CN113339109A - Method for detecting and purifying trapping amount of automobile particle trap - Google Patents

Method for detecting and purifying trapping amount of automobile particle trap Download PDF

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Publication number
CN113339109A
CN113339109A CN202110769517.7A CN202110769517A CN113339109A CN 113339109 A CN113339109 A CN 113339109A CN 202110769517 A CN202110769517 A CN 202110769517A CN 113339109 A CN113339109 A CN 113339109A
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China
Prior art keywords
valve
pipe
particle
exhaust
signal input
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Granted
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CN202110769517.7A
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Chinese (zh)
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CN113339109B (en
Inventor
刘海峰
张晓腾
王灿
尧命发
郑尊清
王浒
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Tianjin University
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Tianjin University
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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
    • 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
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • 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
    • 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
    • F01N3/0232—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 removing incombustible material from a particle filter, e.g. ash
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
    • 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)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention discloses a method for detecting and purifying the trapping amount of an automobile particle trap, which detects the temperature difference and the pressure difference before and after the particle trap through a temperature sensor and a pressure sensor before and after the particle trap, and if any one group exceeds a preset threshold, a purification program is started: the cleaning agent in the cleaning agent box is pumped by the cleaning water pump and atomized and sprayed into the particle catcher through the atomizing spray head, the ultrasonic generator is started at the same time, under the action of ultrasonic waves, carbon-containing particles on the inner wall of the particle catcher are peeled off and dissolved in the cleaning agent, then clean water in the water box is pumped by the pressurizing water pump to wash the particle catcher body through the nozzle, after the washing is finished, high-temperature air flow which is compressed by the air compressor and heated by the heating box flows to the particle catcher through the backflushing pipe to carry out carbon-containing particle backflushing and dry the particle catcher.

Description

Method for detecting and purifying trapping amount of automobile particle trap
Technical Field
The invention relates to a method for detecting and purifying vehicle exhaust emission, in particular to a method for detecting and purifying the trapping amount of an automobile particulate trap.
Background
At present, for the treatment of carbon-containing particles in exhaust gas, a particle trap is generally adopted, ash substances in the particle trap refer to non-combustible substances in exhaust particles, the ash substances are accumulated in a filter body pore channel along with the circulation of a regeneration process to block the particle trap, the ash substances are main influence factors for limiting the service life of the particle trap, the filter body pore channel can be blocked by the ash substances continuously accumulated in the particle trap, in addition, a dense ash layer can be formed on the wall surface pore channel and the tail end of an inlet of the filter body by the continuously accumulated ash, the working performance of the particle trap and an engine is deteriorated, such as increasing the pressure loss of the particle trap, reducing the power performance and the economical efficiency of the engine and the like, and the existing detection device for detecting the amount of the particle trap and the purification method are single in detection method, false detection is easy to occur, and carbon-containing particles attached in the particle trap, the purification effect is not obvious.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for detecting and purifying the trapping amount of an automobile particle trap, which has high detection accuracy, can efficiently remove carbon-containing particles attached to the interior of the particle trap and has obvious purification effect.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention discloses a method for detecting and purifying the trapping amount of an automobile particle trap, which comprises the following steps:
step one, the particle trap in the existing automobile exhaust aftertreatment system and the matching structure thereof are improved, the improved structure comprises a particle trap body, an air inlet of the particle trap body is fixedly connected with one end of an air inlet pipe through an air inlet valve, the other end of the air inlet pipe is fixedly connected with an exhaust pipe of an engine, the bottom of an exhaust port end of the particle trap body is fixedly connected with one end of an air outlet pipe through an exhaust valve, a first temperature sensor and a first pressure sensor are respectively arranged on the inner wall of the air inlet pipe close to the particle trap body, the bottom of the air inlet pipe is communicated with one end of an exhaust pipe through an exhaust valve, the other end of the exhaust pipe is fixedly connected with an inlet of an exhaust fan fixed at the bottom of the air inlet pipe through a bracket, a first filter element is arranged in the exhaust pipe, and a second temperature sensor and a second pressure sensor are respectively arranged on the inner wall of the air outlet pipe close to one side of the exhaust valve, a second filter element, a third filter element and a fourth filter element are sequentially arranged in the air outlet pipe from left to right;
the top of one side of an exhaust port of the particle catcher body is fixedly connected with one end of a back flushing pipe, and the other end of the back flushing pipe is sequentially connected with a back flushing valve, a heating box and an air compressor; a plurality of nozzles and spray heads are annularly arranged on the inner wall of the exhaust port end of the particle catcher body, and each nozzle is connected with a booster water pump arranged in the water tank through a water pipe provided with a nozzle valve; each spray head is connected with a cleaning water pump arranged in a cleaning agent box through a cleaning agent water pipe provided with a spray valve, the ultrasonic generator is communicated with the side wall of one side of the exhaust port of the particle trap body through an ultrasonic pipe provided with an ultrasonic valve, and the air compressor, the ultrasonic generator, the cleaning agent box and the water tank are all fixed at the bottom of the automobile;
a groove is formed below the particle trap body and is fixedly connected with a sewage tank through a sewage tank water pipe provided with a sewage tank valve, the sewage tank is fixed at the bottom of the automobile, a carbon-containing particle detector is arranged on the inner wall of the sewage tank water pipe close to one side of the particle trap body, and an alarm is arranged in the automobile;
the signal output ends of the first temperature sensor, the first pressure sensor, the second temperature sensor and the second pressure sensor are all connected with the signal input end of an ECU control unit through control lines, and the signal output end of the ECU control unit is respectively connected with the signal input end of an exhaust fan, the signal input end of an air compressor, the signal input end of a heating plate, the signal input end of an ultrasonic generator, the signal input end of a cleaning water pump, the signal input end of a spray valve, the signal input end of an ultrasonic valve, the signal input end of a recoil valve, the signal input end of a nozzle valve, the signal input end of a booster water pump, the signal input end of an air suction valve, the signal input end of an exhaust valve, the signal input end of a sewage tank valve, the signal input end of an air inlet valve and the signal input end of an alarm through control lines;
step two, after the regeneration and purification of the particle trap body are finished, the temperature and the pressure of an air inlet and an air outlet of the particle trap are monitored in real time through the first temperature sensor, the first pressure sensor, the second temperature sensor and the second pressure sensor, numerical values are transmitted to the ECU, the ECU subtracts the temperature value output by the first temperature sensor from the temperature value output by the second temperature sensor to obtain a temperature change value delta T, subtracts the pressure value output by the first pressure sensor from the pressure value output by the second pressure sensor to obtain a pressure change value delta P, and then whether the temperature change value delta T and the pressure change value delta P exceed a specified temperature difference threshold value T or not is judgedmaxAnd a pressure difference threshold value PmaxIf any one of the values of DeltaT and DeltaP exceeds a predetermined temperature difference threshold TmaxOr a pressure difference threshold value PmaxIf the particle trap body is cleaned, the ECU control unit controls an alarm in the automobile to give an alarm to remind a driver of preparing to stop the automobile for cleaning the particle trap body, and the driver can also choose to continue driving;
step three, during purification, a driver stops the vehicle, and the ECU starts purification process control, wherein the process is as follows: the ECU control unit outputs closing control signals to the backflushing valve, the water tank valve, the air suction valve, the exhaust valve, the sewage tank valve and the air inlet valve, then outputs opening signals to the spray valve, outputs starting signals to the cleaning water pump, the cleaning water pump pumps cleaning agent in the cleaning agent tank to spray the cleaning agent into the particle trap body through the atomization of the spray head, then controls the ultrasonic wave valve to open, the ultrasonic wave generator starts, under the action of ultrasonic waves, the cleaning agent generates cavitation, continuously impacts carbon-containing particles attached to the inner wall of the particle trap body, so that the carbon-containing particles are peeled off and dissolved in the cleaning agent, and the process is maintained for more than 35 minutes;
fourthly, controlling the ultrasonic generator and the cleaning water pump to stop working through the ECU control unit, closing the spray valve and the ultrasonic valve, then controlling the valve of the sewage tank and the valve of the nozzle to open, starting the booster water pump, pumping clean water in the water tank by the booster water pump, throttling and accelerating through the nozzle to wash the particle catcher body, so that the cleaning agent containing the peeled carbon-containing particles is cleaned, monitoring the carbon-containing particle amount M contained in the sewage in real time by the carbon-containing particle detector positioned on the inner wall of the water pipe of the sewage tank, and when the carbon-containing particle amount is lower than a preset value MlimWhen the sewage flows out, the booster water pump and the nozzle valve are closed, and the sewage tank valve is closed after the sewage is kept stand for a period of time;
opening a backflushing valve, an exhaust valve and an air inlet valve through an ECU control unit, driving an exhaust fan, an air compressor and a heating box to work, compressing external air by the air compressor, heating the air by the heating box, back-blowing residual carbon-containing particles which are not cleaned up to blow the air inlet pipe and blow the interior of the particle trap body dry by high-pressure hot gas flowing through the backflushing pipe, and exhausting mixed air which is pumped into the air exhaust pipe by the exhaust fan through the air inlet pipe and filtered by a first filter element;
and sixthly, after blowing and exhausting for ten minutes, closing the exhaust fan, the air compressor and the heating box through the ECU, closing a recoil valve on the recoil pipe and an exhaust valve on the exhaust pipe at the moment, opening an exhaust valve on the exhaust pipe, starting the vehicle, detecting the temperature and pressure changes of the air inlet and the air outlet through the first temperature sensor, the first pressure sensor, the second temperature sensor and the second pressure sensor, subtracting the temperature value output by the first temperature sensor from the temperature value output by the second temperature sensor by the ECU, obtaining a temperature change value delta T, subtracting the pressure value output by the first pressure sensor from the pressure value output by the second pressure sensor, obtaining a pressure change value delta P, wherein the temperature change value delta T and the pressure change value delta P do not exceed the specified valuesTemperature difference threshold value T ofmaxAnd a pressure difference threshold value PmaxAnd if the purification is finished, repeating the third step to the sixth step.
The invention has the following beneficial effects:
(1) the carbon-containing particles attached to the inside of the particle trap body can be accurately detected by the aid of the first temperature sensor, the first pressure sensor, the second temperature sensor and the second pressure sensor through double detection measures, missing detection is avoided, the temperature and the pressure of the air inlet and the air outlet are detected by the first temperature sensor, the first pressure sensor, the second temperature sensor and the second pressure sensor, the numerical values are transmitted to the ECU and displayed on the display screen, the ECU compares temperature difference data and pressure difference data with a specified threshold value, if any one group of numerical values of the temperature difference data and the pressure difference data exceeds a standard, the ECU controls the alarm in the vehicle to work to remind a driver of preparing to stop the vehicle to purify the particle trap body, and the driver can select to continue driving according to own needs.
(2) The invention arranges the exhaust pipe, the exhaust fan, the back flushing pipe, the air compressor, the ultrasonic generator, the cleaning agent box, the water tank and the sewage box, the carbon-containing particles attached in the particle catcher body can be completely removed through multiple purification measures, the carbon-containing particles attached to the inner wall of the trap pore channel are peeled off under the action of cavitation and dissolved in the cleaning agent through the matching of ultrasonic waves and the cleaning agent, then the exhaust fan and the air compressor are controlled to operate, after the air compressor compresses the external air, the high-pressure airflow reaches the inner pore channel of the particle catcher body through the backflushing pipe, carry out the blowback to the particle trap body, blow to the intake pipe with carbonaceous granule, dry the particle trap body simultaneously, this moment the air exhauster will mix the air and take out to the exhaust pipe in by the intake pipe, discharge after first filter core filters, can high-efficiently get rid of the inside adnexed carbonaceous granule of particle trap.
(3) According to the particle trap, the second filter element, the third filter element, the fourth filter element and the flat U-shaped air outlet pipe are arranged, so that tail gas flowing out of the particle trap body can be further purified, the contact time between the tail gas speed reduction and the filter elements is longer due to the flat U-shaped design, and the purification effect is better.
Drawings
FIG. 1 is a front sectional view illustrating an overall structure of a device for detecting a trapping amount of a particulate trap for an automobile according to the present invention;
FIG. 2 is an enlarged view of the structure of FIG. 1 at A according to the present invention;
FIG. 3 is a schematic block diagram of a method for detecting the trapping amount of an automotive particulate trap according to the present invention;
FIG. 4 is a flowchart of a system for detecting the trapping amount of a particle trap and a cleaning method according to the present invention.
The reference numbers in the figures are: 1. a particle trap body; 2. an air inlet pipe; 3. an engine; 4. a first temperature sensor; 5. a first pressure sensor; 6. an air exhaust pipe; 7. a first filter element; 8. an exhaust fan; 9. a support; 10. an air outlet pipe; 11. a second temperature sensor; 12. a second pressure sensor; 13. a second filter element; 14. a third filter element; 15. a fourth filter element; 16. back flushing the pipe; 17. an air compressor; 18. a heating box; 19. a heating plate; 20. an ultrasonic generator; 21. a cleaning agent box; 22. an ultrasonic tube; 23. a cleaning agent water pipe; 24. cleaning the water pump; 25. a spray head; 26. a spray valve; 27. an ultrasonic valve; 28. a back-flushing valve; 29. a nozzle valve; 30. a booster water pump; 31. a water pipe; 32. a water tank; 33. a nozzle; 34. an air extraction valve; 35. an exhaust valve; 36. a sewage tank water pipe; 37. a waste tank valve; 38. a sewage tank; 39. a carbonaceous particle detector; 40. an intake valve; 41. an ECU control unit; 42. an alarm.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The existing automobile part is sequentially provided with the following structures according to exhaust processes: the invention relates to an improved automobile exhaust pipe, which comprises an engine 3, an air inlet pipe 2 (connected with an exhaust pipe of the engine), an air inlet valve 40, a particle catcher body 1, an exhaust valve 35 and an air outlet pipe 10.
As shown in fig. 1 to 4, the present invention provides a technical solution:
a method for detecting and purifying the trapping amount of an automobile particle catcher comprises the following steps:
step one, the particle trap and the matching structure thereof in the existing automobile exhaust aftertreatment system are improved, the improved structure comprises a particle trap body 1, an air inlet of the particle trap body 1 is fixedly connected with one end of an air inlet pipe 2 through an air inlet valve 40, the other end of the air inlet pipe 2 is fixedly connected with an exhaust pipe of an engine 3, a first temperature sensor 4 and a first pressure sensor 5 are respectively arranged on the inner wall of the air inlet pipe 2 close to the particle trap body 1, the bottom of the air inlet pipe 2 is communicated with one end of an exhaust pipe 6 through an exhaust valve 34, the other end of the exhaust pipe 6 is fixedly connected with an inlet of an exhaust fan 8 fixed at the bottom of the air inlet pipe 2 through a bracket 9, a first filter element 7 is installed in the exhaust pipe 6, the first filter element 7 can be fixed in the exhaust pipe 6 through a flange, the bottom of an exhaust port end of the particle trap body 1 is fixedly connected with one end of an air outlet pipe 10 through an exhaust valve 35, the inner wall of the air outlet pipe 10 close to one side of the exhaust valve 35 is respectively provided with a second temperature sensor 11 and a second pressure sensor 12, and a second filter element 13, a third filter element 14 and a fourth filter element 15 are sequentially arranged in the air outlet pipe 10 from left to right.
Preferably, outlet duct 10 sets up to flat U type, second filter core 13, third filter core 14 and fourth filter core 15 can fix in outlet duct 10 through the flange, third filter core 14 set up in the cavity position department of U type outlet duct 10, through the outlet duct 10 that sets up second filter core 13, third filter core 14, fourth filter core 15 and flat U type for the tail gas that flows from particle trap body 1 can further purify, the design of flat U type makes the tail gas speed slow down longer with the contact time of filter core, purifying effect is better.
The top of one side of an exhaust port of the particle catcher body 1 is fixedly connected with one end of a recoil pipe 16, and the other end of the recoil pipe 16 is sequentially connected with a recoil valve 28, a heating box 18 and an air compressor 17. In one embodiment of the present invention, a plurality of heating fins 19 are provided at equal intervals in the heating box 18.
A plurality of nozzles 33 and spray heads 25 are annularly arranged on the inner wall of the air outlet end of the particle catcher body 1, and each nozzle 33 is connected with a booster water pump 30 arranged in a water tank 32 through a water pipe 31 provided with a nozzle valve 29; each spray head 25 is connected with a cleaning water pump 24 arranged in the cleaning agent box 21 through a cleaning agent water pipe 23 provided with a spray valve 26, and the ultrasonic generator 20 is communicated with the side wall of one side of the exhaust port of the particle catcher body 1 through an ultrasonic pipe 22 provided with an ultrasonic valve 27. The air compressor 17, the ultrasonic generator 20, the cleaning agent box 21 and the water tank 32 are all fixed at the bottom of the automobile.
A groove is arranged below the particle catcher body 1, the groove is fixedly connected with a sewage tank 38 through a sewage tank water pipe 36 provided with a sewage tank valve 37, the sewage tank 38 is fixed at the bottom of the automobile, a carbon-containing particle detector 39 is arranged on the inner wall of the sewage tank water pipe 36 close to one side of the particle catcher body 1, and an alarm 42 is arranged in the automobile.
The signal output ends of the first temperature sensor 4, the first pressure sensor 5, the second temperature sensor 11 and the second pressure sensor 12 are all connected with the signal input end of the ECU control unit 41 through control lines, the signal output end of the ECU control unit 41 is connected to the signal input end of the exhaust fan 8, the signal input end of the air compressor 17, the signal input end of the heating plate 19, the signal input end of the ultrasonic generator 20, the signal input end of the cleaning water pump 24, the signal input end of the spray valve 26, the signal input end of the ultrasonic valve 27, the signal input end of the recoil valve 28, the signal input end of the nozzle valve 29, the signal input end of the booster water pump 30, the signal input end of the suction valve 34, the signal input end of the exhaust valve 35, the signal input end of the sewage tank valve 37, the signal input end of the intake valve 40, and the signal input end of the alarm 42 through control lines.
The parts of the device not involved are the same as or can be implemented using prior art.
Secondly, after the regeneration and purification of the particle trap body 1 are finished, the temperature and the pressure of an air inlet and an air outlet of the particle trap are monitored in real time through the first temperature sensor 4, the first pressure sensor 5, the second temperature sensor 11 and the second pressure sensor 12, numerical values are transmitted to the ECU control unit 41, the ECU control unit 41 subtracts the temperature value output by the first temperature sensor from the temperature value output by the second temperature sensor to obtain a temperature change value delta T, subtracts the pressure value output by the first pressure sensor from the pressure value output by the second pressure sensor to obtain a pressure change value delta P, and then whether the temperature change value delta T and the pressure change value delta P exceed a specified temperature difference threshold value T or not is judgedmaxAnd a pressure difference threshold value PmaxIf any one of the values of DeltaT and DeltaP exceeds a predetermined temperature difference threshold TmaxOr a pressure difference threshold value PmaxIf so, the ECU control unit 41 controls the alarm 42 in the vehicle to give an alarm to remind the driver to prepare to stop the vehicle for cleaning the particulate trap body 1, and the driver can also choose to continue driving;
step three, during purification, the driver stops the vehicle, and the ECU control unit 41 starts purification process control, the process being as follows: the ECU control unit 41 outputs closing control signals to the recoil valve 28, the water tank valve 29, the suction valve 34, the exhaust valve 35, the sewage tank valve 37 and the air inlet valve 40, then outputs opening signals to the spray valve 26 and outputs starting signals to the cleaning water pump 24, the cleaning water pump 24 pumps cleaning agents in the cleaning agent tank 21 and sprays the cleaning agents into the particle trap body 1 through the atomization head 25 in an atomized manner, then controls the ultrasonic valve 27 to be opened, the ultrasonic generator 20 is started, under the action of ultrasonic waves, the cleaning agents generate cavitation, and continuously impact carbon-containing particles attached to the inner wall of the particle trap body 1 to be peeled off and dissolved in the cleaning agents, and the process is maintained for more than 35 minutes;
step four, the ECU control unit 41 controls the ultrasonic generator 20 and the cleaning water pump 24 to stop working, the spraying valve 26 and the ultrasonic valve 27 are closed, then the sewage tank valve 37 and the nozzle valve 29 are controlled to be opened, the booster water pump 30 is started, and the booster water pump 30 pumps clean water in the water tank 32 to pass throughThe particle catcher body 1 is washed by throttling and accelerating the nozzle 33, so that the cleaning agent containing the peeled carbon-containing particles is cleaned, the carbon-containing particle detector 39 positioned on the inner wall of the sewage tank water pipe 36 monitors the carbon-containing particle amount M contained in the sewage in real time, and when the carbon-containing particle amount is lower than a preset value MlimAt this time, the booster pump 30 and the nozzle valve 29 are closed, and the sewage tank valve 37 is closed after the standing for a certain period of time to allow the sewage to flow out.
Step five, opening a backflushing valve 28, an exhaust valve 34 and an air inlet valve 40 through an ECU (electronic control unit) control unit 41, driving an exhaust fan 8, an air compressor 17 and a heating box 18 to work, compressing external air by the air compressor 17, heating the air by the heating box 18, backflushing the particle trap body 1 by high-pressure hot air flowing through a backflushing pipe 16, blowing residual carbon-containing particles which are not cleaned to an air inlet pipe 2 and drying the interior of the particle trap body 1, and at the moment, pumping mixed air into an exhaust pipe 6 through the air inlet pipe 2 by the exhaust fan 8, filtering the mixed air by a first filter element 7 and then exhausting the mixed air;
step six, after blowing and air draft are carried out for ten minutes, the exhaust fan 8, the air compressor 17 and the heating box 18 are closed through the ECU control unit 41, the recoil valve 28 on the recoil pipe 16 and the air draft valve 34 on the air draft pipe 6 are closed at the moment, the exhaust valve 35 on the air outlet pipe 10 is opened, the vehicle is started, the temperature and pressure changes of the air inlet and the air outlet are detected through the first temperature sensor 4, the first pressure sensor 5, the second temperature sensor 11 and the second pressure sensor 12, the ECU control unit 41 subtracts the temperature value output by the first temperature sensor from the temperature value output by the second temperature sensor to obtain a temperature change value delta T1, and subtracts the pressure value output by the first pressure sensor from the pressure value output by the second pressure sensor to obtain a pressure change value delta P1, wherein the temperature change value delta T1 and the pressure change value delta P1 do not exceed a specified temperature difference threshold value T1maxAnd a pressure difference threshold value PmaxAnd if the purification is finished, repeating the third step to the sixth step.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (3)

1. A method for detecting and purifying the trapping amount of an automobile particle catcher is characterized by comprising the following steps:
step one, a particle trap in the existing automobile exhaust aftertreatment system and a matching structure thereof are improved, the improved structure comprises a particle trap body (1), an air inlet of the particle trap body is fixedly connected with one end of an air inlet pipe (2) through an air inlet valve (40), the other end of the air inlet pipe is fixedly connected with an exhaust pipe of an engine (3), the bottom of an exhaust port end of the particle trap body is fixedly connected with one end of an air outlet pipe (10) through an exhaust valve (35), a first temperature sensor (4) and a first pressure sensor (5) are respectively arranged on the inner wall of the air inlet pipe close to the particle trap body, the bottom of the air inlet pipe is communicated with one end of an exhaust pipe (6) through an exhaust valve (34), and the other end of the exhaust pipe is fixedly connected with an inlet of an exhaust fan (8) fixed at the bottom of the air inlet pipe through a support (9), a first filter element (7) is installed in the exhaust pipe, a second temperature sensor (11) and a second pressure sensor (12) are respectively arranged on the inner wall of an exhaust pipe (10) close to one side of an exhaust valve (35), and a second filter element (13), a third filter element (14) and a fourth filter element (15) are sequentially arranged in the exhaust pipe from left to right;
the top of one side of an exhaust port of the particle catcher body is fixedly connected with one end of a recoil pipe (16), and the other end of the recoil pipe is sequentially connected with a recoil valve (28), a heating box (18) and an air compressor (17); a plurality of nozzles (33) and spray heads (25) are annularly arranged on the inner wall of the air outlet end of the particle catcher body, and each nozzle is connected with a booster water pump (30) arranged in a water tank (32) through a water pipe (31) provided with a nozzle valve (29); each spray head (25) is connected with a cleaning water pump (24) arranged in a cleaning agent box (21) through a cleaning agent water pipe (23) provided with a spray valve (26), an ultrasonic generator (20) is communicated with the side wall of one side of the exhaust port of the particle trap body through an ultrasonic pipe (22) provided with an ultrasonic valve (27), and the air compressor, the ultrasonic generator, the cleaning agent box and the water tank are all fixed at the bottom of the automobile;
a groove is arranged below the particle catcher body and is fixedly connected with a sewage tank (38) through a sewage tank water pipe provided with a sewage tank valve, the sewage tank is fixed at the bottom of the automobile, a carbon-containing particle detector (39) is arranged on the inner wall of the sewage tank water pipe (36) close to one side of the particle catcher body, and an alarm (42) is arranged in the automobile;
the signal output ends of the first temperature sensor, the first pressure sensor, the second temperature sensor and the second pressure sensor are all connected with the signal input end of an ECU control unit through control lines, and the signal output end of the ECU control unit is respectively connected with the signal input end of an exhaust fan, the signal input end of an air compressor, the signal input end of a heating plate, the signal input end of an ultrasonic generator, the signal input end of a cleaning water pump, the signal input end of a spray valve, the signal input end of an ultrasonic valve, the signal input end of a recoil valve, the signal input end of a nozzle valve, the signal input end of a booster water pump, the signal input end of an air suction valve, the signal input end of an exhaust valve, the signal input end of a sewage tank valve, the signal input end of an air inlet valve and the signal input end of an alarm through control lines;
step two, after the regeneration and purification of the particle catcher body are finished, the particle catcher inlet is monitored in real time through the first temperature sensor, the first pressure sensor, the second temperature sensor and the second pressure sensorThe temperature and pressure of the air port and the air outlet are transmitted to an ECU control unit, the ECU control unit subtracts the temperature value output by the first temperature sensor from the temperature value output by the second temperature sensor to obtain a temperature change value delta T and subtracts the pressure value output by the first pressure sensor from the pressure value output by the second pressure sensor to obtain a pressure change value delta P, and then whether the temperature change value delta T and the pressure change value delta P exceed a specified temperature difference threshold value T or not is judgedmaxAnd a pressure difference threshold value PmaxIf any one of the values of DeltaT and DeltaP exceeds a predetermined temperature difference threshold TmaxOr a pressure difference threshold value PmaxIf the particle trap body is cleaned, the ECU control unit controls an alarm in the automobile to give an alarm to remind a driver of preparing to stop the automobile for cleaning the particle trap body, and the driver can also choose to continue driving;
step three, during purification, a driver stops the vehicle, and the ECU starts purification process control, wherein the process is as follows: the ECU control unit outputs closing control signals to the backflushing valve, the water tank valve, the air suction valve, the exhaust valve, the sewage tank valve and the air inlet valve, then outputs opening signals to the spray valve, outputs starting signals to the cleaning water pump, the cleaning water pump pumps cleaning agent in the cleaning agent tank to spray the cleaning agent into the particle trap body through the atomization of the spray head, then controls the ultrasonic wave valve to open, the ultrasonic wave generator starts, under the action of ultrasonic waves, the cleaning agent generates cavitation, continuously impacts carbon-containing particles attached to the inner wall of the particle trap body, so that the carbon-containing particles are peeled off and dissolved in the cleaning agent, and the process is maintained for more than 35 minutes;
fourthly, controlling the ultrasonic generator and the cleaning water pump to stop working through the ECU control unit, closing the spray valve and the ultrasonic valve, then controlling the valve of the sewage tank and the valve of the nozzle to open, starting the booster water pump, pumping clean water in the water tank by the booster water pump, throttling and accelerating through the nozzle to wash the particle catcher body, so that the cleaning agent containing the peeled carbon-containing particles is cleaned, monitoring the carbon-containing particle amount M contained in the sewage in real time by the carbon-containing particle detector positioned on the inner wall of the water pipe of the sewage tank, and when the carbon-containing particle amount is lower than a preset value MlimIn the process, the booster water pump and the nozzle valve are closed, and the mixture is stoodClosing a valve of the sewage tank after the sewage is drained in a certain period of time;
opening a backflushing valve, an exhaust valve and an air inlet valve through an ECU control unit, driving an exhaust fan, an air compressor and a heating box to work, compressing external air by the air compressor, heating the air by the heating box, back-blowing residual carbon-containing particles which are not cleaned up to blow the air inlet pipe and blow the interior of the particle trap body dry by high-pressure hot gas flowing through the backflushing pipe, and exhausting mixed air which is pumped into the air exhaust pipe by the exhaust fan through the air inlet pipe and filtered by a first filter element;
and sixthly, after blowing and exhausting for ten minutes, closing the exhaust fan, the air compressor and the heating box through the ECU, closing a recoil valve on the recoil pipe and an exhaust valve on the exhaust pipe at the moment, opening an exhaust valve on the exhaust pipe, starting the vehicle, detecting the temperature and pressure changes of the air inlet and the air outlet through the first temperature sensor, the first pressure sensor, the second temperature sensor and the second pressure sensor, subtracting the temperature value output by the first temperature sensor from the temperature value output by the second temperature sensor by the ECU to obtain a temperature change value delta T, subtracting the pressure value output by the first pressure sensor from the pressure value output by the second pressure sensor to obtain a pressure change value delta P, wherein the temperature change value delta T and the pressure change value delta P do not exceed a specified temperature difference threshold value TmaxAnd a pressure difference threshold value PmaxAnd if the purification is finished, repeating the third step to the sixth step.
2. The method for detecting and purifying the amount of collected particulate matter in an automobile particulate trap according to claim 1, wherein: the outlet duct set up to flat U type, second filter core, third filter core and fourth filter core pass through the flange and fix in the outlet duct, the third filter core set up the cavity position department at U type outlet duct.
3. The method for detecting and purifying the amount of collected particulate matter in an automobile particulate trap according to claim 1 or 2, wherein: a plurality of heating sheets are arranged in the heating box at equal intervals.
CN202110769517.7A 2021-07-07 2021-07-07 Method for detecting and purifying trapping amount of automobile particle trap Active CN113339109B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03199614A (en) * 1989-12-27 1991-08-30 Nissan Motor Co Ltd Exhaust gas cleaner for engine
CN105569781A (en) * 2015-12-03 2016-05-11 武汉华威专用汽车检测有限责任公司 Vehicle-mounted ash removing system for diesel particulate filter and control method of vehicle-mounted ash removing system
CN107420159A (en) * 2017-05-19 2017-12-01 昆明理工大学 A kind of grain catcher regenerating unit and its control method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03199614A (en) * 1989-12-27 1991-08-30 Nissan Motor Co Ltd Exhaust gas cleaner for engine
CN105569781A (en) * 2015-12-03 2016-05-11 武汉华威专用汽车检测有限责任公司 Vehicle-mounted ash removing system for diesel particulate filter and control method of vehicle-mounted ash removing system
CN107420159A (en) * 2017-05-19 2017-12-01 昆明理工大学 A kind of grain catcher regenerating unit and its control method

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