CN112177714B - SCR system conversion rate monitoring method, device, equipment and storage medium - Google Patents

SCR system conversion rate monitoring method, device, equipment and storage medium Download PDF

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Publication number
CN112177714B
CN112177714B CN202011031469.3A CN202011031469A CN112177714B CN 112177714 B CN112177714 B CN 112177714B CN 202011031469 A CN202011031469 A CN 202011031469A CN 112177714 B CN112177714 B CN 112177714B
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scr system
conversion rate
monitoring
dpf
upstream
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CN112177714A (en
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解同鹏
李万洋
孙树矗
胡明飞
高翠
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—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
    • 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
    • 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
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Abstract

The embodiment of the invention provides a method, a device, equipment and a storage medium for monitoring the conversion rate of an SCR system, wherein the method comprises the following steps: if the Diesel Particulate Filter (DPF) of the vehicle enters a light-off stage in the parking regeneration process, judging whether the initial condition of the conversion rate monitoring of the SCR system is met; if the SCR system conversion rate monitoring initial condition is met, controlling to enter an SCR system conversion rate monitoring stage in the parking regeneration process, controlling the upstream temperature of the DPF to be maintained in a preset temperature interval after entering the SCR system conversion rate monitoring stage, and maintaining the upstream temperature of the SCR system in an optimal efficiency monitoring temperature interval when the upstream temperature of the DPF is maintained in the preset temperature interval; if the condition that the conversion rate monitoring release condition of the SCR system is met is determined, monitoring the quality of the nitric oxide on the upstream and the downstream of the SCR system to obtain a monitoring result; and calculating the conversion rate of the SCR system according to the monitoring result.

Description

SCR system conversion rate monitoring method, device, equipment and storage medium
Technical Field
The embodiment of the invention relates to the technical field of vehicles, in particular to a method, a device, equipment and a storage medium for monitoring the conversion rate of an SCR system.
Background
With the enhancement of environmental awareness, a selective catalytic reduction system (SCR system for short) is available in diesel vehicles. Through the SCR system, the reducing agent ammonia or urea can be sprayed in under the action of the catalyst to remove NO in the tail gas of the diesel vehiclexReduction to N2And H2O。
In order to determine whether the SCR system is functioning properly, the conversion rate of the SCR system needs to be monitored. At present, when the conversion rate of the SCR system is monitored, the monitoring is started only when the upstream temperature of the SCR system reaches the optimal monitoring interval temperature. Wherein, the optimal monitoring temperature can be 230-270 ℃.
However, for some vehicles with special purposes, such as sanitation vehicles and truck cranes, due to the fact that the vehicle running load is low, the aftertreatment exhaust temperature is low, and further the upstream temperature of the SCR system cannot meet the optimal monitoring interval temperature for monitoring the conversion rate of the SCR system, the conversion rate of the SCR system cannot be effectively monitored, and whether the SCR system is working normally or not and whether the exhaust emission meets the emission requirement or not cannot be effectively judged.
Disclosure of Invention
The embodiment of the invention provides a method, a device, equipment and a storage medium for monitoring the conversion rate of an SCR system, and solves the technical problem that whether the SCR system works normally or not and whether the emission tail gas meets the emission requirement or not because a vehicle with special purpose cannot effectively monitor the conversion rate of the SCR system in the prior art.
In a first aspect, an embodiment of the present invention provides a method for monitoring a conversion rate of an SCR system, including:
if the Diesel Particulate Filter (DPF) of the vehicle enters a light-off stage in the parking regeneration process, judging whether the initial condition of the conversion rate monitoring of the SCR system is met;
if the SCR system conversion rate monitoring initial condition is met, controlling to enter an SCR system conversion rate monitoring stage in the parking regeneration process, controlling the upstream temperature of the DPF to be maintained in a preset temperature interval after entering the SCR system conversion rate monitoring stage, and controlling the upstream temperature of the SCR system to be in an optimal efficiency monitoring temperature interval when the upstream temperature of the DPF is maintained in the preset temperature interval;
judging whether the SCR system conversion rate monitoring release condition is met;
if the condition that the conversion rate monitoring release condition of the SCR system is met is determined, monitoring the quality of the nitric oxide on the upstream and the downstream of the SCR system to obtain a monitoring result;
and calculating the conversion rate of the SCR system according to the monitoring result.
Optionally, the method as described above, the determining whether the SCR system conversion rate monitoring initial condition is satisfied includes:
judging whether the upstream temperature of the DPF is greater than or equal to a second preset temperature threshold value, wherein the second preset temperature threshold value is smaller than the first preset temperature threshold value;
if the upstream temperature of the DPF is determined to be greater than or equal to the second preset temperature threshold, judging whether an SCR system conversion rate monitoring request sent by an ECU is monitored;
if the SCR system conversion rate monitoring request is determined to be monitored, determining that the SCR system conversion rate monitoring initial condition is met;
and if the SCR system conversion rate monitoring request is determined not to be monitored, determining that the SCR system conversion rate monitoring initial condition is not met.
Optionally, the method as described above, after determining that the SCR system conversion monitoring initial condition is not satisfied, further comprising:
and controlling to enter a DPF regeneration stage in the parking regeneration process.
Optionally, the method for controlling the temperature of the DPF to be maintained at a preset temperature interval after entering the SCR system conversion monitoring stage comprises:
and after entering the SCR system conversion rate monitoring stage, controlling the upstream temperature of the DPF to rise by adopting a thermal management mode until the upstream temperature of the DPF reaches and is maintained in the preset temperature interval.
Optionally, the method for controlling the temperature increase of the upstream of the DPF in a thermal management manner until the temperature of the upstream of the DPF reaches and is maintained in the preset temperature interval comprises:
adjusting oil gas entering an aftertreatment system by adopting the thermal management mode to control the upstream temperature of the DPF to rise until the upstream temperature of the DPF reaches and is maintained in the preset temperature interval;
the heat management mode is any one or more of the following modes:
adjusting an air inlet throttle valve, adjusting rail pressure, adjusting a fuel injection advance angle, and opening a post-injection system or an HC injection system.
Optionally, the method as described above, after monitoring the quality of the nitrogen oxide generated upstream and downstream of the SCR system and obtaining the monitoring result, further includes:
and controlling to enter a DPF regeneration stage and a cooling stage in the parking regeneration process.
In a second aspect, an embodiment of the present invention provides an SCR system conversion rate monitoring apparatus, including:
the judging module is used for judging whether the initial condition of the SCR system conversion rate monitoring is met or not if the Diesel Particulate Filter (DPF) of the vehicle enters the ignition stage of the parking regeneration process;
the control module is used for controlling to enter an SCR system conversion rate monitoring stage in the parking regeneration process if the SCR system conversion rate monitoring initial condition is determined to be met, controlling the upstream temperature of the DPF to be maintained in a preset temperature interval after the SCR system conversion rate monitoring stage is entered, and maintaining the upstream temperature of the SCR system in an optimal efficiency monitoring temperature interval when the upstream temperature of the DPF is maintained in the preset temperature interval;
the judging module is also used for judging whether the SCR system conversion rate monitoring release condition is met;
the monitoring module is used for monitoring the quality of the nitric oxide on the upstream and the downstream of the SCR system to obtain a monitoring result if the conversion rate monitoring release condition of the SCR system is met;
and the calculation module is used for calculating the conversion rate of the SCR system according to the monitoring result.
Optionally, in the apparatus as described above, the determining module, when determining whether the SCR system conversion rate monitoring initial condition is satisfied, is specifically configured to:
judging whether the upstream temperature of the DPF is greater than or equal to a second preset temperature threshold value, wherein the second preset temperature threshold value is smaller than the first preset temperature threshold value; if the upstream temperature of the DPF is determined to be greater than or equal to the second preset temperature threshold, judging whether a SCR system conversion rate monitoring request is monitored; if the SCR system conversion rate monitoring request is determined to be monitored, determining that the SCR system conversion rate monitoring initial condition is met; and if the SCR system conversion rate monitoring request is determined not to be monitored, determining that the SCR system conversion rate monitoring initial condition is not met.
Optionally, in the apparatus described above, the control module is further configured to:
and controlling to enter a DPF regeneration stage in the parking regeneration process.
Optionally, in the apparatus as described above, the control module, when controlling the upstream temperature of the DPF to be maintained in a preset temperature range after entering the SCR system conversion monitoring stage, is specifically configured to:
and after entering the SCR system conversion rate monitoring stage, controlling the upstream temperature of the DPF to rise by adopting a thermal management mode until the upstream temperature of the DPF reaches and is maintained in the preset temperature interval.
Optionally, in the apparatus as described above, when the control module controls the temperature rise of the upstream of the DPF in a thermal management manner, the control module is specifically configured to:
adjusting oil gas entering an aftertreatment system by adopting the thermal management mode to control the temperature of the upstream of the DPF to rise until the temperature of the upstream of the DPF reaches and is maintained in the preset temperature interval;
the heat management mode is any one or more of the following modes:
adjusting an air inlet throttle valve, adjusting rail pressure, adjusting a fuel injection advance angle, and opening a post-injection system or an HC injection system.
Optionally, in the apparatus described above, the control module is further configured to:
and controlling to enter a DPF regeneration stage and a cooling stage in the parking regeneration process.
In a third aspect, an embodiment of the present invention provides an SCR system conversion rate monitoring device, including:
a memory, a processor, and a computer program;
wherein the computer program is stored in the memory and configured to be executed by the processor to implement the SCR system conversion monitoring method according to any one of the first aspect.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, the computer program being executed by a processor to implement the SCR system conversion rate monitoring method according to any one of the first aspect.
The embodiment of the invention provides a method, a device, equipment and a storage medium for monitoring the conversion rate of an SCR system, wherein if the condition that a Diesel Particulate Filter (DPF) of a vehicle enters a light-off stage in a parking regeneration process is monitored, whether the initial condition for monitoring the conversion rate of the SCR system is met is judged; if the SCR system conversion rate monitoring initial condition is met, controlling to enter an SCR system conversion rate monitoring stage in the parking regeneration process, controlling the upstream temperature of the DPF to be maintained in a preset temperature interval after entering the SCR system conversion rate monitoring stage, and maintaining the upstream temperature of the SCR system in an optimal efficiency monitoring temperature interval when the upstream temperature of the DPF is maintained in the preset temperature interval; judging whether the SCR system conversion rate monitoring release condition is met; if the condition that the conversion rate monitoring release condition of the SCR system is met is determined, monitoring the quality of the nitric oxide on the upstream and the downstream of the SCR system to obtain a monitoring result; and calculating the conversion rate of the SCR system according to the monitoring result. The characteristic that the DPF parking regeneration process period of a special-purpose vehicle is short can be utilized, an SCR system conversion rate monitoring stage can be added in each DPF parking regeneration process of the special-purpose vehicle, the upstream temperature of the SCR system is controlled within the optimal efficiency monitoring temperature range, effective monitoring of the SCR system conversion rate of the special-purpose vehicle is achieved, and whether the SCR system works normally or not and whether the exhaust emission meets the emission requirement or not is further effectively judged.
It should be understood that what is described in the summary above is not intended to limit key or critical features of embodiments of the invention, nor is it intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a DPF parking regeneration process in the prior art;
FIG. 2 is a flow chart of a method for monitoring conversion of an SCR system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a DPF parking regeneration process provided by an embodiment of the present invention;
FIG. 4 is a flow chart of a method for SCR system conversion monitoring according to another embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a conversion rate monitoring device of an SCR system according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an SCR system conversion rate monitoring device according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and the embodiments of the present invention are illustrative only and are not intended to limit the scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, and in the above-described drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
For a clear understanding of the technical solutions of the present application, a detailed description of the prior art solutions is first provided.
In the prior art, when monitoring the conversion rate of the SCR system, it is generally necessary to determine whether the conversion rate release condition of the SCR system is satisfied. Due to the optimal monitoring interval temperature, the conversion rate distinguishing degree between normal and fault of the SCR system can be the highest. Therefore, when judging whether the conversion rate release condition of the SCR system is met, the upstream temperature of the SCR system needs to be judged to reach the optimal monitoring interval temperature, and if the upstream temperature of the SCR system reaches the optimal monitoring interval temperature, the monitoring is started.
In a vehicle with a high vehicle-mounted operating load, the conversion release condition of the SCR system can be generally satisfied during the engine operation of the vehicle because the aftertreatment exhaust temperature is high. I.e. the temperature upstream of the SCR system can reach the optimum monitoring interval temperature. For some vehicles with special purposes, such as sanitation vehicles and truck-mounted cranes, the aftertreatment exhaust temperature is low due to low vehicle running load, and the upstream temperature of the SCR system cannot meet the optimal monitoring interval temperature for monitoring the conversion rate of the SCR system. Therefore, the conversion rate of the SCR system cannot be effectively monitored, so that whether the SCR system works normally or not cannot be effectively judged, and whether the exhaust gas meets the emission requirement or not can be judged.
Therefore, aiming at the technical problems that in the prior art, the conversion rate of an SCR system cannot be effectively monitored aiming at a vehicle with special use, so that whether the SCR system works normally or not and whether the exhaust gas meets the emission requirement or not cannot be effectively judged, the inventor finds that the carbon loading of the vehicle with special use is accumulated quickly due to low load and low post-treatment exhaust temperature when the vehicle with special use runs, and the DPF parking regeneration period of the vehicle with special use is short. The inventor finds that the DPF parking regeneration process of the special-purpose vehicle includes three stages, namely a light-off stage, a DPF regeneration stage and a cooling stage, as shown in fig. 1. From the light-off phase to the DPF regeneration phase, the temperature upstream of the DPF can rise from 150 degrees to about 600 degrees. When the upstream temperature of the DPF is about 300 ℃ in the process of increasing the upstream temperature of the DPF, the upstream temperature of the SCR system can be in the optimal efficiency monitoring temperature range. Monitoring of the SCR system conversion rate can be introduced using the DPF parking regeneration process of a particular vehicle. Optionally, an SCR system conversion monitoring phase may be introduced between the light-off phase and the DPF regeneration phase. If the diesel particulate filter catcher DPF of the vehicle is monitored to enter a light-off stage of a parking regeneration process, judging whether an SCR system conversion rate monitoring initial condition is met, if the SCR system conversion rate monitoring initial condition is determined to be met, controlling the parking regeneration process to enter an SCR system conversion rate monitoring stage, controlling the upstream temperature of the DPF to be maintained in a preset temperature interval after entering the SCR system conversion rate monitoring stage, and maintaining the upstream temperature of the SCR system in an optimal efficiency monitoring temperature interval when the upstream temperature of the DPF is maintained in the preset temperature interval. Secondly, judging whether the conversion rate monitoring release condition of the SCR system is met; and if the conversion rate monitoring release condition of the SCR system is met, monitoring the conversion rate of the SCR system. Therefore, for monitoring the conversion rate of the SCR system of the special-purpose vehicle, the characteristic that the period of the DPF parking regeneration process of the special-purpose vehicle is short can be utilized, the SCR system conversion rate monitoring stage can be added in each DPF parking regeneration process of the special-purpose vehicle, the upstream temperature of the SCR system is controlled in the optimal efficiency monitoring temperature range, the effective monitoring of the conversion rate of the SCR system of the special-purpose vehicle is realized, and whether the SCR system works normally or not and whether the exhaust tail gas meets the emission requirement or not is further effectively judged.
Embodiments of the present invention are described below in detail with reference to the accompanying drawings
Example one
Fig. 2 is a flowchart of a method for monitoring conversion rate of an SCR system according to an embodiment of the present invention, and as shown in fig. 2, an implementation subject of the embodiment is an SCR system conversion rate monitoring device, which may be integrated in an electronic device. The SCR system conversion rate monitoring method provided by the present embodiment includes the following steps.
Step 101, if it is monitored that a Diesel Particulate Filter (DPF) of a vehicle enters a light-off stage of a parking regeneration process, whether initial conditions for monitoring the conversion rate of an SCR system are met is judged.
In this embodiment, the SCR system conversion rate monitoring device may be in communication with the DPF to monitor whether the DPF enters the parking regeneration process. Specifically, when the ECU determines that the carbon loading of the DPF is larger than a preset threshold value and the vehicle stops, the parking regeneration switch is controlled to be closed, so that the DPF enters a parking regeneration process. Therefore, if the SCR system conversion rate monitoring device monitors that the parking regeneration switch is closed, the DPF is determined to enter the parking regeneration process.
As shown in fig. 3, the DPF parking regeneration process in this embodiment may include four stages, which are a light-off stage, an SCR system conversion rate monitoring stage, a DPF regeneration stage and a cooling stage. Wherein the SCR system conversion monitoring phase is located between the light-off phase and the DPF regeneration phase.
After the DPF enters the parking regeneration process, the SCR system conversion rate monitoring device monitors whether the DPF enters a light-off stage in the parking regeneration process, for example, if it is monitored that the upstream temperature of the DPF reaches the initial temperature of the light-off stage, it is determined that the DPF enters the light-off stage in the parking regeneration process. For example, as shown in FIG. 3, the initial temperature during the light-off phase may be 150 degrees. Or if the parking regeneration switch is monitored to be closed, directly determining that the DPF enters a light-off stage in the parking regeneration process. In this embodiment, the manner of monitoring whether the DPF enters the light-off phase in the parking regeneration process is not limited.
And after the fact that the DPF enters a light-off stage in the parking regeneration process is monitored, judging whether the initial condition of SCR system conversion rate monitoring is met. The determining whether the SCR system conversion rate monitoring initial condition is satisfied may be determining whether an upstream temperature of the DPF reaches an initial temperature at which the SCR system conversion rate monitoring stage is entered. Or whether the initial condition of monitoring the conversion rate of the SCR system is met or not can be judged by judging whether an SCR system conversion rate monitoring request sent by the ECU is received or not. Or whether the initial condition of monitoring the conversion rate of the SCR system is met or not can be judged, namely whether the upstream temperature of the DPF reaches the initial temperature entering the stage of monitoring the conversion rate of the SCR system or not is judged, and whether an SCR system conversion rate monitoring request sent by an ECU is received or not is judged. In this embodiment, the manner of determining whether the initial condition for monitoring the conversion rate of the SCR system is satisfied is not limited.
Specifically, in the present embodiment, when the ECU determines whether or not to send a monitoring request to the SCR system conversion rate monitoring device: whether the running time of the engine is greater than a preset limit value or not can be judged; or whether the vehicle mileage is larger than a preset limit value or not can be judged; or it may be determined whether the total fuel consumption is greater than a preset limit.
And 102, if the condition that the initial condition of monitoring the conversion rate of the SCR system is met is determined, controlling the parking regeneration process to enter the stage of monitoring the conversion rate of the SCR system, controlling the upstream temperature of the DPF to be maintained in a preset temperature interval after the stage of monitoring the conversion rate of the SCR system is entered, and maintaining the upstream temperature of the SCR system in an optimal efficiency monitoring temperature interval when the upstream temperature of the DPF is maintained in the preset temperature interval.
Specifically, in the present embodiment, since the SCR system is downstream of the DPF, the temperature is lowered when the gas flows from the DPF to the SCR system, and therefore, the temperature upstream of the DPF is higher than the temperature upstream of the SCR system. Therefore, in the present embodiment, when the upstream temperature of the SCR system is maintained in the optimum efficiency monitoring temperature zone, the zone in which the upstream temperature of the DPF is present is determined in advance, and the zone in which the upstream temperature of the DPF is present is determined as the preset temperature zone.
Illustratively, if the optimum efficiency monitoring temperature interval of the SCR upstream temperature is 230-.
Therefore, in the present embodiment, when it is determined that the SCR system conversion rate monitoring initial condition is satisfied, the DPF is controlled to enter the SCR system conversion rate monitoring phase from the light-off phase in the parking regeneration process. After entering the SCR system conversion rate monitoring stage, the temperature of the DPF upstream can be raised in a heat management mode or other modes until the temperature is raised to a preset temperature interval and maintained in the preset temperature interval, and then the temperature of the SCR system upstream is maintained in the optimal efficiency monitoring temperature interval.
And 103, judging whether the SCR system conversion rate monitoring release condition is met.
Specifically, in the present embodiment, when the upstream temperature of the DPF is in the preset temperature zone, the upstream temperature of the SCR system is already in the optimum efficiency monitoring temperature zone, but it is necessary to determine whether the SCR system conversion rate monitoring release condition is satisfied.
When the SCR system conversion rate monitoring release condition is judged to be satisfied, the method may include:
judging whether a plurality of preset relevant parameters of the SCR system meet corresponding preset conditions or not; if a plurality of preset relevant parameters of the SCR system are determined to meet corresponding preset conditions, determining that the SCR system conversion rate monitoring release conditions are met; and if the plurality of preset relevant parameters of the SCR system do not meet the corresponding preset conditions, determining that the SCR system conversion rate monitoring release conditions are not met.
Specifically, the determining whether a plurality of preset relevant parameters of the SCR system satisfy corresponding preset conditions includes: judging whether the acquisition values of an upstream sensor and a downstream sensor of the SCR system are effective or not; judging whether the concentration of nitrogen oxides at the upstream of the SCR is within a preset concentration range; and determining whether the exhaust gas mass flow is within a preset flow range. And if the acquisition values of the upstream and downstream sensors of the SCR system are effective, the concentration of nitrogen oxides at the upstream of the SCR is within a preset concentration range, and the mass flow of the exhaust gas is within a preset flow range, determining that the corresponding preset conditions are met, and further determining that the conversion rate monitoring release conditions of the SCR system are met. Otherwise, determining that the corresponding preset conditions are not met, and further determining that the SCR system conversion rate monitoring release conditions are not met.
Wherein, the preset concentration range can be 50-1500ppm, and the preset flow range can be 350-1600 Kg/h.
It is understood that the preset related parameters may also include other parameters, which are not limited in this embodiment.
And 104, if the condition that the conversion rate monitoring release condition of the SCR system is met is determined, monitoring the mass of the nitric oxide on the upstream and the downstream of the SCR system to obtain a monitoring result.
Specifically, in this embodiment, when monitoring the quality of the nitrogen oxide in the upstream and downstream of the SCR system to obtain the monitoring result, the monitoring method may include:
respectively integrating the mass flow of the upstream nitrogen oxide and the mass flow of the downstream nitrogen oxide of the SCR system to correspondingly obtain a mass value of the upstream nitrogen oxide and a mass value of the downstream nitrogen oxide; if the upstream NOx mass value is determined to be the predetermined mass threshold, the upstream NOx mass value and the corresponding downstream NOx mass value are determined as the monitoring result.
Illustratively, the mass flow of the upstream nitrogen oxide NOx of the SCR system is integrated to obtain an upstream nitrogen oxide mass value of m 1. The mass flow of the downstream nitrogen oxides NOx of the SCR system is integrated to obtain a downstream nitrogen oxides mass value of m 2. And judging whether m1 is equal to a preset quality threshold value m, and if m1 is equal to the preset quality threshold value m, taking m1 and m2 at the moment as monitoring results.
The preset quality threshold m may be 15g or other values, which is not limited in this embodiment.
And 105, calculating the conversion rate of the SCR system according to the monitoring result.
Specifically, in the present embodiment, the conversion rate of the SCR system can be calculated according to equation (1).
SCR conversion efficiency (m1-m2)/m1 formula (1)
In the method for monitoring the conversion rate of the SCR system provided by this embodiment, if it is monitored that the DPF of the diesel particulate filter of the vehicle enters the light-off stage in the parking regeneration process, it is determined whether the initial condition for monitoring the conversion rate of the SCR system is satisfied; if the conversion rate monitoring initial condition of the SCR system is met, controlling to enter an SCR system conversion rate monitoring stage in the parking regeneration process, controlling the upstream temperature of the DPF to be in a preset temperature interval after entering the SCR system conversion rate monitoring stage, and controlling the upstream temperature of the SCR system to be in an optimal efficiency monitoring temperature interval when the upstream temperature of the DPF is in the preset temperature interval; judging whether the SCR system conversion rate monitoring release condition is met; if the condition that the conversion rate monitoring release condition of the SCR system is met is determined, monitoring the quality of the nitric oxide on the upstream and the downstream of the SCR system to obtain a monitoring result; and calculating the conversion rate of the SCR system according to the monitoring result. The characteristic that the DPF parking regeneration process period of a special-purpose vehicle is short can be utilized, an SCR system conversion rate monitoring stage can be added in each DPF parking regeneration process of the special-purpose vehicle, the upstream temperature of the SCR system is controlled within the optimal efficiency monitoring temperature range, effective monitoring of the SCR system conversion rate of the special-purpose vehicle is achieved, and whether the SCR system works normally or not and whether the exhaust emission meets the emission requirement or not is further effectively judged.
Example two
Fig. 4 is a flowchart of an SCR system conversion rate monitoring method according to another embodiment of the present invention, and as shown in fig. 4, the SCR system conversion rate monitoring method according to this embodiment further refines steps 101 to 105 on the basis of the SCR system conversion rate monitoring method according to the first embodiment of the present invention, and further includes a step of controlling to enter a DPF regeneration stage in the parking regeneration process after determining that the SCR system conversion rate monitoring initial condition is not satisfied, and a step of monitoring an upstream and downstream nitrogen oxide substance amount of the SCR system to obtain a monitoring result, and then controlling to enter the DPF regeneration stage and a cooling stage in the parking regeneration process. The SCR system conversion rate monitoring method provided by the present embodiment includes the following steps.
Step 201, monitoring whether a Diesel Particulate Filter (DPF) of a vehicle enters a light-off stage in a parking regeneration process, if so, executing step 202, otherwise, ending.
Alternatively, in the present embodiment, when the ECU detects that the DPF carbon loading is greater than the preset threshold value, a notification is issued to the driver to perform DPF parking regeneration, in which the driver is instructed to drive the vehicle to a suitable place and stop. The DPF of the vehicle is controlled to enter a light-off phase of the parking regeneration process after the driver presses the parking regeneration switch. And after the SCR system conversion rate monitoring device monitors that the parking regeneration switch is closed, determining that the DPF enters a light-off stage in the parking regeneration process.
The pre-set threshold of DPF carbon loading amount can be 4 g/L.
In this embodiment, the vehicle is made to enter the light-off stage by pressing the parking regeneration switch, and when the SCR system conversion rate monitoring device monitors whether the DPF enters the light-off stage in the parking regeneration process, it is only necessary to monitor the state of the parking regeneration switch without monitoring the upstream temperature of the DPF to the initial temperature of the light-off stage, and it is possible to monitor whether the DPF enters the light-off state quickly and accurately.
Step 202, judging whether the upstream temperature of the DPF is greater than or equal to a second preset temperature threshold, if so, executing step 203, otherwise, returning to continue executing step 202.
Specifically, in this embodiment, after the vehicle enters the light-off phase, the upstream temperature of the DPF is measured, and whether the upstream temperature of the DPF is greater than or equal to the second preset temperature threshold is determined, and if the condition that the upstream temperature of the DPF is greater than or equal to the second preset temperature threshold is satisfied, it is described that the upstream temperature of the DPF reaches the initial temperature that can enter the SCR system conversion rate monitoring phase, and in order to determine whether the SCR system conversion rate monitoring phase can be entered, the next determination process may be further performed.
The second preset temperature threshold may be 250 ℃.
Step 203, judging whether an SCR system conversion rate monitoring request sent by the ECU is monitored, if so, executing step 204, otherwise, executing step 205.
In this embodiment, the SCR system conversion rate monitoring device may be in communication connection with the ECU, and the ECU may determine a certain parameter indicating a driving time of the vehicle, compare the parameter with a corresponding preset threshold, and if the parameter is greater than the corresponding preset threshold, indicate that the SCR system of the vehicle has been used for a long time and the conversion rate of the SCR system needs to be monitored, send an SCR system conversion rate monitoring request to the SCR system conversion rate monitoring device by the ECU.
When the ECU determines whether to send a monitoring request to the SCR system conversion rate monitoring device, the certain parameter indicating the driving time of the vehicle may be an engine operation time, a vehicle mileage, a total fuel consumption amount, or the like. The ECU judges whether to send a monitoring request to an SCR system conversion rate monitoring device or not, and specifically can judge whether the running time of the engine is greater than a preset limit value or not; or whether the vehicle mileage is larger than a preset limit value or not can be judged; or it may be determined whether the total fuel consumption is greater than a preset limit. And if so, sending a monitoring request to an SCR system conversion rate monitoring device.
And step 204, determining that the initial condition for monitoring the conversion rate of the SCR system is met.
After step 204 is performed, step 206 is performed.
In this embodiment, the condition that the initial condition for monitoring the conversion rate of the SCR system is satisfied includes that the upstream temperature of the DPF is greater than or equal to the second preset temperature threshold and that there is a request for monitoring the conversion rate of the SCR system, and when the upstream temperature of the DPF is greater than or equal to the second preset temperature threshold, it indicates that the current DPF has the ability to enter the stage for monitoring the conversion rate of the SCR system, and there is a request for monitoring the conversion rate of the SCR system, which indicates that there is a request for monitoring the conversion rate of the SCR system, and it is also necessary to monitor the conversion rate of the SCR system by entering the stage for monitoring the conversion rate of the SCR system. It is determined that the SCR system conversion monitoring initial condition is satisfied when the upstream temperature of the DPF is greater than or equal to the second preset temperature threshold and there is an SCR system conversion monitoring request. And controlling to enter an SCR system conversion rate monitoring stage in the parking regeneration process.
And step 205, determining that the SCR system conversion rate monitoring initial condition is not met, and controlling to enter a DPF regeneration stage in the parking regeneration process.
In this embodiment, if the upstream temperature of the DPF is not satisfied and is greater than or equal to the second preset temperature threshold, waiting for a preset time, and continuing to perform the determination; if the upstream temperature of the DPF is greater than or equal to the second preset temperature threshold value but no efficiency monitoring request exists, the fact that the vehicle does not have the SCR system conversion rate monitoring requirement is indicated, and the DPF of the vehicle enters a parking regeneration stage.
And step 206, controlling to enter an SCR system conversion rate monitoring stage in the parking regeneration process, and controlling the upstream temperature of the DPF to be maintained in a preset temperature interval after entering the SCR system conversion rate monitoring stage.
When the upstream temperature of the DPF is in a preset temperature interval, the upstream temperature of the SCR system is in an optimal efficiency monitoring temperature interval.
Optionally, in step 206, controlling the upstream temperature of the DPF to be maintained in a preset temperature interval after entering the SCR system conversion monitoring stage specifically includes:
and after entering the SCR system conversion rate monitoring stage, controlling the upstream temperature of the DPF to rise by adopting a thermal management mode until the upstream temperature of the DPF reaches and is maintained in a preset temperature interval.
As an alternative embodiment, controlling the temperature rise of the upstream of the DPF by using a thermal management manner until the temperature of the upstream of the DPF reaches and is maintained in a preset temperature interval specifically comprises:
and adjusting oil gas entering the aftertreatment system by adopting a thermal management mode to control the upstream temperature of the DPF to rise until the upstream temperature of the DPF reaches and is maintained in the preset temperature interval.
Wherein, the heat management mode is any one or more of the following modes:
adjusting an air inlet throttle valve, adjusting rail pressure, adjusting a fuel injection advance angle, and opening a post-injection system or an HC injection system.
Specifically, in the embodiment, after entering the SCR system conversion rate monitoring phase, in order to maintain the upstream temperature of the SCR system in the optimum efficiency monitoring temperature range in the SCR system conversion rate monitoring phase, the upstream temperature of the DPF is controlled to increase in a thermal management manner, and after increasing to the preset temperature range, the upstream temperature of the DPF is fluctuated in the preset temperature range and maintained in the preset temperature range.
Specifically, the thermal management mode is to adjust oil gas entering the aftertreatment system, and if the SCR system conversion rate monitoring stage is just started from the ignition stage, the oil gas entering the aftertreatment system can be increased, so that the DPF is rapidly heated and reaches a preset temperature range. After the preset temperature interval is reached, in order to further maintain the preset temperature interval, the oil gas entering the post-treatment system can be regulated, and the upstream of the DPF is always maintained in the preset temperature interval at the later stage of the conversion rate monitoring stage of the SCR system.
Step 207, determining whether the SCR system conversion rate monitoring release condition is met, if yes, executing step 208, otherwise, after waiting for a first preset time, continuing to execute step 207, and if the first preset time is exceeded, executing step 210.
In this embodiment, the implementation manner of determining whether the SCR system conversion rate monitoring release condition is satisfied is similar to that of step 103 in the first embodiment of the present invention, and is not described in detail here.
It should be noted that if it is determined that the SCR system conversion rate monitoring release condition is not satisfied, after the first preset time, it is continuously determined whether the SCR system conversion rate monitoring release condition is satisfied, and if the SCR system conversion rate monitoring release condition is not satisfied within the second preset time, the SCR system conversion rate is not monitored, and step 210 is executed.
And 208, monitoring the quality of the nitric oxide on the upstream and the downstream of the SCR system to obtain a monitoring result.
And step 209, calculating the conversion rate of the SCR system according to the monitoring result.
In this embodiment, the implementation manners of step 208 to step 209 are similar, and are not described in detail here.
It is understood that if the calculated conversion rate of the SCR system is less than the preset safety threshold, a SCR system conversion rate fault message may be issued. So that the driver can quickly perform the maintenance of the SCR system after determining that the conversion rate of the SCR system is failed.
And step 210, controlling to enter a DPF regeneration stage and a cooling stage in the parking regeneration process in sequence.
In this embodiment, after the conversion rate monitoring of the SCR system is finished, or the conversion rate monitoring release condition of the SCR system is not satisfied, the DPF regeneration stage and the cooling stage in the parking regeneration process are controlled to be entered in sequence.
In the SCR system conversion rate monitoring method provided in this embodiment, when determining whether the SCR system conversion rate monitoring initial condition is satisfied, it is determined whether the upstream temperature of the DPF is greater than or equal to a second preset temperature threshold, where the second preset temperature threshold is smaller than the first preset temperature threshold; if the upstream temperature of the DPF is determined to be greater than or equal to a second preset temperature threshold value, judging whether an SCR system conversion rate monitoring request sent by an ECU is monitored; if the SCR system conversion rate monitoring request is determined to be monitored, determining that the SCR system conversion rate monitoring initial condition is met; and if the SCR system conversion rate monitoring request is determined not to be monitored, determining that the SCR system conversion rate monitoring initial condition is not met. Can have at present DPF to have the ability to enter into SCR system conversion rate control stage to when the affirmation of vehicle has SCR system conversion rate control demand, just confirm to satisfy SCR system conversion rate control initial condition, can confirm more accurately whether enter into SCR system conversion rate control stage, and can make SCR system conversion rate control more timely, do not take place to leave over.
In the SCR system conversion rate monitoring method provided in this embodiment, after the SCR system conversion rate monitoring stage is started, when the upstream temperature of the DPF is controlled to be maintained in the preset temperature interval, the upstream temperature of the DPF is controlled to be raised in a thermal management manner until the upstream temperature of the DPF reaches and is maintained in the preset temperature interval. Since the thermal management mode is more rapid and flexible, the upstream temperature of the DPF can be maintained more stably in a preset temperature interval. And thermal management is by any one or more of the following: adjusting an air inlet throttle valve, adjusting rail pressure, adjusting a fuel injection advance angle, and opening a post-injection system or an HC injection system. Thermal management can be performed more flexibly.
EXAMPLE III
Fig. 5 is a schematic structural diagram of an SCR system conversion rate monitoring device according to an embodiment of the present invention, and as shown in fig. 5, the SCR system conversion rate monitoring device 30 according to this embodiment includes: a judging module 31, a control module 32, a monitoring module 33 and a calculating module 34.
The determining module 31 is configured to determine whether an initial condition for monitoring a conversion rate of the SCR system is satisfied if it is monitored that the DPF of the diesel particulate filter of the vehicle enters a light-off stage of a parking regeneration process. And the control module 32 is configured to, if it is determined that the SCR system conversion monitoring initial condition is met, control to enter an SCR system conversion monitoring stage in the parking regeneration process, control the upstream temperature of the DPF to be maintained in a preset temperature range after entering the SCR system conversion monitoring stage, and maintain the upstream temperature of the SCR system in an optimal efficiency monitoring temperature range when the upstream temperature of the DPF is maintained in the preset temperature range. The judging module 31 is further configured to judge whether a SCR system conversion rate monitoring release condition is met. And the monitoring module 33 is configured to monitor the amount of nitrogen oxide in the upstream and downstream of the SCR system to obtain a monitoring result if it is determined that the SCR system conversion rate monitoring release condition is satisfied. And the calculation module 34 is used for calculating the conversion rate of the SCR system according to the monitoring result.
The SCR system conversion rate monitoring apparatus provided in this embodiment may implement the technical solution of the method embodiment shown in fig. 2, and the implementation principle and the technical effect are similar, which are not described herein again.
Optionally, the determining module 31, when determining whether the SCR system conversion rate monitoring initial condition is satisfied, is specifically configured to:
judging whether the upstream temperature of the DPF is greater than or equal to a second preset temperature threshold value, wherein the second preset temperature threshold value is smaller than the first preset temperature threshold value; if the upstream temperature of the DPF is determined to be greater than or equal to a second preset temperature threshold value, judging whether a SCR system conversion rate monitoring request is monitored; if the SCR system conversion rate monitoring request is determined to be monitored, determining that the SCR system conversion rate monitoring initial condition is met; and if the SCR system conversion rate monitoring request is determined not to be monitored, determining that the SCR system conversion rate monitoring initial condition is not met.
Optionally, the control module 32 is further configured to:
and controlling to enter a DPF regeneration stage in the parking regeneration process.
Optionally, the control module 32, when controlling the upstream temperature of the DPF to be maintained in a preset temperature interval after entering the SCR system conversion rate monitoring stage, is specifically configured to:
and after entering the SCR system conversion rate monitoring stage, controlling the upstream temperature of the DPF to rise by adopting a thermal management mode until the upstream temperature of the DPF reaches and is maintained in a preset temperature interval.
Optionally, the control module 32 is configured to control the temperature rise of the upstream of the DPF in a thermal management manner, and is specifically configured to:
adjusting oil gas entering the post-treatment system by adopting the thermal management mode to control the upstream temperature of the DPF to rise until the upstream temperature of the DPF reaches and is maintained in a preset temperature interval;
the heat management mode is any one or more of the following modes:
adjusting an air inlet throttle valve, adjusting rail pressure, adjusting a fuel injection advance angle, and opening a post-injection system or an HC injection system.
Optionally, the control module 32 is further configured to:
and controlling to enter a DPF regeneration stage and a cooling stage in the parking regeneration process.
The SCR system conversion rate monitoring apparatus provided in this embodiment may implement the technical solution of the method embodiment shown in fig. 4, and the implementation principle and the technical effect are similar, which are not described herein again.
The invention also provides SCR system conversion rate monitoring equipment and a computer readable storage medium according to the embodiment of the invention.
Fig. 6 is a schematic structural diagram of an SCR system conversion rate monitoring device according to an embodiment of the present invention. The SCR system conversion monitoring device is intended for various forms of digital computers such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other suitable computers. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 6, the electronic apparatus includes: a processor 401, a memory 402. The various components are interconnected using a bus and may be mounted on a common motherboard or in other manners as desired. The processor may process instructions for execution within the electronic device.
The memory 402 is a computer readable storage medium provided by the present invention. The memory stores instructions executable by the at least one processor to cause the at least one processor to perform the method for determining the cooling characteristic data of the whole vehicle provided by the invention. The computer readable storage medium of the present invention stores computer instructions for causing a computer to execute the method for determining cooling characteristic data of a whole vehicle provided by the present invention.
The memory 402 may be used as a computer-readable storage medium for storing non-transitory software programs, non-transitory computer-executable programs, and modules, such as program instructions/modules (e.g., the determination module 31, the control module 32, the monitoring module 33, and the calculation module 34 shown in fig. 5) corresponding to the method for determining the cooling characteristic data of the whole vehicle according to the embodiment of the present invention. The processor 401 executes various functional applications of the server and data processing by running non-transitory software programs, instructions and modules stored in the memory 402, namely, implements the entire vehicle cooling characteristic data determination method in the above-described method embodiment.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the embodiments of the invention following, in general, the principles of the embodiments of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the embodiments of the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of embodiments of the invention being indicated by the following claims.
It is to be understood that the embodiments of the present invention are not limited to the precise arrangements described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of embodiments of the invention is limited only by the appended claims.

Claims (10)

1. An SCR system conversion monitoring method, comprising:
if the Diesel Particulate Filter (DPF) of the vehicle enters a light-off stage in the parking regeneration process, judging whether the initial condition of the conversion rate monitoring of the SCR system is met;
if the SCR system conversion rate monitoring initial condition is met, controlling to enter an SCR system conversion rate monitoring stage in the parking regeneration process, controlling the upstream temperature of the DPF to be maintained in a preset temperature interval after entering the SCR system conversion rate monitoring stage, and maintaining the upstream temperature of the SCR system in an optimal efficiency monitoring temperature interval when the upstream temperature of the DPF is maintained in the preset temperature interval;
judging whether the SCR system conversion rate monitoring release condition is met;
if the condition that the conversion rate monitoring release condition of the SCR system is met is determined, monitoring the quality of the nitric oxide on the upstream and the downstream of the SCR system to obtain a monitoring result;
and calculating the conversion rate of the SCR system according to the monitoring result.
2. The method of claim 1, wherein said determining whether SCR system conversion monitoring initiation conditions are met comprises:
judging whether the upstream temperature of the DPF is greater than or equal to a second preset temperature threshold value, wherein the second preset temperature threshold value is smaller than the first preset temperature threshold value;
if the upstream temperature of the DPF is determined to be greater than or equal to the second preset temperature threshold, judging whether an SCR system conversion rate monitoring request sent by an ECU is monitored;
if the SCR system conversion rate monitoring request is determined to be monitored, determining that the SCR system conversion rate monitoring initial condition is met;
and if the SCR system conversion rate monitoring request is determined not to be monitored, determining that the SCR system conversion rate monitoring initial condition is not met.
3. The method of claim 2, wherein after determining that the SCR system conversion monitoring initial condition is not satisfied, further comprising:
and controlling to enter a DPF regeneration stage in the parking regeneration process.
4. The method as claimed in any one of claims 1-3, wherein said controlling the temperature upstream of the DPF to be maintained at a preset temperature interval after entering the SCR system conversion monitoring stage comprises:
and after entering the SCR system conversion rate monitoring stage, controlling the upstream temperature of the DPF to rise by adopting a thermal management mode until the upstream temperature of the DPF reaches and is maintained in the preset temperature interval.
5. The method of claim 4, wherein the controlling the temperature rise upstream of the DPF in a thermal management manner until the temperature upstream of the DPF reaches and is maintained within the preset temperature interval comprises:
adjusting oil gas entering an aftertreatment system by adopting the thermal management mode to control the temperature of the upstream of the DPF to rise until the temperature of the upstream of the DPF reaches and is maintained in the preset temperature interval;
the heat management mode is any one or more of the following modes:
adjusting an air inlet throttle valve, adjusting rail pressure, adjusting a fuel injection advance angle, and opening a post-injection system or an HC injection system.
6. The method according to any one of claims 1 to 3, wherein the monitoring of the amount of nitrogen oxides upstream and downstream of the SCR system, after obtaining the monitoring result, further comprises:
and controlling to enter a DPF regeneration stage and a cooling stage in the parking regeneration process.
7. An SCR system conversion monitoring device, comprising:
the judging module is used for judging whether the initial condition of the SCR system conversion rate monitoring is met or not if the Diesel Particulate Filter (DPF) of the vehicle enters the ignition stage of the parking regeneration process;
the control module is used for controlling to enter an SCR system conversion rate monitoring stage in the parking regeneration process if the SCR system conversion rate monitoring initial condition is determined to be met, controlling the upstream temperature of the DPF to be maintained in a preset temperature interval after the SCR system conversion rate monitoring stage is entered, and maintaining the upstream temperature of the SCR system in an optimal efficiency monitoring temperature interval when the upstream temperature of the DPF is maintained in the preset temperature interval;
the judging module is also used for judging whether the SCR system conversion rate monitoring release condition is met;
the monitoring module is used for monitoring the quality of the nitric oxide on the upstream and the downstream of the SCR system to obtain a monitoring result if the conversion rate monitoring release condition of the SCR system is met;
and the calculation module is used for calculating the conversion rate of the SCR system according to the monitoring result.
8. The apparatus of claim 7, wherein the determining module, when determining whether the SCR system conversion monitoring initial condition is satisfied, is specifically configured to:
judging whether the upstream temperature of the DPF is greater than or equal to a second preset temperature threshold value, wherein the second preset temperature threshold value is smaller than the first preset temperature threshold value; if the upstream temperature of the DPF is determined to be greater than or equal to the second preset temperature threshold, judging whether a SCR system conversion rate monitoring request is monitored; if the SCR system conversion rate monitoring request is determined to be monitored, determining that the SCR system conversion rate monitoring initial condition is met; and if the SCR system conversion rate monitoring request is determined not to be monitored, determining that the SCR system conversion rate monitoring initial condition is not met.
9. An SCR system conversion monitoring device, comprising:
a memory, a processor, and a computer program;
wherein the computer program is stored in the memory and configured to be executed by the processor to implement the SCR system conversion monitoring method of any one of claims 1-6.
10. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program is executed by a processor to implement the SCR system conversion monitoring method as defined in any one of claims 1-6.
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