CN114718703A - Aftertreatment heating device and control strategy of hybrid electric vehicle - Google Patents
Aftertreatment heating device and control strategy of hybrid electric vehicle Download PDFInfo
- Publication number
- CN114718703A CN114718703A CN202210391938.5A CN202210391938A CN114718703A CN 114718703 A CN114718703 A CN 114718703A CN 202210391938 A CN202210391938 A CN 202210391938A CN 114718703 A CN114718703 A CN 114718703A
- Authority
- CN
- China
- Prior art keywords
- heating
- heating device
- temperature
- heating mechanism
- control strategy
- 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
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 125
- 238000011217 control strategy Methods 0.000 title claims description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 44
- 239000003054 catalyst Substances 0.000 claims abstract description 36
- 230000008025 crystallization Effects 0.000 claims abstract description 31
- 238000002425 crystallisation Methods 0.000 claims abstract description 29
- 230000003647 oxidation Effects 0.000 claims abstract description 24
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 24
- 229910052751 metal Inorganic materials 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 23
- 238000006555 catalytic reaction Methods 0.000 claims abstract description 16
- 238000010531 catalytic reduction reaction Methods 0.000 claims abstract description 12
- 238000005485 electric heating Methods 0.000 claims abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 4
- 239000013078 crystal Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 10
- 230000008929 regeneration Effects 0.000 claims description 8
- 238000011069 regeneration method Methods 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000004088 simulation Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 abstract description 15
- 239000004202 carbamide Substances 0.000 abstract description 15
- 239000003344 environmental pollutant Substances 0.000 abstract description 13
- 231100000719 pollutant Toxicity 0.000 abstract description 13
- 230000001603 reducing effect Effects 0.000 abstract description 6
- 230000001590 oxidative effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 11
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 101100204059 Caenorhabditis elegans trap-2 gene Proteins 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 206010021198 ichthyosis Diseases 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
-
- 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
- F01N2250/00—Combinations of different methods of purification
- F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
-
- 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
- F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
- F01N2590/11—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for hybrid vehicles
-
- 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
-
- 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 is suitable for the field of automobile power equipment, and provides a post-treatment heating device of a hybrid electric vehicle, which comprises a diesel oxidation catalyst, a particle catcher, a selective catalytic reduction device and an electric heating device, wherein the diesel oxidation catalyst is used for oxidizing the diesel oxidation catalyst; the electric heating device comprises a first heating mechanism and a second heating mechanism; the diesel oxidation catalyst comprises a shell and a catalytic reaction plate which is arranged in the shell and provided with a plurality of airflow channels, wherein one side of the shell is provided with a connecting electrode; the first heating mechanism is a resistance metal sheet in a spiral structure; the resistance metal sheet is embedded in the catalytic reaction plate, and two ends of the resistance metal sheet are connected with the connecting electrodes; the connecting electrode is connected with an external power supply, so that the catalyst temperature and the exhaust temperature of the engine under the working condition of starting or low temperature can be increased, the capability of reducing the emission of pollutants by post-treatment can be improved, and the urea crystallization can be reduced and eliminated by controlling a heating strategy.
Description
Technical Field
The invention relates to the field of automobile power equipment, in particular to a post-processing heating device and a control strategy of a hybrid electric vehicle.
Background
China implements the national six-emission standard of heavy-duty automobiles. The control on the pollutant emission of an automobile engine is more strict, and the requirement on the treatment capacity of an engine post-treatment system is higher; because the optimum working temperature of the catalyst reaction is about 250-550 ℃, and the spraying temperature of the urea aqueous solution is about 185 ℃ (the treatment of the exhaust pollutants is started only at 185 ℃), the treatment of the exhaust pollutants of the engine has the following problems:
1. in a period of time after the ignition of the engine is started or under the condition of low exhaust temperature of the engine under other conditions, exhaust pollutants cannot be treated and directly discharged;
2. under the idle speed or low-load working condition of the engine, the exhaust temperature is low, the conversion efficiency of exhaust pollutants is low, and the exhaust pollutant emission is large.
At present, the main pollutants of the national six diesel engine are nitrogen oxide and particulate matters, and the post-treated catalyst and catalytic units are DOC, DPF and SCR.
DOC (diesel oxidation catalyst): DOCs typically have metal or ceramic as the catalyst support. When diesel engine exhaust passes through the catalyst, hydrocarbon, carbon monoxide and the like can quickly react with oxygen in the exhaust at a certain temperature to generate pollution-free H2O and CO 2.
DPF (particulate trap): the DPF is installed in an exhaust system, particulate matters in exhaust gas can be filtered and captured through the DPF, the particulate matters in the exhaust gas can be reduced, and the filtering effect can reach more than 90% generally.
SCR (selective catalytic reduction): urea is mainly used as a reducing agent, and nitrogen oxides in tail gas are reduced into nitrogen and water under the reducing action of a selective catalyst. Currently, the SCR technology is most used on the domestic heavy truck.
A mixer: the urea mixer is generally arranged in front of the SCR and used for dispersing and crushing the urea solution and uniformly mixing the urea solution with the tail gas, so that the urea mixer plays a role in improving the conversion efficiency and reducing urea crystals.
In view of the foregoing, it is apparent that the prior art has inconvenience and disadvantages in practical use, and thus, needs to be improved.
Disclosure of Invention
In view of the above-mentioned drawbacks, an object of the present invention is to provide an aftertreatment heating device and a control strategy for a hybrid vehicle, which can increase the catalyst temperature and the exhaust gas temperature of an engine at the time of starting or under a low-temperature condition, i.e., increase the ability of aftertreatment to reduce exhaust pollutants, and simultaneously reduce and eliminate urea crystals by controlling the heating strategy.
In order to achieve the above object, the present invention provides an aftertreatment heating device for a hybrid vehicle, comprising a diesel oxidation catalyst, a particulate filter, a selective catalytic reduction device and an electric heating device; the electric heating device comprises a first heating mechanism arranged inside the diesel oxidation catalyst and a second heating mechanism arranged inside the selective catalytic reduction device; the diesel oxidation catalyst comprises a shell and a catalytic reaction plate which is arranged in the shell and provided with a plurality of airflow channels, wherein one side of the shell is provided with a connecting electrode; the first heating mechanism is a resistance metal sheet in a spiral structure; the resistance metal sheet is embedded in the catalytic reaction plate, and two ends of the resistance metal sheet are connected with the connecting electrodes; the connecting electrode is connected with an external power supply.
According to the aftertreatment heating device of the hybrid electric vehicle, the connecting electrode is connected with the power battery of the hybrid electric vehicle through the DC-DC, one end of the DC-DC is connected with the connecting electrode, and the other end of the DC-DC is connected with the power battery.
The control strategy of the aftertreatment heating device of the hybrid electric vehicle comprises the steps of S1: starting a heating subprogram, judging that the automobile is in a starting state and can be in a normal motion state, and if the automobile is in the starting state, controlling the maximum power starting of the first heating mechanism and the second heating mechanism by the heating subprogram; if the automobile is in a normal motion state, the heating subprogram continuously judges the states of the DOC and the SCR; s2: controlling the post-treatment heating device to start heating according to the condition subprogram; when the DOC is detected to be in a low-temperature working condition, the heating subprogram controls the first heating mechanism to be started at a low power; when the DOC is detected to be in a high-temperature working condition, the heating subprogram controls the first heating mechanism to be closed; the heating sub-program controls the second heating mechanism to be switched on or switched off according to preset conditions.
According to the control strategy of the aftertreatment heating device of the hybrid electric vehicle, the starting state of the vehicle is judged by monitoring the rotating speed n of the engine through the rotating speed sensor; when the engine speed n reaches a preset speed, the subroutine condition is achieved; when the engine speed n does not reach the preset speed, the speed sensor monitors the engine again.
According to the control strategy of the post-treatment heating device of the hybrid electric vehicle, whether the SCR needs to be heated or not is judged by adopting a crystallization boundary method, a crystallization boundary Map of post-treatment different exhaust flow rates Q and exhaust temperatures T needs to be obtained in advance through a test or simulation calculation method, the exhaust flow rates Q and the exhaust temperatures T are collected in the program operation and are compared with the crystallization boundary Map, and a second heating mechanism is started when the exhaust flow rates Q and the exhaust temperatures T are below the crystallization boundary; when the exhaust gas flow rate Q and the exhaust gas temperature T are not less than the crystal boundary, the second heating means is turned off.
According to the control strategy of the post-treatment heating device of the hybrid electric vehicle, whether the mixer needs to be heated is judged by adopting a method for detecting the wall surface temperature of the mixer, and if the wall surface temperature T is less than the crystallization critical temperature T5, a second heating mechanism is started; if the wall temperature T > the crystallization critical temperature T5+ the safety margin T6, the second heating means is closed.
The control strategy of the post-treatment heating device of the hybrid electric vehicle is characterized in that crystals are cleaned in a mode of heating a mixer for a fixed time and high power, and crystal regeneration mileage of different vehicle types and different use environments is obtained in advance by a test or simulation calculation method; when the regeneration mileage is reached each time in the normal use process, the fixed mileage crystallization cleaning program is started. According to the control strategy of the aftertreatment heating device of the hybrid electric vehicle, if the engine running mode is switched to the pure electric mode or the engine is stopped, the heating subprogram is stopped.
The invention provides a post-treatment heating device of a hybrid electric vehicle, which comprises a diesel oxidation catalyst, a particle catcher, a selective catalytic reduction device and an electric heating device, wherein the diesel oxidation catalyst is arranged on the diesel oxidation catalyst; the electric heating device comprises a first heating mechanism arranged inside the diesel oxidation catalyst and a second heating mechanism arranged inside the selective catalytic reduction device; the diesel oxidation catalyst comprises a shell and a catalytic reaction plate which is arranged in the shell and provided with a plurality of airflow channels, wherein the catalytic reaction plate can be a metal plate or a ceramic plate; one side of the shell is provided with a connecting electrode; the first heating mechanism is a resistance metal sheet in a spiral structure; the resistance metal sheet is embedded in the catalytic reaction plate, and two ends of the resistance metal sheet are connected with the connecting electrodes; the connecting electrode is connected with an external power supply. The first heating mechanism and the second heating mechanism are consistent in structure. The invention can improve the catalyst temperature and the exhaust temperature of the engine under the working condition of starting or low temperature, namely, the capability of reducing the exhaust pollutants by post-treatment can be improved, and the urea crystallization can be reduced and eliminated by controlling the heating strategy.
Drawings
FIG. 1 is a block diagram of a post-treatment device for a six-diesel engine in China; FIG. 2 is a schematic diagram of the oxidation catalyst of the oil engine of FIG. 1; FIG. 3 is a schematic structural view of the present invention; FIG. 4 is a cross-sectional view in the axial direction of FIG. 3;
FIG. 5 is a cross-sectional view taken along the vertical axis of FIG. 3; FIG. 6 is a flow chart of a control strategy for an aftertreatment heating device; FIG. 7 is a control strategy for a vehicle in a low temperature condition; FIG. 8 is a control strategy for an automobile in a high temperature condition; FIG. 9 is a first daily operating reduced crystallization sequence in a mixer; FIG. 10 is a second daily routine in the mixer to reduce crystallization; FIG. 11 is a control strategy for a fixed-range clean-up crystallization program in a mixer; in the figure, 1-diesel oxidation catalyst, 100-housing, 101-connecting electrode, 102-catalytic reaction plate, 103-gas flow channel, 104-resistance metal sheet, 2-particle trap, 3-selective catalytic reducer, 41-first heating mechanism.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments, it being understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
Referring to fig. 1, 2, 3, 4 and 5, the present invention provides an aftertreatment heating device and a control strategy for a hybrid vehicle, the aftertreatment heating device for a hybrid vehicle includes a diesel oxidation catalyst 1, a particulate trap 2, a selective catalytic reduction device 3 and an electric heating device;
the electric heating device comprises a first heating mechanism 41 arranged inside the diesel oxidation catalyst 1 and a second heating mechanism arranged inside the selective catalytic reduction device 3;
the diesel oxidation catalyst comprises a shell 100 and a catalytic reaction plate 102 which is arranged in the shell 100 and is provided with a plurality of airflow channels 103, wherein the catalytic reaction plate 102 can be a metal plate or a ceramic plate;
the first heating mechanism 41 includes a resistance metal sheet 104 having a spiral structure and a connection electrode 101 disposed on one side of the housing 100; the resistance metal sheet is embedded in the catalytic reaction plate 102, and two ends of the resistance metal sheet are connected with the connecting electrode 101; the connection electrode 101 is connected to an external power supply.
The first heating mechanism 41 and the second heating mechanism have the same structure.
Referring to fig. 6, the present invention also provides a control strategy for an aftertreatment heating device of a hybrid vehicle, the control strategy comprising:
s1: starting a heating subprogram, judging that the automobile is in a starting state and can be in a normal motion state, and if the automobile is in the starting state, controlling the maximum power of the first heating mechanism 41 and the maximum power of the second heating mechanism to be switched on by the heating subprogram; if the automobile is in a normal motion state, the heating subprogram continuously judges the states of the DOC and the SCR;
s2: controlling the post-treatment heating device to start heating according to the condition subprogram;
when the DOC is detected to be in a low-temperature working condition, the heating subprogram controls the first heating mechanism 41 to be opened at a low power; when the DOC is detected to be in a high-temperature working condition, the heating subprogram controls the first heating mechanism 41 to be closed;
the heating sub-program controls the second heating mechanism to be switched on or switched off according to preset conditions.
And starting a heating subprogram, initially judging the starting of the automobile (the rotating speed n of the engine jumps from 0), determining that the catalyst heating and the mixer heating are started after the starting, and realizing rapid heating by adopting a high-power heating mode. Therefore, the urea aqueous solution can be quickly sprayed after the automobile is started, and exhaust pollutants can be quickly treated. Then, it is judged whether or not the exhaust gas temperature T reaches a high temperature T1, and the catalyst and the mixer stop heating after the high temperature condition is reached.
Referring to fig. 7, the low-temperature condition heating subroutine initially determines whether the low-temperature condition is satisfied by determining whether the rotation speed n, the power P, and the exhaust temperature T reach the limit values, and starts the catalyst and the mixer for heating after determining the low-temperature condition, and the low-power heating is adopted under the low-temperature condition. It is then determined whether the exhaust pollutants in a cycle are less than a limit or whether the exhaust temperature T reaches a high temperature T1, and if so, heating is turned off to conserve energy.
Referring to fig. 8, in the case of DPF regeneration or other high engine exhaust temperature during the operation of the vehicle, the post-treatment heating is immediately stopped by determining whether the exhaust temperature T reaches a high temperature T3 to save energy;
preferably, when the engine operation mode is switched to the electric only mode or the engine is stopped (n is 0), the aftertreatment heating is immediately stopped to save energy.
The control strategy for reducing post-treatment urea crystallization is divided into three subroutines:
referring to fig. 9, the first daily operation crystallization reduction program determines whether the mixer needs to be heated by using a crystallization boundary method, and a crystallization boundary Map of the post-treatment with different exhaust gas flow rates Q and exhaust gas temperatures T needs to be obtained in advance by a method of experiment or simulation calculation. Collecting exhaust flow Q and exhaust temperature T in the program operation, comparing with a crystallization boundary Map, and starting a mixer to heat below the crystallization boundary; when the exhaust flow rate Q and the exhaust temperature T are not less than the crystal boundary, heating is stopped.
Referring to fig. 10, the second routine reduces crystallization by detecting the wall temperature of the mixer to determine whether the mixer needs to be heated, turning on the mixer for heating if the wall temperature T is less than the crystallization critical temperature T5, and turning off the mixer for heating if the wall temperature T is greater than the crystallization critical temperature T5+ a safety margin T6.
Referring to fig. 11, the fixed-mileage crystal cleaning procedure adopts a method of heating the mixer in a fixed time and a large power to clean the crystal, and crystal regeneration mileage of different vehicle types and different use environments needs to be obtained in advance through a test or a simulation calculation method. When the urea crystal is used normally, a fixed mileage cleaning crystallization program is started when the crystallization regeneration mileage L0 is reached (the driving mileage L reaches integral multiple of the regeneration mileage), namely, the mixer is started to heat at high power, and the heating temperature and the heating time are required to be reached, so that the urea crystal is decomposed at high temperature. In order to deal with the crystal which is difficult to clean especially or the crystal which still exists after the crystal is cleaned by a fixed mileage, a manual cleaning button can be arranged.
In summary, the present invention provides a post-treatment heating device for a hybrid electric vehicle, which comprises a diesel oxidation catalyst, a particulate trap, a selective catalytic reduction device and an electric heating device; the electric heating device comprises a first heating mechanism arranged inside the diesel oxidation catalyst and a second heating mechanism arranged inside the selective catalytic reduction device; the diesel oxidation catalyst comprises a shell and a catalytic reaction plate which is arranged in the shell and provided with a plurality of airflow channels, wherein the catalytic reaction plate can be a metal plate or a ceramic plate; one side of the shell is provided with a connecting electrode; the first heating mechanism is a resistance metal sheet in a spiral structure; the resistance metal sheet is embedded in the catalytic reaction plate, and two ends of the resistance metal sheet are connected with the connecting electrodes; the connecting electrode is connected with an external power supply. The first heating mechanism and the second heating mechanism are consistent in structure. The invention can improve the catalyst temperature and the exhaust temperature of the engine under the working condition of starting or low temperature, namely, the capability of reducing the exhaust pollutants by post-treatment can be improved, and the urea crystallization can be reduced and eliminated by controlling the heating strategy.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. The post-treatment heating device of the hybrid electric vehicle is characterized by comprising a diesel oxidation catalyst, a particle trap, a selective catalytic reduction device and an electric heating device;
the electric heating device comprises a first heating mechanism arranged inside the diesel oxidation catalyst and a second heating mechanism arranged inside the selective catalytic reduction device;
the diesel oxidation catalyst comprises a shell and a catalytic reaction plate which is arranged in the shell and provided with a plurality of airflow channels;
the first heating mechanism comprises a resistance metal sheet in a spiral structure and a connecting electrode arranged on one side of the shell; the resistance metal sheet is embedded in the catalytic reaction plate, and two ends of the resistance metal sheet are connected with the connecting electrodes; the connecting electrode is connected with an external power supply.
2. The aftertreatment heating device of a hybrid vehicle of claim 1, wherein the connecting electrode is connected to a power battery of the hybrid vehicle by a DC-DC connection, the DC-DC connection being connected to the connecting electrode at one end and to the power battery at the other end.
3. A control strategy applied to the aftertreatment heating device of the hybrid vehicle according to claim 1 or 2, characterized by comprising:
s1: starting a heating subprogram, judging that the automobile is in a starting state and can be in a normal motion state, and if the automobile is in the starting state, controlling the maximum power starting of the first heating mechanism and the second heating mechanism by the heating subprogram; if the automobile is in a normal motion state, the heating subprogram continuously judges the states of the DOC and the SCR;
s2: controlling the post-treatment heating device to start heating according to the condition subprogram;
when the DOC is detected to be in a low-temperature working condition, the heating subprogram controls the first heating mechanism to be started at a low power; when the DOC is detected to be in a high-temperature working condition, the heating subprogram controls the first heating mechanism to be closed;
the heating sub-program controls the second heating mechanism to be switched on or switched off according to preset conditions.
4. The control strategy of the aftertreatment heating device of the hybrid vehicle according to claim 3, wherein the judgment of the vehicle start-up state is judged by monitoring an engine speed n through a speed sensor; when the engine speed n reaches the preset speed, the subroutine condition is achieved; when the engine speed n does not reach the preset speed, the speed sensor monitors the engine again.
5. The control strategy of the aftertreatment heating device of the hybrid electric vehicle according to claim 3, characterized in that whether the SCR needs to be heated is judged by adopting a crystallization boundary method, a crystallization boundary Map of different aftertreatment exhaust flow rates Q and exhaust temperatures T is obtained in advance by a test or simulation calculation method, and the exhaust flow rates Q and the exhaust temperatures T are collected during program operation and are compared with the crystallization boundary Map;
when the exhaust flow Q and the exhaust temperature T are below the crystallization boundary, starting a second heating mechanism;
when the exhaust gas flow rate Q and the exhaust gas temperature T are not less than the crystal boundary, the second heating means is turned off.
6. The control strategy of the aftertreatment heating device of the hybrid vehicle according to claim 3, wherein the method of detecting the wall surface temperature of the mixer is adopted to judge whether the mixer needs to be heated;
if the wall temperature T is less than the crystallization critical temperature T5, the second heating mechanism is started;
if the wall temperature T > the crystallization critical temperature T5+ the safety margin T6, the second heating means is turned off.
7. The control strategy of the post-treatment heating device of the hybrid electric vehicle as claimed in claim 1, characterized in that the crystal is cleaned by heating the mixer with a high power for a certain time, and the regeneration mileage of the crystal in different models and different use environments is obtained by a method of experiment or simulation calculation in advance;
when the regeneration mileage is reached each time in the normal use process, the fixed mileage crystallization cleaning program is started.
8. The control strategy for the aftertreatment heating device of the hybrid vehicle according to any one of claims 3 to 7, wherein the heating subroutine is stopped when the engine operation mode is switched to the electric only mode or the engine is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210391938.5A CN114718703A (en) | 2022-04-14 | 2022-04-14 | Aftertreatment heating device and control strategy of hybrid electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210391938.5A CN114718703A (en) | 2022-04-14 | 2022-04-14 | Aftertreatment heating device and control strategy of hybrid electric vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114718703A true CN114718703A (en) | 2022-07-08 |
Family
ID=82244613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210391938.5A Pending CN114718703A (en) | 2022-04-14 | 2022-04-14 | Aftertreatment heating device and control strategy of hybrid electric vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114718703A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115263506A (en) * | 2022-08-17 | 2022-11-01 | 一汽解放汽车有限公司 | Engine postprocessor assembly |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08281122A (en) * | 1994-05-30 | 1996-10-29 | Toyota Motor Corp | Catalyst apparatus to be heated electrically |
| CN104775879A (en) * | 2014-01-14 | 2015-07-15 | 福特环球技术公司 | Methods for controlling nitrous oxide emissions |
| CN204783189U (en) * | 2015-06-02 | 2015-11-18 | 潍柴动力股份有限公司 | Hybrid bus after treatment system |
| CN106246301A (en) * | 2016-08-30 | 2016-12-21 | 潍柴动力股份有限公司 | A kind of exhaust temperature control system and control method |
| CN113464255A (en) * | 2021-08-03 | 2021-10-01 | 潍柴动力股份有限公司 | Method and device for detecting urea crystals, electronic device and computer storage medium |
| CN113653555A (en) * | 2021-09-03 | 2021-11-16 | 潍柴动力股份有限公司 | Method and device for removing crystal of SCR carrier box |
-
2022
- 2022-04-14 CN CN202210391938.5A patent/CN114718703A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08281122A (en) * | 1994-05-30 | 1996-10-29 | Toyota Motor Corp | Catalyst apparatus to be heated electrically |
| CN104775879A (en) * | 2014-01-14 | 2015-07-15 | 福特环球技术公司 | Methods for controlling nitrous oxide emissions |
| CN204783189U (en) * | 2015-06-02 | 2015-11-18 | 潍柴动力股份有限公司 | Hybrid bus after treatment system |
| CN106246301A (en) * | 2016-08-30 | 2016-12-21 | 潍柴动力股份有限公司 | A kind of exhaust temperature control system and control method |
| CN113464255A (en) * | 2021-08-03 | 2021-10-01 | 潍柴动力股份有限公司 | Method and device for detecting urea crystals, electronic device and computer storage medium |
| CN113653555A (en) * | 2021-09-03 | 2021-11-16 | 潍柴动力股份有限公司 | Method and device for removing crystal of SCR carrier box |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115263506A (en) * | 2022-08-17 | 2022-11-01 | 一汽解放汽车有限公司 | Engine postprocessor assembly |
| CN115263506B (en) * | 2022-08-17 | 2024-02-23 | 一汽解放汽车有限公司 | Engine post-processor assembly |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6859826B2 (en) | Plug-in hybrid vehicle | |
| EP1149232B1 (en) | Integrated apparatus for removing pollutants from a fluid stream in a lean-burn environment with heat recovery | |
| US10287939B2 (en) | Exhaust gas after-treatment unit for an internal combustion engine | |
| CN106401703A (en) | Tail gas purification system and tail gas purification method for diesel generator set | |
| CN114718703A (en) | Aftertreatment heating device and control strategy of hybrid electric vehicle | |
| CN105927326B (en) | Automatic regeneration device and regeneration method for DPF of marine diesel engine | |
| CN210289880U (en) | DPF/GPF (diesel particulate filter/general purpose filter) electric heating offline active regeneration system | |
| CN113513392A (en) | Active hot patching type aftertreatment system | |
| CN214660453U (en) | Double-catalyst tail gas treatment system | |
| KR20120036004A (en) | Exhaust gas reducing device for vehicles with burner to improve purification performance | |
| CN110617127B (en) | DOC rapid ignition heating device and method for diesel engine heat management system | |
| KR101664687B1 (en) | Device and method for controlling cooling fan of exhaust gas aftertreatment system | |
| CN211975126U (en) | Tail gas treatment system and engine | |
| KR20200095297A (en) | After treatment system and after treatment method for lean-burn engine | |
| CN215109092U (en) | Particulate filter heating device for diesel engine exhaust aftertreatment system | |
| CN212296578U (en) | Tail gas aftertreatment system with waste heat recovery device | |
| CN114312741A (en) | Method and system for performing engine thermal management based on P0 shallow mixing architecture | |
| KR100368034B1 (en) | Device for Reducing Diesel Exhaust Emission by Using Continuously Regenerative Plasma·Catalyst Hybrid System and method thereof | |
| CN112610308A (en) | Electric heating driven particle catcher | |
| CN217582275U (en) | Exhaust gas post-treatment system | |
| JP4132920B2 (en) | PM purification device | |
| CN114622970B (en) | Post-processing system of PNA coupled EHC and control method thereof | |
| JP2003222018A (en) | Exhaust emissions purification apparatus for internal combustion engine | |
| CN219509699U (en) | Electric heating exhaust aftertreatment device | |
| CN217233625U (en) | White smoke purifier for diesel engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220708 |