CN115405403B

CN115405403B - Temperature control method and device, electronic equipment and storage medium

Info

Publication number: CN115405403B
Application number: CN202211198624.XA
Authority: CN
Inventors: 李钊; 安宁; 秦海玉; 褚国良; 董辉
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2024-06-18
Anticipated expiration: 2042-09-29
Also published as: CN115405403A

Abstract

The application relates to the technical field of engines, in particular to a temperature control method, a temperature control device, electronic equipment and a storage medium, which are used for improving the thermal management efficiency of an engine and reducing the oil consumption. The method comprises the following steps: heating exhaust gas of an engine based on a current heating mode, and acquiring an SCR upstream temperature and an exhaust gas temperature index of a selective catalytic reduction reactor of the engine; and switching the current heating mode to the next heating mode to heat the exhaust gas after determining that the mode switching is required based on the SCR upstream temperature and the exhaust gas temperature index, wherein the mode switching conditions corresponding to different heating modes are different, and the fuel consumption of the different heating modes is different. According to the application, by monitoring the temperature of the upstream of the SCR and the exhaust temperature index, when the mode switching is determined to be needed, the heating mode switching is timely performed, so that the heat management efficiency of the engine can be improved and the fuel consumption can be reduced.

Description

Temperature control method and device, electronic equipment and storage medium

Technical Field

The present application relates to the field of engine technologies, and in particular, to a temperature control method, a temperature control device, an electronic device, and a storage medium.

Background

With the increasing awareness of society about ecological environment protection, the problem of ecological environment pollution caused by pollutants in motor vehicle exhaust is increasingly prominent. In order to meet the pollutant emission standards in motor vehicle exhaust gas, the exhaust gas is generally subjected to catalytic treatment by an after-treatment system of an engine before being discharged, so that the pollutant content in the exhaust gas is reduced. In performing catalytic processes, due to the different activities of the catalysts at different temperatures, for example, a Selective Catalytic Reduction (SCR) reactor (SELECTIVE CATALYST Reduction) is required to convert nitrogen oxides (NOx) and a diesel particulate filter (Diesel Particulate Filter, DPF) is required to capture the particulate matter in the exhaust gas. It is therefore necessary to raise the exhaust gas temperature before the catalytic treatment is performed so that the exhaust gas temperature reaches a set value to improve the catalytic efficiency.

In the related art, the exhaust throttle valve and the air inlet throttle valve are mainly adjusted to reduce the air quantity so as to control the exhaust temperature to reach the specified temperature (namely, the engine heat management), but the mode does not consider that the exhaust temperature changes quickly under the transient working condition, the time of throttle valve adjustment is difficult to accurately grasp, and the untimely adjustment of the throttle valve can lead to large fluctuation of the exhaust temperature, low engine heat management efficiency and high oil consumption.

Disclosure of Invention

The embodiment of the application provides a temperature control method, a temperature control device, electronic equipment and a storage medium, which are used for improving the heat management efficiency of an engine and reducing the fuel consumption.

The temperature control method provided by the embodiment of the application comprises the following steps:

Heating exhaust gas of an engine based on a current heating mode, and acquiring an upstream temperature and an exhaust gas temperature index of a Selective Catalytic Reduction (SCR) of the engine; wherein the exhaust gas temperature index comprises a gas temperature index and/or a water outlet temperature of the engine, and the gas temperature index comprises an oxidation catalytic converter DOC upstream temperature and/or a diesel particulate filter DPF upstream temperature of the engine;

based on the SCR upstream temperature and the exhaust gas temperature index, after determining that mode switching is required, switching the current heating mode to a next heating mode to heat the exhaust gas; wherein, the mode switching conditions corresponding to different heating modes are different, and the fuel consumption of different heating modes is different.

In the application, in the process of heating the exhaust gas of the engine, the heating mode is switched by detecting the SCR upstream temperature, DOC upstream temperature, DPF upstream temperature and water outlet temperature of the engine, and the change trend of the exhaust gas temperature is prejudged, when the exhaust gas temperature is higher, the current heating mode is switched to the heating mode with lower oil consumption in advance, so that the oil consumption is reduced, and when the exhaust gas temperature is higher, the current heating mode is switched to the heating mode with higher effect on the rising of the exhaust gas temperature in advance, thereby avoiding larger fluctuation of the exhaust gas temperature and improving the thermal management efficiency. By performing exhaust temperature control in this way, the thermal management efficiency of the engine can be effectively improved and the fuel consumption can be reduced.

In an alternative embodiment, after determining that a mode switch is required, the switching the current heating mode to a next heating mode to heat the exhaust gas based on the SCR upstream temperature and the exhaust gas temperature indicator includes:

Determining that mode switching is required when a first mode switching condition corresponding to the current heating mode is met based on the SCR upstream temperature and the exhaust temperature index, and switching the current heating mode to a heating mode positioned behind the current heating mode in a mode sequence, wherein the first mode switching condition represents that the change trend of the SCR upstream temperature is an ascending trend;

And determining that mode switching is required when a second mode switching condition corresponding to the current heating mode is met based on the SCR upstream temperature and the exhaust temperature index, and switching the current heating mode to a heating mode before the current heating mode in the mode sequence, wherein the second mode switching condition represents that the change trend of the SCR upstream temperature is a descending trend.

Based on the above mode, when the condition that the temperature of the upstream of the SCR and the temperature index of the exhaust gas meet the first mode switching condition corresponding to the current heating mode is monitored, the current heating mode can be switched to the heating mode with lower fuel consumption, the fuel consumption in the process of heating the exhaust gas of the engine is reduced, when the condition that the temperature of the upstream of the SCR and the temperature index of the exhaust gas meet the second mode switching condition corresponding to the current heating mode is monitored, the current heating mode can be switched to the heating mode with higher effect on the rising of the temperature of the exhaust gas, the exhaust gas temperature of the engine is timely improved, the fluctuation of the exhaust gas temperature is avoided to be larger, and the thermal management efficiency is improved. By performing exhaust temperature control based on the above manner, fuel consumption can be reduced while improving thermal management efficiency of the engine.

In an alternative embodiment, if the exhaust gas temperature indicator includes the gas temperature indicator, the gas temperature indicator includes the DOC upstream temperature, the first mode switching condition is:

Within a preset duration, the temperature of the upstream of the SCR belongs to an ascending temperature interval corresponding to the current heating mode, the temperature of the upstream of the DOC is greater than or equal to a first ascending temperature threshold corresponding to the current heating mode, and the ascending rate of the temperature of the upstream of the DOC is greater than a first ascending rate threshold corresponding to the current heating mode;

the second mode switching condition is:

And within a preset duration, the temperature of the upstream of the SCR belongs to a falling temperature interval corresponding to the current heating mode, the temperature of the upstream of the DOC is smaller than or equal to a first falling temperature threshold corresponding to the current heating mode, and the falling rate of the temperature of the upstream of the DOC is larger than the first falling rate threshold corresponding to the current heating mode.

Based on the above mode, since the temperature change of the DOC upstream is faster than the temperature of the SCR upstream, when the temperature of the SCR upstream is detected to be increased to the corresponding temperature-increasing interval, and based on the temperature of the DOC upstream and the increasing rate, the temperature of the SCR upstream is prejudged to be the increasing trend, the current heating mode can be switched to the heating mode with lower oil consumption, the oil consumption is reduced, when the temperature of the SCR upstream is detected to be reduced to the corresponding temperature-decreasing interval, and based on the temperature of the DOC upstream and the decreasing rate, the temperature of the SCR upstream is prejudged to be the decreasing trend, the current heating mode can be switched to the heating mode with higher effect on the increasing of the exhaust temperature, the exhaust temperature is increased, under the fine management of the heating mode, the post treatment is kept at the proper temperature, the temperature can be rapidly increased, and the oil consumption is lower while the thermal management requirement is met.

In an alternative embodiment, if the exhaust gas temperature indicator includes the gas temperature indicator, the gas temperature indicator includes the DPF upstream temperature, the first mode switching condition is:

within a preset duration, the temperature of the upstream of the SCR belongs to an ascending temperature interval corresponding to the current heating mode, the temperature of the upstream of the DPF is greater than or equal to a second ascending temperature threshold corresponding to the current heating mode, and the ascending rate of the temperature of the upstream of the DPF is greater than the second ascending rate threshold corresponding to the current heating mode;

the second mode switching condition is:

And within a preset duration, the temperature of the upstream of the SCR belongs to a falling temperature interval corresponding to the current heating mode, the temperature of the upstream of the DPF is smaller than or equal to a second falling temperature threshold corresponding to the current heating mode, and the falling rate of the temperature of the upstream of the DPF is larger than the second falling rate threshold corresponding to the current heating mode.

Based on the above mode, since the temperature change of the upstream of the DPF is faster than the temperature of the upstream of the SCR, when the temperature of the upstream of the SCR is detected to have risen to the corresponding temperature rising interval, and based on the temperature of the upstream of the DPF and the rising rate, the upstream of the SCR is predicted to be the rising trend, the current heating mode can be switched to the heating mode with lower fuel consumption, the fuel consumption is reduced, when the temperature of the upstream of the SCR is detected to have fallen to the corresponding temperature falling interval, and based on the temperature of the upstream of the DPF and the falling rate, the upstream of the SCR is predicted to be the falling trend, the current heating mode can be switched to the heating mode with higher effect on the rising of the exhaust temperature, the exhaust temperature is increased, and under the fine management of the heating mode, the aftertreatment is kept at the proper temperature, the temperature can be quickly raised, and the fuel consumption is lower while the thermal management requirement is satisfied.

In an alternative embodiment, if the exhaust gas temperature indicator includes the outlet water temperature, the first mode switching condition is:

the upstream temperature of the SCR is greater than a second temperature threshold corresponding to the current heating mode, and the outlet water temperature is greater than a first water temperature threshold corresponding to the current heating mode;

the second mode switching condition is:

The upstream temperature of the SCR is smaller than or equal to a second temperature threshold corresponding to the current heating mode, and the outlet water temperature is smaller than or equal to a first water temperature threshold corresponding to the current heating mode.

Based on the mode, the water outlet temperature is increased to serve as an index for prejudging the change trend of the temperature at the upstream of the SCR, the change trend of the temperature at the upstream of the SCR is judged more accurately, the post-treatment is kept at a proper temperature under the fine management of the heating mode, the temperature can be quickly raised, and the fuel consumption is low while the thermal management requirement is met.

In an alternative embodiment, the pattern order is determined based on the fuel consumption of the individual heating patterns from high to low.

In an alternative embodiment, the method further comprises:

pollutant absorption is performed on the exhaust gas based on an aftertreatment system of the engine, the aftertreatment system comprising the SCR and the DOC.

Based on the mode, pollutant absorption is carried out on the exhaust gas, so that the pollutant content in the exhaust gas can be effectively reduced.

The temperature control device provided by the embodiment of the application comprises:

The heating unit is used for heating the exhaust gas of the engine based on the current heating mode and acquiring the temperature of the upstream of the selective catalytic reduction reactor SCR of the engine and the temperature index of the exhaust gas; wherein the exhaust gas temperature index comprises a gas temperature index and/or a water outlet temperature of the engine, and the gas temperature index comprises an oxidation catalytic converter DOC upstream temperature and/or a diesel particulate filter DPF upstream temperature of the engine;

The switching unit is used for switching the current heating mode to the next heating mode to heat the exhaust after determining that the mode switching is required based on the SCR upstream temperature and the exhaust temperature index; wherein, the mode switching conditions corresponding to different heating modes are different, and the fuel consumption of different heating modes is different.

Optionally, the switching unit is specifically configured to:

Optionally, if the exhaust gas temperature indicator includes the gas temperature indicator, and the gas temperature indicator includes the DOC upstream temperature, the first mode switching condition is:

the second mode switching condition is:

Optionally, if the exhaust gas temperature indicator includes the gas temperature indicator, the gas temperature indicator includes the DPF upstream temperature, the first mode switching condition is:

the second mode switching condition is:

Optionally, if the exhaust temperature indicator includes the outlet water temperature, the first mode switching condition is:

the second mode switching condition is:

Alternatively, the pattern order is determined based on the fuel consumption of the respective heating patterns from high to low.

Optionally, the apparatus further comprises a processing unit, configured to:

The electronic equipment provided by the embodiment of the application comprises a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor is caused to execute the steps of any one of the temperature control methods.

An embodiment of the present application provides a computer-readable storage medium including a computer program for causing an electronic device to execute the steps of any one of the above-described temperature control methods when the computer program is run on the electronic device.

Embodiments of the present application provide a computer program product comprising a computer program stored in a computer readable storage medium; when the processor of the electronic device reads the computer program from the computer-readable storage medium, the processor executes the computer program so that the electronic device performs the steps of any one of the temperature control methods described above.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

FIG. 1 is a schematic diagram of an engine according to an embodiment of the present disclosure;

FIG. 2 is a schematic flow chart of a temperature control method according to an embodiment of the present application;

FIG. 3 is a schematic overall flow chart of a temperature control method according to an embodiment of the application;

FIG. 4 is a schematic diagram of a temperature control device according to an embodiment of the present application;

Fig. 5 is a schematic diagram of a composition structure of an electronic device according to an embodiment of the present application;

Fig. 6 is a schematic diagram of a composition structure of another electronic device according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the technical solutions of the present application, but not all embodiments. All other embodiments, based on the embodiments described in the present document, which can be obtained by a person skilled in the art without any creative effort, are within the scope of protection of the technical solutions of the present application.

Some of the concepts involved in the embodiments of the present application are described below.

Engine thermal management: in order to enable the engine to quickly reach the optimal working temperature, particularly for a national six-diesel engine, when the engine is started in a cold state, the exhaust temperature is low, and the post-treatment temperature cannot reach the temperature required by the working in time, so that the post-treatment conversion efficiency is low, and therefore, the temperature of the exhaust gas needs to be increased through thermal management.

Post-processing system: the device is used for absorbing pollutants in the exhaust gas of the engine, so that the pollutants in the discharged exhaust gas can meet the national sixth emission standard. As shown in FIG. 1, the aftertreatment system mainly comprises a DOC, a particulate matter trap (Diesel Particulate Filter, DPF) and a post-SCR, and because the temperature change of the upstream of the DOC is the fastest and the temperature change of the upstream of the SCR is the slowest, the temperature of the upstream of the SCR is monitored, the temperature of the upstream of the DOC is additionally monitored, the change of the temperature of exhaust gas can be monitored more accurately, the heating mode can be switched in time, the heat management efficiency is improved, and the oil consumption is reduced.

DOC: for oxidizing part of the exhaust gas of the engine, e.g. NO to NO2, CO to CO2, CH to CO2 and water, while raising the temperature of the engine exhaust gas, assisting the proper operation of DPF and SCR.

DPF: the method is used for trapping the particulate matters in the tail gas, and when the trapped particulate matters reach a certain level, passive regeneration or active regeneration is required, so that the trapping capacity of the DPF on the particulate matters is recovered.

SCR: when the exhaust gas of the engine enters the SCR, NOx in the exhaust gas is removed by the reducing agent, and the reaction of the reducing agent with NOx is promoted by the SCR catalyst, while suppressing the non-selective oxidation reaction of the reducing agent with oxygen.

The following briefly describes the design concept of the embodiment of the present application:

with the increasing awareness of society about ecological environment protection, the problem of ecological environment pollution caused by pollutants in motor vehicle exhaust is increasingly prominent. After the official implementation of the national sixth emission regulations, a great part of pressure is applied to an after-treatment system of an engine, and the SCR catalyst is required to have proper temperature for converting NOx and regenerating DPF, so that how to control the exhaust temperature of the engine body is important.

In the related art, the exhaust throttle valve and the intake throttle valve are adjusted to reduce the air quantity so as to control the exhaust temperature to reach the specified temperature (i.e. engine thermal management), but the above-mentioned mode does not consider that the exhaust temperature changes quickly under the transient working condition, and the time of throttle valve adjustment is difficult to grasp accurately, and the untimely adjustment of the throttle valve can lead to the large fluctuation of the exhaust temperature, the engine thermal management efficiency is low, the oil consumption is high, so how to improve the engine thermal management efficiency and reduce the oil consumption is the problem to be solved urgently at present.

In view of this, the embodiment of the application provides an engine control method, an apparatus, an electronic device and a storage medium, because the application heats the exhaust gas of the engine based on the current heating mode and obtains the SCR upstream temperature and the exhaust gas temperature index of the engine, the exhaust gas temperature index includes the DOC upstream temperature and/or the effluent temperature, after determining that the mode switching is required, the current heating mode can be switched to the next heating mode in time to heat the exhaust gas, and because the mode switching conditions corresponding to different heating modes are different and the oil consumption of different heating modes is different, the exhaust gas temperature control is performed based on the mode, and the exhaust gas temperature control is performed better on the premise of ensuring the oil consumption, so that various catalysts in the aftertreatment system can better play a role.

The preferred embodiments of the present application will be described below with reference to the accompanying drawings of the specification, it being understood that the preferred embodiments described herein are for illustration and explanation only, and not for limitation of the present application, and embodiments of the present application and features of the embodiments may be combined with each other without conflict.

Referring to fig. 2, a flowchart of an implementation of a temperature control method according to an embodiment of the present application is shown, where the implementation of the method includes steps S21 to S22 as follows:

S21: heating exhaust gas of an engine based on a current heating mode, and acquiring an SCR upstream temperature and an exhaust gas temperature index of a selective catalytic reduction reactor of the engine;

the exhaust gas temperature index comprises a gas temperature index and/or an engine water outlet temperature, the gas temperature index comprises an oxidation catalytic converter DOC upstream temperature and/or a diesel particulate filter DPF upstream temperature of the engine, the SCR upstream temperature refers to a temperature before exhaust gas enters the SCR, the corresponding DOC upstream temperature refers to a temperature before the exhaust gas enters the DOC, and the DPF upstream temperature refers to a temperature before the exhaust gas enters the DPF. In different heating modes, the exhaust gas is heated mainly by means of actions of the air inlet valve and the air outlet valve with different degrees, engine oil post-injection and the like.

S22: and switching the current heating mode to the next heating mode to heat the exhaust after determining that the mode switching is required based on the SCR upstream temperature and the exhaust temperature index.

Wherein, the mode switching conditions corresponding to different heating modes are different, and the fuel consumption of different heating modes is different. In the process of heating the exhaust gas of the engine, different heating modes have different heating effects on the exhaust gas, the heating modes with higher heating effects on the exhaust gas temperature have higher oil consumption, different heating modes can be distinguished according to the difference of the oil consumption, and the heating modes can be switched after the mode switching is determined to be required, for example, the heating mode with higher oil consumption is switched to the heating mode with lower oil consumption, or the heating mode with lower heating effects on the exhaust gas temperature is switched to the heating mode with higher heating effects on the exhaust gas temperature. Thus, for different heating modes, the corresponding next heating mode is also different.

In an alternative embodiment, the pattern order is determined based on the fuel consumption of each heating pattern from high to low.

Specifically, in the present application, the following four modes are mainly described as the heating modes: the method comprises the steps of sorting the four heating modes from high fuel consumption to low fuel consumption according to a forced heating mode, a common heating mode, a heat preservation heating mode and a normal heating mode, wherein the mode sequence is as follows: forced heating mode, normal heating mode, thermal insulation heating mode, and normal heating mode.

The normal heating mode may also be referred to as a normal mode, in which engine thermal management is not required, that is, no additional heating measures are required to raise the exhaust gas temperature.

In the embodiment of the application, the exhaust gas of the engine is heated based on the current heating mode, the SCR upstream temperature and the exhaust gas temperature index of the engine are obtained, the exhaust gas temperature index comprises the gas temperature index and/or the water outlet temperature of the engine, the gas temperature index comprises the DOC upstream temperature of the oxidation catalytic converter of the engine and/or the DPF upstream temperature of the diesel particulate filter, after the mode switching is determined to be needed, the current heating mode can be switched to the next heating mode in time to heat the exhaust gas, and because the mode switching conditions corresponding to different heating modes are different, and the oil consumption of different heating modes is different, the exhaust gas temperature control is carried out based on the mode, so that the thermal management efficiency of the engine can be effectively improved, and the oil consumption is reduced.

In an alternative embodiment, step S22 may be implemented in two ways:

Mode one: determining that mode switching is required when a first mode switching condition corresponding to a current heating mode is met based on the SCR upstream temperature and the exhaust temperature index, and switching the current heating mode to a heating mode after the current heating mode in a mode sequence;

The first mode switching condition characterizes that the change trend of the temperature at the upstream of the SCR is an ascending trend. Specifically, when the first mode switching condition corresponding to the current heating mode is determined based on the SCR upstream temperature and the exhaust gas temperature index, it is indicated that the current SCR upstream temperature is rising, and the rising amplitude meets the first mode switching condition, the current heating mode may be switched to a heating mode after the current heating mode in the mode sequence, that is, to a heating mode with lower fuel consumption.

Mode two: and determining that mode switching is required when the second mode switching condition corresponding to the current heating mode is met based on the SCR upstream temperature and the exhaust temperature index, and switching the current heating mode to a heating mode before the current heating mode in a mode sequence.

The second mode switching condition characterizes that the change trend of the temperature at the upstream of the SCR is a descending trend. Specifically, when the second mode switching condition corresponding to the current heating mode is determined based on the SCR upstream temperature and the exhaust gas temperature index, it is indicated that the current SCR upstream temperature is decreasing, and the decreasing amplitude is in accordance with the second mode switching condition, the current heating mode may be switched to the heating mode before the current heating mode in the mode sequence, that is, to the heating mode having a higher effect on the increase in the exhaust gas temperature.

In the embodiment of the application, when the condition that the temperature of the upstream of the SCR and the temperature index of the exhaust gas meet the first mode switching condition corresponding to the current heating mode is monitored, the current heating mode can be switched to the heating mode with lower oil consumption, the oil consumption in the process of heating the exhaust gas of the engine is reduced, and when the condition that the temperature of the upstream of the SCR and the temperature index of the exhaust gas meet the second mode switching condition corresponding to the current heating mode is monitored, the current heating mode can be switched to the heating mode with higher effect on the rising of the temperature of the exhaust gas, the temperature of the exhaust gas of the engine is timely improved, the fluctuation of the temperature of the exhaust gas is avoided to be larger, and the thermal management efficiency is improved. By performing exhaust temperature control based on the above manner, fuel consumption can be reduced while improving thermal management efficiency of the engine.

If the exhaust temperature indicator includes the outlet water temperature, in an alternative embodiment, the first mode switching condition is: the upstream temperature of the SCR is greater than a second temperature threshold corresponding to the current heating mode, and the outlet water temperature is greater than a first water temperature threshold corresponding to the current heating mode; the second mode switching condition is: the upstream temperature of the SCR is smaller than or equal to a second temperature threshold corresponding to the current heating mode, and the outlet water temperature is smaller than or equal to a first water temperature threshold corresponding to the current heating mode.

Specifically, taking the current heating mode as an example of the forced heating mode, when the upstream temperature of the SCR is greater than a second temperature threshold T1 corresponding to the forced heating mode and the outlet water temperature is greater than a first water temperature threshold Tw corresponding to the current heating mode, the forced heating mode is switched to the normal heating mode; taking the current heating mode as the common heating mode as an example, when the upstream temperature of the SCR is smaller than or equal to a second temperature threshold T1 corresponding to the common heating mode and the outlet water temperature is smaller than or equal to a first water temperature threshold Tw corresponding to the current heating mode, the common heating mode is switched to the forced heating mode.

In addition, when the engine is cold started, both the SCR upstream temperature and the outlet water temperature are close to room temperature, and both the second temperature threshold and the first water temperature threshold are higher than room temperature, so the exhaust gas is generally first heated using an imposed heating mode from the start of the engine cold start.

If the exhaust temperature index includes a gas temperature index, according to the difference of the air temperature index, the exhaust temperature index can be specifically divided into the following three cases:

Case 1: the gas temperature indicator includes a DOC upstream temperature, and the first mode switching condition is: within a preset time length, the upstream temperature of the SCR belongs to an upstream temperature interval corresponding to the current heating mode, the upstream temperature of the DOC is greater than or equal to a first upstream temperature threshold corresponding to the current heating mode, and the upstream temperature of the DOC is greater than a first upstream rate threshold corresponding to the current heating mode; the second mode switching condition is: and within a preset time period, the temperature of the upstream of the SCR belongs to a falling temperature interval corresponding to the current heating mode, the temperature of the upstream of the DOC is smaller than or equal to a first falling temperature threshold corresponding to the current heating mode, and the falling rate of the temperature of the upstream of the DOC is larger than the first falling rate threshold corresponding to the current heating mode.

Specifically, taking the current heating mode as an example of a heat preservation heating mode, if the temperature of the upstream of the SCR is (T2, T3) and the temperature of the upstream of the DOC is greater than or equal to T4 and the rising rate of the temperature of the upstream of the DOC is greater than V1 within T seconds, switching the heat preservation heating mode into a normal mode so as to reduce the oil consumption; if the temperature at the upstream of the SCR belongs to (T5, T6) and the temperature at the upstream of the DOC is less than or equal to T7 and the rate of decrease of the temperature at the upstream of the DOC is greater than V2 within T seconds, the thermal insulation heating mode is switched to the common heating mode so as to quickly increase the temperature of the exhaust gas.

For the same heating mode, the corresponding upper temperature interval is higher than the lower temperature interval, and the upper temperature threshold is higher than the lower temperature threshold, for example, the upper temperature interval is (240, 280), the lower temperature interval is (100, 120), the upper temperature threshold is 300, and the lower temperature threshold is 80.

In the embodiment of the application, the DOC upstream temperature is faster than the SCR upstream temperature, the change trend of the SCR upstream temperature can be prejudged by monitoring the DOC upstream temperature and the DOC upstream temperature change rate, the heat management is carried out in advance, the temperature is switched to a proper heating mode, the post-treatment is kept at a proper temperature under the multi-mode fine management, the temperature of the engine can be quickly raised to enable the engine to run in a normal mode as much as possible, the heat management requirement is met, and meanwhile, the fuel consumption sacrifice is also considered to be as little as possible, so that the DOC upstream temperature is suitable for being applied to various special Beijing five-emission standards, national sixth-stage motor vehicle pollutant emission standards, european sixth-stage emission standards and non-road fourth-stage emission standards, wherein the special Beijing five-emission standards refer to newly-added local standards for Beijing-required motor vehicles on the basis of reaching national fifth-stage motor vehicle pollutant emission standards.

Case 2: the gas temperature indicator includes a DPF upstream temperature, and the first mode switching condition is: within a preset duration, the upstream temperature of the SCR belongs to an upstream temperature interval corresponding to the current heating mode, the upstream temperature of the DPF is greater than or equal to a second upstream temperature threshold corresponding to the current heating mode, and the upstream temperature of the DPF is greater than a second upstream rate threshold corresponding to the current heating mode; the second mode switching condition is: and within a preset time period, the upstream temperature of the SCR belongs to a descending temperature interval corresponding to the current heating mode, the upstream temperature of the DPF is smaller than or equal to a second descending temperature threshold corresponding to the current heating mode, and the descending rate of the upstream temperature of the DPF is larger than the second descending rate threshold corresponding to the current heating mode.

Specifically, in the aftertreatment system of the engine, the DOC upstream temperature change rate > the DPF upstream temperature change rate > the SCR upstream temperature change rate is compared in terms of the temperature change rate, so that the SCR upstream temperature can be predicted by detecting the DPF upstream temperature, and the detailed description will be omitted herein.

Case 3: the gas temperature index includes a DOC upstream temperature and a DPF upstream temperature, and the first mode switching condition is: within a preset duration, the SCR upstream temperature belongs to an ascending temperature interval corresponding to the current heating mode, the DOC upstream temperature is greater than or equal to a third ascending temperature threshold corresponding to the current heating mode, the ascending rate of the DOC upstream temperature is greater than a third ascending rate threshold corresponding to the current heating mode, the DPF upstream temperature is greater than or equal to a fourth ascending temperature threshold corresponding to the current heating mode, and the ascending rate of the DPF upstream temperature is greater than a fourth ascending rate threshold corresponding to the current heating mode; the second mode switching condition is: within a preset time period, the temperature of the upstream of the SCR belongs to a cooling down temperature interval corresponding to the current heating mode, the temperature of the upstream of the DOC is smaller than or equal to a third cooling down temperature threshold corresponding to the current heating mode, the cooling down rate of the temperature of the upstream of the DOC is larger than a third cooling down rate threshold corresponding to the current heating mode, the temperature of the upstream of the DPF is smaller than or equal to a fourth cooling down temperature threshold corresponding to the current heating mode, and the cooling down rate of the temperature of the upstream of the DPF is larger than a fourth cooling down rate threshold corresponding to the current heating mode.

Specifically, in case 3, the gas temperature index includes the DOC upstream temperature and the DPF upstream temperature, and thus it is possible to determine whether or not the mode switching is required based on three indexes of the SCR upstream temperature, the DOC upstream temperature, and the DPF upstream temperature. By detecting the DOC upstream temperature and the DOC upstream temperature change rate and the DPF upstream temperature change rate, the change trend of the SCR upstream temperature can be prejudged, the thermal management is performed in advance, and the thermal management efficiency is improved.

If the exhaust temperature index includes a gas temperature index and a water outlet temperature, according to the difference of the air temperature index, the exhaust temperature index can be specifically divided into the following three conditions:

Case 4: the gas temperature indicator includes a DOC upstream temperature, and the first mode switching condition is: within a preset time period, the upstream temperature of the SCR belongs to an ascending temperature interval corresponding to the current heating mode, the outlet water temperature is larger than a second water temperature threshold corresponding to the current heating mode, the upstream temperature of the DOC is larger than or equal to a fifth ascending temperature threshold corresponding to the current heating mode, and the ascending rate of the upstream temperature of the DOC is larger than a fifth ascending rate threshold corresponding to the current heating mode; the second mode switching condition is: and within a preset time period, the temperature of the upstream of the SCR belongs to a falling temperature interval corresponding to the current heating mode, the temperature of the outlet water is smaller than or equal to a second water temperature threshold corresponding to the current heating mode, the temperature of the upstream of the DOC is smaller than or equal to a fifth falling temperature threshold corresponding to the current heating mode, and the falling rate of the temperature of the upstream of the DOC is larger than a fifth falling rate threshold corresponding to the current heating mode.

Specifically, in case 4, it may be determined whether or not mode switching is required based on three indicators of SCR upstream temperature, DOC upstream temperature, and outlet water temperature. The newly increased water temperature is used as a judging index, so that the change trend of the upstream temperature of the SCR can be accurately predicted.

Case 5: the gas temperature indicator includes a DPF upstream temperature, and the first mode switching condition is: within a preset time period, the upstream temperature of the SCR belongs to an upstream temperature interval corresponding to the current heating mode, the outlet water temperature is greater than a third water temperature threshold corresponding to the current heating mode, the upstream temperature of the DPF is greater than or equal to a sixth upstream temperature threshold corresponding to the current heating mode, and the upstream temperature of the DPF is greater than a sixth upstream rate threshold corresponding to the current heating mode; the second mode switching condition is: and within a preset time period, the upstream temperature of the SCR belongs to a descending temperature interval corresponding to the current heating mode, the outlet water temperature is smaller than or equal to a third water temperature threshold corresponding to the current heating mode, the upstream temperature of the DPF is smaller than or equal to a sixth descending temperature threshold corresponding to the current heating mode, and the descending rate of the upstream temperature of the DPF is larger than a sixth descending rate threshold corresponding to the current heating mode.

Specifically, in case 4, it may be determined whether or not the mode switching is required based on three indicators of the SCR upstream temperature, the DPF upstream temperature, and the outlet water temperature.

Case 6: the gas temperature index includes a DOC upstream temperature and a DPF upstream temperature, and the first mode switching condition is: within a preset duration, the upstream temperature of the SCR belongs to an upstream temperature interval corresponding to a current heating mode, the outlet water temperature is larger than a fourth water temperature threshold corresponding to the current heating mode, the upstream temperature of the DOC is larger than or equal to a seventh upstream temperature threshold corresponding to the current heating mode, the upstream temperature of the DOC is larger than a seventh upstream temperature threshold corresponding to the current heating mode, the upstream temperature of the DPF is larger than or equal to an eighth upstream temperature threshold corresponding to the current heating mode, and the upstream temperature of the DPF is larger than an eighth upstream temperature threshold corresponding to the current heating mode; the second mode switching condition is: and within a preset time period, the temperature of the upstream of the SCR belongs to a descending temperature interval corresponding to the current heating mode, the temperature of the effluent is smaller than or equal to a fourth water temperature threshold corresponding to the current heating mode, the temperature of the upstream of the DOC is smaller than or equal to a seventh descending temperature threshold corresponding to the current heating mode, the descending rate of the temperature of the upstream of the DOC is larger than the seventh descending rate threshold corresponding to the current heating mode, the temperature of the upstream of the DPF is smaller than or equal to an eighth descending temperature threshold corresponding to the current heating mode, and the descending rate of the temperature of the upstream of the DPF is larger than the eighth descending rate threshold corresponding to the current heating mode.

Specifically, in case 6, it may be determined whether or not a mode switch is required based on four indicators of SCR upstream temperature, DOC upstream temperature, DPF upstream temperature, and outlet water temperature. By detecting the DOC upstream temperature, the DOC upstream temperature change rate, the DPF upstream temperature change rate and the outlet water temperature, the change trend of the SCR upstream temperature can be accurately prejudged, the thermal management is performed in advance, and the thermal management efficiency is improved.

According to the embodiment of the application, seven conditions of determining whether mode switching is needed according to different exhaust temperature indexes and different gas temperature indexes in the exhaust temperature indexes are provided, and the mode switching is performed based on the above mode, so that the engine can be quickly warmed to operate in a normal mode as much as possible, and the heat management requirement is met while the fuel consumption is reduced as much as possible.

The following describes four heating modes in the present application in detail:

Imposed heating mode: the method is characterized in that the fuel consumption is not considered under the forced heating mode, the engine oil is opened for post-injection through the actions of an air inlet valve and an air outlet valve (distinguished by load rates, a small-load air outlet throttle valve, a medium-load air inlet throttle valve or an air outlet throttle valve) so as to quickly raise the temperature, and when the water outlet temperature is more than Tw (water temperature threshold) and the upstream temperature of SCR is more than T8 (second temperature threshold), the forced heating mode is exited;

Common heating mode: the NOx emission amount in the common heating mode is between the forced heating mode and the heat preservation heating mode, the temperature is raised through the action of an air inlet valve and an air outlet valve (distinguished according to the load rate, a small-load air outlet throttle valve, a medium-load air inlet valve or an air outlet throttle valve), the fuel consumption is less than that in the forced heating mode, the SCR temperature is taken as a monitoring target, and the common heating mode can be entered for a plurality of times;

Thermal insulation heating mode: meanwhile, the fuel consumption and the dynamic performance are considered, the NOx emission is equal to or slightly lower than that of the normal mode, and the temperature is raised through the actions of the air inlet valve and the air outlet valve (a small-load air inlet valve and a medium-load air outlet valve), and the DOC upstream temperature, the DOC temperature change rate and the SCR upstream temperature are taken as monitoring targets;

normal mode: in this mode, the SCR upstream temperature is higher than T9, and the exhaust gas is not required to be heated, so that the economy and the power performance of the engine are all in the optimal state.

In the embodiment of the application, the running interval of the engine is finely managed through multi-mode distinction, indexes such as the outlet water temperature, the DOC upstream temperature change rate and the like are newly increased, and heating means such as the air inlet throttle valve, the air outlet throttle valve, the post-injection throttle valve, the advance angle and the like are used in different degrees through different heating modes. From the cold engine of the engine to the heat engine, the proper post-treatment temperature can be stably maintained under the full working condition.

In an alternative embodiment, exhaust gas pollutant absorption is performed by:

the exhaust gas is subjected to pollutant absorption based on an after-treatment system of the engine, wherein the after-treatment system comprises SCR and DOC.

Specifically, a portion of the exhaust gas of the engine is oxidized based on the DOC, for example, NO is oxidized to NO2, CO is oxidized to CO2, CH is oxidized to CO2 and water, NOx in the exhaust gas is removed based on the SCR, and the reaction of the reducing agent with NOx is promoted by the SCR catalyst while suppressing the non-selective oxidation reaction of the reducing agent with oxygen.

Referring to fig. 3, an overall flow chart of a temperature control method according to an embodiment of the present application is shown, where Tn > Tf > Te > Tc > Tb > Ta, tp > Tg > Tj > Td, the temperature is calibrated according to the engine requirement, and Tw is calibrated according to the actual situation. Since the current exhaust temperature is close to room temperature, starting from a cold start of the engine, well below the appropriate temperature required by the aftertreatment system by 400 °, a forced heating mode is first used, the priority of each heating mode being: the forced heating mode is larger than the normal heating mode, the heat preservation heating mode is larger than the normal mode.

Under the forced heating mode, the water outlet temperature is less than or equal to Tw and the upstream temperature of the SCR is less than or equal to Ta, when the water outlet temperature is more than Tw and the upstream temperature of the SCR is more than Ta, the heating mode can be switched into the normal mode directly, and if the upstream temperature of the SCR is more than Tf.

Under the common heating mode, when the SCR upstream temperature is larger than Ta, tb is smaller than the SCR upstream temperature and smaller than or equal to Tc, the DOC upstream temperature/DPF upstream temperature is larger than or equal to Td, and the rising rate of the DOC upstream temperature/DPF upstream temperature is larger than V1, the control device can switch to a heat preservation heating mode, and if the SCR upstream temperature is larger than Tf, the control device can directly switch to a normal mode.

In the heat-preserving and heating mode, when Te < SCR upstream temperature is smaller than or equal to Tf and DOC upstream temperature/DPF upstream temperature is larger than or equal to Tg within t seconds, and the rising rate of DOC upstream temperature/DPF upstream temperature is larger than V2, the mode can be switched into the normal mode, and if the conditions are not met, the mode can be switched into the normal mode only when SCR upstream temperature is larger than Tf. And when Tc is smaller than the SCR upstream temperature and smaller than or equal to Ti and DOC upstream temperature/DPF upstream temperature is smaller than or equal to Tj in t seconds and the descending rate of DOC upstream temperature/DPF upstream temperature is larger than V1, switching to a common heating mode to quickly improve the exhaust temperature.

In the normal mode, the upstream temperature of the SCR is more than Tf, and when Tf is less than the upstream temperature of the SCR and less than or equal to Tn, the upstream temperature of the DOC/the upstream temperature of the DPF is less than or equal to Tp, and the rate of decrease of the upstream temperature of the DOC/the upstream temperature of the DPF is more than V2, the temperature-keeping heating mode can be switched; when the upstream temperature of the SCR is less than or equal to Tc, the common heating mode can be switched.

In the embodiment of the application, the transient operation characteristics of the whole vehicle are researched, the operation characteristics of the whole vehicle are simplified into specific models, the exhaust model characteristics are considered, the exhaust temperature characteristics are simplified into corresponding models, the requirements of thermal management are analyzed according to the proposed modes by organically combining, a unique thermal management method and strategy are formed, the temperature of the engine can be quickly raised to enable the engine to operate in a normal mode as much as possible, and the fuel consumption is reduced while the thermal management requirements are met.

Based on the same inventive concept, the embodiment of the application also provides a temperature control device. As shown in fig. 4, which is a schematic structural diagram of the temperature control device 400, may include:

a heating unit 401, configured to heat exhaust gas of an engine based on a current heating mode, and obtain an SCR upstream temperature and an exhaust gas temperature index of a selective catalytic reduction reactor of the engine; wherein the exhaust gas temperature index comprises a gas temperature index and/or an engine water outlet temperature, and the gas temperature index comprises an oxidation catalytic converter DOC upstream temperature and/or a diesel particulate filter DPF upstream temperature of the engine;

A switching unit 402, configured to switch, based on the SCR upstream temperature and the exhaust gas temperature index, the current heating mode to the next heating mode to heat the exhaust gas after determining that the mode switching is required; wherein, the mode switching conditions corresponding to different heating modes are different, and the fuel consumption of different heating modes is different.

Optionally, the switching unit 402 is specifically configured to:

Determining that mode switching is required when a first mode switching condition corresponding to a current heating mode is met based on the SCR upstream temperature and the exhaust temperature index, and switching the current heating mode to a heating mode after the current heating mode in a mode sequence, wherein the first mode switching condition represents that the change trend of the SCR upstream temperature is an ascending trend;

And determining that mode switching is required when a second mode switching condition corresponding to the current heating mode is met based on the SCR upstream temperature and the exhaust temperature index, and switching the current heating mode to a heating mode before the current heating mode in a mode sequence, wherein the second mode switching condition represents that the change trend of the SCR upstream temperature is a descending trend.

Optionally, if the exhaust gas temperature indicator includes a gas temperature indicator, the gas temperature indicator includes a DOC upstream temperature, the first mode switching condition is:

Within a preset time length, the upstream temperature of the SCR belongs to an upstream temperature interval corresponding to the current heating mode, the upstream temperature of the DOC is greater than or equal to a first upstream temperature threshold corresponding to the current heating mode, and the upstream temperature of the DOC is greater than a first upstream rate threshold corresponding to the current heating mode;

the second mode switching condition is:

And within a preset time period, the temperature of the upstream of the SCR belongs to a falling temperature interval corresponding to the current heating mode, the temperature of the upstream of the DOC is smaller than or equal to a first falling temperature threshold corresponding to the current heating mode, and the falling rate of the temperature of the upstream of the DOC is larger than the first falling rate threshold corresponding to the current heating mode.

Optionally, if the exhaust gas temperature indicator includes a gas temperature indicator, the gas temperature indicator includes a DPF upstream temperature, the first mode switching condition is:

Within a preset duration, the upstream temperature of the SCR belongs to an upstream temperature interval corresponding to the current heating mode, the upstream temperature of the DPF is greater than or equal to a second upstream temperature threshold corresponding to the current heating mode, and the upstream temperature of the DPF is greater than a second upstream rate threshold corresponding to the current heating mode;

the second mode switching condition is:

and within a preset time period, the upstream temperature of the SCR belongs to a descending temperature interval corresponding to the current heating mode, the upstream temperature of the DPF is smaller than or equal to a second descending temperature threshold corresponding to the current heating mode, and the descending rate of the upstream temperature of the DPF is larger than the second descending rate threshold corresponding to the current heating mode.

Optionally, if the exhaust temperature indicator includes a water outlet temperature, the first mode switching condition is:

the second mode switching condition is:

Alternatively, the pattern order is determined based on the fuel consumption of each heating pattern from high to low.

Optionally, the apparatus further comprises a processing unit 403 for:

For convenience of description, the above parts are described as being functionally divided into modules (or units) respectively. Of course, the functions of each module (or unit) may be implemented in the same piece or pieces of software or hardware when implementing the present application.

Having described the temperature control method and apparatus of the exemplary embodiments of the present application, next, an electronic device and a computing apparatus according to another exemplary embodiment of the present application are described.

Based on the same inventive concept as the above-mentioned method embodiment, an electronic device is further provided in the embodiment of the present application, and referring to fig. 5, which is a schematic diagram of a hardware composition structure of an electronic device to which the embodiment of the present application is applied, the electronic device 50 may at least include a processor 51 and a memory 52. Wherein the memory 52 stores program code that, when executed by the processor 51, causes the processor 51 to perform the steps of any one of the temperature control methods described above.

In some possible embodiments, an electronic device according to the application may comprise at least one processor and at least one memory. Wherein the memory stores program code that, when executed by the processor, causes the processor to perform the temperature control steps according to the various exemplary embodiments of the application described hereinabove. For example, the processor may perform the steps as shown in fig. 2.

A computing device 600 according to such an embodiment of the application is described below with reference to fig. 6. As shown in fig. 6, computing device 600 is in the form of a general purpose computing device. Components of computing device 600 may include, but are not limited to: the at least one processing unit 601, the at least one memory unit 602, a bus 603 connecting the different system components, including the memory unit 602 and the processing unit 601.

Bus 603 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a processor, and a local bus using any of a variety of bus architectures.

The storage unit 602 may include readable media in the form of volatile memory such as Random Access Memory (RAM) 621 and/or cache memory 622, and may further include Read Only Memory (ROM) 623.

The storage unit 602 may also include a program/utility 625 having a set (at least one) of program modules 624, such program modules 624 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment.

The computing device 600 may also communicate with one or more external devices 604 (e.g., keyboard, pointing device, etc.), one or more devices that enable objects to interact with the computing device 600, and/or any devices (e.g., routers, modems, etc.) that enable the computing device 600 to communicate with one or more other computing devices. Such communication may occur through an input/output (I/O) interface 605. Moreover, computing device 600 may also communicate with one or more networks such as a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the Internet, through network adapter 606. As shown, network adapter 606 communicates with other modules for computing device 600 over bus 603. It should be appreciated that although not shown, other hardware and/or software modules may be used in connection with computing device 600, including, but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID systems, tape drives, data backup storage systems, and the like.

Those skilled in the art will appreciate that the various aspects of the application may be implemented as a system, method, or program product. Accordingly, aspects of the application may be embodied in the following forms, namely: an entirely hardware embodiment, an entirely software embodiment (including firmware, micro-code, etc.) or an embodiment combining hardware and software aspects may be referred to herein as a "circuit," module "or" system.

In some possible embodiments, aspects of the temperature control method provided by the present application may also be implemented in the form of a program product comprising a computer program for causing an electronic device to perform the steps of the temperature control method according to the various exemplary embodiments of the application described herein above when the program product is run on the electronic device, e.g. the electronic device may perform the steps as shown in fig. 2.

The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: an electrical connection having one or more wires, a portable disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

The program product of embodiments of the present application may take the form of a portable compact disc read only memory (CD-ROM) and comprise a computer program and may be run on an electronic device. However, the program product of the present application is not limited thereto, and in this document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with a command execution system, apparatus, or device.

The readable signal medium may comprise a data signal propagated in baseband or as part of a carrier wave in which a readable computer program is embodied. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with a command execution system, apparatus, or device.

A computer program embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

Computer programs for performing the operations of the present application may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer program may execute entirely on the consumer electronic device, partly on the consumer electronic device, as a stand-alone software package, partly on the consumer electronic device and partly on a remote electronic device or entirely on the remote electronic device or server. In the case of remote electronic devices, the remote electronic device may be connected to the consumer electronic device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external electronic device (e.g., connected through the internet using an internet service provider).

It should be noted that although several units or sub-units of the apparatus are mentioned in the above detailed description, such a division is merely exemplary and not mandatory. Indeed, the features and functions of two or more of the elements described above may be embodied in one element in accordance with embodiments of the present application. Conversely, the features and functions of one unit described above may be further divided into a plurality of units to be embodied.

Furthermore, although the operations of the methods of the present application are depicted in the drawings in a particular order, this is not required or suggested that these operations must be performed in this particular order or that all of the illustrated operations must be performed in order to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having a computer-usable computer program embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program commands may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the commands executed by the processor of the computer or other programmable data processing apparatus produce means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program commands may also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the commands stored in the computer readable memory produce an article of manufacture including command means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While 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. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A method of temperature control, the method comprising:

Heating exhaust gas of an engine based on a current heating mode, and acquiring an upstream temperature and an exhaust gas temperature index of a selective catalytic reduction reactor of the engine; wherein the exhaust gas temperature index comprises a gas temperature index and a water outlet temperature of the engine, and the gas temperature index comprises an upstream temperature of an oxidation catalytic converter and/or an upstream temperature of a diesel particulate filter of the engine;

based on the upstream temperature of the selective catalytic reduction reactor and the exhaust gas temperature index, after determining that mode switching is required, switching the current heating mode to a next heating mode to heat the exhaust gas; the mode switching conditions corresponding to different heating modes are different, and the fuel consumption of the different heating modes is different;

Wherein, based on the upstream temperature of the selective catalytic reduction reactor and the exhaust gas temperature index, after determining that the mode switching is required, switching the current heating mode to the next heating mode to heat the exhaust gas includes:

Determining that mode switching is required when a first mode switching condition corresponding to the current heating mode is met based on the upstream temperature of the selective catalytic reduction reactor and the exhaust temperature index, and switching the current heating mode to a heating mode positioned behind the current heating mode in a mode sequence, wherein the first mode switching condition represents that the change trend of the upstream temperature of the selective catalytic reduction reactor is an ascending trend;

The first mode switching condition is: the upstream temperature of the selective catalytic reduction reactor is greater than a second temperature threshold corresponding to the current heating mode, and the outlet water temperature is greater than a first water temperature threshold corresponding to the current heating mode.

2. The method of claim 1, wherein switching the current heating mode to a next heating mode to heat the exhaust gas after determining that a mode switch is required based on the temperature upstream of the selective catalytic reduction reactor and the exhaust gas temperature indicator, further comprises:

and determining that mode switching is required when determining that a second mode switching condition corresponding to the current heating mode is met based on the upstream temperature of the selective catalytic reduction reactor and the exhaust temperature index, and switching the current heating mode to a heating mode before the current heating mode in the mode sequence, wherein the second mode switching condition represents that the change trend of the upstream temperature of the selective catalytic reduction reactor is a descending trend.

3. The method of claim 2, wherein the gas temperature indicator comprises a temperature upstream of the oxidation catalyst, and the second mode switching condition is:

And within a preset duration, the upstream temperature of the selective catalytic reduction reactor belongs to a falling temperature interval corresponding to the current heating mode, the upstream temperature of the oxidation catalytic converter is smaller than or equal to a first falling temperature threshold corresponding to the current heating mode, and the falling rate of the upstream temperature of the oxidation catalytic converter is larger than the first falling rate threshold corresponding to the current heating mode.

4. The method of claim 2, wherein the gas temperature indicator comprises a temperature upstream of the diesel particulate filter, and the second mode switching condition is:

And within a preset duration, the upstream temperature of the selective catalytic reduction reactor belongs to a falling temperature interval corresponding to the current heating mode, the upstream temperature of the diesel particulate filter is smaller than or equal to a second falling temperature threshold corresponding to the current heating mode, and the falling rate of the upstream temperature of the diesel particulate filter is larger than the second falling rate threshold corresponding to the current heating mode.

5. The method of claim 2, wherein the second mode switching condition is:

The upstream temperature of the selective catalytic reduction reactor is smaller than or equal to a second temperature threshold corresponding to the current heating mode, and the outlet water temperature is smaller than or equal to a first water temperature threshold corresponding to the current heating mode.

6. The method of claim 2, wherein the pattern order is determined based on a high to low fuel consumption of each heating pattern.

7. A temperature control apparatus, comprising:

The heating unit is used for heating the exhaust gas of the engine based on the current heating mode and acquiring the upstream temperature and the exhaust gas temperature index of the selective catalytic reduction reactor of the engine; wherein the exhaust gas temperature index comprises a gas temperature index and a water outlet temperature of the engine, and the gas temperature index comprises an upstream temperature of an oxidation catalytic converter and/or an upstream temperature of a diesel particulate filter of the engine;

The switching unit is used for switching the current heating mode to the next heating mode to heat the exhaust after determining that the mode switching is required based on the upstream temperature of the selective catalytic reduction reactor and the exhaust temperature index; the mode switching conditions corresponding to different heating modes are different, and the fuel consumption of the different heating modes is different;

8. An electronic device comprising a processor and a memory, wherein the memory stores a computer program which, when executed by the processor, causes the processor to perform the steps of the method of any of claims 1 to 6.

9. A computer readable storage medium, characterized in that it comprises a computer program for causing an electronic device to execute the steps of the method according to any one of claims 1-6 when said computer program is run on the electronic device.

10. A computer program product comprising a computer program, the computer program being stored on a computer readable storage medium; when the computer program is read from the computer readable storage medium by a processor of an electronic device, the processor executes the computer program, causing the electronic device to perform the steps of the method of any one of claims 1-6.