阅读说明：本技术 一种基于臭氧进行的dpf主动再生的装置及方法 (Device and method for DPF active regeneration based on ozone ) 是由 雷艳 刘晨曦 仇滔 马雪健 于 2021-08-10 设计创作，主要内容包括：一种基于臭氧进行的DPF主动再生的装置及方法涉及尾气后处理领域。在DPF工作过程中,微粒会沉积在过滤器内,当达到一定值时,就会导致发动机动力性和经济性等性能下降,因此必须通过DPF再生的方式及时除去沉积的微粒,以此保证DPF正常运行。本发明依据在一定温度下(200-240℃范围内)臭氧气体对颗粒物具有强氧化的效果,可以高效快速地将颗粒物转化为二氧化碳。该装置包括臭氧发生器、热泵、风机等设备对DPF系统对碳颗粒进行再生,最终对DPF中的PM进行高效地去除。该发明还包括了应用该装置的检测方法。该专利有利于DPF的长期高效使用。(A DPF active regeneration device and method based on ozone relates to the field of tail gas aftertreatment. During the operation of the DPF, particulates are deposited in the filter, and when a certain value is reached, performance such as engine dynamic performance and economical efficiency is reduced, so that the deposited particulates must be removed in time by means of DPF regeneration, thereby ensuring normal operation of the DPF. According to the invention, the ozone gas has a strong oxidation effect on the particulate matters at a certain temperature (within the range of 200-240 ℃), and the particulate matters can be efficiently and quickly converted into carbon dioxide. The device comprises an ozone generator, a heat pump, a fan and other equipment, and is used for regenerating carbon particles by a DPF system and finally efficiently removing PM in the DPF. The invention also comprises a detection method applying the device. This patent is favorable to the long-term high-efficient use of DPF.)

1. The system for regenerating the DPF is characterized by comprising a fan (1), an ozone generator (7), a heat pump (5), a DPF reaction box (8) and a controller (13); the gas outlet end of the ozone generator is connected with a spraying pipeline provided with a safety valve (19) to supply ozone gas to a starting pipe (17) of a DPF regeneration branch; the purpose of regulating the mass flow of ozone is achieved through the mass flow controller; the heat pump (5) controls the temperature of the internal environment of the DPF by receiving signals of the controller, so that the temperature of exhaust gas flowing into the DPF reaction box (8) is maintained within the range of 200-240 ℃ when the DPF is regenerated, and the controller receives signals of the temperature sensor and the pressure sensor and then enables the ozone generator to generate ozone gas by starting the power supply of the ozone generator to regenerate carbon deposition in the DPF reaction box;

the fan (1) and the heat pump are both positioned on the DPF regeneration branch starting pipe (17);

the DPF regeneration main circuit starting pipe (15) is connected with a DPF regeneration branch circuit starting pipe (17), and the DPF regeneration main circuit starting pipe (15) is connected with an inlet of a DPF reaction box (8); the outlet of the DPF reaction box (8) is connected with a DPF regeneration main path tail pipe (16);

the DPF regeneration main road tail pipe (16) is provided with a flange plate at one side of the pipeline and is connected with a DPF regeneration branch road tail pipe (18) in a flange mode;

the DPF regeneration branch tail pipe (18) is provided with a flange plate at one side of the pipeline and is connected with an ozone generator in a flange mode, and the DPF regeneration branch tail pipe (18) is connected with a DPF regeneration branch starting pipe (17).

2. The system according to claim 1, characterized in that the controller is connected with a first temperature sensor (4), a second temperature sensor (14), a first differential pressure sensor (3), a second differential pressure sensor (10), a third differential pressure sensor (11) and a pressure sensor (2), respectively; the first temperature sensor (4) and the second temperature sensor (14) are respectively used for detecting the exhaust temperature and the temperature in the DPF reaction box (8); the first differential pressure sensor and the second differential pressure sensor are used for detecting the differential pressure of the front end and the rear end of the DPF reaction box; the third differential pressure sensor (11) is used for detecting the differential pressure at the tail pipe of the DPF regeneration branch circuit to prevent gas leakage; the pressure sensor (2) controls the flow rate of the gas by measuring the pressure of the gas in the whole regeneration system; finally, the purpose of controlling the work of the vehicle-mounted ozone generator and the DPF system is achieved in a real-time signal mode.

3. A method for using the system of claim 1, comprising the steps of:

the method comprises the following steps: the method comprises the following steps of (1) independently disassembling a DPF reaction box on a vehicle, installing the DPF reaction box between a DPF regeneration main road starting pipe (15) and a DPF regeneration main road tail pipe (16), installing an ozone generator (7) on the DPF regeneration branch road starting pipe (17), and finally connecting the DPF regeneration main road starting pipe (15), the DPF regeneration main road tail pipe (16), the DPF regeneration branch road starting pipe (17) and the DPF regeneration branch road tail pipe (18) by flanges;

step two: because the maximum pressure difference at two ends accepted by the DPF reaction box (8) is different under different working conditions, the calibration rotating speed working condition of a diesel engine on a vehicle where the DPF reaction box is located is taken as a standard, a calibration test is carried out on the diesel engine in advance according to the structural parameters of a DPF system to be regenerated, and the upper limit threshold value delta p of the pressure difference at two ends of the DPF reaction box (8) is measured_MAnd a target differential pressure threshold value δ p at the completion of regeneration₀；

Step three: starting a heat pump and a fan in the regeneration system, closing an ozone generator, and measuring a real-time differential pressure threshold value delta p of a DPF reaction box (8);

step four: on the basis of the second step and the third step, the flow rate of gas entering the DPF reaction box (8) is adjusted by adjusting the power of the fan, the data of the pressure sensor (2) are recorded, the lowest flow rate of the gas in the pipe required by the reaction is determined, and the value p of the pressure sensor (2) is measured under the flow rate₁Storing the data into a controller;

step five: after the completion of the above steps, the regeneration of the DPF reaction tank (8) is started in full. The controller monitors the differential pressure delta p at the front end and the rear end of the DPF through the first differential pressure sensor (3) and the second differential pressure sensor (10), and the differential pressure delta p is pre-stored in the controller_MA comparison is made to determine whether regeneration is required: when deltap is more than or equal to the target differential pressure threshold deltap₀And is less than or equal to the differential pressure upper limit threshold value deltap_MWhen the regeneration is needed, the DPF reaction box (8) is represented;

step six: after the regeneration is determined to be needed, the controller starts the heat pump and the fan, the fan and the heat pump start to work, and the controller pre-stores gas in the controller through data of the pressure sensor (2)Pressure value p at minimum flow rate required for body₁Comparing to adjust the power of the fan, and simultaneously controlling the power of the heat pump by the controller according to the data of the second temperature sensor (14) to maintain the temperature in the DPF reaction box (8) within the temperature window of 200-240 ℃;

step seven: the controller sends out a signal to start the ozone generator and open the safety valve (19) to turn on O₃Spraying the carbon into a circulating pipeline, and starting to regenerate the carbon deposit in the DPF reaction box (8);

step eight: when the controller monitors that the differential pressure deltap at the front end and the rear end of the DPF reaction box is reduced through the first differential pressure sensor (3) and the second differential pressure sensor (10), a signal is sent to the ozone generator to reduce O₃Mass flow to avoid O₃Excessive generation causes environmental pollution; when the controller monitors that the differential pressure deltap at the front end and the rear end of the DPF reaction box is less than or equal to the DPF, the target differential pressure threshold deltap is obtained when regeneration is finished₀The regeneration is considered to be finished when the regeneration is finished; the controller sends out a signal to the ozone generator to close the injection system.

Technical Field

The invention relates to the technical field of automobile exhaust aftertreatment, in particular to a DPF active regeneration device and method.

Background

The diesel engine has the advantages of good fuel economy, high reliability, high thermal efficiency, long service life and the like, and is widely applied to the fields of transportation, industrial and agricultural production and the like. The main pollutant discharged by diesel engine is nitrogen oxide (NO for short)_x) And Particulate Matter (PM), especially PM,seriously harming human health. In recent years, increasingly stringent emission regulations have placed higher demands on diesel PM emissions. The Diesel Particulate Filter (DPF) technology is considered to be the most effective aftertreatment means for reducing PM at present, and the collection efficiency can reach more than 90%. However, as the DPF becomes clogged with the PM trapped in the exhaust gas, the DPF becomes clogged, and as a result, the exhaust back pressure of the diesel engine increases, the performance decreases, the fuel consumption increases, and the like.

Conventional DPF regeneration modes are mainly divided into active regeneration and passive regeneration. The active regeneration comprises oil injection heating regeneration, electric heating regeneration, microwave heating regeneration, infrared heating regeneration and other heat regeneration modes. The thermal regeneration technology mainly utilizes an external energy source to heat so as to burn off PM deposited on the DPF. Passive regeneration mainly includes catalytic regeneration and continuous regeneration. The active regeneration mode has higher economical efficiency and practicability because a certain workload is reduced.

The active regeneration process of the DPF used in the industry today often has the following problems:

as the life of diesel engines increases, mechanical wear increases, causing the DPF to contain some diesel and even lubricant during the collection of carbon particulates, which have a lower ignition point than carbon particulates. In the regeneration process, the temperature is continuously increased, diesel oil is separated out from particles to form oil vapor, and when the temperature of the oil vapor reaches the ignition point of the diesel oil, the diesel oil starts to be burnt violently, then the temperature is increased to cause violent burning of carbon particles, finally the regeneration process is out of control, a DPF core body is burnt, and even safety accidents can be caused when the regeneration process is serious.

Ozone (hereinafter referred to as O)₃) As a strong oxidant, the composite has the advantages of high efficiency, good purification effect and capability of treating various pollutants in the field of pollutant treatment. O is₃PM can be oxidized to CO through a series of chemical reactions with PM deposited within the DPF₂Therefore, the aims of removing PM and actively regenerating the DPF are fulfilled. At the same time, O₃The optimum reaction temperature range with PM is 200-240 deg.C, far below the light-off temperature of PM, in this temperature rangeInner O₃The activation energy of the chemical reaction with PM is the highest, and the reaction degree is the most violent. Therefore, compared with thermal regeneration, the active regeneration mode is safer and more reliable, and has great application prospect.

Disclosure of Invention

The object of the present invention consists of devising a device and a method for the active regeneration of a DPF, so that in an off-line situation, the active regeneration of the particulate matter in the DPF can be carried out by strong oxidation of ozone by detaching and mounting the DPF system mounted on the vehicle separately.

The invention realizes the technical purpose by the following technical means:

the system for regenerating the DPF is characterized by comprising a fan (1), an ozone generator (7), a heat pump (5), a DPF reaction box (8) and a controller (13); the gas outlet end of the ozone generator is connected with a spraying pipeline provided with a safety valve (19) to supply ozone gas to a starting pipe (17) of a DPF regeneration branch; the purpose of regulating the mass flow of ozone is achieved through the mass flow controller; the heat pump (5) controls the temperature of the internal environment of the DPF by receiving signals of the controller, so that the temperature of exhaust gas flowing into the DPF reaction box (8) is maintained within the range of 200-240 ℃ when the DPF is regenerated, and the controller receives signals of the temperature sensor and the pressure sensor and then enables the ozone generator to generate ozone gas by starting the power supply of the ozone generator to regenerate carbon deposition in the DPF reaction box;

the fan (1) and the heat pump are positioned on a DPF regeneration branch starting pipe (17);

the DPF regeneration main circuit starting pipe (15) is connected with a DPF regeneration branch circuit starting pipe (17), and the DPF regeneration main circuit starting pipe (15) is connected with an inlet of a DPF reaction box (8); the outlet of the DPF reaction box (8) is connected with a DPF regeneration main path tail pipe (16);

the DPF regeneration main road tail pipe (16) is provided with a flange plate at one side of the pipeline and is connected with a DPF regeneration branch road tail pipe (18) in a flange mode;

the DPF regeneration branch tail pipe (18) is provided with a flange plate at one side of the pipeline and is connected with an ozone generator in a flange mode, and the DPF regeneration branch tail pipe (18) is connected with a DPF regeneration branch starting pipe (17).

The controller is respectively connected with a first temperature sensor (4), a second temperature sensor (14), a first differential pressure sensor (3), a second differential pressure sensor (10), a third differential pressure sensor (11) and a pressure sensor (2); the first temperature sensor (4) and the second temperature sensor (14) are respectively used for detecting the exhaust temperature and the temperature in the DPF reaction box (8); the first differential pressure sensor and the second differential pressure sensor are used for detecting the differential pressure of the front end and the rear end of the DPF reaction box; the third differential pressure sensor (11) is used for detecting the differential pressure at the tail pipe of the DPF regeneration branch circuit to prevent gas leakage; the pressure sensor (2) controls the flow rate of the gas by measuring the pressure of the gas in the whole regeneration system; finally, the purpose of controlling the work of the vehicle-mounted ozone generator and the DPF system is achieved in a real-time signal mode.

The method for applying the system is characterized by comprising the following steps:

the method comprises the following steps: the method comprises the following steps of (1) independently disassembling a DPF reaction box on a vehicle, installing the DPF reaction box between a DPF regeneration main road starting pipe (15) and a DPF regeneration main road tail pipe (16), installing an ozone generator (7) on the DPF regeneration branch road starting pipe (17), and finally connecting the DPF regeneration main road starting pipe (15), the DPF regeneration main road tail pipe (16), the DPF regeneration branch road starting pipe (17) and the DPF regeneration branch road tail pipe (18) by flanges;

step two: because the maximum pressure difference at two ends accepted by the DPF reaction box (8) is different under different working conditions, the calibration rotating speed working condition of a diesel engine on a vehicle where the DPF reaction box is located is taken as a standard, a calibration test is carried out on the diesel engine in advance according to the structural parameters of a DPF system to be regenerated, and the upper limit threshold value delta p of the pressure difference at two ends of the DPF reaction box (8) is measured_MAnd a target differential pressure threshold value δ p at the completion of regeneration₀；

Step three: starting a heat pump and a fan in the regeneration system, closing an ozone generator, and measuring a real-time differential pressure threshold value delta p of a DPF reaction box (8);

step four: on the basis of the second step and the third step, the flow rate of gas entering the DPF reaction box (8) is adjusted by adjusting the power of the fan, the data of the pressure sensor (2) are recorded, the lowest flow rate of the gas in the pipe required by the reaction is determined, and the value of the pressure sensor (2) is measured under the flow ratep₁Storing the data into a controller;

step five: after the completion of the above steps, the regeneration of the DPF reaction tank (8) is started in full. The controller monitors the differential pressure delta p at the front end and the rear end of the DPF through the first differential pressure sensor (3) and the second differential pressure sensor (10), and the differential pressure delta p is pre-stored in the controller_MA comparison is made to determine whether regeneration is required: when deltap is more than or equal to the target differential pressure threshold deltap₀And is less than or equal to the differential pressure upper limit threshold value deltap_MWhen the regeneration is needed, the DPF reaction box (8) is represented;

step six: after the regeneration is determined to be needed, the controller starts the heat pump and the fan, the fan and the heat pump start to work, and the controller starts to work according to the data of the pressure sensor (2) and the pressure value p at the lowest flow speed required by the gas prestored in the controller₁Comparing to adjust the power of the fan, and simultaneously controlling the power of the heat pump by the controller according to the data of the second temperature sensor (14) to maintain the temperature in the DPF reaction box (8) within the temperature window of 200-240 ℃;

step seven: the controller sends out a signal to start the ozone generator and open the safety valve (19) to turn on O₃Spraying the carbon into a circulating pipeline, and starting to regenerate the carbon deposit in the DPF reaction box (8);

step eight: when the controller monitors that the differential pressure deltap at the front end and the rear end of the DPF reaction box is reduced through the first differential pressure sensor (3) and the second differential pressure sensor (10), a signal is sent to the ozone generator to reduce O₃Mass flow to avoid O₃Excessive generation causes environmental pollution; when the controller monitors that the differential pressure deltap at the front end and the rear end of the DPF reaction box is less than or equal to the DPF, the target differential pressure threshold deltap is obtained when regeneration is finished₀The regeneration is considered to be finished when the regeneration is finished; the controller sends out a signal to the ozone generator to close the injection system.

The ozone generator (7) also comprises a mass flow meter, a cooling water pump, a valve, a power supply device, an air supply fan and a related connecting pipeline; the power supply device is used for supplying power to the ozone generator (7), the SPA oxygen generation system is arranged in the ozone generator (7) and used for generating ozone, the air supply fan is connected with an air inlet of the ozone generator (7) through a pipeline provided with a mass flow meter, an air outlet of the ozone generator (7) is connected with an injection pipeline provided with a gas control valve, and therefore ozone gas is introduced into the DPF reaction box (8).

The DPF regeneration branch starting pipe (17) is arranged on the front end surface of the DPF reaction box (8); the cooling mode of the ozone generator adopts water-cooled cooling, the water flow of cooling water needs to be more than 15L/min, the water temperature is lower than 30 ℃, and the cooling water enters the inside of the ozone generator from a water inlet and is discharged from a water outlet.

The internal controller of the ozone generator consists of a controller, a power supply module, an air supply fan and a mass flow meter, and the controller is arranged in the vehicle so as to adjust O in real time₃And (4) yield.

DPF regeneration branch road plays pipe (17) trailing end connection has a fan and heat pump, and the main effect of fan is: the flow speed in the starting pipe (17) of the DPF regeneration branch is adjusted, the reaction time is shortened, and the DPF regeneration efficiency is improved;

the main functions of the heat pump are as follows: adjusting the temperature at the tail end of a DPF regeneration main line starting pipe (17) to ensure that the tail gas and O entering a DPF reaction box₃The gas reaches the optimal temperature window of 200 ℃ and 240 ℃, so that the regeneration efficiency of the DPF is improved;

a temperature sensor is arranged in the DPF reaction box (8) to detect the internal temperature T of the DPF reaction box (8); the first temperature sensor and the second temperature sensor are both connected with a controller, and the optimal temperature window 200 and 240 ℃ for DPF regeneration is prestored in the controller; the heat pump (5) can change the temperature in the DPF reaction box by changing the temperature of gas entering the DPF reaction box (8), so that the temperature in the DPF reaction box is maintained within the regeneration optimum temperature window of 200 ℃ and 240 ℃;

the first differential pressure sensor (3) and the second differential pressure sensor (10) are respectively arranged at the front end and the rear end of the DPF reaction box (8) and are used for detecting the front-back differential pressure of the DPF reaction box (8); the controller prestores a DPF pressure difference upper limit threshold value deltap_MDifferential pressure intermediate threshold value δ p_mAnd target differential pressure threshold δ p at the completion of DPF regeneration₀Therefore, the first differential pressure sensor (3) and the second differential pressure sensor (10) can judge whether the DPF needs to be regenerated or not by acquiring the differential pressure deltap at the front end and the rear end of the DPF reaction box (8) in real time and comparing the differential pressure deltap with a pressure threshold value prestored in a controller;

the device of the invention has the following beneficial effects: can pass through O in an off-line state₃Effectively absorb the residual carbon deposit in the DPF and convert the carbon deposit into CO₂The DPF active regeneration process is efficiently completed.

The temperature in the DPF reaction box is in the range of 200-240 ℃ in the regeneration process and is far lower than the burning point of carbon particles and diesel oil, so that fuel steam detonation cannot be caused to cause carbon particle detonation in the DPF, and the effects of protecting the DPF and prolonging the service life can be achieved.

Drawings

FIG. 1 is a schematic diagram of a DPF regeneration system according to the present invention;

FIG. 2 is a flow chart illustrating steps for installing the DPF regeneration system of the present invention;

FIG. 3 is a flowchart of the steps of a DPF calibration test and a test for determining the degree of DPF internal blockage according to the present invention;

FIG. 4 is a flowchart illustrating exemplary steps for a DPF regeneration control method according to the present invention.

The reference numbers are as follows:

1-a fan; 2-a pressure sensor; 3-a differential pressure sensor; 4-a temperature sensor; 5-a heat pump; 6-safety valve; 7-an ozone generator; 8-DPF reaction box; 9-differential pressure calculating means; 10-differential pressure sensor; 11-differential pressure sensor; 12-a safety valve; 13-a controller; 14-a temperature sensor; 15-DPF regeneration main line pipe lifting; 16-DPF regeneration trunk tail pipe; 17-DPF regeneration branch starting pipe; 18-DPF regeneration branch tail pipe; 19-safety valve.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second" may

To explicitly or implicitly include one or more of the features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and can include, for example, fixed connections and removable connections

Joined, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The invention is first described in detail below with reference to the accompanying drawings:

as shown in fig. 1, the DPF active regeneration system of the present invention includes a heat pump, a fan, an ozone generator, a DPF reaction chamber, a controller, a plurality of differential pressure sensors, and a temperature sensor, wherein the fan and the heat pump are installed on a DPF regeneration branch starting pipe (17), and both the heat pump and the fan are located on the DPF regeneration branch starting pipe (17);

the DPF regeneration main circuit starting pipe (15) is connected with a DPF regeneration branch circuit starting pipe (17), and the DPF regeneration main circuit starting pipe (15) is connected with an inlet of a DPF reaction box (8); the outlet of the DPF reaction box (8) is connected with a DPF regeneration main path tail pipe (16);

the DPF regeneration main road tail pipe (16) is provided with a flange plate at one side of the pipeline and is connected with a DPF regeneration branch road tail pipe (18) in a flange mode;

the DPF regeneration branch tail pipe (18) is provided with a flange plate at one side of the pipeline and is connected with an ozone generator in a flange mode, and the DPF regeneration branch tail pipe (18) is connected with a DPF regeneration branch starting pipe (17);

the ozone generator control valve, the temperature sensor, the pressure difference sensor and the pressure sensor are all connected with the controller.

The ozone generator safety valve (19) is in a closed state when the ozone generator is stopped, and when the DPF system needs to be regenerated, the ozone generator starts to work to generate O₃Gas, opening safety valve (19), O₃The gas regenerates the DPF through a line.

FIG. 4 is a flow chart illustrating DPF regeneration; before the DPF reactor is used, a DPF system and an ozone generator are calibrated firstly, and an upper limit threshold value delta p of the pressure difference between two ends of a DPF reaction box (8) is measured by taking the calibration rotating speed working condition of a diesel engine on a vehicle where the DPF reactor is positioned as a standard_MAnd a target differential pressure threshold value δ p at the completion of regeneration₀(ii) a Limiting the differential pressure to an upper threshold value δ p_MTarget regeneration pressure difference δ p₀And the minimum flow rate of the gas in the tube required for the reaction, the value p of the pressure sensor (2) being determined by this flow rate₁Storing the data into a controller;

the controller monitors the differential pressure delta p at the front end and the rear end of the DPF through the first differential pressure sensor (3) and the second differential pressure sensor (10), and the differential pressure delta p is pre-stored with the differential pressure upper limit threshold value delta p in the controller_MAnd target differential pressure threshold δ p at the completion of DPF regeneration₀Comparing to judge whether regeneration is needed;

when the controller monitors that the front-end and rear-end differential pressure deltap of the DPF is at the upper differential pressure threshold deltap_MAnd target differential pressure threshold δ p at the completion of DPF regeneration₀In between, the DPF is considered to need regeneration;

at the moment, the controller controls the fan to work by detecting signals transmitted from the pressure sensor (2), and the pressure in the DPF regeneration system is larger than that measured in a calibration test by monitoring the controller and the pressure sensor (2)Pressure value p of₁；

The controller controls the heat pump to work by detecting a signal transmitted by the second temperature sensor (14), and the temperature in the DPF reaction box (8) is kept within the range of the optimal regeneration temperature of 200 ℃ and 240 ℃ by monitoring of the controller and the second temperature sensor (14); after the DPF regeneration is finished, the fan, the heat pump and the ozone generator stop working.

All regeneration processes are carried out in an off-line state, so that the influence on O caused by overlarge exhaust flow and overhigh exhaust temperature is avoided₃The degree of reaction of the gas with soot particles inside the DPF; all DPF regeneration processes are performed within the optimum regeneration temperature range, increasing O₃And the utilization rate of the energy of exhaust waste heat; therefore, the present invention improves DPF regeneration efficiency and effectively saves energy.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that modifications, variations, substitutions and alterations may be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.