CN110630363B - Urea nozzle cooling protection control method and equipment - Google Patents
Urea nozzle cooling protection control method and equipment Download PDFInfo
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- CN110630363B CN110630363B CN201910905996.3A CN201910905996A CN110630363B CN 110630363 B CN110630363 B CN 110630363B CN 201910905996 A CN201910905996 A CN 201910905996A CN 110630363 B CN110630363 B CN 110630363B
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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
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1404—Exhaust gas temperature
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1602—Temperature of exhaust gas apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The embodiment of the invention provides a urea nozzle cooling protection control method and equipment, wherein the method comprises the following steps: detecting whether the SCR system meets a pressure building condition; when the SCR system is detected to meet the pressure build-up condition, controlling the SCR system to build pressure so that the urea nozzle enters a to-be-sprayed state; monitoring the non-injection time of the urea nozzle and the temperature at the injection hole of the urea nozzle, wherein the temperature is acquired by using an SCR upstream temperature sensor; when the non-injection time exceeds a first preset time threshold and the temperature at the injection hole of the urea nozzle exceeds a preset temperature interval, controlling the urea nozzle to inject urea; and when detecting that the urea nozzle continuously injects urea to meet a second preset time threshold, stopping the urea nozzle from injecting urea. The embodiment of the invention can realize timely cooling of the urea nozzle after the urea nozzle does not work for a long time in a high-temperature environment, avoid the condition that the urea solution is not sprayed for a long time in the high-temperature environment to cause the damage of the urea nozzle, and prolong the service life of the urea nozzle.
Description
Technical Field
The embodiment of the invention relates to the technical field of diesel engine tail gas aftertreatment, in particular to a urea nozzle cooling protection control method and urea nozzle cooling protection control equipment.
Background
Selective Catalytic Reduction (SCR) is one of the most effective aftertreatment technologies currently recognized for reducing the emission of nitrogen oxides in the exhaust gas of diesel engines. The SCR system of the diesel engine comprises a urea box, a urea pump, a urea nozzle, a connecting pipeline and the like, wherein the urea nozzle is a device for realizing urea injection of the SCR system, urea solution is sprayed into the SCR box through the urea nozzle, the urea solution is subjected to high-temperature evaporation, pyrolysis and hydrolysis in an exhaust pipe to generate a reducing agent ammonia gas, and the ammonia gas selectively reduces nitrogen oxides into nitrogen under the action of a catalyst so as to reduce the content of the nitrogen oxides in tail gas.
The urea nozzle of the SCR system of the diesel engine is positioned in an SCR box connected with an exhaust pipe and is influenced by high-temperature tail gas of the exhaust pipe, and the urea nozzle needs to be cooled. In the prior art, in order to cool the urea nozzle, a water circulation cooling interface is usually arranged on a body of the urea nozzle.
However, since the diameter of the spray hole of the urea nozzle is small, the cooling liquid interface cannot extend to the spray hole of the urea nozzle, and in a high-temperature environment, when the urea solution is not sprayed for a long time and cannot cool the spray hole of the urea nozzle, the urea nozzle still can be damaged due to overheating.
Disclosure of Invention
The embodiment of the invention provides a urea nozzle cooling protection control method and urea nozzle cooling protection control equipment, which are used for solving the problem that in a high-temperature environment, a urea solution cannot be sprayed for a long time to cool a spray hole of a nozzle, and the nozzle is still overheated and damaged in the prior art.
In a first aspect, an embodiment of the present invention provides a urea nozzle cooling protection control method, including:
detecting whether the selective catalytic reduction SCR system meets a pressure building condition;
when the SCR system is detected to meet the pressure building condition, controlling the SCR system to build pressure so that the urea nozzle enters a to-be-sprayed state;
monitoring the non-injection time of the urea nozzle and the temperature at the injection hole of the urea nozzle;
when the non-injection time exceeds a first preset time threshold and the temperature at the injection hole of the urea nozzle exceeds a preset temperature interval, controlling the urea nozzle to inject urea;
and when detecting that the urea nozzle continuously injects urea to meet a second preset time threshold, stopping the urea nozzle from injecting urea.
In one possible design, after monitoring the non-injection time of the urea nozzle and the temperature at the injection hole of the urea nozzle, the method further includes: detecting whether the T15 is powered down; if the power is turned off at T15, when the non-injection time before the power is turned off at T15 exceeds a first preset time threshold and the temperature at the injection hole of the urea nozzle before the power is turned off at T15 exceeds a preset temperature interval, continuing to control the urea nozzle to inject urea in an Afterrun state, and ending injection after the urea injection in the Afterrun state meets a third preset time threshold; and if the T15 is not powered down, continuing to execute the step of controlling the urea nozzle to inject the urea when the non-injection time exceeds a first preset time threshold and the temperature at the injection hole of the urea nozzle exceeds a preset temperature interval.
In one possible design, after ending the process after the after-urea injection in the Afterrun state meets a third preset time threshold, the method further includes: if the power is turned on again at T15, the step of detecting whether the SCR system meets the voltage build-up condition is repeated.
In one possible design, the detecting whether the SCR system satisfies the pressure build-up condition includes:
and detecting whether the exhaust temperature of the engine reaches a set temperature value or not, and if so, determining that the SCR system meets the pressure building condition.
In one possible design, monitoring a temperature at an orifice of the urea nozzle includes: and receiving the temperature collected by the upstream temperature sensor of the SCR system in real time.
In one possible design, after stopping the urea nozzle from injecting urea when it is detected that the urea nozzle continues to inject urea for a second preset time threshold, the method further includes: the steps of monitoring the non-injection time of the urea nozzle and the temperature at the injection hole of the urea nozzle are repeatedly performed.
In a second aspect, an embodiment of the present invention provides a urea nozzle cooling protection control apparatus, including:
the voltage build-up detection module is used for detecting whether the SCR system meets a voltage build-up condition;
the pressure building module is used for controlling the SCR system to build pressure so that a urea nozzle enters a to-be-sprayed state when the SCR system is detected to meet a pressure building condition;
the monitoring module is used for monitoring the non-injection time of the urea nozzle and the temperature at the injection hole of the urea nozzle;
the injection control module is used for controlling the urea nozzle to inject urea when the non-injection time exceeds a first preset time threshold and the temperature at the injection hole of the urea nozzle exceeds a preset temperature interval; and when detecting that the urea nozzle continuously injects urea to meet a second preset time threshold, stopping the urea nozzle from injecting urea.
In one possible design, the apparatus further includes:
the power-off detection module is used for detecting whether the power is off or not by T15 after the non-injection time of the urea nozzle and the temperature at the injection hole of the urea nozzle are monitored; if the power is turned off at T15, when the non-injection time before the power is turned off at T15 exceeds a first preset time threshold and the temperature at the injection hole of the urea nozzle before the power is turned off at T15 exceeds a preset temperature interval, continuing to control the urea nozzle to inject urea in an Afterrun state, and ending injection after the urea injection in the Afterrun state meets a third preset time threshold; and if the T15 is not powered down, continuing to execute the step of controlling the urea nozzle to inject the urea when the non-injection time exceeds a first preset time threshold and the temperature at the injection hole of the urea nozzle exceeds a preset temperature interval.
In a third aspect, an embodiment of the present invention provides an SCR system, including: the SCR controller is connected with the urea pump, the urea nozzle, the SCR catalytic converter, the upstream temperature sensor and the downstream temperature sensor, the exhaust temperature collected by the upstream temperature sensor is determined as the temperature at the spray hole of the urea nozzle, and the temperature at the spray hole of the urea nozzle is fed back to the SCR controller;
the SCR controller comprises at least one processor and a memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the urea nozzle cooling protection control method as set forth above in the first aspect and in various possible designs of the first aspect.
In a fourth aspect, embodiments of the present invention provide a computer-readable storage medium having stored thereon computer-executable instructions that, when executed by a processor, implement a urea nozzle cooling protection control method as set forth in the first aspect and various possible designs of the first aspect.
According to the urea nozzle cooling protection control method and the urea nozzle cooling protection control device, the non-injection time of the urea nozzle and the temperature of the injection hole of the urea nozzle are monitored, when the non-injection time exceeds a first preset time threshold value and the temperature of the injection hole of the urea nozzle exceeds a preset temperature interval, the urea nozzle is controlled to inject urea, timely cooling of the urea nozzle after long-time non-operation in a high-temperature environment can be achieved, the condition that the urea solution is not injected for a long time in the high-temperature environment to cause overheating damage to the urea nozzle is avoided, and the service life of the urea nozzle is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of an SCR system according to an embodiment of the present invention;
FIG. 2 is a first flowchart illustrating a urea nozzle cooling protection control method according to an embodiment of the present invention;
FIG. 3 is a second schematic flow chart of a urea nozzle cooling protection control method according to an embodiment of the present invention;
FIG. 4 is a first schematic structural diagram of a urea nozzle cooling protection control device according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram II of a urea nozzle cooling protection control device according to an embodiment of the present invention;
fig. 6 is a schematic hardware structure diagram of an SCR controller according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Noun interpretation
An SCR system: selective Catalytic Reduction (SCR) is currently one of the most effective aftertreatment technologies recognized for reducing nitrogen oxide emissions in diesel exhaust. The SCR system of the diesel engine comprises a urea box, a urea pump, a urea nozzle and a connecting pipeline, wherein the urea nozzle is a device for realizing urea injection of the SCR system, urea solution is sprayed into the SCR box of the exhaust pipe through the urea nozzle, the urea solution is subjected to high-temperature evaporation, pyrolysis and hydrolysis in the exhaust pipe to obtain a reducing agent ammonia, and the ammonia selectively reduces nitrogen oxides into nitrogen under the action of a catalyst so as to reduce the content of the nitrogen oxides in tail gas.
Fig. 1 is a schematic structural diagram of an SCR system according to an embodiment of the present invention. As shown in fig. 1, the system provided by the present embodiment includes: an SCR controller 10, a urea pump 20, a urea injector 30, an SCR catalytic converter 40, an upstream temperature sensor 50, a downstream temperature sensor 60.
The SCR controller 10 is in communication with the urea pump 20, the urea nozzle 30, the upstream temperature sensor 50, and the downstream temperature sensor 60, respectively. A pressure sensor and a temperature sensor are arranged in the urea pump 20, and the urea pump 20 can provide injection pressure for the urea nozzle 30 through pressure build-up. The SCR catalytic converter 40 is a device that causes urea to undergo a reduction reaction with nitrogen oxides in the exhaust gas. The upstream temperature sensor 50 and the downstream temperature sensor 60 are used to detect the upstream exhaust gas temperature and the downstream exhaust gas temperature of the SCR catalytic converter 40, respectively. The exhaust gas temperature upstream of the SCR catalytic converter is also the exhaust gas temperature of the engine. The temperature sensor 70 provided at the urea nozzle orifice is used to detect the temperature of the urea nozzle orifice.
Fig. 2 is a schematic flow chart of a urea nozzle cooling protection control method according to an embodiment of the present invention, where an execution main body of the embodiment may be an SCR controller according to the embodiment shown in fig. 1. As shown in fig. 2, the method includes:
s201: and detecting whether the SCR system meets a pressure building condition.
Specifically, whether the exhaust temperature of the engine reaches a set temperature value or not can be detected, and if the exhaust temperature reaches the set temperature value, it is determined that the SCR system meets the pressure build-up condition. Referring to fig. 1, the temperature value received from a temperature sensor 50 upstream of the SCR catalytic converter of the SCR system is the exhaust temperature of the engine.
The set temperature value is the optimal temperature required by the SCR catalytic converter for carrying out reduction reaction on urea and nitrogen oxides in tail gas.
S202: and when the SCR system is detected to meet the pressure build-up condition, controlling the SCR system to build pressure so that the urea nozzle enters a to-be-injected state.
Specifically, the urea nozzle may be brought into a state to be injected by controlling a urea pump of the SCR system to build pressure.
The urea pump is internally provided with a pressure sensor for detecting whether the pressure of the urea pump after pressure build-up meets the injection requirement of the urea nozzle; and when the pressure after pressure build-up meets the injection requirement of the urea nozzle, the pressure is maintained.
S203: the non-injection time of the urea nozzle and the temperature at the injection hole of the urea nozzle are monitored.
In the present embodiment, the monitoring of the non-injection time of the urea injection nozzle may be performed by detecting a non-driving time of an injection valve of the urea injection nozzle.
The temperature of the urea nozzle spray hole is determined as the temperature of the urea nozzle spray hole according to the exhaust temperature collected by an upstream temperature sensor of the SCR system.
S204: and when the non-injection time exceeds a first preset time threshold value and the temperature at the injection hole of the urea nozzle exceeds a preset temperature interval, controlling the urea nozzle to inject urea.
In this embodiment, the first preset time threshold and the preset temperature interval may be calibrated according to an actual working condition of the urea nozzle.
When the non-injection time of the urea nozzle is within a first preset time threshold value and the temperature of the urea nozzle at the injection hole is within a preset temperature interval, the urea nozzle can normally work. When the non-injection time exceeds a first preset time threshold and the temperature at the injection hole of the urea nozzle exceeds a preset temperature interval, the probability of the urea nozzle failing is increased.
S205: and when detecting that the urea nozzle continuously injects urea to meet a second preset time threshold, stopping the urea nozzle from injecting urea.
In one embodiment of the present invention, the second predetermined time threshold may be calibrated by a temperature drop at a nozzle orifice of the urea nozzle as a function of injection time.
From the above description, this embodiment is through monitoring the time of not spouting of urea nozzle to and the temperature of urea nozzle jet orifice department, when not spouting the time and surpassing first preset time threshold value, and the temperature of urea nozzle jet orifice department surpasss when predetermineeing the temperature interval, control urea nozzle injection urea can realize the timely cooling of urea nozzle after the long-time inoperative in high temperature environment, avoid not spouting the condition that leads to the overheated damage of nozzle when urea solution for a long time under high temperature environment, improve urea nozzle's life.
Fig. 3 is a second schematic flow chart of a urea nozzle cooling protection control method according to an embodiment of the present invention, and this embodiment focuses on how to continue to ensure a timely cooling process at a urea nozzle injection hole within a period of time after a power-off of a whole vehicle based on the embodiment of fig. 2. As shown in fig. 3, after step S203, the method further includes:
s301: it is detected whether T15 is powered down. If T15 is powered down, go to step S302; if T15 is not powered down, step S204 is continued.
In this embodiment, powering off T15 is powering off the entire vehicle.
S302: acquiring the non-injection time of the urea nozzle before the power-off of T15 and the temperature of the urea nozzle at the injection hole before the power-off of T15; when the non-injection time before the power-off of T15 exceeds a first preset time threshold value and the temperature at the injection hole of the urea nozzle before the power-off of T15 exceeds a preset temperature interval, continuing to control the urea nozzle to inject urea, and finishing injection after the urea is injected in the Afterrun state and meets a third preset time threshold value.
In this embodiment, the third predetermined time threshold may be obtained by looking up a table based on the upstream temperature of the SCR system and the exhaust mass flow rate. Specifically, the upstream temperature may be obtained by an upstream temperature sensor of the SCR system, and the exhaust gas mass flow may be obtained by a mass flow sensor of the exhaust pipe.
Wherein the SCR controller after the after-afrerrun state is T15 power down continues to operate until a period of time when power is completely off, during which time data storage or other action may take place.
From the above description, whether the power is turned off or not is detected through T15, the power is turned off if the power is turned off through T15, whether the urea nozzle needs to be cooled or not is continuously judged after the power is turned off, it is guaranteed that the urea nozzle spray hole can be cooled in time after the power is turned off, and damage to the urea nozzle spray caused by the fact that the urea nozzle spray hole is in the process of being at high temperature for a long time after the power is turned off is avoided.
In an embodiment of the present invention, after step S205 or S308, the method may further include:
the steps of monitoring the non-injection time of the urea nozzle and the temperature at the injection hole of the urea nozzle are repeatedly performed.
Fig. 4 is a first schematic structural diagram of a urea nozzle cooling protection control device according to an embodiment of the present invention. As shown in fig. 4, the urea nozzle cooling protection control apparatus 40 includes: a pressure build-up detection module 401, a pressure build-up module 402, a monitoring module 403, and an injection control module 404.
A voltage build-up detection module 401, configured to detect whether the SCR system meets a voltage build-up condition;
the pressure building module 402 is used for controlling the SCR system to build pressure so that a urea nozzle enters a to-be-injected state when the SCR system is detected to meet a pressure building condition;
a monitoring module 403 for monitoring a non-injection time of the urea nozzle and a temperature at an injection hole of the urea nozzle;
the injection control module 404 is configured to control the urea nozzle to inject urea when the non-injection time exceeds a first preset time threshold and the temperature at the injection hole of the urea nozzle exceeds a preset temperature interval; and when detecting that the urea nozzle continuously injects urea to meet a second preset time threshold, stopping the urea nozzle from injecting urea.
The device provided in this embodiment may be used to implement the technical solution of the above method embodiment, and the implementation principle and technical effect are similar, which are not described herein again.
Fig. 5 is a schematic structural diagram ii of a urea nozzle cooling protection control device according to an embodiment of the present invention. As shown in fig. 5, this embodiment further includes, on the basis of the embodiment in fig. 4:
a power-off detection module 405, configured to detect whether T15 is powered off; if the power is turned off at T15, when the non-injection time before the power is turned off at T15 exceeds a first preset time threshold and the temperature at the injection hole of the urea nozzle before the power is turned off at T15 exceeds a preset temperature interval, continuing to control the urea nozzle to inject urea in an Afterrun state, and ending injection after the urea injection in the Afterrun state meets a third preset time threshold; and if the T15 is not powered down, continuing to execute the step of controlling the urea nozzle to inject the urea when the non-injection time exceeds a first preset time threshold and the temperature at the injection hole of the urea nozzle exceeds a preset temperature interval.
In an embodiment of the invention, the power-off detection module 405 is further configured to, after the procedure is ended after the after urea injection in the Afterrun state meets a third preset time threshold, repeatedly perform the step of detecting whether the SCR system meets the pressure build-up condition if T15 is powered on again.
In an embodiment of the present invention, the pressure build-up detection module 401 is specifically configured to detect whether an exhaust temperature of the engine reaches a set temperature value, and determine that the SCR system meets a pressure build-up condition if the exhaust temperature reaches the set temperature value.
In an embodiment of the present invention, the monitoring module 403 is specifically configured to receive, in real time, the temperature collected by the temperature sensor upstream of the SCR system.
The device provided in this embodiment may be used to implement the technical solution of the above method embodiment, and the implementation principle and technical effect are similar, which are not described herein again.
Fig. 1 is a schematic structural diagram of an SCR system according to an embodiment of the present invention. The SCR system includes: the SCR controller is connected with the urea pump, the urea nozzle, the SCR catalytic converter, the upstream temperature sensor and the downstream temperature sensor, the exhaust temperature collected by the upstream temperature sensor is determined as the temperature of the spray hole of the urea nozzle, and the temperature of the spray hole of the urea nozzle is fed back to the SCR controller. Fig. 6 is a schematic hardware structure diagram of an SCR controller according to an embodiment of the present invention. As shown in fig. 6, the SCR controller of the present embodiment includes: a processor 601 and a memory 602; wherein
A memory 602 for storing computer-executable instructions;
the processor 601 is configured to execute computer-executable instructions stored in the memory to implement the steps performed by the SCR controller in the above embodiments. Reference may be made in particular to the description relating to the method embodiments described above.
Alternatively, the memory 602 may be separate or integrated with the processor 601.
When the memory 602 is provided separately, the SCR controller further includes a bus 603 for connecting the memory 602 and the processor 601.
Embodiments of the present invention further provide a computer-readable storage medium, where computer-executable instructions are stored, and when a processor executes the computer-executable instructions, the method for controlling cooling protection of a urea nozzle as described above is implemented.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules is only one logical division, and other divisions may be realized in practice, for example, a plurality of modules may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to implement the solution of the present embodiment.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing unit, or each module may exist alone physically, or two or more modules are integrated into one unit. The unit formed by the modules can be realized in a hardware form, and can also be realized in a form of hardware and a software functional unit.
The integrated module implemented in the form of a software functional module may be stored in a computer-readable storage medium. The software functional module is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor to execute some steps of the methods described in the embodiments of the present application.
It should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.
The memory may comprise a high-speed RAM memory, and may further comprise a non-volatile storage NVM, such as at least one disk memory, and may also be a usb disk, a removable hard disk, a read-only memory, a magnetic or optical disk, etc.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (Extended Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
The storage medium may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the storage medium may reside as discrete components in an electronic device or host device.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A urea nozzle cooling protection control method is characterized by comprising the following steps:
detecting whether the selective catalytic reduction SCR system meets a pressure building condition;
when the SCR system is detected to meet the pressure building condition, controlling the SCR system to build pressure so that the urea nozzle enters a to-be-sprayed state;
monitoring the non-injection time of the urea nozzle and the temperature at the injection hole of the urea nozzle;
when the non-injection time exceeds a first preset time threshold and the temperature at the injection hole of the urea nozzle exceeds a preset temperature interval, controlling the urea nozzle to inject urea;
when detecting that the urea nozzle continuously injects urea to meet a second preset time threshold, stopping the urea nozzle from injecting urea;
after monitoring the non-injection time of the urea nozzle and the temperature at the injection hole of the urea nozzle, the method further comprises the following steps:
detecting whether the T15 is powered down;
if the power is turned off at T15, when the non-injection time before the power is turned off at T15 exceeds a first preset time threshold and the temperature at the injection hole of the urea nozzle before the power is turned off at T15 exceeds a preset temperature interval, continuing to control the urea nozzle to inject urea in an Afterrun state, and ending injection after the urea injection in the Afterrun state meets a third preset time threshold;
and if the T15 is not powered off, continuing to execute the step of controlling the urea nozzle to spray urea when the non-injection time exceeds a first preset time threshold and the temperature at the injection hole of the urea nozzle exceeds a preset temperature interval, wherein the power off of the T15 is the power off of the whole vehicle.
2. The method of claim 1, wherein after ending the process after the Afterrun state urea injection satisfies a third preset time threshold, further comprising:
if the power is turned on again at T15, the step of detecting whether the SCR system meets the voltage build-up condition is repeated.
3. The method of claim 1, wherein the detecting whether the Selective Catalytic Reduction (SCR) system meets a pressure build condition comprises:
and detecting whether the exhaust temperature of the engine reaches a set temperature value or not, and if so, determining that the SCR system meets the pressure building condition.
4. The method of claim 1, wherein monitoring the temperature at the urea nozzle orifice comprises:
and receiving the temperature collected by the upstream temperature sensor of the SCR system in real time.
5. The method of claim 1, wherein after stopping the urea nozzle from injecting urea upon detecting that the urea nozzle continues to inject urea for a second predetermined time threshold, further comprising:
the steps of monitoring the non-injection time of the urea nozzle and the temperature at the injection hole of the urea nozzle are repeatedly performed.
6. A urea nozzle cooling protection control apparatus, comprising:
the voltage build-up detection module is used for detecting whether the SCR system meets a voltage build-up condition;
the pressure building module is used for controlling the SCR system to build pressure so that a urea nozzle enters a to-be-sprayed state when the SCR system is detected to meet a pressure building condition;
the monitoring module is used for monitoring the non-injection time of the urea nozzle and the temperature at the injection hole of the urea nozzle;
the injection control module is used for controlling the urea nozzle to inject urea when the non-injection time exceeds a first preset time threshold and the temperature at the injection hole of the urea nozzle exceeds a preset temperature interval; when detecting that the urea nozzle continuously injects urea to meet a second preset time threshold, stopping the urea nozzle from injecting urea;
the power-off detection module is used for detecting whether the power is off or not by T15 after the non-injection time of the urea nozzle and the temperature at the injection hole of the urea nozzle are monitored; if the power is turned off at T15, when the non-injection time before the power is turned off at T15 exceeds a first preset time threshold and the temperature at the injection hole of the urea nozzle before the power is turned off at T15 exceeds a preset temperature interval, continuing to control the urea nozzle to inject urea in an Afterrun state, and ending injection after the urea injection in the Afterrun state meets a third preset time threshold; and if the T15 is not powered off, continuing to execute the step of controlling the urea nozzle to spray urea when the non-injection time exceeds a first preset time threshold and the temperature at the injection hole of the urea nozzle exceeds a preset temperature interval, wherein the power off of the T15 is the power off of the whole vehicle.
7. An SCR system, comprising: the SCR temperature control device comprises an SCR controller, a urea pump, a urea nozzle, an SCR catalytic converter, an upstream temperature sensor and a downstream temperature sensor, wherein the SCR controller is connected with the urea pump, the urea nozzle, the SCR catalytic converter, the upstream temperature sensor and the downstream temperature sensor;
the SCR controller comprises at least one processor and a memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory cause the at least one processor to perform the urea nozzle cooling protection control method of any of claims 1-5.
8. A computer readable storage medium having computer executable instructions stored thereon which, when executed by a processor, implement a urea nozzle cooling protection control method as claimed in any one of claims 1 to 5.
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| CN113090369A (en) * | 2021-05-14 | 2021-07-09 | 潍柴动力股份有限公司 | Method and device for protecting urea nozzle |
| CN114645755B (en) * | 2021-05-21 | 2023-05-30 | 长城汽车股份有限公司 | Urea injection control method and device, storage medium, electronic equipment and vehicle |
| CN113356975B (en) * | 2021-06-24 | 2022-04-05 | 潍柴动力股份有限公司 | Urea nozzle protection method |
| CN114738092B (en) * | 2022-05-05 | 2023-06-30 | 一汽解放汽车有限公司 | Temperature control method and experimental method for urea nozzle |
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| US20140322088A1 (en) * | 2014-07-10 | 2014-10-30 | Perkins Engines Company Limited | Auxiliary coolant tank for exhaust aftertreatment system |
| CN105986864B (en) * | 2015-01-05 | 2019-05-17 | 浙江福爱电子有限公司 | A kind of SCR spraying system |
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