CN114876657B - Engine nitrogen oxide emission control method and device - Google Patents
Engine nitrogen oxide emission control method and device Download PDFInfo
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- CN114876657B CN114876657B CN202210498372.6A CN202210498372A CN114876657B CN 114876657 B CN114876657 B CN 114876657B CN 202210498372 A CN202210498372 A CN 202210498372A CN 114876657 B CN114876657 B CN 114876657B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/146—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration
- F02D41/1461—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration of the exhaust gases emitted by the engine
- F02D41/1462—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration of the exhaust gases emitted by the engine with determination means using an estimation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/36—Control for minimising NOx emissions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention provides a control method and a device for nitrogen oxide emission of an engine, wherein the method comprises the following steps: acquiring state parameters of an engine under the condition that the running state of the engine meets preset control conditions; calculating the window specific emission of nitrogen oxides in the tail row of the engine according to the state parameters; the engine tail refers to post-treated emissions of the engine; acquiring the parameter quantity of the control parameter of the engine in a power base window to which the window specific discharge belongs under the condition that the window specific discharge is not in a preset specific discharge interval; calculating the parameter of the control parameter in the next power base window of the power base window according to the parameter in the power base window and a preset fixed adjustment factor; and controlling the emission of nitrogen oxides of the engine according to the parameter quantity in the next power base window. By applying the method provided by the invention, the emission of nitrogen oxides can be reasonably controlled.
Description
Technical Field
The invention relates to the technical field of exhaust gas emission aftertreatment of internal combustion engines, in particular to a control method and a device for nitrogen oxide emission of an engine.
Background
During the running process of the engine, the problems of excessively high or excessively low emission of nitrogen oxides (NOx) can be caused easily due to the situations of drifting of a nitrogen oxide (NOx) sensor of the engine, urea injection deviation, aging of the engine and the like.
Disclosure of Invention
The invention aims to provide a control method for nitrogen oxide emission of an engine, which can reasonably control the nitrogen oxide emission.
The invention also provides a control device for the emission of the nitrogen oxides of the engine, which is used for ensuring the realization and the application of the method in practice.
A method of controlling engine nitrogen oxide emissions, comprising:
acquiring state parameters of an engine under the condition that the running state of the engine meets preset control conditions;
calculating the window specific emission of nitrogen oxides in the tail row of the engine according to the state parameters; the engine tail refers to post-treated emissions of the engine;
acquiring the parameter quantity of the control parameter of the engine in a power base window to which the window specific discharge belongs under the condition that the window specific discharge is not in a preset specific discharge interval;
calculating the parameter of the control parameter in the next power base window of the power base window according to the parameter in the power base window and a preset fixed adjustment factor;
and controlling the emission of nitrogen oxides of the engine according to the parameter quantity in the next power base window.
The method, optionally, the calculating the window specific emission of the nitrogen oxides in the tail of the engine according to the state parameter includes:
calculating a sliding average value of each parameter item in the state parameters of the engine in each preset sub-power base window; the state parameters comprise at least one parameter item of SCR temperature, engine speed, engine torque, original emission of nitrogen oxides of an engine and emission of nitrogen oxides of an engine tail; the engine raw exhaust refers to raw exhaust materials of the engine which are not subjected to aftertreatment;
under the condition that each sub-power base window meets the preset effective condition, the sub-power base windows are used for successful base windows, and the sliding average value of each parameter item of each sub-power base window of the power base window is subjected to exponential weighted moving average to obtain the window specific discharge of the nitrogen oxides of the engine tail emission under the power base window.
The above method, optionally, determines that each sub-power base window meets a preset effective condition, including:
judging whether the accumulated power of each sub-power base window meets a preset accumulated power threshold value or not;
judging whether the sliding average value of each parameter item of each sub-power base window is in a threshold value interval corresponding to the parameter item;
if the judging results are yes, determining that the sub-power base window meets the preset effective condition.
In the above method, optionally, when the specific emission of the window is greater than the upper limit value of the specific emission interval, calculating, according to the parameter number of the power base window and a preset fixed adjustment factor, the parameter number of the control parameter in a next power base window of the power base window includes:
subtracting a preset fixed adjustment factor from the parameter quantity under the power base window to obtain the parameter quantity of the control parameter in the next power base window of the power base window.
In the above method, optionally, when the specific emission of the window is less than the lower limit value of the specific emission interval, calculating, according to the parameter number of the power base window and a preset fixed adjustment factor, the parameter number of the control parameter in a next power base window of the power base window includes:
and adding a preset fixed adjustment factor to the parameter quantity under the power base window to obtain the parameter quantity of the control parameter in the next power base window of the power base window.
The method, optionally, further comprises:
and under the condition that the window specific discharge is in a preset specific discharge interval, taking the parameter quantity of the control parameter in a power base window to which the window specific discharge belongs as the parameter quantity of the control parameter in a next power base window of the power base window.
A control device for engine nitrogen oxide emissions, comprising:
the first acquisition unit is used for acquiring state parameters of the engine under the condition that the running state of the engine meets the preset control condition;
a first calculation unit for calculating a window specific emission of nitrogen oxides in the tail line of the engine according to the state parameter; the engine tail refers to post-treated emissions of the engine;
the second acquisition unit is used for acquiring the parameter quantity of the control parameter of the engine in the power base window to which the window specific discharge belongs under the condition that the window specific discharge is not in a preset specific discharge interval;
the second calculation unit is used for calculating the parameter quantity of the control parameter in the next power base window of the power base window according to the parameter quantity under the power base window and a preset fixed adjustment factor;
and the control unit is used for controlling the emission of nitrogen oxides of the engine according to the parameter quantity in the next power base window.
The above apparatus, optionally, the first computing unit includes:
the first calculating subunit is used for calculating a sliding average value of each parameter item in the state parameters of the engine in each preset sub-power base window; the state parameters comprise at least one parameter item of SCR temperature, engine speed, engine torque, original emission of nitrogen oxides of an engine and emission of nitrogen oxides of an engine tail; the engine raw exhaust refers to raw exhaust materials of the engine which are not subjected to aftertreatment;
and the second calculation subunit is used for determining that each sub-power base window meets the preset effective condition, and carrying out exponential weighted moving average on the sliding average value of each parameter item of each sub-power base window of each power base window by each sub-power base window group to obtain the window specific discharge amount of the nitrogen oxides of the engine tail emission under the power base window.
In the above apparatus, optionally, in a case where the window specific discharge is greater than an upper limit value of the specific discharge interval, the second calculating unit is configured to:
subtracting a preset first fixed adjustment factor from the parameter quantity under the power base window to obtain the parameter quantity of the control parameter in the next power base window of the power base window.
In the above apparatus, optionally, in a case where the window specific discharge is smaller than a lower limit value of the specific discharge interval, the second calculating unit is configured to:
and adding a preset second fixed adjustment factor to the parameter quantity under the power base window to obtain the parameter quantity of the control parameter in the next power base window of the power base window.
Based on the scheme, the invention provides a control method and a device for nitrogen oxide emission of an engine, wherein the method comprises the following steps: acquiring state parameters of an engine under the condition that the running state of the engine meets preset control conditions; calculating the window specific emission of nitrogen oxides in the tail row of the engine according to the state parameters; the engine tail refers to post-treated emissions of the engine; acquiring the parameter quantity of the control parameter of the engine in a power base window to which the window specific discharge belongs under the condition that the window specific discharge is not in a preset specific discharge interval; calculating the parameter of the control parameter in the next power base window of the power base window according to the parameter in the power base window and a preset fixed adjustment factor; and controlling the emission of nitrogen oxides of the engine according to the parameter quantity in the next power base window. By applying the method provided by the embodiment of the invention, the problem of excessively high or excessively low emission of nitrogen oxides caused by the conditions of drifting of the nitrogen oxide sensor, urea injection deviation or aging of the engine can be solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for controlling emissions of nitrogen oxides in an engine according to the present invention;
FIG. 2 is a flow chart of a process for calculating a window specific emission of NOx in an engine tail according to a state parameter provided by the present invention;
FIG. 3 is a flow chart of yet another engine NOx emission control method provided by the present invention;
FIG. 4 is a flow chart of an engine bank control process provided by the invention;
FIG. 5 is a schematic diagram of a closed-loop control of a fixed adjustment factor according to the present invention;
fig. 6 is a schematic structural diagram of a control device for controlling nitrogen oxide emission of an engine according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The embodiment of the invention provides a control method for nitrogen oxide emission of an engine, which can be applied to a controller of a vehicle, for example, can be an intelligent primary-emission coordinator, and the method comprises the following steps:
s101: and acquiring state parameters of the engine under the condition that the running state of the engine meets the preset control condition.
In this embodiment, the operation state information of the engine may be obtained first, and whether the operation state of the engine satisfies the control condition may be determined according to the operation state information of the engine, where the operation state information may include at least one of an engine exhaust temperature, an engine exhaust flow rate, an engine water temperature, an engine rotation speed, an engine torque, a selective catalytic conversion device SCR temperature, and a particulate matter trap DPF carbon loading.
Optionally, if the engine exhaust temperature is in a preset exhaust temperature range, the engine water temperature is in a preset water temperature range, the engine speed is in a preset rotational speed range, the engine torque is in a preset torque range and the engine health state information indicates that the engine has no mode switching fault, then determining that the running state of the engine meets the control condition.
S102: calculating the window specific emission of nitrogen oxides in the tail row of the engine according to the state parameters; the engine tail refers to the post-treated emissions materials of the engine.
In this embodiment, the window specific emission of nitrogen oxides in the engine tail may be calculated based on the state parameter using the power base window.
Alternatively, the after-treated exhaust material may be a material obtained by treating an original exhaust material of an engine by an after-treatment system of the engine, and the after-treatment system may include: a NOx sensor of DPF, SCR, SCR, an SCR upstream temperature sensor, etc.
S103: and under the condition that the window specific discharge is not in a preset specific discharge interval, acquiring the parameter quantity of the control parameter of the engine in the power base window to which the window specific discharge belongs.
In the present embodiment, the control parameter may be one of an advance angle, a rail pressure, and an EGR valve parameter.
S104: and calculating the parameter quantity of the control parameter in the next power base window of the power base window according to the parameter quantity in the power base window and a preset fixed adjustment factor.
In this embodiment, the fixed adjustment factor is matched with the control parameter, and in the case that the control parameter is an advance angle, the fixed adjustment factor may be the advance angle adjustment factor; in the case where the control parameter is rail pressure, the fixed adjustment factor may be a rail pressure adjustment factor; in the case where the control parameter is an EGR valve, the fixed adjustment factor may be an EGR valve adjustment factor.
S105: and controlling the emission of nitrogen oxides of the engine according to the parameter quantity in the next power base window.
In this embodiment, in the case where the control parameter is an advance angle, the magnitude of the advance angle may be controlled by the parameter amount of the advance angle, thereby controlling the magnitude of the emission of nitrogen oxides from the engine; under the condition that the control parameter is rail pressure, controlling the magnitude of the rail pressure through the parameter quantity of the rail pressure, so as to control the magnitude of the emission of nitrogen oxides of the engine; in the case where the control parameter is an EGR valve parameter of the EGR valve, the magnitude of the opening of the EGR valve is controlled by the parameter amount of the EGR valve parameter, thereby controlling the magnitude of the emission of nitrogen oxides of the engine.
Optionally, after controlling the emission of the nitrogen oxides of the engine according to the parameter amount in the next power base window, it may be determined whether the running state of the engine meets the control condition according to the current running state information of the engine, and if so, S101 is executed again.
By applying the method provided by the embodiment of the invention, the problem of excessively high or excessively low emission of nitrogen oxides caused by the conditions of drifting of the nitrogen oxide sensor, urea injection deviation or aging of the engine can be solved.
In an embodiment of the present invention, based on the foregoing solution, optionally, the calculating the window specific emission of the nitrogen oxides in the tail line of the engine according to the state parameter, as shown in fig. 2, includes:
s201: calculating a sliding average value of each parameter item in the state parameters of the engine in each preset sub-power base window; the state parameters comprise at least one parameter item of SCR temperature, engine speed, engine torque, original emission of nitrogen oxides of an engine and emission of nitrogen oxides of an engine tail; the engine bank refers to raw exhaust matter of the engine that has not been post-treated.
In the embodiment, the accumulation of the instantaneous power of the engine can be performed in real time in the sub-power base window, and when certain power is met, the calculation of one sub-power base window is completed; and carrying out sliding average filtering on each parameter item in real time in one sub-power base window to obtain a sliding average value of each parameter item.
S202: under the condition that each sub-power base window meets the preset effective condition, the sub-power base windows are used for successful base windows, and the sliding average value of each parameter item of each sub-power base window of the power base window is subjected to exponential weighted moving average to obtain the window specific discharge of the nitrogen oxides of the engine tail emission under the power base window.
In this embodiment, an exponentially weighted moving average EWMA may be performed on each sub-power base window to obtain a window specific discharge.
In an embodiment of the present invention, based on the above solution, optionally, the process of determining that each sub-power base window meets a preset effective condition includes:
judging whether the accumulated power of each sub-power base window meets a preset accumulated power threshold value or not;
judging whether the sliding average value of each parameter item of each sub-power base window is in a threshold value interval corresponding to the parameter item;
if the judging results are yes, determining that the sub-power base window meets the preset effective condition.
In this embodiment, the real-time engine instantaneous power of the sub-power base window may be accumulated to obtain the accumulated power of the sub-power base window, the obtained accumulated power is compared with a preset accumulated power threshold, and if the accumulated power is greater than or equal to the accumulated power threshold, it is determined that the accumulated power of the sub-power base window meets the accumulated power threshold.
Optionally, a sliding average value of each parameter item in the state parameters is obtained by sliding filtering the state parameters of each sub-power base window.
In an embodiment of the present invention, based on the foregoing solution, optionally, when the specific emission of the window is greater than the upper limit value of the specific emission interval, calculating, according to the parameter number of the power base window and a preset fixed adjustment factor, a parameter number of the control parameter in a next power base window of the power base window includes:
subtracting a preset fixed adjustment factor from the parameter quantity under the power base window to obtain the parameter quantity of the control parameter in the next power base window of the power base window.
In this embodiment, the fixed adjustment factor may be a smaller value, for example, the control parameter is an advance angle, and the fixed adjustment factor may be 0.5 ° or 1 ° or the like; the control parameter is rail pressure, and the fixed adjustment factor can be 100hPa or 50hPa, and the window specific discharge is smaller than or equal to the upper limit value of the specific discharge interval by controlling closed loop control, so that the window specific discharge is in the preset specific discharge interval.
In an embodiment of the present invention, based on the foregoing solution, optionally, when the specific emission of the window is smaller than the lower limit value of the specific emission interval, calculating, according to the parameter number of the power base window and a preset fixed adjustment factor, a parameter number of the control parameter in a next power base window of the power base window includes:
and adding a preset fixed adjustment factor to the parameter quantity under the power base window to obtain the parameter quantity of the control parameter in the next power base window of the power base window.
In this embodiment, when the window specific discharge amount is smaller than the lower limit value of the specific discharge zero interval, the window specific discharge amount may be made to be greater than or equal to the lower limit value of the specific discharge interval by closed-loop control, so that the window specific discharge amount is within the preset specific discharge interval.
The embodiment of the invention can avoid larger oscillation of the system caused by overlarge adjustment amplitude by the closed-loop control of the fixed adjustment factor.
Referring to fig. 3, the method for controlling the emission of nitrogen oxides of the engine according to the embodiment of the invention further includes the following procedures:
s106: and under the condition that the window specific discharge is in a preset specific discharge interval, taking the parameter quantity of the control parameter in a power base window to which the window specific discharge belongs as the parameter quantity of the control parameter in a next power base window of the power base window.
In this embodiment, if the window is a specific discharge interval preset by the specific discharge amount of the vinegar fish, the parameter number of the control parameter may be maintained unchanged.
In some embodiments, the obtaining the parameter amount of the control parameter of the engine in the power base window to which the window ratio emission belongs includes:
under the condition that the power base window is the first power base window, taking the initial value of the control parameter as the parameter of the control parameter in the power base window;
under the condition that the power base window is not the first power base window, determining the parameter quantity under the previous power base window of the power base window, and if the window specific discharge quantity of the previous power base window of the power base window is larger than the upper limit value of the specific discharge quantity interval, subtracting a preset fixed adjustment factor from the parameter quantity under the previous power base window to obtain the parameter quantity of the control parameter under the power base window; and if the window specific discharge amount is smaller than the lower limit value of the specific discharge amount interval, adding a preset fixed adjustment factor to the parameter amount under the previous power base window to obtain the parameter amount of the control parameter under the power base window.
In some embodiments, the intelligent bank coordinator may be configured to determine a current state of the engine, and perform adaptive closed-loop control of the intelligent bank when the engine meets a release condition of the intelligent bank control, where main enabling conditions are as follows:
1. the exhaust temperature of the engine is within a certain range;
2. the exhaust flow of the engine is in a certain range;
3. the water temperature of the engine is within a certain range;
4. the engine speed is within a certain range;
5. the engine torque is within a certain range;
6. the temperature of the post-treatment SCR is within a certain range;
7. DPF carbon loading is within a certain range;
8. no related engine faults exist, and the system can be ensured to normally operate.
Under the condition that the conditions are met, as shown in fig. 4, the NOx in the tail emission window can be calculated first, the NOx in the tail emission window is calculated by adopting a large power base window and a small power base window, and the effectiveness and the instantaneity of the tail emission calculation are ensured. The small window accumulates the instantaneous power of the engine in real time, when certain power is met, the calculation of one small window is completed, meanwhile, the states of the engine such as SCR temperature, engine rotating speed, engine torque, engine original emission NOx, engine tail emission NOx and the like are calculated, the average value is obtained by sliding in real time in the process of accumulating the small windows, and when the average value of the states of the engines meets certain requirements and the accumulated power of the small window meets the requirements, the small window is considered to be effective. A large window is formed by a plurality of effective small windows, and the index weighted moving average (EWMA) of the small windows is carried out, so that a relatively real window ratio emission NOxAct of NOx discharged from the tail of the engine can be obtained.
The suitable range is a target tail-emission window ratio emission NOxTgt determined according to the after-treatment state of the engine, such as SCR temperature, exhaust gas flow, engine speed, engine torque, etc., and a sufficient margin is reserved to avoid frequent jump during adjustment, so the adjustment window can be defined as a lower limit value NOxTgtLow of the specific emission interval and an upper limit value NOxTgtHigh of the specific emission interval, and once the suitable range is exceeded, that is, when the actual noxoact is higher than the NOxTgtHigh value or the noxoact is lower than the NOxTgtLow value, closed-loop control based on the NOx window ratio emission is performed. Control parameters of the engine (optionally one of the following control parameters such as advance angle, rail pressure, EGR valve).
The closed loop adjusting method is fixed increment closed loop adjustment, when deviation between a target value NOxTgt and an actual value NOxAct exceeds a positive value constant, the control quantity carries out increment accumulation of each window according to fixed increment, and when the deviation exceeds a negative value constant, the control quantity carries out decrement of each window based on the current number, so that the fixed increment closed loop adjustment based on the specific emission of the engine tail row window is realized.
As shown in fig. 5, closed loop adjustment may be performed in the adjustment area by fixed increment factor closed loop control, otherwise the previously calculated result is maintained, and when a special situation exists, the closed loop control may be exited while the increment factor is reset. The increment factor can be different output parameters for different control objects, if the advance angle needs to be controlled, the increment factor can be defined as 0.5 degree or 1 degree, etc., if the control object is rail pressure, the control increment can be defined as 100hPa or 50hPa, etc.
Corresponding to the method shown in fig. 1, the embodiment of the invention further provides a control device for emission of nitrogen oxides of an engine, which is used for implementing the method shown in fig. 1, and a schematic structural diagram of the control device for emission of nitrogen oxides of an engine provided in the embodiment of the invention is shown in fig. 6, and specifically includes:
a first obtaining unit 601, configured to obtain a state parameter of an engine when an operation state of the engine meets a preset control condition;
a first calculation unit 602, configured to calculate a window specific emission of nitrogen oxides in the tail line of the engine according to the state parameter; the engine tail refers to post-treated emissions of the engine;
a second obtaining unit 603, configured to obtain, when the window specific emission is not in a preset specific emission interval, a parameter number of a control parameter of the engine in a power base window to which the window specific emission belongs;
a second calculating unit 604, configured to calculate, according to the parameter amount under the power base window and a preset fixed adjustment factor, a parameter amount of the control parameter in a next power base window of the power base window;
a control unit 605 for controlling the emission of nitrogen oxides of the engine according to the parameter amount in the next power base window.
In an embodiment of the present invention, based on the foregoing solution, optionally, the first calculating unit 602 includes:
the first calculating subunit is used for calculating a sliding average value of each parameter item in the state parameters of the engine in each preset sub-power base window; the state parameters comprise at least one parameter item of SCR temperature, engine speed, engine torque, original emission of nitrogen oxides of an engine and emission of nitrogen oxides of an engine tail; the engine raw exhaust refers to raw exhaust materials of the engine which are not subjected to aftertreatment;
and the second calculation subunit is used for determining that each sub-power base window meets the preset effective condition, and carrying out exponential weighted moving average on the sliding average value of each parameter item of each sub-power base window of each power base window by each sub-power base window group to obtain the window specific discharge amount of the nitrogen oxides of the engine tail emission under the power base window.
In an embodiment of the present invention, based on the foregoing solution, optionally, in a case where the window specific discharge is greater than an upper limit value of the specific discharge interval, the second calculating unit 604 is configured to:
subtracting a preset first fixed adjustment factor from the parameter quantity under the power base window to obtain the parameter quantity of the control parameter in the next power base window of the power base window.
In an embodiment of the present invention, based on the foregoing solution, optionally, in a case where the window specific emission is smaller than a lower limit value of the specific emission interval, the second calculating unit 604 is configured to:
and adding a preset second fixed adjustment factor to the parameter quantity under the power base window to obtain the parameter quantity of the control parameter in the next power base window of the power base window.
In an embodiment of the present invention, based on the foregoing solution, optionally, the first calculating unit 602 includes:
the first calculating subunit is used for calculating a sliding average value of each parameter item in the state parameters of the engine in each preset sub-power base window; the state parameters comprise at least one parameter item of SCR temperature, engine speed, engine torque, original emission of nitrogen oxides of an engine and emission of nitrogen oxides of an engine tail; the engine raw exhaust refers to raw exhaust materials of the engine which are not subjected to aftertreatment;
and the second calculation subunit is used for determining that each sub-power base window meets the preset effective condition, and carrying out exponential weighted moving average on the sliding average value of each parameter item of each sub-power base window of each power base window by each sub-power base window group to obtain the window specific discharge amount of the nitrogen oxides of the engine tail emission under the power base window.
In an embodiment of the present invention, based on the foregoing solution, optionally, the second computing subunit includes:
the first judging submodule is used for judging whether the accumulated power of each sub-power base window meets a preset accumulated power threshold value or not;
the second judging submodule is used for judging whether the sliding average value of each parameter item of each sub-power base window is in a threshold value interval corresponding to the parameter item;
and the determining submodule is used for determining that the sub-power base window meets the preset effective condition if the judging results are yes.
The above device, optionally, further comprises:
and the execution unit is used for taking the parameter quantity of the control parameter in the power base window to which the window specific discharge belongs as the parameter quantity of the control parameter in the next power base window of the power base window under the condition that the window specific discharge is in a preset specific discharge interval.
The specific principle and implementation process of each unit and module in the control device for engine nitrogen oxide emission disclosed in the above embodiment of the present invention are the same as the control method for engine nitrogen oxide emission disclosed in the above embodiment of the present invention, and may refer to the corresponding parts in the control method for engine nitrogen oxide emission provided in the above embodiment of the present invention, and will not be described herein again.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other. For the apparatus class embodiments, the description is relatively simple as it is substantially similar to the method embodiments, and reference is made to the description of the method embodiments for relevant points.
Finally, it is further noted that relational terms such as first and second, and the like are 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
For convenience of description, the above devices are described as being functionally divided into various units, respectively. Of course, the functions of each element may be implemented in the same piece or pieces of software and/or hardware when implementing the present invention.
From the above description of embodiments, it will be apparent to those skilled in the art that the present invention may be implemented in software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the embodiments or some parts of the embodiments of the present invention.
The foregoing has outlined a detailed description of a method for controlling emissions of nitrogen oxides in an engine, wherein specific examples are provided herein to illustrate the principles and embodiments of the present invention, and the above examples are provided to assist in understanding the method and core concepts of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (10)
1. A method for controlling emissions of nitrogen oxides from an engine, comprising:
acquiring state parameters of an engine under the condition that the running state of the engine meets preset control conditions;
calculating the window specific emission of nitrogen oxides in the tail row of the engine according to the state parameters; the engine tail refers to post-treated emissions of the engine;
acquiring the parameter quantity of the control parameter of the engine in a power base window to which the window specific discharge belongs under the condition that the window specific discharge is not in a preset specific discharge interval;
calculating the parameter of the control parameter in the next power base window of the power base window according to the parameter in the power base window and a preset fixed adjustment factor;
and controlling the emission of nitrogen oxides of the engine according to the parameter quantity in the next power base window.
2. The method of claim 1, wherein said calculating a window specific emission of oxides of nitrogen in an engine tail from said state parameter comprises:
calculating a sliding average value of each parameter item in the state parameters of the engine in each preset sub-power base window; the state parameters comprise at least one parameter item of SCR temperature, engine speed, engine torque, original emission of nitrogen oxides of an engine and emission of nitrogen oxides of an engine tail; the engine raw exhaust refers to raw exhaust materials of the engine which are not subjected to aftertreatment;
under the condition that each sub-power base window meets the preset effective condition, the sub-power base windows are used for successful base windows, and the sliding average value of each parameter item of each sub-power base window of the power base window is subjected to exponential weighted moving average to obtain the window specific discharge of the nitrogen oxides of the engine tail emission under the power base window.
3. The method of claim 2, wherein determining that each sub-power-base window meets a preset effective condition comprises:
judging whether the accumulated power of each sub-power base window meets a preset accumulated power threshold value or not;
judging whether the sliding average value of each parameter item of each sub-power base window is in a threshold value interval corresponding to the parameter item;
if the judging results are yes, determining that the sub-power base window meets the preset effective condition.
4. The method according to claim 1, wherein, in the case that the window specific emission is greater than the upper limit value of the specific emission interval, the calculating the parameter amount of the control parameter in the next power base window of the power base window according to the parameter amount of the power base window and a preset fixed adjustment factor includes:
subtracting a preset fixed adjustment factor from the parameter quantity under the power base window to obtain the parameter quantity of the control parameter in the next power base window of the power base window.
5. The method according to claim 1, wherein, in the case that the specific emission amount of the window is smaller than the lower limit value of the specific emission amount interval, the calculating the parameter amount of the control parameter in the next power base window of the power base window according to the parameter amount of the power base window and a preset fixed adjustment factor includes:
and adding a preset fixed adjustment factor to the parameter quantity under the power base window to obtain the parameter quantity of the control parameter in the next power base window of the power base window.
6. The method as recited in claim 1, further comprising:
and under the condition that the window specific discharge is in a preset specific discharge interval, taking the parameter quantity of the control parameter in a power base window to which the window specific discharge belongs as the parameter quantity of the control parameter in a next power base window of the power base window.
7. A control device for engine nitrogen oxide emissions, comprising:
the first acquisition unit is used for acquiring state parameters of the engine under the condition that the running state of the engine meets the preset control condition;
a first calculation unit for calculating a window specific emission of nitrogen oxides in the tail line of the engine according to the state parameter; the engine tail refers to post-treated emissions of the engine;
the second acquisition unit is used for acquiring the parameter quantity of the control parameter of the engine in the power base window to which the window specific discharge belongs under the condition that the window specific discharge is not in a preset specific discharge interval;
the second calculation unit is used for calculating the parameter quantity of the control parameter in the next power base window of the power base window according to the parameter quantity under the power base window and a preset fixed adjustment factor;
and the control unit is used for controlling the emission of nitrogen oxides of the engine according to the parameter quantity in the next power base window.
8. The apparatus of claim 7, wherein the first computing unit comprises:
the first calculating subunit is used for calculating a sliding average value of each parameter item in the state parameters of the engine in each preset sub-power base window; the state parameters comprise at least one parameter item of SCR temperature, engine speed, engine torque, original emission of nitrogen oxides of an engine and emission of nitrogen oxides of an engine tail; the engine raw exhaust refers to raw exhaust materials of the engine which are not subjected to aftertreatment;
and the second calculation subunit is used for determining that each sub-power base window meets the preset effective condition, and carrying out exponential weighted moving average on the sliding average value of each parameter item of each sub-power base window of each power base window by each sub-power base window group to obtain the window specific discharge amount of the nitrogen oxides of the engine tail emission under the power base window.
9. The apparatus according to claim 7, wherein in the case where the window specific discharge is greater than an upper limit value of the specific discharge interval, the second calculation unit is configured to:
subtracting a preset first fixed adjustment factor from the parameter quantity under the power base window to obtain the parameter quantity of the control parameter in the next power base window of the power base window.
10. The apparatus according to claim 7, wherein in the case where the window specific discharge is smaller than a lower limit value of the specific discharge interval, the second calculation unit is configured to:
and adding a preset second fixed adjustment factor to the parameter quantity under the power base window to obtain the parameter quantity of the control parameter in the next power base window of the power base window.
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