CN114607490A - Engine mode adjusting method and device, electronic equipment and storage medium - Google Patents

Engine mode adjusting method and device, electronic equipment and storage medium Download PDF

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Publication number
CN114607490A
CN114607490A CN202210267979.3A CN202210267979A CN114607490A CN 114607490 A CN114607490 A CN 114607490A CN 202210267979 A CN202210267979 A CN 202210267979A CN 114607490 A CN114607490 A CN 114607490A
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temperature
engine
scr
mode
upstream
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CN114607490B (en
Inventor
周海磊
张晨
陈彦波
栾军山
王新校
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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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • 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

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

Abstract

The application relates to the technical field of vehicle control, and discloses an engine mode adjusting method, an engine mode adjusting device, electronic equipment and a storage medium, wherein the method comprises the following steps: determining an SCR upstream temperature when an operating mode of the engine is a non-heating mode; if the SCR upstream temperature is higher than a first temperature threshold and lower than a second temperature threshold, determining the current SCR upstream temperature change rate and the DOC upstream temperature; the first temperature threshold is a temperature at which the conversion efficiency of the SCR is affected; and determining whether the working mode of the engine is adjusted to a heating mode or not according to the comparison result of the SCR upstream temperature change rate and the preset change rate and the comparison result of the DOC upstream temperature and the preset temperature. When the conversion efficiency of the SCR is not influenced by the temperature upstream of the SCR but is not very high, the engine mode is timely and accurately adjusted according to the temperature change rate of the SCR upstream and the temperature upstream of the DOC.

Description

Engine mode adjusting method and device, electronic equipment and storage medium
Technical Field
The present disclosure relates to the field of vehicle control technologies, and in particular, to an engine mode adjustment method, an engine mode adjustment device, an electronic device, and a storage medium.
Background
The engine mode refers to that the engine operates according to a preset program control under certain specific scenes. The heating mode of the engine is to meet the exhaust temperature requirement of the engine after-treatment, the engine is operated in a high exhaust temperature state by adjusting a throttle valve, and the conversion efficiency of Selective Catalytic Reduction (SCR) in the after-treatment is improved after the temperature is increased, so as to reduce nitrogen oxides (one of main emission pollutants of a diesel engine, mainly NO and NO)2Composition).
In the related art, by setting a temperature limit value, if the temperature of the SCR upstream is lower than the temperature limit value, the engine enters a heating mode; the SCR upstream temperature is above the temperature limit and the heating mode is exited.
However, there is hysteresis in the temperature change at the SCR, and in some scenarios, if the engine reenters the heating mode after the SCR upstream temperature is below the temperature limit, the SCR will be at a lower temperature for a longer period of time, which affects the SCR conversion efficiency.
Disclosure of Invention
The application provides an engine mode adjusting method and device, electronic equipment and a storage medium, which are used for adjusting an engine mode timely and accurately.
In a first aspect, an embodiment of the present application provides an engine mode adjustment method, including:
determining an SCR upstream temperature when an operating mode of the engine is a non-heating mode;
if the SCR upstream temperature is higher than a first temperature threshold and lower than a second temperature threshold, determining the current SCR upstream temperature change rate and the DOC (Catalyst Oxidation Catalyst) upstream temperature; the first temperature threshold is a temperature at which the conversion efficiency of the SCR is affected;
and determining whether the working mode of the engine is adjusted to a heating mode or not according to the comparison result of the SCR upstream temperature change rate and the preset change rate and the comparison result of the DOC upstream temperature and the preset temperature.
According to the scheme, when the working mode of the engine is a non-heating mode, if the temperature of the SCR upstream is higher than the temperature representing that the conversion efficiency of the SCR is affected, the non-heating mode is not directly maintained, but whether the temperature of the SCR upstream is lower than a second temperature threshold is determined, if the temperature of the SCR upstream is lower than the second temperature threshold, the SCR upstream temperature is not high although the conversion efficiency of the SCR is not affected, and whether the working mode of the engine is adjusted to be the heating mode is determined according to the SCR upstream temperature change rate (SCR upstream temperature change condition) and the DOC upstream temperature (effect condition on the SCR upstream temperature), so that the working mode of the engine is adjusted more timely and accurately.
In some optional embodiments, the method further comprises:
and if the SCR upstream temperature is not higher than the first temperature threshold value, adjusting the working mode of the engine to a heating mode.
According to the scheme, when the temperature of the SCR upstream is not higher than the temperature which represents that the conversion efficiency of the SCR is affected, the working mode of the engine is adjusted to be the heating mode, so that the temperature inside the SCR is raised in time, and the influence on the conversion efficiency of the SCR is reduced.
In some optional embodiments, the preset rate of change includes a first preset rate of change and a second preset rate of change, and the second preset rate of change is smaller than the first preset rate of change; the preset temperature comprises a first preset temperature and a second preset temperature, and the first preset temperature is less than the second preset temperature; determining whether the working mode of the engine is adjusted to a heating mode according to the comparison result of the SCR upstream temperature change rate and the preset change rate and the comparison result of the DOC upstream temperature and the preset temperature, wherein the determining step comprises the following steps:
if the SCR upstream temperature change rate is lower than the first preset change rate and the DOC upstream temperature is lower than the first preset temperature, determining that the working mode of the engine is adjusted to a heating mode; or
And if the SCR upstream temperature change rate is lower than the second preset change rate and the DOC upstream temperature is lower than the second preset temperature, determining that the working mode of the engine is adjusted to a heating mode.
According to the scheme, if the SCR upstream temperature change rate is lower than a first preset change rate, the SCR upstream temperature change condition is poor, the SCR upstream temperature change influence is small, and the DOC upstream temperature is lower than the first preset temperature, the DOC upstream temperature can obviously influence the internal temperature reduction of the subsequent SCR, and at the moment, the working mode of the engine needs to be adjusted to be a heating mode; if the SCR upstream temperature change rate is lower than the second preset change rate, the SCR upstream temperature change condition is worse, the SCR upstream temperature change influence is larger, the DOC upstream temperature is lower than the second preset temperature, the DOC upstream temperature has no obvious influence on the SCR internal temperature, and at the moment, the working mode of the engine also needs to be adjusted to a heating mode, so that the engine mode can be flexibly and timely adjusted in different scenes.
In some optional embodiments, if it is determined that the operation mode of the engine is adjusted to the heating mode, before adjusting the operation mode of the engine to the heating mode, the method further includes:
and determining that the engine works under the preset working condition within the preset time.
According to the scheme, when the temperature of the SCR upstream is not very high, the engine is firstly determined to work under the preset working condition within the preset time, so that the current working condition of the engine is stable when the working mode of the engine is adjusted to the heating mode.
In some optional embodiments, the preset rate of change is less than 0, and the preset temperature is lower than the second temperature threshold.
In some optional embodiments, if it is determined that the operation mode of the engine is adjusted to the heating mode, after the operation mode of the engine is adjusted to the heating mode, the method further includes:
adjusting the operating mode of the engine to a non-heating mode if the temperature upstream of the DOC is higher than the first temperature threshold value, and a first weighted temperature of a Diesel Particulate Filter (DPF) upstream temperature and a SCR upstream temperature determined based on a first weighting coefficient is higher than the first temperature threshold value; or
And if the SCR downstream temperature is higher than the first temperature threshold value, and the second weighted temperature of the DPF upstream temperature and the SCR upstream temperature determined based on the second weighting coefficient is higher than the first temperature threshold value, adjusting the working mode of the engine to be a non-heating mode.
According to the scheme, if the temperature upstream of the DOC is higher than the first temperature threshold value, the temperature of the part close to the engine in the aftertreatment is higher; the first weighted temperature is higher than a first temperature threshold value, which indicates that the overall temperature of the post-processing is higher, and the working mode of the engine can be adjusted to be a non-heating mode; if the temperature downstream of the SCR is higher than the first temperature threshold, the temperature of the part far away from the engine in the aftertreatment is higher; and the second weighted temperature is higher than the first temperature threshold, which indicates that the overall aftertreatment temperature is higher, and the operating mode of the engine can be adjusted to be the non-heating mode. Therefore, the heating mode can be timely and accurately quitted in different scenes, and the power consumption is saved.
In a second aspect, an embodiment of the present application provides an engine mode adjustment apparatus, including:
the temperature determination module is used for determining the temperature of the SCR upstream when the working mode of the engine is a non-heating mode;
the temperature determination module is further used for determining the current SCR upstream temperature change rate and the DOC upstream temperature if the SCR upstream temperature is higher than a first temperature threshold and lower than a second temperature threshold; the first temperature threshold is a temperature at which the conversion efficiency of the SCR is affected;
and the mode adjusting module is used for determining whether the working mode of the engine is adjusted to a heating mode or not according to the comparison result of the SCR upstream temperature change rate and the preset change rate and the comparison result of the DOC upstream temperature and the preset temperature.
In some optional embodiments, the mode adjustment module is further configured to:
and if the SCR upstream temperature is not higher than the first temperature threshold value, adjusting the working mode of the engine to a heating mode.
In some optional embodiments, the preset rate of change includes a first preset rate of change and a second preset rate of change, and the second preset rate of change is less than the first preset rate of change; the preset temperature comprises a first preset temperature and a second preset temperature, and the first preset temperature is less than the second preset temperature; the mode adjustment module is specifically configured to:
if the SCR upstream temperature change rate is lower than the first preset change rate and the DOC upstream temperature is lower than the first preset temperature, determining that the working mode of the engine is adjusted to a heating mode; or
And if the SCR upstream temperature change rate is lower than the second preset change rate and the DOC upstream temperature is lower than the second preset temperature, determining that the working mode of the engine is adjusted to a heating mode.
In some optional embodiments, if it is determined to adjust the operating mode of the engine to a heating mode, the mode adjustment module is further configured to, prior to adjusting the operating mode of the engine to a heating mode:
and determining that the engine works under the preset working condition within the preset time.
In some optional embodiments, the preset rate of change is less than 0, and the preset temperature is lower than the second temperature threshold.
In some optional embodiments, if it is determined to adjust the operating mode of the engine to a heating mode, the mode adjustment module, after adjusting the operating mode of the engine to a heating mode, is further configured to:
if the DOC upstream temperature is higher than the first temperature threshold value, and the first weighted temperature of the DPF upstream temperature and the SCR upstream temperature determined based on the first weighting coefficient is higher than the first temperature threshold value, adjusting the working mode of the engine to be a non-heating mode; or
And if the SCR downstream temperature is higher than the first temperature threshold value, and the second weighted temperature of the DPF upstream temperature and the SCR upstream temperature determined based on the second weighting coefficient is higher than the first temperature threshold value, adjusting the working mode of the engine to be a non-heating mode.
In a third aspect, an embodiment of the present application provides an electronic device, including a processor and a memory;
wherein the memory stores program code which, when executed by the processor, causes the processor to carry out the engine mode adjustment method of any one of the first aspects.
In a fourth aspect, the present application provides a computer-readable storage medium, in which a computer program is stored, and when the computer program is executed by a processor, the method for adjusting the engine mode according to any one of the first aspect is implemented.
In addition, for technical effects brought by any one implementation manner of the second aspect to the fourth aspect, reference may be made to technical effects brought by different implementation manners of the first aspect, and details are not described here.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic diagram of a post-processing structure provided in an embodiment of the present application;
FIG. 2 is a schematic diagram illustrating a variation of post-treatment temperature provided by an embodiment of the present application;
FIG. 3 is a schematic flow chart diagram illustrating a first method of engine mode adjustment provided in accordance with an embodiment of the present application;
FIG. 4 is a schematic flow chart diagram illustrating a second method of engine mode adjustment provided in accordance with an embodiment of the present application;
FIG. 5 is a schematic flow chart diagram illustrating a third method of engine mode adjustment provided in accordance with an embodiment of the present application;
FIG. 6 is a schematic flow chart diagram illustrating a fourth method of engine mode adjustment provided in accordance with an embodiment of the present application;
FIG. 7 is a schematic structural diagram of an engine mode adjustment apparatus according to an embodiment of the present disclosure;
fig. 8 is a schematic block diagram of an electronic device provided in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, unless otherwise expressly specified or limited, the term "coupled" is to be construed broadly, e.g., as meaning directly coupled to or indirectly coupled through intervening elements, or as meaning communicating between two devices. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The engine mode refers to that the engine operates according to a preset program control under certain specific scenes. The heating mode of the engine is to meet the requirement of exhaust temperature for the engine aftertreatment, and the engine is operated in a high exhaust temperature state by adjusting a throttle valve, so that the conversion efficiency of SCR in the aftertreatment is improved after the temperature is increased, and nitrogen oxides discharged by the engine are reduced. The SCR can inject urea according to the amount of nitrogen oxides discharged from the engine, and the urea injected at temperatures lower than the conversion temperature (e.g., 180 ℃) cannot be hydrolyzed or further chemically reacted with nitrogen oxides.
Referring to the schematic diagram of the aftertreatment structure shown in fig. 1, the aftertreatment includes DOC, DPF and SCR; wherein the DPF is positioned downstream of the DOC and upstream of the SCR.
In the related art, by setting a temperature limit value, if the temperature of the SCR upstream is lower than the temperature limit value, the engine enters a heating mode; the SCR upstream temperature is above the temperature limit and the heating mode is exited.
Referring to FIG. 2, the SCR upstream temperature is below the temperature limit T0When the temperature of the engine is higher than the set temperature, the engine enters a heating mode (point A in the figure), then the temperatures of the DOC, the DPF and the SCR sequentially rise (the temperature change rule of the DOC upstream is closest to the engine, and the temperature change rule of the DOC upstream can reflect the change of the exhaust temperature of the engine most), and after a long time, the temperature of the SCR upstream rises to T0(point B in the figure). Thus, there is a hysteresis in the temperature change at the SCR, and in some scenarios, if the engine reenters the heating mode after the SCR upstream temperature is below the temperature limit, the SCR will be at a lower temperature for a longer period of time, which affects the SCR conversion efficiency.
Based on this, the embodiment of the application provides an engine mode adjustment method, an engine mode adjustment device, an electronic device and a storage medium, wherein the method comprises the following steps: determining an SCR upstream temperature when an operating mode of the engine is a non-heating mode; if the SCR upstream temperature is higher than a first temperature threshold and lower than a second temperature threshold, determining the current SCR upstream temperature change rate and the DOC upstream temperature; the first temperature threshold is a temperature at which the conversion efficiency of the SCR is affected; and determining whether the working mode of the engine is adjusted to a heating mode or not according to the comparison result of the SCR upstream temperature change rate and the preset change rate and the comparison result of the DOC upstream temperature and the preset temperature.
According to the scheme, when the working mode of the engine is a non-heating mode, if the temperature of the SCR upstream is higher than the temperature representing that the conversion efficiency of the SCR is affected, the non-heating mode is not directly maintained, but whether the temperature of the SCR upstream is lower than a second temperature threshold is determined, if the temperature of the SCR upstream is lower than the second temperature threshold, the SCR upstream temperature is not high although the conversion efficiency of the SCR is not affected, and whether the working mode of the engine is adjusted to be the heating mode is determined according to the SCR upstream temperature change rate (SCR upstream temperature change condition) and the DOC upstream temperature (effect condition on the SCR upstream temperature), so that the working mode of the engine is adjusted more timely and accurately.
The following describes the technical solutions of the present application and how to solve the above technical problems in detail with reference to the accompanying drawings and specific embodiments. These several specific embodiments may be combined with each other below, and details of the same or similar concepts or processes may not be repeated in some embodiments.
The embodiment of the application provides a first engine mode adjustment method, as shown in fig. 3, the method may include:
step S301: when the operating mode of the engine is a non-heating mode, a temperature upstream of the SCR is determined.
In this embodiment, the SCR upstream is the SCR intake side (the side near the DPF).
The non-heating mode is a throttle valve fully open mode, and the engine is operated at a low exhaust temperature. Such as normal mode, plateau mode, etc.
Step S302: if the SCR upstream temperature is higher than a first temperature threshold and lower than a second temperature threshold, determining the current SCR upstream temperature change rate and the DOC upstream temperature; the first temperature threshold is a temperature at which conversion efficiency of the SCR is affected.
The first temperature threshold is a temperature (such as 250 ℃) which indicates that the conversion efficiency of the SCR is affected, namely when the temperature of the SCR upstream is higher than the first temperature threshold, the conversion efficiency of the SCR is higher; when the temperature upstream of the SCR is not greater than the first temperature threshold, the conversion efficiency of the SCR decreases.
The second temperature threshold is higher than the first temperature threshold, and a specific value of the second temperature threshold may be set according to an actual application scenario (e.g., 300 ℃), which is not limited in this embodiment.
In this embodiment, the DOC upstream is the DOC intake side (the side closer to the engine).
The current SCR upstream temperature change rate is the change rate of the current SCR upstream temperature compared with the SCR upstream temperature at the historical moment; the historical time is a time which is before the current time and is a preset interval away from the current time.
Step S303: and determining whether the working mode of the engine is adjusted to a heating mode or not according to the comparison result of the SCR upstream temperature change rate and the preset change rate and the comparison result of the DOC upstream temperature and the preset temperature.
In this embodiment, the SCR upstream temperature change condition can be determined by comparing the SCR upstream temperature change rate with a preset change rate; through comparing DOC upstream temperature with preset temperature, can confirm the influence condition to SCR upstream temperature. Therefore, in the case that the SCR upstream temperature does not affect the conversion efficiency of the SCR, but is not very high, it can be determined whether to adjust the operation mode of the engine to the heating mode according to the above two comparison results.
The heating mode is to operate the engine in a high exhaust temperature state by adjusting a throttle valve (the throttle valve performs a choke operation).
According to the scheme, when the working mode of the engine is a non-heating mode, if the temperature of the SCR upstream is higher than the temperature representing that the conversion efficiency of the SCR is affected, the non-heating mode is not directly maintained, but whether the temperature of the SCR upstream is lower than a second temperature threshold is determined, if the temperature of the SCR upstream is lower than the second temperature threshold, the SCR upstream temperature is not high although the conversion efficiency of the SCR is not affected, and whether the working mode of the engine is adjusted to be the heating mode is determined according to the SCR upstream temperature change rate (SCR upstream temperature change condition) and the DOC upstream temperature (effect condition on the SCR upstream temperature), so that the working mode of the engine is adjusted more timely and accurately.
In some optional embodiments, the preset rate of change includes a first preset rate of change and a second preset rate of change, and the second preset rate of change is smaller than the first preset rate of change; the preset temperature comprises a first preset temperature and a second preset temperature, and the first preset temperature is less than the second preset temperature;
the step S303 can be implemented as follows:
if the SCR upstream temperature change rate is lower than the first preset change rate and the DOC upstream temperature is lower than the first preset temperature, determining that the working mode of the engine is adjusted to a heating mode; or alternatively
And if the SCR upstream temperature change rate is lower than the second preset change rate and the DOC upstream temperature is lower than the second preset temperature, determining that the working mode of the engine is adjusted to a heating mode.
As described above, the SCR upstream temperature change condition can be determined by comparing the SCR upstream temperature change rate with the preset change rate; if the SCR upstream temperature change rate is lower than a first preset change rate, the SCR upstream temperature change condition is poor (for example, the temperature drops faster), and if the SCR upstream temperature change rate is lower than a second preset change rate, the SCR upstream temperature change condition is worse (for example, the temperature drops faster);
the DOC upstream temperature is compared with the preset temperature, so that the influence condition on the SCR upstream temperature can be determined; if the upstream temperature of the DOC is lower than the second preset temperature, the internal temperature of the subsequent SCR is influenced to be reduced, and if the upstream temperature of the DOC is lower than the first preset temperature, the internal temperature of the subsequent SCR is influenced to be reduced more obviously;
in summary, the SCR upstream temperature change rate is lower than a first preset change rate (SCR upstream temperature change has a small influence), but the DOC upstream temperature is lower than the first preset temperature (DOC upstream temperature influence is large); or, if the SCR upstream temperature change rate is lower than a second preset change rate (the SCR upstream temperature change has a large influence), but the DOC upstream temperature is lower than the second preset temperature (the DOC upstream temperature has a small influence), the operation mode of the engine is adjusted to the heating mode.
According to the scheme, if the SCR upstream temperature change rate is lower than a first preset change rate, the SCR upstream temperature change condition is poor, the SCR upstream temperature change influence is small, and the DOC upstream temperature is lower than the first preset temperature, the DOC upstream temperature can obviously influence the internal temperature reduction of the subsequent SCR, and at the moment, the working mode of the engine needs to be adjusted to be a heating mode; if the SCR upstream temperature change rate is lower than the second preset change rate, the SCR upstream temperature change condition is worse, the SCR upstream temperature change influence is larger, the DOC upstream temperature is lower than the second preset temperature, the DOC upstream temperature has no obvious influence on the SCR internal temperature, and at the moment, the working mode of the engine also needs to be adjusted to a heating mode, so that the engine mode can be flexibly and timely adjusted in different scenes.
In some optional embodiments, the preset rate of change is less than 0, and the preset temperature is lower than the second temperature threshold.
In practice, if the SCR upstream temperature change rate is lower than 0, indicating that the SCR upstream temperature has started to decrease, based on which the above-mentioned preset change rate may be set to be less than 0;
in addition, when the temperature upstream of the DOC is lower than the second temperature threshold, the DOC internal temperature is relatively low, and based on this, the preset temperature may be set to be lower than the second temperature threshold.
The embodiment of the present application provides a second engine mode adjustment method, which may include, as shown in fig. 4:
step S401: when the operating mode of the engine is a non-heating mode, a temperature upstream of the SCR is determined.
Step S402: if the SCR upstream temperature is higher than a first temperature threshold and lower than a second temperature threshold, determining the current SCR upstream temperature change rate and the DOC upstream temperature; the first temperature threshold is a temperature at which conversion efficiency of the SCR is affected.
Step S403: and determining whether the working mode of the engine is adjusted to a heating mode or not according to the comparison result of the SCR upstream temperature change rate and the preset change rate and the comparison result of the DOC upstream temperature and the preset temperature.
The specific implementation manner of steps S401 to S403 may refer to the above embodiments, and will not be described herein.
Step S404: and if the SCR upstream temperature is not higher than the first temperature threshold value, adjusting the working mode of the engine to a heating mode.
As mentioned above, the first temperature threshold is a temperature that indicates that the conversion efficiency of the SCR is affected, that is, when the temperature upstream of the SCR is higher than the first temperature threshold, the conversion efficiency of the SCR is higher; when the temperature upstream of the SCR is not greater than the first temperature threshold, the conversion efficiency of the SCR decreases.
In this embodiment, if the SCR upstream temperature is not higher than the first temperature threshold, which indicates that the conversion efficiency of the SCR has decreased at this time, the SCR internal temperature needs to be immediately increased, and therefore, if the SCR upstream temperature is not higher than the first temperature threshold, the operation mode of the engine needs to be adjusted to the heating mode.
It is understood that there is no necessary logical association between the above steps S402 to S403 and step S404, and steps S402 to S403 are executed when the SCR upstream temperature is higher than the first temperature threshold and lower than the second temperature threshold; step S404 is performed when the SCR upstream temperature is not higher than the first temperature threshold.
According to the scheme, when the temperature of the SCR upstream is not higher than the temperature which represents that the conversion efficiency of the SCR is affected, the working mode of the engine is adjusted to be the heating mode, so that the temperature inside the SCR is raised in time, and the influence on the conversion efficiency of the SCR is reduced.
The present embodiment provides a third engine mode adjustment method, which may include, as shown in fig. 5:
step S501: the SCR upstream temperature is determined when the operating mode of the engine is a non-heating mode.
Step S502: if the SCR upstream temperature is higher than a first temperature threshold and lower than a second temperature threshold, determining the current SCR upstream temperature change rate and the DOC upstream temperature; the first temperature threshold is a temperature at which conversion efficiency of the SCR is affected.
Step S503: and determining whether the working mode of the engine is adjusted to a heating mode or not according to the comparison result of the SCR upstream temperature change rate and the preset change rate and the comparison result of the DOC upstream temperature and the preset temperature.
The specific implementation manner of steps S501 to S503 can refer to the above embodiments, and is not described herein again.
Step S504: if the working mode of the engine is determined to be adjusted to the heating mode, before the working mode of the engine is adjusted to the heating mode, the engine is determined to work under the preset working condition within the preset time.
When the temperature upstream of the SCR is not very high, the working mode of the engine is adjusted to a heating mode, and the working condition of the engine needs to be determined firstly.
And if the engine works under the preset working condition within the preset time, the current working condition of the engine is stable. The embodiment does not specifically limit the preset working conditions, such as low-load working conditions; the preset duration is not limited in this embodiment, for example, 2 s.
According to the scheme, when the temperature of the SCR upstream is not very high, the engine is firstly determined to work under the preset working condition within the preset time, so that the current working condition of the engine is stable when the working mode of the engine is adjusted to the heating mode.
The present embodiment provides a fourth engine mode adjustment method, which may include, as shown in fig. 6:
step S601: when the operating mode of the engine is a non-heating mode, a temperature upstream of the SCR is determined.
Step S602: if the SCR upstream temperature is higher than a first temperature threshold and lower than a second temperature threshold, determining the current SCR upstream temperature change rate and the DOC upstream temperature; the first temperature threshold is a temperature at which conversion efficiency of the SCR is affected.
Step S603: and determining whether the working mode of the engine is adjusted to a heating mode or not according to the comparison result of the SCR upstream temperature change rate and the preset change rate and the comparison result of the DOC upstream temperature and the preset temperature.
The specific implementation manner of steps S601 to S603 may refer to the above embodiments, and will not be described herein again.
Step S604: if the operation mode of the engine is adjusted to a heating mode, after the operation mode of the engine is adjusted to the heating mode, if the DOC upstream temperature is higher than the first temperature threshold value, and the first weighted temperature of the DPF upstream temperature and the SCR upstream temperature determined based on the first weighting coefficient is higher than the first temperature threshold value, the operation mode of the engine is adjusted to a non-heating mode; or if the SCR downstream temperature is higher than the first temperature threshold value, and a second weighted temperature of the DPF upstream temperature and the SCR upstream temperature determined based on a second weighting coefficient is higher than the first temperature threshold value, adjusting the working mode of the engine to be a non-heating mode.
In this embodiment, after the operation mode of the engine is adjusted to the heating mode, it is also necessary to determine in real time whether the heating mode needs to be exited.
If the temperature upstream of the DOC is higher than the first temperature threshold, the temperature of the part close to the engine in the aftertreatment is higher; the first weighted temperature is higher than a first temperature threshold value, which indicates that the overall temperature of the post-processing is higher, and the working mode of the engine can be adjusted to be a non-heating mode;
if the temperature downstream of the SCR is higher than the first temperature threshold, the temperature of the part far away from the engine in the aftertreatment is higher; and the second weighted temperature is higher than the first temperature threshold, which indicates that the overall aftertreatment temperature is higher, and the operating mode of the engine can be adjusted to be the non-heating mode.
Illustratively, the first weighted temperature is a1 × T1+ a2 × T2, where a1 is a coefficient corresponding to the DPF upstream temperature in the first weighting coefficient, and a2 is a coefficient corresponding to the SCR upstream temperature in the first weighting coefficient;
and a second weighted temperature B1T 1+ B2T 2, wherein B1 is a coefficient corresponding to the DPF upstream temperature in the second weighting coefficient, and B2 is a coefficient corresponding to the SCR upstream temperature in the second weighting coefficient.
According to the scheme, if the temperature upstream of the DOC is higher than the first temperature threshold value, the temperature of the part close to the engine in the aftertreatment is higher; the first weighted temperature is higher than a first temperature threshold value, which indicates that the overall temperature of the post-processing is higher, and the working mode of the engine can be adjusted to be a non-heating mode; if the temperature downstream of the SCR is higher than the first temperature threshold, the temperature of the part far away from the engine in the aftertreatment is higher; and the second weighted temperature is higher than the first temperature threshold, which indicates that the overall aftertreatment temperature is higher, and the operating mode of the engine can be adjusted to be the non-heating mode. Therefore, the heating mode can be timely and accurately quitted in different scenes, and the power consumption is saved.
As shown in fig. 7, based on the same inventive concept, an embodiment of the present application provides an engine mode adjustment apparatus 700, including:
a temperature determination module 701 for determining an SCR upstream temperature when an operating mode of an engine is a non-heating mode;
the temperature determining module 701 is further configured to determine a current SCR upstream temperature change rate and a DOC upstream temperature if the SCR upstream temperature is higher than a first temperature threshold and lower than a second temperature threshold; the first temperature threshold is a temperature at which the conversion efficiency of the SCR is affected;
a mode adjusting module 702, configured to determine whether to adjust the operating mode of the engine to a heating mode according to a comparison result between the SCR upstream temperature change rate and a preset change rate and a comparison result between the DOC upstream temperature and a preset temperature.
In some optional embodiments, the mode adjustment module 702 is further configured to:
and if the SCR upstream temperature is not higher than the first temperature threshold value, adjusting the working mode of the engine to a heating mode.
In some optional embodiments, the preset rate of change includes a first preset rate of change and a second preset rate of change, and the second preset rate of change is less than the first preset rate of change; the preset temperature comprises a first preset temperature and a second preset temperature, and the first preset temperature is less than the second preset temperature; the mode adjustment module 702 is specifically configured to:
if the SCR upstream temperature change rate is lower than the first preset change rate and the DOC upstream temperature is lower than the first preset temperature, determining to adjust the working mode of the engine to a heating mode; or
And if the SCR upstream temperature change rate is lower than the second preset change rate and the DOC upstream temperature is lower than the second preset temperature, determining that the working mode of the engine is adjusted to a heating mode.
In some optional embodiments, if it is determined to adjust the operating mode of the engine to the heating mode, the mode adjustment module 702 is further configured to, prior to adjusting the operating mode of the engine to the heating mode:
and determining that the engine works under the preset working condition within the preset time.
In some optional embodiments, the preset rate of change is less than 0, and the preset temperature is lower than the second temperature threshold.
In some optional embodiments, if it is determined to adjust the operating mode of the engine to the heating mode, the mode adjustment module 702 is further configured to, after adjusting the operating mode of the engine to the heating mode:
if the DOC upstream temperature is higher than the first temperature threshold value, and the first weighted temperature of the DPF upstream temperature and the SCR upstream temperature determined based on the first weighting coefficient is higher than the first temperature threshold value, adjusting the working mode of the engine to be a non-heating mode; or
And if the SCR downstream temperature is higher than the first temperature threshold value, and the second weighted temperature of the DPF upstream temperature and the SCR upstream temperature determined based on the second weighting coefficient is higher than the first temperature threshold value, adjusting the working mode of the engine to be a non-heating mode.
Since the apparatus is the apparatus in the method in the embodiment of the present application, and the principle of the apparatus for solving the problem is similar to that of the method, the implementation of the apparatus may refer to the implementation of the method, and repeated details are not repeated.
As shown in fig. 8, based on the same inventive concept, an embodiment of the present application provides an electronic device 800, including: a processor 801 and a memory 802;
the memory 802 may be a volatile memory (volatile memory), such as a random-access memory (RAM); the memory 802 may also be a non-volatile memory (non-volatile memory), such as a read-only memory (rom), a flash memory (flash memory), a hard disk (HDD) or a solid-state drive (SSD); or memory 802 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory 802 may be a combination of the above.
The processor 801 may include one or more Central Processing Units (CPUs), Graphics Processing Units (GPUs), or digital Processing units (dsps), among others.
The specific connection medium between the memory 802 and the processor 801 is not limited in the embodiments of the present application. In the embodiment of the present application, the memory 802 and the processor 801 are connected by a bus 803 in fig. 8, the bus 803 is represented by a thick line in fig. 8, and the bus 803 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 8, but this is not intended to represent only one bus or type of bus.
Wherein the memory 802 stores program code which, when executed by the processor 801, causes the processor 801 to perform the following:
determining an SCR upstream temperature when an operating mode of the engine is a non-heating mode;
if the SCR upstream temperature is higher than a first temperature threshold and lower than a second temperature threshold, determining the current SCR upstream temperature change rate and the DOC upstream temperature; the first temperature threshold is a temperature at which the conversion efficiency of the SCR is affected;
and determining whether the working mode of the engine is adjusted to a heating mode or not according to the comparison result of the SCR upstream temperature change rate and the preset change rate and the comparison result of the DOC upstream temperature and the preset temperature.
In some optional embodiments, the processor 801 further performs:
and if the SCR upstream temperature is not higher than the first temperature threshold value, adjusting the working mode of the engine to a heating mode.
In some optional embodiments, the preset rate of change includes a first preset rate of change and a second preset rate of change, and the second preset rate of change is less than the first preset rate of change; the preset temperature comprises a first preset temperature and a second preset temperature, and the first preset temperature is less than the second preset temperature; the processor 801 specifically executes:
if the SCR upstream temperature change rate is lower than the first preset change rate and the DOC upstream temperature is lower than the first preset temperature, determining that the working mode of the engine is adjusted to a heating mode; or
And if the SCR upstream temperature change rate is lower than the second preset change rate and the DOC upstream temperature is lower than the second preset temperature, determining that the working mode of the engine is adjusted to a heating mode.
In some optional embodiments, if it is determined to adjust the operation mode of the engine to the heating mode, before adjusting the operation mode of the engine to the heating mode, the processor 801 further performs:
and determining that the engine works under the preset working condition within the preset time.
In some optional embodiments, the preset rate of change is less than 0, and the preset temperature is lower than the second temperature threshold.
In some optional embodiments, if it is determined to adjust the operation mode of the engine to the heating mode, after adjusting the operation mode of the engine to the heating mode, the processor 801 further performs:
if the DOC upstream temperature is higher than the first temperature threshold value, and the first weighted temperature of the DPF upstream temperature and the SCR upstream temperature determined based on the first weighting coefficient is higher than the first temperature threshold value, adjusting the working mode of the engine to be a non-heating mode; or alternatively
And if the SCR downstream temperature is higher than the first temperature threshold value, and the second weighted temperature of the DPF upstream temperature and the SCR upstream temperature determined based on the second weighting coefficient is higher than the first temperature threshold value, adjusting the working mode of the engine to be a non-heating mode.
Since the electronic device is an electronic device that executes the method in the embodiment of the present application, and the principle of solving the problem of the electronic device is similar to that of the method, the implementation of the electronic device may refer to the implementation of the method, and repeated parts are not described again.
Embodiments of the present application provide a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the engine mode adjustment method as described above. The readable storage medium may be a nonvolatile readable storage medium, among others.
The present application is described above with reference to block diagrams and/or flowchart illustrations of methods, apparatus (systems) and/or computer program products according to embodiments of the application. It will be understood that one block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, and/or other programmable apparatus to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable apparatus, create means for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.
Accordingly, the subject application may also be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.). Furthermore, the present application may take the form of a computer program product on a computer-usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system. In the context of this application, a computer-usable or computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (10)

1. An engine mode adjustment method, comprising:
determining the upstream temperature of the selective catalytic reduction SCR when the working mode of the engine is a non-heating mode;
if the SCR upstream temperature is higher than a first temperature threshold and lower than a second temperature threshold, determining the current SCR upstream temperature change rate and the oxidation catalytic converter (DOC) upstream temperature; the first temperature threshold is a temperature at which the conversion efficiency of the SCR is affected;
and determining whether the working mode of the engine is adjusted to a heating mode or not according to the comparison result of the SCR upstream temperature change rate and the preset change rate and the comparison result of the DOC upstream temperature and the preset temperature.
2. The method of claim 1, further comprising:
and if the SCR upstream temperature is not higher than the first temperature threshold value, adjusting the working mode of the engine to a heating mode.
3. The method of claim 1, wherein the predetermined rate of change comprises a first predetermined rate of change and a second predetermined rate of change, and wherein the second predetermined rate of change is less than the first predetermined rate of change; the preset temperature comprises a first preset temperature and a second preset temperature, and the first preset temperature is less than the second preset temperature; determining whether to adjust the working mode of the engine to a heating mode according to a comparison result of the SCR upstream temperature change rate and a preset change rate and a comparison result of the DOC upstream temperature and a preset temperature, wherein the comparison result comprises:
if the SCR upstream temperature change rate is lower than the first preset change rate and the DOC upstream temperature is lower than the first preset temperature, determining that the working mode of the engine is adjusted to a heating mode; or
And if the SCR upstream temperature change rate is lower than the second preset change rate and the DOC upstream temperature is lower than the second preset temperature, determining that the working mode of the engine is adjusted to a heating mode.
4. The method of claim 1, wherein if it is determined to adjust the operating mode of the engine to the heating mode, before adjusting the operating mode of the engine to the heating mode, further comprising:
and determining that the engine works under the preset working condition within the preset time.
5. The method of claim 1, wherein the preset rate of change is less than 0 and the preset temperature is below the second temperature threshold.
6. The method according to any one of claims 1 to 5, wherein if it is determined that the operation mode of the engine is adjusted to the heating mode, after the operation mode of the engine is adjusted to the heating mode, further comprising:
if the temperature upstream of the DOC is higher than the first temperature threshold value, and the first weighted temperature of the temperature upstream of the DPF and the temperature upstream of the SCR, which is determined based on the first weighting coefficient, is higher than the first temperature threshold value, the working mode of the engine is adjusted to be a non-heating mode; or
And if the SCR downstream temperature is higher than the first temperature threshold value, and the second weighted temperature of the DPF upstream temperature and the SCR upstream temperature determined based on the second weighting coefficient is higher than the first temperature threshold value, adjusting the working mode of the engine to be a non-heating mode.
7. An engine mode adjustment device, comprising:
the temperature determination module is used for determining the temperature of the SCR upstream when the working mode of the engine is a non-heating mode;
the temperature determination module is further used for determining the current SCR upstream temperature change rate and the DOC upstream temperature if the SCR upstream temperature is higher than a first temperature threshold and lower than a second temperature threshold; the first temperature threshold is a temperature at which the conversion efficiency of the SCR is affected;
and the mode adjusting module is used for determining whether the working mode of the engine is adjusted to a heating mode or not according to the comparison result of the SCR upstream temperature change rate and the preset change rate and the comparison result of the DOC upstream temperature and the preset temperature.
8. The apparatus of claim 7, wherein the mode adjustment module is further configured to:
if the SCR upstream temperature is not higher than the first temperature threshold, adjusting the operating mode of the engine to a heating mode.
9. An electronic device, comprising: a processor and a memory;
wherein the memory stores program code which, when executed by the processor, causes the processor to carry out the engine mode adjustment method of any one of claims 1 to 6.
10. A computer-readable storage medium, in which a computer program is stored which, when executed by a processor, implements an engine mode adjustment method according to any one of claims 1 to 6.
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