CN109944706B - Method and device for regulating and controlling nitrogen oxide emission - Google Patents
Method and device for regulating and controlling nitrogen oxide emission Download PDFInfo
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Abstract
The invention provides a method for regulating and controlling nitrogen oxide emission, which comprises the steps of obtaining various operation parameters corresponding to an engine, obtaining a detection value of the nitrogen oxide, the rotating speed of the engine and the circulating oil supply amount of the engine under a detection state when the various operation parameters meet preset detection operation conditions, and determining the current corresponding detection state of the engine according to the detection value of the nitrogen oxide, the rotating speed of the engine and the circulating oil supply amount of the engine; determining a deviation value of a detection value of the oxynitride and a preset oxynitride model value; and comparing the deviation value with a preset deviation threshold value, and selecting corresponding regulation measures according to the result obtained by comparison and the detection state so as to control the discharge amount of the oxynitride. By applying the method provided by the invention, the nitrogen oxide discharged by the engine is controlled within a reasonable range by regulating and controlling the parameters of the engine.
Description
Technical Field
The invention relates to the technical field of tail gas emission control, in particular to a method and a device for regulating and controlling nitrogen oxide emission.
Background
With the social progress and economic development, the engine is applied to various fields, mainly applied to the motor vehicle and provides driving energy for the motor vehicle. The engine releases energy mainly by burning diesel oil, and when the engine releases energy by burning diesel oil, the exhaust gas discharged by the engine causes great harm to the environment and human bodies. The exhaust gas emitted by the engine mainly comprises Nitric Oxide (NO), Hydrocarbon (HC), oxynitride (NOx) and the like, the oxynitride and the hydrocarbon can generate chemical reaction to generate harmful substances, and the oxynitride can form acid rain after entering the atmosphere, thereby seriously harming the ecological environment.
At present, all countries in the world increasingly pay attention to the problem of emission of engine exhaust gas, and a method for controlling the emission of the engine exhaust gas is developed for controlling the emission of pollutants in the exhaust gas emitted by the engine.
Disclosure of Invention
In view of this, the embodiments of the present invention provide a method for regulating and controlling an emission of an oxynitride, which can regulate and control an oxynitride emitted from an engine, so that the emitted oxynitride is within a reasonable emission range.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a method for regulating and controlling nitrogen oxide emission comprises the following steps:
when the preset enabling conditions are met, in the current detection period, acquiring various operating parameters corresponding to the engine in the operation process of the engine, and judging whether the various operating parameters meet the preset detection operating conditions or not;
when all the operation parameters meet the preset detection operation condition, acquiring a detection value of the oxynitride in the detection state, the rotating speed of the engine and the circulating oil supply quantity of the engine;
determining a current corresponding detection state of the engine according to the detection value of the oxynitride, the rotating speed of the engine and the circulating oil supply amount of the engine;
determining a deviation value of the detection value of the oxynitride and a preset oxynitride model value;
comparing the deviation value with a preset deviation threshold value to obtain a comparison result;
and selecting corresponding regulation and control measures according to the comparison result and the detection state so as to control the discharge amount of the oxynitride.
Optionally, in the method, the preset detection operating condition includes a plurality of operating sub-conditions, and the determining whether each of the operating parameters meets the preset detection operating condition includes:
determining operation sub-conditions corresponding to the operation parameters respectively;
judging whether each operation parameter meets the corresponding operation sub-condition;
and when each operation parameter meets the corresponding operation sub-condition, judging that each operation parameter meets the preset detection operation condition.
The above method, optionally, the determining a current corresponding detection state of the engine according to the detected value of the oxynitride, the rotation speed of the engine, and the amount of circulating oil supply of the engine includes:
judging whether the rotating speed of the engine is within a preset rotating speed threshold interval, whether the circulating oil supply amount of the engine is within a preset circulating oil supply amount threshold interval, and whether the detection value of the oxynitride of the engine is within a preset oxynitride threshold interval;
when the rotating speed of the engine is within the preset rotating speed threshold interval, the circulating oil supply amount of the engine is within the preset circulating oil supply amount threshold interval, and the detection value of the oxynitride of the engine is within the preset oxynitride threshold interval, judging that the current corresponding detection state of the engine is a steady state, otherwise, judging that the current corresponding detection state of the engine is a transient state.
Optionally, in the above method, when the current corresponding detection state of the engine is a steady state, selecting a corresponding control measure according to the comparison result and the detection state to control the emission of nox includes:
judging whether the detection value of the oxynitride output by the engine meets a preset output standard value in the current detection period according to the comparison result;
and when the detection value of the oxynitride is larger than the preset output standard value, calling a preset steady-state control correction strategy, and adjusting a preset regulation and control parameter corresponding to the engine to control the emission of the oxynitride by the engine.
Optionally, in the above method, when the current corresponding detection state of the engine is a transient state, selecting a corresponding control measure according to the comparison result and the detection state to control the emission of nox includes:
judging whether the detection value of the oxynitride output by the engine meets a preset output standard value in the current detection period or not according to the comparison result;
and when the detection value of the oxynitride is larger than the preset output standard value, calling a preset transient control correction strategy, and adjusting a preset regulation and control parameter corresponding to the engine to control the emission of the oxynitride by the engine.
A regulating device for nox emissions, comprising:
the judging unit is used for acquiring various running parameters corresponding to the engine in the running process of the engine in the current detection period when the preset enabling condition is met, and judging whether the various running parameters meet the preset detection running condition;
the acquisition unit is used for acquiring a detection value of the oxynitride in the detection state, the rotating speed of the engine and the circulating oil supply amount of the engine when all the operation parameters meet the preset detection operation conditions;
the first determining unit is used for determining a current corresponding detection state of the engine according to the detection value of the oxynitride, the rotating speed of the engine and the circulating oil supply amount of the engine;
a second determination unit, configured to determine a deviation value between the detected value of the oxynitride and a preset oxynitride model value;
the comparison unit is used for comparing the deviation value with a preset deviation threshold value to obtain a comparison result;
and the regulating unit is used for selecting corresponding regulating measures according to the comparison result and the detection state so as to control the discharge amount of the oxynitride.
The above apparatus, optionally, the determining unit includes:
a determining subunit, configured to determine respective corresponding operation sub-conditions of the operation parameters;
and the first judgment subunit is used for judging whether each operation parameter meets the corresponding operation sub-condition, and when each operation parameter meets the corresponding operation sub-condition, judging that each operation parameter meets the preset detection operation condition.
The above apparatus, optionally, the first determining unit includes:
the second judging subunit is used for judging whether the rotating speed of the engine is within a preset rotating speed threshold interval, whether the circulating oil supply amount of the engine is within a preset circulating oil supply amount threshold interval, and whether the detection value of the oxynitride of the engine is within a preset oxynitride threshold interval;
and the judging subunit is used for judging that the current corresponding detection state of the engine is a steady state when the rotating speed of the engine is within the preset rotating speed threshold interval, the circulating oil supply amount of the engine is within the preset circulating oil supply amount threshold interval, and the detection value of oxynitride of the engine is within the preset oxynitride threshold interval, or judging that the current corresponding detection state of the engine is a transient state.
The above device, optionally, the regulating unit includes:
the first selection subunit is used for judging whether the detection value of the oxynitride output by the engine meets a preset output standard value in the current detection period according to the comparison result; and when the detection value of the oxynitride is larger than the preset output standard value, calling a preset steady-state control correction strategy, and adjusting a preset regulation and control parameter corresponding to the engine to control the emission of the oxynitride by the engine.
Optionally, the above apparatus, wherein the regulating unit includes:
the second selection subunit is used for judging whether the detection value of the oxynitride output by the engine meets a preset output standard value in the current detection period according to the comparison result; and when the detection value of the oxynitride is larger than the preset output standard value, calling a preset transient control correction strategy, and adjusting a preset regulation and control parameter corresponding to the engine to control the emission of the oxynitride by the engine.
The method provided by the embodiment of the invention has the following advantages:
according to the method provided by the embodiment of the invention, various running parameters corresponding to the engine are obtained, when the running parameters meet preset detection running conditions, the detection value of the oxynitride in a detection state, the rotating speed of the engine and the circulating oil supply amount of the engine are obtained, and the current corresponding detection state of the engine is determined according to the detection value of the oxynitride, the rotating speed of the engine and the circulating oil supply amount of the engine; determining a deviation value of a detection value of the oxynitride and a preset oxynitride model value; and comparing the deviation value with a preset deviation threshold value, and selecting corresponding regulation measures according to the result obtained by comparison and the detection state so as to control the discharge amount of the oxynitride. By adopting the method provided by the invention, the nitrogen oxide discharged by the engine is controlled within a reasonable range by regulating and controlling the parameters of the engine, the closed-loop regulation and control of the discharge of the nitrogen oxide are realized, and the pressure of the post-treated converted nitrogen oxide is effectively reduced.
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 flowchart of a method for regulating nox emission according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for regulating NOx emission according to an embodiment of the present invention;
FIG. 3 is a flow chart of another method for regulating NOx emissions according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating another method for regulating NOx emissions according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating another method for regulating NOx emissions according to an embodiment of the present invention;
FIG. 6 is a structural diagram of an apparatus for regulating and controlling NOx emissions according to an embodiment of the present invention;
fig. 7 is a structural diagram of an apparatus for regulating and controlling nox emission according to an embodiment of the present invention.
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.
In this application, 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 the process, method, article, or apparatus that comprises the element.
The invention can be applied to a plurality of general or special exhaust emission control systems, for example, the invention can be applied to automobile exhaust emission control systems, or various exhaust systems which need to control the emission of certain elements in the exhaust gas within a reasonable range.
The embodiment of the invention provides a method for regulating and controlling nitrogen oxide emission, which can be applied to an engine with a nitrogen oxide sensor, wherein the execution subject of the method is a controller in an engine control system or a processor in the engine control system, and the controller or the processor can be arranged together with the engine, and a flow chart of the method is shown in fig. 1, and specifically comprises the following steps:
s101, when a preset enabling condition is met, in a current detection period, acquiring various operation parameters corresponding to an engine in the operation process of the engine, and judging whether the various operation parameters meet the preset detection operation condition.
In the method provided by the embodiment of the present invention, in the engine control system, when the preset enabling condition in the engine control system is met, the method provided by the embodiment of the present invention may be executed, which is a premise for executing the method provided by the embodiment of the present invention, and the enabling condition may be a level signal, for example, when the level is changed from a low level to a high level, the preset enabling condition is met; in the current detection period, acquiring various corresponding operating parameters of the engine in the operating process; it should be noted that the detection period may be set according to actual conditions, and the period may be set in units of hours, minutes, etc., for example, if a detection period is set to 15 minutes, the detection time lasts 15 minutes, and the interval between the detection periods may be set according to actual conditions, for example, the interval between the detection period 1 and the detection period 2 may be 5 hours; the operating parameters corresponding to the engine may include index parameters of the engine during operation, such as water temperature of the engine, exhaust pressure of the engine, and the like, and also include extrinsic parameters, such as temperature of an environment in which the engine is located, humidity of the environment, and the like; and judging whether the acquired operation parameters meet corresponding preset detection operation conditions.
S102, when all the operation parameters meet the preset detection operation conditions, acquiring a detection value of the oxynitride in the detection state, the rotating speed of the engine and the circulating oil supply amount of the engine.
In the method provided by the embodiment of the invention, when all the operating parameters meet the preset detection operating conditions, the rotating speed, the circulating oil supply amount and the nitrogen oxide detection value of the engine in the current detection period are obtained, and the obtained rotating speed and the circulating oil supply amount of the engine can be obtained by detection of preset engine detection equipment in the engine or can be obtained by a preset corresponding sensor; the detection value of the oxynitride is detected by an oxynitride sensor preset at the exhaust gas of the engine, and it should be noted that various operating parameters of the engine can be detected by corresponding sensors or by a preset detection module.
S103, determining a current corresponding detection state of the engine according to the detection value of the oxynitride, the rotating speed of the engine and the circulating oil supply amount of the engine.
In the method provided by the embodiment of the invention, the current corresponding detection state of the engine is determined according to the detection value of the oxynitride, the rotating speed of the engine and the circulating oil supply amount of the engine, wherein the detection state is divided into a steady state and a transient state, and the process of determining the detection state is to compare the detection value of the oxynitride, the rotating speed of the engine and the circulating oil supply amount of the engine with the corresponding preset threshold intervals respectively so as to judge the current corresponding detection state of the engine.
And S104, determining a deviation value between the detection value of the oxynitride and a preset oxynitride model value.
In the method provided by the embodiment of the invention, a preset nitrogen oxide sensor is used for detecting in a current detection period to obtain an actual nitrogen oxide detection value, and a preset nitrogen oxide model value in a preset simulated nitrogen oxide sensor is obtained, so that the nitrogen oxide detection value and the nitrogen oxide model value are calculated according to a preset algorithm to determine a deviation value between the nitrogen oxide detection value and the nitrogen oxide model value; for example, the calculated deviation value of the oxynitride from the oxynitride may be ± 3.
And S105, comparing the deviation value with a preset deviation threshold value to obtain a comparison result.
In the method provided by the embodiment of the present invention, the deviation value calculated in step S104 is compared with a preset deviation threshold value to determine whether the discharged oxynitrides are within a reasonable range, where the preset deviation threshold value may be an interval threshold value or a specific numerical value; when the preset deviation threshold is an interval threshold, when the deviation value is not within a preset deviation threshold range, the actual emission of the oxynitride is unreasonable, and when the deviation value is within the preset deviation threshold range, the actual emission of the oxynitride is reasonable, for example, the preset deviation threshold is ± 3, and when the calculated deviation threshold is ± 4, the actual emission of the oxynitride is unreasonable; when the preset deviation threshold is a specific numerical value, when the deviation value is greater than the preset deviation threshold, the result obtained by comparison is that the actually discharged oxynitride is unreasonable, and when the deviation value is less than the preset deviation threshold, the result obtained by comparison is that the actually discharged oxynitride is reasonable, for example, the preset deviation threshold is 5%, the calculated deviation threshold is 3%, and the actually discharged oxynitride is reasonable; it should be noted that the numerical type of the preset deviation threshold is the same as the numerical type of the calculated deviation value, and when the deviation value between the detected value of the nitrogen oxide compound and the model value of the nitrogen oxide compound is calculated, different numerical types correspond to different calculation methods.
S106, selecting corresponding regulation and control measures according to the comparison result and the detection state to control the discharge amount of the oxynitride.
In the method provided by the embodiment of the invention, the current corresponding control state of the engine is output according to the current corresponding detection state of the engine obtained in S103 and the comparison result in S105, and corresponding regulation and control measures are selected according to the control state to control the discharge amount of oxynitride; it should be noted that the current corresponding control states of the engine can be divided into three states, namely current control in a reasonable range, unreasonable steady-state control and unreasonable transient control; the current control is in a reasonable range, which is the case that the comparison result is that the actually discharged oxynitride is reasonable; the condition that the corresponding detection state of the engine is a steady state and the result obtained by comparison is that the actually discharged nitrogen oxide is unreasonable; the condition that the transient control is unreasonable is that the current corresponding detection state of the engine is transient, and the result obtained by comparison is that the actually discharged nitrogen oxide is unreasonable; corresponding regulation and control measures are selected according to different control states, and then the emission of the oxynitride of the engine is controlled, so that the oxynitride emitted by the engine is in a reasonable range.
In the method provided by the embodiment of the invention, when a preset enabling condition is met, in a current detection period, various operation parameters corresponding to an engine in the operation process of the engine are obtained, whether the various operation parameters meet the preset detection operation condition or not is judged, when the various parameters meet the preset detection operation condition, a detection value of a nitrogen oxide compound in a detection state, the rotating speed of the engine and the circulating oil supply quantity of the engine are obtained, and according to the detection value of the nitrogen oxide compound, the rotating speed of the engine and the circulating oil supply quantity of the engine, the current corresponding detection state of the engine and a deviation value between the detection value of the nitrogen oxide compound and a preset nitrogen oxide compound model value are determined; comparing the deviation value with a preset deviation threshold value to obtain a comparison result; and selecting corresponding regulation and control measures according to the comparison result and the detection state so as to control the discharge amount of the oxynitride.
By applying the method provided by the embodiment of the invention, when various parameters of the engine meet respective corresponding preset conditions, the current corresponding detection state of the engine and the deviation value of the detection value and the model value of the oxynitride are determined, the deviation value is compared with a preset deviation threshold value to obtain a comparison result, and corresponding regulation and control measures are selected according to the comparison result and the current corresponding detection state of the engine to regulate and control the oxynitride discharged by the engine within a reasonable range; the primary emission is nitrogen oxide emitted from an engine, and the post-treatment is a treatment process of converting the nitrogen oxide emitted from the engine at a tail gas pipe through treatment of a reducing agent; by applying the method provided by the embodiment of the invention, the nitrogen oxide discharged by the engine can be controlled within a reasonable range, the conversion pressure of aftertreatment is reduced, and the closed-loop regulation of the discharge of the nitrogen oxide is realized by regulating and controlling the parameters of the engine.
In the method provided by the embodiment of the present invention, when the method provided by the embodiment of the present invention is applied, it is required to determine whether each operating parameter of the engine meets a preset detection operating condition, and a specific process of the determination is as follows:
determining operation sub-conditions corresponding to the operation parameters respectively;
in the method provided by the implementation of the invention, after obtaining each operation parameter, the operation sub-condition corresponding to each operation condition is determined, and the operation sub-condition is the standard for judging whether the operation parameter meets the condition.
Judging whether each operation parameter meets the corresponding operation sub-condition;
in the method provided by the embodiment of the invention, each operation parameter is respectively compared or matched with the corresponding operation sub-condition, so that whether the operation parameter meets the condition is judged.
When each operation parameter meets the corresponding operation sub-condition, judging that each operation parameter meets the preset detection operation condition;
in the method provided by the embodiment of the invention, when each operation parameter meets the corresponding operation sub-condition, each operation parameter is judged to meet the preset detection operation condition, the current corresponding detection state of the engine, the detection value of the oxynitride and the deviation value of the model value can be judged, and the corresponding regulation and control measure is selected according to the current corresponding detection state of the engine and the comparison result of the deviation value and the preset deviation threshold value.
By judging the detection operation conditions of various operation parameters, an effective detection operation range is provided, and the accuracy of the detection state corresponding to the subsequent judgment engine, the detection value of the oxynitride and the deviation value of the model value is ensured.
The specific judgment process of each operating parameter can refer to fig. 2, which is described in detail as follows:
s201, various operation detection parameters corresponding to the operated engine are obtained.
In the method provided by the embodiment of the invention, a controller acquires various operating parameters corresponding to an operating engine through various sensors or preset detection modules, wherein the various operating parameters comprise external environment parameters, for example, the operating parameter a is the ambient temperature; the method also comprises the operation parameters of the engine, such as the operation parameter b is the temperature of the engine water, the operation parameter c is the temperature of the intake manifold, the operation parameter d is the operation mode of the engine, and the like.
S202, determining whether each operation parameter meets the judgment result of the corresponding operation sub-condition.
In the method provided by the embodiment of the invention, when the operation parameter meets the corresponding operation sub-condition, the bit value corresponding to the operation parameter is 1; when the operation parameter does not accord with the corresponding operation sub-condition, the bit value corresponding to the operation parameter is 0; it should be noted that, the bit value corresponding to the operating parameter represents whether the operating parameter meets the operating sub-condition corresponding to the operating parameter; for example, if the operation sub-condition corresponding to the environmental temperature is the calibrated environmental temperature threshold of 25-40 ℃, and the environmental temperature is 30 ℃, the operation sub-condition is met, and the bit value corresponding to the environmental temperature is 1; the water temperature of the engine is 58 ℃, the operation sub-condition corresponding to the water temperature of the engine is 35-55 ℃, if the water temperature of the engine does not meet the operation sub-condition, the value of the bit corresponding to the water temperature of the engine is 0; it should be noted that, during the determination, the operation parameters may be determined one by one, or may be determined simultaneously.
S203, judging whether all the operation parameters meet the corresponding operation sub-conditions.
In the method provided by the embodiment of the invention, the controller judges whether the operation parameters meet the corresponding operation sub-conditions according to the bit values corresponding to the operation parameters, and when the bit values corresponding to the operation parameters are all 1, all the operation parameters are judged to meet the corresponding operation sub-conditions, and a numerical value 1 representing the judgment result is output; when one of the operation parameters does not meet the corresponding operation sub-condition, judging that the operation parameters do not meet the corresponding operation sub-condition, and outputting a value 0 representing a judgment result; for example, there are 5 operation parameters, and the bit values corresponding to the received operation parameters are: 11111, indicating that the current 5 operation parameters all accord with the corresponding operation sub-conditions, judging that all the operation parameters accord with the corresponding operation sub-conditions, and outputting a value representing a judgment result as 1; when the bit value corresponding to the received operation parameter is: 10111, it is determined that the operation parameters do not all meet the corresponding operation sub-conditions, and the value representing the determination result is output as 0.
And S204, determining the working state of the oxynitride sensor.
In the method provided by the embodiment of the invention, when the working state of the oxynitride sensor is an effective state, and when the working state is the effective state, a value 1 representing the effective state is input into a controller; and when the working state is an invalid state, inputting a numerical value 0 representing that the state is invalid into the controller.
And S205, acquiring the rotating speed of the engine, the circulating oil supply amount of the engine and the detected value of the nitrogen oxide compound to determine the current corresponding detected state of the engine.
In the method provided by the embodiment of the present invention, when the rotation speed of the engine, the circulating oil supply amount of the engine, and the detected value of the nitrogen oxide compound are obtained to determine the current corresponding detected state of the engine, the current corresponding detected state of the engine needs to be determined, and the determination of the corresponding detected state of the engine is specifically as follows:
judging whether the rotating speed of the engine is within a preset rotating speed threshold interval, whether the circulating oil supply amount of the engine is within a preset circulating oil supply amount threshold interval, and whether the detection value of oxynitride is within a preset oxynitride threshold interval;
in the method provided by the embodiment of the invention, a rotation speed oscillogram can be generated according to the rotation speed of the engine obtained at each moment of the current detection period, so as to judge whether the fluctuation ranges of the rotation speed of the engine at all detection moments in the current detection period are within a preset rotation speed threshold interval, when the rotation speeds of all detection moments in the detection period are within the preset rotation speed threshold interval, the rotation speed of the engine in the current detection period is judged to be within the preset rotation speed threshold interval, for example, the preset rotation speed threshold interval is 2000 r/min-3000 r/min, and when the rotation speed of the engine at the moment 1 of the detection period is 3100r/min, the rotation speed of the engine in the current detection period is judged not to be within the preset rotation speed threshold interval; optionally, the rotation speed detected by the engine in the detection period may also be calculated according to a preset calculation method to obtain a fluctuation rate or a fluctuation gradient of the engine in the detection period, the fluctuation rate or the fluctuation gradient is compared with a preset rotation speed threshold interval, and whether the fluctuation rate or the fluctuation gradient is within the preset rotation speed threshold interval is determined, for example, the calculated fluctuation rate is 5.4%, the preset rotation speed threshold interval is 3% to 7%, and the rotation speed of the engine is within the preset rotation speed threshold interval;
it should be noted that, a waveform diagram of the circulating oil supply amount is generated according to the circulating oil supply amount of the engine obtained at each moment in the current detection period, so as to determine whether the fluctuation range of the circulating oil supply amount of the engine at all detection moments in the current detection period is within the preset rotation speed threshold interval, and when the circulating oil supply amount of all detection moments in the detection period is within the preset rotation speed threshold interval, it is determined that the circulating oil supply amount of the engine in the current detection period is within the preset rotation speed threshold interval, for example, the preset circulating oil supply amount threshold interval is 30mm3/st～50mm3(st) the amount of oil supplied to the engine in the cycle at the time 2 of the detection period is 60mm3Judging that the circulating oil supply amount of the engine in the current detection period is not in a preset rotating speed threshold interval; optionallyThe method can also be implemented by calculating the circulating oil supply amount detected by the engine in the detection period according to a preset calculation method to obtain the fluctuation rate a or the fluctuation gradient b of the engine in the detection period, comparing the fluctuation rate a or the fluctuation gradient b with a preset circulating oil supply amount threshold interval, and judging whether the fluctuation rate a or the fluctuation gradient b is within the preset circulating oil supply amount threshold interval, for example, if the calculated fluctuation rate a is 7%, the preset rotating speed threshold interval is 5% -8%, the rotating speed of the engine is within the preset rotating speed threshold interval;
the method includes the steps that a nitrogen oxide oscillogram is generated according to nitrogen oxide detection values obtained at all moments in a current detection period, so that whether fluctuation ranges of all detection moments of nitrogen oxides in the current detection period are within a preset nitrogen oxide threshold interval or not is judged, and when circulating oil supply amounts of all detection moments in the detection period are within the preset nitrogen oxide threshold interval, the nitrogen oxides in the current detection period are judged to be within a preset rotating speed threshold interval; the method for judging whether the detection value of the oxynitride is within the preset oxynitride threshold interval is the same as the method for judging whether the rotating speed of the engine is within the preset rotating speed threshold range, and the details are not repeated here; it should be noted that, the above-mentioned methods for providing the determination are only two, and it is also possible to determine whether the rotation speed, the amount of circulating oil supply, and the oxynitride are within the respective corresponding preset threshold intervals by other methods.
When the rotating speed of the engine is within the preset rotating speed threshold interval, the circulating oil supply amount of the engine is within the preset circulating oil supply amount threshold interval, and the detection value of the oxynitride of the engine is within the preset oxynitride threshold interval, namely when the rotating speed of the engine, the circulating oil supply amount of the engine and the detection value of the oxynitride are within the corresponding preset threshold intervals at all detection moments in the current detection period, the current corresponding detection state of the engine is judged to be a steady state, and otherwise, the current corresponding detection state of the engine is judged to be a transient state;
in the method provided by the embodiment of the present invention, preferably, the detection state corresponding to the engine may be divided into two cases, namely a steady state and a transient state, it should be noted that, in a detection period, the engine may have two cases, namely the steady state and the transient state, at the same time, assuming that the duration of the current detection period T is 20 minutes, and dividing 20 minutes into 2 detection units by taking 10 minutes as a duration, which respectively correspond to A, B; when the rotating speed of the engine, the circulating oil supply amount of the engine and the detection values of the nitrogen oxides are in the corresponding preset threshold intervals at each moment in the detection unit A, determining that the corresponding state of the engine is a steady state during the detection unit A; in the detection period B, when the rotating speed of the engine, the circulating oil supply amount of the engine and the detected values of the nitrogen oxide and the nitrogen oxide are not in the corresponding preset threshold interval at each moment of the detection unit B, for example, at the moment a, the circulating oil supply amount of the engine is not in the preset circulating oil supply amount threshold interval, and the rotating speed of the engine and the nitrogen oxide are in the corresponding preset threshold intervals, the corresponding state of the engine during the detection unit B is determined to be transient; and in the current detection period T, the corresponding detection state of the engine is a steady state and a transient state.
And S206, judging whether the conditions for selecting the corresponding regulation and control measures are met, if so, executing S207, and otherwise, executing S208.
In the method provided by the embodiment of the invention, the controller judges whether the conditions for selecting corresponding regulation and control measures are met or not according to the judgment result of whether the state and the operation parameters of the oxynitride sensor meet the corresponding operation conditions; when the condition for selecting the corresponding regulation and control measure is satisfied, executing step S207; when the condition for selecting the corresponding regulation and control measure is not met, the regulation and control process is ended; it should be noted that, when each operation parameter is judged to meet the corresponding operation sub-condition, that is, the value of the output characterization judgment result is 1, and the state of the oxynitride sensor is effective, that is, the state value of the characterization oxynitride sensor is 1, the condition of selecting the corresponding regulation and control measure is met; otherwise, the condition for selecting the corresponding regulation and control measure is not satisfied.
And S207, selecting corresponding regulation measures.
In the method provided by the embodiment of the invention, when each operation parameter meets the corresponding operation sub-condition and the state of the oxynitride sensor is effective, the corresponding regulation and control measure needs to be selected and executed according to the current corresponding detection state of the engine and the deviation value of the oxynitride detection value and the oxynitride model value and the result of comparison with the preset deviation threshold value, and when the corresponding regulation and control measure is executed, the current regulation and control is finished.
And S208, ending the flow.
It should be noted that a specific flowchart for selecting a corresponding control measure is shown in fig. 3, and the specific contents are as follows:
s301, acquiring a nitrogen oxide detection value, a nitrogen oxide model value and a detection state corresponding to the engine.
In the method provided by the embodiment of the invention, a model value of oxynitride in the oxynitride virtual sensor, an oxynitride detection value of the oxynitride sensor and a detection state corresponding to the engine are obtained, wherein the detection state is a steady state or a transient state.
S302, calculating a deviation value of the oxynitride according to the oxynitride detection value and the oxynitride model value, and determining a current control state according to the deviation value and the detection state.
In the method provided by the embodiment of the present invention, the detected value of the oxynitride and the model value of the oxynitride are calculated according to a preset series of algorithms to obtain a deviation value of the detected value and the model value of the oxynitride, and the deviation value is compared with a preset deviation threshold, and the specific comparison process can refer to the specific contents in S105, which is not described herein again; judging whether the detection value of the oxynitride output by the engine meets a preset output standard value or not in the current detection period according to the comparison result, judging that the oxynitride is unreasonably discharged when the preset output standard value is not met, and judging that the oxynitride is reasonably discharged when the preset output standard value is met; judging the two situations that the actual oxynitride is reasonably discharged and the actual oxynitride is unreasonable to discharge; according to the comparison result and the detection state, the control state may have several conditions: the current control is reasonable; the steady state control is unreasonable; the transient state control is unreasonable; it should be noted that there may be a possibility that both the steady state and the transient state are unreasonable when both the steady state and the transient state exist, and that the steady state control is unreasonable when only the steady state is unreasonable and the transient state is reasonable; and when only the transient state is unreasonable and the steady state is reasonable, the transient state control is unreasonable.
And S303, determining a corresponding correction strategy according to the control state.
In the method provided by the embodiment of the invention, after the control state corresponding to the engine is determined, the correction strategy corresponding to the control state is determined; when the control state is reasonable, the corresponding correction strategy is to maintain the original control state; when the control state is that the steady state control is unreasonable, the corresponding correction strategy is a steady state control strategy; when the control state is that the transient control is unreasonable, the corresponding correction strategy is a transient control strategy; it should be noted that, when both the steady state and the transient state are unreasonable, the corresponding correction strategy is a control strategy for both the steady state and the transient state.
And S304, selecting a regulating measure corresponding to the correction strategy.
In the method provided by the embodiment of the invention, according to the correction strategy, corresponding regulation and control measures are determined, wherein the regulation and control measures are used for regulating preset regulation and control parameters corresponding to the engine, the preset regulation and control parameters can be the oil injection time of the engine, the exhaust Gas recirculation egr (exhaust Gas recirculation) opening degree and the like, the emission of nitrogen oxides is controlled by regulating the preset regulation and control parameters, it needs to be noted that the regulation and control parameters corresponding to different correction strategies can be the same or different, the regulation and control degrees of the regulation and control parameters of different correction strategies can be determined according to actual conditions, and the regulation and control values corresponding to the regulation and control parameters can be calculated according to the actually detected parameters, so that the regulation and control parameters can be corrected.
By applying the method provided by the embodiment of the invention, the nitrogen oxide emitted by the engine can be controlled, and the invention also provides a flow chart for controlling the emission of the nitrogen oxide, as shown in fig. 4, the specific contents are as follows:
s401, various parameters are obtained to check the reasonability of the engine to discharge nitrogen oxides, and a correction strategy corresponding to the engine is determined.
In the method provided by the embodiment of the invention, when whether the oxynitride discharged by the engine during operation is reasonable is checked, a large number of parameters, such as the operation state of the engine, the water temperature and the pressure of the engine and other parameters, need to be obtained, a series of logic deductions or calculations and the like are carried out through the parameters, and whether the oxynitride discharged by the engine is reasonable is judged, so that the current corresponding correction strategy of the engine is determined; when the rationality of the nitrogen oxide discharged by the engine is checked, whether each running parameter of the engine in running meets the corresponding preset detection running condition needs to be judged, when all running parameters are met, a deviation value of the discharged nitrogen oxide is determined according to a detection value of the nitrogen oxide and a model value of the nitrogen oxide, the deviation value is compared with a preset deviation threshold value to obtain a comparison result, a corresponding correction strategy is determined according to the comparison result and the obtained detection state corresponding to the engine, and the rationality of the nitrogen oxide discharged by the engine is judged according to the correction strategy.
S402, selecting corresponding regulation and control measures according to the correction strategy.
According to the method provided by the embodiment of the invention, after the current correction strategy of the engine is determined, the regulation and control measures corresponding to the correction strategy are selected, and different correction strategies correspond to different regulation and control measures so as to control the nitrogen oxide emitted by the engine within a reasonable range.
In order to control the nitrogen oxide emission, another specific flow chart is provided in the embodiment of the present invention, as shown in fig. 5, which is specifically described as follows:
s501, obtaining various operation parameters.
In the method provided by the embodiment of the present invention, various operating parameters corresponding to an operating engine are obtained, where the various operating parameters may be an engine operating state, an engine water temperature, an ambient temperature, an engine combustion chamber pressure value, an intake manifold temperature, and the like, which are not listed here.
S502, judging whether each operation parameter meets the corresponding preset detection operation condition, and if so, executing S503; if not, go to S507.
In the method provided by the embodiment of the invention, after obtaining each operation parameter, determining a preset detection operation condition corresponding to each operation parameter, and judging whether each operation parameter meets the preset detection operation condition, for example, if the temperature of an intake manifold is 40 ℃, the preset detection operation condition corresponding to the temperature is 40-51 ℃, the temperature of the intake manifold meets the preset operation condition; when all the operation parameters meet the respective corresponding detection operation conditions, S503 is executed; and when the operation parameters do not meet the expected corresponding detection operation conditions, ending the regulation and control process.
And S503, determining the current corresponding detection state of the engine.
In the method provided by the embodiment of the invention, when various operating parameters are determined to meet respective corresponding preset operating conditions, the parameters for determining the detection state of the engine are obtained so as to determine the current corresponding detection state of the engine; it should be noted that, in the various operating parameters, when the various operating parameters do not satisfy the preset operating conditions corresponding to the various operating parameters, the current detection state of the engine needs to be determined; the specific process of determining the current detection state of the engine may refer to the specific description of S205, which is not described herein again; in the method provided by the embodiment of the present invention, preferably, the state of the engine is a steady state or a transient state in the current detection period.
S504, comparing the deviation value of the detection value of the oxynitride and the model value of the oxynitride with a preset deviation threshold value to obtain a comparison result.
In the method provided by the embodiment of the invention, when the deviation value is compared with a preset deviation threshold value, a nitrogen oxide detection value and a nitrogen oxide model value need to be determined, and the nitrogen oxide detection value and the nitrogen oxide model value are calculated according to a preset algorithm to determine the deviation value between the nitrogen oxide detection value and the nitrogen oxide model value; comparing the calculated deviation value with a preset deviation threshold value, and judging that the discharged oxynitride meets a preset output standard value if the comparison result can be that the deviation value is within the preset deviation threshold value, namely the discharged oxynitride is reasonable; when the deviation value is not within the preset deviation threshold value; the discharged nitrogen oxide is judged not to meet the preset output standard value, namely, the discharge is unreasonable.
And S505, determining a correction strategy corresponding to the engine according to the detection state and the comparison result.
In the method provided by the embodiment of the invention, the detection result corresponding to the current engine can be classified as transient state or steady state; the comparison result of the deviation value and the preset deviation threshold value can be divided into two conditions of reasonable emission and unreasonable emission of oxynitride emitted by the engine; then according to the detection result and the comparison result, the following control states of the engine can be obtained: the current control is reasonable; the steady state control is unreasonable; the transient state control is unreasonable; according to the control state, the corresponding correction policy is determined, and the specific determination process may refer to S303, which is not described herein again.
And S506, executing corresponding regulation and control measures according to the correction strategy.
In the method provided by the embodiment of the present invention, after the corresponding correction policy is determined, the regulation and control measure corresponding to the correction policy is determined, and the corresponding regulation and control parameter is regulated and controlled according to the regulation and control measure, and the specific process may refer to S304, which is not described herein again.
And S507, finishing the regulation and control flow.
In the method provided by the embodiment of the invention, by applying the method provided by the invention, when various parameters of the engine meet respective corresponding preset conditions, the current corresponding detection state of the engine and the deviation value of the detection value of the oxynitride and the model value are determined, the deviation value is compared with a preset deviation threshold value to obtain a comparison result, and corresponding regulation and control measures are selected according to the comparison result and the current corresponding detection state of the engine to regulate and control the oxynitride discharged by the engine within a reasonable range.
In the method provided by the embodiment of the present invention, a diagram of a processing device for engine exhaust nitrogen oxide is referred to for description, a specific example diagram is shown in fig. 6, it should be noted that an execution subject of the present invention may be a processor or a controller of an automobile, or a controller or a processor in a control system, which regulates and controls various parameters of an engine through signal transmission; the controller can be arranged together with the engine to regulate and control various parameters of the engine; the engine can be provided with a detection module for detecting various parameters and directly sending the parameters to the controller through the engine, the NOx sensor is a nitrogen oxide sensor for detecting nitrogen oxide emitted by the engine and providing an actual nitrogen oxide detection value for the controller, and the virtual NOx sensor is a virtual nitrogen oxide sensor for providing a preset nitrogen oxide model value for the controller; the processing device is divided into an original exhaust processing stage and a rear exhaust processing stage, the original exhaust processing stage is processing when the engine discharges oxynitride, the rear exhaust processing stage is that after the oxynitride is discharged, the corresponding catalyst is applied to carry out oxidation reduction on the oxynitride, and the rear processing stage in fig. 6 is provided with: a Diesel oxidation catalyst (Diesel oxidation catalyst) DOC, a Diesel Particulate Filter (DPF), a Selective Catalytic Reduction (Selective Catalytic Reduction) SCR/drive Anti-slip control system (Anti-slip control) ASC, wherein a reducing agent can be applied to reduce nitrogen oxides discharged by an engine through equipment arranged in a post-treatment stage so as to control the emission of the nitrogen oxides within a reasonable range; by applying the method provided by the embodiment of the invention, the discharge amount of nitrogen oxide discharged by the engine can be controlled within the treatment capacity of the after-treatment, and the pressure of the after-treatment on the nitrogen oxide is reduced, so that the final discharged nitrogen oxide is ensured to be in a reasonable range; by applying the method provided by the embodiment of the invention, the nitrogen oxide discharged by the engine can be controlled within a reasonable range, the conversion pressure of aftertreatment is reduced, and the closed-loop regulation of the discharge of the nitrogen oxide is realized by regulating and controlling the parameters of the engine.
Corresponding to the method illustrated in fig. 1, an embodiment of the present invention further provides a device for regulating and controlling emission of an oxynitride, where a specific device structure diagram is illustrated in fig. 7, and the specific content is as follows:
a determining unit 701, configured to, when a preset enabling condition is met, obtain, in a current detection period, each operating parameter corresponding to an engine during an operation of the engine, and determine whether each operating parameter meets a preset detection operating condition;
an obtaining unit 702, configured to obtain a detected value of an oxynitride in the detected state, a rotation speed of the engine, and a circulating oil supply amount of the engine when each of the operation parameters satisfies the preset detection operation condition;
a first determining unit 703, configured to determine a current corresponding detection state of the engine according to the detected value of the oxynitride, the rotation speed of the engine, and a circulating oil supply amount of the engine;
a second determining unit 704, configured to determine a deviation value between the detected value of the oxynitride and a preset model value of the oxynitride;
a comparison unit 705, configured to compare the deviation value with a preset deviation threshold to obtain a comparison result;
a control unit 706, configured to select a corresponding control measure according to the comparison result and the detection state, so as to control the emission amount of nitrogen oxides.
The invention provides a regulating and controlling device for nitrogen oxide emission, which is used for obtaining various operating parameters corresponding to an engine, obtaining a detection value of the nitrogen oxide, the rotating speed of the engine and the circulating oil supply amount of the engine in a detection state when the operating parameters meet preset detection operating conditions, and determining the current corresponding detection state of the engine according to the detection value of the nitrogen oxide, the rotating speed of the engine and the circulating oil supply amount of the engine; determining a deviation value of a detection value of the oxynitride and a preset oxynitride model value; comparing the deviation value with a preset deviation threshold value; and selecting corresponding regulation and control measures according to the comparison result and the detection state so as to control the discharge amount of the oxynitride. By applying the method provided by the invention, the nitrogen oxide discharged by the engine is controlled within a reasonable range, the conversion pressure of post-treatment is reduced, and the closed-loop regulation of the discharge of the nitrogen oxide is realized by regulating and controlling the parameters of the engine.
In the apparatus provided in the embodiment of the present invention, the determining unit in the device for regulating and controlling nitrogen oxide emission may be configured to:
a determining subunit, configured to determine respective corresponding operation sub-conditions of the operation parameters;
and the first judgment subunit is used for judging whether each operation parameter meets the corresponding operation sub-condition, and when each operation parameter meets the corresponding operation sub-condition, judging that each operation parameter meets the preset detection operation condition.
In the apparatus provided in an embodiment of the present invention, the first determining unit in the device for regulating and controlling nitrogen oxide emission may be configured to:
the second judging subunit is used for judging whether the rotating speed of the engine is within a preset rotating speed threshold interval, whether the circulating oil supply amount of the engine is within a preset circulating oil supply amount threshold interval, and whether the detection value of the oxynitride of the engine is within a preset oxynitride threshold interval;
and the judging subunit is used for judging that the current corresponding detection state of the engine is a steady state when the rotating speed of the engine is within the preset rotating speed threshold interval, the circulating oil supply of the engine is within the preset circulating oil supply threshold interval, and the detection value of oxynitride of the engine is within the preset oxynitride threshold interval, or judging that the current corresponding detection state of the engine is a transient state.
In the device provided in the embodiment of the present invention, the control unit in the device for controlling nitrogen oxide emission may be configured as:
the first selection subunit is used for judging whether the detection value of the oxynitride output by the engine meets a preset output standard value in the current detection period according to the comparison result; and when the detection value of the oxynitride is larger than the preset output standard value, calling a preset steady-state control correction strategy, and adjusting a preset regulation and control parameter corresponding to the engine to control the emission of the oxynitride by the engine.
In the device provided in the embodiment of the present invention, the control unit in the device for controlling nitrogen oxide emission may be configured as:
the second selection subunit is used for judging whether the detection value of the oxynitride output by the engine meets a preset output standard value in the current detection period according to the comparison result; and when the detection value of the oxynitride is larger than the preset output standard value, calling a preset transient control correction strategy, and adjusting a preset regulation and control parameter corresponding to the engine to control the emission of the oxynitride by the engine.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments, which are substantially similar to the method embodiments, are described in a relatively simple manner, and reference may be made to some descriptions of the method embodiments for relevant points. The above-described system and system embodiments are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. 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 invention. Thus, the present invention 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 for regulating and controlling the emission of nitrogen oxides is characterized by comprising the following steps:
when a preset enabling condition is met, acquiring various operating parameters corresponding to the engine in the running process of the engine in the current detection period, and judging whether the various operating parameters meet the preset detection running condition;
when all the operation parameters meet the preset detection operation condition, acquiring a nitrogen oxide detection value, the rotating speed of the engine and the circulating oil supply quantity of the engine in the current detection period;
determining a current corresponding detection state of the engine according to the detection value of the oxynitride, the rotating speed of the engine and the circulating oil supply amount of the engine;
determining a deviation value of the detection value of the oxynitride and a preset oxynitride model value;
comparing the deviation value with a preset deviation threshold value to obtain a comparison result;
selecting corresponding regulation and control measures according to the comparison result and the detection state so as to control the discharge amount of the oxynitride;
wherein, the determining the current corresponding detection state of the engine according to the detection value of the oxynitride, the rotating speed of the engine and the circulating oil supply amount of the engine comprises the following steps:
judging whether the rotating speed of the engine is within a preset rotating speed threshold interval, whether the circulating oil supply amount of the engine is within a preset circulating oil supply amount threshold interval, and whether the detection value of the oxynitride of the engine is within a preset oxynitride threshold interval;
when the rotating speed of the engine is within the preset rotating speed threshold interval, the circulating oil supply amount of the engine is within the preset circulating oil supply amount threshold interval, and the detection value of oxynitride of the engine is within a preset oxynitride threshold interval, judging that the current corresponding detection state of the engine is a steady state, otherwise, judging that the current corresponding detection state of the engine is a transient state;
when the current corresponding detection state of the engine is a steady state, selecting corresponding regulation and control measures according to the comparison result and the detection state to control the discharge amount of nitrogen oxides, wherein the regulation and control measures comprise the following steps:
judging whether the detection value of the oxynitride output by the engine meets a preset output standard value in the current detection period according to the comparison result;
and when the detection value of the oxynitride is larger than the preset output standard value, calling a preset steady-state control correction strategy, and adjusting a preset regulation and control parameter corresponding to the engine to control the emission of the oxynitride by the engine.
2. The method of claim 1, wherein the predetermined detection operating condition comprises a plurality of operating sub-conditions, and the determining whether the operating parameters satisfy the predetermined detection operating condition comprises:
determining operation sub-conditions corresponding to the operation parameters respectively;
judging whether each operation parameter meets the corresponding operation sub-condition;
and when each operation parameter meets the corresponding operation sub-condition, judging that each operation parameter meets the preset detection operation condition.
3. The method according to claim 1, wherein when the current corresponding detected state of the engine is transient, the selecting corresponding control measures according to the comparison result and the detected state to control the emission of nitrogen oxides comprises:
judging whether the detection value of the oxynitride output by the engine meets a preset output standard value in the current detection period according to the comparison result;
and when the detection value of the oxynitride is larger than the preset output standard value, calling a preset transient control correction strategy, and adjusting a preset regulation and control parameter corresponding to the engine to control the emission of the oxynitride by the engine.
4. An oxynitride discharge regulation device, comprising:
the judging unit is used for acquiring various running parameters corresponding to the engine in the running process of the engine in the current detection period when the preset enabling condition is met, and judging whether the various running parameters meet the preset detection running condition;
the acquisition unit is used for acquiring the detection value of the oxynitride, the rotating speed of the engine and the circulating oil supply quantity of the engine in the current detection period when all the operation parameters meet the preset detection operation condition;
the first determining unit is used for determining a current corresponding detection state of the engine according to the detection value of the oxynitride, the rotating speed of the engine and the circulating oil supply amount of the engine;
a second determination unit, configured to determine a deviation value between the detected value of the oxynitride and a preset oxynitride model value;
the comparison unit is used for comparing the deviation value with a preset deviation threshold value to obtain a comparison result;
the regulating unit is used for selecting corresponding regulating measures according to the comparison result and the detection state so as to control the discharge amount of the oxynitride;
wherein the first determining unit includes:
the second judging subunit is used for judging whether the rotating speed of the engine is within a preset rotating speed threshold interval, whether the circulating oil supply amount of the engine is within a preset circulating oil supply amount threshold interval, and whether the detection value of the oxynitride of the engine is within a preset oxynitride threshold interval;
the judging subunit is used for judging that the current corresponding detection state of the engine is a steady state when the rotating speed of the engine is within the preset rotating speed threshold interval, the circulating oil supply amount of the engine is within the preset circulating oil supply amount threshold interval, and the detection value of oxynitride of the engine is within a preset oxynitride threshold interval, or judging that the current corresponding detection state of the engine is a transient state;
the regulatory unit comprises:
the first selection subunit is used for judging whether the detection value of the oxynitride output by the engine meets a preset output standard value in the current detection period according to the comparison result; and when the detection value of the oxynitride is larger than the preset output standard value, calling a preset steady-state control correction strategy, and adjusting a preset regulation and control parameter corresponding to the engine to control the emission of the oxynitride by the engine.
5. The apparatus according to claim 4, wherein the determining unit comprises:
a determining subunit, configured to determine respective corresponding operation sub-conditions of the operation parameters;
and the first judgment subunit is used for judging whether each operation parameter meets the corresponding operation sub-condition, and when each operation parameter meets the corresponding operation sub-condition, judging that each operation parameter meets the preset detection operation condition.
6. The device of claim 4, wherein the regulatory unit comprises:
the second selection subunit is used for judging whether the detection value of the oxynitride output by the engine meets a preset output standard value in the current detection period according to the comparison result; and when the detection value of the oxynitride is larger than the preset output standard value, calling a preset transient control correction strategy, and adjusting a preset regulation and control parameter corresponding to the engine to control the emission of the oxynitride by the engine.
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