WO2023131348A1 - 双dpf移除的监控方法、装置和发动机 - Google Patents

双dpf移除的监控方法、装置和发动机 Download PDF

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WO2023131348A1
WO2023131348A1 PCT/CN2023/071692 CN2023071692W WO2023131348A1 WO 2023131348 A1 WO2023131348 A1 WO 2023131348A1 CN 2023071692 W CN2023071692 W CN 2023071692W WO 2023131348 A1 WO2023131348 A1 WO 2023131348A1
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dpf
preset
differential pressure
pressure
downstream
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PCT/CN2023/071692
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English (en)
French (fr)
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王德成
王国栋
安宁
吕志华
褚国良
杨新达
李钊
王云
张忠祥
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潍柴动力股份有限公司
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Publication of WO2023131348A1 publication Critical patent/WO2023131348A1/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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • 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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas 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
    • 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
    • F01N2900/08—Parameters used for exhaust control or diagnosing said parameters being related to the engine
    • 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
    • F01N2900/12—Parameters used for exhaust control or diagnosing said parameters being related to the vehicle exterior
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • 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
    • F01N2900/1606—Particle filter loading or soot amount
    • 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 automobile control, for example, to a monitoring method, device and engine for double DPF removal.
  • DPF diesel particulate filter, diesel particulate filter
  • the present application provides a monitoring method for double DPF removal, which can deal with the situation that the accuracy of dual DPF removal monitoring is low.
  • the method is applied to an engine aftertreatment system including double DPFs, and the two DPFs are respectively provided with differential pressure sensors for detecting the pressure difference of the DPF and the downstream pressure, and the method includes:
  • the differential pressure of the two DPFs is obtained based on each differential pressure sensor
  • the downstream pressures of the two DPFs are respectively obtained based on the pressure difference sensors;
  • the first preset pressure difference limit is not greater than the second preset pressure difference limit.
  • the method further includes:
  • the method also includes:
  • the monitoring time is not greater than the preset duration, determine whether the preset monitoring release condition is satisfied, and obtain the new pressure difference of the two DPFs based on each differential pressure sensor when the preset monitoring release condition is met .
  • the differential pressure sensor includes a DPF upstream air intake pipe and a DPF downstream air intake pipe, and the DPF upstream air intake pipe and the DPF downstream air intake pipe are right-angled elbows with inlets facing the direction of airflow in the DPF.
  • the preset monitoring release conditions include that the ambient pressure is within the preset pressure range, the ambient temperature is within the preset temperature range, the fuel level is greater than the preset liquid level limit, and the exhaust gas volume flow is within the preset flow range Internal, differential pressure sensor is ready, engine speed is within the preset speed range, fuel injection volume is within the preset injection volume range, carbon load is within the preset carbon load range, and none of the preset faults occur. condition.
  • the present application also proposes a monitoring device for dual DPF removal, which is applied to an engine aftertreatment system including dual DPFs.
  • the two DPFs are respectively provided with differential pressure sensors for detecting the upstream and downstream pressures and differential pressures of the DPF.
  • the device include:
  • the first acquisition module is configured to acquire the differential pressures of the two DPFs based on the differential pressure sensors respectively when the preset monitoring and release conditions are met;
  • the second acquisition module is configured to acquire the values of the two DPFs based on each differential pressure sensor if the differential pressure of the current DPF is less than the first preset differential pressure limit and the differential pressure of the other DPF is greater than the second preset differential pressure limit downstream pressure;
  • the accumulation module is set to start accumulating the monitoring time if the downstream pressure of the current DPF is greater than the downstream pressure of another DPF;
  • a determining module configured to determine that the current DPF is removed if the monitoring time is greater than a preset duration
  • the first preset pressure difference limit is less than or equal to the second preset pressure difference limit.
  • the device also includes a clearing module, which is set to:
  • the first acquisition module is also set to:
  • the monitoring time is not greater than the preset duration, determine whether the preset monitoring release condition is satisfied, and obtain the new pressure difference of the two DPFs based on each differential pressure sensor when the preset monitoring release condition is met .
  • the differential pressure sensor includes a DPF upstream air intake pipe and a DPF downstream air intake pipe, and the DPF upstream air intake pipe and the DPF downstream air intake pipe are right-angled elbows with inlets facing the direction of airflow in the DPF.
  • the present application also proposes an engine, including the monitoring device for double DPF removal as described above.
  • the application provides a monitoring method, device and engine for dual DPF removal.
  • the two DPFs are respectively provided with differential pressure sensors for detecting the differential pressure of the DPF and the downstream pressure.
  • the differential pressures of the two DPFs are respectively obtained based on the differential pressure sensors; if the differential pressure of the current DPF is less than the first preset differential pressure limit and the differential pressure of the other DPF is greater than the second preset differential pressure
  • the limit value is based on the downstream pressures of the two DPFs obtained by each differential pressure sensor; if the downstream pressure of the current DPF is greater than the downstream pressure of the other DPF, start accumulating the monitoring time; if the monitoring time is greater than the preset duration, determine that the current DPF is Removal; wherein, the first preset differential pressure limit is not greater than the second preset differential pressure limit, thereby improving the accuracy of double DPF removal monitoring.
  • FIG. 1 shows a schematic flow diagram of a monitoring method for double DPF removal proposed by an embodiment of the present application
  • Fig. 2 shows the layout diagram of the engine aftertreatment system in an embodiment of the present application
  • Fig. 3 shows a schematic diagram of the air intake method of the air intake pipe downstream of the DPF in an embodiment of the present application
  • FIG. 4 shows a schematic flowchart of a monitoring method for double DPF removal proposed in another embodiment of the present application
  • FIG. 5 shows a schematic structural diagram of a dual DPF removal monitoring device proposed by an embodiment of the present application.
  • NOX sensor 20. HC injection; 30. temperature sensor; 40. differential pressure sensor; 50. urea injection; 60. PM sensor.
  • Words such as “first” and “second” mentioned in this article are only for the convenience of describing two or more structures or components with the same or similar structure and/or function, and do not represent any order and/or importance. some special limit.
  • the embodiment of the present application provides a monitoring method for dual DPF removal, which is applied to an engine aftertreatment system including dual DPFs.
  • the two DPFs are respectively provided with differential pressure sensors for detecting the differential pressure of the DPF and the downstream pressure, as shown in the figure 1, the method includes the following steps:
  • Step S101 when the preset monitoring and release conditions are met, the differential pressures of the two DPFs are respectively obtained based on the differential pressure sensors.
  • the engine aftertreatment system of double DPF comprises two-way DOC (Diesel Oxidation Catalysis, diesel oxidation catalytic converter)+DPF arranged in parallel in parallel, and two DPFs are provided with differential pressure sensor respectively, and this differential pressure sensor can detect The pressure difference between the upstream and downstream of the DPF can also monitor the downstream pressure of the DPF.
  • DOC Diesel Oxidation Catalysis, diesel oxidation catalytic converter
  • DPFs are provided with differential pressure sensor respectively, and this differential pressure sensor can detect The pressure difference between the upstream and downstream of the DPF can also monitor the downstream pressure of the DPF.
  • the DPF removal monitoring can only be performed when the preset monitoring and release conditions are met, and the pressure difference of the two DPFs is obtained based on each differential pressure sensor.
  • the differential pressure sensor includes a DPF upstream air intake pipe and a DPF downstream air intake pipe, and the DPF upstream air intake pipe and the DPF downstream air intake pipe are inlets facing the DPF Right-angle elbow in the direction of airflow.
  • the air intake pipe upstream of the DPF and the air intake pipe downstream of the DPF are set as right-angled elbows with their inlets facing the direction of the airflow in the DPF.
  • the air intake method changes from static pressure to dynamic pressure. The pressure rise when the energy with velocity is converted to pressure without loss, improves the discrimination of the differential pressure with and without the DPF removed.
  • the air intake pipe for detecting the pressure downstream of the DPF and the air intake pipe for detecting the pressure difference downstream of the DPF share one air intake pipe.
  • the preset monitoring release conditions include that the ambient pressure is within the preset pressure range, the ambient temperature is within the preset temperature range, and the fuel level is greater than the preset liquid level limit , the exhaust gas volume flow rate is within the preset flow rate range, the differential pressure sensor is ready, the engine speed is within the preset speed range, the fuel injection volume is within the preset injection volume range, the carbon load is within the preset carbon load range, no Preset some or all of the conditions in which a fault occurs.
  • Step S102 if the pressure difference of the current DPF is less than the first preset pressure difference limit and the pressure difference of the other DPF is greater than the second preset pressure difference limit, respectively acquire the downstream pressures of the two DPFs based on the pressure difference sensors.
  • the first preset pressure difference limit is not greater than the second preset pressure difference limit, if the pressure difference of the current DPF is less than the first preset pressure difference limit and the pressure difference of another DPF is greater than the second preset pressure difference Setting the pressure difference limit indicates that there may be DPF removal, and it is also necessary to judge the downstream pressure of the DPF, and obtain the downstream pressures of the two DPFs based on the differential pressure sensors.
  • the first preset differential pressure limit value is the lower limit value of the differential pressure sensor
  • the second preset differential pressure limit value is the upper limit value of the differential pressure sensor
  • the lower limit value of the differential pressure and The upper limit of the pressure difference can be obtained through the look-up table of the exhaust gas flow rate and the current carbon load.
  • Step S103 if the downstream pressure of the current DPF is greater than the downstream pressure of another DPF, start accumulating the monitoring time.
  • the downstream pressure of the current DPF is greater than the downstream pressure of another DPF, it indicates that there is a high possibility of DPF removal, and the monitoring time starts to be accumulated at this time.
  • the method further includes:
  • Step S104 if the monitoring time is longer than the preset time, determine that the current DPF is removed.
  • a fault that the current DPF is removed is reported.
  • the method further includes:
  • the monitoring time is not greater than the preset duration, determine whether the preset monitoring release condition is satisfied, and obtain the new pressure difference of the two DPFs based on each differential pressure sensor when the preset monitoring release condition is met .
  • the monitoring time is not greater than the preset duration, it means that there is no DPF removal, and it is judged whether the preset monitoring and release conditions are met, and when the preset monitoring and release conditions are met, it is obtained based on each differential pressure sensor. The new differential pressure of the two DPFs to enter the monitoring of the next cycle DPF removal.
  • the preset duration is 20s.
  • the two DPFs are respectively equipped with differential pressure sensors for detecting the differential pressure of the DPF and the downstream pressure.
  • the differential sensor obtains the differential pressure of the two DPFs respectively; if the differential pressure of the current DPF is less than the first preset differential pressure limit and the differential pressure of the other DPF is greater than the second preset differential pressure limit, based on each differential pressure sensor respectively obtains The downstream pressure of the two DPFs; if the downstream pressure of the current DPF is greater than the downstream pressure of the other DPF, start accumulating the monitoring time; if the monitoring time is greater than the preset duration, determine that the current DPF is removed; wherein, the first preset The pressure difference limit is set not to be greater than the second preset pressure difference limit, thereby improving the accuracy of double DPF removal monitoring.
  • the exhaust after TC (turbine charger, turbocharger) is injected 20 through HC, two-way DOC+DPF, urea injection 50, two-way SCR (Selective Catalytic Reduction, Selective Catalytic Reduction Converter) + ASC (Ammonia Slip Catalyst, Ammonia Oxidation Catalyst) and then discharged.
  • a temperature sensor 30 is installed upstream of each DPF, and a differential pressure sensor 40 is installed in each DPF.
  • a NOX sensor 10 and a temperature sensor 30 are installed on the exhaust pipeline upstream of the DOC.
  • a temperature sensor 30 is provided, and a NOx sensor 10 , a temperature sensor 30 and a PM sensor 60 are provided in the exhaust pipe downstream of the ASC.
  • the air intake pipe downstream of the DPF is a right-angle elbow with the inlet facing the airflow direction in the DPF.
  • the embodiment of the present application provides a dual DPF removal monitoring method, using DPF (1) as the current DPF, and using DPF (2) as another DPF, as shown in Figure 4, including the following steps:
  • Step S201 start.
  • Step S202 whether the preset monitoring and release conditions are met, if so, execute step S203, otherwise, execute step S202.
  • the preset monitoring and release conditions are as follows: (it can be released if all or part of the conditions are met)
  • the ambient pressure is within the preset pressure range
  • the fuel injection quantity is within the preset injection quantity range
  • the carbon load is within the preset carbon load range
  • Step S203 the pressure difference of the DPF (1) is smaller than the first preset pressure difference limit and the pressure difference of the DPF (2) is greater than the second preset pressure difference limit. If yes, execute step S204, otherwise, execute step S205.
  • Step S204 enter downstream pressure judgment.
  • Execute step S206 enter downstream pressure judgment.
  • Step S205 clearing the monitoring time to zero.
  • Step S206 if the downstream pressure of DPF (1) is greater than the downstream pressure of DPF (2), execute step S207, otherwise execute step S205.
  • Step S207 start accumulating monitoring time.
  • Step S208 if the monitoring time is greater than the preset duration, execute step S209, otherwise execute step S202.
  • the monitoring time is greater than the preset duration (such as 20s), if it is lower than the preset duration, then enter the next cycle of DPF removal monitoring. If the monitoring time exceeds 20s, a DPF(1) removal fault will be reported.
  • the preset duration such as 20s
  • step S209 a DPF (1) removal failure is reported.
  • Step S210 end.
  • the embodiment of this application utilizes the principle of gas dynamic pressure and static pressure difference, changes the air intake method of the bleed pipe downstream of the double DPF, changes the static pressure into a dynamic pressure, and improves the difference between the pressure difference between the removed DPF and the non-removed DPF , making up for the influence of the sensor measurement error on the diagnosis result.
  • the embodiment of the present application also proposes a dual DPF removal monitoring device, which is applied to an engine aftertreatment system including a dual DPF.
  • the two DPFs are respectively provided with differential pressure sensors for detecting the upstream and downstream pressures and differential pressures of the DPF.
  • the device includes:
  • the first acquisition module 501 is configured to acquire the differential pressure of the two DPFs based on the differential pressure sensors when the preset monitoring and release conditions are met;
  • the second acquiring module 502 is configured to acquire two DPFs based on the differential pressure sensors respectively if the differential pressure of the current DPF is less than the first preset differential pressure limit and the differential pressure of another DPF is greater than the second preset differential pressure limit downstream pressure;
  • the accumulation module 503 is used to start accumulating the monitoring time if the downstream pressure of the current DPF is greater than the downstream pressure of another DPF;
  • a determining module 504 configured to determine that the current DPF is removed if the monitoring time is greater than a preset duration
  • the first preset pressure difference limit is not greater than the second preset pressure difference limit.
  • the device also includes a clearing module, which is used for:
  • the first acquisition module 501 is also used to:
  • the monitoring time is not greater than the preset duration, determine whether the preset monitoring release condition is satisfied, and obtain the new pressure difference of the two DPFs based on each differential pressure sensor when the preset monitoring release condition is met .
  • the differential pressure sensor includes a DPF upstream air intake pipe and a DPF downstream air intake pipe, and the DPF upstream air intake pipe and the DPF downstream air intake pipe are right-angled elbows whose inlets are facing the airflow direction in the DPF.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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Abstract

一种双DPF移除的监控方法，应用于包括双DPF的发动机后处理系统中，两个DPF中分别设置有用于检测DPF的压差和下游压力的压差传感器，该方法包括：在满足预设监控放行条件时，基于各压差传感器分别获取两个DPF的压差；若当前DPF的压差小于第一预设压差限值且另一个DPF的压差大于第二预设压差限值，基于各压差传感器分别获取两个DPF的下游压力；若当前DPF的下游压力大于另一DPF的下游压力，开始累加监控时间；若监控时间大于预设时长，确定当前DPF被移除；其中，第一预设压差限值不大于第二预设压差限值，从而提高了双DPF移除监控的准确性。还公开了一种双DPF移除的装置和一种发动机。

Description

双DPF移除的监控方法、装置和发动机
本申请要求于2022年01月10日提交中国专利局、申请号为202210019672.1、发明名称为“一种双DPF移除的监控方法、装置和发动机”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
本申请涉及汽车控制技术领域，例如涉及一种双DPF移除的监控方法、装置和发动机。
背景技术
在柴油机后处理系统中，需要利用DPF(diesel particulate filter，柴油颗粒物捕集器)来降低发动机颗粒排放。根据法规要求，要实时监控DPF移除。双DPF移除其中一个DPF，移除与未移除DPF压差的区分度不够，严重影响双DPF移除诊断的准确性。
发明内容
本申请提供一种双DPF移除的监控方法，能够处理双DPF移除监控的准确性低的情况。该方法应用于包括双DPF的发动机后处理系统中，两个DPF中分别设置有用于检测DPF的压差和下游压力的压差传感器，该方法包括：
在满足预设监控放行条件时，基于各压差传感器分别获取两个DPF的压差；
若当前DPF的压差小于第一预设压差限值且另一个DPF的压差大于第二预设压差限值，基于各压差传感器分别获取两个DPF的下游压力；
若当前DPF的下游压力大于另一DPF的下游压力，开始累加监控时间；
若所述监控时间大于预设时长，确定当前DPF被移除；
其中，所述第一预设压差限值不大于所述第二预设压差限值。
可选地，在开始累加监控时间之后，所述方法还包括：
若不存在当前DPF的压差小于所述第一预设压差限值且另一个DPF的压差大于所述第二预设压差限值，或不存在当前DPF的下游压力大于另一DPF的下游压力，将所述监控时间清零。
可选地，所述方法还包括：
若所述监控时间不大于所述预设时长，判断是否满足所述预设监控放行条件，并在满足所述预设监控放行条件时基于各压差传感器分别获取两个DPF的新的压差。
可选地，所述压差传感器包括DPF上游取气管和DPF下游取气管，DPF上游取气管和DPF下游取气管为入口正对DPF中气流方向的直角弯管。
可选地，所述预设监控放行条件为包括环境压力在预设压力范围内、环境温度在预设温度范围内、燃油液位大于预设液位限值、废气体积流量在预设流量范围内、压差传感器准备就绪、发动机转速在预设转速范围内、燃油喷射量在预设喷射量范围内、碳载量在预设载碳量范围内、无预设故障发生中的部分或全部条件。
本申请还提出一种双DPF移除的监控装置，应用于包括双DPF的发动机后处理系统中，两个DPF中分别设置有用于检测DPF上下游压力和压差的压差传感器，所述装置包括：
第一获取模块，设置为在满足预设监控放行条件时，基于各压差传感器分别获取两个DPF的压差；
第二获取模块，设置为若当前DPF的压差小于第一预设压差限值且另一个DPF的压差大于第二预设压差限值，基于各压差传感器分别获取两个DPF的下游压力；
累加模块，设置为若当前DPF的下游压力大于另一DPF的下游压力，开始累加监控时间；
确定模块，设置为若所述监控时间大于预设时长，确定当前DPF被移除；
其中，所述第一预设压差限值小于或等于所述第二预设压差限值。
可选地，所述装置还包括清零模块，设置为：
若不存在当前DPF的压差小于所述第一预设压差限值且另一个DPF的压差大于所述第二预设压差限值，或不存在当前DPF的下游压力大于另一DPF的下游压力，将所述监控时间清零。
可选地，所述第一获取模块还设置为：
若所述监控时间不大于所述预设时长，判断是否满足所述预设监控放行条件，并在满足所述预设监控放行条件时基于各压差传感器分别获取两个DPF的新的压差。
可选地，所述压差传感器包括DPF上游取气管和DPF下游取气管，DPF上游取气管和DPF下游取气管为入口正对DPF中气流方向的直角弯管。
本申请还提出一种发动机，包括如上所述的双DPF移除的监控装置。
本申请提供的双DPF移除的监控方法、装置和发动机，在包括双DPF的发动机后处理系统中，两个DPF中分别设置有用于检测DPF的压差和下游压力的压差传感器，在满足预设监控放行条件时，基于各压差传感器分别获取两个DPF的压差；若当前DPF的压差小于第一预设压差限值且另一个DPF的压差大于第二预设压差限值，基于各压差传感器分别获取两个DPF的下游压力；若当前DPF的下游压力大于另一DPF的下游压力，开始累加监控时间；若所述监控时间大于预设时长，确定当前DPF被移除；其中，所述第一预设压差限值不大于所述第二预设压差限值，从而提高了 双DPF移除监控的准确性。
附图说明
图1示出了本申请一实施例提出的一种双DPF移除的监控方法的流程示意图；
图2示出了本申请一实施例中发动机后处理系统布置图；
图3示出了本申请一实施例中DPF下游取气管取气方式示意图；
图4示出了本申请另一实施例提出的一种双DPF移除的监控方法的流程示意图；
图5示出了本申请一实施例提出的一种双DPF移除的监控装置的结构示意图。
其中，图2中的附图标记说明如下：
10、NOX传感器；20、HC喷射；30、温度传感器；40、压差传感器；50、尿素喷射；60、PM传感器。
具体实施方式
本文中所述“第一”、“第二”等词，仅是为了便于描述结构和/或功能相同或者相类似的两个以上的结构或者部件，并不表示对于顺序和/或重要性的某种特殊限定。
本申请实施例提供一种双DPF移除的监控方法，应用于包括双DPF的发动机后处理系统中，两个DPF中分别设置有用于检测DPF的压差和下游压力的压差传感器，如图1所示，该方法包括以下步骤：
步骤S101，在满足预设监控放行条件时，基于各压差传感器分别获取两个DPF的压差。
本实施例中，双DPF的发动机后处理系统中包括平行布置的两路DOC(Diesel Oxidation Catalysis，柴油氧化催化器)+DPF，两个DPF中分别设置有压差传感器，该压差传感器可检测DPF的上下游的压差，也可监测DPF的下游压力。
为了保证稳定性，在满足预设监控放行条件时才可进行DPF移除监控，基于各压差传感器分别获取两个DPF的压差。
为了进一步提高DPF移除的监控的准确性，在本申请一些实施例中，所述压差传感器包括DPF上游取气管和DPF下游取气管，DPF上游取气管和DPF下游取气管为入口正对DPF中气流方向的直角弯管。
本实施例中，将DPF上游取气管和DPF下游取气管设置为直角弯管且使其入口正对DPF中气流方向，取气方式由静压变成动压，动压为将气体因具有流动速度而具有的能量无损失地转换为压力时的压力升，提高了移除与未移除DPF压差的区分度。
示例性地，检测DPF下游压力的取气管和检测压差的DPF下游取气管共用一根取气管。
为了保证可靠性，在本申请一些实施例中，所述预设监控放行条件为包括环境压力在预设压力范围内、环境温度在预设温度范围内、燃油液位大于预设液位限值、废气体积流量在预设流量范围内、压差传感器准备就绪、发动机转速在预设转速范围内、燃油喷射量在预设喷射量范围内、碳载量在预设载碳量范围内、无预设故障发生中的部分或全部条件。
本领域技术人员也可选择其他预设监控放行条件，这并不影响本申请的保护范围。
步骤S102，若当前DPF的压差小于第一预设压差限值且另一个DPF的压差大于第二预设压差限值，基于各压差传感器分别获取两个DPF的下游压力。
本实施例中，第一预设压差限值不大于第二预设压差限值，若当前DPF的压差小于第一预设压差限值且另一个DPF的压差大于第二预设压差限值，说明可能存在DPF移除，还需要进行DPF下游压力的判断，基于各压差传感器分别获取两个DPF的下游压力。
可选的，第一预设压差限值为压差传感器的压差下限值，第二预设压差限值为压差传感器的压差上限值，所述压差下限值和压差上限值可通过废气体流量和当前碳载量查表得到。
步骤S103，若当前DPF的下游压力大于另一DPF的下游压力，开始累加监控时间。
本实施例中，若当前DPF的下游压力大于另一DPF的下游压力，说明存在DPF移除的可能性较大，此时开始累加监控时间。
为了进一步提高DPF移除的监控的准确性，在本申请一些实施例中，在开始累加监控时间之后，所述方法还包括：
若不存在当前DPF的压差小于所述第一预设压差限值且另一个DPF的压差大于所述第二预设压差限值，或不存在当前DPF的下游压力大于另一DPF的下游压力，将所述监控时间清零。
步骤S104，若所述监控时间大于预设时长，确定当前DPF被移除。
为了使用户及时确定当前DPF被移除，在本申请一些实施例中，在确定当前DPF被移除之后，报出当前DPF被移除的故障。
为了提高DPF移除的可靠性，在本申请一些实施例中，所述方法还包括：
若所述监控时间不大于所述预设时长，判断是否满足所述预设监控放行条件，并在满足所述预设监控放行条件时基于各压差传感器分别获取两个DPF的新的压差。
本实施例中，若所述监控时间不大于所述预设时长，说明不存在DPF移除，判断是否满足预设监控放行条件，并在满足预设监控放行条件时基于各压差传感器分别获取两个DPF的新的压差，以进入下一循环DPF移除的监控。
可选的，预设时长为20s。
通过应用以上技术方案，在包括双DPF的发动机后处理系统中，两个DPF中分别设置有用于检测DPF的压差和下游压力的压差传感器，在满足预设监控放行条件时，基于各压差传感器分别获取两个DPF的压差；若当前DPF的压差小于第一预设压差限值且另一个DPF的压差大于第二预设压差限值，基于各压差传感器分别获取两个DPF的下游压力；若当前DPF的下游压力大于另一DPF的下游压力，开始累加监控时间；若所述监控时间大于预设时长，确定当前DPF被移除；其中，所述第一预设压差限值不大于所述第二预设压差限值，从而提高了双DPF移除监控的准确性。
如图2所示为本申请实施例中发动机后处理系统布置图，TC(turbine charger，涡轮增压器)后的排气经HC喷射20、两路DOC+DPF、尿素喷 射50、两路SCR(Selective Catalytic Reduction，选择性催化还原转化器)+ASC(Ammonia Slip Catalyst，氨气氧化催化器)后排出。各DPF的上游分别设置有温度传感器30，各DPF中分别设置压差传感器40，另外，在DOC上游的排气管路上还设置有NOX传感器10、温度传感器30，SCR上游的排气管路中设置温度传感器30，在ASC下游的排气管路中设置NOX传感器10、温度传感器30和PM传感器60。
如图3所示，DPF下游取气管为入口正对DPF中气流方向的直角弯管。
本申请实施例提供一种双DPF移除的监控方法，将DPF(1)作为当前DPF，将DPF(2)作为另一个DPF，如图4所示，包括以下步骤：
步骤S201，开始。
步骤S202，是否满足预设监控放行条件，若是执行步骤S203，否则执行步骤S202。
预设监控放行条件如下：(满足全部或部分条件即可释放)
(1)环境压力在预设压力范围内；
(2)环境温度在预设温度范围内；
(3)燃油液位大于预设液位限值；
(4)废气体积流量在预设流量范围内；
(5)压差传感器准备就绪；
(6)发动机转速在预设转速范围内；
(7)燃油喷射量在预设喷射量范围内；
(8)碳载量在预设载碳量范围内；
(9)无预设故障发生。
步骤S203，DPF(1)的压差小于第一预设压差限值且DPF(2)的压差大于第二预设压差限值。若是执行步骤S204，否则执行步骤S205。
步骤S204，进入下游压力判断。执行步骤S206。
步骤S205，将监控时间清零。
步骤S206，DPF(1)的下游压力大于DPF(2)的下游压力，若是执行步骤S207，否则执行步骤S205。
步骤S207，开始累加监控时间。
步骤S208，监控时间大于预设时长，若是执行步骤S209，否则执行 步骤S202。
监控时间是否大于预设时长(如20s)，若低于该预设时长，则进入下一循环DPF移除监控。若监控时间超过20s，则报出DPF(1)移除故障。
步骤S209，报出DPF(1)移除故障。
步骤S210，结束。
本申请实施例利用了气体动压与静压差的原理，改变了双DPF下游的引气管取气方式，将静压改变成动压，提高了移除与未移除DPF压差的区分度，弥补了传感器测量误差对诊断结果的影响。
本申请实施例还提出了一种双DPF移除的监控装置，应用于包括双DPF的发动机后处理系统中，两个DPF中分别设置有用于检测DPF上下游压力和压差的压差传感器，如图5所示，所述装置包括：
第一获取模块501，用于在满足预设监控放行条件时，基于各压差传感器分别获取两个DPF的压差；
第二获取模块502，用于若当前DPF的压差小于第一预设压差限值且另一个DPF的压差大于第二预设压差限值，基于各压差传感器分别获取两个DPF的下游压力；
累加模块503，用于若当前DPF的下游压力大于另一DPF的下游压力，开始累加监控时间；
确定模块504，用于若所述监控时间大于预设时长，确定当前DPF被移除；
其中，所述第一预设压差限值不大于所述第二预设压差限值。
在本申请具体的应用场景中，所述装置还包括清零模块，用于：
若不存在当前DPF的压差小于所述第一预设压差限值且另一个DPF的压差大于所述第二预设压差限值，或不存在当前DPF的下游压力大于另一DPF的下游压力，将所述监控时间清零。
在本申请具体的应用场景中，第一获取模块501还用于：
若所述监控时间不大于所述预设时长，判断是否满足所述预设监控放行条件，并在满足所述预设监控放行条件时基于各压差传感器分别获取两个DPF的新的压差。
在本申请具体的应用场景中，所述压差传感器包括DPF上游取气管和 DPF下游取气管，DPF上游取气管和DPF下游取气管为入口正对DPF中气流方向的直角弯管。

Claims (10)

  1. 一种双DPF移除的监控方法，应用于包括双DPF的发动机后处理系统中，两个DPF中分别设置有用于检测DPF的压差和下游压力的压差传感器，所述方法包括：
    在满足预设监控放行条件时，基于各压差传感器分别获取两个DPF的压差；
    若当前DPF的压差小于第一预设压差限值且另一个DPF的压差大于第二预设压差限值，基于各压差传感器分别获取两个DPF的下游压力；
    若当前DPF的下游压力大于另一DPF的下游压力，开始累加监控时间；
    若所述监控时间大于预设时长，确定当前DPF被移除；
    其中，所述第一预设压差限值不大于所述第二预设压差限值。
  2. 如权利要求1所述的方法，其中，在开始累加监控时间之后，所述方法还包括：
    若不存在当前DPF的压差小于所述第一预设压差限值且另一个DPF的压差大于所述第二预设压差限值，或不存在当前DPF的下游压力大于另一DPF的下游压力，将所述监控时间清零。
  3. 如权利要求1所述的方法，还包括：
    若所述监控时间不大于所述预设时长，判断是否满足所述预设监控放行条件，并在满足所述预设监控放行条件时基于各压差传感器分别获取两个DPF的新的压差。
  4. 如权利要求1所述的方法，其中，所述压差传感器包括DPF上游 取气管和DPF下游取气管，DPF上游取气管和DPF下游取气管为入口正对DPF中气流方向的直角弯管。
  5. 如权利要求1所述的方法，其中，所述预设监控放行条件为环境压力在预设压力范围内、环境温度在预设温度范围内、燃油液位大于预设液位限值、废气体积流量在预设流量范围内、压差传感器准备就绪、发动机转速在预设转速范围内、燃油喷射量在预设喷射量范围内、碳载量在预设载碳量范围内、无预设故障发生中的部分或全部条件。
  6. 一种双DPF移除的监控装置，应用于包括双DPF的发动机后处理系统中，两个DPF中分别设置有用于检测DPF上下游压力和压差的压差传感器，所述装置包括：
    第一获取模块，设置为在满足预设监控放行条件时，基于各压差传感器分别获取两个DPF的压差；
    第二获取模块，设置为若当前DPF的压差小于第一预设压差限值且另一个DPF的压差大于第二预设压差限值，基于各压差传感器分别获取两个DPF的下游压力；
    累加模块，设置为若当前DPF的下游压力大于另一DPF的下游压力，开始累加监控时间；
    确定模块，设置为若所述监控时间大于预设时长，确定当前DPF被移除；
    其中，所述第一预设压差限值小于或等于所述第二预设压差限值。
  7. 如权利要求6所述的装置，其中，所述装置还包括清零模块，设置为：
    若不存在当前DPF的压差小于所述第一预设压差限值且另一个DPF的压差大于所述第二预设压差限值，或不存在当前DPF的下游压力大于另一DPF的下游压力，将所述监控时间清零。
  8. 如权利要求6所述的装置，其中，所述第一获取模块还设置为：
    若所述监控时间不大于所述预设时长，判断是否满足所述预设监控放行条件，并在满足所述预设监控放行条件时基于各压差传感器分别获取两个DPF的新的压差。
  9. 如权利要求6所述的装置，其中，所述压差传感器包括DPF上游取气管和DPF下游取气管，DPF上游取气管和DPF下游取气管为入口正对DPF中气流方向的直角弯管。
  10. 一种发动机，包括如权利要求6-9任一项所述的双DPF移除的监控装置。
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