CN110230530B - Method, device and system for heating engine SCR system pipeline - Google Patents

Method, device and system for heating engine SCR system pipeline Download PDF

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Publication number
CN110230530B
CN110230530B CN201910579186.3A CN201910579186A CN110230530B CN 110230530 B CN110230530 B CN 110230530B CN 201910579186 A CN201910579186 A CN 201910579186A CN 110230530 B CN110230530 B CN 110230530B
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urea
engine
heating
pipeline
filling rate
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CN110230530A (en
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朱娟
胡金金
张硕
张苏苏
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • 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]
    • 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
    • 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
    • F01N2610/1486—Means to prevent the substance from freezing
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention provides a method, a device and a system for heating an engine SCR system pipeline, wherein the method comprises the following steps: obtaining the engine stop time and the urea filling rate; detecting whether the engine stop time or the urea filling rate meets corresponding preset conditions or not; and if the engine is stopped for a certain time or the urea filling rate meets corresponding preset conditions, starting a urea pipeline for heating. The heating accuracy of the urea pipeline is improved, extra hardware is not needed, and the waiting time of pressure build-up of the SCR system is shortened; thereby prolonging the service life of the urea pipeline of the SCR system.

Description

Method, device and system for heating engine SCR system pipeline
Technical Field
The invention relates to the technical field of engine tail gas treatment, in particular to a method, a device and a system for heating an engine SCR system pipeline.
Background
The successful application of the electronic control technology to the diesel engine realizes the reasonable emission of the tail gas of the diesel engine. For example, with SCR systems, the system can treat PM and NOx emitted from diesel engines, and the like.
The SCR technology has simpler reaction conditions and convenient use. The SCR system mainly comprises a urea box, a urea injection system and a catalytic reaction device. In the SCR technology, a urea solution is injected into an SCR box, and under the action of a catalyst and the temperature of exhaust gas, ammonia (NH3) released by the urea solution and NOx in the exhaust gas are subjected to reduction reaction to generate N2, so that the emission of the NOx is reduced. At present, a heating device of an SCR system can arrange an engine coolant pipeline in a urea box; a heating device can be arranged on the urea pump; heating devices can also be arranged on the urea pressure pipe, the urea return pipe and the urea liquid suction pipe.
However, the urea solution in the urea tank begins to crystallize at about minus 11 ℃, which may cause the pipeline of the SCR system to be blocked, and the urea nozzle may not work normally, thereby affecting the emission of the diesel engine. In addition, whether the SCR urea pipeline needs to be heated or not is judged only according to the ambient temperature, the heating requirement exists as long as the ambient temperature is low, and the heating energy consumption is caused without considering the condition that the SCR urea pipeline does not need to be heated.
Disclosure of Invention
The invention provides a method, a device and a system for heating a pipeline of an engine SCR system, which are used for improving the accuracy of urea pipeline heating, needing no additional hardware and shortening the waiting time of pressure build-up of the SCR system; thereby prolonging the service life of the urea pipeline of the SCR system.
In a first aspect, an embodiment of the present invention provides a method for heating a pipeline of an engine SCR system, including:
obtaining the engine stop time and the urea filling rate;
detecting whether the engine stop time or the urea filling rate meets corresponding preset conditions or not;
and if the engine is stopped for a certain time or the urea filling rate meets corresponding preset conditions, starting a urea pipeline for heating.
In one possible design, detecting whether the engine off time, or the urea fill rate, meets a corresponding preset condition includes:
and judging whether the engine stop time meets a first preset condition or whether the urea filling rate in a pipeline meets a second preset condition.
In one possible design, further comprising:
when the urea filling rate meets the second preset condition, detecting whether the environmental temperature is lower than the urea crystallization temperature;
if the environment temperature is lower than the urea crystallization temperature, detecting whether the engine stop time meets a first preset condition;
and if the engine stopping time meets a first preset condition, heating the urea pipeline.
In one possible design, further comprising:
when the engine stopping time meets the first preset condition, acquiring the driving duty ratio of the resistance wire according to the engine stopping time;
and sequencing the driving duty ratios from small to large, and stopping heating the urea pipeline when the driving duty ratio of the resistance wire is minimum.
In a second aspect, an embodiment of the present invention provides an apparatus for heating a pipeline of an engine SCR system, including:
the acquisition module is used for acquiring the engine stop time and the urea filling rate;
the detection module is used for detecting whether the engine stop time or the urea filling rate meets corresponding preset conditions or not;
and the heating module is used for starting a urea pipeline for heating if the engine is stopped for a while or the urea filling rate meets corresponding preset conditions.
In one possible design, the detection module is specifically configured to:
and judging whether the engine stop time meets a first preset condition or whether the urea filling rate in a pipeline meets a second preset condition.
In one possible design, further comprising:
when the urea filling rate meets the second preset condition, detecting whether the environmental temperature is lower than the urea crystallization temperature;
if the environment temperature is lower than the urea crystallization temperature, detecting whether the engine stop time meets a first preset condition;
and if the engine stopping time meets a first preset condition, heating the urea pipeline.
In one possible design, further comprising:
when the engine stopping time meets the first preset condition, acquiring the driving duty ratio of the resistance wire according to the engine stopping time;
and sequencing the driving duty ratios from small to large, and stopping heating the urea pipeline when the driving duty ratio of the resistance wire is minimum.
In a third aspect, an embodiment of the present invention provides a system for heating a pipeline of an engine SCR system, including: the device comprises a memory and a processor, wherein the memory stores executable instructions of the processor; wherein the processor is configured to perform the method of engine SCR system circuit heating of any of the first aspect via execution of the executable instructions.
In a fourth aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the method for heating the SCR system pipe of the engine according to any one of the first aspect.
The invention provides a method, a device and a system for heating an engine SCR system pipeline, wherein the method comprises the following steps: obtaining the engine stop time and the urea filling rate; detecting whether the engine stop time or the urea filling rate meets corresponding preset conditions or not; and if the engine is stopped for a certain time or the urea filling rate meets corresponding preset conditions, starting a urea pipeline for heating. The heating accuracy of the urea pipeline is improved, extra hardware is not needed, and the waiting time of pressure build-up of the SCR system is shortened; thereby prolonging the service life of the urea pipeline of the SCR system.
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 flow chart of a method for heating an engine SCR system pipe according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method for heating an engine SCR system pipe according to a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a device for heating a pipeline of an engine SCR system according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a pipeline heating of an engine SCR system according to a fourth 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.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical solution of the present invention and how to solve the above technical problems will be described in detail with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present invention will be described below with reference to the accompanying drawings.
As the atmospheric environment deteriorates, the emission requirements for vehicles become increasingly stringent. SCR aftertreatment systems have found widespread use as effective reductions in nitrogen oxides in exhaust gases. Selective Catalytic Reduction (SCR) utilizes urea to decompose to produce NH3, and ammonia reacts with NOx over a catalyst to reduce NOx emissions in the exhaust. The SCR system comprises an ammonia supply system, an ammonia/air injection system, a catalytic reaction system, a control system and the like, wherein the ammonia/air injection is realized by a urea pump, and the urea pump sucks urea out of a urea box and conveys the urea to a nozzle system at a certain pressure in a fixed time and a fixed quantity mode. The SCR system is applied to the exhaust aftertreatment of the diesel engine, and can effectively control and meet the emission requirements aiming at the emissions of carbon monoxide, hydrocarbon, particles and the like in the exhaust gas.
Aiming at the defects in the prior art, when the environmental temperature is lower, the SCR system can work normally, three pipelines of a urea pressure pipe, a urea return pipe and a urea liquid suction pipe of the SCR system need to be heated and unfrozen, frozen urea is not contained in the pipelines, and the pipelines are smooth.
Fig. 1 is a flowchart of a method for heating a pipeline of an engine SCR system according to an embodiment of the present invention, and as shown in fig. 1, the method for heating a pipeline of an engine SCR system according to the present embodiment may include:
and S101, obtaining the engine stop time and the urea filling rate.
In particular, the SCR system of a diesel engine functions to remove NOx from the exhaust of the diesel engine. The system uses urea as a reducing agent (also known as bluing), and NOx is reduced to nitrogen and water under the reducing action of a catalyst. The SCR system may include a urea aqueous solution storage tank, a delivery device, a metering device, an injection device, a catalyst, and temperature and exhaust sensors, among others. The heating device of the SCR system can arrange an engine coolant pipeline in the urea box; a heating device can be arranged on the urea pump; heating resistance wires can be arranged on the urea pressure pipe, the urea return pipe and the urea liquid suction pipe for heating.
In this embodiment, when the engine is stopped, a time difference may be calculated according to the time from the key-on time to the key-off time of the vehicle to obtain a data value corresponding to the engine stop time, for example, the engine stop time is equal to the key-off time and the key-on time, that is, the engine stop time is tClosing device-tOpening device(ii) a Can be started according to the indicating lamp of the vehicle engineCalculating the time difference between the turning-on time and the turning-off time to obtain a data value corresponding to the stopping time, for example, the stopping time is equal to the turning-off time and the turning-on time of the indicator light, i.e., the stopping time is tClosing device-tOpening device。
In an alternative embodiment, the engine cannot be immediately shut down after a long period of high-speed operation, because when the engine is in operation, a part of engine oil is supplied to the bearing lubrication of the turbocharger rotor and used for cooling, if the engine pressure drops to zero rapidly after the engine in operation is suddenly stopped, the engine oil lubrication is interrupted, the heat in the turbocharger cannot be taken away by the engine oil, the high temperature of the turbocharger turbine part can be transmitted to the middle, the heat in the bearing supporting shell cannot be taken away rapidly, and meanwhile, the turbocharger rotor still rotates at high speed under the inertia effect, so that the bearing and the shaft can be damaged due to the 'seizure' between the rotating shaft and the shaft sleeve of the turbocharger. In addition, after the engine suddenly stops, the temperature of the exhaust manifold is high at the moment, the heat of the exhaust manifold is absorbed to the shell of the turbocharger, and the engine oil staying in the turbocharger is boiled into carbon deposits. When the carbon deposit is more, the oil inlet is blocked, so that the shaft sleeve is lack of oil, and the abrasion between the turbine rotating shaft and the shaft sleeve is accelerated. Therefore, the engine should be idling for about three minutes before shutting down, so that the rotating speed of the rotor of the turbocharger is reduced. In addition, turbocharged engines are also not suitable for long idle times and should generally be kept within 10 minutes. Therefore, the specific corresponding data value of the stop time can be calculated and obtained according to the fact that the engine is below the preset torque threshold value of the torque and lasts for the preset time length. And calculating to obtain a data value specifically corresponding to the shutdown time according to the fact that the rotating speed of the engine is below a preset rotating speed threshold value and the set duration is continued.
In this embodiment, when the vehicle normally works and no fault occurs in the system for heating the engine SCR system pipeline, and the SCR system enters the suck-back process, the urea liquid is evacuated by using the reverse valve of the urea pump, so that the urea filling rate is 0, and adverse effect of residual urea in the pipeline on the engine SCR system is prevented.
S102, detecting whether the engine stop time or the urea filling rate meets the corresponding preset conditions.
Specifically, under the condition that the vehicle normally works, a system for heating an engine SCR system pipeline detects a data value corresponding to the engine stop time. For example, a data value corresponding to the shutdown time is obtained through calculation according to the use state of a vehicle key, or a data value corresponding to the shutdown time is obtained through calculation according to the use state of a vehicle engine starting indicator lamp, wherein if the engine shutdown time is greater than or equal to a preset shutdown time threshold value, the shutdown time meets a corresponding preset condition, and a urea pipeline needs to be started for heating.
Or detecting whether the urea filling rate is greater than 0, and if the urea filling rate is greater than 0, meeting the corresponding preset condition. And if the urea filling rate stored in the previous driving cycle is read, when the urea filling rate is greater than 0, the fact that the reverse suction of the SCR system is not completely emptied is indicated, the urea pipeline needs to be heated in the current driving cycle, and the driving duty ratio of the heating wire is greater than 0.
In the embodiment, whether the urea pipeline needs to be heated is judged by acquiring multiple factors such as the engine stop time and the urea filling rate, the situation that whether the urea pipeline needs to be heated is judged based on a single factor such as the environmental temperature is broken through, and the accuracy rate of heating the urea pipeline is improved.
And S103, if the engine is stopped for a certain time or the urea filling rate meets the corresponding preset conditions, starting a urea pipeline for heating.
In this embodiment, when the engine downtime is detected to be greater than or equal to the preset downtime threshold value under the condition that no fault occurs during normal operation of the vehicle, the downtime meets the corresponding preset condition, and the urea pipeline is started to heat. Or if the detected urea filling rate is greater than 0, the urea filling rate stored in the previous driving cycle is greater than 0, and the urea filling rate stored in the previous driving cycle is greater than 0, the SCR system is not sucked and emptied completely, the urea pipeline needs to be heated in the current driving cycle, and the heating wire driving duty ratio is also greater than 0.
In an alternative embodiment, detecting whether the engine off time, or the urea fill rate, meets a corresponding preset condition comprises:
and judging whether the engine stop time meets a first preset condition or whether the urea filling rate in the pipeline meets a second preset condition.
Specifically, under the condition that the vehicle normally works, a system for heating the engine SCR system pipeline detects data values corresponding to engine stop time, urea filling rate and the like, and detects whether corresponding preset conditions are met, wherein whether the engine stop time meets a first preset condition or whether the urea filling rate meets a second preset condition. The first preset condition is whether the engine stop time is greater than or equal to a preset stop time threshold, and the second preset condition is whether the urea filling rate is greater than 0. In an alternative embodiment, the preset downtime threshold may be 10 minutes, which is not limited in this embodiment.
For example, when the environmental temperature is low, a data value corresponding to the shutdown time is obtained through calculation according to the use state of a vehicle key, or a data value corresponding to the shutdown time is obtained through calculation according to the use state of a vehicle engine starting indicator lamp, if the detected engine shutdown time is greater than or equal to a preset shutdown time threshold value, the shutdown time meets a corresponding preset condition, and a urea pipeline needs to be started for heating. Or detecting that the urea filling rate is greater than 0, and then meeting the corresponding preset condition. The urea filling rate stored in the previous driving cycle is read, when the urea filling rate is larger than 0, the fact that the SCR system does not suck backwards and empty completely is indicated, the urea pipeline needs to be heated in the current driving cycle, and the heating wire driving duty ratio is larger than 0.
According to the embodiment, the heating accuracy of the urea pipeline can be improved, additional hardware is not required, and the waiting time for pressure build-up of the SCR system is shortened; thereby prolonging the service life of the urea pipeline of the SCR system.
In an alternative embodiment, when the urea filling rate meets a second preset condition, detecting whether the ambient temperature is lower than the urea crystallization temperature; if the environment temperature is lower than the urea crystallization temperature, detecting whether the engine shutdown time meets a first preset condition; and if the shutdown time of the engine meets a first preset condition, heating the urea pipeline.
Specifically, a system for heating a pipeline of an engine SCR system detects whether the ambient temperature is lower than the urea crystallization temperature or not through an ECU (Electronic Control Unit) when the urea filling rate meets a second preset condition, and further detects whether the engine shutdown time meets a first preset condition or not if the ambient temperature is lower than the urea crystallization temperature; heating the urea pipeline if the engine stop time meets a first preset condition, wherein the first preset condition is whether the engine stop time is greater than or equal to a preset stop time threshold, for example, the preset stop time threshold may be 10 minutes; the second preset condition is whether the urea fill rate is greater than 0.
In this embodiment, after the vehicle ECU is powered on, the urea fill rate stored in the previous driving cycle is read. When the urea filling rate is larger than zero, the SCR system of the previous driving cycle is not sucked and emptied completely, and the urea pipeline needs to be heated in the current driving cycle. If the detection environment temperature is lower than the urea crystallization temperature, whether the engine shutdown time meets a first preset condition is further detected, if the engine shutdown time is longer than 10 minutes, the urea pipeline is heated, and duty ratio driving is carried out according to the engine shutdown time.
According to the embodiment, whether the engine shutdown time meets a first preset condition or whether the urea filling rate meets a second preset condition is judged, so that the accuracy of urea pipeline heating can be improved, additional hardware is not required, and the waiting time for pressure build-up of an SCR system is shortened; thereby prolonging the service life of the urea pipeline of the SCR system.
In an optional embodiment, further comprising: when the engine stop time meets a first preset condition, acquiring the driving duty ratio of the resistance wire according to the engine stop time; and sequencing the driving duty ratios from small to large, and stopping heating the urea pipeline when the driving duty ratio of the resistance wire is minimum.
Specifically, under the normal working condition of a vehicle, after an ECU is powered on, when the engine downtime meets a first preset condition, the heating resistance wire of the SCR system pipeline is controlled through a calibration mode, when the engine downtime is smaller than or equal to a preset downtime threshold, the heating function of the resistance wire does not need to be started, when the engine downtime is larger than the preset downtime threshold, the heating condition of the current heating resistance wire obtains the driving duty ratio of the resistance wire according to the engine downtime, the driving duty ratios are sequenced from small to large according to time segmentation, the driving duty ratio of the resistance wire is calibrated from small to large, the required heat is minimized, namely the heating of the urea pipeline is stopped when the driving duty ratio of the resistance wire is minimized. In an optional embodiment, the heating condition of the urea pipeline is different according to different conditions, so that the resistance wire driving duty ratio is not fixed when the resistance wire driving duty ratio is minimum, and the limitation can be carried out according to specific conditions, so that a better effect is achieved.
In the embodiment, under the condition that the normal back suction and emptying of the SCR tail gas post-treatment system are finished, when the urea pipeline of the SCR system does not need to be heated or the required heat is less, the heating resistance wire stops working or the driving duty ratio is reduced, the urea pipeline heating strategy can be optimized, the waiting time for the pressure build-up of the SCR system is shortened, and the service life of the heating resistance wire is prolonged; the accuracy of heating the urea pipeline can be improved.
Fig. 2 is a flowchart of a method for heating a pipeline of an engine SCR system according to a second embodiment of the present invention, as shown in fig. 2, in this embodiment, when a vehicle is not in a fault during normal operation, an ECU (Electronic control unit) detects whether an engine shutdown time meets a first preset condition and a urea filling rate meets a second preset condition; the first preset condition is whether the engine stop time is larger than or equal to a preset stop time threshold value, and the second preset condition is whether the urea filling rate is larger than 0. For example, the preset downtime threshold may be 10 minutes. If the shutdown time meets a first preset condition and the urea filling rate is greater than 0, the urea pipeline needs to be heated, and the driving duty ratio of the heating resistance wire is greater than 0. And then judging whether the ambient temperature is lower than the urea crystallization temperature, if the ambient temperature is lower than the urea crystallization temperature, for example, the ambient temperature is 5 ℃, inquiring the CUR according to the current downtime which is larger than the preset downtime obtained through detection, obtaining the driving duty ratio of the resistance wire, if the duty ratio is larger than 0, heating the urea pipe all the time, calibrating the driving duty ratio of the resistance wire from small to large according to the time segmentation order of the driving duty ratio from small to large, and stopping heating the urea pipe when the required heat is minimum, namely the driving duty ratio of the resistance wire is minimum. The heating condition of the urea pipeline is also different according to different conditions, so that the resistance wire driving duty ratio is not fixed when the minimum is achieved, and the limitation can be carried out according to specific conditions.
Referring to fig. 2, in an alternative embodiment, when the current shutdown time satisfies the first preset condition but the urea filling rate is not greater than 0, it is determined that the urea line does not need to be heated; or when the environmental temperature is judged to be not lower than the urea crystallization temperature, the urea pipeline is also judged not to need to be heated; or in the heating process of the urea pipeline, when the driving duty ratio of the detection resistance wire is not more than 0, the heating of the urea pipeline is stopped. And if the system for heating the engine SCR system pipeline detects any or any more situations that the urea pipeline does not need to be heated, stopping heating the urea pipeline.
The embodiment can optimize the heating strategy of the urea pipeline, shorten the waiting time of the pressure build-up of the SCR system and prolong the service life of the heating resistance wire; the accuracy of heating the urea pipeline can be improved.
Fig. 3 is a schematic structural diagram of an engine SCR system pipe heating device according to a third embodiment of the present invention, and as shown in fig. 3, the engine SCR system pipe heating device according to this embodiment may include
An obtaining module 21, configured to obtain engine shutdown time and a urea filling rate;
the detection module 22 is used for detecting whether the engine stop time or the urea filling rate meets the corresponding preset conditions;
and the heating module 23 is used for starting the urea pipeline for heating if the engine is stopped for a certain time or the urea filling rate meets corresponding preset conditions.
In an alternative embodiment, the detection module 22 is specifically configured to:
and judging whether the engine stop time meets a first preset condition or whether the urea filling rate in the pipeline meets a second preset condition.
In an optional embodiment, further comprising:
when the urea filling rate meets a second preset condition, detecting whether the environmental temperature is lower than the urea crystallization temperature;
if the environment temperature is lower than the urea crystallization temperature, detecting whether the engine shutdown time meets a first preset condition;
and if the shutdown time of the engine meets a first preset condition, heating the urea pipeline.
In an optional embodiment, further comprising:
when the engine stop time meets a first preset condition, acquiring the driving duty ratio of the resistance wire according to the engine stop time;
and sequencing the driving duty ratios from small to large, and stopping heating the urea pipeline when the driving duty ratio of the resistance wire is minimum.
The device for heating the engine SCR system pipeline of the present embodiment may implement the technical solutions in the methods shown in fig. 1 and fig. 2, and the specific implementation process and technical principles thereof refer to the related descriptions in the methods shown in fig. 1 and fig. 2, and are not described herein again.
Fig. 4 is a schematic structural diagram of a pipeline heating system of an engine SCR system according to a fourth embodiment of the present invention, and as shown in fig. 4, a system 30 for heating a pipeline of an engine SCR system according to the present embodiment may include: a processor 31 and a memory 32.
A memory 32 for storing computer programs (e.g., applications, functional modules, etc. that implement the above-described engine SCR system circuit heating methods), computer instructions, etc.;
the computer programs, computer instructions, etc. described above may be stored in one or more memories 32 in partitions. And the above-mentioned computer program, computer instructions, data, etc. can be called by the processor 31.
A processor 31 for executing the computer program stored in the memory 32 to implement the steps of the method according to the above embodiments.
Reference may be made in particular to the description relating to the preceding method embodiment.
The processor 31 and the memory 32 may be separate structures or may be integrated structures integrated together. When the processor 31 and the memory 32 are separate structures, the memory 32 and the processor 31 may be coupled by a bus 33.
The server in this embodiment may execute the technical solutions in the methods shown in fig. 1 and fig. 2, and the specific implementation process and technical principle of the server refer to the relevant descriptions in the methods shown in fig. 1 and fig. 2, which are not described herein again.
In addition, embodiments of the present application further provide a computer-readable storage medium, in which computer-executable instructions are stored, and when at least one processor of the user equipment executes the computer-executable instructions, the user equipment performs the above-mentioned various possible methods.
Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. 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 ASIC. Additionally, the ASIC may reside in user equipment. Of course, the processor and the storage medium may reside as discrete components in a communication 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 (7)

1. A method of engine SCR system circuit heating, comprising:
obtaining the engine stop time and the urea filling rate;
detecting whether the engine stop time or the urea filling rate meets corresponding preset conditions or not;
if the engine is stopped for a certain time or the urea filling rate meets corresponding preset conditions, starting a urea pipeline for heating;
wherein detecting whether the engine stop time or the urea filling rate satisfies a corresponding preset condition comprises:
judging whether the engine stopping time meets a first preset condition or whether the urea filling rate in a pipeline meets a second preset condition;
further comprising:
when the urea filling rate meets the second preset condition, detecting whether the environmental temperature is lower than the urea crystallization temperature;
if the environment temperature is lower than the urea crystallization temperature, detecting whether the engine stop time meets a first preset condition;
and if the engine stopping time meets a first preset condition, heating the urea pipeline.
2. The method of claim 1, further comprising:
when the engine stopping time meets the first preset condition, obtaining the driving duty ratio of the resistance wire according to the engine stopping time and the urea filling rate;
and when the driving duty ratio is 0%, stopping heating the urea pipeline.
3. The method of claim 1, further comprising:
when the urea filling rate is greater than 0, the engine stopping time meets the first preset condition, and the environmental temperature is lower than the urea crystallization temperature, heating the urea pipeline;
obtaining the driving duty ratio of the resistance wire according to the engine stop time and the urea filling rate,
and when the driving duty ratio is 0%, stopping heating the urea pipeline.
4. An apparatus for heating an engine SCR system pipe, comprising:
the acquisition module is used for acquiring the engine stop time and the urea filling rate;
the detection module is used for detecting whether the engine stop time or the urea filling rate meets corresponding preset conditions or not;
the heating module is used for starting a urea pipeline for heating if the engine is stopped for a while or the urea filling rate meets corresponding preset conditions;
wherein, the detection module is specifically configured to:
judging whether the engine stopping time meets a first preset condition or whether the urea filling rate in a pipeline meets a second preset condition;
further comprising:
when the urea filling rate meets the second preset condition, detecting whether the environmental temperature is lower than the urea crystallization temperature;
if the environment temperature is lower than the urea crystallization temperature, detecting whether the engine stop time meets a first preset condition;
and if the engine stopping time meets a first preset condition, heating the urea pipeline.
5. The apparatus of claim 4, further comprising:
when the engine stopping time meets the first preset condition, obtaining the driving duty ratio of the resistance wire according to the engine stopping time and the urea filling rate;
and when the driving duty ratio is switched to 0, stopping heating the urea pipeline.
6. The apparatus of claim 4, further comprising:
when the urea filling rate is greater than 0, the engine stopping time meets the first preset condition, and the environmental temperature is lower than the urea crystallization temperature, heating the urea pipeline;
obtaining the driving duty ratio of the resistance wire according to the engine stop time and the urea filling rate,
and when the driving duty ratio is 0%, stopping heating the urea pipeline.
7. A system for heating an engine SCR system pipe, comprising: the device comprises a memory and a processor, wherein the memory stores executable instructions of the processor; wherein the processor is configured to perform the method of engine SCR system circuit heating of claims 1 or 3 via execution of the executable instructions.
CN201910579186.3A 2019-06-28 2019-06-28 Method, device and system for heating engine SCR system pipeline Active CN110230530B (en)

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