CN219733494U - Dual injection system and vehicle - Google Patents
Dual injection system and vehicle Download PDFInfo
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- CN219733494U CN219733494U CN202320260918.4U CN202320260918U CN219733494U CN 219733494 U CN219733494 U CN 219733494U CN 202320260918 U CN202320260918 U CN 202320260918U CN 219733494 U CN219733494 U CN 219733494U
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- 238000002347 injection Methods 0.000 title claims abstract description 127
- 239000007924 injection Substances 0.000 title claims abstract description 127
- 230000009977 dual effect Effects 0.000 title claims description 14
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 223
- 239000004202 carbamide Substances 0.000 claims abstract description 211
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 206
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 103
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 238000005507 spraying Methods 0.000 claims abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 90
- 230000000087 stabilizing effect Effects 0.000 claims description 17
- 239000007789 gas Substances 0.000 claims description 11
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 claims description 10
- 238000002425 crystallisation Methods 0.000 abstract description 15
- 230000008025 crystallization Effects 0.000 abstract description 15
- 230000001276 controlling effect Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000007062 hydrolysis Effects 0.000 description 4
- 238000006460 hydrolysis reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Exhaust Gas After Treatment (AREA)
Abstract
The utility model provides a double-injection system and a vehicle, wherein the system comprises a urea injection subsystem, an ammonia injection subsystem and a controller ECU; the urea injection subsystem comprises a urea pump and a urea nozzle, and an outlet of the urea pump is connected with the urea nozzle; the ammonia spraying subsystem comprises a reactor and an ammonia nozzle, and the reactor is connected to an outlet of the urea pump and is used for receiving urea conveyed by the urea pump to perform chemical reaction to generate ammonia; the ammonia gas nozzle is connected with the reactor; the ECU is connected with the urea injection subsystem and the ammonia injection subsystem and is used for controlling the ammonia injection subsystem to inject ammonia when the exhaust temperature obtained by the ECU is smaller than a preset threshold value and controlling the urea injection subsystem to inject urea when the exhaust temperature is larger than or equal to the preset threshold value. According to the scheme, the ammonia injection subsystem and the urea injection subsystem are arranged, the ECU switches between the two subsystems according to the exhaust temperature, the problem of urea crystallization is solved, and the failure rate caused by urea crystallization is reduced.
Description
Technical Field
The utility model relates to the technical field of automobile exhaust treatment, in particular to a double-injection system and a vehicle.
Background
With the increasing strictness of environmental protection laws, the requirements on vehicle exhaust emission are more and more strict.
In the related art, in order to control the content of nitrogen oxides in the tail gas of a vehicle, a post-treatment system using urea solution as a reducing agent is adopted, urea is hydrolyzed in a high-temperature environment by injecting the urea solution into an exhaust pipe to generate ammonia and carbon dioxide, and the ammonia reacts with the nitrogen oxides to reduce the ammonia and the carbon dioxide into harmless nitrogen and water. However, at exhaust temperatures below 180 ℃, urea solutions are prone to white crystallization and urea crystallization is prone to failure of the urea system.
Therefore, how to prevent urea crystallization and reduce the failure rate caused by urea crystallization is a problem to be solved.
It should be noted that the information disclosed in the foregoing background section is only for enhancement of understanding of the background of the utility model and thus may include, but does not constitute, information from the prior art that is already known to those of ordinary skill in the art.
Disclosure of Invention
The utility model provides a double-injection system and a vehicle, wherein the system can effectively prevent urea from crystallizing and reduce the failure rate caused by urea crystallization.
In a first aspect, a dual injection system is provided, the system comprising a urea injection subsystem, an ammonia injection subsystem, and a controller (Electronic Control Unit, ECU);
the urea injection subsystem comprises a urea pump and a urea nozzle, and an outlet of the urea pump is connected with the urea nozzle;
the ammonia spraying subsystem comprises a reactor and an ammonia nozzle, and the reactor is connected to an outlet of the urea pump and is used for receiving urea conveyed by the urea pump to perform chemical reaction to generate ammonia; the ammonia gas nozzle is connected with the reactor;
the ECU is connected with the urea injection subsystem and the ammonia injection subsystem and is used for controlling the ammonia injection subsystem to inject ammonia when the exhaust temperature obtained by the ECU is smaller than a preset threshold value and controlling the urea injection subsystem to inject urea when the exhaust temperature is larger than or equal to the preset threshold value.
In the technical scheme, the ammonia injection subsystem and the urea injection subsystem are arranged, the ECU switches between the two subsystems according to the exhaust temperature, so that the problem of crystallization of the urea system in a diesel vehicle type is solved, and meanwhile, the failure rate caused by urea crystallization is effectively reduced.
With reference to the first aspect, in some possible implementations, the ammonia injection subsystem further includes a urea injector mounted on the reactor for injecting urea into the reactor.
With reference to the first aspect and the foregoing implementation manner, in some possible implementation manners, the ammonia injection subsystem further includes a pressure reducing valve and a pressure stabilizing tank; one end of the pressure reducing valve is connected with the reactor, and the other end of the pressure reducing valve is connected with the pressure stabilizing box; the ECU is connected with the pressure reducing valve and used for controlling the opening degree of the pressure reducing valve to enable the pressure value of the pressure stabilizing box to be increased when the pressure value of the pressure stabilizing box is smaller than a preset pressure value prestored by the ECU.
With reference to the first aspect and the foregoing implementation manner, in some possible implementation manners, the ammonia injection subsystem further includes a shutoff valve; the shutoff valve is arranged between the pressure reducing valve and the pressure stabilizing box; the ECU is connected with the shutoff valve and is used for controlling the shutoff valve to be closed when the pressure value of the pressure stabilizing box is larger than a preset pressure value.
In the technical scheme, the ECU controls the pressure reducing valve and the shutoff valve according to the pressure value of the surge tank, so that the pressure value of the surge tank can be always kept stable.
With reference to the first aspect and the foregoing implementation manner, in some possible implementation manners, the ammonia gas injection subsystem further includes a pressure sensor; the pressure sensor is arranged on the pressure stabilizing box and is used for measuring the pressure value of the pressure stabilizing box; the pressure sensor is also connected to the ECU for sending the pressure value to the ECU.
With reference to the first aspect and the foregoing implementation manner, in some possible implementation manners, the system further includes a post-processor, where the post-processor is connected to the ammonia nozzle and the urea nozzle, and is configured to receive ammonia injected by the ammonia nozzle or urea injected by the urea nozzle to treat the exhaust gas.
With reference to the first aspect and the foregoing implementation manner, in some possible implementation manners, the system further includes a nitrogen-oxygen sensor and a temperature discharge sensor; the nitrogen-oxygen sensor is arranged on the post-processor and is used for measuring the concentration of nitrogen oxides in the exhaust gas; the nitrogen-oxygen sensor is also connected with the ECU and is used for sending the concentration of the nitrogen oxides to the ECU; the exhaust temperature sensor is arranged on the post processor and is used for measuring the exhaust temperature; the exhaust temperature sensor is also connected with the ECU and used for sending exhaust temperature to the ECU; the ECU calculates an ammonia injection amount or a urea injection amount based on the nitrogen oxide concentration, the exhaust gas temperature, and the nitrogen oxide conversion rate.
In the technical scheme, the nitrogen oxide concentration is measured through the nitrogen-oxygen sensor, the exhaust temperature is measured through the exhaust temperature sensor, and the ECU calculates the ammonia or urea injection amount according to the nitrogen oxide concentration value, the exhaust temperature and the nitrogen oxide conversion rate, so that the injection amount of ammonia or urea can be effectively controlled, the exhaust emission reaches the emission standard, and the waste of ammonia or urea is avoided.
With reference to the first aspect and the foregoing implementation manners, in some possible implementation manners, the system further includes a urea injection control unit (Dosing Control Unit, DCU); the DCU is connected with the ECU and is used for receiving the ammonia injection quantity and the urea injection quantity sent by the ECU; the DCU is also connected with the urea nozzle and used for controlling the opening and closing of the urea nozzle based on the urea injection quantity; the DCU is also connected with the ammonia nozzle and used for controlling the opening and closing of the ammonia nozzle based on the ammonia injection quantity.
With reference to the first aspect and the foregoing implementation manner, in some possible implementation manners, the DCU is further connected to a urea pump, and is configured to control a rotational speed of the urea pump, so as to control an injection amount of urea; the DCU is also connected with the urea injector and used for controlling the opening and closing of the urea injector.
Through the technical scheme, the DCU controls the rotating speed of the urea pump to control the pressure in the urea pipeline, so that the injection quantity of urea is controlled, and ammonia can be always maintained at a certain concentration.
In a second aspect, there is provided a vehicle comprising the first aspect or any one of the possible systems of the first aspect.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model. It is evident that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a dual injection system according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of an ammonia injection subsystem according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of another dual injection system according to an embodiment of the present utility model;
fig. 4 is a flowchart of a control method of a dual injection system according to an embodiment of the present utility model.
Reference numerals: 1-a dual injection system; 10-urea injection subsystem; 11-an ammonia injection subsystem; 12-ECU; 13-urea tank; 14-a post-processor; 15-nitrogen-oxygen sensor; 16-a temperature discharge sensor; 17-DCU; 101-urea pump; 102-urea nozzle; a 111-reactor; 112-ammonia gas nozzle; 113-a pressure reducing valve; 114-a shut-off valve; 115-a surge tank; 116-pressure sensor; 117-urea syringe.
Detailed Description
The technical scheme of the utility model will be clearly and thoroughly described below with reference to the accompanying drawings. Wherein, in the description of the embodiments of the present utility model, unless otherwise indicated, "/" means or, for example, a/B may represent a or B: the text "and/or" is merely an association relation describing the associated object, and indicates that three relations may exist, for example, a and/or B may indicate: the three cases where a exists alone, a and B exist together, and B exists alone, and furthermore, in the description of the embodiments of the present utility model, "plural" means two or more than two.
The terms "first," "second," and the like, are used below for descriptive purposes only and are not to be construed as implying or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
Fig. 1 is a schematic structural diagram of a dual injection system according to an embodiment of the present utility model.
As shown in fig. 1, the dual injection system 1 provided in the embodiment of the present utility model includes a urea injection subsystem 10, an ammonia injection subsystem 11, and an ECU12.
In an exemplary embodiment, urea injection subsystem 10 includes: urea pump 101, urea nozzle 102. The urea pump 101 is installed in a urea box, standard vehicle urea liquid is stored in the urea box, an outlet of the urea pump 101 is connected to the urea nozzle 102, and the urea pump 101 is pressurized and then conveys the urea liquid to the urea nozzle 102 through a urea pipe.
The ammonia injection subsystem 11 comprises: a reactor 111 and an ammonia gas nozzle 112. One end of the reactor 111 is connected to the outlet of the urea pump 102, and the other end is connected to the ammonia nozzle 112, and a urea hydrolysis catalyst is built in the reactor, wherein the pressure and the temperature required by urea hydrolysis are maintained, and the reactor is used for receiving urea conveyed by the urea pump 101 and performing chemical reaction to generate ammonia. An ammonia gas nozzle 112 is connected to the reactor 111 for receiving ammonia gas generated by the reactor 111 and injecting the ammonia gas.
The ECU12 is connected to the urea injection subsystem 10 and the ammonia injection subsystem 11, and is configured to control the ammonia injection subsystem 11 to inject ammonia when the exhaust temperature in the exhaust pipe is less than a preset threshold (200 ℃), and to control the urea injection subsystem 10 to inject urea when the exhaust temperature is greater than or equal to the preset threshold. During vehicle operation, the ECU12 switches between the urea injection subsystem 10 and the ammonia injection subsystem 11 according to the vehicle operating state and the exhaust temperature, so as to convert the automobile exhaust.
Through the technical scheme, the double-injection system comprises the ammonia injection subsystem and the urea injection subsystem, and the ECU is switched before the urea injection subsystem and the ammonia injection subsystem according to the exhaust temperature, so that urea crystallization can be effectively solved, and the failure rate caused by urea crystallization is reduced.
Fig. 2 is a schematic structural diagram of an ammonia injection subsystem according to an embodiment of the present utility model.
As shown in fig. 2, in the exemplary embodiment, ammonia injection subsystem 11 also includes a urea injector 117 mounted on reactor 111 and coupled to urea pump 101 for receiving urea delivered by the urea pump and injecting urea into reactor 111.
In the exemplary embodiment, ammonia injection subsystem 11 also includes a pressure relief valve 113 and a surge tank 115, with one end of pressure relief valve 113 connected to reactor 111 and the other end connected to surge tank 115. After the urea is hydrolyzed in the reactor 111 to generate ammonia, the pressure value is increased, and the ammonia is depressurized through a depressurization valve 113 to enter a surge tank 115.
In an example embodiment, the ammonia injection subsystem 11 further includes a shut-off valve 114 mounted between the pressure reducing valve 113 and the surge tank 115 for regulating the pressure value of the surge tank 115.
In the exemplary embodiment, ammonia injection subsystem 11 also includes a pressure sensor 116 mounted to surge tank 115 for measuring a pressure value of surge tank 115.
FIG. 3 is a schematic diagram of another dual injection system according to an embodiment of the present utility model.
As shown in fig. 3, the dual injection system 1 includes: urea tank 13, urea pump 101, urea injector 117, reactor 111, pressure reducing valve 113, shutoff valve 114, surge tank 115, pressure sensor 116, ammonia gas nozzle 112, post-processor 14, urea nozzle 102, nitrogen oxygen sensor 15, exhaust temperature sensor 16, ecu12, dcu17.
In an exemplary embodiment, the urea pump 101 is installed in the urea tank 13, the urea tank 13 stores standard vehicle urea solution therein, and the urea pump 101 delivers urea in the urea tank 13 into the urea pipe and maintains a certain pressure according to a signal sent from the DCU17. The outlet of the urea pump 101 is connected to a urea injector 117 for delivering urea to the urea injector; the outlet of the urea pump 101 is also connected to the urea nozzle 102, and urea liquid is delivered to the urea nozzle 102 through a urea pipe after being pressurized by the urea pump 101.
One end of the reactor 111 is connected to the outlet of the urea pump 101, and the other end is connected to the pressure reducing valve 113, and a urea hydrolysis catalyst is built in the reactor, wherein the pressure and the temperature required by urea hydrolysis are maintained, and the reactor is used for receiving urea conveyed by the urea pump 101 and carrying out chemical reaction to generate ammonia.
A urea injector 117 is installed on the reactor 111 and connected to the urea pump 101 for receiving urea delivered by the urea pump 101 and injecting urea into the reactor 111; the urea syringe is also connected to the DCU17.
A pressure reducing valve 113 has one end connected to the reactor 111 and the other end connected to a shutoff valve 114.
One end of the shutoff valve 114 is connected to the pressure reducing valve 113, the other end is connected to the pressure stabilizing tank 115, the pressure value of urea rises after the urea is hydrolyzed in the reactor 111 to generate ammonia gas, and the ammonia gas is decompressed by the pressure reducing valve 113 and enters the pressure stabilizing tank 115.
One end of the surge tank 115 is connected to the shutoff valve 114, and the other end is connected to the ammonia gas nozzle 112.
A pressure sensor 116 is installed on the surge tank 115 for measuring a pressure value of the surge tank 115. The pressure sensor 116 is also connected to the ECU12 for sending the pressure value of the surge tank 115 to the ECU12.
The pressure reducing valve 113, the shutoff valve 114 and the pressure sensor 116 are also connected to the ECU12, a preset pressure value is preset in the ECU12 and is stored in a storage medium, the ECU12 compares the preset pressure value with a measured pressure value of the pressure sensor 116 according to the running condition of the engine, and if the pressure value of the surge tank 115 is larger than the preset pressure value, the shutoff valve 114 is controlled to be closed; if the pressure value is smaller than the preset pressure value, the opening of the relief valve 113 is adjusted to raise the pressure value of the surge tank 115, and the pressure of the surge tank 115 is made to coincide with the preset pressure value by controlling the relief valve 113 and the shutoff valve 114.
Through the technical scheme in the above example embodiment, the ECU controls the pressure reducing valve and the shutoff valve according to the pressure value of the surge tank, so that the pressure value of the surge tank can be kept stable all the time.
An ammonia nozzle 112 and urea nozzle 102 are mounted on aftertreatment device 14 for injecting ammonia and urea into aftertreatment device 14. The post-processor 14 is configured to receive ammonia or urea injected from the ammonia nozzle 112 or the urea nozzle 102 and treat the exhaust gas.
A nitrogen-oxygen sensor 15 is mounted on the aftertreatment device 14 and connected to the ECU12 for measuring a nitrogen oxide concentration value in the exhaust gas, and transmitting the nitrogen oxide concentration value to the ECU12.
An exhaust temperature sensor 16 is mounted on the aftertreatment device 14 and is connected to the ECU12 for measuring the exhaust temperature and transmitting the exhaust temperature value to the ECU12.
The ECU12 calculates an injection amount of ammonia or urea based on the exhaust gas temperature, the nitrogen oxide concentration, and the nitrogen oxide conversion rate requirements, and sends the injection amount information to the DCU17.
Through the technical scheme in the above-mentioned example embodiment, through nitrogen oxide concentration measurement of nitrogen oxide sensor, exhaust temperature measurement of exhaust temperature sensor, ECU calculate ammonia or urea injection according to nitrogen oxide concentration value and exhaust temperature and nitrogen oxide conversion rate, can effectively control ammonia or urea's injection, make exhaust emission reach emission standard, avoid causing the waste of ammonia or urea.
DCU17 is connected to urea pump 101, urea injector 117, ammonia nozzle 112, urea nozzle 102, ECU12, respectively. The DCU17 controls the pressure in the urea pipe by controlling the rotational speed of the urea pump 101, thereby controlling the injection amount of urea. The amount of urea injected into the reactor 111 is controlled by controlling the opening and closing of the urea injector 117 and the duration of time, so that the concentration of the hydrolyzed ammonia gas is always maintained at a constant level. The DCU17 controls the opening and closing of the ammonia nozzle 112 or the urea nozzle 102 according to the ammonia or urea injection amount information sent by the ECU12, and injects ammonia or urea into the post-processor 14 to reduce nitrogen oxides in the exhaust gas into nitrogen and water through oxidation-reduction reaction.
Through the technical scheme, the DCU controls the rotating speed of the urea pump to control the pressure in the urea pipeline, so that the injection quantity of urea is controlled, and ammonia can be always maintained at a certain concentration.
In summary, through the technical scheme of the utility model, the ammonia injection subsystem and the urea injection subsystem are arranged, the ECU switches between the two subsystems according to the exhaust temperature, so that the problem of crystallization of the urea system in the diesel vehicle type is solved, and the failure rate caused by urea crystallization is effectively reduced. The ammonia injection subsystem further comprises a pressure reducing valve and a shutoff valve, so that the pressure value of the pressure stabilizing box can be always kept stable. Meanwhile, the nitrogen oxide concentration is measured through the nitrogen-oxygen sensor, the exhaust temperature is measured through the exhaust temperature sensor, the ECU calculates the ammonia or urea injection quantity according to the nitrogen oxide concentration value, the exhaust temperature and the nitrogen oxide conversion rate, the injection quantity of the ammonia or urea can be effectively controlled, the exhaust emission standard is reached, and the waste of the ammonia or urea is avoided. The DCU controls the rotating speed of the urea pump to control the pressure in the urea pipeline, so that the injection quantity of urea is controlled, and the ammonia can be always maintained at a certain concentration.
Fig. 4 is a flowchart of a control method of a dual injection system according to an embodiment of the present utility model. The control method in the exemplary embodiment is described in detail below with reference to fig. 4.
Step S401, monitoring a vehicle running state.
In an example embodiment, the ECU monitors vehicle operating conditions in real time during vehicle travel, including cold start conditions, idle conditions, and normal travel conditions.
Step S402, determining a vehicle running state.
Step S403, under the cold start condition, step S404 is executed.
Step S404, the ammonia injection subsystem is started, and the urea injection subsystem is closed.
In an example embodiment, under a cold start condition, after the engine is ignited, the temperature in the post-processor is low at the moment, and if urea is injected, crystallization is easy to occur; the ECU controls the ammonia injection subsystem to work, ammonia is injected into the post-processor, and the nitrogen oxide emission of the diesel vehicle is reduced through the ammonia.
Step S405, under the idle condition, step S407 is executed.
Step S406 is executed in step S407 under the normal driving condition.
Step S407, switching between the urea injection subsystem and the ammonia injection subsystem according to the exhaust temperature detected by the exhaust temperature sensor.
In an example embodiment, under an idle working condition, the ECU monitors the exhaust temperature of the post-processor, and when the exhaust temperature is less than 200 ℃, the ECU controls the ammonia injection subsystem to work, reduces the emission of nitrogen oxides of the diesel vehicle through ammonia, and simultaneously controls the urea injection subsystem to build pressure and enter a waiting injection state; when the exhaust temperature is higher than 200 ℃, the ammonia injection subsystem stops working, the urea injection subsystem starts working, urea is injected into the post-processor, and the emission of nitrogen oxides of the diesel vehicle is reduced through the urea; switching between the urea injection subsystem and the ammonia injection subsystem is performed based on the exhaust temperature.
Under normal running conditions, after the state judgment is completed, the ECU monitors the exhaust temperature of the post-processor, when the exhaust temperature is lower than 200 ℃, the ECU controls the ammonia injection subsystem to work, reduces the emission of nitrogen oxides of the diesel vehicle through ammonia, and simultaneously controls the urea injection subsystem to build pressure and enter a waiting injection state; when the exhaust temperature is higher than 200 ℃, the ammonia injection subsystem stops working, the urea injection subsystem starts working, urea is injected into the post-processor, and the emission of nitrogen oxides of the diesel vehicle is reduced through the urea. And switching between urea subsystem injection and ammonia injection subsystems based on exhaust temperature.
Through the technical scheme in the above-mentioned example embodiment, firstly judge the vehicle running state, select ammonia injection subsystem and urea injection subsystem based on vehicle running state and exhaust temperature, effectively reduce the fault rate that urea crystallization arouses.
In one possible implementation, when one of the urea injection subsystem or the ammonia injection subsystem fails, the ECU controls the other subsystem to work, so that the emission of the vehicle is prevented from exceeding the standard, and meanwhile, fault early warning is carried out to remind a customer of maintenance.
In the technical scheme, when one subsystem fails, the other subsystem is switched to work, so that the excessive emission of the tail gas of the vehicle can be effectively avoided, and the robustness of the urea system is improved.
In the embodiments provided in the present utility model, it should be understood that the disclosed system and method may be implemented in other manners. For example, the system embodiments described above are merely illustrative, e.g., the division of modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.
Claims (10)
1. A dual injection system, characterized in that the dual injection system comprises a urea injection subsystem, an ammonia injection subsystem and a controller ECU;
the urea injection subsystem comprises a urea pump and a urea nozzle, and an outlet of the urea pump is connected with the urea nozzle;
the ammonia spraying subsystem comprises a reactor and an ammonia nozzle, wherein the reactor is connected to an outlet of the urea pump and is used for receiving urea conveyed by the urea pump to perform chemical reaction to generate ammonia; the ammonia gas nozzle is connected with the reactor;
the ECU is connected with the urea injection subsystem and the ammonia injection subsystem and is used for controlling the ammonia injection subsystem to inject ammonia when the exhaust temperature obtained by the ECU is smaller than a preset threshold value and controlling the urea subsystem to inject urea when the exhaust temperature is larger than or equal to the preset threshold value.
2. The system of claim 1, wherein the ammonia injection subsystem further comprises a urea injector mounted on the reactor for injecting urea into the reactor.
3. The system of claim 2, wherein the ammonia injection subsystem further comprises a pressure relief valve and a surge tank;
one end of the pressure reducing valve is connected with the reactor, and the other end of the pressure reducing valve is connected with the pressure stabilizing box;
the ECU is connected to the pressure reducing valve and used for controlling the opening degree of the pressure reducing valve to enable the pressure value of the pressure stabilizing box to be increased when the pressure value of the pressure stabilizing box is smaller than a preset pressure value prestored by the ECU.
4. The system of claim 3, wherein the ammonia injection subsystem further comprises a shut-off valve;
the shutoff valve is arranged between the pressure reducing valve and the pressure stabilizing box;
the ECU is connected to the shutoff valve and is used for controlling the shutoff valve to be closed when the pressure value of the surge tank is larger than the preset pressure value.
5. The system of claim 4, wherein the ammonia injection subsystem further comprises a pressure sensor;
the pressure sensor is arranged on the pressure stabilizing box and is used for measuring the pressure value of the pressure stabilizing box;
the pressure sensor is also connected to the ECU for sending the pressure value to the ECU.
6. The system of claim 5, further comprising a post-processor coupled to the ammonia nozzle and the urea nozzle for receiving ammonia gas injected from the ammonia nozzle or urea injected from the urea nozzle for treating the exhaust gas.
7. The system of claim 6, further comprising a nitrogen-oxygen sensor and a temperature exhaust sensor;
the nitrogen-oxygen sensor is arranged on the aftertreatment device and is used for measuring the concentration of nitrogen oxides in exhaust gas; the nitrogen-oxygen sensor is also connected to the ECU and is used for sending the nitrogen oxide concentration to the ECU;
the exhaust temperature sensor is arranged on the post processor and is used for measuring the exhaust temperature; the exhaust temperature sensor is also connected to the ECU and used for sending the exhaust temperature to the ECU;
the ECU calculates an ammonia injection amount or a urea injection amount based on the nitrogen oxide concentration, the exhaust temperature, and a nitrogen oxide conversion rate.
8. The system of claim 7, further comprising a urea injection control unit DCU;
the DCU is connected with the ECU and is used for receiving the ammonia injection quantity and the urea injection quantity sent by the ECU;
the DCU is also connected with the urea nozzle and used for controlling the opening and closing of the urea nozzle based on the urea injection quantity;
the DCU is also connected with the ammonia gas nozzle and used for controlling the opening and closing of the ammonia gas nozzle based on the ammonia gas injection quantity.
9. The system of claim 8, wherein the DCU is further connected to the urea pump for controlling a rotational speed of the urea pump to thereby control an injection amount of urea;
the DCU is also connected with the urea injector and used for controlling the opening and closing of the urea injector.
10. A vehicle, characterized in that it has a system according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320260918.4U CN219733494U (en) | 2023-02-20 | 2023-02-20 | Dual injection system and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320260918.4U CN219733494U (en) | 2023-02-20 | 2023-02-20 | Dual injection system and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219733494U true CN219733494U (en) | 2023-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320260918.4U Active CN219733494U (en) | 2023-02-20 | 2023-02-20 | Dual injection system and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219733494U (en) |
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2023
- 2023-02-20 CN CN202320260918.4U patent/CN219733494U/en active Active
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