CN110657012A - Diesel engine exhaust temperature thermal management system - Google Patents
Diesel engine exhaust temperature thermal management system Download PDFInfo
- Publication number
- CN110657012A CN110657012A CN201910784724.2A CN201910784724A CN110657012A CN 110657012 A CN110657012 A CN 110657012A CN 201910784724 A CN201910784724 A CN 201910784724A CN 110657012 A CN110657012 A CN 110657012A
- Authority
- CN
- China
- Prior art keywords
- heat preservation
- preservation pipe
- opening valve
- auxiliary heater
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
- F01N13/141—Double-walled exhaust pipes or housings
- F01N13/146—Double-walled exhaust pipes or housings with vacuum in the space between both walls
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
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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
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/16—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an electric heater, i.e. a resistance heater
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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 provides a diesel engine exhaust temperature thermal management system, which comprises a diesel engine exhaust access three-way pipe, a heat preservation pipe opening valve arranged on the heat preservation pipe, a non-heat preservation pipe opening valve arranged on the non-heat preservation pipe, an auxiliary heater exhaust access three-way pipe, an auxiliary heater, a fastener, a post-processing device and a temperature sensor, wherein the auxiliary heater exhaust access three-way pipe is connected with the heat preservation pipe; the heat preservation pipe opening valve, the non-heat preservation pipe opening valve, the temperature sensor and the auxiliary heater are all connected with the ECU. The heat-insulating pipe, the non-heat-insulating pipe, the heat-insulating pipe opening valve, the non-heat-insulating pipe opening valve and the auxiliary heater in the invention have the synergistic effect of better controlling the temperature of the tail gas entering the post-treatment device, so that the diesel engine tail gas post-treatment device is in a more efficient working interval in the whole working condition range. The system is suitable for the tail gas after-treatment device of the diesel engine with a mobile source and a fixed source.
Description
Technical Field
The invention belongs to the field of diesel engine tail gas treatment, and particularly relates to a diesel engine exhaust temperature thermal management system.
Background
According to the annual newspaper of environmental management of Chinese motor vehicles in 2018, the problem of mobile sources in China is increasingly prominent and becomes an important source of air pollution, and diesel vehicles contribute more than 99% of PM emission and more than 60% of NOx emission of the mobile sources. In addition to the problem of moving sources, China currently keeps a large number of fixed source diesel engines which are used for power generation, production and other purposes in factories, and the problem of fixed source pollution is also severe. Pollutants in the exhaust of diesel engines mainly include Hydrocarbons (HC), carbon monoxide (CO), Nitrogen Oxides (NOX) and Particulate Matter (PM).
The diesel engine tail gas treatment device mainly comprises an oxidation type catalytic converter (DOC), a particulate matter trap (DPF) and a selective catalytic reduction device (SCR), wherein the DOC is mainly used for converting CO and HC, the DPF is used for trapping particulate matters, and the SCR is used for converting NOX.
In the diesel engine tail gas treatment device, the ignition temperature of the DOC to CO and HC is 200-300 ℃, when the particulate matters in the DPF are accumulated to a certain degree and need to be regenerated, the required temperature is up to 550 ℃, and when a catalytic particulate matter trap (CDPF) is used, the regeneration temperature of the CDPF can be reduced to about 300 ℃. For SCR, different types of catalysts have different high efficiency temperature windows. These data mean that in the field of diesel exhaust gas management, diesel exhaust temperature is an important factor affecting the efficiency of the exhaust gas management device.
The traditional diesel engine exhaust system can not conduct thermal management on exhaust temperature, can not enable an aftertreatment device to be always in a high-efficiency working area, and is low in conversion efficiency. The invention can realize the thermal management of the exhaust temperature of the diesel engine, thereby having practical application significance.
Disclosure of Invention
In view of this, the present invention is directed to a thermal management system for exhaust temperature of a diesel engine, so as to ensure that the exhaust temperature of the diesel engine is always in an efficient working range of an aftertreatment device.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a diesel engine exhaust temperature thermal management system comprises a diesel engine exhaust access three-way pipe, a heat preservation pipe opening valve arranged on the heat preservation pipe, a non-heat preservation pipe opening valve arranged on the non-heat preservation pipe, an auxiliary heater exhaust access three-way pipe, an auxiliary heater, a fastener, a post-processing device and a temperature sensor;
the exhaust gas access three-way pipe of the diesel engine is respectively connected with the front ends of the heat preservation pipe and the non-heat preservation pipe, the rear ends of the heat preservation pipe and the non-heat preservation pipe are connected with an auxiliary, the exhaust gas access three-way pipe of the auxiliary heater is connected with the couch heater, the rear end of the auxiliary heater is connected with the post-treatment device, the exhaust gas access three-way pipe of the auxiliary heater is connected with the auxiliary heater through a fastener, the auxiliary heater is connected with the post-treatment device through a fastener, and the temperature sensor is arranged at the inlet of the post-treatment device;
the heat preservation pipe opening valve, the non-heat preservation pipe opening valve, the temperature sensor and the auxiliary heater are all connected with the ECU.
Furthermore, the heat preservation pipe is a double-layer stainless steel vacuum structure, and the middle layer is vacuumized to block heat conduction.
Furthermore, the auxiliary heater comprises a shell, a heating resistance wire, a ceramic column and a heater power connector, wherein the heating resistance wire is wound on the ceramic column and is connected with the heater power connector.
Furthermore, the fastener comprises a fastening nut, a fastening gasket, a sealing gasket and a fastening bolt, the fastening nut is connected with the fastening bolt, and the fastening gasket and the sealing gasket are arranged at the joint of the fastening nut and the fastening bolt.
The invention also aims to provide a thermal management method for the exhaust temperature of the diesel engine, which comprises the following steps:
(1) the temperature sensor is used for monitoring the inlet temperature of the post-processing device;
(2) when the inlet temperature is lower than a set threshold value, the ECU sends a control signal to open the opening valve of the heat preservation pipe and close the opening valve of the non-heat preservation pipe to preserve heat of the exhaust gas;
(3) and when the exhaust temperature is higher than the set threshold value, controlling the opening valve of the heat preservation pipe to be closed and the opening valve of the non-heat preservation pipe to be opened.
Compared with the prior art, the diesel engine exhaust temperature thermal management system has the following advantages:
the synergistic effect of the heat-insulating pipe, the non-heat-insulating pipe, the heat-insulating pipe opening valve, the non-heat-insulating pipe opening valve and the auxiliary heater can better control the temperature of the tail gas entering the post-treatment device, so that the diesel engine tail gas post-treatment device is in a more efficient working range in the whole working condition range. The system is suitable for the tail gas after-treatment device of the diesel engine with a mobile source and a fixed source.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the insulating tube according to the present invention;
FIG. 3 is a schematic view of an auxiliary heater;
FIG. 4 is a schematic view of a fastener construction;
FIG. 5 is a schematic view showing the structure of the apparatus in which only the thermal insulation pipe and the auxiliary heater are installed;
in the figure, 1-diesel engine exhaust gas access three-way pipe, 2-insulating pipe opening valve, 3-insulating pipe, 4-auxiliary heater exhaust gas access three-way pipe, 5-auxiliary heater, 51-shell, 52-heating resistance wire, 53-ceramic column, 54-heater power supply connector, 6-fastener, 61-fastening nut, 62-fastening gasket, 63-sealing gasket, 694-fastening bolt, 7-post-processing device, 8-temperature sensor, 9-non-insulating pipe and 10-non-insulating pipe opening valve.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. 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," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
As shown in fig. 1-5, the invention provides a diesel engine exhaust temperature thermal management system, which comprises a diesel engine exhaust access three-way pipe 1, a heat preservation pipe opening valve 2, a heat preservation pipe 3, an auxiliary heater exhaust access three-way pipe 4, an auxiliary heater 5, a fastener 6, a post-processing device 7, a temperature sensor 8, a non-heat preservation pipe 9 and a non-heat preservation pipe opening valve 10.
The insulating tube 3 is a double-layer stainless steel vacuum structure, as shown in fig. 2, the middle layer is vacuumized to block heat conduction. As shown in fig. 3, the auxiliary heater 5 can further heat the exhaust air in cooperation with the insulating tube 3 or the non-insulating tube 9 according to the exhaust air temperature, and the auxiliary heater mainly comprises a shell 51, a heating resistance wire 52, a ceramic column 53 and a heater power supply connector 54.
Frequent start-stop working conditions:
under the frequent start-stop working condition, when the temperature sensor 8 monitors that the temperature is lower than a set threshold value, the ECU sends out a control signal, so that the opening valve 2 of the heat preservation pipe is opened, the opening valve 10 of the non-heat preservation pipe is closed, and the exhaust is subjected to heat preservation. When the exhaust temperature still does not reach the high-efficiency working temperature interval of the post-processor, the auxiliary heater 5 is electrified to further heat the exhaust gas.
The frequent start-stop working condition is converted into a long-time high exhaust temperature operation working condition:
when the working condition is switched, the auxiliary heater 5 is firstly closed when the temperature sensor 8 monitors that the exhaust temperature is higher than a set threshold value; if the exhaust temperature is still higher than the exhaust temperature setting threshold value, the ECU sends out a control signal to close the heat preservation pipe opening valve 2 and open the non-heat preservation pipe opening valve 10 without preserving the exhaust heat.
Example 2
A thermal management system for exhaust temperature of a diesel engine is shown in figure 5, when the exhaust temperature of the engine is at a low temperature for a long time, only a heat preservation pipe 3 and an auxiliary heater 5 can be used, a non-heat preservation pipe is not used, and a heat preservation pipe opening valve 2 can be used or not used (not used in the embodiment). When the exhaust temperature sensor 8 monitors that the exhaust temperature is lower than the set threshold, the auxiliary heater 5 is powered on to further heat the exhaust. When the exhaust temperature sensor 8 monitors that the exhaust temperature is higher than the set threshold value, the auxiliary heater 5 is turned off, and the exhaust temperature is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A diesel engine exhaust temperature thermal management system characterized in that: the system comprises a diesel engine exhaust access three-way pipe, a heat preservation pipe opening valve arranged on the heat preservation pipe, a non-heat preservation pipe opening valve arranged on the non-heat preservation pipe, an auxiliary heater exhaust access three-way pipe, an auxiliary heater, a fastener, a post-processing device and a temperature sensor;
the exhaust gas access three-way pipe of the diesel engine is respectively connected with the front ends of the heat preservation pipe and the non-heat preservation pipe, the rear ends of the heat preservation pipe and the non-heat preservation pipe are connected with an auxiliary, the exhaust gas access three-way pipe of the auxiliary heater is connected with the couch heater, the rear end of the auxiliary heater is connected with the post-treatment device, the exhaust gas access three-way pipe of the auxiliary heater is connected with the auxiliary heater through a fastener, the auxiliary heater is connected with the post-treatment device through a fastener, and the temperature sensor is arranged at the inlet of the post-treatment device;
the heat preservation pipe opening valve, the non-heat preservation pipe opening valve, the temperature sensor and the auxiliary heater are all connected with the ECU.
2. The diesel exhaust temperature thermal management system of claim 1, wherein: the heat preservation pipe is a double-layer stainless steel vacuum structure, and the middle layer is vacuumized to block heat conduction.
3. The diesel exhaust temperature thermal management system of claim 1, wherein: the auxiliary heater comprises a shell, a heating resistance wire, a ceramic column and a heater power connector, wherein the heating resistance wire is wound on the ceramic column, and the heating resistance wire is connected with the heater power connector.
4. The diesel exhaust temperature thermal management system of claim 1, wherein: the fastening piece comprises a fastening nut, a fastening gasket, a sealing gasket and a fastening bolt, wherein the fastening nut is connected with the fastening bolt, and the fastening gasket and the sealing gasket are arranged at the joint of the fastening nut and the fastening bolt.
5. A thermal management method for exhaust temperature of a diesel engine is characterized by comprising the following steps: the method comprises the following steps:
(1) the temperature sensor is used for monitoring the inlet temperature of the post-processing device;
(2) when the inlet temperature is lower than a set threshold value, the ECU sends a control signal to open the opening valve of the heat preservation pipe and close the opening valve of the non-heat preservation pipe to preserve heat of the exhaust gas;
(3) and when the exhaust temperature is higher than the set threshold value, controlling the opening valve of the heat preservation pipe to be closed and the opening valve of the non-heat preservation pipe to be opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910784724.2A CN110657012A (en) | 2019-08-23 | 2019-08-23 | Diesel engine exhaust temperature thermal management system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910784724.2A CN110657012A (en) | 2019-08-23 | 2019-08-23 | Diesel engine exhaust temperature thermal management system |
Publications (1)
| Publication Number | Publication Date |
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| CN110657012A true CN110657012A (en) | 2020-01-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910784724.2A Pending CN110657012A (en) | 2019-08-23 | 2019-08-23 | Diesel engine exhaust temperature thermal management system |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070095054A1 (en) * | 2005-11-03 | 2007-05-03 | Goebelbecker Michael S | Dual walled particular filter for transporting filtered exhaust to a compressor of a diesel engine turbocharger |
| CN200981021Y (en) * | 2006-09-13 | 2007-11-28 | 大连海事大学 | Needle array electrode bipolar catching high-temperature carbon smoke device |
| CN101233305A (en) * | 2005-07-29 | 2008-07-30 | 丰田自动车株式会社 | Exhaust purification system for internal combustion engine |
| CN202273741U (en) * | 2011-10-20 | 2012-06-13 | 浙江摩多巴克斯汽配有限公司 | Stainless steel exhaust manifold structure |
| CN102644502A (en) * | 2011-02-17 | 2012-08-22 | 刘成 | Double-channel multifunctional engine exhaust pipe |
| DE102014107006A1 (en) * | 2013-05-31 | 2014-12-04 | GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) | Exhaust gas treatment system with emission control during a filter regeneration |
| CN105927338A (en) * | 2015-02-26 | 2016-09-07 | 福特环球技术公司 | Systems and methods for differential heating of exhaust catalysts |
| CN109281736A (en) * | 2018-09-28 | 2019-01-29 | 潍柴动力股份有限公司 | Passive oxynitrides absorption PNA system, after-treatment system and control method |
-
2019
- 2019-08-23 CN CN201910784724.2A patent/CN110657012A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101233305A (en) * | 2005-07-29 | 2008-07-30 | 丰田自动车株式会社 | Exhaust purification system for internal combustion engine |
| US20070095054A1 (en) * | 2005-11-03 | 2007-05-03 | Goebelbecker Michael S | Dual walled particular filter for transporting filtered exhaust to a compressor of a diesel engine turbocharger |
| CN200981021Y (en) * | 2006-09-13 | 2007-11-28 | 大连海事大学 | Needle array electrode bipolar catching high-temperature carbon smoke device |
| CN102644502A (en) * | 2011-02-17 | 2012-08-22 | 刘成 | Double-channel multifunctional engine exhaust pipe |
| CN202273741U (en) * | 2011-10-20 | 2012-06-13 | 浙江摩多巴克斯汽配有限公司 | Stainless steel exhaust manifold structure |
| DE102014107006A1 (en) * | 2013-05-31 | 2014-12-04 | GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) | Exhaust gas treatment system with emission control during a filter regeneration |
| CN105927338A (en) * | 2015-02-26 | 2016-09-07 | 福特环球技术公司 | Systems and methods for differential heating of exhaust catalysts |
| CN109281736A (en) * | 2018-09-28 | 2019-01-29 | 潍柴动力股份有限公司 | Passive oxynitrides absorption PNA system, after-treatment system and control method |
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Effective date of registration: 20200511 Address after: 300300 No. 68, Xianfeng East Road, Dongli District, Tianjin Applicant after: CHINA AUTOMOTIVE TECHNOLOGY AND RESEARCH CENTER Co.,Ltd. Applicant after: AERI (TIANJIN) AUTOMOTIVE ENGINEERING RESEARCH INSTITUTE Co.,Ltd. Address before: 300300 No. 68, Xianfeng East Road, Dongli District, Tianjin Applicant before: CHINA AUTOMOTIVE TECHNOLOGY AND RESEARCH CENTER Co.,Ltd. Applicant before: CAIC Research Automotive Industrial Engineering (Tianjin) Co., Ltd. |
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Application publication date: 20200107 |
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