CN103511042A - Diesel engine filter active regeneration control method and system - Google Patents
Diesel engine filter active regeneration control method and system Download PDFInfo
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- CN103511042A CN103511042A CN201310432870.1A CN201310432870A CN103511042A CN 103511042 A CN103511042 A CN 103511042A CN 201310432870 A CN201310432870 A CN 201310432870A CN 103511042 A CN103511042 A CN 103511042A
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- 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 discloses a diesel engine filter active regeneration control method and system. The system comprises an oxygen sensor, an air entraining pipeline, a valve and a control unit, wherein the oxygen sensor is located at the front end of an exhaust pipeline and is used for monitoring the oxygen content of exhaust in real time and sending detection results to an electric control unit, the air entraining pipeline is a pipeline led out from an air compressor of the engine or from a gas cylinder and is located on the part, in front of the oxygen sensor, of the exhaust pipeline, and the valve is located in the air entraining pipeline and is used for controlling the air flow led out from the air compressor or from the gas cylinder according to commands of the electric control unit. According to the diesel engine filter active regeneration control method and system, during DPF active regeneration, fresh air is introduced into the exhaust to increase the oxygen content of the exhaust, and therefore full burning of carbon granules during regeneration can be guaranteed, regeneration efficiency is improved, and regeneration emission is reduced.
Description
Technical field
The present invention relates to mechanical field, particularly a kind of diesel filter initiative regeneration controlling method and system.
Background technique
The main noxious emission of diesel engine is particulate matter, and wherein major part is comprised of the molecule of carbon or carbide.Particulate matter trap DPF (Diesel Particulate Filter) is a kind of filtrating equipment being arranged in vent systems, major function is by its seizure before particulate matter enters atmosphere, the particulate emissions capturing is burnt totally in vehicle operation, can reduce the cigarette ash that diesel engine produces and reach more than 90%.The working principle of particulate matter trap is: the upper metal platinum of diesel particulate filter spraying, palladium, the black smoke that contains carbon granules that diesel engine is got rid of, by special pipeline, enter motor exhaust particle trapper, through the belt filter of its inner intensive setting, carbon soot particles is adsorbed on the filter that metal fiber felt makes; After acquiring a certain degree for the extent of adsorption of example, the burner auto-ignition combustion of tail end, just adsorbs superincumbent carbon soot particles and burns, and becomes harmless carbon dioxide and gets rid of.
During DPF initiative regeneration, in outlet pipe, oxygen concentration is lower, cause carbon granule there is no enough oxygen supports in DPF internal-combustion, regeneration effect is not good, and cause regenerating effulent such as: carbon monoxide, PM discharge amount all exceed 1～2 order of magnitude of normal discharge amount.
Summary of the invention
In order to address the above problem, the object of the invention is to provide a kind of diesel filter initiative regeneration controlling method and system, oxygen content in can Real-Time Monitoring exhaust, when DPF initiative regeneration, fresh air is introduced in exhaust, increase the oxygen content in exhaust, and according to the size of oxygen content, regeneration fuel injection quantity is adjusted in real time, impel carbon granule in regenerative process to burn fully, improve regeneration efficiency, reduce regeneration discharge.
The invention provides a kind of diesel filter initiative regeneration controlling method, comprising:
From engine air compressor or gas cylinder, getting gas is transported in outlet pipe;
Oxygen content in monitoring exhaust is controlled according to the actual requirements the size that is transported to the tolerance in outlet pipe in dpf regeneration process.
Preferably, also comprise:
In dpf regeneration process, according to the size of the oxygen content in the exhaust monitoring, regeneration fuel injection quantity is adjusted.
Preferably, adopt lambda sensor to detect the oxygen content in exhaust.
Preferably, by valve opening size, control the size that is transported to the tolerance in outlet pipe.
The present invention also provides a kind of diesel filter initiative regeneration control system, comprising:
Lambda sensor, bleed pipeline, valve and control unit;
Described lambda sensor, in gas exhaust piping front end, for the oxygen content of Real-Time Monitoring exhaust, and will be sent to ECU (Electrical Control Unit) with regard to testing result;
Described bleed pipeline is to draw a road pipeline from engine air compressor or gas cylinder, on the gas exhaust piping before described lambda sensor;
Described valve is in described bleed pipeline, for controlling according to the instruction of described ECU (Electrical Control Unit) from the size of air compressor or the tolerance of drawing from gas cylinder.
Preferably, described control unit, also adjusts regeneration fuel injection quantity for the size of the oxygen content that monitors according to described lambda sensor.
Preferably, described control unit, for adjusting regeneration fuel injection quantity according to the size of oxygen content, specifically: increase or reduce according to the size of oxygen content the fuel injection quantity of regenerating, guarantee that in regenerative process, carbon granule can effectively fully burn.
Preferably, described control unit, for controlling the size of HC nozzle adjustment regeneration fuel injection quantity.
As can be seen from the above-described embodiment, a kind of diesel filter initiative regeneration controlling method provided by the invention and system, the method specifically: from engine air compressor or gas cylinder, get gas and be transported in outlet pipe; Oxygen content in monitoring exhaust is controlled according to the actual requirements the size that is transported to the tolerance in outlet pipe in dpf regeneration process.This system is specifically: it is characterized in that, comprising: lambda sensor, bleed pipeline, valve and control unit; Described lambda sensor, in gas exhaust piping front end, for the oxygen content of Real-Time Monitoring exhaust, and will be sent to ECU (Electrical Control Unit) with regard to testing result; Described bleed pipeline is to draw a road pipeline from engine air compressor or gas cylinder, on the gas exhaust piping before described lambda sensor; Described valve is in described bleed pipeline, for controlling according to the instruction of described ECU (Electrical Control Unit) from the size of air compressor or the tolerance of drawing from gas cylinder.By the size of the oxygen content in monitoring exhaust, when DPF initiative regeneration, fresh air is introduced in exhaust, increase the oxygen content in exhaust, impel carbon granule in regenerative process to burn fully, improve regeneration efficiency, reduce regeneration discharge.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the method flow diagram of a kind of diesel filter initiative regeneration controlling method of the embodiment of the present invention one announcement;
Fig. 2 is the method flow diagram of the another kind of diesel filter initiative regeneration controlling method of the embodiment of the present invention one announcement;
Fig. 3 is the structural representation of a kind of diesel filter initiative regeneration control system of the embodiment of the present invention two announcements;
Fig. 4 is the structural representation of a kind of diesel filter initiative regeneration control system of the embodiment of the present invention three announcements.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail.
The regeneration that it should be noted that filter has two types of initiative regeneration and passive regeneration, and so-called initiative regeneration is to utilize outside energy to improve the temperature in catcher, makes particulate ignition.When the temperature in filter reaches 300 ℃, the particulate matter of deposition will oxidizing fire, if temperature does not reach 300 ℃, too much sediments will blocking filter, at this moment just need to utilize external energy (electric heater for example, the change of burner or engine operating condition) improve the temperature in DPF, make finely ground particles carry out oxidizing fire.So-called passive regeneration is to utilize fuel oil additive or catalyzer to reduce the kindling temperature of particulate, make particulate can be at normal diesel exhaust gas temperature ignition.Additive (such as cerium, iron, strontium) will be added in fuel oil in certain proportion, and additive too much impact is little, if but very few, will cause regeneration delays or regeneration temperature to raise.Because initiative regeneration can manual control, favorable regeneration effect, so DPF initiative regeneration is used widely.
Particulate matter trap system basic functional principle is: when diesel exhaust gas flows through oxidation catalyst (DOC), under 200-600 ℃ of temperature conditions, carbon monoxide and hydrocarbon are first almost all oxidized to carbon dioxide and water, and nitrous oxide is converted to nitrogen dioxide simultaneously.Exhaust is from DOC out enters grain catcher (DPF), and wherein particulate is trapped in the filter core of filter, and remaining more clean exhaust enters in atmosphere.
Embodiment one
Refer to Fig. 1, it is the method flow diagram of a kind of diesel filter initiative regeneration controlling method of the embodiment of the present invention one announcement, specifically comprises the following steps:
Step 101: get gas and be transported in outlet pipe from engine air compressor or gas cylinder;
Step 102: the oxygen content in monitoring exhaust, in dpf regeneration process, control according to the actual requirements the size that is transported to the tolerance in outlet pipe.
The filtration system usually adopting at present comprises DOC, DPF and dpf regeneration control system.Motor exhaust enters in DOC-DPF system from outlet pipe, carbon granule in tail gas is captured down in DPF, when acquiring a certain degree, the carbon of the inner trapping of DPF just need to carry out initiative regeneration, initiative regeneration method is: initiative regeneration controller is controlled HC injection unit according to Strategy for Regeneration Control and spray into diesel oil in outlet pipe, diesel oil is warmed up to the temperature of carbon-smoke combustion after DOC oxidation, thereby carbon granule reaches the object of removing soot in DPF internal combustion.
DPF(Diesel Particulate Filter) technology: diesel particulate trapping technique, the technology of particle (PM) in a kind of elimination diesel exhaust gas.
DPF active regeneration techniques: utilize outside energy to improve the temperature in catcher, make particulate ignition, thereby eliminate the carbon distribution of DPF inside.
DOC(Diesel Oxidation Catalysis) technology: be noble metal-coating catalyzer on honeycomb ceramic carrier (as platinum Pt etc.), its objective is in order to reduce HC, CO in diesel engine vent gas and the chemical reaction activation energy of SOF, make the oxygen in these substances and tail gas at lower temperature, carry out oxidation reaction and finally be converted into CO2 and H2O.
HC sprays: be in the outlet pipe before DOC, to spray into diesel oil when DPF initiative regeneration.
Preferably, in said method, adopt lambda sensor to detect the oxygen content in exhaust.
Due to, oxygen content is not enough in actual applications, causes the diesel oil that HC ejects all to burn, and causes the temperature after DOC to reach the temperature that carbon granule burns by prestissimo, has a strong impact on regeneration efficiency and regeneration effect.
Therefore, preferred, said method also comprises:
In dpf regeneration process, according to the size of the oxygen content in the exhaust monitoring, fuel injection quantity is adjusted.Shown in the method flow diagram of concrete another kind of diesel filter initiative regeneration controlling method as shown in Figure 2.
By above-described embodiment one, can find out, a kind of diesel filter initiative regeneration controlling method provided by the invention, is transported in outlet pipe by get gas from engine air compressor or gas cylinder; Oxygen content in monitoring exhaust is controlled according to the actual requirements the size that is transported to the tolerance in outlet pipe in dpf regeneration process.By the size of the oxygen content in monitoring exhaust, when DPF initiative regeneration, fresh air is introduced in exhaust, increase the oxygen content in exhaust, impel carbon granule in regenerative process to burn fully, improve regeneration efficiency, reduce regeneration discharge.
In addition, by fuel injection quantity being adjusted according to the size of the oxygen content in the exhaust monitoring in dpf regeneration process; Further energy saving, improves regeneration efficiency and reduces regeneration discharge.
Embodiment two
A kind of diesel filter initiative regeneration control system that the present invention also provides, specifically refers to Fig. 3, and it is the structural representation of a kind of diesel filter initiative regeneration control system of the embodiment of the present invention two announcements, and this system comprises:
Lambda sensor, bleed pipeline, valve and control unit;
Described lambda sensor, in gas exhaust piping front end, for the oxygen content of Real-Time Monitoring exhaust, and will be sent to ECU (Electrical Control Unit) with regard to testing result;
Described bleed pipeline is to draw a road pipeline from engine air compressor or gas cylinder, on the gas exhaust piping before described lambda sensor;
Described valve is in described bleed pipeline, for controlling according to the instruction of described ECU (Electrical Control Unit) from the size of air compressor or the tolerance of drawing from gas cylinder.
In order more specifically this control system to be explained, the concrete application scenarios of take below carries out detailed explaining to this system as example, specifically refer to Fig. 4, it is the structural representation of a kind of diesel filter initiative regeneration control system of the embodiment of the present invention four announcements, for a normal diesel engine, filter initiative regeneration system generally comprises the following part described in Fig. 4: 1. motor 3.HC nozzle 6. air compressors or gas cylinder 7. fuel tank 8. fuel delivery unit 9. fuel gauging unit 10. exhaust temperature sensor T111. exhaust temperature sensor T212.DPF differential pressure pickup 13. exhaust temperature sensor T314. control unit 15. control unit of engine 16.DOC17.DPF18. outlet pipes.In the present embodiment, this system mainly comprises: lambda sensor 2, bleed pipeline 4, valve 5 and control unit 14;
Described lambda sensor 2, in gas exhaust piping 18 front ends, for the oxygen content of Real-Time Monitoring exhaust, and will be sent to ECU (Electrical Control Unit) with regard to testing result;
Described bleed pipeline 4 is to draw Yi road pipeline from engine air compressor or gas cylinder, on the gas exhaust piping before described lambda sensor 2;
Described valve 5 is in described bleed pipeline, for controlling according to the instruction of described ECU (Electrical Control Unit) 14 from the size of air compressor or the tolerance of drawing from gas cylinder.
Preferably, described control unit, also adjusts regeneration fuel injection quantity for the size of the oxygen content that monitors according to described lambda sensor.
Preferably, described control unit, for adjusting regeneration fuel injection quantity according to the size of oxygen content, specifically: increase or reduce according to the size of oxygen content the fuel injection quantity of regenerating, guarantee that in regenerative process, carbon granule can effectively fully burn.
Preferably, described control unit, for controlling the size of HC nozzle adjustment regeneration fuel injection quantity.
Lambda sensor 2 in above-mentioned diesel filter initiative regeneration control system, is used for measuring in real time the oxygen content in exhaust; From air compressor or gas cylinder 6, draw a road pipeline 4 to the gas exhaust piping lambda sensor 2, in bleed pipeline 4, mounted valve 5 is for controlling the size of the tolerance of drawing from air compressor, and valve 5 is controlled by control unit 14, can electric controlled regulating valve door 5 apertures sizes.This control system by drawing a certain amount of air, the oxygen content while having increased dpf regeneration in exhaust from air compressor or gas cylinder 6; Lambda sensor 2 is measured the oxygen content in exhaust in real time, and oxygen concentration signal sends control unit 14 to.During DPF initiative regeneration, because the oxygen concentration in outlet pipe is lower, during oil spout regeneration, temperature after DOC reaches the temperature of carbon granule burning, carbon granule is in DPF internal-combustion, but because oxygen content in exhaust is very low, carbon granule does not have enough oxygen supports, often cause regeneration effect not good, and cause regeneration discharge if CO, PM discharge value are higher than normal 1～2 order of magnitude of discharge value.Therefore when dpf regeneration, by control unit 14 regulating valve 5 apertures, hyperoxic fresh air, in bleed pipeline 4 is incorporated into outlet pipe 18, is improved to the oxygen content in exhaust while regenerating.By lambda sensor 2, measure in real time the oxygen content in exhaust, control unit 14 is adjusted the fuel injection quantity spraying in outlet pipe 18 according to the size of oxygen concentration, guaranteeing under the prerequisite of dpf regeneration effect, while making to regenerate, carbon granule can burn effectively fully, has accelerated CO, PM discharge amount when carbon consumption speed reduces regeneration simultaneously.
By above-described embodiment four, can find out, a kind of diesel filter initiative regeneration control system provided by the invention, profit lambda sensor, bleed pipeline, valve and control unit, described lambda sensor is in gas exhaust piping front end, for the oxygen content of Real-Time Monitoring exhaust, and will be sent to ECU (Electrical Control Unit) with regard to testing result; Described bleed pipeline is to draw a road pipeline from engine air compressor or gas cylinder, on the gas exhaust piping before described lambda sensor; Described valve is in described bleed pipeline, for controlling according to the instruction of described ECU (Electrical Control Unit) from the size of air compressor or the tolerance of drawing from gas cylinder.Visible this system, utilizes bleed pipeline from engine air compressor or gas cylinder, to get gas and is transported in outlet pipe; Utilize the oxygen content in lambda sensor monitoring exhaust, when DPF initiative regeneration, fresh air is introduced in exhaust, increase the oxygen content in exhaust, impel carbon granule in regenerative process to burn fully, improve regeneration efficiency, reduce regeneration discharge.
In addition, by control unit, in dpf regeneration process, according to the size of the oxygen content in the exhaust monitoring, fuel injection quantity is adjusted; Further energy saving, improves regeneration efficiency and reduces regeneration discharge.
It should be noted that, one of ordinary skill in the art will appreciate that all or part of flow process realizing in above-described embodiment method, to come the hardware that instruction is relevant to complete by computer program, described program can be stored in computer read/write memory medium, this program, when carrying out, can comprise as the embodiment's of above-mentioned each side method flow process.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
Above a kind of diesel filter initiative regeneration controlling method provided by the present invention and system are described in detail, applied specific embodiment herein principle of the present invention and mode of execution are set forth, above embodiment's explanation is just for helping to understand method of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention meanwhile.
Claims (8)
1. a diesel filter initiative regeneration controlling method, is characterized in that, comprising:
From engine air compressor or gas cylinder, getting gas is transported in outlet pipe;
Oxygen content in monitoring exhaust is controlled according to the actual requirements the size that is transported to the tolerance in outlet pipe in dpf regeneration process.
2. method according to claim 1, is characterized in that, also comprises:
In dpf regeneration process, according to the size of the oxygen content in the exhaust monitoring, regeneration fuel injection quantity is adjusted.
3. method according to claim 1, is characterized in that, adopts lambda sensor to detect the oxygen content in exhaust.
4. method according to claim 1, is characterized in that, by valve opening size, controls the size that is transported to the tolerance in outlet pipe.
5. a diesel filter initiative regeneration control system, is characterized in that, comprising:
Lambda sensor, bleed pipeline, valve and control unit;
Described lambda sensor, in gas exhaust piping front end, for the oxygen content of Real-Time Monitoring exhaust, and will be sent to ECU (Electrical Control Unit) with regard to testing result;
Described bleed pipeline is to draw a road pipeline from engine air compressor or gas cylinder, on the gas exhaust piping before described lambda sensor;
Described valve is in described bleed pipeline, for controlling according to the instruction of described ECU (Electrical Control Unit) from the size of air compressor or the tolerance of drawing from gas cylinder.
6. system according to claim 5, is characterized in that, described control unit is also adjusted regeneration fuel injection quantity for the size of the oxygen content that monitors according to described lambda sensor.
7. system according to claim 5, it is characterized in that, described control unit, for adjusting regeneration fuel injection quantity according to the size of oxygen content, specifically: according to the size of oxygen content, increase or reduce the fuel injection quantity of regenerating, guarantee that in regenerative process, carbon granule can effectively fully burn.
8. system according to claim 5, is characterized in that, described control unit, for controlling the size of HC nozzle adjustment regeneration fuel injection quantity.
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Cited By (6)
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| CN107100748A (en) * | 2015-10-16 | 2017-08-29 | 温特图尔汽柴油公司 | Operate the method and low speed operation large-scale diesel engine of low speed operation large-scale diesel engine |
| CN108087071A (en) * | 2017-12-05 | 2018-05-29 | 南京依柯卡特排放技术股份有限公司 | To the determination methods of DPF carbon carrying capacity |
| CN108386260A (en) * | 2017-02-03 | 2018-08-10 | 罗伯特·博世有限公司 | Method for heating and regenerating the particulate filter in the exhaust gas of gasoline engine |
| CN109083720A (en) * | 2018-07-26 | 2018-12-25 | 东风商用车有限公司 | A kind of diesel vehicle DPF initiative regeneration temprature control method |
| CN109695520A (en) * | 2018-12-25 | 2019-04-30 | 武汉理工大学 | A kind of nanometer additive fuel oil supply system of marine diesel |
| CN112627995A (en) * | 2019-09-24 | 2021-04-09 | 上海汽车集团股份有限公司 | Supercharged gasoline engine and adjusting pipeline and adjusting method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107100748A (en) * | 2015-10-16 | 2017-08-29 | 温特图尔汽柴油公司 | Operate the method and low speed operation large-scale diesel engine of low speed operation large-scale diesel engine |
| CN108386260A (en) * | 2017-02-03 | 2018-08-10 | 罗伯特·博世有限公司 | Method for heating and regenerating the particulate filter in the exhaust gas of gasoline engine |
| CN108386260B (en) * | 2017-02-03 | 2021-12-03 | 罗伯特·博世有限公司 | Method for heating and regenerating a particle filter in the exhaust gas of a gasoline engine |
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| CN108087071B (en) * | 2017-12-05 | 2021-09-28 | 南京依柯卡特排放技术股份有限公司 | Method for judging carbon loading of DPF |
| CN109083720A (en) * | 2018-07-26 | 2018-12-25 | 东风商用车有限公司 | A kind of diesel vehicle DPF initiative regeneration temprature control method |
| CN109083720B (en) * | 2018-07-26 | 2020-01-07 | 东风商用车有限公司 | Diesel vehicle DPF active regeneration temperature control method |
| CN109695520A (en) * | 2018-12-25 | 2019-04-30 | 武汉理工大学 | A kind of nanometer additive fuel oil supply system of marine diesel |
| CN112627995A (en) * | 2019-09-24 | 2021-04-09 | 上海汽车集团股份有限公司 | Supercharged gasoline engine and adjusting pipeline and adjusting method thereof |
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Application publication date: 20140115 |