WO2023125819A1 - 尿素泵、尿素泵的控制方法及控制系统 - Google Patents

尿素泵、尿素泵的控制方法及控制系统 Download PDF

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Publication number
WO2023125819A1
WO2023125819A1 PCT/CN2022/143428 CN2022143428W WO2023125819A1 WO 2023125819 A1 WO2023125819 A1 WO 2023125819A1 CN 2022143428 W CN2022143428 W CN 2022143428W WO 2023125819 A1 WO2023125819 A1 WO 2023125819A1
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Prior art keywords
urea
pump
urea pump
threshold
instant
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PCT/CN2022/143428
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English (en)
French (fr)
Inventor
安丽花
刘伟达
李俊普
李国朋
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潍柴动力股份有限公司
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Priority to US18/276,919 priority Critical patent/US20240125262A1/en
Publication of WO2023125819A1 publication Critical patent/WO2023125819A1/zh

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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]
    • 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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • 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
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F01N2610/105—Control thereof
    • 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
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F01N2610/107—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance using glow plug heating elements
    • 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
    • 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
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • 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
    • F01N2610/1426—Filtration means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433—Pumps
    • 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
    • F01N2610/1433—Pumps
    • F01N2610/144—Control thereof
    • 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
    • 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
    • F01N2610/1493—Purging the reducing agent out of the conduits or nozzle
    • 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
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1808—Pressure
    • 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
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1811—Temperature
    • 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
    • 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

Definitions

  • the present application relates to the technical field of vehicle exhaust treatment, for example, to a urea pump, a control method and a control system for the urea pump.
  • the urea pump is the core component of the SCR (Selective Catalytic Reduction, catalytic reduction technology) urea injection system. Through the urea pump, urea can be delivered to the urea nozzle under a certain pressure, and the required injection amount can be accurately executed to ensure that the emission meets the regulatory requirements.
  • SCR Selective Catalytic Reduction, catalytic reduction technology
  • the main function of the current urea pump is to provide urea with a certain pressure to the urea nozzle.
  • the urea can be successfully thawed, but it cannot provide urea with a higher temperature.
  • the atomization is not good, which is easy to cause crystallization. question. If the urea is heated before entering the urea pump, the urea is easily spoiled, resulting in low conversion efficiency and the formation of unwanted chemical components.
  • the present application provides a urea pump, a control method and a control system for the urea pump, which can solve the problem of poor atomization of normal-temperature urea after it is sprayed from a nozzle to an assembly, which easily leads to crystallization.
  • a urea pump in the first aspect of the present application, includes: a liquid inlet pipeline; connected, used to filter and heat the urea solution flowing in through the liquid inlet pipeline; a pressure building pump, the pressure built pump is arranged on the liquid inlet pipeline, and is used to drive the flow through the liquid inlet pipeline to the The urea solution of the instant filter device; the liquid outlet pipeline, which is in communication with the first outlet of the instant filter device, and is used to transport the filtered and heated urea solution to the nozzle; the return liquid pipeline, the liquid return pipeline communicates with the second outlet of the instant filter device, and is used to return the urea solution in the urea pump to the urea tank after shutdown.
  • the urea solution can be filtered through an instant filter device, and the urea solution is heated to a first preset temperature, so that the urea solution has a higher temperature, And immediately spray out through the liquid outlet pipeline and nozzle, so that the urea solution is sprayed from the nozzle at a higher temperature, improving the atomization effect of the urea solution and reducing the probability of crystallization of the urea solution.
  • the urea solution is sprayed out of the nozzle immediately after being heated by the instant filter device, and the higher temperature urea solution stays in the urea pump for a short time, which reduces the degree of deterioration of the urea solution and reduces the generation of unnecessary chemicals. Composition, to ensure that the urea solution has a high conversion rate after being sprayed from the nozzle.
  • urea pump according to the present application may also have the following additional technical features:
  • the instant filter device includes: a housing, a cavity is arranged in the housing; a filter element, filling the cavity, is used to filter the urea flowing through the cavity solution; the electric heating element is arranged in the cavity and is used to heat the urea solution flowing into the cavity; the liquid inlet pipeline, the liquid return pipeline and the liquid outlet pipeline are all connected with the The cavities are connected.
  • the liquid return line includes a main line and a first branch and a second branch parallel to the main line; the urea pump further includes: an overflow valve, located on the first One branch; the back pump is arranged on the second branch; the pressure sensor is arranged on the outlet pipeline.
  • a urea pump control method which is used to control the operation of the urea pump described in the technical solution of the first aspect, and the control method includes:
  • the device is operated for a first period of time and heated to a first preset temperature.
  • the control method of the urea pump proposed in the application by controlling the instant filter device to run for a first period of time and heating to the first preset temperature according to the injection demand, it is ensured that the instant filter device can pass through it
  • the internal urea solution is heated to the first preset temperature, so that the urea solution is sprayed from the nozzle at the first preset temperature, so that the urea solution is sprayed from the nozzle at a higher temperature, and the atomization effect of the urea solution is improved And reduce the probability of crystallization of urea solution.
  • the thermal filter device before controlling the pressure building pump to build pressure based on the initial temperature being greater than a first threshold, it further includes: The thermal filter device operates to heat up to a second preset temperature; the second preset temperature is greater than the first threshold.
  • the value range of the first preset temperature is 80°C to 150°C.
  • the first threshold is the freezing point temperature of the urea solution
  • the value range of the first threshold is -6°C to -8°C.
  • the injection demand is proportional to the first time period.
  • a control system of a urea pump which is used to realize the control method described in the technical solution of the second aspect, and the control system of the urea pump includes:
  • the first acquisition unit is used to acquire the initial temperature of the urea pump; the second acquisition unit is used to acquire the injection request and the injection demand; the control unit is used to control the pressure building pump based on the initial temperature being greater than the first threshold To build up the pressure, the control unit is further used to control the instant heating filter device to operate for a first period of time and heat up to a first preset temperature according to the injection request and the injection demand.
  • the control unit controls the pressure build-up pump to build pressure based on the initial temperature being greater than the first threshold, so as to avoid the urea pump being blocked by freezing when the urea solution flows into the urea pump, and the control unit also according to The injection request and the injection demand control the instant heating filter device to operate for a first period of time and heated to a first preset temperature, so that the urea solution is sprayed from the nozzle at the first preset temperature, so that the urea solution It is sprayed from the nozzle at a higher temperature to improve the atomization effect of the urea solution and reduce the probability of crystallization of the urea solution.
  • control unit is further configured to control the instant heating filter device to run and heat to a second preset temperature based on the initial temperature being less than or equal to the first threshold; The second preset temperature is greater than the first threshold.
  • Fig. 1 schematically shows a schematic structural view of a urea pump according to an embodiment of the present application
  • Fig. 2 schematically shows a schematic structural view of an instant filter device according to an embodiment of the present application
  • FIG. 3 schematically shows a schematic flow chart of a method for controlling a urea pump according to an embodiment of the present application
  • Fig. 4 schematically shows a schematic diagram of a control system of a urea pump according to an embodiment of the present application.
  • Liquid inlet pipeline 11 Pressure building pump, 20 Liquid return pipeline, 21 Main pipeline, 22 First branch, 221 Overflow valve, 23 Second branch, 231 Back pump, 30 Liquid outlet pipeline, 31 Pressure sensor, 40 instant filter device, 41 housing, 42 filter element, 43 electric heating element, 44 cavity, 45 inlet, 46 first outlet, 47 second outlet, 100 control unit, 101 first acquisition unit, 102 second acquisition unit, 200 nozzle, 300 urea tank.
  • first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be referred to as These terms are limited. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
  • spatial relative terms may be used herein to describe the relationship of one element or feature as shown in the figures with respect to another element or feature, such as “inner”, “outer”, “inner”. “, “Outside”, “Below”, “Below”, “Above”, “Above”, etc.
  • Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” or “beneath” the other elements or features. feature above”. Thus, the example term “below” can encompass both an orientation of above and below.
  • the device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
  • a urea pump As shown in Figures 1 and 2, according to the embodiment of the present application, a urea pump is proposed.
  • the urea pump includes: a liquid inlet pipeline 10, a liquid return pipeline 20, an outlet pipeline 30, a pressure building pump 11 and
  • a liquid inlet pipeline 10 communicates with the urea tank 300
  • the other end of the liquid inlet pipeline 10 communicates with the inlet 45 of the instant filter device 40
  • One end of the liquid return pipeline 20 communicates with the urea tank 300
  • the other end of the liquid return pipeline 20 communicates with the second outlet 47 of the instant filter device 40 .
  • One end of the liquid outlet pipeline 30 communicates with the first outlet 46 of the instant filter device 40 , and the other end of the liquid outlet pipeline 30 is provided with a nozzle 200 .
  • the pressure building pump 11 is arranged on the liquid inlet pipeline 10, and the pressure building pump 11 is used to drive the urea solution in the urea tank 300 to flow into the urea pump through the liquid inlet pipeline 10, and make the urea solution flow through the instant heat pump at a certain pressure. After the filter device 40, it is sprayed out through the nozzle 200 on the liquid outlet pipeline 30.
  • the return line 20 is used to return the urea solution in the urea pump to the urea tank 300 through the return line 20 after the engine is shut down, so as to prevent the urea solution from remaining in the urea pump, causing the urea pump to be blocked due to crystallization, or In the low temperature state, the urea solution freezes and causes the urea pump to be blocked.
  • the instant filter device 40 is used to filter the urea solution flowing through it and heat it to a first preset temperature, so that the urea solution is sprayed through the nozzle 200 at the first preset temperature, so that the urea solution It is sprayed from the nozzle 200 at a higher temperature, which improves the atomization effect of the urea solution and reduces the probability of crystallization of the urea solution.
  • the urea solution is sprayed out from the nozzle 200 immediately after being heated by the instant filter device 40, and the urea solution at a higher temperature remains in the urea pump for a short time, which reduces the degree of deterioration of the urea solution and reduces the generation of unnecessary
  • the chemical composition ensures that the urea solution has a higher conversion rate after being sprayed from the nozzle 200.
  • the first preset temperature can be set according to actual needs, for example, in an exemplary embodiment, the range of the first preset temperature is set to be 80°C to 150°C. Compared with the urea solution at normal temperature, the urea solution sprayed from the nozzle 200 at a temperature of 80° C. to 150° C.
  • the urea pump proposed by this application does not need to change the overall design structure of the urea pump injection system, and the urea pump in the urea pump injection system of the existing vehicle can be replaced, so that the urea pump proposed by this application has a wider range. scope of application.
  • the instant filter device 40 includes: a housing 41, a filter element 42 and an electric heating element 43, the inside of the housing 41 is hollow to form a cavity 44, the liquid inlet pipeline 10, the liquid return pipeline 20 and the liquid outlet pipeline
  • the pipelines 30 are all in communication with the cavity 44 .
  • the urea solution in the urea tank 300 flows into the cavity 44 through the liquid inlet pipeline 10 and is sprayed out through the liquid outlet pipeline 30 .
  • the liquid return line 20 is used to draw the urea solution in the cavity 44 , the liquid inlet line 10 and the liquid output line 30 back to the urea tank 300 after the engine stops running.
  • the electric heating element 43 is arranged in the cavity 44, and the filter element 42 fills the remaining space of the cavity 44 except the electric heating element 43.
  • the filter element 42 can filter the impurities in the urea solution flowing through the cavity 44 to prevent the urea solution from Contains impurities, resulting in crystallization, resulting in clogging of the nozzle 200.
  • the filter element 42 can be made of industrial filter paper material for filtering the urea solution.
  • the electric heating element 43 is used for heating the urea solution flowing into the cavity 44 , so that the urea solution is sprayed out from the liquid outlet pipeline 30 after being heated.
  • the electric heating element 43 includes an instant electric heater, so as to rapidly heat the urea solution flowing through the cavity 44 .
  • the electric heating element 43 is arranged in the middle of the cavity 44, and the filter element 42 is filled in the cavity 44 on both sides of the electric heating element 43, so that the air flowing through the The urea solution in the cavity 44 is more fully in contact with the electric heating element 43 , improving the heat exchange efficiency between the urea solution and the electric heating element 43 .
  • the urea pump further includes: an overflow valve 221, a back pump 231, a pressure sensor 31, a stop valve and a one-way valve.
  • the overflow valve 221 is arranged on the first branch 22
  • the back pump 231 is arranged on the second branch 23
  • the pressure sensor 31 is arranged on the liquid outlet pipeline 30 .
  • the pressure sensor 31 is used to detect the liquid pressure of the liquid pipeline 30 .
  • the back suction pump 231 is used to empty the urea solution in the pipeline through the back suction pump 231 after the engine stops running, and the urea solution in the pipeline is sucked back into the urea tank 300 .
  • the overflow valve 221 is used to control the pressure in the outlet pipeline 30.
  • the urea solution in the pipeline can overflow through the overflow valve 221 and flow back to the urea pump to reduce the pressure of the inlet pipeline. 10.
  • the pressure in the liquid outlet pipeline 30 and the cavity 44 is kept within a reasonable range.
  • the shut-off valve and the one-way valve are used to prevent the reverse flow of the urea solution from causing the pressure imbalance of the urea solution in the outlet pipeline 30 , so that the pressure building pump 11 can build up the pressure normally.
  • the technical solution of the second aspect of the present application proposes a method for controlling the urea pump, which is used to control the operation of the urea pump in the technical solution of the first aspect.
  • the control method includes the following steps:
  • Step S101 Obtain the initial temperature of the urea pump
  • Step S102 Determine whether the initial temperature is greater than the first threshold, if so, execute step S104, otherwise execute step S103:
  • Step S103 Control the instant heating filter device to run and heat to the second preset temperature
  • Step S104 Control the pressure building pump to build pressure
  • Step S105 Judging whether to obtain the injection quantity request and the injection demand quantity, if so, execute step S106, otherwise end;
  • Step S106 Control the instant filter device to run for a first period of time and heat up to a first preset temperature according to the injection request and the injection demand.
  • the initial temperature of the urea pump is the temperature before the urea pump is turned on
  • the first threshold is the freezing point temperature of the urea solution.
  • the urea solution may freeze when flowing into the urea pump. risks of.
  • the freezing point of the current vehicle urea solution is -11°C.
  • the first threshold in this application is obtained from -6°C to -8°C.
  • step S102 if the initial temperature is greater than the first threshold, it means that the urea solution will not freeze in the urea pump, and if the initial temperature is less than or equal to the first threshold, it means that the urea solution may freeze in the urea pump.
  • step S103 when the initial temperature is less than or equal to the first threshold value, it means that there is a risk of freezing when the urea solution flows into the urea pump. Therefore, the instant heating filter device is controlled to run and heat to the second preset temperature to increase the temperature of the urea pump. High, wherein the second preset temperature is higher than the first threshold, so as to prevent the urea solution from freezing when flowing into the urea pump, causing the urea pump to be blocked.
  • step 104 when it is determined that the temperature of the urea pump is higher than the first threshold, the pressure build-up pump is controlled to build up pressure so that the urea solution in the urea tank flows into the liquid inlet pipeline, the instant filter device and the liquid outlet pipeline It has an appropriate pressure to ensure that when the nozzle is opened, the urea solution can be sprayed at an appropriate pressure to ensure a good atomization effect.
  • steps S105 and S106 by obtaining the injection request and the injection demand, the running time of the instant filter device is determined according to the injection demand, so as to ensure that the instant filter device can heat the urea solution flowing through it to the first A preset temperature, the range of the first preset temperature is set to be 80°C to 150°C.
  • the urea solution is sprayed from the nozzle at a temperature of 80°C to 150°C, which improves the atomization effect of the urea solution and reduces the probability of crystallization of the urea solution, and has a higher conversion rate.
  • the injection demand is proportional to the first time period.
  • the greater the injection demand the longer the time for the urea pump to inject the urea solution. Therefore, according to the injection time of the urea solution, determine the duration of the first period of heating of the instant filter device to ensure that all The urea solution can be heated to a first preset temperature by the instant filter device.
  • the electric heating element in the instant filter device is used to heat the urea solution flowing through the interior of the instant filter device.
  • the technical solution of the third aspect of the present application proposes a urea pump control system for implementing the control method in the technical solution of the second aspect.
  • the urea pump control system includes: a first acquisition unit 101, The second acquisition unit 102 and the control unit 100, the first acquisition unit 101 is used to acquire the initial temperature of the urea pump, the second acquisition unit 102 is used to acquire the injection request and the injection demand, and the control unit 100 is used to obtain the initial temperature based on the initial temperature being greater than the first
  • the threshold is used to control the build-up pressure of the pressure build-up pump.
  • the control unit 100 is also used to control the instant heating filter device to run for a first period of time and heat up to a first preset temperature according to the injection demand.
  • the first control unit 100 is a temperature sensor, and the temperature sensor is arranged inside the urea pump to measure the initial temperature of the urea pump.
  • the second acquisition unit 102 obtains the original displacement of the engine, calculates the NOx value according to the original displacement, and then converts the NOx value into the injection demand of the urea solution.
  • the control unit 100 is specifically an ECU (Electronic Control Unit) electronic control unit 100.
  • control unit 100 is further configured to control the instant heating filter device to operate and heat to a second preset temperature based on the initial temperature being less than or equal to the first threshold, and the second preset temperature is greater than the first threshold, To prevent the urea solution from freezing when flowing into the urea pump, causing the urea pump to be blocked.
  • This application also proposes a vehicle with a urea pump and a urea pump control system, the control method of the vehicle is as follows:
  • the ECU After the vehicle is powered on, the ECU will read the temperature of the urea pump to obtain the initial temperature, and compare the relationship between the initial temperature and the first threshold (thaw threshold) to determine whether the urea pump is in a low-temperature freezing state. If the temperature of the urea pump is not When the first threshold is reached, the urea pump will turn on the instant filter device and rapidly increase to the set second preset temperature, wherein the second preset temperature is higher than the first threshold, and then the urea pump starts to build up pressure.
  • first threshold thaw threshold
  • the ECU sends a pressure building command to the urea pump, requesting the urea pump to build up pressure; when the urea pump receives the requested injection amount sent by the ECU, the urea pump turns on the instant heat type according to the value of the required injection amount.
  • the filtering device sets the rapid heating time (namely the first time period) and the first preset temperature according to the injection volume, and meanwhile the urea pump normally executes the injection request.

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Abstract

一种尿素泵、尿素泵的控制方法及控制系统，其中，尿素泵包括：进液管路(10)；即热式过滤装置(40)，即热式过滤装置(40)的入口(45)经进液管路(10)与尿素箱(300)连通，且设置为过滤并加热经进液管路(10)流入的尿素溶液；建压泵(11)，设于进液管路(10)，且设置为驱动经进液管路(10)流向即热式过滤装置(40)的尿素溶液；出液管路(30)，与即热式过滤装置(40)的第一出口(46)连通，设置为将经过滤并加热的尿素溶液输送至喷嘴(200)；回液管路(20)，与即热式过滤装置(40)的第二出口(47)连通，设置为在停机后将尿素泵内的尿素溶液流回至尿素箱(300)。

Description

尿素泵、尿素泵的控制方法及控制系统
本申请要求于2021年12月29日提交中国专利局、申请号为202111643374.1、发明名称为“尿素泵、尿素泵的控制方法及控制系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及车辆尾气处理技术领域，例如涉及一种尿素泵、尿素泵的控制方法及控制系统。
背景技术
尿素泵是SCR(Selective Catalytic Reduction，催化还原技术)尿素喷射系统的核心部件，通过尿素泵可以使得尿素在一定压力下输送到尿素喷嘴，准确的执行需求的喷射量，保证排放满足法规要求。
目前的尿素泵主要功能是提供一定压力的尿素给尿素喷嘴，低温下能把尿素解冻成功，不能提供温度较高的尿素，常温尿素到达喷嘴喷射到总成后，雾化不好，容易导致结晶问题。若尿素在进入尿素泵之前加热，尿素又易变质，导致转化效率低，且生成不需要的化学成分。
发明内容
本申请提供一种尿素泵、尿素泵的控制方法及控制系统，能够处理常温尿素由喷嘴喷射到总成后的雾化不好，容易导致结晶的问题。
本申请的第一方面，提出了一种尿素泵，所述尿素泵包括：进液管路；即热式过滤装置，所述即热式过滤装置的入口经所述进液管路与尿素箱连通，用于过滤并加热经所述进液管路流入的尿素溶液；建压泵，所述建压泵设于所述进液管路，用于驱动经所述进液管路流向所述即热式过滤装置的尿素溶液；出液管路，所述出液管路与所述即热式过滤装置的第一出口连通，用于将经过滤并加热的尿素溶液输送至喷嘴；回液管路，所述回液管路与所述即热式过滤装置的第二出口连通，用于在停机后将所述尿素泵 内的尿素溶液流回至所述尿素箱。
根据本申请提出的尿素泵，外部尿素溶液流入尿素泵后，可以通过即热式过滤装置对尿素溶液进行过滤，并将尿素溶液加热至第一预设温度，使尿素溶液具有较高的温度，并立即通过出液管路和喷嘴喷出，从而使尿素溶液以较高温度的状态从喷嘴喷出，提高尿素溶液的雾化效果并降低尿素溶液出现结晶的概率。还需说明的是，尿素溶液经过即热式过滤装置加热后立即由喷嘴喷出，较高温度的尿素溶液在尿素泵内存留时间很短，降低尿素溶液变质的程度以及减少生成不需要的化学成分，确保尿素溶液由喷嘴喷出后具有较高的转化率。
另外，根据本申请的尿素泵，还可具有如下附加的技术特征：
在本申请的一些实施方式中，所述即热式过滤装置包括：壳体，所述壳体内设置有空腔；过滤件，填充所述空腔，用于过滤流经所述空腔的尿素溶液；电加热件，设于所述空腔内，用于加热流入所述空腔的尿素溶液；所述进液管路、所述回液管路和所述出液管路均与所述空腔连通。
在本申请的一些实施方式中，所述回液管路包括主管路以及并联在主管路上的第一支路和第二支路；所述尿素泵还包括：溢流阀，设于所述第一支路上；回抽泵，设于所述第二支路上；压力传感器，设于所述出液管路。
本申请的第二方面，提出了一种尿素泵的控制方法，用于控制第一方面技术方案中所述的尿素泵的运行，所述控制方法包括：
获取所述尿素泵的初始温度；基于所述初始温度大于第一阈值，控制建压泵建压；获取喷射请求和喷射需求量；根据所述喷射请求和所述喷射需求量控制即热式过滤装置运行第一时间段并加热至第一预设温度。
根据跟申请提出的尿素泵的控制方法，通过根据所述喷射需求量控制即热式过滤装置运行第一时间段并加热至第一预设温度，以确保即热式过滤装置能够将流经其内部的尿素溶液加热至第一预设温度，使尿素溶液以第一预设温度的状态从喷嘴喷出，从而使尿素溶液以较高温度的状态从喷嘴喷出，提高尿素溶液的雾化效果并降低尿素溶液出现结晶的概率。
在本申请的一些实施方式中，在基于所述初始温度大于第一阈值，控 制所述建压泵建压之前还包括：基于所述初始温度小于或等于所述第一阈值，控制所述即热式过滤装置运行加热至第二预设温度；所述第二预设温度大于所述第一阈值。
在本申请的一些实施方式中，所述第一预设温度的取值范围为80℃至150℃。
在本申请的一些实施方式中，所述第一阈值为尿素溶液的冰点温度，所述第一阈值的取值范围为-6℃至-8℃。
在本申请的一些实施方式中，所述喷射需求量与所述第一时间段成正比。
本申请的第三方面，提出了一种尿素泵的控制系统，用于实现第二方面技术方案中所述的控制方法，所述尿素泵的控制系统包括：
第一获取单元，用于获取所述尿素泵的初始温度；第二获取单元，用于获取喷射请求和喷射需求量；控制单元，用于基于所述初始温度大于第一阈值，控制建压泵建压，所述控制单元还用于根据所述喷射请求和所述喷射需求量控制即热式过滤装置运行第一时间段并加热至第一预设温度。
根据本申请提出的尿素泵的控制系统，通过控制单元基于初始温度大于第一阈值时控制建压泵建压，以避免尿素溶液流入尿素泵内部时结冰造成尿素泵阻塞，并且控制单元还根据所述喷射请求和所述喷射需求量控制即热式过滤装置运行第一时间段并加热至第一预设温度，使尿素溶液以第一预设温度的状态从喷嘴喷出，从而使尿素溶液以较高温度的状态从喷嘴喷出，提高尿素溶液的雾化效果并降低尿素溶液出现结晶的概率。
在本申请的一些实施方式中，所述控制单元还用于基于所述初始温度小于或等于所述第一阈值，控制所述即热式过滤装置运行加热至第二预设温度；所述第二预设温度大于所述第一阈值。
附图说明
在整个附图中，用相同的附图标记表示相同的部件。在附图中：
图1示意性地示出了根据本申请实施方式的尿素泵的结构示意图；
图2示意性地示出了根据本申请实施方式的即热式过滤装置的结构示意图；
图3示意性地示出了根据本申请实施方式的尿素泵的控制方法的流程示意图；
图4示意性地示出了根据本申请实施方式的尿素泵的控制系统的示意图。
附图标记如下：
10进液管路、11建压泵、20回液管路、21主管路、22第一支路、221溢流阀、23第二支路、231回抽泵、30出液管路、31压力传感器、40即热式过滤装置、41壳体、42过滤件、43电加热件、44空腔、45入口、46第一出口、47第二出口、100控制单元、101第一获取单元、102第二获取单元、200喷嘴、300尿素箱。
具体实施方式
应理解的是，文中使用的术语仅出于描述特定示例实施方式的目的，而无意于进行限制。除非上下文另外明确地指出，否则如文中使用的单数形式“一”、“一个”以及“所述”也可以表示包括复数形式。术语“包括”、“包含”、“含有”以及“具有”是包含性的，并且因此指明所陈述的特征、步骤、操作、元件和/或部件的存在，但并不排除存在或者添加一个或多个其它特征、步骤、操作、元件、部件、和/或它们的组合。文中描述的方法步骤、过程、以及操作不解释为必须要求它们以所描述或说明的特定顺序执行，除非明确指出执行顺序。还应当理解，可以使用另外或者替代的步骤。
尽管可以在文中使用术语第一、第二、第三等来描述多个元件、部件、区域、层和/或部段，但是，这些元件、部件、区域、层和/或部段不应被这些术语所限制。这些术语可以仅用来将一个元件、部件、区域、层或部段与另一区域、层或部段区分开。除非上下文明确地指出，否则诸如“第一”、“第二”之类的术语以及其它数字术语在文中使用时并不暗示顺序或者次序。因此，以下讨论的第一元件、部件、区域、层或部段在不脱离示例实 施方式的教导的情况下可以被称作第二元件、部件、区域、层或部段。
为了便于描述，可以在文中使用空间相对关系术语来描述如图中示出的一个元件或者特征相对于另一元件或者特征的关系，这些相对关系术语例如为“内部”、“外部”、“内侧”、“外侧”、“下面”、“下方”、“上面”、“上方”等。这种空间相对关系术语意于包括除图中描绘的方位之外的在使用或者操作中装置的不同方位。例如，如果在图中的装置翻转，那么描述为“在其它元件或者特征下面”或者“在其它元件或者特征下方”的元件将随后定向为“在其它元件或者特征上面”或者“在其它元件或者特征上方”。因此，示例术语“在……下方”可以包括在上和在下的方位。装置可以另外定向(旋转90度或者在其它方向)并且文中使用的空间相对关系描述符相应地进行解释。
如图1和图2所示，根据本申请的实施方式，提出了一种尿素泵，尿素泵包括：进液管路10、回液管路20、出液管路30、建压泵11和即热式过滤装置40，进液管路10的一端与尿素箱300连通，进液管路10的另一端与即热式过滤装置40的入口45连通。回液管路20的一端与尿素箱300连通，回液管路20的另一端与即热式过滤装置40的第二出口47连通。出液管路30的一端与即热式过滤装置40第一出口46连通，出液管路30的另一端设置喷嘴200。建压泵11设置在进液管路10上，建压泵11用于驱动尿素箱300内的尿素溶液通过进液管路10流入尿素泵，并使尿素溶液以一定的压力流经即热式过滤装置40后，经出液管路30上的喷嘴200喷出。回液管路20用于当发动机停机后，尿素泵内的尿素溶液经回液管路20重新流回尿素箱300，避免尿素溶液在尿素泵内部存留，造成尿素泵内部由于出现结晶阻塞，或在低温状态下尿素溶液结冰造成尿素泵阻塞。具体地，即热式过滤装置40用于对流经其内部的尿素溶液进行过滤并加热至第一预设温度，使尿素溶液以第一预设温度的状态经喷嘴200喷出，从而使尿素溶液以较高温度的状态从喷嘴200喷出，提高尿素溶液的雾化效果并降低尿素溶液出现结晶的概率。
还需说明的是，尿素溶液经过即热式过滤装置40加热后立即由喷嘴200喷出，较高温度的尿素溶液在尿素泵内存留时间很短，降低尿素溶液变质的程度，减少生成不需要的化学成分，确保尿素溶液由喷嘴200喷出 后具有较高的转化率。其中，第一预设温度可以根据实际需求设定，例如在一个示例性的实施例中，第一预设温度的范围设定为80℃至150℃。相对于常温状态的尿素溶液，以80℃至150℃的温度由喷嘴200喷出的尿素溶液的雾化效果更好，不易在喷嘴200上结晶，并且具有较高的转化率。需要强调的是，本申请提出的尿素泵不需要更改尿素泵喷射系统的整体设计结构，能够对现有车辆的尿素泵喷射系统中的尿素泵进行更换，使本申请提出的尿素泵具有更广的适用范围。
本实施例中，即热式过滤装置40包括：壳体41、过滤件42和电加热件43，壳体41内部中空形成空腔44，进液管路10、回液管路20和出液管路30均与空腔44连通。尿素箱300中的尿素溶液经进液管路10流入空腔44内，并通过出液管路30喷出。回液管路20用于发动机停止运行后，将空腔44以及进液管路10和出液管路30中的尿素溶液抽离流回尿素箱300。电加热件43设于空腔44内，过滤件42填充空腔44除电加热件43外的其余空间，过滤件42能够将流经空腔44的尿素溶液中的杂质过滤，以防止尿素溶液中含有杂质，致使结晶，导致喷嘴200堵塞。过滤件42具体可采用工业滤纸材料用于过滤尿素溶液。电加热件43用于对流入空腔44内的尿素溶液加热，使尿素溶液经加热后从出液管路30喷出。本实施例中，电加热件43包括即热式电加热器，以便于对流经空腔44的尿素溶液进行快速加热。
在一个示例性实施例中，如图2所示，电加热件43设置在空腔44的中间位置，在电加热件43的两侧的空腔44内填充过滤件42，以使流经空腔44内的尿素溶液更充分的与电加热件43接触，提高尿素溶液与电加热件43的换热效率。
在本申请的一些实施方式中，尿素泵还包括：溢流阀221、回抽泵231、压力传感器31、截止阀和单向阀，回液管路20包括主管路21以及并联在主管路21上的第一支路22和第二支路23。溢流阀221设于第一支路22上，回抽泵231设于第二支路23上，压力传感器31设于出液管路30。压力传感器31用于检测出液管路30的液体压力。回抽泵231用于发动机停止运行后，通过回抽泵231将管路中的尿素溶液排空，管路中的尿素溶液回吸到尿素箱300。溢流阀221用于控制出液管路30中的压力，当建压泵 11建压过大时，管路中的尿素溶液可以通过溢流阀221溢出流回尿素泵从而降低进液管路10、出液管路30以及空腔44内的压力，使压力保持在合理的范围内。截止阀和单向阀用于避免尿素溶液反向流动从而导致出液管路30中的尿素溶液压力失衡，以便于建压泵11能够正常建压。
本申请的第二方面技术方案，提出了一种尿素泵的控制方法，用于控制第一方面技术方案中的尿素泵的运行，如图3所示，控制方法包括如下步骤：
步骤S101：获取尿素泵的初始温度；
步骤S102：判断初始温度是否大于第一阈值，若是则执步骤S104，若否则执行步骤S103：
步骤S103：控制即热式过滤装置运行加热至第二预设温度；
步骤S104：控制建压泵建压；
步骤S105：判断是否获取喷射量请求和喷射需求量，若是则执行步骤S106，若否则结束；
步骤S106：根据所述喷射请求和所述喷射需求量控制即热式过滤装置运行第一时间段并加热至第一预设温度。
在本实施例中，尿素泵的初始温度即为尿素泵开启前的温度，第一阈值为尿素溶液的冰点温度，当尿素泵的温度处于第一阈值时，尿素溶液流入尿素泵可能存在结冰的风险。当前车用尿素溶液的冰点为-11℃，为确保尿素泵不会由于尿素溶液结冰造成阻塞，本申请中的第一阈值取得取值范围为-6℃至-8℃。因此，在步骤S102中，若初始温度大于第一阈值则说明尿素溶液在尿素泵内不会结冰，若初始温度小于或等于第一阈值则说明尿素溶液在尿素泵内存在结冰的风险。在步骤S103中，当初始温度小于或等于第一阈值时，说明尿素溶液流入尿素泵时存在结冰风险，因此控制即热式过滤装置运行加热至第二预设温度，使尿素泵的温度升高，其中，第二预设温度高于第一阈值，以避免尿素溶液流入尿素泵时结冰，造成尿素泵阻塞。在步骤104中，当确定尿素泵的温度高于第一阈值后，控制建压泵建压，以使尿素箱内的尿素溶液流入进液管路、即热式过滤装置以及出液管路时具有适当的压力，从而保证当喷嘴开启时，尿素溶液能够以适当的压力喷射，以保证良好的雾化效果。在步骤S105和步骤S106中，通过获 取喷射请求和喷射需求量，根据喷射需求量确定即热式过滤装置的运行时间，以确保即热式过滤装置能够将流经其内部的尿素溶液加热至第一预设温度，第一预设温度的范围设定为80℃至150℃。相对于常温状态的尿素溶液，尿素溶液以80℃至150℃的温度由喷嘴喷出，提高尿素溶液的雾化效果并降低尿素溶液出现结晶的概率，并且具有较高的转化率。
在一个示例性的实施例中，喷射需求量与第一时间段成正比。喷射需求量越大，则尿素泵喷射尿素溶液的时间越长，因此根据尿素溶液的喷射时间确定即热式过滤装置加热的第一时间段的时长，以确保在尿素溶液的喷射过程中全部的尿素溶液够能够被即热式过滤装置加热至第一预设温度。其中，即热式过滤装置中的电加热件用于加热流经即热式过滤装置内部尿素溶液。
本申请的第三方面技术方案，提出了一种尿素泵的控制系统，用于实现第二方面技术方案中的控制方法，如图4所示，尿素泵控制系统包括：第一获取单元101、第二获取单元102和控制单元100，第一获取单元101用于获取尿素泵的初始温度，第二获取单元102用于获取喷射请求和喷射需求量，控制单元100用于基于初始温度大于第一阈值，控制建压泵建压，控制单元100还用于根据喷射需求量控制即热式过滤装置运行第一时间段并加热至第一预设温度。其中，第一控制单元100为温度传感器，将温度传感器设置在尿素泵内部从而测得尿素泵的初始温度。第二获取单元102通过获取发动机的原排量，根据原排量计算得到NOx值，再根据NOx值转化成尿素溶液的喷射需求量。控制单元100具体为ECU(Electronic Control Unit)电子控制单元100。
在本申请的一些实施方式中，控制单元100还用于基于初始温度小于或等于第一阈值，控制即热式过滤装置运行加热至第二预设温度，第二预设温度大于第一阈值，以避免尿素溶液流入尿素泵时结冰，造成尿素泵阻塞。
本申请还提出一种具有尿素泵和尿素泵控制系统的车辆，该车辆的控制方式如下：
在整车上电后，ECU会读取尿素泵的温度获取初始温度，比较初始温度与第一阈值(即解冻阈值)的大小关系来判断尿素泵是否处于低温结冰 状态，若尿素泵温度未达到第一阈值，尿素泵即开启即热式过滤装置，快速提升到设定的第二预设温度，其中，第二预设温度高于第一阈值，随后尿素泵开始建压。若温度已达到第一阈值，ECU给尿素泵发送建压指令，要求尿素泵进行建压；尿素泵在收到ECU发送的请求喷射量时，根据需求喷射量的数值，尿素泵开启即热式过滤装置，根据喷射量大小，设定快速加热的时间(即第一时间段)和第一预设温度，同时尿素泵正常执行喷射请求。

Claims (10)

  1. 一种尿素泵，包括：
    进液管路(10)；
    即热式过滤装置(40)，所述即热式过滤装置(40)的入口(45)经所述进液管路(10)与尿素箱(300)连通，所述即热式过滤装置(40)设置为过滤并加热经所述进液管路(10)流入的尿素溶液；
    建压泵(11)，所述建压泵(11)设于所述进液管路(10)，且设置为驱动经所述进液管路(10)流向所述即热式过滤装置(40)的尿素溶液；
    出液管路(30)，所述出液管路(30)与所述即热式过滤装置(40)的第一出口(46)连通，且设置为将经过滤并加热的尿素溶液输送至喷嘴(200)；
    回液管路(20)，所述回液管路(20)与所述即热式过滤装置(40)的第二出口(47)连通，且设置为在停机后将所述尿素泵内的尿素溶液流回至所述尿素箱(300)。
  2. 根据权利要求1所述的尿素泵，其中，所述即热式过滤装置(40)包括：
    壳体(41)，所述壳体(41)内设置有空腔(44)；
    过滤件(42)，填充所述空腔(44)，用于过滤流经所述空腔(44)的尿素溶液；
    电加热件(43)，设于所述空腔(44)内，用于加热流入所述空腔(44)的尿素溶液；
    所述进液管路(10)、所述回液管路(20)和所述出液管路(30)均与所述空腔(44)连通。
  3. 根据权利要求1所述的尿素泵，其中，
    所述回液管路(20)包括主管路(21)以及并联在所述主管路(21)上的第一支路(22)和第二支路(23)；
    所述尿素泵还包括：
    溢流阀(221)，设于所述第一支路(22)上；
    回抽泵(231)，设于所述第二支路(23)上；
    压力传感器(31)，设于所述出液管路(30)。
  4. 一种尿素泵的控制方法，设置为控制如权利要求1至3中任一项所述的尿素泵的运行，所述控制方法包括：
    获取所述尿素泵的初始温度；
    基于所述初始温度大于第一阈值，控制建压泵(11)建压；
    获取喷射请求和喷射需求量；
    根据所述喷射请求和所述喷射需求量控制即热式过滤装置(40)运行第一时间段并加热至第一预设温度。
  5. 根据权利要求4所述的尿素泵的控制方法，其中，在基于所述初始温度大于第一阈值，控制所述建压泵(11)建压之前还包括：
    基于所述初始温度小于或等于所述第一阈值，控制所述即热式过滤装置(40)运行加热至第二预设温度；
    所述第二预设温度大于所述第一阈值。
  6. 根据权利要求4所述的尿素泵的控制方法，其中，
    所述第一预设温度的取值范围为80℃至150℃。
  7. 根据权利要求4所述的尿素泵的控制方法，其中，
    所述第一阈值为尿素溶液的冰点温度，所述第一阈值的取值范围为-6℃至-8℃。
  8. 根据权利要求4所述的尿素泵的控制方法，其中，
    所述喷射需求量与所述第一时间段成正比。
  9. 一种尿素泵的控制系统，设置为实现如权利要求4至8中任一项所述的控制方法，所述尿素泵的控制系统包括：
    第一获取单元(101)，设置为获取所述尿素泵的初始温度；
    第二获取单元(102)，设置为获取喷射请求和喷射需求量；
    控制单元(100)，设置为基于所述初始温度大于第一阈值，控制建压泵(11)建压，所述控制单元(100)还设置为根据所述喷射请求和所述喷射需求量控制即热式过滤装置(40)运行第一时间段并加热至第一预设温度。
  10. 根据权利要求9所述的尿素泵的控制系统，其中，
    所述控制单元(100)还设置为基于所述初始温度小于或等于所述第一 阈值，控制所述即热式过滤装置(40)运行加热至第二预设温度；
    所述第二预设温度大于所述第一阈值。
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