WO2020215303A1 - 后处理***、后处理***的控制方法及车辆 - Google Patents

后处理***、后处理***的控制方法及车辆 Download PDF

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Publication number
WO2020215303A1
WO2020215303A1 PCT/CN2019/084486 CN2019084486W WO2020215303A1 WO 2020215303 A1 WO2020215303 A1 WO 2020215303A1 CN 2019084486 W CN2019084486 W CN 2019084486W WO 2020215303 A1 WO2020215303 A1 WO 2020215303A1
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WIPO (PCT)
Prior art keywords
way valve
post
injection system
pipeline
temperature
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PCT/CN2019/084486
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English (en)
French (fr)
Inventor
张瑜
王晓华
王意宝
姚旺
伏金龙
Original Assignee
潍柴动力股份有限公司
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Publication date
Application filed by 潍柴动力股份有限公司 filed Critical 潍柴动力股份有限公司
Priority to PCT/CN2019/084486 priority Critical patent/WO2020215303A1/zh
Priority to CN201980094219.3A priority patent/CN113924410B/zh
Priority to US17/606,377 priority patent/US11578635B2/en
Priority to EP19926286.6A priority patent/EP3961004B1/en
Publication of WO2020215303A1 publication Critical patent/WO2020215303A1/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]
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0093—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are of the same type
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/087—Other arrangements or adaptations of exhaust conduits having valves upstream of silencing apparatus for by-passing at least part of exhaust directly to atmosphere
    • 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
    • F01N2340/00—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses
    • F01N2340/06—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses characterised by the arrangement of the exhaust apparatus relative to the turbine of a turbocharger
    • 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
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • 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
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • F01N2410/02—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device in case of high temperature, e.g. overheating of catalytic reactor
    • 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
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • F01N2410/10—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device for reducing flow resistance, e.g. to obtain more engine power
    • 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
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • F01N2410/12—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device in case of absorption, adsorption or desorption of exhaust gas constituents
    • 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
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/06—By-pass systems
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • 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
    • F01N2610/12—Adding substances to exhaust gases the substance being in solid form, e.g. pellets or powder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1602—Temperature of exhaust gas apparatus
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F01N3/0878—Bypassing absorbents or adsorbents
    • 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
    • F01N3/103—Oxidation catalysts for HC and CO only
    • 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
    • F01N3/2053—By-passing catalytic reactors, e.g. to prevent overheating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to the field of SCR systems, and more specifically, to a post-processing system, a control method of the post-processing system, and a vehicle.
  • SCR is a process for the treatment of NOx in the exhaust emissions of diesel vehicles, that is, under the action of a catalyst, the reducing agent ammonia or urea is injected to reduce the NOx in the exhaust gas to N2 and H2O, thereby achieving the purpose of energy saving and emission reduction.
  • the existing dual-injection technical solution is based on a series-connected dual SCR system.
  • the two SCR systems are located behind the supercharger.
  • the urea nozzle corresponding to one SCR system is controlled to inject urea first.
  • the control When the temperature at the other SCR system is higher, the control
  • the urea nozzle corresponding to the other SCR system also sprays urea.
  • the two urea nozzles spray urea at the same time.
  • This kind of series dual SCR system causes energy loss when the exhaust gas flows through the supercharger at low temperature, resulting in low NOx conversion efficiency at low temperature; and at high temperature, the post-processor system has large heat capacity and high back pressure, which affects Engine performance.
  • the present invention proposes a post-processing system, a control method of the post-processing system, and a vehicle, and intends to solve the above technical problems.
  • a post-processing system including:
  • a temperature sensor, a three-way valve, a supercharger, a DOC (diesel oxide catalyst), and a first SCR (selectively catalytic reduction) are arranged in the exhaust main line in sequence;
  • a bypass pipeline arranged in parallel with the supercharger, the input port of the bypass pipeline is connected to one outlet of the three-way valve, and the output port of the bypass pipeline is connected to the supercharger and The pipeline between the DOCs;
  • a second SCR provided in the bypass pipeline
  • a first injection system for injecting a reducing agent into the pipeline between the first SCR and the DOC;
  • a controller respectively connected with the temperature sensor, the three-way valve, the first injection system, and the second injection system.
  • the second SCR and the supercharger are connected in parallel, and a three-way valve is installed before the second SCR and the supercharger.
  • a three-way valve is installed before the second SCR and the supercharger.
  • the material of the catalyst carrier of the second SCR is metal.
  • the material of the catalyst is metal, which can raise the temperature quickly and has good low-temperature ignition characteristics.
  • the reducing agent injected by the second injection system is solid ammonia.
  • the second injection system that injects solid ammonia before the second SCR can effectively reduce NOx emissions at low temperatures and avoid urea crystallization.
  • the reducing agent injected by the first injection system is solid ammonia or urea solution.
  • the first SCR is specifically SCRF (SCR on Filter).
  • SCRF SCR on Filter
  • the working principle of SCRF is to coat SCR catalyst, such as copper zeolite Cu/ZSM-5, on the surface of a wall-flow DPF substrate with high porosity.
  • the wall surface of the filter body can not only catalyze the oxidation of the deposited soot, but also It can effectively reduce NOx under the action of reducing agent NH 3 .
  • the miniaturization, weight reduction and cost reduction of the after-treatment device are realized at the same time.
  • a control method of a post-processing system based on any one of the above-mentioned post-processing systems, the control method includes:
  • control the three-way valve to be in the second position control the second injection system to be in the closed state, and the connection between the first SCR and the DOC
  • the first injection system is controlled to be in working state, and when the three-way valve is in the second position, the exhaust gas flows through the existing branch of the supercharger and does not Flow through the bypass branch.
  • the branch of the turbocharger When the exhaust gas temperature is low, the branch of the turbocharger is closed through the three-way valve, and the exhaust gas passes through the bypass pipeline, which reduces the energy loss caused by the exhaust gas passing through the turbocharger and improves the NOx conversion efficiency at low temperatures.
  • the exhaust gas temperature is high, close the bypass pipeline, the exhaust gas flows through the supercharger and the first SCR, and the first SCR is used to reduce NOx emissions in the exhaust gas, reduce the heat capacity and back pressure of the aftertreatment system, and reduce the aftertreatment system Impact on engine performance.
  • a vehicle the aftertreatment system described in any one of the above.
  • the second SCR and the supercharger are connected in parallel, and a three-way valve is arranged before the second SCR and the supercharger.
  • a three-way valve is arranged before the second SCR and the supercharger.
  • FIG. 1 is a schematic structural diagram of a post-processing system provided by an embodiment of the present invention
  • Fig. 2 is a flowchart of a control method of a post-processing system provided by an embodiment of the present invention.
  • the post-processing chest includes:
  • the temperature sensor 11, the three-way valve 12, the supercharger 13, the DOC 14, and the first SCR 15 are sequentially arranged in the main exhaust pipe of the engine.
  • the first SCR 15 is specifically SCRF.
  • a bypass line 16 provided in parallel with the supercharger 13.
  • the input port of the bypass line 16 is connected to an outlet of the three-way valve 12, and the output port of the bypass line 16 is connected to the line between the supercharger 13 and the DOC 14.
  • the three-way valve 12 includes an inlet and two outlets. One outlet is connected to the branch where the supercharger 13 exists, and the other outlet is connected to the bypass line 16.
  • the exhaust gas enters the three-way valve 12 through the inlet, and can be controlled by the three-way valve 12. The exhaust gas is controlled to pass through the supercharger 13 or the bypass line 16.
  • the second SCR 17 provided in the bypass line 16.
  • the material of the catalyst carrier of the second SCR 17 is metal.
  • the first injection system 18 for injecting the reducing agent into the pipeline between the first SCR 15 and the DOC 14.
  • the reducing agent injected by the first injection system is solid ammonia or urea solution.
  • the reducing agent injected by the second injection system is solid ammonia.
  • a controller (not shown) connected to the temperature sensor 11, the three-way valve 12, the first injection system 18, and the second injection system 19, respectively.
  • the controller controls the states of the three-way valve 12, the first injection system 18, and the second injection system 1 according to the data collected by the temperature sensor 11 and the exhaust gas temperature in the pipeline between the first SCR 15 and the DOC 14 respectively.
  • a control method of a post-processing system provided in this embodiment is applied to the controller of the above-mentioned post-processing system, and the control method includes the steps:
  • the first temperature threshold T1 is a calibration value obtained through a bench test. Specifically, the NOx conversion efficiency required by the aftertreatment system is determined according to the original engine emissions and target emissions requirements. According to the NOx emission results during the cold cycle, determine the temperature range that needs to improve the NOx conversion efficiency. For example, if the NOx emission in the interval below t°C needs to be reduced, then T1 is determined as the set value near t, and the range of the temperature threshold T1 is found. Perform T1 calibration, and finally determine the first temperature threshold T1 through NOx emissions.
  • the second temperature threshold T2 and the third temperature threshold T3 are both preset values.
  • the third temperature threshold T3 is set to 150°C, which can be set between the first SCR15 and the DOC14
  • the third temperature threshold T3 is set to 180°C, which can be set between the first SCR15 and DOC14
  • the injection of the urea aqueous solution is started.
  • the second temperature threshold T2 is set to 150°C, and the solid ammonia can be injected when the collection temperature T reaches 150°C.
  • the second temperature threshold T2 is set to 180°C, and the solid ammonia can be injected when the collection temperature T reaches 180°C.
  • This embodiment also provides a vehicle including the above-mentioned post-processing system.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Materials Engineering (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

一种后处理***，后处理***包括两个SCR，第二SCR与增压器采用并联方式，并在第二SCR和增压器之前设置一个三通阀，通过控制三通阀来控制尾气流经第二SCR还是增压器。在低温时，控制三通阀以关闭增压器支路，使得尾气流经串联的第二SCR和第一SCR，降低尾气流经增压器造成的能量损失，提高了低温时NOx的转化效率。在高温时，控制三通阀以关闭旁通管路，尾气流经增压器和第一SCR，降低后处理***的热容和背压，进而降低后处理***对发动机性能的影响。还提供了一种后处理***的控制方法和具有该***的车辆。

Description

后处理***、后处理***的控制方法及车辆 技术领域
本发明涉及SCR***领域，更具体地说，涉及后处理***、后处理***的控制方法及车辆。
背景技术
SCR是针对柴油车尾气排放中NOx的一项处理工艺，即在催化剂的作用下，喷入还原剂氨或尿素，把尾气中的NOx还原成N2和H2O，从而达到节能减排的目的。
现有的双喷射技术方案是基于串联的双SCR***，两套SCR***位于增压器后，控制一个SCR***对应的尿素喷嘴先喷射尿素，当另一个SCR***处的温度较高时，控制另一个SCR***对应的尿素喷嘴也喷射尿素，此时两个尿素喷嘴同时喷射尿素。这种串联的双SCR***，在低温时尾气流经增压器，造成能量损失，导致低温时NOx的转化效率较低；以及在高温时，后处理器***热容大且背压高，影响发动机性能。
发明内容
有鉴于此，本发明提出后处理***、后处理***的控制方法及车辆，欲解决上述技术问题。
为了解决上述技术问题，现提出的方案如下：
一种后处理***，包括：
依次设置在排气主管路中的温度传感器、三通阀、增压器、DOC(diesel oxide catalyst，氧化催化转换器)、第一SCR(selectively catalytic reduction，选择性催化转换装置)；
与所述增压器并联设置的旁通管路，所述旁通管路的输入端口连接所述三通阀的一个出口，所述旁通管路的输出端口连接在所述增压器与所述DOC之间的管路；
设置在所述旁通管路中的第二SCR；
用于将还原剂喷射到所述第一SCR与所述DOC之间的管路的第一喷射***；
用于将还原剂喷射到所述第二SCR与所述三通阀之间的管路的第二喷射***；
以及分别与所述温度传感器、所述三通阀、所述第一喷射***、所述第二喷射***连接的控制器。
第二SCR与增压器采用并联方式，并在第二SCR和增压器之前设置一个三通阀，通过控制三通阀来控制尾气流经第二SCR还是增压器，进而保证低速低负荷时NOx转化效率，提升后处理***的性能。
可选的，所述第二SCR的催化剂载体的材料为金属。催化剂的材料采用金属，能够快速提温，低温起燃特性好。
可选的，所述第二喷射***喷射的还原剂为固态氨。第二SCR前采用喷射固态氨的第二喷射***，能够有效降低低温时NOx排放，同时避免了尿素结晶的发生。
可选的，所述第一喷射***喷射的还原剂为固态氨或尿素溶液。
可选的，所述第一SCR具体为SCRF(SCR on Filter)。SCRF的工作原理是将SCR催化剂，如铜沸石Cu/ZSM-5，涂覆到具有高孔隙率的壁流式DPF基底表面，在过滤体的壁面既能将沉积的碳烟催化氧化，同时又能在还原剂NH 3作用下高效率催化还原NOx。在显著降低柴油机NOx和PM排放的基础上，同时实现了后处理装置的小型化、轻量化和低成本化。
一种后处理***的控制方法，基于上述任意一项所述的后处理***，所述控制方法包括：
获取所述温度传感器的采集温度；
判断所述采集温度是否大于第一温度阈值，若否，则控制所述三通阀处于第一位置，在采集温度大于第二温度阈值时，控制第二喷射***处于工作状态，以及在第一SCR与DOC之间的管路中尾气温度大于第三温度阈值时，控制所述第一喷射***处于工作状态，所述三通阀处于所述第一位置时，尾气流过所述旁通支路且不流过所述增压器存在的支路，若是，则控制所述三通阀处于第 二位置，控制所述第二喷射***处于关闭状态，以及在第一SCR与DOC之间的管路中尾气温度大于第三温度阈值时，控制所述第一喷射***处于工作状态，所述三通阀处于所述第二位置时，尾气流过所述增压器存在的支路且不流过所述旁通支路。
当尾气温度较低时，通过三通阀关闭增压器支路，尾气走旁通管路，降低了尾气流经增压器造成的能量损失，提升了低温时NOx转化效率。尾气温度较高时，关闭旁通管路，尾气流经增压器和第一SCR，利用第一SCR，降低尾气中的NOx排放，降低后处理***的热容和背压，降低后处理***对发动机性能的影响。
一种车辆，上述任意一项所述的后处理***。
与现有技术相比，本发明的技术方案具有以下优点：
上述技术方案提供的后处理***，第二SCR与增压器采用并联方式，并在第二SCR和增压器之前设置一个三通阀，通过控制三通阀来控制尾气流经第二SCR还是增压器。在低温时，控制三通阀以关闭增压器支路，使得尾气流经串联的第二SCR和第一SCR，降低尾气流经增压器造成的能量损失，提高了低温时NOx的转化效率。在高温时，控制三通阀以关闭旁通管路，尾气流经增压器和第一SCR，降低后处理***的热容和背压，进而降低后处理***对发动机性能的影响。
当然，实施本发明的任一产品并不一定需要同时达到以上所述的所有优点。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据提供的附图获得其他的附图。
图1为本发明实施例提供的一种后处理***的结构示意图；
图2为本发明实施例提供的后处理***的控制方法的流程图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
参见图1，为本实施例提供的一种后处理***，该后处理胸包括：
依次设置在发动机的排气主管路中的温度传感器11、三通阀12、增压器13、DOC14、第一SCR15。在一个具体实施例中第一SCR15具体为SCRF。
与增压器13并联设置的旁通管路16。旁通管路16的输入端口连接三通阀12的一个出口，旁通管路16的输出端口连接在增压器13与DOC14之间的管路。三通阀12包括一个入口和两个出口，一个出口连接增压器13存在的支路，另一个出口连接旁通管路16，尾气通过入口进入三通阀12，通过控制三通阀12可以控制尾气流过增压器13或旁通管路16。
设置在旁通管路16中的第二SCR17。在一个具体实施例中第二SCR17的催化剂载体的材料为金属。
用于将还原剂喷射到第一SCR15与DOC14之间的管路的第一喷射***18。在一个具体实施例中第一喷射***喷射的还原剂为固态氨或尿素溶液。
用于将还原剂喷射到第二SCR17与三通阀12之间的管路的第二喷射***19。在一个具体实施例中第二喷射***喷射的还原剂为固态氨。
以及分别与温度传感器11、三通阀12、第一喷射***18、第二喷射***19连接的控制器(未示出)。控制器根据温度传感器11采集的数据,以及第一SCR15与DOC14之间的管路中尾气温度，分别控制三通阀12、第一喷射***18、第二喷射***1的状态。
参见图2，为本实施例提供的一种后处理***的控制方法，应用于上述后处理***的控制器，该控制方法包括步骤：
S11：获取温度传感器11的采集温度T。
S12：判断采集温度T是否大于第一温度阈值T1，若否，则执行步骤S13，若是，则执行步骤S14。
第一温度阈值T1为通过台架试验得到的标定值。具体的，根据发动机原 排和目标排放要求，确定后处理***需求的NOx转化效率。根据冷态循环时NOx的排放结果，确定需要提升NOx转化效率的温度区间，例如需要降低t℃以下区间的NOx排放，则T1确定为t附近的设定值，找出温度阈值T1的范围，进行T1标定，通过NOx排放最终确定第一温度阈值T1。
S13：控制三通阀12处于第一位置，在采集温度T大于第二温度阈值T2时，控制第二喷射***19处于工作状态，以及在第一SCR15与DOC14之间的管路中尾气温度大于第三温度阈值T3时，控制第一喷射***18处于工作状态。
三通阀12处于第一位置时，尾气流过旁通支路16且不流过增压器13存在的支路。第二温度阈值T2和第三温度阈值T3均为预先设定的值，当第一喷射***18喷射的是固态氨时，第三温度阈值T3设定为150℃，可以在第一SCR15与DOC14之间的管路中尾气温度达到150℃时，开始喷射固态氨；当第一喷射***18喷射的是尿素水溶液时，第三温度阈值T3设定为180℃，可以在第一SCR15与DOC14之间的管路中尾气温度达到180℃时，开始喷射尿素水溶液的喷射。当第二喷射***19喷射的是固态氨时，设定第二温度阈值T2为150℃，可以在采集温度T达到150℃时，开始喷射固态氨。当第二喷射***19喷射的是尿素水溶液时，设定第二温度阈值T2为180℃，可以在采集温度T达到180℃时，开始喷射固态氨。
S14：控制三通阀12处于第二位置，控制第二喷射***19处于关闭状态，以及在第一SCR15与DOC14之间的管路中尾气温度大于第三温度阈值T3时，控制第一喷射***18处于工作状态。
三通阀12处于第一位置时，尾气流过增压器13存在的支路且不流过旁通支路16。
本实施例还提供一种车辆，包括上述的后处理***。
在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者 是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。
对本发明所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。

Claims (7)

  1. 一种后处理***，其特征在于，包括：
    依次设置在排气主管路中的温度传感器、三通阀、增压器、氧化催化转换器、第一选择性催化转换装置；
    与所述增压器并联设置的旁通管路，所述旁通管路的输入端口连接所述三通阀的一个出口，所述旁通管路的输出端口连接在所述增压器与所述氧化催化转换器之间的管路；
    设置在所述旁通管路中的第二选择性催化转化装置；
    用于将还原剂喷射到所述第一选择性催化转化装置与所述氧化催化转化器之间的管路的第一喷射***；
    用于将还原剂喷射到所述第二选择性催化转化装置与所述三通阀之间的管路的第二喷射***；
    以及分别与所述温度传感器、所述三通阀、所述第一喷射***、所述第二喷射***连接的控制器。
  2. 根据权利要求1所述的后处理***，其特征在于，所述第二选择性催化转化装置的催化剂载体的材料为金属。
  3. 根据权利要求1所述的后处理***，其特征在于，所述第二喷射***喷射的还原剂为固态氨。
  4. 根据权利要求1所述的后处理***，其特征在于，所述第一喷射***喷射的还原剂为固态氨或尿素溶液。
  5. 根据权利要求1所述的后处理***，其特征在于，所述第一选择性催化转化装置具体为SCRF。
  6. 一种后处理***的控制方法，其特征在于，基于如权利要求1～5任意一项所述的后处理***，所述控制方法包括：
    获取所述温度传感器的采集温度；
    判断所述采集温度是否大于第一温度阈值，若否，则控制所述三通阀处于第一位置，在所述采集温度大于第二温度阈值时，控制第二喷射***处于工作状态，以及在第一选择性催化转化装置与氧化催化转换器之间管路中的尾气温 度大于第三温度阈值时，控制所述第一喷射***处于工作状态，所述三通阀处于所述第一位置时，尾气流过所述旁通支路且不流过所述增压器存在的支路，若是，则控制所述三通阀处于第二位置，控制所述第二喷射***处于关闭状态，以及在第一选择性催化转化装置与氧化催化转换器之间管路中的尾气温度大于第三温度阈值时，控制所述第一喷射***处于工作状态，所述三通阀处于所述第二位置时，尾气流过所述增压器存在的支路且不流过所述旁通支路。
  7. 一种车辆，其特征在于，包括如权利要求1～5任意一项所述的后处理***。
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