CN115016571A - Temperature control method and device of CCSCR (complementary Charge coupled device), vehicle and storage medium - Google Patents
Temperature control method and device of CCSCR (complementary Charge coupled device), vehicle and storage medium Download PDFInfo
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 61
- 239000000243 solution Substances 0.000 claims description 19
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 239000002699 waste material Substances 0.000 claims description 10
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- 229910044991 metal oxide Inorganic materials 0.000 abstract description 2
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- 239000004065 semiconductor Substances 0.000 abstract description 2
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- 230000006978 adaptation Effects 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
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Abstract
The invention belongs to the technical field of vehicles and discloses a temperature control method and device of CCSCR (complementary metal oxide semiconductor) equipment, a vehicle and a storage medium, wherein in the temperature control method of the CCSCR equipment, the actual temperature of a CCSCR catalyst is obtained and is compared with the actual temperature of the CCSCR catalyst and the preset temperature, the preset temperature is the lowest temperature required by the CCSCR catalyst to normally complete catalytic reaction, if the actual temperature of the CCSCR catalyst is lower than the preset temperature, the CCSCR equipment cannot normally operate at the current temperature, at the moment, a thermal management operation is executed to increase the temperature of the CCSCR catalyst, specifically, a waste gas bypass valve connected in parallel with a turbocharger is opened, so that high-temperature waste gas exhausted by an engine exhaust pipe directly reaches the CCSCR equipment through the waste gas bypass valve to quickly increase the temperature of the CCSCR catalyst; and if the actual temperature of the CCSCR catalyst is not less than the preset temperature, controlling the CCSCR equipment to spray urea solution, namely normally running.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a temperature control method and device of a CCSCR device, a vehicle and a storage medium.
Background
For meeting Nitrogen Oxide (NO) of vehicle under low-temperature working condition x ) Emission requirements in exhaust after-treatment systems, a two-stage Selective Catalytic Reduction (SCR) scheme is typically employed, where one stage is passed through a close-coupled processThe formula (ii) is connected to the supercharger tailpipe, i.e., Close Coupled Selective Catalytic Reduction (CCSCR). When the automobile is started in a cold state, the temperature of a CCSCR catalyst in CCSCR equipment is low, and the required temperature cannot be reached, so that the CCSCR efficiency is not high.
In the prior art, a scheme adopted for raising the temperature of the CCSCR catalyst is that the temperature of the CCSCR catalyst is raised quickly by means of the self characteristics (low heat capacity and tight coupling characteristics of the CCSCR device) of the CCSCR device, but the temperature of the CCSCR catalyst is raised slowly by the method, and the temperature of the CCSCR catalyst cannot reach the required temperature within a few minutes after a vehicle is started in a cold state. In other methods suitable for the whole exhaust aftertreatment system, the suitable equipment and working conditions are different, and the method is difficult to be suitable for CCSCR equipment when an automobile is in cold start so as to quickly raise the temperature of a CCSCR catalyst.
Therefore, a method, an apparatus, a vehicle and a storage medium for controlling the temperature of a CCSCR device are needed to solve the above problems.
Disclosure of Invention
According to one aspect of the invention, the invention provides a temperature control method of a CCSCR device, which aims to solve the problem that the temperature of a CCSCR catalyst cannot be quickly raised during cold start of an automobile in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a temperature control method of a CCSCR device for controlling a temperature of a CCSCR catalyst in the CCSCR device, the CCSCR device being connected to an exhaust pipe of a turbocharger, the turbocharger being provided with a wastegate valve in parallel, an outlet end of the wastegate valve being connected to the CCSCR device, comprising:
acquiring the actual temperature of the CCSCR catalyst;
comparing the actual temperature of the CCSCR catalyst with a preset temperature;
if the actual temperature of the CCSCR catalyst is less than the preset temperature, executing a thermal management operation, wherein the thermal management operation comprises the following steps: opening the waste gate valve;
and if the actual temperature of the CCSCR catalyst is not less than the preset temperature, controlling the CCSCR equipment to spray urea solution.
As a preferable mode of the temperature control method, the wastegate valve is a proportional valve, and opening the wastegate valve includes:
calculating the difference value between the preset temperature and the actual temperature of the CCSCR catalyst;
and controlling the opening ratio of the waste gas bypass valve according to the difference value.
As a preferable scheme of the temperature control method, the thermal management operation further includes:
and controlling the partial cylinders to stop working.
As a preferable aspect of the temperature control method, the thermal management operation further includes:
timing of fuel injection of the engine is retarded and idle speed of the engine is raised.
As a preferable scheme of the temperature control method, the method further comprises the following steps of synchronously executing the thermal management operation:
evaluating whether the temperature reaches the standard or not based on the actual temperature of the CCSCR catalyst;
if the temperature reaches the standard, stopping executing the thermal management operation, and executing and controlling the CCSCR equipment to inject urea solution;
and if the temperature does not reach the standard, performing the estimation of whether the temperature reaches the standard or not based on the actual temperature of the CCSCR catalyst.
As a preferable aspect of the temperature control method, the estimating whether the temperature is up to the standard based on the actual temperature of the CCSCR catalyst includes:
acquiring the actual temperature of the CCSCR catalyst;
comparing the actual temperature of the CCSCR catalyst with the preset temperature;
if the actual temperature of the CCSCR catalyst is not less than the preset temperature, determining that the temperature reaches the standard;
and if the actual temperature of the CCSCR catalyst is lower than the preset temperature, determining that the temperature does not reach the standard.
As a preferable scheme of the temperature control method, the method further comprises the following steps after controlling the CCSCR device to inject the urea solution:
acquiring the concentration of nitrogen oxides at the outlet end of the CCSCR equipment;
judging the concentration of the nitrogen oxides at the outlet end of the CCSCR equipment and the preset concentration;
and if the concentration of the nitrogen oxides at the outlet end of the CCSCR equipment is greater than the preset concentration, executing thermal management operation.
According to another aspect of the present invention, there is provided a temperature control apparatus of a CCSCR device, comprising:
the temperature acquisition module is used for acquiring the actual temperature of the CCSCR catalyst;
the temperature comparison module is used for comparing the actual temperature of the CCSCR catalyst with the preset temperature;
the urea injection control module is used for controlling the CCSCR equipment to inject urea solution when the actual temperature of the CCSCR catalyst is not less than the preset temperature;
and the thermal management operation control module is used for executing thermal management operation when the actual temperature of the CCSCR catalyst is less than the preset temperature.
According to still another aspect of the present invention, there is provided a vehicle including an engine, and a CCSCR device and a turbocharger provided in an exhaust gas discharge line of the engine, the CCSCR device being connected to an exhaust pipe of the turbocharger, the turbocharger being provided in parallel with a wastegate valve, an outlet end of the wastegate valve being connected to the CCSCR device, the vehicle further including:
ECU；
a temperature sensor for detecting an actual temperature of the CCSCR catalyst and transmitting the detected actual temperature of the CCSCR catalyst to the ECU;
a memory for storing one or more programs;
when the one or more programs are executed by the ECU, the ECU causes the ECU to control the vehicle to implement the temperature control method of the CCSCR device.
According to yet another aspect of the present invention, there is provided a storage medium having stored thereon a computer program which, when executed by an ECU, implements the above-described method of temperature control of a CCSCR device.
The invention has the beneficial effects that:
the invention provides a temperature control method and a device of CCSCR (complementary metal oxide semiconductor) equipment, a vehicle and a storage medium, wherein in the temperature control method of the CCSCR equipment, the actual temperature of a CCSCR catalyst is obtained and is compared with the actual temperature of the CCSCR catalyst and the preset temperature, the preset temperature is the lowest temperature required by the CCSCR catalyst to normally finish catalytic reaction, if the actual temperature of the CCSCR catalyst is lower than the preset temperature, the CCSCR equipment cannot normally run at the current temperature, at the moment, a thermal management operation is executed to improve the temperature of the CCSCR catalyst, specifically, a waste gas bypass valve connected in parallel with a turbocharger is started, so that high-temperature waste gas exhausted by an engine exhaust pipe directly reaches the CCSCR equipment through the waste gas bypass valve to quickly improve the temperature of the CCSCR catalyst; and if the actual temperature of the CCSCR catalyst is not less than the preset temperature, controlling the CCSCR equipment to spray urea solution, namely normally running.
Drawings
FIG. 1 is a schematic diagram of an engine and its exhaust line according to an embodiment of the present invention;
FIG. 2 is a first flowchart of a method for controlling the temperature of a CCSCR device in accordance with an embodiment of the present invention;
FIG. 3 is a second flowchart of a method for controlling the temperature of a CCSCR device in accordance with an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a temperature control device of a CCSCR device in an embodiment of the present invention;
fig. 5 is a schematic structural view of a vehicle in the embodiment of the invention.
In the figure:
300. a temperature acquisition module; 310. a temperature comparison module; 320. a urea injection control module; 330. a thermal management operation control module;
400. an ECU; 410. an engine; 420. a CCSCR device; 430. a turbocharger; 440. a wastegate valve; 450. a temperature sensor; 460. a memory.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
When the automobile is in cold start, the temperature of the CCSCR catalyst is low, and the required temperature cannot be reached, so that the CCSCR efficiency is not high. The prior art mostly utilizes the self characteristic of CCSCR equipment to promote the temperature of CCSCR catalyst fast, and the temperature promotes more slowly, and to in other methods that are applicable to whole tail gas aftertreatment system, its equipment and the operating mode that are suitable for are all different, are difficult to promote the temperature of CCSCR catalyst fast when the car cold start.
To solve the above problem, the present embodiment provides a temperature control method for a CCSCR device, so as to solve the problem that the temperature of a CCSCR catalyst cannot be quickly raised during cold start of an automobile in the prior art, and can be used in the technical field of vehicles. Referring to fig. 1, the temperature control method of the CCSCR device is used for controlling the temperature of a CCSCR catalyst in the CCSCR device, the CCSCR device is connected to an exhaust pipe of a turbocharger, the turbocharger is provided with a waste gate valve in parallel, an outlet end of the waste gate valve is connected to the CCSCR device, specifically, an air inlet pipe of the turbocharger and an inlet end of the waste gate valve are both connected to an exhaust pipe of an engine, that is, the turbocharger and the waste gate valve are arranged between the exhaust pipe of the engine and the CCSCR device in parallel, high-temperature exhaust gas discharged from the exhaust pipe of the engine can enter the CCSCR device through the turbocharger, and when the waste gate valve is opened, the high-temperature exhaust gas can directly enter the CCSCR device through the waste gate valve.
The temperature control method of the CCSCR device is performed by a temperature control apparatus of the CCSCR device, which may be implemented in software and/or hardware and integrated in a vehicle, and specifically, as shown in fig. 2, includes the following steps.
S100: the actual temperature of the CCSCR catalyst is obtained.
The actual temperature of the CCSCR catalyst may be obtained by a temperature sensor located in the CCSCR device.
S110: and comparing the actual temperature of the CCSCR catalyst with the preset temperature.
If the actual temperature of the CCSCR catalyst is lower than the preset temperature, executing S120; if the actual temperature of the CCSCR catalyst is not less than the preset temperature, S160 is executed.
The preset temperature is the lowest working temperature at which the catalytic efficiency of the CCSCR catalyst can meet the requirement when the CCSCR device injects urea, namely the lowest temperature at which the CCSCR device can normally work. If the actual temperature of the CCSCR catalyst is lower than the preset temperature, urea crystallization and other phenomena can be generated when urea is injected, and the efficiency of the CCSCR device is low. If the actual temperature of the CCSCR catalyst is not less than the preset temperature, the fact that the CCSCR device can inject urea to carry out selective catalytic reduction normally at the moment is indicated, namely the CCSCR device works under normal efficiency.
S120: performing thermal management operations, the thermal management operations comprising: the wastegate valve is opened.
And if the actual temperature of the CCSCR catalyst is less than the preset temperature, executing thermal management operation to increase the temperature of the CCSCR catalyst. Specifically, in the present embodiment, the thermal management operation includes opening the wastegate valve, and since the high-temperature exhaust gas discharged from the exhaust pipe of the engine can enter the CCSCR device through the turbocharger, it can also enter the CCSCR device directly through the wastegate valve. Part of gas passing through the turbocharger needs to drive the turbine to rotate to do work, the temperature is relatively low, and the temperature of part of gas passing through the waste gas bypass valve is relatively high, so that after the waste gas bypass valve is opened, the high-temperature gas directly enters CCSCR equipment, the characteristic that the exhaust temperature is high before the turbine is fully utilized, and the temperature of a CCSCR catalyst can be quickly increased.
Specifically, the thermal management operation includes steps S121, S122, S123, and S124, in this embodiment, steps S121, S122, S123, and S124 are executed synchronously, and in other embodiments, the above four steps may also be executed sequentially according to a certain order; or, when the difference between the preset temperature and the actual temperature of the CCSCR catalyst is small, one or a part of the four steps is executed, and when the difference between the preset temperature and the actual temperature of the CCSCR catalyst is large, the four steps are simultaneously executed.
S121: the wastegate valve is opened.
High-temperature exhaust gas discharged from an exhaust pipe of the engine can enter the CCSCR device through a turbocharger and can also enter the CCSCR device directly through a waste gate valve. Part of gas passing through the turbocharger needs to drive the turbine to rotate to do work, the temperature is relatively low, and the temperature of part of gas passing through the waste gas bypass valve is relatively high, so that after the waste gas bypass valve is opened, the high-temperature gas directly enters CCSCR equipment, the characteristic that the exhaust temperature is high before the turbine is fully utilized, and the temperature of a CCSCR catalyst can be quickly increased.
Specifically, S121 includes S1211-S1212.
S1211: the difference between the preset temperature and the actual temperature of the CCSCR catalyst is calculated.
At the moment, the actual temperature of the CCSCR catalyst is lower than the preset temperature, so that the difference value of the actual temperature of the CCSCR catalyst and the preset temperature can be obtained by directly subtracting the actual temperature of the CCSCR catalyst from the preset temperature, and the difference value is a positive number.
S1212: and controlling the opening ratio of the waste gas bypass valve according to the difference value.
In this embodiment, the opening ratio of the corresponding wastegate valve is queried from a difference-opening ratio map preset in the ECU based on a difference between a preset temperature and an actual temperature of the CCSCR catalyst, and the opening ratio of the wastegate valve is controlled, where the difference-opening ratio map can be obtained through a large number of previous experiments.
S122: and controlling the partial cylinders to stop working.
For example, when the engine is a six-cylinder engine, three cylinders may be controlled to stop operating, and two cylinders or four cylinders may be controlled to stop operating, but not limited thereto. The specific control method is common knowledge in the field and is not described in detail. The air flow is reduced by controlling the work stop of part of the cylinders, the air-fuel ratio is reduced, the exhaust temperature of the engine can be increased, and the temperature of the CCSCR catalyst is further increased.
S123: the injection timing of the engine is retarded.
Numerous tests have shown that the exhaust temperature can be increased by retarding the timing of injection to the engine, thereby raising the temperature of the CCSCR catalyst by the increase in exhaust temperature. It should be noted, however, that the delay in the injection timing should remain within a range beyond which the exhaust gas temperature may drop if the injection timing is further delayed.
S124: and the idle speed of the engine is improved.
The exhaust gas temperature can also be raised by raising the idle speed of the engine, thereby raising the temperature of the CCSCR catalyst. Specifically, the idling speed of the engine can be improved by adjusting the opening degree of a throttle valve or the idling oil supply amount.
S160: and controlling the CCSCR device to inject the urea solution.
And if the actual temperature of the CCSCR catalyst is not less than the preset temperature, controlling the CCSCR equipment to inject urea solution, namely controlling the CCSCR equipment to normally operate.
According to the temperature control method of the CCSCR device, the actual temperature of the CCSCR catalyst is obtained and is compared with the preset temperature, the preset temperature is the lowest temperature required by the CCSCR catalyst to normally complete catalytic reaction, if the actual temperature of the CCSCR catalyst is lower than the preset temperature, it is indicated that the CCSCR device cannot normally operate at the current temperature, at the moment, heat management operation is executed to raise the temperature of the CCSCR catalyst, specifically, a waste gas bypass valve connected in parallel with a turbocharger is opened, high-temperature waste gas exhausted by an engine exhaust pipe directly reaches the CCSCR device through the waste gas bypass valve, so that the temperature of the CCSCR catalyst is quickly raised, in addition, the fuel injection timing of the engine is delayed, the idling of the engine is raised, and the temperature rising rate of the CCSCR catalyst can be further raised by controlling part of cylinders to stop working. And if the actual temperature of the CCSCR catalyst is not less than the preset temperature, controlling the CCSCR equipment to spray urea solution, namely normally running.
Example two
As shown in fig. 3, the present embodiment provides a temperature control method of a CCSCR device, which is embodied on the basis of the first embodiment. The temperature control method of the CCSCR device comprises the following steps.
S200: the actual temperature of the CCSCR catalyst is obtained.
S210: and comparing the actual temperature of the CCSCR catalyst with the preset temperature.
If the actual temperature of the CCSCR catalyst is lower than the preset temperature, executing S220; if the actual temperature of the CCSCR catalyst is not less than the preset temperature, executing S260.
S220: a thermal management operation is performed.
The thermal management operation is performed until the actual temperature of the CCSCR catalyst is not less than the preset temperature. Specifically, the following steps are performed in synchronization with step S220: evaluating whether the temperature reaches the standard or not based on the actual temperature of the CCSCR catalyst, if so, stopping executing thermal management operation, and executing control of CCSCR equipment to inject urea solution; and if the temperature does not reach the standard, performing the estimation of whether the temperature reaches the standard or not based on the actual temperature of the CCSCR catalyst.
The operation of thermal management inevitably causes negative effects, such as the fact that after the wastegate valve is opened, the gas entering the turbocharger becomes less, resulting in a reduction in the turbocharger power. Therefore, after the actual temperature of the CCSCR catalyst can meet the requirement of normal operation, the execution of the thermal management operation should be stopped as soon as possible to eliminate the negative effect of the thermal management operation. And if the temperature does not reach the standard, re-evaluating whether the temperature reaches the standard, wherein the thermal management operation is always in a state of being executed, so that the temperature of the CCSCR catalyst is gradually increased.
Specifically, assessing whether the temperature is up based on the actual temperature of the CCSCR catalyst includes steps S230-S240.
S230: the actual temperature of the CCSCR catalyst is obtained.
While the thermal management operation is being performed to raise the temperature of the CCSCR catalyst, the actual temperature of the CCSCR catalyst is re-sensed, which may also be obtained by a temperature sensor provided with the CCSCR device.
S240: and comparing the actual temperature of the CCSCR catalyst with the preset temperature.
If the actual temperature of the CCSCR catalyst is lower than the preset temperature, determining that the temperature does not reach the standard, and returning to execute S230; and if the actual temperature of the CCSCR catalyst is not less than the preset temperature, determining that the temperature reaches the standard, and executing S250-S260.
And while the thermal management operation is executed, acquiring the actual temperature of the CCSCR catalyst, and if the actual temperature of the CCSCR catalyst is still less than the preset temperature, indicating that the temperature does not reach the standard, re-acquiring the actual temperature of the CCSCR catalyst. And when the temperature of the CCSCR catalyst is increased to be not less than the preset temperature, indicating that the temperature reaches the standard, and executing S250.
S250: the execution of the thermal management operation is stopped.
S260: and controlling the CCSCR device to inject the urea solution.
After step S260, execution continues with S270-S280.
S270: and acquiring the concentration of nitrogen oxides at the outlet end of the CCSCR device.
The temperature of the CCSCR catalyst meets the requirement, and after the CCSCR equipment sprays urea solution, the concentration of nitrogen oxide at the outlet end of the CCSCR equipment is detected, and whether the concentration of nitrogen oxide at the outlet end of the CCSCR equipment meets the requirement or not is judged. The concentration of nitrogen oxides at the outlet end of the CCSCR device can be obtained by a nitrogen-oxygen sensor arranged at the outlet end of the CCSCR device.
S280: and judging the concentration of the nitrogen oxides at the outlet end of the CCSCR equipment and the preset concentration.
If the concentration of the nitrogen oxides at the outlet end of the CCSCR equipment is greater than the preset concentration, executing S220; and if the concentration of the nitrogen oxides at the outlet end of the CCSCR equipment is not greater than the preset concentration, ending the temperature control method of the CCSCR equipment.
The predetermined concentration is the maximum allowable nox concentration for the CCSCR device, and is generally set by relevant standards and specifications. If the concentration of the nitrogen oxides at the outlet end of the CCSCR equipment is greater than the preset concentration, the requirement is not met, and thermal management operation needs to be executed to raise the temperature of the CCSCR catalyst and reduce the concentration of the nitrogen oxides at the outlet end of the CCSCR equipment. In addition, part of the steps in the thermal management operation have the effect of reducing the generation of nitrogen oxides, for example, in the step of delaying the injection timing of the engine, the delay of the injection of the engine can improve the fuel injection rate, reduce the maximum combustion temperature in a cylinder, and shorten the retention time of nitrogen and oxygen in the mixed gas at a high temperature, so that the generation of the nitrogen oxides can be reduced. If the concentration of the nitrogen oxides at the outlet end of the CCSCR equipment is not greater than the preset concentration, the requirement is met, at the moment, the engine of the vehicle is started for a period of time, the temperature of the CCSCR catalyst also reaches the requirement, the condition that the efficiency of the CCSCR equipment is insufficient usually cannot occur again, and therefore the temperature control method of the CCSCR equipment is directly finished.
In the temperature control method of the CCSCR device provided in this embodiment, on the basis of the temperature control method of the CCSCR device in the first embodiment, when the thermal management operation is performed, whether the temperature reaches the standard is evaluated based on the actual temperature of the CCSCR catalyst, and if the temperature reaches the standard, the thermal management operation is stopped, so that the negative effect caused by the thermal management operation is eliminated as soon as possible. In addition, after the CCSCR equipment is controlled to spray urea solution, the concentration of nitrogen oxides at the outlet end of the CCSCR equipment is obtained, the concentration of the nitrogen oxides is judged, and the concentration is compared with the preset concentration, so that the efficiency of the CCSCR equipment can be verified, and whether the CCSCR equipment works at normal efficiency or not is judged.
EXAMPLE III
The present embodiment provides a temperature control apparatus of a CCSCR device, which can execute the temperature control method of the CCSCR device described in the above embodiments.
Specifically, as shown in FIG. 4, the temperature control apparatus of the CCSCR device includes a temperature acquisition module 300, a temperature comparison module 310, a urea injection control module 320, and a thermal management operation control module 330.
The temperature obtaining module 300 is used for obtaining the actual temperature of the CCSCR catalyst; the temperature comparison module 310 is configured to compare an actual temperature of the CCSCR catalyst with a preset temperature; the urea injection control module 320 is used for controlling the CCSCR device to inject urea solution when the actual temperature of the CCSCR catalyst is not less than the preset temperature; the thermal management operation control module 330 is configured to perform a thermal management operation when the actual temperature of the CCSCR catalyst is less than a preset temperature.
The temperature control device of the CCSCR apparatus provided in this embodiment obtains the actual temperature of the CCSCR catalyst through the temperature obtaining module 300; comparing the actual temperature of the CCSCR catalyst with a preset temperature by a temperature comparison module 310; when the actual temperature of the CCSCR catalyst is not less than the preset temperature, the urea injection control module 320 controls the CCSCR device to inject urea solution; when the actual temperature of the CCSCR catalyst is less than the preset temperature, a thermal management operation is performed by the thermal management operation control module 330. The temperature of the CCSCR catalyst can be quickly increased when the CCSCR device cannot normally operate.
Example four
The present embodiment provides a vehicle that includes an ECU400, an engine 410, a CCSCR device 420, a turbocharger 430, a wastegate valve 440, a temperature sensor 450, and a memory 460, as shown in fig. 5.
Specifically, both CCSCR device 420 and turbocharger 430 are disposed in the exhaust gas discharge line of engine 410, CCSCR device 420 is connected to the exhaust pipe of turbocharger 430, wastegate valve 440 is disposed in parallel to turbocharger 430, and the outlet end of wastegate valve 440 is connected to CCSCR device 420. Temperature sensor 450 is used to detect the actual temperature of the CCSCR catalyst and send the detected actual temperature of the CCSCR catalyst to ECU 400.
The memory 460 mainly includes a program storage area and a data storage area, wherein the program storage area can store an operating system and an application program required by at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 460 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, memory 460 may further include memory 460 located remotely from ECU400, which may be connected to the vehicle over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The vehicle according to the fourth embodiment of the present invention is the same as the method for controlling the temperature of the CCSCR device according to the previous embodiment, and the technical details that are not described in detail in the present embodiment can be referred to the previous embodiment, and the present embodiment has the same beneficial effects as the method for controlling the temperature of the CCSCR device.
EXAMPLE five
Fifth embodiment of the present invention also provides a storage medium having a computer program stored thereon, which when executed by an ECU, implements a method for controlling the temperature of a CCSCR device according to the fifth embodiment of the present invention.
Of course, the storage medium containing the computer-executable instructions provided by the embodiments of the present invention is not limited to the operations in the temperature control method of the CCSCR apparatus described above, and may also perform related operations in the temperature control device of the CCSCR apparatus provided by the embodiments of the present invention, and has corresponding functions and advantages.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, and the computer software product may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions to enable a computer device (which may be a robot, a personal computer, a server, or a network device) to execute the temperature control method of the CCSCR device according to the embodiments of the present invention.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A temperature control method of a CCSCR device is used for controlling the temperature of a CCSCR catalyst in the CCSCR device, the CCSCR device is connected with an exhaust pipe of a turbocharger, the turbocharger is provided with a waste gas bypass valve in parallel, and the outlet end of the waste gas bypass valve is connected with the CCSCR device, and the temperature control method is characterized by comprising the following steps:
obtaining an actual temperature of the CCSCR catalyst;
comparing the actual temperature of the CCSCR catalyst with a preset temperature;
if the actual temperature of the CCSCR catalyst is less than the preset temperature, executing a thermal management operation, wherein the thermal management operation comprises the following steps: opening the wastegate valve;
and if the actual temperature of the CCSCR catalyst is not less than the preset temperature, controlling the CCSCR equipment to spray urea solution.
2. The method of temperature control of a CCSCR device of claim 1, wherein the wastegate valve is a proportional valve and opening the wastegate valve comprises:
calculating the difference between the preset temperature and the actual temperature of the CCSCR catalyst;
and controlling the opening ratio of the waste gas bypass valve according to the difference value.
3. The method of temperature control for a CCSCR device of claim 1, wherein the thermal management operations further comprise:
and controlling the partial cylinders to stop working.
4. The method of temperature control of a CCSCR device of claim 1, wherein the thermal management operations further comprise:
timing of fuel injection of the engine is retarded and idle speed of the engine is raised.
5. The method of temperature control of a CCSCR device of any one of claims 1-4, further comprising, in synchronization with performing the thermal management operation:
evaluating whether the temperature reaches the standard or not based on the actual temperature of the CCSCR catalyst;
if the temperature reaches the standard, stopping executing the thermal management operation, and executing control of the CCSCR equipment to inject urea solution;
and if the temperature does not reach the standard, performing the estimation of whether the temperature reaches the standard or not based on the actual temperature of the CCSCR catalyst.
6. The CCSCR apparatus temperature control method of claim 5, wherein estimating whether the temperature is up based on the actual temperature of the CCSCR catalyst comprises:
obtaining an actual temperature of the CCSCR catalyst;
comparing the actual temperature of the CCSCR catalyst with the preset temperature;
if the actual temperature of the CCSCR catalyst is not less than the preset temperature, determining that the temperature reaches the standard;
and if the actual temperature of the CCSCR catalyst is lower than the preset temperature, determining that the temperature does not reach the standard.
7. The method of temperature control of a CCSCR device of any one of claims 1-4, further comprising, after controlling the CCSCR device to inject urea solution:
acquiring the concentration of nitrogen oxides at the outlet end of the CCSCR equipment;
judging the concentration of the nitrogen oxides at the outlet end of the CCSCR equipment and the preset concentration;
and if the concentration of the nitrogen oxides at the outlet end of the CCSCR equipment is greater than the preset concentration, executing thermal management operation.
8. A temperature control apparatus for a CCSCR device, comprising:
the temperature acquisition module is used for acquiring the actual temperature of the CCSCR catalyst;
the temperature comparison module is used for comparing the actual temperature of the CCSCR catalyst with the preset temperature;
the urea injection control module is used for controlling the CCSCR equipment to inject urea solution when the actual temperature of the CCSCR catalyst is not less than the preset temperature;
and the thermal management operation control module is used for executing thermal management operation when the actual temperature of the CCSCR catalyst is less than the preset temperature.
9. A vehicle, includes the engine, and set up in CCSCR equipment and the turbo charger in the exhaust emission pipeline of engine, CCSCR equipment connects in turbo charger's blast pipe, the turbo charger is parallelly connected to be provided with the waste gate valve, the exit end of waste gate valve connect in CCSCR equipment, its characterized in that still includes:
ECU；
the temperature sensor is used for detecting the actual temperature of the CCSCR catalyst and sending the detected actual temperature of the CCSCR catalyst to the ECU;
a memory for storing one or more programs;
the one or more programs, when executed by the ECU, cause the ECU to control a vehicle to implement the temperature control method of a CCSCR device of any one of claims 1-7.
10. A storage medium having a computer program stored thereon, wherein the program, when executed by an ECU, causes a vehicle to implement a method of controlling the temperature of a CCSCR device as defined in any one of claims 1 to 7.
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| CN115016571B (en) * | 2022-07-01 | 2023-12-15 | 潍柴动力股份有限公司 | Temperature control method and device of CCSCR (semiconductor control rectifier) equipment, vehicle and storage medium |
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