CN111535903B - Method, device and electronic equipment for removing reactor crystals - Google Patents

Abstract

The application provides a method, a device and electronic equipment for clearing reactor crystals, wherein when an engine runs, whether the reading of a first timer is equal to the duration of a preset first period or not is detected in real time; if the reading of the first timer is equal to the duration of the first period, judging whether the duration of the accumulated high-temperature state of the selective catalytic reduction reactor in the current first period is greater than the early warning duration, and the first closed-loop temperature is greater than the lowest decomposition temperature of the reactor crystals; if the judgment result is yes, continuously adjusting the temperature of the exhaust gas at the inlet of the selective catalytic reduction reactor based on the target temperature within a preset duration by taking the first closed-loop temperature as the target temperature; the first timer is reset and the reading of the first timer continues to be detected in real time. The scheme adjusts the temperature of the waste gas at the inlet of the selective catalytic reduction reactor to be higher than the lowest decomposition temperature of the crystals in the reactor, thereby promoting the decomposition of the crystals and achieving the effect of removing the crystals.

Description

Method, device and electronic equipment for removing reactor crystals

Technical Field

The invention relates to the technical field of engine post-treatment, in particular to a method and a device for removing reactor crystals and electronic equipment.

Background

In order to control the pollution of the automobile exhaust gas to the environment, the existing automobile engine is generally provided with a plurality of post-treatment devices for purifying the exhaust gas discharged by the engine. Selective Catalytic Reduction (SCR) is one type of aftertreatment device that is currently used in diesel engines. And a urea injection system connected with the SCR injects urea into the SCR box body when the engine runs, so that the urea reacts with the exhaust gas flowing through the SCR box body, and nitrogen oxides in the exhaust gas are reduced into ammonia and carbon dioxide.

During operation of the SCR, as the reaction environment changes, the reaction may produce products (e.g., melamine) that are not readily decomposed and accumulate within the SCR housing, causing crystallization of the SCR housing and the urea nozzle connected to the housing. And the crystallization can cause the treatment efficiency of the SCR on the exhaust gas to be reduced and even damage the SCR.

Therefore, in order to ensure the treatment efficiency of SCR and prolong the service life of SCR, a solution for effectively removing the crystallization of SCR needs to be provided.

Disclosure of Invention

In view of the above-identified problems with the prior art, the present application provides a method, apparatus, and electronic device for removing crystals from a reactor to remove crystals from a selective catalytic reduction reactor of an engine.

In a first aspect, the present application provides a method for removing crystals from a reactor, comprising:

detecting whether the reading of the first timer is equal to the preset duration of the first period in real time when the engine runs; the first timer is used for recording the accumulated running time of the engine;

if the reading of the first timer is equal to the preset first period of time, judging whether the accumulated high-temperature-state time of the selective catalytic reduction reactor in the current first period is longer than the preset early warning time; wherein the current first period refers to a first period recorded by the first timer; the high temperature state refers to a state in which the temperature of the exhaust gas at the inlet of the selective catalytic reduction reactor is greater than or equal to a preset first closed loop temperature; the first loop closure temperature is greater than a minimum decomposition temperature of crystallization of the selective catalytic reduction reactor;

if the accumulated high-temperature state duration of the selective catalytic reduction reactor in the current first period is less than or equal to the early warning duration, executing a first thermal management strategy; wherein the first thermal management strategy is to continuously adjust the exhaust gas temperature at the inlet of the selective catalytic reduction reactor based on a first closed loop temperature as a target temperature for a preset duration; the duration is determined according to the early warning duration and the duration of the accumulated high-temperature state of the selective catalytic reduction reactor in the current first period;

and resetting the first timer and returning to the execution of the real-time detection of whether the reading of the first timer is equal to the preset first period when the engine runs.

Optionally, before determining whether the accumulated time length of the selective catalytic reduction reactor in the high temperature state in the current first period is greater than a preset early warning time length, the method further includes:

judging whether the processing efficiency reduction rate of the selective catalytic reduction reactor in the current first period is greater than a preset reduction rate threshold value or not;

if the processing efficiency reduction rate of the selective catalytic reduction reactor in the current first period is larger than the reduction rate threshold value, executing a second thermal management strategy; wherein the second thermal management strategy is to continuously adjust the exhaust gas temperature at the inlet of the selective catalytic reduction reactor based on a second closed loop temperature as a target temperature and a preset first heating time period as a duration time period; wherein the second closed loop temperature is greater than the first closed loop temperature;

wherein the judging whether the accumulated high-temperature state duration of the selective catalytic reduction reactor in the current first period is greater than a preset early warning duration comprises:

if the processing efficiency reduction rate of the selective catalytic reduction reactor in the current first period is smaller than or equal to the reduction rate threshold, judging whether the accumulated time length of the selective catalytic reduction reactor in the high-temperature state in the current first period is larger than a preset early warning time length.

Optionally, the method further includes:

detecting whether the reading of the second timer is equal to the duration of a preset second period in real time when the engine runs; the second timer is used for recording the accumulated running time of the engine;

if the reading of the second timer is equal to the duration of the second period, judging whether the particulate matter trap of the engine is regenerated in the current second period; wherein the current second period refers to a second period recorded by the second timer;

if the particulate matter trap of the engine is not regenerated in the current second period, executing a third thermal management strategy; wherein the third thermal management strategy is to continuously adjust the exhaust gas temperature at the inlet of the selective catalytic reduction reactor based on a preset third closed-loop temperature as a target temperature and a preset second heating time as a duration, and the duration is based on the target temperature; the third closed-loop temperature is greater than the second closed-loop temperature;

and after the third thermal management strategy is successfully executed, resetting the second timer, and returning to execute the real-time detection of whether the reading of the second timer is equal to the preset second period when the engine runs.

Optionally, the first closed-loop temperature is 350 ℃, the second closed-loop temperature is 500 ℃, and the third closed-loop temperature is 600 ℃.

Optionally, the continuously adjusting the temperature of the exhaust gas at the inlet of the selective catalytic reduction reactor based on the target temperature for the duration comprises:

detecting whether the current exhaust gas temperature at the inlet of the selective catalytic reduction reactor is lower than a target temperature in real time within a preset duration;

if the current exhaust gas temperature at the inlet of the selective catalytic reduction reactor is greater than or equal to the target temperature, controlling the heating equipment at the inlet of the selective catalytic reduction reactor to be in a closed state;

and if the current exhaust gas temperature at the inlet of the selective catalytic reduction reactor is lower than the target temperature, controlling the heating equipment at the inlet of the selective catalytic reduction reactor to be in an open state, so as to heat the exhaust gas entering the selective catalytic reduction reactor.

In a second aspect, the present application provides an apparatus for removing crystals from a reactor, comprising:

the timing unit is used for detecting whether the reading of the first timer is equal to the preset duration of the first period in real time when the engine runs; the second timer is used for recording the accumulated running time of the engine;

the judging unit is used for judging whether the accumulated high-temperature-state time of the selective catalytic reduction reactor in the current first period is longer than the preset early warning time if the reading of the first timer is equal to the preset first period time; wherein the current first period refers to a first period recorded by the first timer; the high temperature state refers to a state in which the temperature of the exhaust gas at the inlet of the selective catalytic reduction reactor is greater than or equal to a preset first closed loop temperature; the first loop closure temperature is greater than a minimum decomposition temperature of crystallization of the selective catalytic reduction reactor;

the execution unit is used for executing a first thermal management strategy if the accumulated high-temperature state duration of the selective catalytic reduction reactor in the current first period is less than or equal to the early warning duration; wherein the first thermal management strategy is to continuously adjust the exhaust gas temperature at the inlet of the selective catalytic reduction reactor based on a first closed loop temperature as a target temperature for a preset duration; the duration is determined according to the early warning duration and the duration of the accumulated high-temperature state of the selective catalytic reduction reactor in the current first period;

and the timing unit is used for resetting the first timer and returning to the execution of the real-time detection of whether the reading of the first timer is equal to the preset duration of the first period when the engine runs.

Optionally, the determining unit is further configured to:

judging whether the processing efficiency reduction rate of the selective catalytic reduction reactor in the current first period is greater than a preset reduction rate threshold value or not;

the execution unit is further to: if the processing efficiency reduction rate of the selective catalytic reduction reactor in the current first period is larger than the reduction rate threshold value, executing a second thermal management strategy; wherein the second thermal management strategy is to continuously adjust the exhaust gas temperature at the inlet of the selective catalytic reduction reactor based on a second closed loop temperature as a target temperature and a preset first heating time period as a duration time period; wherein the second closed loop temperature is greater than the first closed loop temperature;

the judging unit is used for judging whether the accumulated high-temperature state duration of the selective catalytic reduction reactor in the current first period is longer than a preset early warning duration, and is specifically used for:

if the processing efficiency reduction rate of the selective catalytic reduction reactor in the current first period is smaller than or equal to the reduction rate threshold, judging whether the accumulated time length of the selective catalytic reduction reactor in the high-temperature state in the current first period is larger than a preset early warning time length.

Optionally, the timing unit is further configured to:

detecting whether the reading of the second timer is equal to the duration of a preset second period in real time when the engine runs; the second timer is used for recording the accumulated running time of the engine;

the judging unit is further used for judging whether the particulate matter trap of the engine is regenerated in the current second period or not if the reading of the second timer is equal to the duration of the second period; wherein the current second period refers to a second period recorded by the second timer;

the execution unit is further used for executing a third thermal management strategy if the particulate matter trap of the engine is not regenerated in the current second period; wherein the third thermal management strategy is to continuously adjust the exhaust gas temperature at the inlet of the selective catalytic reduction reactor based on a preset third closed-loop temperature as a target temperature and a preset second heating time as a duration, and the duration is based on the target temperature; the third closed-loop temperature is greater than the second closed-loop temperature;

and the timing unit is further used for resetting the second timer after the third thermal management strategy is successfully executed, and returning to the step of detecting whether the reading of the second timer is equal to the duration of a preset second period in real time when the engine runs.

Optionally, when the execution unit continuously adjusts the temperature of the exhaust gas at the inlet of the selective catalytic reduction reactor based on the target temperature for the duration, the execution unit is specifically configured to:

detecting whether the current exhaust gas temperature at the inlet of the selective catalytic reduction reactor is lower than a target temperature in real time within a preset duration;

if the current exhaust gas temperature at the inlet of the selective catalytic reduction reactor is greater than or equal to the target temperature, controlling the heating equipment at the inlet of the selective catalytic reduction reactor to be in a closed state;

and if the current exhaust gas temperature at the inlet of the selective catalytic reduction reactor is lower than the target temperature, controlling the heating equipment at the inlet of the selective catalytic reduction reactor to be in an open state, so as to heat the exhaust gas entering the selective catalytic reduction reactor.

A third aspect of the present application provides an electronic device comprising a memory and a processor;

wherein the memory is used for storing programs;

the processor is configured to execute the program, which when executed is particularly configured to implement the method of clearing reactor crystals as provided in any of the first aspects of the present application.

The application provides a method, a device and electronic equipment for clearing reactor crystals, wherein when an engine runs, whether the reading of a first timer is equal to the duration of a preset first period or not is detected in real time; if the reading of the first timer is equal to the duration of the first period, judging whether the duration of the accumulated high-temperature state of the selective catalytic reduction reactor in the current first period is greater than the early warning duration, and the first closed-loop temperature is greater than the lowest decomposition temperature of the reactor crystals; if the judgment result is yes, continuously adjusting the temperature of the exhaust gas at the inlet of the selective catalytic reduction reactor based on the target temperature within a preset duration by taking the first closed-loop temperature as the target temperature; the first timer is reset and the reading of the first timer continues to be detected in real time. The scheme adjusts the temperature of the waste gas at the inlet of the selective catalytic reduction reactor to be higher than the lowest decomposition temperature of the crystals of the reactor, thereby promoting the decomposition of the crystals and achieving the effect of removing the crystals.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic illustration of an engine configured with an aftertreatment device;

FIG. 2 is a flow chart of a method for purging a reactor of crystals according to an embodiment of the present disclosure;

FIG. 3 is a flow chart of a method for purging a reactor of crystals according to yet another embodiment of the present disclosure;

FIG. 4 is a flow chart of a method for purging a reactor of crystals according to yet another embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of an apparatus for removing crystals from a reactor according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.

The method for clearing the reactor crystals is mainly applied to an engine provided with aftertreatment equipment comprising a Selective Catalytic Reduction (SCR), and is characterized in that the state of the SCR is detected every time the engine runs for a certain period to judge whether the SCR has crystallization risks, if the SCR has the crystallization risks, the temperature of exhaust gas at the inlet of the SCR is adjusted based on a preset heat management strategy, so that the temperature of the SCR is higher than the lowest decomposition temperature of the reactor crystals, the crystallization decomposition of the SCR is promoted, and the effect of clearing the crystals is achieved.

To facilitate an understanding of the method provided herein, a schematic configuration of an engine configured with an aftertreatment device is first provided, as shown in FIG. 1.

In fig. 1, after the intake air is pressurized by the supercharger and cooled by the intercooler, the intake air is mixed with a part of exhaust gas output by an EGR (exhaust gas recirculation) system, and enters the engine main body, where the intake air is mixed with fuel (the engine generally provided with aftertreatment equipment is a diesel engine, and the fuel is diesel oil) and combusted, so as to drive the engine main body to output mechanical work to the outside. The TVA in fig. 1 is an abbreviation of throttlevevactuator, named throttle actuator in chinese, for controlling the opening of the throttle valve, thereby controlling the flow rate of gas into the engine body.

After the exhaust gas output from the engine body drives the supercharger, the exhaust gas is first mixed with hydrocarbon injected from an HC (hydrocarbon) nozzle in fig. 1, then flows through an oxidation catalyst (DOC) and a particulate filter (DPF) in sequence, and finally reaches a selective catalytic reduction reactor SCR, where the exhaust gas is discharged to the atmosphere after reacting with urea.

It has been found that the crystals in the SCR are mainly polymers of cyanuric acid and melamine formed by the reaction of urea and exhaust gases at a relatively low temperature (less than 250 ℃), and that these polymers decompose automatically at ambient temperatures (i.e. the temperature of the SCR, typically the temperature of the exhaust gases measured at the inlet of the SCR representing the temperature of the SCR) of more than 300 ℃, i.e. the minimum decomposition temperature of the crystals in the SCR reactor is 300 ℃, and the higher the ambient temperature the higher the decomposition rate. Therefore, the temperature of the SCR can be increased by heating the exhaust gas at the inlet of the SCR, so that the crystal decomposition in the SCR is promoted, and the effect of clearing the crystal of the reactor (namely the SCR) is achieved.

In summary, the first embodiment of the present application provides a method for removing crystals from a reactor, please refer to fig. 2, which includes the following steps:

s201, detecting whether the reading of the first timer is equal to the preset duration of the first period in real time when the engine runs.

The first timer is used for recording the accumulated running time of the engine.

That is, the first timer will start and count when the engine is started, and if the first timer is not reset, the first timer will keep the reading when the engine stops running and the first timer is closed, i.e., the currently recorded duration is stored, and then when the engine is started again, the counting is continued from the stored duration until the first timer is reset.

Resetting the first timer means clearing the current reading of the first timer, that is, deleting the current recorded duration of the first timer, so that the first timer starts to count again from zero.

Alternatively, the first period may be set to 10 hours.

Assuming that the current reading of the first timer is 0, the engine is started, the first timer is started at the same time, the engine is stopped after continuously running for 3 hours, and the first timer is stopped at the same time, wherein the reading of the first timer (i.e. the time length recorded by the first timer) is 3 hours. When the engine is started again next time, the first timer starts to count time continuously from the reading of 3 hours, the engine is stopped after running for 2 hours this time, meanwhile, the first timer is stopped, the reading of the first timer is 5 hours at this time, and so on.

If the reading of the first timer is less than the preset first period (e.g., less than 10 hours), the step S201 is continuously executed while the engine is in the running state. If the reading of the first timer is equal to the duration of the first period, step S202 is executed.

S202, judging whether the accumulated time length of the SCR in the high-temperature state in the current first period is greater than the preset early warning time length.

If the time length of the SCR accumulated high-temperature state in the current first period is longer than the preset early warning time length, step S204 is executed, otherwise, if the time length of the SCR accumulated high-temperature state in the current first period is not longer than (i.e., is less than or equal to) the early warning time length, step S203 is executed.

Alternatively, the warning time period may be set to 0.5 hour.

The current first period refers to the first period recorded by the first timer, in other words, the current first period should be understood as the first period of the cumulative operation of the engine at the current moment.

Assuming that the engine starts when the first timer reads 0, it continues to run for 3 hours, then stops, starts again after 2 hours of stopping, stops again after 4 hours of continuing running, starts again after 3 hours of stopping, and continues to run for more than 3 hours after starting.

After the engine is started for the third time and continuously runs for 3 hours, according to the working principle of the first timer, at this time, the reading of the first timer is equal to 10 hours, step S202 is executed to detect whether the duration of the SCR in the high temperature state is longer than the preset early warning duration within 3 hours of the engine after the first start, 4 hours of the engine after the second start, and 3 hours of the engine after the third start.

In other words, step S202 may be understood as determining whether the time period during which the SCR of the engine is in the high temperature state is longer than the warning time period within 10 hours of the latest operation of the engine.

The high temperature state in this application refers to a state where the exhaust gas temperature at the SCR inlet is greater than a preset first closed loop temperature (denoted as T1). The first closed-loop temperature is higher than the lowest decomposition temperature of the crystal of the SCR, i.e. T1 is greater than 300 ℃, optionally, T1 may be set equal to 350 ℃, and of course, the value of T1 may be determined according to specific situations, as long as it is greater than the lowest decomposition temperature of the crystal, which is not limited in this application.

The time period during which the SCR is accumulated in the high temperature state may be obtained by:

a high temperature timer is set, and the high temperature timer and the first timer are reset synchronously, namely, the high temperature timer is reset every time the first timer is reset.

After the engine is started, detecting the temperature of exhaust gas at an SCR inlet in real time, starting a high-temperature timer when detecting that the temperature of the exhaust gas at the SCR inlet is higher than a first closed-loop temperature, starting the high-temperature timer to time, and closing the high-temperature timer when detecting that the temperature of the exhaust gas at the SCR inlet is lower than or equal to the first closed-loop temperature, and keeping the current reading of the high-temperature timer.

In this way, when step S202 is executed, it is only necessary to read the reading of the high temperature timer to obtain the time length of the SCR accumulated in the high temperature state in the first period of the latest operation of the engine recorded by the first timer.

As described above, the crystals of the SCR are automatically decomposed in the environment higher than 300 ℃, and therefore, if the time period during which the exhaust gas temperature at the SCR inlet is higher than the first closed loop temperature is longer than the warning time period within 10 hours of the cumulative operation of the engine, it can be considered that the crystals accumulated in the SCR within the last 10 hours of the operation are very few, and the SCR treatment efficiency is hardly reduced or the related parts are hardly damaged, which may be referred to as a crystallization risk-free state of the SCR, and thus active removal of the crystals by increasing the exhaust gas temperature at the SCR inlet is not required.

In other words, if the SCR does not satisfy the condition in step S202 within the last 10 hours of the engine operation, it is considered that the SCR accumulates a certain amount of crystals, which may cause the treatment efficiency of the SCR to be significantly reduced or cause the related parts to be damaged, and this condition may be referred to as a low crystallization risk state of the SCR, so that the crystals need to be actively removed in a manner of increasing the exhaust gas temperature at the inlet of the SCR.

By the determination in step S202, heating of the exhaust gas at the SCR inlet can be avoided under unnecessary conditions, thereby reducing energy consumption as much as possible.

S203, executing a first thermal management strategy to regulate the temperature of the exhaust gas at the SCR inlet.

The first thermal management strategy is that the first closed loop temperature is used as a target temperature, the duration time is determined according to the early warning time and the accumulated high-temperature state time of the selective catalytic reduction reactor in the current first period, and then the exhaust gas temperature at the SCR inlet is adjusted based on the target temperature in the duration time.

The duration of the first thermal management policy may be determined by the following equation:

duration max (half of the warning duration, warning duration-cumulative duration)

The accumulated time length is the time length of the SCR accumulated in the high-temperature state in the current first period.

If the warning period is 0.5h (hours), the accumulated period is represented by Ti, and the duration of the first thermal management strategy is represented by Tx1, the above equation can be expressed as:

Tx1＝max(0.25h，0.5h-Ti)

the expression above means that the early warning duration is first subtracted from the accumulated duration to obtain a duration difference, and if the duration difference is greater than one half of the early warning duration, the duration difference is used as the duration of the first thermal management strategy, otherwise, if the duration difference is less than or equal to one half of the early warning duration, one half of the early warning duration is determined as the duration of the first thermal management strategy.

With reference to the foregoing first thermal management policy, the specific implementation procedure of step S203 may be:

and detecting whether the current exhaust gas temperature at the inlet of the selective catalytic reduction reactor is higher than the target temperature in real time within the duration.

And if the current exhaust gas temperature at the inlet of the selective catalytic reduction reactor is greater than or equal to the target temperature, controlling the heating equipment at the inlet of the selective catalytic reduction reactor to be in a closed state, namely not heating the exhaust gas at the inlet of the SCR.

And if the current exhaust gas temperature at the inlet of the selective catalytic reduction reactor is lower than the target temperature, controlling the heating equipment at the inlet of the selective catalytic reduction reactor to be in an open state, thereby heating the exhaust gas entering the selective catalytic reduction reactor.

By implementing the first thermal management strategy, the exhaust gas temperature at the inlet of the SCR can be controlled to be as close as possible to the first closed-loop temperature during the duration of the first thermal management strategy, and the first closed-loop temperature is higher than the lowest decomposition temperature of the crystals of the SCR, so that the crystals possibly existing in the SCR can be promoted to automatically decompose by implementing the first thermal management strategy, and the effect of clearing the crystals in the selective catalytic reduction reactor is achieved.

Optionally, after the execution of step S203 is completed, that is, the duration of the first thermal management policy is ended, the first successful information may be output, where the first successful information is used to indicate that the first thermal management policy is successfully executed.

S204, resetting the first timer.

Further, if a high temperature timer for recording the accumulated time length of the SCR in the high temperature state is set, step S204 further includes resetting the high temperature timer. The resetting method of the high temperature timer is consistent with the resetting method of the first timer, and is not described herein again.

After the first timer is reset, if the engine is in the running state, the process returns to step S201, and it is continuously detected whether the reading of the first timer is equal to the duration of the first period. If the engine is in the stopped state, the engine is started and then the process proceeds to step S201.

The application provides a method for clearing away reactor crystals, which comprises the steps of detecting whether the reading of a first timer is equal to the preset duration of a first period in real time when an engine runs; if the reading of the first timer is equal to the duration of the first period, judging whether the duration of the accumulated high-temperature state of the selective catalytic reduction reactor in the current first period is greater than the early warning duration, and the first closed-loop temperature is greater than the lowest decomposition temperature of the reactor crystals; if the judgment result is yes, continuously adjusting the temperature of the exhaust gas at the inlet of the selective catalytic reduction reactor based on the target temperature within a preset duration by taking the first closed-loop temperature as the target temperature; the first timer is reset and the reading of the first timer continues to be detected in real time. The scheme adjusts the temperature of the waste gas at the inlet of the selective catalytic reduction reactor to be higher than the lowest decomposition temperature of the crystals of the reactor, thereby promoting the decomposition of the crystals and achieving the effect of removing the crystals.

In view of the fact that the first closed loop temperature corresponding to the first thermal management strategy is low, the speed of clearing the crystals by executing the first thermal management strategy is low, and in the case that the crystals accumulated in the SCR are more (the amount of accumulated crystals is greater than that of crystals corresponding to the low crystallization risk state), this case may be referred to as the crystallization risk state of the SCR, and the crystals of the SCR may not be cleared in time by executing the first thermal management strategy.

Referring to fig. 3, a method for removing crystals according to a second embodiment of the present application includes the following steps:

s301, detecting whether the reading of the first timer is equal to the preset duration of the first period in real time when the engine runs.

If the reading of the first timer is equal to the preset duration of the first period, step S302 is executed, and if the reading of the first timer is less than the duration of the first period, step S301 is executed.

S302, judging whether the processing efficiency reduction rate in the current first period is larger than a preset reduction rate threshold value.

If the processing efficiency decrease rate in the current first cycle is not greater than the decrease rate threshold, that is, is less than or equal to the decrease rate threshold, step S304 is executed, and if the processing efficiency decrease rate in the current first cycle is greater than the decrease rate threshold, step S303 is executed.

The definition of the current first cycle is consistent with the definition in the first embodiment of the present application and refers to a first cycle of recent engine operation. Specifically, if the first period is set to 10 hours, step S302 is to determine whether the processing efficiency decrease rate after the engine operation is performed for 10 hours is lower than the decrease rate threshold.

The reduction rate of the processing efficiency may be represented by a difference obtained by subtracting the processing efficiency of the SCR at the end time of the current first period from the processing efficiency of the SCR at the start time of the current first period.

The processing efficiency of the SCR at the end of the current first cycle may be divided by the processing efficiency of the SCR at the start of the current first cycle, and the division may be subtracted from 1 to obtain the result as the processing efficiency reduction rate.

The treatment efficiency of the SCR at a certain time is used to characterize the SCR's ability to purify nitrogen oxides in the exhaust gas. Specifically, the processing efficiency Pt of the SCR at a certain time t can be represented by the following formula: pt is calculated as 1-Co/Ci.

Where Co is the concentration of nitrogen oxides in the exhaust gas at the SCR outlet at time t, and Ci is the concentration of nitrogen oxides in the exhaust gas at the SCR inlet at time t.

It can be found that, in the case where the concentration of nitrogen oxides in the exhaust gas at the SCR inlet is constant, the higher the treatment efficiency of SCR, the lower the concentration of nitrogen oxides in the exhaust gas at the SCR outlet, and the stronger the capability of SCR to purify nitrogen oxides in the exhaust gas.

Therefore, the equipment for detecting the concentration of the oxynitride in the gas is respectively arranged at the outlet and the inlet of the SCR, when the first timer is reset, the concentration of the oxynitride at the outlet and the inlet of the SCR is recorded once, the treatment efficiency of the SCR at the moment is calculated, when the reading of the first timer is equal to the time length of the first period, the treatment efficiency of the SCR at the moment is calculated again, and the treatment efficiency of the SCR at the moment is subtracted from the treatment efficiency of the SCR at the latest time when the first timer is reset, so that the treatment efficiency reduction rate of the current first period can be obtained.

The decrease rate threshold may be set according to actual conditions, and may be set to 20%, for example.

The degree of influence of the crystals in the SCR on the SCR treatment efficiency is proportional to the total mass of the crystals in the SCR, and the more the crystals are, the larger the total mass is, the higher the degree of influence of the crystals on the SCR treatment efficiency is, and the lower the SCR treatment efficiency is.

Therefore, if the processing efficiency decrease rate of the current first period is greater than the preset decrease rate threshold, it may be considered that a large amount of crystals may exist in the SCR at this time, and therefore, a second thermal management strategy with a faster crystal removal speed needs to be adopted for crystal removal.

S303, executing a second thermal management strategy to regulate the temperature of the exhaust gas at the SCR inlet.

The second thermal management strategy is to set the second closed loop temperature to a target temperature and determine a preset first heating duration as a duration during which the temperature of the exhaust gas at the inlet of the selective catalytic reduction reactor is continuously adjusted based on the target temperature. And the second closed loop temperature corresponding to the second thermal management strategy is higher than the first closed loop temperature corresponding to the first thermal management strategy.

Alternatively, the first heating time period may be set to 0.5h (hour), or may be set to other values according to practical situations, which is not limited in the present application.

For example, if the first closed loop temperature is set to 350 ℃, the second closed loop temperature may be set to 500 ℃.

The specific implementation process of step S303 is similar to the implementation process of the first thermal management strategy of step S203 in the first embodiment of the present application, that is, the temperature of the exhaust gas at the SCR inlet is detected in real time within the duration of the second thermal management strategy, if the temperature of the exhaust gas at the SCR inlet has reached (greater than or equal to) the target temperature, the exhaust gas at the SCR inlet is not heated, and if the temperature of the exhaust gas at the SCR inlet has not reached (less than) the target temperature, the heating device is started to heat the exhaust gas at the SCR inlet. In this way, the exhaust gas temperature at the SCR inlet may be brought as close as possible to the target temperature of the second thermal management strategy for the duration of the second thermal management strategy.

As previously described, the higher the temperature of the environment, the faster the rate of decomposition of the crystals produced by the reaction of urea and exhaust gases, and thus, by implementing a second thermal management strategy with a loop closing temperature higher than the first thermal management strategy, the present solution can quickly clear the crystals in the SCR if a large amount of crystals may be detected in the SCR.

After the execution of step S303 is completed, step S306 is directly executed.

Optionally, a second prompting message may be output after the execution of step S303 is finished, where the second prompting message is used to prompt that the execution of the second thermal management policy is successful.

S304, judging whether the accumulated time length of the SCR in the high-temperature state in the current first period is greater than the preset early warning time length.

If the time length of the SCR accumulated high temperature state in the current first period is longer than the preset early warning time length, step S306 is executed, otherwise, if the time length of the SCR accumulated high temperature state in the current first period is not longer than (i.e., is less than or equal to) the early warning time length, step S305 is executed.

It should be noted that the execution sequence of the two determinations described in step S302 and step S304 is not limited to the sequence described in the present embodiment, but may be arbitrarily replaced, and may also be executed simultaneously when the conditions allow.

When the processing efficiency reduction rate is greater than a preset reduction rate threshold value and the accumulated time of the SCR in the high-temperature state is not greater than the early warning time, only the second thermal management strategy can be executed without executing the first thermal management strategy, or the first thermal management strategy and the second thermal management strategy can also be executed in sequence.

S305, executing a first thermal management strategy to regulate the temperature of the exhaust gas at the SCR inlet.

S306, resetting the first timer.

After the first timer is reset, if the engine is in the running state, the process returns to step S201, and it is continuously detected whether the reading of the first timer is equal to the duration of the first period. If the engine is in the stopped state, the engine is started and then the process proceeds to step S201.

In the above steps, the specific execution process of steps S304 to S306 is the same as the specific execution process of steps S202 to S204 in the foregoing embodiment, and is not described herein again.

Referring to fig. 4, the present application further provides a method for detecting whether the SCR is in a high crystallization risk state, and executing a third thermal management strategy with a faster purge rate than the second thermal management strategy when the SCR is determined to be in the high crystallization risk state, so as to purge the crystallization of the reactor. The method may comprise the steps of:

s401, detecting whether the reading of the second timer is equal to the duration of a preset second period in real time when the engine runs.

Wherein the second timer is used for recording the accumulated running time of the engine.

The second timer operates in a similar manner to the first timer in the previous embodiment, and counts when the engine is running, retains the reading when the engine is off after the engine is off without resetting, and continues counting from the retained reading when the engine is restarted until the second timer is reset. After reset, the second timer reading is set to zero and then reset to 0 to continue timing while the engine is running.

If the reading of the second timer is equal to the preset duration of the second period, step S402 is executed, otherwise, if the reading of the second timer is less than the duration of the second period, step S401 is continuously executed.

The duration of the second period is greater than the duration of the first period, and optionally, the second period may be set to 50 hours. That is, the determination described in step S402 is made every 50 hours of engine operation.

S402, judging whether the particulate matter trap of the engine is regenerated in the current second period.

Wherein the current second period refers to a second period recorded by the second timer.

Assuming that the second period is set to 50 hours, the present second period here refers to 50 hours until the present engine is operated most recently, similarly to step S202 in the first embodiment.

If the DPF (i.e., the particulate trap) of the engine is not regenerated in the current second period, step S403 is performed, and if the DPF (i.e., the particulate trap) of the engine is regenerated at least once in the current second period, step S404 is performed.

Typically, regeneration of a DPF occurs when the temperature of the exhaust passing through the DPF is sufficiently high (typically greater than or equal to 300℃.), and the exhaust output from the DPF is the exhaust input to the SCR. Thus, if the DPF is not regenerated during the entire second period of past engine operation, it is believed that the temperature of the exhaust gas flowing into the SCR is continuously low during this period, which is a situation where there is a significant likelihood of large amounts of crystals accumulating in the SCR, i.e., the SCR is at a high risk of crystallization, and therefore a third thermal management strategy that provides a faster rate of purging is needed to purge the SCR of crystals.

And S403, executing a third thermal management strategy to regulate the exhaust gas temperature at the SCR inlet.

The second heating time period may be set to 0.5 hour, that is, 0.5 hour, or may be set to other values according to practical situations, which is not limited in the present application.

The third closed loop temperature is higher than the second closed loop temperature, and optionally, the third closed loop temperature may be set to 600 ℃.

The implementation of the third thermal management strategy is similar to the implementation of the first and second thermal management strategies described above, and each controls the switching of the heating device at the SCR inlet for an extended period of time to regulate the temperature of the exhaust gas at the SCR inlet to approach the target temperature for the third thermal management strategy.

The third closed loop temperature corresponding to the third thermal management strategy is higher than the second closed loop temperature, and therefore, the third thermal management strategy can be executed to clear crystallization in the SCR more quickly than the second thermal management strategy.

Optionally, after the execution of step S403 is finished, third prompt information may be output, where the third prompt information is used to prompt that the execution of the third thermal management policy is successful.

S404, resetting the second timer.

After the second timer is reset, the process returns to step S401.

Finally, it should be noted that the method provided in the third embodiment of the present application can be performed simultaneously with the method provided in the first embodiment or the second embodiment of the present application.

For example, the method of the third embodiment may be performed simultaneously with the method of the second embodiment. That is, the reading of the first timer and the reading of the second timer are detected simultaneously in the engine running state, and if the reading of the first timer is detected to be equal to the duration of the first period, the subsequent steps of the method provided by the second embodiment are performed, and if the reading of the second timer is detected to be equal to the duration of the second period, the subsequent steps of the method provided by the third embodiment are performed.

In this case, if the state of the SCR satisfies the execution conditions of multiple thermal management policies at the same time, only the thermal management policy with the highest corresponding closed-loop temperature may be executed, or each thermal management policy satisfying the execution conditions may be executed one by one. For example, if the state of the SCR at a certain time simultaneously satisfies the execution conditions of the first thermal management policy, the second thermal management policy, and the third thermal management policy, only the third thermal management policy may be executed, or the third thermal management policy, the second thermal management policy, and the first thermal management policy may be executed one by one.

Further, when the method in the third embodiment and the method in the second embodiment are executed simultaneously, after any one of the first thermal management policy, the second thermal management policy, and the third thermal management policy is successfully executed, the first timer and the high temperature timer are all reset, and the second timer is reset only after the third thermal management policy is successfully executed.

In combination with the method for removing reactor crystals provided in any embodiment of the present application, an embodiment of the present application further provides an apparatus for removing reactor crystals, please refer to fig. 5, which includes the following units:

the timing unit 501 is configured to detect whether a reading of the first timer is equal to a preset duration of the first period in real time when the engine is running.

The second timer is used for recording the accumulated running time of the engine.

The determining unit 502 is configured to determine whether a duration of the scr reactor accumulated in a high temperature state in the current first period is greater than a preset early warning duration if the reading of the first timer is equal to the duration of the preset first period.

Wherein the current first period refers to a first period recorded by the first timer; the high-temperature state refers to a state in which the temperature of the exhaust gas at the inlet of the selective catalytic reduction reactor is greater than or equal to a preset first closed-loop temperature; the first ring-closure temperature is greater than the lowest decomposition temperature of the reactor crystals.

The execution unit 503 is configured to execute a first thermal management strategy if a duration of the cumulative high-temperature state of the selective catalytic reduction reactor in the first period is less than or equal to the early warning duration.

The first thermal management strategy is to continuously adjust the temperature of the exhaust gas at the inlet of the selective catalytic reduction reactor based on a target temperature within a preset duration by taking the first closed-loop temperature as the target temperature; the duration is determined according to the early warning duration and the duration of the accumulated high-temperature state of the selective catalytic reduction reactor in the current first period.

And the timing unit 501 is used for resetting the first timer and returning to the execution of real-time detection whether the reading of the first timer is equal to the preset duration of the first period when the engine runs.

The determining unit 502 is further configured to:

and judging whether the processing efficiency reduction rate of the selective catalytic reduction reactor in the current first period is greater than a preset reduction rate threshold value.

The execution unit 503 is further configured to: and if the processing efficiency reduction rate of the selective catalytic reduction reactor in the current first period is greater than the reduction rate threshold value, executing a second thermal management strategy.

And the second thermal management strategy is to take the second closed-loop temperature as a target temperature and a preset first heating time as a duration, and continuously adjust the temperature of the exhaust gas at the inlet of the selective catalytic reduction reactor based on the target temperature in the duration.

Wherein the second closed loop temperature is greater than the first closed loop temperature.

The determining unit 502 determines whether the accumulated high-temperature time of the selective catalytic reduction reactor in the first period is longer than a preset early warning time, and is specifically configured to:

if the processing efficiency reduction rate of the selective catalytic reduction reactor in the current first period is smaller than or equal to the reduction rate threshold, judging whether the accumulated high-temperature-state duration of the selective catalytic reduction reactor in the current first period is larger than a preset early warning duration.

The timing unit 501 is further configured to:

and detecting whether the reading of the second timer is equal to the preset duration of the second period in real time when the engine runs.

The second timer is used for recording the accumulated running time of the engine.

The determining unit 502 is further configured to determine whether the particulate matter trap of the engine is regenerated during the second period if the reading of the second timer is equal to the duration of the second period.

Wherein the current second period refers to a second period recorded by the second timer.

The execution unit 503 is further configured to execute a third thermal management strategy if the particulate matter trap of the engine is not regenerated during the current second period.

The third thermal management strategy is to continuously adjust the temperature of the exhaust gas at the inlet of the selective catalytic reduction reactor based on a preset third closed-loop temperature as a target temperature and a preset second heating time as a duration, wherein the duration is based on the target temperature; the third closed loop temperature is greater than the second closed loop temperature.

The timing unit 501 is further configured to reset the second timer after the third thermal management strategy is successfully executed, and return to the execution of detecting whether the reading of the second timer is equal to the duration of the preset second period when the engine runs.

The execution unit 503, when continuously adjusting the exhaust gas temperature at the inlet of the selective catalytic reduction reactor for a duration based on the target temperature, is specifically configured to:

detecting whether the current exhaust gas temperature at the inlet of the selective catalytic reduction reactor is lower than a target temperature in real time within a preset duration;

if the current exhaust gas temperature at the inlet of the selective catalytic reduction reactor is greater than or equal to the target temperature, controlling the heating equipment at the inlet of the selective catalytic reduction reactor to be in a closed state;

and if the current exhaust gas temperature at the inlet of the selective catalytic reduction reactor is lower than the target temperature, controlling the heating equipment at the inlet of the selective catalytic reduction reactor to be in an open state, thereby heating the exhaust gas entering the selective catalytic reduction reactor.

It should be noted that, after any one of the three thermal management policies (i.e., the first thermal management policy, the second thermal management policy, and the third thermal management policy) is successfully executed, the timing unit 501 resets the first timer, and if a high-temperature timer is set, after any one of the thermal management policies is successfully executed, the timing unit 501 also resets the high-temperature timer, but the timing unit 501 only resets the second timer after the third thermal management policy is successfully executed.

For the apparatus for removing the crystals from the reactor provided in the embodiments of the present application, specific working principles thereof may refer to the method for removing the crystals provided in any embodiment of the present application, and details thereof are not repeated herein.

The application provides a device for clearing reactor crystals.A timing unit 501 detects whether the reading of a first timer is equal to the duration of a preset first period in real time when an engine runs; if the reading of the first timer is equal to the duration of the first period, the determining unit 502 determines whether the duration of the accumulated high temperature state of the selective catalytic reduction reactor in the current first period is longer than the early warning duration, and the first closed-loop temperature is greater than the lowest decomposition temperature of the reactor crystal; if the result of the determination is yes, the execution unit 503 continuously adjusts the temperature of the exhaust gas at the inlet of the selective catalytic reduction reactor based on the target temperature within the preset duration with the first closed-loop temperature as the target temperature; the first timer is reset and the reading of the first timer continues to be detected in real time. The scheme adjusts the temperature of the waste gas at the inlet of the selective catalytic reduction reactor to be higher than the lowest decomposition temperature of the crystals of the reactor, thereby promoting the decomposition of the crystals and achieving the effect of removing the crystals.

Referring to fig. 6, an electronic device according to an embodiment of the present application includes a memory 601 and a processor 601.

The memory 601 is used for storing a computer program, and the processor 602 is used for executing the computer program, when the computer program is executed, the computer program is specifically used for implementing the method for clearing reactor crystallization provided by any embodiment of the application.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

It should be noted that the terms "first", "second", and the like in the present invention are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence relationship of the functions performed by the devices, modules or units.

Those skilled in the art can make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. A method of purging a reactor of crystals, comprising:

detecting whether the reading of the first timer is equal to the preset duration of the first period in real time when the engine runs; the first timer is used for recording the accumulated running time of the engine;

if the reading of the first timer is equal to the preset first period of time, judging whether the accumulated high-temperature-state time of the selective catalytic reduction reactor in the current first period is longer than the preset early warning time; wherein the current first period refers to a first period recorded by the first timer; the high temperature state refers to a state in which the temperature of the exhaust gas at the inlet of the selective catalytic reduction reactor is greater than or equal to a preset first closed loop temperature; the first loop closure temperature is greater than a minimum decomposition temperature of crystallization of the selective catalytic reduction reactor;

if the accumulated high-temperature state duration of the selective catalytic reduction reactor in the current first period is less than or equal to the early warning duration, executing a first thermal management strategy; wherein the first thermal management strategy is to continuously adjust the exhaust gas temperature at the inlet of the selective catalytic reduction reactor based on a first closed loop temperature as a target temperature for a preset duration; the duration is determined according to the early warning duration and the duration of the accumulated high-temperature state of the selective catalytic reduction reactor in the current first period;

resetting the first timer and returning to the execution of the real-time detection of whether the reading of the first timer is equal to the preset duration of the first period when the engine runs;

before judging whether the accumulated high-temperature state duration of the selective catalytic reduction reactor in the current first period is greater than a preset early warning duration, the method further comprises the following steps:

judging whether the processing efficiency reduction rate of the selective catalytic reduction reactor in the current first period is greater than a preset reduction rate threshold value or not;

if the processing efficiency reduction rate of the selective catalytic reduction reactor in the current first period is larger than the reduction rate threshold value, executing a second thermal management strategy; wherein the second thermal management strategy is to continuously adjust the exhaust gas temperature at the inlet of the selective catalytic reduction reactor based on a second closed loop temperature as a target temperature and a preset first heating time period as a duration time period; wherein the second closed loop temperature is greater than the first closed loop temperature;

wherein the judging whether the accumulated high-temperature state duration of the selective catalytic reduction reactor in the current first period is greater than a preset early warning duration comprises:

if the processing efficiency reduction rate of the selective catalytic reduction reactor in the current first period is smaller than or equal to the reduction rate threshold, judging whether the accumulated high-temperature-state duration of the selective catalytic reduction reactor in the current first period is larger than a preset early warning duration;

the method further comprises the following steps:

detecting whether the reading of the second timer is equal to the preset duration of the second period in real time when the engine runs; the second timer is used for recording the accumulated running time of the engine;

if the reading of the second timer is equal to the duration of the second period, judging whether the particulate matter trap of the engine is regenerated in the current second period; wherein the current second period refers to a second period recorded by the second timer;

if the particulate matter trap of the engine is not regenerated in the current second period, executing a third thermal management strategy; wherein the third thermal management strategy is to continuously adjust the exhaust gas temperature at the inlet of the selective catalytic reduction reactor based on a preset third closed-loop temperature as a target temperature and a preset second heating time as a duration, and the duration is based on the target temperature; the third closed-loop temperature is greater than the second closed-loop temperature;

and after the third thermal management strategy is successfully executed, resetting the second timer, and returning to execute the real-time detection of whether the reading of the second timer is equal to the preset second period when the engine runs.

2. The method of claim 1, wherein the first closed loop temperature is 350 ℃, the second closed loop temperature is 500 ℃, and the third closed loop temperature is 600 ℃.

3. The method of any one of claims 1-2, wherein continuously adjusting the temperature of the exhaust gas at the inlet of the selective catalytic reduction reactor based on a target temperature for a duration comprises:

detecting whether the current exhaust gas temperature at the inlet of the selective catalytic reduction reactor is lower than a target temperature in real time within a preset duration;

if the current exhaust gas temperature at the inlet of the selective catalytic reduction reactor is greater than or equal to the target temperature, controlling the heating equipment at the inlet of the selective catalytic reduction reactor to be in a closed state;

and if the current exhaust gas temperature at the inlet of the selective catalytic reduction reactor is lower than the target temperature, controlling the heating equipment at the inlet of the selective catalytic reduction reactor to be in an open state, so as to heat the exhaust gas entering the selective catalytic reduction reactor.

4. An apparatus for removing crystals from a reactor, comprising:

the timing unit is used for detecting whether the reading of the first timer is equal to the preset duration of the first period in real time when the engine runs; the second timer is used for recording the accumulated running time of the engine;

the judging unit is used for judging whether the accumulated high-temperature-state time of the selective catalytic reduction reactor in the current first period is longer than the preset early warning time if the reading of the first timer is equal to the preset first period time; wherein the current first period refers to a first period recorded by the first timer; the high temperature state refers to a state in which the temperature of the exhaust gas at the inlet of the selective catalytic reduction reactor is greater than or equal to a preset first closed loop temperature; the first loop closure temperature is greater than a minimum decomposition temperature of crystallization of the selective catalytic reduction reactor;

the execution unit is used for executing a first thermal management strategy if the accumulated high-temperature state duration of the selective catalytic reduction reactor in the current first period is less than or equal to the early warning duration; wherein the first thermal management strategy is to continuously adjust the exhaust gas temperature at the inlet of the selective catalytic reduction reactor based on a first closed loop temperature as a target temperature for a preset duration; the duration is determined according to the early warning duration and the duration of the accumulated high-temperature state of the selective catalytic reduction reactor in the current first period;

the timing unit is used for resetting the first timer and returning to the execution of the real-time detection of whether the reading of the first timer is equal to the preset duration of the first period when the engine runs;

wherein the judging unit is further configured to:

judging whether the processing efficiency reduction rate of the selective catalytic reduction reactor in the current first period is greater than a preset reduction rate threshold value or not;

the execution unit is further to: if the processing efficiency reduction rate of the selective catalytic reduction reactor in the current first period is larger than the reduction rate threshold value, executing a second thermal management strategy; wherein the second thermal management strategy is to continuously adjust the exhaust gas temperature at the inlet of the selective catalytic reduction reactor based on a second closed loop temperature as a target temperature and a preset first heating time period as a duration time period; wherein the second closed loop temperature is greater than the first closed loop temperature;

the judging unit is used for judging whether the accumulated high-temperature state duration of the selective catalytic reduction reactor in the current first period is longer than a preset early warning duration, and is specifically used for:

if the processing efficiency reduction rate of the selective catalytic reduction reactor in the current first period is smaller than or equal to the reduction rate threshold, judging whether the accumulated high-temperature-state duration of the selective catalytic reduction reactor in the current first period is larger than a preset early warning duration;

wherein the timing unit is further configured to:

detecting whether the reading of the second timer is equal to the duration of a preset second period in real time when the engine runs; the second timer is used for recording the accumulated running time of the engine;

the judging unit is further used for judging whether the particulate matter trap of the engine is regenerated in the current second period or not if the reading of the second timer is equal to the duration of the second period; wherein the current second period refers to a second period recorded by the second timer;

the execution unit is further used for executing a third thermal management strategy if the particulate matter trap of the engine is not regenerated in the current second period; wherein the third thermal management strategy is to continuously adjust the exhaust gas temperature at the inlet of the selective catalytic reduction reactor based on a preset third closed-loop temperature as a target temperature and a preset second heating time as a duration, and the duration is based on the target temperature; the third closed-loop temperature is greater than the second closed-loop temperature;

and the timing unit is further used for resetting the second timer after the third thermal management strategy is successfully executed, and returning to the step of detecting whether the reading of the second timer is equal to the duration of a preset second period in real time when the engine runs.

5. The apparatus of claim 4, wherein the execution unit, while continuously adjusting the exhaust gas temperature at the inlet of the selective catalytic reduction reactor based on the target temperature for the duration, is specifically configured to:

detecting whether the current exhaust gas temperature at the inlet of the selective catalytic reduction reactor is lower than a target temperature in real time within a preset duration;

if the current exhaust gas temperature at the inlet of the selective catalytic reduction reactor is greater than or equal to the target temperature, controlling the heating equipment at the inlet of the selective catalytic reduction reactor to be in a closed state;

and if the current exhaust gas temperature at the inlet of the selective catalytic reduction reactor is lower than the target temperature, controlling the heating equipment at the inlet of the selective catalytic reduction reactor to be in an open state, so as to heat the exhaust gas entering the selective catalytic reduction reactor.

6. An electronic device comprising a memory and a processor;

wherein the memory is used for storing programs;

the processor is adapted to execute the program, which when executed is adapted to implement the method of clearing reactor crystals as claimed in any one of claims 1 to 3.

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