CN113339114A - Regeneration protection system and vehicle - Google Patents
Regeneration protection system and vehicle Download PDFInfo
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- CN113339114A CN113339114A CN202110728244.1A CN202110728244A CN113339114A CN 113339114 A CN113339114 A CN 113339114A CN 202110728244 A CN202110728244 A CN 202110728244A CN 113339114 A CN113339114 A CN 113339114A
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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
- 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
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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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
- F01N3/021—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
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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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
- F01N3/106—Auxiliary oxidation catalysts
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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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/06—Adding substances to exhaust gases the substance being in the gaseous form
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Materials Engineering (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to a regenerative protection system and a vehicle. The regeneration protection system includes: an engine; an exhaust line having one end communicating with the engine; the diesel particle collector is arranged on the exhaust pipeline and is communicated with the exhaust pipeline; the oxidation catalyst is arranged on an exhaust pipeline between the engine and the diesel particle collector and is communicated with the exhaust pipeline; an ammonia gas supply unit which is communicated with an exhaust pipeline between the engine and the oxidation catalyst; and the electronic control unit is in communication connection with the ammonia gas supply unit and is used for controlling the ammonia gas supply unit to supply ammonia gas to the exhaust pipeline. The regeneration protection system controls the ammonia gas supply unit to spray ammonia gas into the oxidation catalyst, consumes oxygen and nitrogen dioxide required by the regeneration reaction in the waste gas, and reduces or even stops the oxidation reaction of carbon particles from the perspective of a regeneration mechanism. Therefore, the cooling speed of the diesel particle collector is accelerated, and the ablation damage of the diesel particle collector is effectively prevented.
Description
Technical Field
The invention relates to the technical field of regeneration protection of diesel particle collectors, in particular to a regeneration protection system and a vehicle.
Background
In order to meet the increasingly strict requirements of diesel vehicle emission regulations, a Diesel Particulate Filter (DPF) becomes one of the necessary technical solutions for controlling the particulate emission of diesel engines.
The function of the diesel particulate trap is to collect particulate matter in the exhaust, the amount of particulate matter is accumulated continuously along with the operation of the engine, and when the amount of particulate matter is accumulated to a certain degree, the regeneration function of the diesel particulate trap is triggered. The regeneration function of the diesel particulate filter is realized by the temperature rise linkage of the diesel particulate filter and an oxidation catalyst (DOC), so that carbon particles in the diesel particulate filter are subjected to oxidation reaction with oxygen and nitrogen dioxide to generate carbon dioxide, and the regeneration of the diesel particulate filter is completed. When the regeneration of the diesel particulate filter is stopped or the regeneration is over-temperature, the diesel particulate filter needs to be rapidly cooled.
However, the conventional cooling method cannot cool the diesel particulate filter in time, and the diesel particulate filter is easy to damage.
Disclosure of Invention
In view of the above, it is necessary to provide a regeneration protection system and a vehicle for solving the problem that the conventional cooling method cannot cool the diesel particulate filter in time, so as to damage the diesel particulate filter.
According to an aspect of the present application, there is provided a regenerative protection system, comprising:
an engine;
an exhaust line having one end communicating with the engine;
the diesel particle collector is arranged on the exhaust pipeline and is communicated with the exhaust pipeline;
the oxidation catalyst is arranged on the exhaust pipeline between the engine and the diesel particle collector and is communicated with the exhaust pipeline;
an ammonia gas supply unit that communicates with the exhaust line between the engine and the oxidation catalyst; and
and the electronic control unit is in communication connection with the ammonia gas supply unit and is used for controlling the ammonia gas supply unit to supply ammonia gas to the exhaust pipeline.
In one embodiment, the ammonia gas supply unit includes:
the ammonia gas storage device is used for storing ammonia gas;
the two opposite ends of the ammonia gas pipeline are respectively communicated with the ammonia gas storage device and the exhaust pipeline;
the ammonia gas injection device is arranged on the ammonia gas pipeline and communicated with the ammonia gas pipeline; the electronic control unit is connected with the ammonia gas injection device in a communication mode so as to control the amount of ammonia gas injected into the exhaust pipeline by the ammonia gas injection device.
In one embodiment, the ammonia gas supply unit further comprises an ammonia gas pressure stabilizer, and the ammonia gas pressure stabilizer is arranged on the ammonia gas pipeline between the ammonia gas storage device and the ammonia gas injection device and is communicated with the ammonia gas pipeline.
In one embodiment, the ammonia gas supply unit further comprises an ammonia detection device, which is arranged near the ammonia gas storage device and is used for detecting the ammonia gas storage amount in the ammonia gas storage device.
In one embodiment, the device further comprises a temperature detection device which is in communication connection with the electronic control unit, is arranged close to the diesel particle collector and is used for detecting the exhaust temperature of the diesel particle collector, and the electronic control unit starts or stops the ammonia gas supply unit according to the exhaust temperature.
In one embodiment, the system further comprises an oxygen detection device which is in communication connection with the electronic control unit, is arranged close to the exhaust pipeline between the engine and the oxidation catalyst and is used for detecting the oxygen content in the exhaust gas discharged by the engine, and the electronic control unit is used for controlling the amount of ammonia provided by the ammonia supply unit to the exhaust pipeline according to the oxygen content.
In one embodiment, the ammonia gas purification device further comprises a nitrogen and oxygen detection device which is in communication connection with the electronic control unit, is arranged close to the exhaust pipeline between the engine and the oxidation catalyst and is used for detecting the content of nitrogen oxides in exhaust gas discharged by the engine, and the electronic control unit controls the amount of ammonia gas provided by the ammonia gas supply unit into the exhaust pipeline according to the content of the nitrogen oxides.
In one embodiment, the oxidation catalyst further comprises a catalyst arranged in the oxidation catalyst, and the catalyst is a composition of platinum, rhodium and palladium.
In one embodiment, the system further comprises a selective catalytic reduction device, and the selective catalytic reduction device is communicated with the other end, far away from the engine, of the exhaust pipeline.
As a similar idea of the present application, there is also provided a vehicle characterized by including the above-described regenerative protection system.
According to the regeneration protection system, when the regeneration of the diesel particle collector is stopped or the regeneration is over-temperature, the electronic control unit executes the regeneration interruption operation, and simultaneously, the rotating speed of the engine is increased so as to improve the exhaust flow rate and reduce and take away the heat of the regeneration reaction of the diesel particle collector. In addition, the electronic control unit controls the ammonia gas supply unit to inject ammonia gas into the oxidation catalyst so as to consume oxygen and nitrogen dioxide required by the regeneration reaction in the exhaust gas, and the oxidation reaction speed of carbon particles in the diesel particle collector is reduced from the viewpoint of the regeneration mechanism. Therefore, the cooling speed of the diesel particle collector is accelerated, and the ablation damage of the diesel particle collector is effectively prevented.
Drawings
Fig. 1 is a schematic structural diagram of a regenerative protection system according to an embodiment of the present application.
100. A regenerative protection system; 10. a diesel particulate collector; 20. an engine; 30. an oxidation catalyst; 40. an ammonia gas supply unit; 41. an ammonia gas storage device; 42. an ammonia gas injection device; 43. an ammonia gas pressure stabilizer; 44. an ammonia gas pipeline; 50. an electronic control unit; 61. a temperature detection device; 62. an oxygen detection device; 63. a nitrogen-oxygen detection device; 70. a selective catalytic reduction device; 80. an exhaust line.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
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, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
In order to facilitate understanding of the technical solution of the present application, prior to the detailed description, a technology of a conventional regenerative protection system will be described first.
When the diesel particle collector is regenerated, the electronic control unit carries out temperature management on the post-treatment system, the temperature of the oxidation catalyst is raised to 270 ℃, the electronic control unit controls the oil injector to inject fuel oil, carbon monoxide and nitrogen oxide in the fuel oil and waste gas are subjected to oxidation catalytic reaction in the oxidation catalyst to generate carbon dioxide and nitrogen dioxide, when the temperature of the diesel particle collector reaches 500-600 ℃, carbon particles in the diesel particle collector can be subjected to oxidation reaction with oxygen and nitrogen dioxide to generate carbon dioxide, and regeneration of the diesel particle collector is completed.
At present, the research on the regeneration ablation prevention of the diesel particle collector mainly aims at controlling the regeneration temperature, when the regeneration is stopped or the regeneration is over-temperature, the diesel particle collector is rapidly cooled by a method of interrupting the regeneration and increasing the exhaust flow rate, but because the cooling of the diesel particle collector needs a certain time and the oxidizing agent (oxygen and nitrogen dioxide) exists in the exhaust gas, the oxidation reaction can be continued for a period of time, and particularly when the engine fails and the rotating speed cannot be increased, the diesel particle collector cannot be cooled in time, so that the diesel particle collector is ablated and damaged.
Accordingly, the present application provides a regenerative protection system and a vehicle, which can preferably improve the above-mentioned problems.
The regenerative protection system and the vehicle according to the present application will be described with reference to the drawings.
Fig. 1 is a schematic structural diagram of a regenerative protection system according to an embodiment of the present application. For the purpose of illustration, only the structures described in connection with the present application are illustrated in the drawings.
At least one embodiment of the present application discloses a regeneration protection system 100 comprising an engine 20, a diesel particulate trap 10, an oxidation catalyst 30, an ammonia gas supply unit 40, an electronic control unit 50, and an exhaust line 80. The engine 20, the diesel particulate filter 10, the oxidation catalyst 30 and the ammonia gas supply unit 40 are all in communication with the exhaust line 80, the electronic control unit 50 is in communication with the ammonia gas supply unit 40, and the electronic control unit 50 is configured to control the ammonia gas supply unit 40 to supply ammonia gas to the exhaust line 80.
In some embodiments, the engine 20 communicates with one end of an exhaust line 80, the diesel particulate filter 10 is provided on the exhaust line 80 and communicates with the exhaust line 80, the oxidation catalyst 30 is provided on the exhaust line 80 between the engine 20 and the diesel particulate filter 10 and communicates with the exhaust line 80, and the ammonia gas supply unit 40 communicates with the exhaust line 80 between the engine 20 and the oxidation catalyst 30.
In practical applications, when the diesel particulate filter 10 is regenerated, and abnormal conditions such as regeneration suspension and regeneration over-temperature are caused by various factors, the first operation is to suspend the regeneration reaction of the diesel particulate filter 10, so as to stop the reaction heat of the diesel particulate filter 10, and increase the rotation speed of the engine 20, so as to increase the flow rate of the exhaust gas in the exhaust pipe 80, and to take away the reaction heat of the diesel particulate filter 10 through the gas flow.
At the same time, the electronic control unit 50 also controls the ammonia gas supply unit 40 to supply ammonia gas to the exhaust line 80 to consume the regenerated oxidant of the diesel particulate filter 10. Specifically, the oxidants oxygen and nitrogen dioxide regenerated by the diesel particulate filter 10 can react with ammonia gas in the oxidation catalyst 30 to generate nitrogen gas and water. Further, the rate of oxidation of carbon particles in the diesel particulate trap 10 may be reduced or even discontinued due to the reduction in the oxidant during regeneration. Thus, the cooling speed of the diesel particulate collector 10 can be increased, and the diesel particulate collector 10 can be prevented from being ablated and damaged due to the fact that the rotating speed of the engine 20 cannot be increased in the cooling process.
In some embodiments, the regeneration protection system 100 further includes a catalyst disposed within the oxidation catalyst 30 for catalyzing the ammonia gas to react with the oxygen and nitrogen oxides in the exhaust gas to accelerate the consumption of the oxygen and nitrogen oxides. Thus, the oxidation reaction speed of the carbon particles in the diesel particle collector 10 can be effectively reduced, and the problem of failure of the regeneration protection of the diesel particle collector 10 is avoided. In particular, in some embodiments, the catalyst may be a noble metal, and in particular, the catalyst may be a combination of platinum, rhodium, and palladium. It is to be understood that the above description is intended to be illustrative, and not restrictive.
In some embodiments, the ammonia gas supply unit 40 includes an ammonia gas storage device 41 and an ammonia gas line 44, and opposite ends of the ammonia gas line 44 are respectively communicated with the ammonia gas storage device 41 and the exhaust gas line 80. In practical applications, the ammonia gas storage device 41 is used for storing ammonia gas, and the ammonia gas pipeline 44 is used for guiding the ammonia gas stored in the ammonia gas storage device 41 to the exhaust pipeline 80.
In particular, in some embodiments, the ammonia storage device 41 includes an ammonia storage tank for storing ammonia, and the ammonia storage tank is easy to disassemble and assemble and convenient to replace. Specifically, when the ammonia storage amount of the ammonia storage tank in use is insufficient, the diesel particulate collector 10 can be prevented from being disabled in regeneration protection by replacing a new ammonia storage tank and supplementing ammonia in time.
Further, the ammonia gas supply unit 40 further includes ammonia detection means provided near the ammonia gas storage device 41 for detecting the amount of ammonia gas stored in the ammonia gas storage device 41. Specifically, in some embodiments, the ammonia gas supply unit 40 further includes a reminding device, which is connected to the ammonia detection device in a communication manner, and when the ammonia detection device detects that the amount of ammonia gas stored in the ammonia gas storage device 41 is insufficient, the reminding device can remind an operator to replace the ammonia gas storage device 41 in time. Specifically, the reminding device may be a display or an alarm, and the application is not limited in this respect.
Further, the ammonia gas supply unit 40 further includes an ammonia gas injection device 42, and the ammonia gas injection device 42 is disposed along the ammonia gas line 44 and is communicated with the ammonia gas line 44. The electronic control unit 50 is communicatively connected to the ammonia gas injection device 42 to control the amount of ammonia gas injected from the ammonia gas injection device 42 into the exhaust line 80.
Further, the ammonia gas supply unit 40 further includes an ammonia gas pressure stabilizer 43, and the ammonia gas pressure stabilizer 43 is provided on the ammonia gas line 44 between the ammonia gas storage device 41 and the ammonia gas injection device 42, and is communicated with the ammonia gas line 44. In practical applications, the ammonia gas pressure stabilizer 43 is used to control the ammonia gas injection pressure to be stabilized at a target value. Specifically, when supplying ammonia gas into the exhaust line 80, the electronic control unit 50 can determine and calculate the supply amount of ammonia gas by controlling the injection period of the ammonia gas injection device 42. Therefore, the supply amount of ammonia gas can be accurately controlled, and the problem of failure of regeneration protection of the diesel particle collector 10 is effectively avoided.
In some embodiments, the regeneration protection system 100 further comprises a temperature sensing device 61 communicatively coupled to the electronic control unit 50, the temperature sensing device 61 being disposed proximate to the diesel particulate trap 10 for sensing the temperature of the exhaust of the diesel particulate trap 10. In particular, in some embodiments, the temperature detection device 61 may be a temperature sensor, which has a simple structure and high detection accuracy.
Further, the temperature detection device 61 can transmit the exhaust temperature to the electronic control unit 50, and the electronic control unit 50 determines to turn on or off the ammonia gas supply unit 40 according to the exhaust temperature. In particular, in some embodiments, the electronic control unit 50 comprises a memory having a temperature threshold stored therein, and a comparator capable of comparing the temperature threshold with the exhaust temperature transmitted by the temperature detection device 61, wherein the exhaust temperature may be a series of exhaust temperature values. If the detected exhaust temperature value is higher than the temperature threshold value, a start instruction is sent to the ammonia gas supply unit 40, and the ammonia gas supply unit 40 supplies ammonia gas to the exhaust duct 80. Otherwise, the ammonia gas supply unit 40 is closed, and the supply of ammonia gas to the exhaust line 80 is stopped.
As a preferred embodiment of the present application, the temperature detecting means 61 is provided at the exhaust port of the end of the diesel particulate filter 10 remote from the oxidation catalyst 30 to improve the accuracy of the temperature detection of the diesel particulate filter 10 by the temperature detecting means 61. Therefore, the ammonia gas supply unit 40 can be started timely, and ablation damage of the diesel particle collector 10 due to untimely cooling can be effectively avoided.
In some embodiments, the regeneration protection system 100 further includes an oxygen sensing device 62 communicatively coupled to the electronic control unit 50, the oxygen sensing device 62 being disposed proximate the exhaust conduit 80 between the engine 20 and the oxidation catalyst 30 for sensing an oxygen content of the exhaust gas emitted by the engine 20. In particular, in some embodiments, the oxygen detecting device 62 may be an oxygen sensor, which has a simple structure and high detection accuracy.
Further, the oxygen detecting device 62 can transmit the oxygen content to the electronic control unit 50, and the electronic control unit 50 controls the amount of ammonia provided by the ammonia gas supply unit 40 to the exhaust line 80 according to the oxygen content. In practical applications, the electronic control unit 50 can calculate the amount of ammonia required for oxygen consumption according to the oxygen content detected by the oxygen detection device 62, and then control the injection duration of the ammonia gas injection device 42 to provide the amount of ammonia required for the reaction. Therefore, the supply amount of the ammonia gas can be accurately controlled, and the problem of regeneration protection failure of the diesel particle collector 10 is effectively avoided.
In some embodiments, the regeneration protection system 100 further includes a nitrogen and oxygen detection device 63 communicatively coupled to the electronic control unit 50, the nitrogen and oxygen detection device 63 being disposed proximate the exhaust conduit 80 between the engine 20 and the oxidation catalyst 30 for detecting a nitrogen oxide content of the exhaust gas emitted by the engine 20. In particular, in some embodiments, the nitrogen oxide detection device 63 may be a nitrogen oxide sensor with high sensitivity to nitrogen oxides.
Further, the nitrogen-oxygen detecting device 63 can transmit the nitrogen oxide content to the electronic control unit 50, and the electronic control unit 50 determines the amount of ammonia provided by the ammonia gas supply unit 40 to the exhaust line 80 according to the nitrogen oxide content. In practical application, the electronic control unit 50 can calculate the amount of ammonia required for consuming nitrogen oxides according to the nitrogen-oxygen content detected by the nitrogen-oxygen detecting device 63, and then control the injection duration of the ammonia gas injection device 42 to provide the amount of ammonia required for reaction. Therefore, the supply amount of the ammonia gas can be accurately controlled, and the problem of regeneration protection failure of the diesel particle collector 10 is effectively avoided.
In some embodiments, the regeneration protection system 100 further includes a selective catalytic reduction device 70, the selective catalytic reduction device 70 being in communication with the end of the exhaust conduit 80 remote from the engine 20. In practical application, the selective catalytic reduction device 70 is used for reducing nitrogen oxides in the exhaust gas into nitrogen and water, so as to achieve the purposes of energy conservation and emission reduction.
As the same idea of the present application, there is also provided a method of regeneration protection of a diesel particulate trap 10, comprising in particular the steps of:
s210: the oxygen content and the nitrogen oxide content of the exhaust gases in the exhaust line 80 are detected.
S230: and calculating the amount of ammonia required for reaction with oxygen and nitrogen oxides.
S250: the amount of ammonia required for the reaction is provided to the exhaust line 80 to consume oxygen and nitrogen oxides in the exhaust.
S270: the temperature value of the diesel particulate trap 10 is detected, and whether to continue supplying ammonia gas into the exhaust line 80 is determined based on the temperature value.
As the same concept of the present application, there is also provided a vehicle including the above-described regenerative protection system 100. The diesel particulate trap 10 of the vehicle has a high cooling rate and little ablation.
In the regeneration protection system 100 and the vehicle, when the diesel particulate filter 10 is subjected to regeneration protection, ammonia gas is injected into the oxidation catalyst 30 based on the conventional means of interrupting the regeneration operation and increasing the rotation speed of the engine 20, so that oxygen and nitrogen dioxide required for the regeneration reaction in the exhaust gas are consumed, and the oxidation reaction of carbon particulates is reduced or even stopped from the viewpoint of the regeneration mechanism. Therefore, the cooling speed of the diesel particle collector 10 is accelerated, and the phenomenon of ablation damage of the diesel particle collector 10 is effectively avoided.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A regenerative protection system, comprising:
an engine;
an exhaust line having one end communicating with the engine;
the diesel particle collector is arranged on the exhaust pipeline and is communicated with the exhaust pipeline;
the oxidation catalyst is arranged on the exhaust pipeline between the engine and the diesel particle collector and is communicated with the exhaust pipeline;
an ammonia gas supply unit that communicates with the exhaust line between the engine and the oxidation catalyst; and
and the electronic control unit is in communication connection with the ammonia gas supply unit and is used for controlling the ammonia gas supply unit to supply ammonia gas to the exhaust pipeline.
2. The regenerative protection system according to claim 1, wherein the ammonia gas supply unit includes:
the ammonia gas storage device is used for storing ammonia gas;
the two opposite ends of the ammonia gas pipeline are respectively communicated with the ammonia gas storage device and the exhaust pipeline;
the ammonia gas injection device is arranged on the ammonia gas pipeline and communicated with the ammonia gas pipeline; the electronic control unit is connected with the ammonia gas injection device in a communication mode so as to control the amount of ammonia gas injected into the exhaust pipeline by the ammonia gas injection device.
3. The regeneration protection system according to claim 2, wherein the ammonia gas supply unit further comprises an ammonia gas pressure stabilizer that is provided on the ammonia gas line between the ammonia gas storage device and the ammonia gas injection device and communicates with the ammonia gas line.
4. The regeneration protection system according to claim 2 or 3, wherein the ammonia gas supply unit further comprises an ammonia detection device disposed near the ammonia gas storage device for detecting an amount of ammonia gas stored in the ammonia gas storage device.
5. The regeneration protection system of claim 1, further comprising a temperature sensing device communicatively coupled to the electronic control unit, the temperature sensing device being disposed proximate to the diesel particulate trap for sensing an exhaust temperature of the diesel particulate trap, the electronic control unit activating or deactivating the ammonia gas supply unit based on the exhaust temperature.
6. The regeneration protection system of claim 1, further comprising an oxygen detection device communicatively coupled to said electronic control unit, said oxygen detection device being disposed proximate said exhaust conduit between said engine and said oxidation catalyst for detecting an oxygen content of exhaust gases emitted from said engine, said electronic control unit being configured to control an amount of ammonia provided by said ammonia gas supply unit into said exhaust conduit based on said oxygen content.
7. The regeneration protection system according to claim 1 or 6, further comprising a nitrogen-oxygen detection device communicatively connected to the electronic control unit, the nitrogen-oxygen detection device being disposed near the exhaust line between the engine and the oxidation catalyst and configured to detect a nitrogen oxide content in exhaust gas discharged from the engine, the electronic control unit controlling an amount of ammonia supplied from the ammonia gas supply unit into the exhaust line according to the nitrogen oxide content.
8. The regeneration protection system of claim 1, further comprising a catalyst disposed within the oxidation catalyst, the catalyst being a combination of platinum, rhodium, and palladium.
9. The regeneration protection system of claim 1, further comprising a selective catalytic reduction device in communication with the other end of the exhaust conduit remote from the engine.
10. A vehicle, characterized in that it comprises a regenerative protection system according to any one of claims 1-9.
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| CN202110728244.1A CN113339114A (en) | 2021-06-29 | 2021-06-29 | Regeneration protection system and vehicle |
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| CN202110728244.1A CN113339114A (en) | 2021-06-29 | 2021-06-29 | Regeneration protection system and vehicle |
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