Tail gas treatment system based on particle collecting device and control method thereof

Abstract

The invention provides a tail gas treatment system based on a particle collecting device and a control method of the tail gas treatment system. The system comprises an SCR catalyst, a diesel particulate filter (DPF) carrier and the particle collecting device, and the SCR catalyst is arranged on the upstream of the diesel particulate filter (DPF) carrier; the particle collecting device is arranged between the SCR catalyst and a diesel particulate filter (DPF) carrier and comprises an aggregation filter (AF) and a cyclone particle collector (CPC); a gathering filter AF arranged at the downstream of the exhaust pipe filters particulate matters in the tail gas flowing through the exhaust pipe, and the particulate matters remained in the gathering filter AF gather into larger particles and then are discharged from the gathering filter AF; a cyclone particle collector CPC is arranged at the downstream of the aggregation filter AF and is used for capturing and treating particles discharged from the aggregation filter AF. The control method is used for controlling the front SCR tail gas treatment system.

Description

Technical Field

[0001] The invention relates to an exhaust gas treatment system and a control method thereof, in particular to an exhaust gas treatment system based on a particle collection device and a control method thereof. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] Unburned hydrocarbons, carbon monoxide, nitrogen oxides (NOx) and soot particles produced by diesel engines are the most harmful substances that have the greatest impact on the environment. Among them, the most effective way to deal with unburned hydrocarbons and carbon monoxide is to use a diesel oxidation catalyst (DOC), in which unburned hydrocarbons and carbon monoxide react with oxygen to produce carbon dioxide and water.

[0004] Selective catalytic reduction (SCR) technology is currently one of the most effective methods for controlling nitrogen oxide emissions from diesel engines. This technology achieves chemical conversion of NOx by injecting a reducing agent called automotive urea (32.5% urea solution) into the engine's exhaust system, thereby significantly reducing pollution to the environment. The core of the SCR system is the catalytic conversion process. Urea solution decomposes into ammonia (NH3) and carbon dioxide under the action of high-temperature exhaust gas. Ammonia is an effective reducing agent that reacts with nitrogen oxides under the action of SCR catalysts to produce nitrogen and water vapor, both of which are harmless. The catalyst in the SCR system is usually mixed in a slurry and coated on the surface of the carrier. These slurries are specially treated to increase the surface area and thus improve the reaction efficiency. In some systems, the catalyst may also contain small amounts of rare earth elements or other metals such as vanadium and tungsten. These additives help improve temperature resistance and anti-poisoning performance. The efficiency of the SCR system depends on precisely controlling the amount and timing of urea solution injection. This requires a complex network of sensors, including NOx sensors, temperature sensors, and flow sensors, which continuously monitor the operating status of the engine and the chemical composition of the exhaust. The control system calculates the required urea injection amount based on these data to ensure the optimal NOx emission reduction effect.

[0005] Diesel particulate filter (DPF) technology is a key environmental technology used to reduce diesel engine emissions. The DPF substrate is usually made of ceramic material, and its structure allows exhaust gas to pass through while intercepting particulate matter. After the filter has been working for a period of time, particulate matter will accumulate in the filter and need to be cleaned or regenerated. The regeneration process of the DPF substrate is usually achieved in two ways: active regeneration and passive regeneration. In active regeneration, the system actively increases the exhaust temperature through additional fuel injection or electric heating elements to burn particulate matter accumulated in the filter. Passive regeneration relies on the high temperature of the exhaust gas to naturally burn particulate matter during normal engine operation. The maintenance and management of the DPF system requires a sophisticated control strategy to ensure the efficiency of the engine and the long-term effectiveness of the filtration system.

[0006] In the after-treatment system of a diesel engine, the usual layout is that the DOC module (including a DOC package and a DOC carrier, a DOC is coated on the carrier, and the DOC module is hereinafter referred to as DOC) is at the upstream, followed by the DPF module (including a particle trap carrier and package, and the DPF module is hereinafter referred to as DPF), and the SCR module (including an SCR package and an SCR carrier, and an SCR catalyst is coated on the carrier, and the SCR module is hereinafter referred to as SCR) is at the downstream. The advantage of this layout is that it makes the most of the use of the nitrogen oxides produced by the engine to oxidize the soot, thereby reducing DPF regeneration and regeneration fuel consumption, as well as the increase in fuel consumption caused by DPF back pressure. However, under this layout, when the engine is started, the DOC and DPF must be heated before the SCR temperature can be increased. Generally speaking, the volume of the DPF is much larger than that of the DOC, and the heat capacity of the DOC and DPF causes the SCR to heat up slowly, affecting the nitrogen oxide conversion efficiency. In order to quickly increase the temperature of the SCR, it is necessary to perform thermal management on the engine, that is, to increase the engine exhaust temperature, and thermal management increases the energy consumption of the system. Another way to increase the SCR heating speed is to use a multi-channel SCR (Multi-CAN): place an SCR upstream of the DPF and use it only at low temperatures, and when the DPF heats up, shut down the upstream SCR to use nitrogen oxides to oxidize soot (improve the passive regeneration effect) and return to the nitrogen oxide conversion function of a single downstream SCR. However, this method requires an additional SCR and urea injection control, which increases the complexity of the system.

[0007] The urea injected in the SCR needs to undergo hydrolysis and pyrolysis to become ammonia. In actual applications, when the amount of urea injected is too large and the exhaust gas cannot provide enough energy for hydrolysis and pyrolysis, the urea will exist in the form of droplets or particles. This part of urea will form urea crystals and will also be discharged from the exhaust treatment system in the form of particulate matter. In order to meet more stringent emission requirements, the system often needs to add another DPF at the end of the post-treatment system, which further increases the complexity and cost of the system.

[0008] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0009] Purpose of the invention: The technical problem to be solved by the present invention is to provide an exhaust gas treatment system based on a particle collection device and a control method thereof in view of the deficiencies in the prior art.

[0010] In order to solve the above technical problems, the present invention discloses an exhaust gas treatment system based on a particle collection device and a control method thereof, wherein the exhaust gas treatment system includes an SCR catalyst, a diesel particulate trap DPF carrier and a particle collection device, wherein:

[0011] The SCR catalyst is arranged upstream of the diesel particulate trap DPF carrier;

[0012] The particle collection device is arranged between the SCR catalyst and the diesel particulate trap DPF carrier, and includes: an agglomeration filter AF and a cyclonic particle collector CPC, wherein:

[0013] The agglomeration filter AF disposed downstream of the exhaust pipe filters particulate matter in the exhaust gas flowing through the exhaust pipe, and the particulate matter retained in the agglomeration filter AF is aggregated into larger particles and then discharged therefrom;

[0014] A cyclonic particle collector CPC is provided downstream of the agglomeration filter AF for capturing and processing particulate matter discharged from the agglomeration filter AF.

[0015] Furthermore, the particle collection device further includes:

[0016] A controller electrically connected to the cyclonic particle collector CPC.

[0017] Furthermore, the aggregation filter AF specifically includes:

[0018] An inner core is arranged in parallel in the hollow cylindrical shell; the inner core is composed of a metal fiber board and a corrugated metal foil;

[0019] Wherein, the metal fiber plate and the corrugated metal foil are arranged in parallel with each other.

[0020] Furthermore, the metal fiber plate has gaps for filtering the particulate matter.

[0021] Furthermore, the corrugated metal foil is a corrugated structure, which divides the passing airflow into two airflow parts, the first airflow part flows parallel to the metal fiber plate, and the second airflow part passes through the metal fiber plate upward along the corrugated structure.

[0022] Furthermore, the cyclone particle collector CPC comprises:

[0023] A hollow inverted cone-shaped cyclone cylinder, wherein the upper side of the cyclone cylinder is provided with a connecting pipeline connected to the upstream fluid; and the bottom of the cyclone cylinder is provided with a particle collection bucket for collecting particulate matter;

[0024] An air outlet pipe is arranged on the top of the cyclone cylinder, the lower end of the air outlet pipe is vertically inserted into the cyclone cylinder, and the upper end is fluidically connected to the downstream exhaust gas treatment device.

[0025] Furthermore, a heating sensor unit is provided at the bottom of the particle collection barrel, and the heating sensor unit includes:

[0026] A particle quantity sensor and a heating device are used to detect the content of particulate matter in the particle collection barrel, and the particle quantity sensor and the heating device are electrically connected to the controller respectively.

[0027] Furthermore, the exhaust gas treatment system further includes:

[0028] A diesel oxidation catalyst DOC is connected to the upstream exhaust gas fluid, and a urea nozzle and a mixer are provided between the diesel oxidation catalyst DOC and the SCR catalyst.

[0029] Furthermore, the exhaust gas treatment system further includes:

[0030] The controller is electrically connected to a first exhaust temperature sensor disposed between the SCR catalyst and the diesel particulate trap DPF carrier and a first NOx sensor downstream of the SCR catalyst;

[0031] The controller is also electrically connected to a second exhaust temperature sensor disposed downstream of the DPF carrier;

[0032] The controller is also electrically connected to the pressure difference and pressure sensors disposed at both ends of the DPF carrier;

[0033] The controller is also electrically connected to a second NOx sensor and a third exhaust temperature sensor disposed upstream of the system SCR catalyst;

[0034] The controller is also electrically connected to a fourth exhaust temperature sensor disposed between the DOC and the SCR catalyst;

[0035] The controller is also electrically connected to the urea nozzle.

[0036] The present invention also proposes a control method for an exhaust gas treatment system based on a particle collection device, which is implemented using the above system and includes the following steps:

[0037] Step 1, the particle amount sensor collects the particle content in the particle collection bucket and sends it to the controller;

[0038] Step 2, the controller determines the relationship between the particulate matter content and the first threshold, the second threshold and the third threshold. If the particulate matter content is greater than the first threshold, the process proceeds to step 3; if the particulate matter content is greater than the second threshold, the process proceeds to step 4; if the particulate matter content is greater than the third threshold, the process proceeds to step 5;

[0039] Step 3, the controller prompts the user to clean the particle collection bucket;

[0040] Step 4, the controller sends a regeneration signal to initiate a regeneration process of the diesel particulate filter DPF carrier;

[0041] Step 5: the controller starts the electric heating device to clean the particle collection barrel.

[0042] Beneficial effects:

[0043] 1. The present invention solves the problem that the amount of NOx is reduced due to the pre-positioning of SCR, which leads to a reduction in DPF passive regeneration and an increase in soot deposition and fuel consumption. The present invention can utilize the pre-positioning of SCR to fully utilize the exhaust gas energy of the engine to increase the nitrogen oxide conversion efficiency, while not increasing the accumulation of particulate matter in the DPF and the resulting increase in the frequency of DPF regeneration and fuel consumption.

[0044] 2. The present invention has the same particle removal efficiency as a single DPF, but does not significantly increase the regeneration frequency of the DPF and the fuel consumption of the engine, so there is no need to excessively utilize passive regeneration to control soot accumulation.

[0045] 3. The present invention solves the problem of DPF soot accumulation and frequent regeneration, making SCR placed before DPF a more feasible option.

[0046] 4. The present invention can effectively filter urea particles generated by SCR urea injection without the need to add an additional DPF. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the above and / or other advantages of the present invention will become more clear.

[0048] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0049] Figure 2 It is a schematic diagram of the structure of the agglomeration filter AF and the cyclone particle collector CPC.

[0050] Figure 3aIt is a schematic diagram of the overall structure of the aggregation filter AF.

[0051] Figure 3b It is a schematic diagram of the composition structure of the poly filter AF.

[0052] Figure 4 It is a schematic diagram of the effect of the agglomeration filter AF and the cyclone particle collector CPC on particulate matter.

[0053] Figure 5a It is a schematic diagram of the overall structure of the heating sensor unit.

[0054] Figure 5b It is a schematic diagram of the heating unit structure.

[0055] Figure 5c It is a schematic diagram of the upper base structure.

[0056] Figure 6 This is a schematic diagram of the brake kinetic energy recovery device. DETAILED DESCRIPTION

[0057] In order to fully utilize the exhaust energy of the engine without increasing the accumulation of particulate matter in the DPF and the resulting increase in DPF regeneration frequency and fuel consumption, the present invention proposes a post-treatment system, which is composed of a DOC, an SCR, and a DPF system (ACDPF) with an aggregation filter (AF, Aggregation Filter) and a cyclone particle collector (CPC, Cyclone Particulate Collector). In the ACDPF system, the AF first filters small soot and ash particles and aggregates them into large-sized particles in the filter. Then, due to the increase in pressure resistance, these large particles will be blown out, causing particle leakage (Blow-Off). The particles leaked from the AF are captured by the CPC and eventually cleaned through maintenance or removed by heating and oxidation. At the same time, the tiny particles leaked from the AF and CPC are eventually captured by the DPF. The ACDPF has the same particle removal efficiency as a single DPF, but does not significantly increase the regeneration frequency of the DPF and the engine fuel consumption, so there is no need to excessively use passive regeneration to control soot accumulation. ACDPF is arranged downstream of SCR, and can fully utilize the energy of engine exhaust to heat SCR when the engine is cold started, without heating DPF first. ACDPF solves the problem of DPF soot accumulation and frequent regeneration, making SCR before DPF a more feasible option. In addition, since DPF is arranged at the most downstream of the post-treatment system, it can also effectively filter the urea particles generated by SCR urea injection without the need to add an additional DPF.

[0058] System structure Figure 1As shown, the system includes a DOC 145, an SCR 120, and a DPF 110. A diesel oxidation catalyst (DOC) is encapsulated in the DOC 145, a selective catalytic reduction catalyst (SCR catalyst) is encapsulated in the SCR 120, and a diesel particulate filter (DPF) is encapsulated in the DPF 110. A NOx sensor 148 and an exhaust temperature sensor 149 are arranged upstream of the DOC 145. The NOx sensor 148 is used to measure the original nitrogen and oxygen content of the engine, and the exhaust temperature sensor 149 is used to measure the exhaust temperature upstream of the DOC. An exhaust temperature sensor 151, a urea nozzle 146, and a mixer 113 are installed between the DOC 145 and the SCR 120. The urea sprayed by the urea nozzle 146 becomes smaller in particles after passing through the mixer 113 and is fully mixed with the exhaust gas. The mixed exhaust gas enters the SCR 120. The outlet of the SCR 120 is connected to the inlet of the agglomeration filter AF 103 through the exhaust pipe 101. An exhaust temperature sensor 147 and a downstream NOx sensor 178 are installed on the exhaust pipe 101. The denitration reaction in the SCR 120 is achieved by controlling the urea injection amount, and the control of the urea injection amount can be achieved by the controller 140 controlling the opening and closing time of the urea nozzle 146 within a certain period according to the exhaust gas temperature signal obtained by the exhaust temperature sensors 151 and 147, and the nitrogen oxide concentration signal obtained by the upstream NOx sensor 148 and the downstream NOx sensor 178.

[0059] The outlet end of AF 103 is connected to the inlet end of CPC 100 through connecting pipe 102, and the outlet end of CPC 100 is connected to the inlet end cone of DPF 110 through connecting pipe 111. A heating sensor unit is installed at the bottom of CPC 100, which is used to detect the amount of particulate matter falling into the particle collection bucket and oxidize and remove the soot particles therein by electric heating. An exhaust temperature sensor 117 is installed on the outlet end cone of DPF 110 to measure the exhaust gas temperature at the outlet end of DPF, and there are air pipes at both ends of DPF connected to the pressure difference and pressure sensor 125, which is used to detect the amount of soot deposition in DPF.

[0060] exist Figure 1 In the system shown, exhaust temperature sensors 149, 151, 147, and 117 are electrically connected to the controller 140 via signal lines 181, 182, 186, and 177, respectively, while NOx sensors 148 and 178 communicate with the controller via signal lines 181 and 188. The heating sensing unit in CPC 100 includes a carbon loading sensor and a heater, which are connected to the controller 140 via signal lines 189 and 176, respectively, while the air pipe is connected to the pressure difference and pressure sensor 125 is electrically connected to the controller 140 via signal line 187. The controller 140 controls the urea nozzle 146 via signal line 183.

[0061] exist Figure 1 In the system shown in FIG. 1 , an embodiment of CPC 100 is structured as follows: Figure 2 As shown. In the figure, CPC 100 includes an inverted conical cyclone barrel 105, a particle collection barrel 115 and a heating sensor unit 116. The particle collection barrel 115 is located at the lower end of the inverted conical cyclone barrel 105, and the heating sensor unit is located at the bottom of the particle collection barrel 115. The heating sensor unit 116 includes a particle amount sensor and a heating device. The particle amount sensor is electrically connected to the controller 140 through a signal line 189, and the heating device is electrically connected to the controller 140 through a signal line 182. The function of the particle amount sensor is to detect the amount of particulate matter in the CPC, and the function of the heating device is to remove the combustible particulate matter (such as carbon smoke) therein by heating the particulate matter. An outlet pipe 104 is arranged at the upper end of the cyclone barrel 105, and the exhaust gas that has filtered out some particulate matter flows out through the outlet pipe.

[0062] exist Figure 1 In the system shown, AF 103 can be used as follows Figure 3a The structure shown. Figure 3b As shown in FIG. 1 , the inner core 200 of the AF 103 is composed of a calcined porous metal fiber sheet 201 and a corrugated metal foil 202. In the AF 103, the airflow flows in the direction of the arrow, and when the airflow flows through the metal fiber sheet 201, the soot and ash therein are filtered out by the metal fibers. The soot and ash trapped in the metal fibers will gather into larger particles, and when the airflow resistance caused by them is too large, they will be blown away by the airflow (Blow-off, particle leakage), and these blown away large particles will be collected in the CPC 100 when passing through it.

[0063] A typical curve of the effect of AF and CPC on particulate matter is as follows: Figure 4 As shown in the figure, curve 191 is the mass distribution of particles upstream of AF and CPC, 192 is the mass distribution of particles downstream, and curves 193 and 190 are the variation curves of particle removal efficiency of AF and CPC with particle size. It can be seen from curve 191 that the particle removal efficiency of CPC is related to the particle size. The larger the particle size, the higher the removal efficiency. Curve 193 shows that AF has a relatively high removal efficiency for both small and large particles, but a relatively low removal efficiency for particles around 50 nanometers.

[0064] exist Figure 1 In the system shown, AF 103 only leaks particles when the airflow rate is high and the back pressure is high. In addition, the diameter of the particles released during the particle leakage is above 1 micron. At this time, the corresponding CPC 100's filtration efficiency can exceed 90% ( Figure 4), so AF 103 cooperates with CPC 100 to aggregate small particles into large particles, and can obtain a comprehensive particle removal efficiency of more than 80%. In addition, AF 103 can also be coated with an oxidation catalyst, such as an oxidation catalyst containing precious metals platinum and palladium. Under the action of the oxidation catalyst, liquid soluble particles (SOF) in carbon soot can be oxidized and converted into water and carbon dioxide, thereby reducing the amount of carbon soot deposition.

[0065] AF 103 cannot filter out all particulate matter. The tiny particles that are not filtered out are collected by the downstream DPF 110 after passing through AF 103 and CPC 100 with the exhaust gas flow. Since DPF 110 only collects some tiny particles in the exhaust gas, its volume can be greatly reduced, reducing back pressure and energy consumed by regeneration. Since DPF only collects small particles and mainly regenerates passively, the DPF regeneration time can be extended a lot, thereby saving fuel consumption. At the same time, using remote post-injection for DPF regeneration will cause oil dilution. Increasing the regeneration time interval will solve this problem because it will allow the fuel in the diluted oil enough time to evaporate.

[0066] In addition to the removal of part of the SOF in the DOC 120 and the AF 103, a large portion of the soot and ash particles will fall into the particle collection bucket 115. There are three ways to remove this part of the particles:

[0067] Removal method 1: During system maintenance, the particle collection barrel 115 is removed and the particles therein are processed;

[0068] Removal method 2: When the DPF is regenerated, high-temperature combustion gas is used to oxidize the soot in the particle collection barrel to produce water and carbon dioxide;

[0069] Removal method three: using the heating sensor unit 116 to electrically heat the particulate matter in the particle collection barrel 115 to oxidize the soot particles therein.

[0070] Among the above three removal methods, the first removal method is necessary because it is necessary to remove ash particles that cannot be eliminated by high-temperature oxidation. Removal method 2 can be performed simultaneously during DPF regeneration, so if a special CPC regeneration mode is not added, no special treatment is required. If the system only uses removal method 1 and removal method 2, the particle collection barrel 115 can adopt a simple structure without the need for heating the sensor unit 116. In this case, it is only necessary to regularly clean the particles in the particle collection barrel.

[0071] The heating sensor unit 116 includes two parts, a heater and a sensor unit. The heater is used to heat up by electric heating to oxidize and remove the soot in the particle collection barrel, while the sensor unit is used to detect the amount of soot and ash deposited in the particle collection barrel 115. The heating sensor unit 116 supports the soot removal method 2 and the soot removal method 3. An embodiment of the heating sensor unit is as follows: Figure 5a In this embodiment, the heating sensor unit includes a housing 410, a lower base 430, an upper base 431, bolts 411, a heating unit 420, a heat-conducting column 418, a particle amount detection electrode 1 415 and a particle amount detection electrode 2 416. Figure 4 As shown, in the heating sensor unit, the lower base 430 and the upper base 431 are fastened to the housing 410 by bolts 411; the upper surface of the lower base 430 and the lower surface of the upper base 431 are provided with corresponding grooves that can enclose a closed space, and the heating unit 420 is arranged in the closed space between the lower base 430 and the upper base 431. Figure 5b As shown, the heating unit 420 is composed of a heat conductor 441 and an electric heating body 442. The electric heating body 442 has an electrode 1 426 and an electrode 2 427. The electrode 1 426 and the electrode 2 427 are provided with an outer insulator 425 and an insulator 2 428 to insulate them from the upper and lower bases 431 and 430. At the same time, the electrode 1 426 and the electrode 2 427 are electrically connected to the controller 140 through the signal line 182. Figure 5c As shown, there is a heat-conducting column 418 on the upper base 431, and a catalyst coating can be applied on the outer surface of the upper base 431 and the heat-conducting column 418 to assist in oxidizing carbon smoke. In the middle of the upper base 431 and the lower base 430, a particle amount detection electrode 1 415 and a particle amount detection electrode 2 416 are inserted, and the bottom of the particle amount detection electrode 1 415 is provided with an outer insulator 3 421 to insulate it from the upper and lower bases 431 and 430, while the electrode part is in contact with the particles; the bottom of the particle amount detection electrode 2 416 is provided with an outer insulator 423, and the particle amount detection electrode 1 415 and the particle amount detection electrode 2 416 are connected to the controller 140 through the signal line 182.

[0072] exist Figure 4 In the structure shown, the particulate matter accumulated between the particle amount detection electrode 1 415 and the particle amount detection electrode 2 416 will cause the impedance between the two electrodes to change. By detecting the impedance change, the amount of particulate matter accumulation can be detected. When the controller 140 detects that the amount of particulate matter exceeds a limit value, a DPF regeneration signal can be generated, and the signal triggers the DPF regeneration process through the ECU (not shown). When the amount of particulate matter further exceeds a limit value, the controller 140 can trigger a maintenance signal to prompt and require the user to maintain the CPC 100.

[0073] During maintenance of CPC 100, the engine is first shut down, and then after cooling, the particle collection barrel 213 is removed from the cyclone barrel 212 and the collected material is cleaned. After cleaning, a cleaning fluid containing a weak acid solution may be used for further cleaning to remove the ash therein.

[0074] The particulate matter signal can also be further used to control the electric heating unit 420 to heat the heating sensor unit 116, thereby oxidizing and removing the soot therein. A simple heating logic can be set as follows: when the controller 140 detects that the amount of particulate matter exceeds a limit, the electric heating is turned on through the signal line 182. Since the electric heating only heats the soot instead of the exhaust gas, the fuel consumption of regeneration can be greatly saved. During heating, the catalyst coating on the outer surface of the upper base 431 and the heat-conducting column 418 can reduce the oxidation reaction temperature of the soot, so that the oxidation reaction is carried out at a lower temperature, thereby saving heating energy.

[0075] The electric heating energy of the heating sensor unit shown in FIG5 can also be provided by the braking recovery energy. Figure 6 As shown, in one example, the brake kinetic energy recovery device includes a transmission control device 152 and a motor generator 155 (Motor Generator) installed on an axle 153. The axle 153 is connected to the wheel 154, and the motor generator 155 is electrically connected to the controller 140 through a signal line 151. When the vehicle brakes, the motor generator 155 enters a generator state and is driven by the axle 153. The electricity generated by the motor generator 155 is applied to the heating sensor unit via the signal line 151, the controller 140, and the signal line 176 for heating the heating sensor unit. Brake heating is a recovery of energy and does not increase fuel consumption.

[0076] In a specific implementation, the present application provides a computer storage medium and a corresponding data processing unit, wherein the computer storage medium can store a computer program, and when the computer program is executed by the data processing unit, the invention content of an exhaust gas treatment system based on a particle collection device and a control method thereof provided by the present invention and some or all steps in each embodiment can be run. The storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

[0077] Those skilled in the art can clearly understand that the technical solutions in the embodiments of the present invention can be implemented by means of computer programs and their corresponding general hardware platforms. Based on such an understanding, the technical solutions in the embodiments of the present invention can be essentially or partly contributed to the prior art in the form of computer programs, i.e., software products, which can be stored in a storage medium and include several instructions for enabling a device including a data processing unit (which can be a personal computer, a server, a single-chip microcomputer, an MCU or a network device, etc.) to execute the methods described in various embodiments of the present invention or certain parts of the embodiments.

[0078] The present invention provides an exhaust gas treatment system based on a particle collection device and a control method thereof. There are many methods and ways to implement the technical solution. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention. All components not specified in this embodiment can be implemented by existing technologies.

Claims

1. An exhaust gas treatment system based on a particle collection device, characterized in that: The exhaust gas treatment system includes an SCR catalyst, a diesel particulate filter DPF carrier and a particle collection device, wherein: The SCR catalyst is arranged upstream of the diesel particulate trap DPF carrier; The particle collecting device is arranged between the SCR catalyst and the diesel particulate trap DPF carrier, and comprises: an agglomeration filter AF (103) and a cyclonic particle collector CPC (100), wherein: An agglomeration filter AF (103) disposed downstream of the exhaust pipe (101) filters particulate matter in the exhaust gas flowing through the exhaust pipe (101), and the particulate matter retained in the agglomeration filter AF (103) is aggregated into larger particles and then discharged therefrom; A cyclonic particle collector CPC (100) is provided downstream of the agglomeration filter AF (103) for capturing and processing particulate matter discharged from the agglomeration filter AF (103).

2. The exhaust gas treatment system based on the particle collection device according to claim 1, characterized in that: The particle collection device further comprises: A controller (140) is electrically connected to the cyclonic particle collector CPC (100).

3. The exhaust gas treatment system based on the particle collection device according to claim 2, characterized in that: The aggregation filter AF (103) specifically comprises: An inner core (200) is arranged in parallel in the hollow cylindrical shell; the inner core (200) is composed of a metal fiber board (201) and a corrugated metal foil (202); Wherein, the metal fiber plate (201) and the corrugated metal foil (202) are arranged in parallel with each other.

4. The exhaust gas treatment system based on the particle collection device according to claim 3 is characterized in that: The metal fiber plate (201) has gaps for filtering the particulate matter.

5. The exhaust gas treatment system based on the particle collection device according to claim 4, characterized in that: The corrugated metal foil (202) is a corrugated structure, which divides the passing airflow into two airflow parts, the first airflow part flows parallel to the metal fiber plate (201), and the second airflow part flows upward along the corrugated structure through the metal fiber plate (201).

6. The exhaust gas treatment system based on the particle collection device according to claim 5, characterized in that: The cyclone particle collector CPC (100) comprises: A hollow inverted cone-shaped cyclone cylinder (105), wherein the upper side of the cyclone cylinder (105) is provided with a connecting pipeline (102) connected to an upstream fluid; and the bottom of the cyclone cylinder (105) is provided with a particle collection bucket (115) for collecting particulate matter; An air outlet pipe (104) is provided at the top of the cyclone cylinder (105). The lower end of the air outlet pipe (104) is vertically inserted into the cyclone cylinder (105), and the upper end is fluidically connected to a downstream exhaust gas treatment device.

7. The exhaust gas treatment system based on the particle collection device according to claim 6, characterized in that: A heating sensor unit (116) is provided at the bottom of the particle collection barrel (115), and the heating sensor unit (116) comprises: A particle quantity sensor and a heating device are used to detect the particle content in the particle collection barrel (115), and the particle quantity sensor and the heating device are electrically connected to the controller (140) respectively.

8. The exhaust gas treatment system based on the particle collection device according to claim 7, characterized in that: The tail gas treatment system further comprises: A diesel oxidation catalyst (DOC) is connected to the upstream exhaust gas fluid, and a urea nozzle (146) and a mixer (113) are provided between the diesel oxidation catalyst (DOC) and the SCR catalyst.

9. The exhaust gas treatment system based on the particle collection device according to claim 8, characterized in that: The tail gas treatment system further includes: The controller (140) is electrically connected to a first exhaust temperature sensor (147) disposed between the SCR catalyst and the diesel particulate trap (DPF) carrier and a first NOx sensor (178) downstream of the SCR catalyst; The controller (140) is also electrically connected to a second exhaust temperature sensor (117) disposed downstream of the DPF carrier; The controller (140) is also electrically connected to a pressure difference and pressure sensor (125) disposed at both ends of the DPF carrier; The controller (140) is also electrically connected to a second NOx sensor (148) and a third exhaust temperature sensor (149) disposed upstream of the system SCR catalyst; The controller (140) is also electrically connected to a fourth exhaust temperature sensor (151) disposed between the DOC and the SCR catalyst; The controller (140) is also electrically connected to the urea nozzle (146).

10. A control method for an exhaust gas treatment system based on a particle collection device, implemented by the system of claim 9, characterized in that: The following steps are involved: Step 1, the particle amount sensor collects the particle content in the particle collection bucket (115) and sends it to the controller (140); Step 2, the controller (140) determines the relationship between the particulate matter content and the first threshold, the second threshold and the third threshold, and if the particulate matter content is greater than the first threshold, proceeds to step 3, if the particulate matter content is greater than the second threshold, proceeds to step 4, and if the particulate matter content is greater than the third threshold, proceeds to step 5; Step 3, the controller (140) prompts the user to clean the particle collection bucket (115); Step 4, the controller (140) sends a regeneration signal to initiate a regeneration process of the diesel particulate filter DPF carrier; Step 5: the controller (140) starts the electric heating device to clean the particle collection barrel (115).

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