CN114658514B - DOC carrying NTP combined regeneration DPF system and control method - Google Patents

DOC carrying NTP combined regeneration DPF system and control method Download PDF

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Publication number
CN114658514B
CN114658514B CN202210132721.2A CN202210132721A CN114658514B CN 114658514 B CN114658514 B CN 114658514B CN 202210132721 A CN202210132721 A CN 202210132721A CN 114658514 B CN114658514 B CN 114658514B
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dpf
ntp
control unit
doc
temperature
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CN114658514A (en
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施蕴曦
周银
蔡忆昔
何勇
卢奕睿
杨寅钦
谢俊峰
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Jiangsu University
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Jiangsu University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/0205—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/04—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids
    • F01N3/043—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids without contact between liquid and exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Abstract

The invention provides a DOC-carried NTP combined regeneration DPF system and a control method, wherein the system mainly comprises a post-treatment system, an NTP injection system, a power supply circuit and a control unit. The post-processing system, the NTP injection system and the power supply circuit are all connected with the control unit, and the control unit adjusts the working state of each system according to signals fed back by each sensor. When the diesel engine is stopped, NTP active substances are sprayed into the exhaust pipe to perform oxidative decomposition reaction with PM in the DPF, so that off-line regeneration of the DPF is realized; when the diesel engine is running, the NTP injection system is controlled to alternately or jointly regenerate the DPF on line in combination with the DOC. The invention can realize the autonomous control of the NTP injection system, realizes the regeneration of the DPF at different exhaust temperatures by combining the online regeneration and the offline regeneration, can effectively widen the regeneration temperature interval of the DPF, and achieves the aim of long-term and high-efficiency use of the DPF.

Description

DOC carrying NTP combined regeneration DPF system and control method
Technical Field
The invention belongs to the technical field of diesel engine tail gas aftertreatment, and particularly relates to a system for carrying NTP (negative temperature coefficient) and jointly regenerating DPF (diesel particulate filter) by a DOC (diesel engine) and a control method.
Background
Diesel particulate matter (Particulate Matter, PM) is fine particles capable of being suspended in air, haze can be formed under certain conditions, plant growth is shielded from sunlight, and potential safety hazards are brought to transportation. And PM can enter the lungs and blood along with human breath, greatly increasing the risk of respiratory diseases and even inducing cancer. As can be seen, diesel PM endangers human health and pollutes the atmospheric environment, which is limited by the issuing of strict emission regulations in various countries. With the ever stricter emissions regulations, there are ever increasing demands on the design and manufacture of diesel aftertreatment systems.
The diesel particulate filter (Diesel Particulate Filter, DPF) technology is the most effective post-treatment means for reducing PM emission at present, and the collection efficiency can reach more than 90%. However, the DPF is clogged due to excessive PM trapping, which causes problems such as an increase in DPF back pressure, a decrease in trapping performance, and an increase in vehicle fuel consumption. Therefore, the key to reducing the PM emission of the diesel engine by using the DPF is regeneration of the DPF, namely, the accumulated PM in the DPF is cleared in time after the DPF is blocked, the working performance of the DPF is recovered, and the service life of the DPF is prolonged.
Conventional DPF regeneration techniques are mainly thermal and catalytic regeneration. The main principle of the thermal regeneration technology is to heat the PM deposited in the DPF by using a higher temperature (> 600 ℃) until the PM is burnt out, so that the effect of regenerating the DPF is achieved. The thermal regeneration is realized mainly by oil injection heating regeneration, microwave heating regeneration, infrared heating regeneration and the like. Thermal regeneration requires higher temperature conditions and the DPF carrier can be damaged by localized overheating. The catalytic regeneration technology can greatly reduce the initial temperature of PM oxidation reaction, but the temperature window for keeping the activity of the catalyst is narrower, and the requirement on oil products is higher. Therefore, the conventional DPF regeneration technology has certain drawbacks and certain limitations in specific applications.
Currently, the main technical route of diesel particulate exhaust aftertreatment is to use CDPF (Catalytic Diesel Particulate Filter, CDPF) and a pre-oxidation catalytic converter (Diesel Oxidation Catalyst, DOC) as a combined system, and to realize PM removal and DPF regeneration synchronously by combining active and passive regeneration. It has been shown that DOC has high SOF purification efficiency (over 80%) in particulate matter at low temperature of 300 deg.C, and has about 30% of total PM purification rate, but almost no degradation effect on dry soot in PM. In addition, the DOC may also convert NO in the exhaust gas to NO that is extremely oxidizing 2 Oxidation reaction with PM deposited in CDPF main channel and wall flow channel to realize DPFAnd (5) dynamic regeneration. The DOC oxidizes diesel oil to release heat, so that the temperature of the DPF is raised to reach the ignition point of PM, and further active regeneration of the DPF is realized. The DOC can convert NO from the engine into NO only at a temperature of more than 250 DEG C 2 Is provided to the DPF for decomposing PM. When the exhaust temperature is above 400 ℃, the catalyst coated inside the CDPF may undergo a reverse reaction, promoting SO 2 Oxidation to SO 3 Combined with water to produce sulfuric acid; in addition, the influence of the temperature characteristic of the DOC is considered, the influence of a plurality of factors such as the fuel spray characteristic, the fuel spray pressure, the fuel spray time, the fuel spray quantity and the like of the fuel injector is considered, and high requirements are put forward on a control strategy. Current technical reserves have not moved DPFs out of service limits and manufacturers and researchers are struggling to develop alternative strategies.
Low temperature Plasma (NTP) is a highly efficient clean diesel exhaust aftertreatment technique that removes PM deposited in the DPF. The NTP technology takes air as an air source, and O can be generated after the discharge effect of an NTP generator 3 、NO 2 The active substances and PM can be subjected to oxidative decomposition reaction at a lower temperature (less than 300 ℃), so that DPF regeneration can be realized. Due to NTP main active substance (O) 3 ) The high-efficiency temperature interval of the NTP regenerated DPF is below 200 ℃.
CN107747505B, entitled "a system and control method for alternately regenerating a DPF using engine exhaust gas", sets a DPF parallel mode, and introduces exhaust gas to the front end of the regenerating DPF by a bi-directional gas supply pump, and regenerates the DPF by the synergistic effect of the gas component in the exhaust gas and the active material generated by the NTP generator. However, in the patent, when the temperature is high, a temperature control device is additionally arranged to control the temperature of the DPF in a regeneration interval suitable for NTP, so that the energy loss is increased.
CN110030071B, entitled "a DPF regeneration system and control method for optimizing thermal management", in the diesel engine operation process, the temperature control system is adjusted to cool the DPF system, the temperature of the DPF is properly reduced, when the DPF is stopped for regeneration, active substances generated by the NTP generator are sprayed into the DPF, the active substances and PM in the DPF undergo oxidation reaction, and the thermal medium can be used as a heat source, so that the regeneration process is stably performed. However, the DPF regeneration described in this patent occurs only when the diesel engine is shut down, and does not take into account the regeneration requirements under actual operating conditions of the vehicle.
In addition, the current DOC+CDPF technical route also has the problems of narrow effective regeneration temperature window of DPF, easy deactivation of CDPF catalyst and the like. Therefore, there is a need for a DPF regeneration strategy that can be used in diesel engine operating or shut down conditions, full exhaust temperature coverage, low energy consumption, low cost, and high efficiency.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an off-line and on-line combined DPF regeneration mode, and the regeneration temperature of the DPF is widened by combining NTP with DOC, so that a DPF regeneration strategy with low energy consumption, low cost and high efficiency is realized.
In order to achieve the aim of the invention, the invention adopts the following technical scheme: the system comprises a diesel engine and an NTP injection system, wherein the DOC is provided with the NTP and the DPF; the DOC is installed upstream of the DPF; the DOC oxidizes NO in the exhaust gas to NO 2 And regenerating the DPF in cooperation with the NTP injection system; the NTP injection system comprises an NTP generator, an air supply pump, an injection pipe, an electronic flowmeter and an electromagnetic valve, wherein the injection pipe is arranged at the downstream of the DOC and the upstream of the DPF, and the air supply pump is connected with the NTP generator through the electronic flowmeter; the active material generated by the NTP generator is injected into the DPF through an injection pipe by opening and closing the electromagnetic valve.
In the above scheme, the NTP generator comprises an air inlet end, an air outlet end, an inlet and an outlet, and an air source provided by the air supply pump enters the NTP generator through the air inlet end and flows into the injection pipe from the air outlet end.
In the above scheme, the NTP injection system further comprises a cooling liquid tank, an NTP temperature monitor and a cooling pump, wherein the cooling liquid tank flows cooling liquid into the NTP generator from an inlet through the cooling pump, and flows back into the cooling liquid tank from an outlet, and the surface temperature of the NTP generator is monitored by the NTP temperature monitor.
In the scheme, the pressure difference between the front end and the rear end of the DPF is measured by a pressure sensor; the temperature in the DPF is measured by a temperature sensor; the valve is in diesel oilWhen the machine is stopped, the machine is started, and the oxidative decomposition products of the active substances and PM flow through the valve to pass through CO 2 A sensor; the pressure sensor, the temperature sensor and the CO 2 The sensor is connected with the control unit through a wire.
In the above scheme, the diesel engine and the NTP generator are connected with a power supply device; the power supply device supplies power to the NTP generator, the control voltage is 17 kV-23 kV, and the discharge frequency is 7 kHz-10 kHz, so that the NTP generator breaks down the air source to generate active substances.
In the scheme, the control unit regulates the air source flow through regulating and controlling the air supply pump according to the air source flow fed back by the electronic flowmeter;
in the above scheme, the control unit adjusts the surface temperature of the NTP generator by adjusting and controlling the flow of the cooling liquid flowing out of the cooling liquid tank according to the surface temperature of the NTP generator fed back by the NTP temperature monitor.
In the above scheme, the control unit is used for controlling the flow rate of the exhaust gas according to the pressure sensor feedback parameter (differential pressure between two ends of the DPF), the temperature sensor feedback parameter (internal temperature of the DPF), and the CO 2 Sensor feedback parameters (PM oxidative decomposition products CO in DPF) 2 Concentration) to control the start and stop of the diesel engine and the start and stop of the NTP generator.
The invention also provides a control method of the DOC carrying NTP combined regeneration DPF system, which comprises the following steps:
step one: performing a calibration test on the DPF to determine a differential pressure lower limit threshold delta P of the DPF to be regenerated when the diesel engine is running min Upper differential pressure threshold Δp max Regeneration target differential pressure Δp 0 . And stores it in the control unit; experiments prove that the lowest temperature for completely decomposing the NTP active substances after being heated is 300 ℃, namely the effective temperature for regenerating the DPF by the NTP is lower than 300 ℃, and the temperature is stored in the control unit. When the diesel engine is stopped, the corresponding CO in the complete regeneration is determined through an NTP regeneration DPF test 2 Concentration C m And storing in a control unit; step two: the control unit starts the diesel engine, monitors signals transmitted by the pressure sensor and the temperature sensor, and compares the real-time differential pressure delta P and delta P of the front end and the rear end of the DPF max Is of the size of (a) and the interior of the DPF is real-timeThe temperature T and the temperature of 300℃:
(a) If ΔP is greater than or equal to ΔP max The control unit starts an NTP injection system to regenerate the DPF, when the temperature of the exhaust is 250-300 ℃, the NTP and the DOC jointly regenerate the DPF, and when the temperature of the exhaust is lower than 250 ℃, the NTP independently regenerates the DPF; the control unit continuously monitors the DPF front-rear end differential pressure delta P, and compares delta P with delta P 0 Is of a size of (2); if ΔP is less than or equal to ΔP 0 The DPF regeneration is ended, otherwise, the control unit continuously starts the NTP injection system to regenerate the DPF;
(b) If ΔP is greater than or equal to ΔP max The control unit controls the diesel engine to stop when T is more than or equal to 300 ℃, and continuously monitors signals transmitted by the temperature sensor; if T is less than 300 ℃, the control unit starts the NTP injection system and monitors CO 2 Comparing the signal transmitted by the sensor with real-time CO generated by the oxidative decomposition reaction of the NTP active substance and PM in the DPF 2 Concentrations C and C m Is of a size of (2); if C is less than or equal to C m The DPF regeneration is ended, otherwise, the control unit continuously starts the NTP injection system to regenerate the DPF;
step three: the control unit monitors the signal transmitted by the pressure sensor and compares delta P with delta P min Is of the size of (2):
(c) If ΔP is less than or equal to ΔP min The diesel engine is normally operated;
(d) If ΔP is greater than or equal to ΔP min The control unit monitors signals transmitted by the temperature sensor and compares the T with 300 ℃; if T is less than 300 ℃, the system flow is the same as that in the step (a); if T is more than or equal to 300 ℃, the control unit monitors the signal transmitted by the pressure sensor (207), and compares delta P with delta P max Is of a size of (2); if ΔP is greater than or equal to ΔP max The system flow is the same as that in the step (b), otherwise, the control unit continuously monitors the signal transmitted by the temperature sensor, and the DOC oxidizes NO in the exhaust gas into NO 2 ，NO 2 The PM in the DPF is oxidized, and the DPF is regenerated.
The invention has the beneficial effects that: (1) According to the invention, the control unit is used for controlling the NTP injection system and the DOC are combined to perform alternating or combined action, so that the DPF is regenerated at different exhaust temperatures, and the regeneration temperature interval of the DPF can be effectively widened and inclined to a low temperature section; (2) DPF regeneration is carried out by adopting a relatively efficient regeneration mode in the running or stopping process of the diesel engine, and the purpose of long-term and efficient use of the DPF is realized by combining the on-line regeneration and the off-line regeneration of the DPF.
Drawings
Fig. 1 is a schematic structural diagram of a DOC-carried NTP combined regeneration DPF system according to the present invention.
Fig. 2 is a schematic diagram of an NTP generator device according to the present invention.
Fig. 3 is a schematic diagram illustrating exemplary steps of a DOC-carried NTP combined regeneration DPF control method according to the present invention.
In the figure: a 100-diesel engine; 201-exhaust pipe; 202-DOC;203-DPF;204—a temperature sensor; 205-valve; 206-CO2 sensor; 207-pressure sensor; a 300-NTP generator; 301-cooling liquid tank; 302, a cooling water pump; 303-an electronic flowmeter; 304-a gas supply pump; 305-NTP temperature monitor; 306-a jet pipe; 307-solenoid valve 400-power supply means; 500-a control unit; 3001-air inlet end; 3002-outlet end; 3003-inlet; 3004-outlet.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific examples, it being understood that the invention is not limited to the examples below, but is capable of modification in any form or variation falling within the scope of the invention. The methods in the examples described below, unless otherwise indicated, are all conventional in the art.
As shown in fig. 1, a schematic diagram of the result of the DOC-combined NTP regeneration DPF system according to the present invention includes a diesel engine 100, an exhaust pipe 201, a DOC202, a DPF203, a temperature sensor 204, a valve 205, a CO2 sensor 206, a pressure sensor 207, an NTP generator 300, a coolant tank 301, a coolant pump 302, an electronic flowmeter 303, an air supply pump 304, an NTP temperature monitor 305, an injection pipe 306, a solenoid valve 307, a power supply device 400, and a control unit 500. The DOC combined NTP regeneration DPF system structure mainly comprises a diesel engine 100, an NTP injection system, a post-treatment system and a power supply circuit; the exhaust pipe 201 is connected with a DOC202 and a DPF203; the air supply pump 304 sucks air as an air source, and the air source flows through the electronic flowmeter 303 and is transmitted to the NTP generator 300; the control unit 500 controls the opening and closing of the electromagnetic valve 307, the NTP generator 300 generates active substances, and the active substances are sprayed into the DPF203 through the spraying pipe 306; the injection pipe 203 is installed downstream of the DOC202 and upstream of the DPF203; the pressure sensor 207 monitors the DPF front-to-rear end differential pressure; the temperature sensor 204 monitors DPF internal temperature; the CO2 sensor 206 monitors carbon oxides generated by oxidation reaction of the active material with PM in the DPF203; the valve 205 is opened when the diesel engine is stopped, so that DPF regeneration products are led into the CO2 sensor 206; the power supply device 400 supplies power to the air supply pump 304, the electronic flowmeter 303, the NTP generator 300 and the diesel engine 100; the cooling liquid tank 301 pumps cooling liquid into the NTP generator 300 through the cooling pump 302; the NTP temperature monitor 305 monitors the surface temperature of the NTP generator 300; the electric control unit is connected with the diesel engine 100, the post-processing module, the NTP injection system and the power supply circuit, and the working state of the system is adjusted by monitoring signals fed back by the sensors.
As shown in fig. 2, the NTP generator 300 according to the present invention has an internal structure, and the air source enters the NTP generator 300 through the air inlet end 3001 and flows into the injection tube 306 from the air outlet end 3002; the coolant flows into the NTP generator 300 from the inlet 3003 and flows back into the coolant tank 301 from the outlet 3004.
As shown in fig. 3, in the flowchart of the DOC-carried NTP combined regeneration DPF according to the present invention, before use, a calibration test is first performed on the DPF203 to determine the differential pressure lower threshold Δp at which the DPF needs to be regenerated when the DPF203 is operating in the diesel engine 100 min Upper differential pressure threshold Δp max Regeneration target differential pressure Δp 0 . And stores it in the control unit 500; experiments confirm that the lowest temperature at which the NTP active substance is completely decomposed by heat is 300 ℃, i.e., the effective temperature of the NTP regenerated DPF is lower than 300 ℃, and the temperature is stored in the control unit 500. When the diesel engine is stopped, the CO when the regeneration requirement is finished is determined through an NTP regeneration DPF test 2 Concentration C m And stored in the control unit 500.
After the diesel engine 100 is started, the control process is started; control proceeds to 602, where the control unit 500 monitors the signal transmitted from the pressure sensor 207 and compares the front and rear of the DPF203End-to-real time differential pressure ΔP and ΔP max If ΔP is greater than or equal to ΔP max The control step goes to 603, where the control unit 500 monitors the signal transmitted by the temperature sensor 204 and compares the real-time temperature T inside the DPF203 with the temperature of 300 °:
(a) If T is less than 300 ℃, the control step is 608-609, the control unit 500 starts an NTP injection system to regenerate the DPF, and when the temperature of the exhaust gas is 250-300 ℃, the NTP300 and the DOC202 jointly regenerate the DPF203; the NTP300 alone regenerates the DPF203 when the exhaust temperature is below 250 ℃. The control unit 500 continuously monitors the differential pressure Δp between the front and rear ends of the DPF203, and compares Δp with Δp 0 Is of a size of (2); if ΔP is less than or equal to ΔP 0 Control proceeds to step 610 where the dpf203 regeneration is completed and otherwise returns to step 608.
(b) If T is more than or equal to 300 ℃, the control step is 604-605, the control unit 500 controls the diesel engine 100 to stop, and continuously monitors the signal transmitted by the temperature sensor 204; if T is less than 300 ℃, the control steps are 606-607, the control unit 500 starts the NTP injection system and monitors CO 2 The signal transmitted by the sensor 206 compares the NTP active material with the real-time CO generated by the oxidative decomposition reaction of PM within the DPF203 2 Concentrations C and C m Is of a size of (2); if C is less than or equal to C m Control proceeds to 610 where the dpf203 regeneration is complete and otherwise returns to control 606.
If the control step goes to 602, the measured ΔP is smaller than ΔP max Then the control step goes to 611, and the control unit 500 monitors the signal transmitted by the pressure sensor 207 and compares Δp with Δp min Is of the size of (2):
(a) If DeltaP < DeltaP min Control proceeds to 602 where the diesel engine 100 is operating normally.
(b) If ΔP is greater than or equal to ΔP min Control proceeds to 612, where control unit 500 monitors the signal transmitted by temperature sensor 204 and compares T to 300 ℃; if T is less than 300 ℃, the system flow is the same as that in the step (a); if T is greater than or equal to 300 ℃, the control step enters 613, the control unit 500 monitors the signal transmitted by the pressure sensor 207, and compares ΔP with ΔP max Is of a size of (2); if ΔP is greater than or equal to ΔP max The system flow is the same as (b) in the second step, otherwise, the control is returnedIn step 612, the control unit 500 continuously monitors the signal transmitted by the temperature sensor 204, and the DOC202 oxidizes NO in the exhaust gas to NO 2 ，NO 2 The PM in the DPF is oxidized, and the DPF203 is regenerated.
The examples are preferred embodiments of the present invention, but the present invention is not limited to the above-described embodiments, and any obvious modifications, substitutions or variations that can be made by one skilled in the art without departing from the spirit of the present invention are within the scope of the present invention.

Claims (5)

1. A control method of a system for carrying NTP (negative temperature coefficient) and jointly regenerating DPF (diesel engine) by a DOC (DOC), the system comprises a diesel engine (100) and an NTP injection system, and is characterized in that a DOC (202) and a DPF (203) are installed in an exhaust pipe (201) of the diesel engine (100); the DOC (202) is installed upstream of the DPF (203); the DOC (202) oxidizes NO in the exhaust gas to NO 2 And regenerating the DPF (203) in cooperation with the NTP injection system; the NTP injection system comprises an NTP generator (300), an air supply pump (304), an injection pipe (306), an electronic flowmeter (303) and a solenoid valve (307), wherein the injection pipe (306) is arranged at the downstream of the DOC (202) and at the upstream of the DPF (203), and the air supply pump (304) is connected with the NTP generator (300) through the electronic flowmeter (303); the active substances generated by the NTP generator (300) are sprayed into the DPF (203) through an injection pipe (306) by opening and closing an electromagnetic valve (307), and the pressure difference between the front end and the rear end of the DPF (203) is measured through a pressure sensor (207); -the temperature inside the DPF (203) is measured by a temperature sensor (204); the valve (205) is opened when the diesel engine (100) is stopped, and the oxidative decomposition products of the active substances and PM flow through the valve (205) and pass through CO 2 A sensor (206); the pressure sensor (207), the temperature sensor (204) and CO 2 The sensor (206) is connected with the control unit (500) through a wire, and is characterized by comprising the following steps:
step one: performing a calibration test on the DPF (203) to determine a differential pressure lower threshold delta P at which the DPF is to be regenerated when the diesel engine (100) is running min Upper differential pressure threshold Δp max Regeneration target differential pressure Δp 0 And stores it in the control unit (500); determination of NTP active substances by experimentThe minimum temperature of the solution is 300 ℃, namely the effective temperature of the NTP regenerated DPF is required to be lower than 300 ℃, the temperature is stored in the control unit (500), and when the diesel engine (100) is stopped, the corresponding CO in the complete regeneration is determined through the NTP regenerated DPF test 2 Concentration C m And stored in a control unit (500);
step two: the control unit (500) starts the diesel engine (100), monitors signals transmitted by the pressure sensor (207) and the temperature sensor (204), and compares the real-time differential pressure delta P and delta P of the front end and the rear end of the DPF (203) max And the magnitude of the real-time temperature T and 300 ℃ inside the DPF (203):
(a) If ΔP is greater than or equal to ΔP max The control unit (500) starts an NTP injection system to regenerate the DPF, when the temperature of the exhaust gas is 250-300 ℃, the NTP (300) and the DOC (202) jointly regenerate the DPF (203), and when the temperature of the exhaust gas is lower than 250 ℃, the NTP (300) independently regenerates the DPF (203); the control unit (500) continuously monitors the differential pressure delta P of the front and rear ends of the DPF (203), and compares delta P with delta P 0 Is of a size of (2); if ΔP is less than or equal to ΔP 0 The DPF (203) is regenerated, otherwise the control unit (500) continuously starts the NTP injection system to regenerate the DPF;
(b) If ΔP is greater than or equal to ΔP max The control unit (500) controls the diesel engine (100) to stop when T is more than or equal to 300 ℃, and continuously monitors signals transmitted by the temperature sensor (204); if T is less than 300 ℃, the control unit (500) starts the NTP injection system and monitors CO 2 The signal transmitted by the sensor (206) is compared with real-time CO generated by the oxidative decomposition reaction of the PM in the DPF (203) and the NTP active substance 2 Concentrations C and C m Is of a size of (2); if C is less than or equal to C m The DPF (203) is regenerated, otherwise the control unit (500) continuously starts the NTP injection system to regenerate the DPF;
step three: the control unit (500) monitors the signal transmitted by the pressure sensor (207), compares ΔP with ΔP min Is of the size of (2):
(c) If ΔP is less than or equal to ΔP min The diesel engine (100) is normally operated;
(d) If ΔP is greater than or equal to ΔP min The control unit (500) monitors signals transmitted by the temperature sensor (204) and compares the T with 300 ℃; if T is less than 300 ℃, the system flow and stepsIn the second, the (a) is the same; if T is more than or equal to 300 ℃, the control unit (500) monitors the signal transmitted by the pressure sensor (207), and compares delta P with delta P max Is of a size of (2); if ΔP is greater than or equal to ΔP max The system flow is the same as that in the second step (b), otherwise, the control unit (500) continuously monitors the signal transmitted by the temperature sensor (204), and the DOC (202) oxidizes NO in the exhaust gas to NO 2 ，NO 2 The PM in the DPF is oxidized, and the DPF (203) is regenerated.
2. A control method of a DOC-carried NTP combined regeneration DPF system according to claim 1, characterized in that the NTP generator (300) comprises an air inlet end (3001), an air outlet end (3002), an inlet (3003) and an outlet (3004), and that an air source provided by an air supply pump (304) enters the NTP generator (300) through the air inlet end (3001) and flows from the air outlet end (3002) into the injection pipe (306).
3. A control method of a DOC-carried NTP combined regeneration DPF system according to claim 2, characterized in that the NTP injection system further comprises a coolant tank (301), an NTP temperature monitor (305) and a cooling pump (302), the coolant tank (301) flowing coolant from an inlet (3003) to an NTP generator (300) through the cooling pump (302) and from an outlet (3004) back to the coolant tank (301), the NTP generator (300) surface temperature being monitored by the NTP temperature monitor (305).
4. The method for controlling a DOC-carried NTP combined regeneration DPF system according to claim 1, wherein the diesel engine (100) and NTP generator (300) are connected to a power supply means (400); the power supply device (400) supplies power to the NTP generator (300), the control voltage is 17 kV-23 kV, the discharge frequency is 7 kHz-10 kHz, and the NTP generator (300) breaks down the air source to generate active substances.
5. The control method of a DOC-carried NTP combined regeneration DPF system according to claim 1, characterized in that the control unit (500) adjusts the air supply flow by regulating the air supply pump (304) according to the air supply flow fed back by the electronic flowmeter (303).
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