 (en) * | 2009-01-16 | 2014-02-18 | GM Global Technology Operations LLC | Apparatus and method for onboard performance monitoring of exhaust gas particulate filter |
| US20110265456A1 (en) * | 2010-04-29 | 2011-11-03 | Caterpillar, Inc. | Diesel Engine and Method for Flexible Passive Regeneration of Exhaust After-Treatment Devices |
| US8942887B2 (en) * | 2010-12-16 | 2015-01-27 | Caterpillar Inc. | Machine, exhaust particulate filter system, and method |
| GB201306613D0 (en) * | 2013-04-11 | 2013-05-29 | Perkins Engine Company Ltd | Emissions cleaning module |
-
2016
- 2016-05-11 CN CN201610309409.0A patent/CN105927340B/en active Active
- 2016-05-11 CN CN201810085508.4A patent/CN108386259B/en active Active
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| Publication number | Publication date |
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| CN105927340A (en) | 2016-09-07 |
| CN108386259A (en) | 2018-08-10 |
| CN105927340B (en) | 2018-05-25 |
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