SDPF system based on particle collecting device and control method thereof

Abstract

The invention provides an SDPF system based on a particle collecting device and a control method thereof.The SDPF system comprises the particle collecting device, the particle collecting device comprises an aggregation filter AF (103) and a cyclone particle collector CPC (100), the aggregation filter AF (103) receives tail gas discharged from the upstream and filters particulate matter in the tail gas, and the cyclone particle collector CPC (100) is connected with the aggregation filter AF (103) and the cyclone particle collector CPC (100). After the particulate matters retained in the aggregation filter AF (103) are aggregated into larger particulate matters, the larger particulate matters are discharged from the aggregation filter AF (103); a cyclone particulate matter collector (CPC) (100) is arranged at the downstream of the aggregation filter AF (103) and is used for capturing and treating the particulate matters discharged from the aggregation filter AF (103); the control method is realized by adopting the system.

Description

Technical Field

[0001] The present invention relates to a SDPF system and a control method thereof, in particular to a SDPF 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 carrier 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 DPF 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 some applications, especially in light-duty applications, there is also SDPF (SCR-Catalyzed Diesel Particulate Filters) technology. This technology combines SCR and DPF. In the SDPF system, the SCR catalyst is coated on the DPF carrier, so that the reduction of NOx and PM can be completed in the same device. This configuration not only saves space, but also improves the efficiency and effectiveness of the entire system through synergistic effects. Since the SCR catalyst is coated on the DPF carrier, the SDPF can make full use of the exhaust gas energy, heating the SCR while heating the DPF carrier, thereby quickly achieving efficient NOx conversion at lower exhaust temperatures. SDPF is usually installed close to the diesel engine exhaust valve, which helps to further increase the temperature of the NOx reduction reaction, thereby improving the NOx conversion rate at low exhaust temperatures. At the same time, by optimizing the catalyst coating strategy, SDPF can reduce exhaust back pressure and flow resistance under high engine load conditions.

[0007] However, compared with the conventional layout, in this layout, the DOC is at the upstream, followed by the DPF, and the SCR is at the downstream. Since the SDPF cannot be coated with precious metal oxidation catalysts, and its SCR function consumes most of the nitrogen oxides, its passive regeneration function is very weak. At the same time, soot coverage has a significant impact on its SCR efficiency. In order to increase the SCR efficiency, it is necessary to increase the amount of precious metal coating on the upstream DOC, and reduce its accumulation in the SDPF by increasing the DOC's oxidation and elimination efficiency of liquid particulate matter (SOF) and unburned hydrocarbons. At the same time, increasing the amount of DOC precious metal coating will also increase the content of nitrogen dioxide in the exhaust gas, thereby improving the SCR nitrogen oxygen conversion efficiency and improving the passive regeneration function. However, increasing the amount of precious metal coating on the DOC increases the cost of the system.

[0008] In addition, compared with separate SCR and DPF, SDPF requires a high-porosity DPF carrier, which significantly increases the difficulty of manufacturing. Moreover, the regeneration of SDPF needs to consider the impact on both DPF and SCR catalysts, and the control is more complicated. Frequent regeneration will also affect the service life of SDPF, which further increases the cost of the system.

[0009] 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

[0010] Purpose of the invention: The technical problem to be solved by the present invention is to provide a SDPF system based on a particle collection device and a control method thereof in view of the deficiencies in the prior art.

[0011] In order to solve the above technical problems, the present invention discloses a SDPF system based on a particle collection device and a control method thereof. The SDPF system includes a particle collection device, wherein:

[0012] The particle collection device comprises: an agglomeration filter AF and a cyclone particle collector CPC, wherein:

[0013] The agglomeration filter AF receives exhaust gas discharged from upstream and filters particulate matter in the exhaust gas, 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, in the SDPF system, a DPF carrier is arranged downstream of the particle collecting device, an SCR catalyst is coated on the DPF carrier, and a urea injection nozzle is installed upstream of the particle collecting device.

[0016] Furthermore, the particle collection device further includes:

[0017] A controller electrically connected to the cyclonic particle collector CPC.

[0018] Furthermore, the aggregation filter AF specifically includes:

[0019] 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;

[0020] Wherein, the metal fiber sheet and the corrugated metal foil are arranged in parallel with each other;

[0021] The metal fiber plate has gaps therein for filtering the particulate matter.

[0022] 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.

[0023] Furthermore, the cyclone particle collector CPC comprises:

[0024] 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;

[0025] The top of the cyclone cylinder is provided with an air outlet pipe, the lower end of which is vertically inserted into the cyclone cylinder, and the upper end of which is fluidically connected to a downstream exhaust gas treatment device;

[0026] A heating sensor unit is provided at the bottom of the particle collection barrel, and the heating sensor unit includes:

[0027] 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.

[0028] Furthermore, the SDPF system further includes:

[0029] A DOC module connected to the exhaust gas outlet fluid of the upstream system, the downstream of the DOC module is connected to the agglomeration filter AF fluid, and a third exhaust temperature sensor is provided downstream of the DOC module;

[0030] The downstream of the aggregation filter AF is fluidically connected to a decomposition tube, and the decomposition tube is provided with an interface for connecting a urea nozzle;

[0031] The downstream of the decomposition pipe is fluidically connected to the connecting pipeline of the cyclone particle collector CPC, and the downstream of the cyclone particle collector CPC is fluidically connected to the particle trap SDPF;

[0032] The particulate trap SDPF includes the DPF carrier coated with the SCR catalyst.

[0033] Furthermore, the SDPF system further includes:

[0034] The agglomeration filter AF is fluidly connected to the exhaust outlet of the upstream system, and the DOC is coated in the agglomeration filter AF;

[0035] A third exhaust temperature sensor is provided downstream of the agglomeration filter AF;

[0036] The downstream of the aggregation filter AF is fluidically connected to a decomposition tube, and the decomposition tube is provided with an interface connected to the urea nozzle;

[0037] The downstream of the decomposition pipe is fluidically connected to the connecting pipeline of the cyclone particle collector CPC, and the downstream of the cyclone particle collector CPC is fluidically connected to the particle trap SDPF;

[0038] The DPF carrier in the particle trap SDPF is coated with an SCR catalyst.

[0039] Furthermore, the SDPF system further includes:

[0040] The controller is electrically connected to a first exhaust temperature sensor and a first NOx sensor disposed at an exhaust gas outlet of an upstream system;

[0041] The controller is also electrically connected to a second exhaust temperature sensor and a second NOx sensor disposed downstream of the particulate trap SDPF;

[0042] The controller is also electrically connected to the pressure difference and pressure sensors disposed at both ends of the particle trap SDPF;

[0043] The controller is also electrically connected to the urea nozzle and the third exhaust temperature sensor.

[0044] The present invention also proposes a control method for a SDPF system based on a particle collection device, which is implemented using the aforementioned system and includes the following steps:

[0045] Step 1, the particle amount sensor collects the particle content in the particle collection bucket and sends it to the controller;

[0046] 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;

[0047] Step 3, the controller prompts the user to clean the particle collection bucket;

[0048] Step 4, the controller sends a regeneration signal to initiate a regeneration process of the diesel particulate filter SDPF;

[0049] Step 5: the controller starts the electric heating device to clean the particle collection barrel.

[0050] Beneficial effects:

[0051] 1. The system proposed by the present invention reduces the accumulation of soot in the SDPF, thereby reducing the initial installation cost and use cost of the system and extending the life of the SDPF.

[0052] 2. The system proposed by the present invention has the particle removal efficiency of the conventional SDPF system, but has less soot deposition, lower regeneration frequency and engine fuel consumption, so the amount of precious metal coating of the DOC and the size of the SDPF can be reduced.

[0053] 3. In the present invention, CPC also plays the role of a mixer: the uniformity of ammonia distribution is improved through swirl, and large urea particles are filtered out at the same time. The system does not need a separate mixer, which makes the system more compact and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] 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.

[0055] Figure 1 It is a schematic diagram of the overall structure of an embodiment with a DOC module.

[0056] Figure 2 It is a schematic diagram of the overall structure of an embodiment in which the DOC module is omitted.

[0057] Figure 3 It is a schematic diagram of the structure of the agglomeration filter AF and the cyclone particle collector CPC.

[0058] Figure 4a It is a schematic diagram of the overall structure of the aggregation filter AF.

[0059] Figure 4b It is a schematic diagram of the composition structure of the poly filter AF.

[0060] Figure 5 It is a schematic diagram of the effect of the agglomeration filter AF and the cyclone particle collector CPC on particulate matter.

[0061] Figure 6a It is a schematic diagram of the overall structure of the heating sensor unit.

[0062] Figure 6b It is a schematic diagram of the heating unit structure.

[0063] Figure 6c It is a schematic diagram of the upper base structure.

[0064] Figure 7 This is a schematic diagram of the brake kinetic energy recovery device. DETAILED DESCRIPTION

[0065] In order to reduce the accumulation of soot in the SDPF, thereby reducing the initial installation cost and the use cost of the system, and extending the life of the SDPF, the present invention proposes a post-treatment system, which is composed of a DOC, a multifunctional particle collector with an aggregation filter (AF, Aggregation Filter), a decomposition tube and a cyclone particle collector (CPC, Cyclone Particulate Collector), and an SDPF system. In this system, the AF first filters small soot and ash particles, and aggregates them into large-sized particles in the filter, and 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 and the large urea particles generated during urea injection are captured by the CPC, the soot particles are cleaned and removed by heating and oxidation through maintenance, and the urea particles can be pyrolyzed and hydrolyzed into ammonia by heating. The tiny particles that escape from the AF and CPC are eventually captured by the SDPF. The entire system has the particle removal efficiency of the conventional SDPF system, but with less soot deposition, lower regeneration frequency and engine fuel consumption, so the amount of precious metal coating on the DOC and the size of the SDPF can be reduced. At the same time, the CPC also acts as a mixer: it improves the uniformity of ammonia distribution through swirl flow, and filters out large particles of urea. The system does not require a separate mixer, which makes the system more compact and reduces costs.

[0066] System structure Figure 1As shown, the system includes a DOC module 145 and an SDPF module 110. A NOx sensor 148 and an exhaust temperature sensor 151 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 151 is used to measure the exhaust temperature upstream of the DOC. An agglomeration filter AF 103, a decomposition pipe 113, and a CPC 100 are installed downstream of the DOC 145. After passing through the DOC 145, the soot generated by the engine enters the agglomeration filter AF 103, where small particles are aggregated into large particles and then released in the particle release process. A urea nozzle 146 is installed on the decomposition pipe 113, and the urea sprayed by the urea nozzle 146 enters the decomposition pipe 113 and mixes with the exhaust gas. The intake end of the CPC 100 is connected to the decomposition pipe 113 through the intake pipe 102, receiving the exhaust gas with urea flowing out therefrom, and the large particle soot released from the AF 103. 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 to oxidize and remove the soot particles therein by means of electric heating, as well as to pyrolyze and hydrolyze the urea particles. The outlet end of CPC 100 is connected to the intake end cone of SDPF 110 through the outlet pipe 111, and the air pipes at both ends of SDPF 110 are connected to the pressure difference and pressure sensor 125, which is used to detect the amount of soot deposition in SDPF. The tail end of SDPF 110 is connected to the exhaust temperature sensor 117 for measuring the exhaust temperature at the outlet end of DPF, and there is also a downstream NOx sensor for detecting the nitrogen oxide concentration downstream of SDPF.

[0067] exist Figure 1In the system shown, the exhaust temperature sensors 151, 149, and 117 are connected to the controller 140 via signal lines 182, 183, and 177, respectively, while the nitrogen oxide sensors 148 and 144 communicate with the controller via signal lines 181 and 178. The heating sensing unit in the CPC 100 includes a carbon load 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 the pressure sensor 125 is connected to the controller 140 via signal line 187. The controller 140 controls the urea nozzle 146 via signal line 186. In the system, 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 temperature signal obtained by the exhaust temperature sensors 149 and 117, and the nitrogen oxide concentration signal obtained by the upstream NOx sensor 148 and the downstream NOx sensor 144. The carbon load in the SDPF can be calculated based on the sensing signal obtained by the pressure difference and pressure sensor 125, the exhaust gas flow value obtained by the engine ECU (not shown), and the exhaust gas temperature value obtained by the exhaust temperature sensors 149 and 117. If the carbon load is higher than a certain threshold, a request signal can be generated to trigger SDPF regeneration or further trigger DPF maintenance. During the regeneration process of the SDPF, the control of the exhaust gas temperature can be achieved by the ECU by controlling the near-after injection and far-after injection of the engine fuel injection system based on the sensing values ​​from the temperature sensors 151, 149, and 117, the exhaust gas flow rate, and the calculated SDPF carbon load.

[0068] exist Figure 1 In the system shown in FIG. 1 , an embodiment of CPC 100 is structured as follows: Figure 3 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 (carbon smoke) therein and to pyrolyze and hydrolyze the urea particles 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 with some particulate matter filtered out flows out through the outlet pipe.

[0069] exist Figure 1 In the system shown, AF 103 can be used as follows Figure 4a The structure shown. Figure 4bAs 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.

[0070] A typical curve of the effect of AF and CPC on particulate matter is as follows: Figure 5 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.

[0071] 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 filtration efficiency of CPC 100 can exceed 90% ( Figure 5 ), 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.

[0072] In some applications, when the engine emissions are low, the DOC function can be combined with the AF function, and the DOC carrier can be eliminated by coating the DOC in the AF. Figure 2As shown, in this system, AF 103 has two functions: DOC and AF, and exhaust temperature sensors 151 and 149 are arranged upstream and downstream of AF 103, respectively. Since there is a situation where particulate matter covers the catalyst in AF 103, SDPF regeneration needs to be performed before AF 103 has significant particulate accumulation or after AF 103 completes particulate leakage. The detection of the amount of particulate accumulation in AF 103 can use the upstream pressure sensing value Pu of SDPF 110 generated by the pressure and differential pressure sensor 115: the piezoresistance is calculated from the Pu value and the engine exhaust flow value, and the SDPF is regenerated within a period of time after the piezoresistance is lower than a certain threshold or the piezoresistance change rate is greater than a certain threshold.

[0073] AF 103 cannot filter out all particulate matter. The tiny particles that are not filtered out are collected by the downstream SDPF 110 after passing through AF 103 and CPC 100 with the exhaust gas flow. Since SDPF 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 SDPF only collects small particles and mainly regenerates passively, the SDPF regeneration time can be extended a lot, thereby saving fuel consumption. At the same time, the use of remote post-injection for SDPF 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.

[0074] In addition to the removal of part of the SOF in the DOC 120 and the AF 103, a large portion of the soot, ash, and urea particles will fall into the particle collection bucket 115. There are three ways to remove this part of the particles:

[0075] Removal method 1: During system maintenance, the particle collection barrel 115 is removed and the particles therein are processed;

[0076] Removal method 2: When the DPF is regenerated, high-temperature combustion gas is used to oxidize the soot in the particle collection barrel to generate water and carbon dioxide, and to pyrolyze and hydrolyze the urea particles into ammonia and carbon dioxide;

[0077] Removal method three: using the heating sensor unit 116 to electrically heat the particulate matter in the particle collection barrel 115 to oxidize and decompose the soot and urea particulate matter therein.

[0078] 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.

[0079] The heating sensor unit 116 includes two parts, a heater and a sensor unit. The heater is used to heat up by electric heating, oxidize and remove the soot in the particle collection barrel, and decompose the urea therein, while the sensor unit is used to detect the amount of particulate matter deposited in the particle collection barrel 115. The heating sensor unit 116 supports the second and third particle removal modes. An embodiment of the heating sensor unit is as follows: Figure 6a As shown. 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. 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 6b 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 6c 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.

[0080] exist Figure 6aIn 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, it can generate an SDPF regeneration signal, which triggers the SDPF regeneration process through the ECU (not shown) to oxidize the soot and decompose urea. 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 perform maintenance on the CPC 100.

[0081] 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.

[0082] 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 decomposing the soot and urea therein. A simple heating logic can be set as follows: when the controller 140 detects that the amount of particulate matter exceeds a limit value, the electric heating is turned on through the signal line 182. The heating temperature is relatively low and is only used to decompose urea. If the amount of particulate matter is still high (for example, higher than another limit value) after the urea decomposition process is completed, the heating temperature is increased to oxidize the soot. Since the electric heating only heats the soot and urea 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 reaction temperature of the particulate matter, so that the reaction is carried out at a lower temperature, thereby saving heating energy.

[0083] exist Figure 6a The electrical heating energy of the heating sensor unit shown can also be provided by brake recovery energy. Figure 7 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.

[0084] 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 a SDPF 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 executed. The storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

[0085] 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.

[0086] The present invention provides a SDPF 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. A SDPF system based on a particle collection device, characterized in that: The SDPF system includes a particle collection device, wherein: The particle collection device comprises: an agglomeration filter AF (103) and a cyclone particle collector CPC (100), wherein: The agglomeration filter AF (103) receives exhaust gas discharged from upstream and filters particulate matter in the exhaust gas, 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 SDPF system based on the particle collection device according to claim 1, characterized in that: In the SDPF system, a DPF carrier is arranged downstream of the particle collection device, an SCR catalyst is coated on the DPF carrier, and a urea injection nozzle (146) is installed upstream of the particle collection device.

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

4. The SDPF system based on the particle collection device according to claim 3, 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; The metal fiber plate (201) has gaps for filtering the particulate matter.

5. The SDPF 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 SDPF 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; The top of the cyclone cylinder (105) is provided with an air outlet pipe (104), 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; 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.

7. The SDPF system based on the particle collection device according to claim 6, characterized in that: The SDPF system further includes: A DOC module (145) connected to the exhaust gas outlet fluid of the upstream system, the downstream of the DOC module (145) is connected to the agglomeration filter AF (103) fluid, and a third exhaust temperature sensor (149) is provided downstream of the DOC module (145); The downstream of the aggregation filter AF (103) is fluidically connected to a decomposition pipe (113), and the decomposition pipe (113) is provided with an interface for connecting a urea nozzle (146); The downstream of the decomposition pipe (113) is fluidically connected to the connecting pipeline (102) of the cyclone particle collector CPC (100), and the downstream of the cyclone particle collector CPC (100) is fluidically connected to the particle trap SDPF (110); The particulate trap SDPF (110) includes the DPF carrier coated with the SCR catalyst.

8. The SDPF system based on the particle collection device according to claim 6, characterized in that: The SDPF system further includes: The agglomeration filter AF (103) is fluidically connected to the exhaust outlet of the upstream system, and DOC is coated in the agglomeration filter AF (103); A third exhaust temperature sensor (149) is provided downstream of the agglomeration filter AF (103); The downstream of the aggregation filter AF (103) is fluidically connected to a decomposition tube (113), and the decomposition tube (113) is provided with an interface connected to the urea nozzle (146); The downstream of the decomposition pipe (113) is fluidically connected to the connecting pipeline (102) of the cyclone particle collector CPC (100), and the downstream of the cyclone particle collector CPC (100) is fluidically connected to the particle trap SDPF (110); The DPF carrier in the particle trap SDPF (110) is coated with an SCR catalyst.

9. A SDPF system based on a particle collection device according to claim 7 or 8, characterized in that: The SDPF system further includes: The controller (140) is electrically connected to a first exhaust temperature sensor (151) and a first NOx sensor (148) disposed at an exhaust gas outlet of an upstream system; The controller (140) is also electrically connected to a second exhaust temperature sensor (117) and a second NOx sensor (144) disposed downstream of the particle trap SDPF (110); The controller (140) is also electrically connected to a pressure difference and pressure sensor (125) provided at both ends of the particle trap SDPF (110); The controller (140) is also electrically connected to the urea nozzle (146) and the third exhaust temperature sensor (149).

10. A control method for a SDPF 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 SDPF (110); Step 5: the controller (140) starts the electric heating device to clean the particle collection barrel (115).

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