CN210948856U - Diesel engine aftertreatment system blocks up monitoring devices - Google Patents

Diesel engine aftertreatment system blocks up monitoring devices Download PDF

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Publication number
CN210948856U
CN210948856U CN201921226930.3U CN201921226930U CN210948856U CN 210948856 U CN210948856 U CN 210948856U CN 201921226930 U CN201921226930 U CN 201921226930U CN 210948856 U CN210948856 U CN 210948856U
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air cavity
sensing element
pressure sensing
pressure
diesel engine
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何传成
李明星
房居祥
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Guangxi Yuchai Machinery Co Ltd
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Guangxi Yuchai Machinery Co Ltd
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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
    • Y02T10/12—Improving ICE efficiencies
    • 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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Abstract

The utility model belongs to the technical field of diesel engine exhaust emission aftertreatment technology, especially, relate to a diesel engine aftertreatment system blocks up monitoring devices, include the oxidation type catalytic converter who feeds through the setting in proper order along the exhaust pipe of engine, the particle trap, the blender, the selective catalytic reduction system, urea injection system, differential pressure sensor's inner chamber is constructed into the first air cavity of arranging in proper order of being separated the formation by first pressure sensing element and second pressure sensing element, second air cavity and third air cavity, first air cavity and particle trap's entry intercommunication, exhaust pipe intercommunication between second air cavity and particle trap and the blender, the export intercommunication of third air cavity and blender. The utility model discloses a pressure sensor increases a pressure sensing element, can measure the pressure differential of particle catcher and the pressure differential of blender simultaneously, realizes diagnosing when blockking up the urea crystallization of particle catcher jam and blender.

Description

Diesel engine aftertreatment system blocks up monitoring devices
Technical Field
The utility model belongs to the technical field of diesel engine exhaust emission aftertreatment, especially, relate to a diesel engine aftertreatment system blocks up monitoring devices.
Background
The existing diesel engine post-treatment differential pressure sensor is mainly applied to measuring the tail gas pressure difference of front and rear channels of a tail gas particle catcher (DPF) of an automobile engine. DPF is Diesel Particulate Filter, i.e., Diesel Particulate trap. The diesel engine exhaust gas flow enters from a channel of a DPF bottom plugging hole, and only can flow to an adjacent channel of a front plugging hole from a channel wall surface micropore, particulate matters are filtered by the channel wall, the exhaust resistance and the pressure difference of the DPF can be gradually increased along with the accumulation of the particulate matters, and when the particulate matters are accumulated to a certain degree, the ECU can carry out active regeneration on the particulate trap. In the whole aftertreatment system, the particle catcher is used for realizing the particle regeneration function, and the pressure sensor is used for assisting in realizing the regeneration function, so that the particle catcher is an indispensable key component of the aftertreatment system, and the blockage is avoided.
A typical current state six stage emissions diesel engine aftertreatment arrangement is shown in fig. 1: DOC-DPF-mixer-SCR/ASC, differential pressure sensor 7 is arranged on both sides of the DPF. The measurement principle of the differential pressure sensor 7 is shown in fig. 2, 2 isolation air cavities in the sensor are connected with 2 high-low pressure airflows through air nozzles, and a differential pressure reaction is formed between the top and the bottom of the diaphragm. And outputting voltage according to the pressure-voltage characteristic curve through the adjustment and programming of a chip internal circuit.
For diesel engines discharged in the sixth phase of China, the diesel engines are subjected to the blockage faults of not only DPF particle capture but also urea crystallization of a mixer. The existing differential pressure sensor can only detect the risk of DPF blockage and can not detect the risk of urea crystallization blockage of the mixer. A diesel engine uncooled EGR emission treatment system as disclosed in chinese patent CN 108533360 a, comprising: a turbocharger; a non-cooled EGR system comprising: an EGR valve, an EGR mixer, and a controller; the gas inlet end of the oxidation type catalytic converter and the particle catcher are connected with the outlet of the oxidation type catalytic converter; the two ends of the particle catcher are connected with a differential pressure sensor; the system is connected with a differential pressure sensor only at two ends of the particle catcher. In addition, the mixer is a container for mixing urea and exhaust gas, a non-air-assisted urea injection system is used in the six-stage discharge in China, so that a very good atomization effect cannot be realized, the sprayed urea aqueous solution cannot be completely decomposed, crystals are generated, and the crystals are very easily generated in the mixer. Therefore urea crystallization in the mixer is inevitable in the sixth phase of the country. Meanwhile, the urea crystal blockage of the mixer can realize cleaning regeneration through high temperature of exhaust, and the key point of the regeneration is lack of reasonable diagnosis input.
SUMMERY OF THE UTILITY MODEL
The utility model provides a diesel engine aftertreatment system blocks up monitoring devices increases a pressure sensing element through differential pressure sensor, can simultaneous measurement particle trap's the pressure differential and the pressure differential of blender, realizes the simultaneous diagnosis to the urea crystallization jam of particle trap jam and blender.
The technical scheme of the utility model as follows: a diesel engine aftertreatment system blockage monitoring device comprises an oxidation type catalytic converter, a particle trap, a mixer and a selective catalytic reduction system which are sequentially communicated and arranged along an exhaust pipeline of an engine;
an oxidation type catalytic converter (DOC) is installed in the exhaust line of an engine to convert carbon monoxide and Hydrocarbons (HC) in the exhaust gas of the engine into harmless water (H) by oxidation reaction2O) and carbon dioxide (CO)2) The apparatus of (1).
A particulate trap, DPF for short, is a ceramic filter installed in the exhaust system of diesel engines that traps particulate emissions before they enter the atmosphere.
The selective catalytic reduction system is SCR for short, and aims at NO in tail gas exhaust of diesel vehiclexThe treatment technology of (1) is to inject reducing agent ammonia or urea under the action of catalyst to treat NO in tail gasxReduction to N2And H2O。
The mixer is used for mixing ammonia gas generated by thermal decomposition after urea aqueous solution is injected with nitrogen oxides in flue gas, the mixer is usually arranged in front of the SCR reactor to promote the mixing of the ammonia gas and the flue gas, and then the urea injection system is connected with the mixer.
The utility model discloses still include with the urea injection system of blender intercommunication still includes differential pressure sensor, differential pressure sensor's inner chamber is constructed into by first pressure sensing element and second pressure sensing element and separates the first air cavity, second air cavity and the third air cavity of arranging in proper order that forms, first air cavity with be located oxidation type catalytic converter with exhaust pipe intercommunication between the particle trap, the second air cavity with be located the particle trap with exhaust pipe intercommunication between the blender, the third air cavity with be located the blender with exhaust pipe intercommunication between the selective catalytic reduction system. After the first air cavity, the second air cavity and the third air cavity in the pressure difference sensor are communicated with the pipeline, a pressure difference reaction is formed between two sides of the first pressure sensing element and two sides of the second pressure sensing element, voltage is output according to a pressure-voltage characteristic curve through adjustment and programming of a chip circuit in the pressure sensor, and the monitoring device calculates the pressure difference through pressure signals and judges whether the pressure sensor is blocked or not. When the monitoring device detects that the particle catcher is blocked, the engine ECU carries out active regeneration on the particle catcher; when the monitoring device detects that the particulate trap or mixer is clogged, regeneration of the mixer is achieved by treating the crystals in the same way as the DPF active regeneration.
Differential pressure sensor, through increasing a pressure sensing component, set up two pressure sensing components promptly, three air cavity, the exhaust gets into three air cavity simultaneously, can produce two pressure differentials, to the structural style who arranges the blender behind DPF in six diesel engines in the country, can measure pressure differential around the particulate trap and the pressure differential around the blender simultaneously. In addition, the auxiliary diagnosis of the differential pressure sensor can be realized by judging the rationality of the differential pressure value.
Preferably, the first air cavity, the second air cavity and the third air cavity are connected with the exhaust pipeline through air taps, the structure is simple, the sealing performance is good, the disassembly and the assembly are convenient, and the cost is low.
Preferably, the first pressure sensing element and the second pressure sensing element are of a diaphragm structure, namely, the first pressure sensing element and the second pressure sensing element are pressure sensing diaphragms which are used for isolating the inner cavities of the pressure difference sensor, the pressure sensing diaphragms generate strain under the action of pressure difference between the two cavities, the structure is small in nonlinear error, and the measurement sensitivity is high.
Preferably, the inlet end of the oxidation type catalytic converter, the inlet end of the particle trap and the inlet end of the mixer are provided with temperature sensors, and the blocking condition of the aftertreatment system is better monitored through pressure difference and temperature detection by adopting the cooperation of the pressure difference sensor and the temperature sensors.
The utility model has the advantages that:
1. aiming at the structural form that the mixer is arranged behind the DPF in the national six-diesel engine, the simultaneous diagnosis of DPF blockage and urea crystal blockage of the mixer is realized, the blockage removal is facilitated in an active regeneration mode, and the normal work of an aftertreatment system is ensured.
2. The pressure sensor is simple in structure, and the pressure difference between the two positions is measured only by adding a pressure sensing element and a pressure cavity on the existing pressure difference sensor.
Drawings
Fig. 1 is a schematic diagram of a post-processing system in the prior art.
Fig. 2 is a schematic diagram of a pressure sensor in an aftertreatment system of the prior art.
Fig. 3 is a schematic structural diagram of a device for monitoring clogging of an aftertreatment system of a diesel engine according to the present invention.
Fig. 4 is a schematic structural diagram of the differential pressure sensor according to the present invention.
In the figure: 1-exhaust line, 2-oxidation type catalytic converter, 3-particulate trap, 4-mixer, 5-selective catalytic reduction system, 6-urea injection system, 701-first pressure sensing element, 702-second pressure sensing element, 703-first air chamber, 704-second air chamber, 705-third air chamber.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings.
Example 1:
as shown in fig. 3 and 4, a clogging monitoring device for an aftertreatment system of a diesel engine includes an oxidation-type catalytic converter 2, a particulate trap 3, a mixer 4, and a selective catalytic reduction system 5, which are arranged in this order along an exhaust line 1 of the engine; the device also comprises a urea injection system 6 communicated with the mixer 4, and further comprises a differential pressure sensor 7, wherein the inner cavity of the differential pressure sensor 7 is configured into a first air cavity 703, a second air cavity 704 and a third air cavity 705 which are separated by a first pressure sensing element 701 and a second pressure sensing element 702 and are arranged in sequence, the first air cavity 703 is communicated with an exhaust pipeline 1 between the oxidation type catalytic converter 2 and the particle trap 3, the second air cavity 704 is communicated with an exhaust pipeline 1 between the particle trap 3 and the mixer 4, and the third air cavity 705 is communicated with the exhaust pipeline 1 between the mixer 4 and the selective catalytic reduction system 5.
The working principle of the embodiment is as follows:
as shown in fig. 4, after the first air cavity 703, the second air cavity 704 and the third air cavity 705 inside the differential pressure sensor 7 are communicated with the exhaust pipe 1, after the engine is started, exhaust enters each air cavity through an air tap and a pipeline, a reaction of pressure difference is formed between two sides of the first pressure sensing element 701 and the second pressure sensing element 702, voltage is output according to a pressure-voltage characteristic curve through adjustment and programming of a chip circuit inside the pressure sensor, and the monitoring device calculates the pressure difference through a pressure signal to determine whether the engine is blocked. When the monitoring device detects that the particle catcher 3 is blocked, the engine ECU carries out active regeneration on the particle catcher 3; when the monitoring device detects a blockage of the particle trap 3 or the mixer 4, the regeneration of the mixer 4 is effected by treating the crystals in the same way as the active regeneration of the particle trap 3.
Example 2:
as shown in fig. 3, a clogging monitoring device for an aftertreatment system of a diesel engine includes an oxidation-type catalytic converter 2, a particulate trap 3, a mixer 4, a selective catalytic reduction system 5, which are arranged in this order along an exhaust line 1 of the engine; the urea spraying system 6 is communicated with the mixer 4, and the urea spraying system 6 sprays urea liquid to the mixer 4;
as shown in fig. 4, the present embodiment further includes a differential pressure sensor 7, an inner cavity of the differential pressure sensor 7 is configured as a first air cavity 703, a second air cavity 704 and a third air cavity 705 which are sequentially arranged and are formed by separating a first pressure sensing element 701 and a second pressure sensing element 702, the first air cavity 703 is communicated with the exhaust pipe 1 between the oxidation-type catalytic converter 2 and the particle trap 3, the second air cavity 704 is communicated with the exhaust pipe 1 between the particle trap 3 and the mixer 4, and the third air cavity 705 is communicated with the exhaust pipe 1 between the mixer 4 and the selective catalytic reduction system 5.
The first air cavity 703, the second air cavity 704 and the third air cavity 705 are all connected with the exhaust pipeline 1 through air taps.
The first pressure sensing element 701 and the second pressure sensing element 702 are of diaphragm structures, that is, the first pressure sensing element 701 and the second pressure sensing element 702 are both pressure sensing diaphragms, the pressure sensing diaphragms are used for isolating the inner cavities of the differential pressure sensor 7, and the pressure sensing diaphragms generate strain under the action of pressure difference between the two cavities.
The inlet end of the oxidation type catalytic converter 2, the inlet end of the particle catcher 3 and the inlet end of the mixer 4 are provided with temperature sensors, and the blocking condition of the aftertreatment system is better monitored through pressure difference and temperature detection by adopting the cooperation of the pressure difference sensor 7 and the temperature sensors.
The working principle of the utility model is as follows:
as shown in fig. 4, after the first air cavity 703, the second air cavity 704 and the third air cavity 705 inside the differential pressure sensor 7 are installed and communicated with the corresponding exhaust pipeline 1 through air nozzles, after the engine is started, exhaust enters the first air cavity 703, the second air cavity 704 and the third air cavity 705 through the air nozzles and pipelines, the first pressure sensing element 701 is used for sensing the pressure difference between the first air cavity 703 and the second air cavity 704, the pressure difference is the difference between P1 and P2, the second pressure sensing element 702 is used for sensing the pressure difference between the second air cavity 704 and the third air cavity 705, the pressure difference is the difference between P2 and P3, the diaphragms of the first pressure sensing element 701 and the second pressure sensing element 702 are deformed to generate electric signals, and the voltage is output according to the pressure-voltage characteristic curve through the adjustment and programming of a chip circuit inside the pressure sensor, the monitoring device calculates the pressure difference through the pressure signal and judges whether the blockage occurs. When the monitoring device detects that the particle catcher 3 is blocked, the engine ECU carries out active regeneration on the particle catcher 3; when the monitoring device detects that the particle trap 3 or the mixer 4 is clogged, the regeneration of the mixer 4 is effected by treating the crystals in the same way as in the active regeneration of the DPF.

Claims (4)

1. A diesel engine aftertreatment system blockage monitoring device comprises an oxidation type catalytic converter (2), a particle catcher (3), a mixer (4) and a selective catalytic reduction system (5) which are sequentially communicated and arranged along an exhaust pipeline (1) of an engine; also include urea injection system (6) with blender (4) intercommunication, its characterized in that: the device is characterized by further comprising a differential pressure sensor (7), wherein an inner cavity of the differential pressure sensor (7) is configured into a first air cavity (703), a second air cavity (704) and a third air cavity (705) which are formed by a first pressure sensing element (701) and a second pressure sensing element (702) in a separated mode and are arranged in sequence, the first air cavity (703) is communicated with an exhaust pipeline (1) between the oxidation type catalytic converter (2) and the particle catcher (3), the second air cavity (704) is communicated with the exhaust pipeline (1) between the particle catcher (3) and the mixer (4), and the third air cavity (705) is communicated with the exhaust pipeline (1) between the mixer (4) and the selective catalytic reduction system (5).
2. The diesel engine aftertreatment system plugging monitoring device of claim 1, wherein: the first air cavity (703), the second air cavity (704) and the third air cavity (705) are connected with an exhaust pipeline (1) through air nozzles.
3. The diesel engine aftertreatment system plugging monitoring device of claim 1, wherein: the first pressure sensing element (701) and the second pressure sensing element (702) are of a diaphragm type construction.
4. The diesel engine aftertreatment system plugging monitoring device of claim 1, wherein: and temperature sensors are arranged at the inlet end of the oxidation type catalytic converter (2), the inlet end of the particle catcher (3) and the inlet end of the mixer (4).
CN201921226930.3U 2019-07-31 2019-07-31 Diesel engine aftertreatment system blocks up monitoring devices Active CN210948856U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111894713A (en) * 2020-07-15 2020-11-06 潍柴动力股份有限公司 Method and device for determining crystallization fault of selective catalytic reduction device
CN113483948A (en) * 2021-07-13 2021-10-08 无锡威孚力达催化净化器有限责任公司 Differential pressure pipe detection device and method
CN113530655A (en) * 2021-08-11 2021-10-22 一汽解放汽车有限公司 Urea crystal detection device, urea crystal treatment method, urea crystal treatment device, urea crystal treatment equipment and storage medium
CN114233447A (en) * 2021-12-21 2022-03-25 潍柴动力股份有限公司 Efficiency detection method and device of particle catcher, electronic equipment and storage medium
CN114251163A (en) * 2021-11-23 2022-03-29 潍柴动力股份有限公司 DPF regeneration control method and device, storage medium and vehicle-mounted computer

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111894713A (en) * 2020-07-15 2020-11-06 潍柴动力股份有限公司 Method and device for determining crystallization fault of selective catalytic reduction device
CN111894713B (en) * 2020-07-15 2021-08-20 潍柴动力股份有限公司 Method and device for determining crystallization fault of selective catalytic reduction device
CN113483948A (en) * 2021-07-13 2021-10-08 无锡威孚力达催化净化器有限责任公司 Differential pressure pipe detection device and method
CN113483948B (en) * 2021-07-13 2023-09-12 无锡威孚力达催化净化器有限责任公司 Differential pressure tube detection device and method
CN113530655A (en) * 2021-08-11 2021-10-22 一汽解放汽车有限公司 Urea crystal detection device, urea crystal treatment method, urea crystal treatment device, urea crystal treatment equipment and storage medium
CN113530655B (en) * 2021-08-11 2022-11-22 一汽解放汽车有限公司 Urea crystal detection device, urea crystal treatment method, urea crystal treatment device, urea crystal treatment equipment and storage medium
CN114251163A (en) * 2021-11-23 2022-03-29 潍柴动力股份有限公司 DPF regeneration control method and device, storage medium and vehicle-mounted computer
CN114251163B (en) * 2021-11-23 2023-01-06 潍柴动力股份有限公司 DPF regeneration control method and device, storage medium and vehicle-mounted computer
CN114233447A (en) * 2021-12-21 2022-03-25 潍柴动力股份有限公司 Efficiency detection method and device of particle catcher, electronic equipment and storage medium
CN114233447B (en) * 2021-12-21 2023-05-23 潍柴动力股份有限公司 Efficiency detection method and device for particle catcher, electronic equipment and storage medium

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