CN116906155A - Electric heating system for thermal management of vehicular SCR tail gas and electric heating control method - Google Patents
Electric heating system for thermal management of vehicular SCR tail gas and electric heating control method Download PDFInfo
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- CN116906155A CN116906155A CN202310782469.4A CN202310782469A CN116906155A CN 116906155 A CN116906155 A CN 116906155A CN 202310782469 A CN202310782469 A CN 202310782469A CN 116906155 A CN116906155 A CN 116906155A
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- 238000005485 electric heating Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000004202 carbamide Substances 0.000 claims abstract description 26
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000009423 ventilation Methods 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 230000009977 dual effect Effects 0.000 claims 1
- 239000003054 catalyst Substances 0.000 abstract description 17
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000002485 combustion reaction Methods 0.000 description 7
- 239000000446 fuel Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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
- 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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
-
- 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
-
- 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
-
- 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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses an electric heating system and an electric heating control method for thermal management of automobile SCR tail gas, wherein the electric heating control method controls the electric heating system, and the electric heating control method comprises the following steps: the vehicle-mounted computer monitors the exhaust flow, the vehicle speed, the ambient temperature, the post-treatment temperature, the urea temperature, the PTO, the brake, the clutch and the battery voltage, and controls the heating state of the EHC electrode through the electric heating relay switch according to the exhaust flow state, the vehicle speed state, the ambient temperature state, the post-treatment temperature state, the urea temperature state, the PTO state, the brake state, the clutch state and the battery voltage state. The electric heating control method can reach the temperature range of the optimal conversion efficiency of the SCR catalyst, thereby reducing NOx emission and further meeting the requirements of the emission regulations of the next stage.
Description
Technical Field
The invention relates to the field of post-treatment of engine emission, in particular to an electric heating system and an electric heating control method for thermal management of automobile SCR tail gas.
Background
With gradual tightening of emission regulations of mobile source vehicles, the technical route of DOC (diesel oxidation catalyst) +DPF (diesel particulate filter) +SCR (selective catalytic reduction device) +ASC (ammonia oxidation catalyst) of a state six-stage aftertreatment scheme cannot meet future regulation requirements, and in order to meet emission regulation limit values of cold state circulation and low-load LLC circulation of the future regulations, the state six aftertreatment engine body at the current stage of NOx 'near zero emission' required by the future regulations cannot be thermally managed, and an electric heating device is required to be additionally arranged at the front stage of the state six aftertreatment DOC+DPF+SCR+ASC, as shown in fig. 1. The heat management of the engine body can not quickly heat the SCR catalyst in the WHTC cold state circulation, the temperature of the SCR catalyst in the WHTC circulation and the LLC circulation is quickly increased after the electric heating device is additionally arranged, and the optimal conversion efficiency temperature interval of the SCR catalyst is reached, so that NOx emission is reduced, the emission regulation of the next stage is met, and the following application problems are needed to be solved:
1: exhaust temperature management control in cold start stage, when the exhaust temperature is lower than a set value, the electric heating is started, the temperature of the catalyst is set to be too low, the emission is not up to the standard in an efficient area, and when the exhaust temperature is higher than a set value, the heating of the pipe is closed, the temperature is set to be too high, and the oil consumption is seriously deteriorated
2: when the exhaust flow is lower than a certain value, the electric heating wire is easily burnt out due to the fact that the temperature of the electric heating wire is too high.
3: when the ambient temperature and the urea temperature are lower than a certain value, the urea solution is in a solid state, the temperature of the SCR catalyst reaches a high-efficiency area, no liquid urea enters the catalyst, NOx cannot be converted, and the engine oil consumption is easily deteriorated due to the fact that electric heating is started.
4: when the voltage supplied to the electric heating wire is too high, the electric heating wire current is easy to cause over-rated current, the heating wire is burnt, when the voltage is too low, the electric heating is started, and other electric parts of the vehicle are easy to cause to fail to work normally, and the like.
Means of the method for raising the post-treatment temperature at the present stage:
exhaust gas recirculation (exhaust gas recirculation, EGR), intake throttling, fuel post injection, and the like.
The method for raising the exhaust temperature of the EGR valve comprises the following steps: the air-fuel ratio in the combustion chamber of the engine is reduced, the temperature in the combustion chamber is reduced, the combustion efficiency is reduced, and the exhaust temperature is increased.
The method for throttle valve air inlet throttling lifting temperature discharge comprises the following steps: the air-fuel ratio of the fresh intake air amount in the engine burner and thus the combustion efficiency is lowered, and the exhaust temperature is raised.
The method for raising the temperature of the discharged fuel oil by post injection comprises the following steps: part of fuel is combusted in the post-combustion period, so that the combustion efficiency of the fuel in the combustion chamber is reduced, and the exhaust temperature of the engine is improved.
The technical requirements of the emission regulation of the current stage on the cold state circulation and the low load circulation are not met, the temperature of the bed body of the SCR catalyst cannot reach the efficiency window of the catalyst in the first 600s of the cold state circulation under the single-stage injection low load circulation, the SCR catalyst cannot convert NOx pollutants into harmless N2 in the first 600s of the cold state circulation, and the thermal management scheme of the current stage cannot meet the technical requirements of the exhaust thermal management of the cold state circulation and the low load circulation of the future regulation.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide an electric heating system and an electric heating control method for thermal management of automobile SCR tail gas, which can reach the optimal conversion efficiency temperature range of an SCR catalyst, thereby reducing NOx emission and further meeting the requirements of emission regulations of the next stage.
In order to achieve the above purpose, the invention provides an electric heating system for thermal management of vehicular SCR tail gas, which is integrated in ccSCR of a device for reducing NOx by vehicular SCR double-stage urea injection, and comprises a T8 temperature sensor, a T9 temperature sensor, an EHC electrode and an electric heating relay switch; the T8 temperature sensor is arranged at the inlet of the SCR and positioned at the rear of the urea nozzle, and the T8 temperature sensor is used for monitoring the temperature at the urea nozzle; the T9 temperature sensor is arranged at the SCR outlet and used for monitoring the temperature at the SCR outlet; an EHC electrode is disposed at the SCR inlet and forward of the urea nozzle, the EHC electrode for heating the ccSCR; the electric heating relay switch is electrically connected with the EHC electrode.
In a preferred embodiment the T8 temperature sensor is 50mm from the front end of the mixer of the SCR and the T9 temperature sensor is 50mm from the rear end of the mixer of the SCR.
In a preferred embodiment the depth of insertion of the EHC electrode into the SCR is between 50 and 90 mm.
In a preferred embodiment, the electrically heated relay switch controls the heating state of the EHC electrode based on the exhaust flow state, the vehicle speed state, the ambient temperature state, the aftertreatment temperature state, the urea temperature state, the PTO state, the braking state, the clutch state, and the battery voltage state.
In order to achieve the above object, the present invention provides an electrical heating control method for thermal management of SCR exhaust gas for a vehicle, which is controlled by an electrical heating system as described above, the electrical heating control method comprising: the vehicle-mounted computer monitors the exhaust flow, the vehicle speed, the ambient temperature, the post-treatment temperature, the urea temperature, the PTO, the brake, the clutch and the battery voltage, and controls the heating state of the EHC electrode through the electric heating relay switch according to the exhaust flow state, the vehicle speed state, the ambient temperature state, the post-treatment temperature state, the urea temperature state, the PTO state, the brake state, the clutch state and the battery voltage state.
In a preferred embodiment, the electric heating control method further includes that the EHC electrode generates heat in total when the EHC electrode satisfies the target temperature, and derives a rated power value of the EHC motor according to a basic formula of p=q/t; wherein Q refers to the total heat required to be generated by the EHC electrode, t refers to the heating time, and P refers to the electric heating power value.
In a preferred embodiment the EHC electrode is required to meet a target temperature of 250 ° and the time for the EHC electrode to reach the target temperature is within 0 to 300 s.
In a preferred embodiment the heat generated by the EHC electrodes is primarily used for the endothermic demand of the EHC carrier, the elevated ventilation air temperature demand, and other heat losses, wherein:
heat absorption requirement q1=c of EHC carrier ehc m ehc ΔT；
Elevated ventilation air temperature requirement q2=c Exhaust gas q tΔT；
P＝(Q1+Q2+Q3)/t；
Wherein Q3 refers to other heat loss, C ehc Refers to the specific heat capacity, m of the EHC carrier ehc Refers to the weight of the electric heating carrier, delta T refers to the temperature rise value, C Exhaust gas The specific heat capacity of engine exhaust gas is indicated, q is the flow rate of engine exhaust gas, t is the heating time, and P is the electric heating power value.
Compared with the prior art, the electric heating system and the electric heating control method for the thermal management of the automobile SCR tail gas have the following beneficial effects: the temperature of the SCR catalyst of the WHTC cycle and the LLC cycle is quickly increased after the electric heating device is additionally arranged, so that the optimal conversion efficiency temperature interval of the SCR catalyst can be achieved, NOx emission is reduced, and the requirements of emission regulations of the next stage are further met.
Drawings
FIG. 1 is a schematic diagram of an exhaust heat pipe according to an embodiment of the prior art;
FIG. 2 is a schematic diagram of an exhaust heat pipe according to an embodiment of the present invention;
FIG. 3 is an enlarged schematic view of an electrical heating system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of the control principle of an electric heating system according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.
As shown in fig. 2 to 3, an electrical heating system for thermal management of SCR exhaust gas for a vehicle according to a preferred embodiment of the present invention is integrated in ccSCR of a dual-stage urea injection NOx reduction device for a vehicle, and the electrical heating system includes a T8 temperature sensor, a T9 temperature sensor, an EHC electrode of the electrical heating system, and an electrical heating relay switch; the T8 temperature sensor is arranged at the inlet of the SCR and positioned at the rear of the urea nozzle, and the T8 temperature sensor is used for monitoring the temperature at the urea nozzle; the T9 temperature sensor is arranged at the SCR outlet and used for monitoring the temperature at the SCR outlet; an EHC electrode is disposed at the SCR inlet and forward of the urea nozzle, the EHC electrode for heating the ccSCR; the electric heating relay switch is electrically connected with the EHC electrode.
In some embodiments, the T8 temperature sensor is 50mm from the front end of the mixer of the SCR and the T9 temperature sensor is 50mm from the rear end of the mixer of the SCR.
In some embodiments, the depth to which the EHC electrode is inserted into the SCR is between 50 and 90 mm.
In some embodiments, the electrically heated relay switch controls the heating state of the EHC electrode based on the exhaust flow state, the vehicle speed state, the ambient temperature state, the aftertreatment temperature state, the urea temperature state, the PTO state, the braking state, the clutch state, and the battery voltage state.
As shown in fig. 4, an electrical heating control method for thermal management of SCR exhaust gas for a vehicle according to a preferred embodiment of the present invention, which is controlled by an electrical heating system as described above, includes: the vehicle-mounted computer monitors the exhaust flow, the vehicle speed, the ambient temperature, the post-treatment temperature, the urea temperature, the PTO, the brake, the clutch and the battery voltage, and controls the heating state of the EHC electrode through the electric heating relay switch according to the exhaust flow state, the vehicle speed state, the ambient temperature state, the post-treatment temperature state, the urea temperature state, the PTO state, the brake state, the clutch state and the battery voltage state.
In some embodiments, the electric heating control method further includes the EHC electrode generating heat in total when the EHC electrode satisfies the target temperature, deriving a rated power value of the EHC motor according to a basic formula of p=q/t; wherein Q refers to the total heat required to be generated by the EHC electrode, t refers to the heating time, and P refers to the electric heating power value.
In some embodiments, the EHC electrode is required to meet a target temperature of 250 ° and the time for the EHC electrode to reach the target temperature is within 0-300 s.
In some embodiments, the heat generated by the EHC electrode is primarily used for the heat absorption needs of the EHC carrier, the elevated ventilation air temperature needs, and other heat losses, where:
heat absorption requirement q1=c of EHC carrier ehc m ehc ΔT；
Elevated ventilation air temperature requirement q2=c Exhaust gas q tΔT；
P＝(Q1+Q2+Q3)/t；
Wherein Q3 refers to other heat loss, C ehc Refers to the specific heat capacity, m of the EHC carrier ehc Refers to the weight of the electric heating carrier, delta T refers to the temperature rise value, C Exhaust gas The specific heat capacity of engine exhaust gas is indicated, q is the flow rate of engine exhaust gas, t is the heating time, and P is the electric heating power value.
In summary, the electric heating system and the electric heating control method for the thermal management of the vehicular SCR tail gas have the following beneficial effects: the temperature of the SCR catalyst of the WHTC cycle and the LLC cycle is quickly increased after the electric heating device is additionally arranged, so that the optimal conversion efficiency temperature interval of the SCR catalyst can be achieved, NOx emission is reduced, and the requirements of emission regulations of the next stage are further met.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (8)
1. An electrical heating system for thermal management of vehicular SCR exhaust gas integrated within ccSCR of a device for reducing NOx by vehicular SCR dual stage urea injection, the electrical heating system comprising:
a T8 temperature sensor disposed at the SCR inlet and rearward of the urea nozzle, the T8 temperature sensor to monitor the temperature at the urea nozzle;
a T9 temperature sensor disposed at the SCR outlet for monitoring a temperature at the SCR outlet;
an EHC electrode disposed at the SCR inlet and forward of the urea nozzle, the EHC electrode for heating within the ccSCR; and
and an electrically heated relay switch electrically connected to the EHC electrode.
2. The electrical heating system of claim 1, wherein the T8 temperature sensor is 50mm from a front end of the SCR mixer and the T9 temperature sensor is 50mm from a rear end of the SCR mixer.
3. The electrical heating system of claim 1, wherein the EHC electrode is inserted into the SCR interior to a depth of between 50 and 90 mm.
4. The electric heating system of claim 1, wherein the electric heating relay switch controls the heating state of the EHC electrode based on an exhaust flow state, a vehicle speed state, an ambient temperature state, an aftertreatment temperature state, a urea temperature state, a PTO state, a braking state, a clutching state, and a battery voltage state.
5. An electric heating control method of heat management of vehicular SCR exhaust gas, which is controlled by the electric heating system according to any one of claims 1 to 4, characterized in that the electric heating control method comprises: the vehicle-mounted computer monitors the exhaust flow, the vehicle speed, the ambient temperature, the post-treatment temperature, the urea temperature, the PTO, the brake, the clutch and the battery voltage, and controls the heating state of the EHC electrode through the electric heating relay switch according to the exhaust flow state, the vehicle speed state, the ambient temperature state, the post-treatment temperature state, the urea temperature state, the PTO state, the brake state, the clutch state and the battery voltage state.
6. The electric heating control method according to claim 5, further comprising deriving a rated power value of the EHC motor from a basic formula of p=q/t for a total amount of heat to be generated by the EHC electrode in the case where the EHC electrode satisfies a target temperature; wherein Q refers to the total heat required to be generated by the EHC electrode, t refers to the heating time, and P refers to the electric heating power value.
7. The electric heating control method according to claim 6, wherein the target temperature that the EHC electrode needs to meet is 250 °, and the time for the EHC electrode to reach the target temperature is within 0 to 300 s.
8. The electrical heating control method of claim 6, wherein the heat generated by the EHC electrode is primarily used for heat absorption requirements of the EHC carrier, elevated ventilation air temperature requirements, and other heat losses, wherein:
heat absorption requirement q1=c of EHC carrier ehc m ehc ΔT；
Elevated ventilation air temperature requirement q2=c Exhaust gas q tΔT；
P＝(Q1+Q2+Q3)/t；
Wherein Q3 refers to other heat loss, C ehc Refers to the specific heat capacity, m of the EHC carrier ehc Refers to the weight of the electric heating carrier, delta T refers to the temperature rise value, C Exhaust gas Refer to the specific heat capacity of engine exhaust, q refers to engineThe exhaust flow, t is the heating time, and P is the electric heating power value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310782469.4A CN116906155A (en) | 2023-06-29 | 2023-06-29 | Electric heating system for thermal management of vehicular SCR tail gas and electric heating control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310782469.4A CN116906155A (en) | 2023-06-29 | 2023-06-29 | Electric heating system for thermal management of vehicular SCR tail gas and electric heating control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116906155A true CN116906155A (en) | 2023-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310782469.4A Pending CN116906155A (en) | 2023-06-29 | 2023-06-29 | Electric heating system for thermal management of vehicular SCR tail gas and electric heating control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116906155A (en) |
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2023
- 2023-06-29 CN CN202310782469.4A patent/CN116906155A/en active Pending
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