CN112282950A - Oxynitride discharge control method, vehicle, and storage medium - Google Patents
Oxynitride discharge control method, vehicle, and storage medium Download PDFInfo
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- CN112282950A CN112282950A CN202011200697.9A CN202011200697A CN112282950A CN 112282950 A CN112282950 A CN 112282950A CN 202011200697 A CN202011200697 A CN 202011200697A CN 112282950 A CN112282950 A CN 112282950A
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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
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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
- F02D41/0002—Controlling intake air
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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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
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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
- F02D41/30—Controlling fuel injection
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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
- F02D41/0002—Controlling intake air
- F02D2041/0017—Controlling intake air by simultaneous control of throttle and exhaust gas recirculation
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention discloses a nitrogen oxide emission control method, a vehicle and a storage medium, wherein the method comprises the following steps: acquiring the actual emission of oxynitride when the diesel engine operates; calculating the difference value between the actual discharge amount of the oxynitride and the preset target discharge amount of the oxynitride; judging whether the difference value is within a preset range; when the difference value is not in a preset range, respectively adjusting each current combustion parameter of the diesel engine according to a preset mapping relation table between each combustion parameter and the difference value; and controlling the diesel engine to operate according to the adjusted combustion parameter values, and returning to the step of obtaining the actual emission of the oxynitride when the diesel engine operates until the difference is within a preset range. The invention solves the problem that the existing diesel engine still adopts a fixed combustion parameter combination control strategy when the internal structure changes, which can cause the nitrogen oxide emission to not reach the standard.
Description
Technical Field
The invention relates to the field of vehicle control, in particular to a nitrogen oxide emission control method, a vehicle and a computer readable storage medium.
Background
In the development process of a national six-diesel engine, the original diesel engine emission control is one of the most studied directions of each host factory, at present, the original diesel engine emission control is mainly characterized in that combustion parameters under various working conditions are calibrated, the parameters comprise an oil injection advance angle, fuel pressure, a pre-injection quantity, a post-injection quantity, a pre-injection angle, a post-injection angle, EGR (Exhaust Gas Recirculation) opening degree, an air inlet throttle valve opening degree and the like, and an optimal combustion parameter combination under each working condition is found according to the performance of the engine, so that when the engine runs under each working condition, emission pollutants such as oil consumption, nitrogen oxides, smoke intensity and the like are controlled within engineering indexes. However, when the engine is running, such fixed combustion parameter combination control strategy may achieve a poor emissions result when air filter blockage, supercharger misalignment, or intake and exhaust line changes occur.
Disclosure of Invention
The invention mainly aims to provide a nitrogen oxide emission control method, a vehicle and a computer readable storage medium, aiming at solving the problem that the nitrogen oxide emission does not reach the standard due to the fact that a fixed combustion parameter combination control strategy is still adopted when the internal structure of a diesel engine changes.
To achieve the above object, the present invention provides a nitrogen oxide emission control method, comprising the steps of:
acquiring the actual emission of oxynitride when the diesel engine operates;
calculating the difference value between the actual discharge amount of the oxynitride and the preset target discharge amount of the oxynitride;
judging whether the difference value is within a preset range;
when the difference value is not in a preset range, respectively adjusting each current combustion parameter of the diesel engine according to a preset mapping relation table between each combustion parameter and the difference value, wherein the combustion parameters comprise an oil injection advance angle, fuel pressure, a pre-injection quantity, a post-injection quantity, an opening degree of a waste gas recirculation valve and an opening degree of an air inlet throttle valve;
and controlling the diesel engine to operate according to the adjusted combustion parameters, and returning to the step of obtaining the actual emission of the oxynitride when the diesel engine operates until the difference is within a preset range.
Optionally, the combustion parameter is an oil injection advance angle; the step of respectively adjusting the current combustion parameters of the diesel engine according to the preset mapping relation table between each combustion parameter and the difference value comprises the following steps:
acquiring an oil injection advance angle corresponding to the difference value according to a preset mapping relation table between the oil injection advance angle and the difference value;
and adjusting the current oil injection advance angle of the diesel engine to the oil injection advance angle corresponding to the difference value.
Optionally, the step of adjusting each current combustion parameter of the diesel engine according to a preset mapping table between each combustion parameter and the difference comprises:
acquiring fuel pressure corresponding to the difference value according to a preset mapping relation table between the fuel pressure and the difference value;
and adjusting the current fuel pressure of the diesel engine to the fuel pressure corresponding to the difference value.
Optionally, the step of adjusting each current combustion parameter of the diesel engine according to a preset mapping table between each combustion parameter and the difference comprises:
obtaining the pre-injection oil quantity corresponding to the difference value according to a preset mapping relation table between the pre-injection oil quantity and the difference value;
and adjusting the current pre-injection quantity of the diesel engine to the pre-injection quantity corresponding to the difference value.
Optionally, the combustion parameter is post-injection amount; the step of respectively adjusting the current combustion parameters of the diesel engine according to the preset mapping relation table between each combustion parameter and the difference value comprises the following steps:
obtaining the post-injection quantity corresponding to the difference value according to a preset mapping relation table between the post-injection quantity and the difference value;
and adjusting the current post-injection quantity of the diesel engine to the post-injection quantity corresponding to the difference value.
Optionally, the combustion parameter is an exhaust gas recirculation valve opening; the step of respectively adjusting the current combustion parameters of the diesel engine according to the preset mapping relation table between each combustion parameter and the difference value comprises the following steps:
according to a preset mapping relation table between the opening of the waste gas recirculation valve and the difference value, obtaining the opening of the waste gas recirculation valve corresponding to the difference value;
and adjusting the current opening of the exhaust gas recirculation valve of the diesel engine to the opening of the exhaust gas recirculation valve corresponding to the difference value.
Optionally, the combustion parameter is an intake throttle opening; the step of respectively adjusting the current combustion parameters of the diesel engine according to the preset mapping relation table between each combustion parameter and the difference value comprises the following steps:
obtaining the opening degree of the air inlet throttle valve corresponding to the difference value according to a preset mapping relation table between the opening degree of the air inlet throttle valve and the difference value;
and adjusting the current opening of the air inlet throttle valve of the diesel engine to the opening of the air inlet throttle valve corresponding to the difference value.
Optionally, the step of obtaining the actual emission amount of the nitrogen oxide compounds when the diesel engine operates is preceded by:
acquiring the current working condition of the diesel engine, and judging whether the diesel engine stably operates or not according to the current working condition and the preset stable operation working condition;
the step of acquiring the actual emission amount of the oxynitride when the diesel engine is running comprises the following steps:
and when the diesel engine is determined to be stably operated, acquiring the actual emission of the oxynitride when the diesel engine is stably operated.
To achieve the above object, the present invention also provides a vehicle comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the nox emission control method as described above.
To achieve the above object, the present invention also provides a computer-readable storage medium having stored thereon a computer program which, when being executed by a processor, implements the steps of the nitrogen oxide emission control method as described above.
According to the oxynitride discharge control method, the vehicle and the computer readable storage medium, the actual discharge amount of oxynitride during the operation of the diesel engine is obtained; calculating the difference value between the actual discharge amount of the oxynitride and the preset target discharge amount of the oxynitride; judging whether the difference value is within a preset range; when the difference value is not in a preset range, respectively adjusting each current combustion parameter of the diesel engine according to a preset mapping relation table between each combustion parameter and the difference value, wherein the combustion parameters comprise an oil injection advance angle, fuel pressure, a pre-injection quantity, a post-injection quantity, an opening degree of a waste gas recirculation valve and an opening degree of an air inlet throttle valve; and controlling the diesel engine to operate according to the adjusted combustion parameter values, and returning to the step of obtaining the actual emission of the oxynitride when the diesel engine operates until the difference is within a preset range. Therefore, when the air filter is blocked, the supercharger deviates or the exhaust pipeline changes to cause the deviation of the exhaust in the running process of the vehicle, the combustion parameters can be adaptively adjusted according to the deviation, so that the exhaust is adjusted to be within the set target range.
Drawings
FIG. 1 is a schematic diagram of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a first embodiment of a NOx emission control method of the present invention;
FIG. 3 is a schematic flow chart of a nitrogen oxide emission control method according to a second embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a hardware structure of a vehicle according to various embodiments of the present invention. The vehicle comprises a communication module 01, a memory 02, a processor 03 and the like. Those skilled in the art will appreciate that the vehicle shown in FIG. 1 may also include more or fewer components than shown, or some components may be combined, or a different arrangement of components. The processor 03 is connected to the memory 02 and the communication module 01, respectively, and the memory 02 stores a computer program, which is executed by the processor 03 at the same time.
The communication module 01 may be connected to an external device through a network. The communication module 01 may receive data sent by an external device, and may also send data, instructions, and information to the external device, where the external device may be an electronic device such as a mobile phone, a tablet computer, a notebook computer, and a desktop computer.
The memory 02 may be used to store software programs and various data. The memory 02 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program (acquiring an actual emission amount of nitrogen oxides during operation of the diesel engine) required by at least one function, and the like; the storage data area may store data or information created according to the use of the vehicle, or the like. Further, the memory 02 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
The processor 03, which is a control center of the vehicle, connects various parts of the entire vehicle using various interfaces and lines, and performs various functions of the vehicle and processes data by operating or executing software programs and/or modules stored in the memory 02 and calling data stored in the memory 02, thereby integrally monitoring the vehicle. Processor 03 may include one or more processing units; preferably, the processor 03 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 03.
Although not shown in fig. 1, the vehicle may further include a circuit control module, where the circuit control module is configured to be connected to a mains power supply to implement power control and ensure normal operation of other components.
Those skilled in the art will appreciate that the vehicle configuration shown in FIG. 1 does not constitute a limitation of the vehicle, and may include more or fewer components than shown, or some components in combination, or a different arrangement of components.
Various embodiments of the method of the present invention are presented in terms of the above-described hardware architecture.
Referring to fig. 2, in a first embodiment of the nitrogen oxide emission control method of the present invention, the nitrogen oxide emission control method includes the steps of:
step S10, acquiring the actual emission of oxynitride when the diesel engine runs;
in the scheme, the nitrogen oxide detection device is fixed near the tail end exhaust pipe of the diesel engine, the nitrogen oxide detection device is started simultaneously when the diesel engine is started, or the nitrogen oxide detection device is started after the diesel engine is started for a period of time or when the running working condition of the diesel engine reaches the preset working condition. The discharge amount of the oxynitride is related to the structure of the diesel engine and combustion parameters during operation, when the oil extraction machine of the vehicle operates, the central control system of the vehicle acquires the actual discharge amount of the oxynitride discharged during the operation of the diesel engine, wherein the actual discharge amount of the oxynitride can be acquired by the oxynitride detection device actively, and the acquired actual discharge amount of the oxynitride can also be uploaded actively by the oxynitride. The nitrogen oxide detection device can collect the discharge amount of nitrogen oxide in real time and can also collect the discharge amount of nitrogen oxide according to a preset sampling frequency.
Step S20, calculating the difference between the actual emission amount of the oxynitride and the preset target emission amount of the oxynitride;
after the central control system of the vehicle obtains the emission amount of the oxynitride, the difference value between the actual emission amount of the oxynitride and the preset target emission amount of the oxynitride is calculated, wherein the preset target emission amount of the oxynitride can be set by a manufacturer, and the value of the preset target emission amount of the oxynitride is within the range of national emission standards.
Step S30, judging whether the difference value is in a preset range;
after the difference between the actual emission amount of the nitrogen oxide and the preset target emission amount of the nitrogen oxide is obtained, whether the difference is within a preset range or not is judged. When the difference is determined not to be within the preset range, the current operating combustion parameters of the diesel engine need to be adjusted to change the actual emission of the oxynitride of the diesel engine, so that the difference between the two is within the preset range. One of the two situations is that the actual emission is greater than the target emission, and the difference between the actual emission and the target emission is higher than the upper limit of the preset range, in which case, the actual emission already exceeds the national emission standard, and the combustion parameters of the diesel engine need to be adjusted to reduce the emission of nitrogen oxides of the diesel engine to within the allowable emission range. In another case, the actual emission is less than the target emission, and the difference between the actual emission and the target emission is lower than the lower limit of the preset range, and the actual emission is still within the range of the national emission standard and is far higher than the national standard requirement. And when the current combustion parameter is determined to be within the preset range, the current combustion parameter of the diesel engine does not need to be adjusted, and the diesel engine is still kept to operate according to the current combustion parameter.
Step S40, when the difference is not in the preset range, respectively adjusting each current combustion parameter of the diesel engine according to a preset mapping relation table between each combustion parameter and the difference, wherein the combustion parameters comprise an oil injection advance angle, fuel pressure, a pre-injection quantity, a post-injection quantity, an opening degree of a waste gas recirculation valve and an opening degree of an air inlet throttle valve;
the vehicle stores a mapping relation table between preset difference values and combustion parameters, namely, the mapping relation table between the combustion parameters and the difference values is preset for each combustion parameter. When the difference is determined not to be within the preset range, the preset mapping relation table of each combustion parameter between the differences is called respectively, and then each combustion parameter corresponding to the difference is inquired in each mapping relation table to serve as the adjusted combustion parameter. And adjusting the current combustion parameter values of the diesel engine according to the inquired combustion parameters.
In the present embodiment, the combustion parameters include an injection advance angle, a fuel pressure, a pilot injection amount, a post injection amount, an exhaust gas recirculation valve opening degree, and an intake throttle valve opening degree. The six combustion parameters respectively have corresponding preset mapping relation tables of the combustion parameters between the difference values, namely a preset mapping relation table between an oil injection advance angle and the difference value, a preset mapping relation table between a fuel pressure and the difference value, a preset mapping relation table between a preset oil injection quantity and the difference value, a preset mapping relation table between a post-injection quantity and the difference value, a preset mapping relation table between a waste recycling opening degree and the difference value and a preset mapping relation table between an air inlet throttle opening degree and the difference value.
Specifically, step S40 includes:
step S411, acquiring an oil injection advance angle corresponding to the difference value according to a preset mapping relation table between the oil injection advance angle and the difference value;
and step S412, adjusting the current oil injection advance angle of the diesel engine to the oil injection advance angle corresponding to the difference value.
And when the difference is determined not to be in the preset range, calling a preset mapping relation table between the oil injection advance angle and the difference, and inquiring the oil injection advance angle corresponding to the currently obtained difference in the table to serve as the parameter to be adjusted. After the fuel injection advance angle corresponding to the difference value is obtained through inquiry, the current fuel injection advance angle of the diesel engine is adjusted to the fuel injection advance angle corresponding to the difference value. For example, if the fuel injection advance angle corresponding to the difference obtained by inquiry is 40 degrees, and the current fuel injection advance angle of the diesel engine is 30 degrees, the fuel injection advance angle of the diesel engine is adjusted from 30 degrees to 40 degrees.
It should be noted that, before the adjustment, it is determined whether the fuel injection advance angle corresponding to the difference is the same as the current fuel injection advance angle of the diesel engine before the adjustment, and if the fuel injection advance angle corresponding to the difference obtained by the query is the same as the current fuel injection advance angle of the diesel engine before the adjustment, the adjustment is not performed. If different, the adjustment is performed.
Specifically, step S40 includes:
step S421, obtaining the fuel pressure corresponding to the difference value according to a preset mapping relation table between the fuel pressure and the difference value;
and step S422, adjusting the current fuel pressure of the diesel engine to the fuel pressure corresponding to the difference value.
And when the difference is determined not to be in the preset range, calling a preset mapping relation table between the fuel pressure and the difference, and inquiring the fuel pressure corresponding to the currently obtained difference in the table to serve as the parameter to be adjusted. After the fuel pressure corresponding to the difference is obtained through inquiry, the current fuel pressure of the diesel engine is adjusted to the fuel pressure corresponding to the difference.
It should be noted that, before the adjustment, it is determined whether the fuel pressure corresponding to the difference is the same as the current fuel pressure of the diesel engine before the adjustment, and if the fuel pressure corresponding to the difference obtained by the query is the same as the current fuel pressure of the diesel engine before the adjustment, the adjustment is not performed. If different, the adjustment is performed.
Specifically, step S40 includes:
step S431, obtaining the pre-injection quantity corresponding to the difference value according to a preset mapping relation table between the pre-injection quantity and the difference value;
and S432, adjusting the current pre-injection quantity of the diesel engine to the pre-injection quantity corresponding to the difference value.
And when the difference is determined not to be in the preset range, calling a preset mapping relation table between the pre-injection quantity and the difference, and inquiring the pre-injection quantity corresponding to the currently obtained difference in the table to serve as the parameter to be adjusted. After the pre-injection quantity corresponding to the difference value is obtained through inquiry, the current pre-injection quantity of the diesel engine is adjusted to be the pre-injection quantity corresponding to the difference value.
It should be noted that, before the adjustment, it is determined whether the pilot injection quantity corresponding to the difference is the same as the current pilot injection quantity of the diesel engine before the adjustment, and if the pilot injection quantity corresponding to the difference obtained by the query is the same as the current pilot injection quantity of the diesel engine before the adjustment, the adjustment is not performed. If different, the adjustment is performed.
Specifically, step S40 includes:
step S441, obtaining the post-injection oil quantity corresponding to the difference value according to a preset mapping relation table between the post-injection oil quantity and the difference value;
and step S442, adjusting the current post-injection quantity of the diesel engine to the post-injection quantity corresponding to the difference value.
And when the difference is determined not to be in the preset range, calling a preset mapping relation table between the post-injection oil quantity and the difference, and inquiring the post-injection oil quantity corresponding to the currently obtained difference in the table to serve as the parameter to be adjusted. And after the post-injection oil quantity corresponding to the difference value is obtained through inquiry, the current post-injection oil quantity of the diesel engine is adjusted to be the post-injection oil quantity corresponding to the difference value.
It should be noted that before the adjustment, it is determined whether the post-injection amount corresponding to the difference is the same as the current post-injection amount of the diesel engine before the adjustment, and if the post-injection amount corresponding to the difference obtained by the query is the same as the current post-injection amount of the diesel engine before the adjustment, the adjustment is not performed. If different, the adjustment is performed.
Specifically, step S40 includes:
step S451, obtaining the opening degree of the waste gas recirculation valve corresponding to the difference value according to a preset mapping relation table between the opening degree of the waste gas recirculation valve and the difference value;
and step S452, adjusting the opening of the current exhaust gas recirculation valve of the diesel engine to the opening of the exhaust gas recirculation valve corresponding to the difference value.
And when the difference is determined not to be within the preset range, calling a preset mapping relation table between the opening of the waste recirculation valve and the difference, and inquiring the opening of the waste recirculation valve corresponding to the currently obtained difference in the table to serve as a parameter to be adjusted. After the opening of the waste recirculation valve corresponding to the difference value is obtained through inquiry, the opening of the current waste recirculation valve of the diesel engine is adjusted to the opening of the waste recirculation valve corresponding to the difference value.
Before the adjustment, it is determined whether the opening of the waste recirculation valve corresponding to the difference is the same as the opening of the current waste recirculation valve of the diesel engine before the adjustment, and if the opening of the waste recirculation valve corresponding to the difference obtained by the query is the same as the opening of the current waste recirculation valve of the diesel engine before the adjustment, the adjustment is not performed. If different, the adjustment is performed.
Specifically, step S40 includes:
step S461, obtaining the air inlet throttle opening corresponding to the difference value according to a preset mapping relation table between the air inlet throttle opening and the difference value;
and step S462, adjusting the current opening of the air inlet throttle valve of the diesel engine to the opening of the air inlet throttle valve corresponding to the difference value.
And when the difference is determined not to be within the preset range, calling a preset mapping relation table between the opening degree of the intake throttle valve and the difference, and inquiring the opening degree of the intake throttle valve corresponding to the currently obtained difference in the table to serve as a parameter to be adjusted. After the air inlet throttle opening corresponding to the difference value is obtained through inquiry, the current air inlet throttle opening of the diesel engine is adjusted to the air inlet throttle opening corresponding to the difference value.
Before the adjustment, it is determined whether the opening degree of the intake throttle valve corresponding to the difference is the same as the current opening degree of the intake throttle valve of the diesel engine before the adjustment, and if the opening degree of the intake throttle valve corresponding to the difference obtained by the query is the same as the current opening degree of the intake throttle valve of the diesel engine before the adjustment, the adjustment is not performed. If different, the adjustment is performed.
And step S50, controlling the diesel engine to operate according to the adjusted combustion parameter values, and returning to the step of obtaining the actual emission of the oxynitride when the diesel engine operates until the difference is within a preset range.
After adjusting each combustion parameter of the diesel engine, controlling the diesel engine to operate according to each adjusted combustion parameter, monitoring the actual emission of oxynitride of the diesel engine in the process of operating according to the adjusted combustion parameter, determining whether the difference value between the actual emission and the target emission of oxynitride after the combustion parameter is adjusted is within a preset range, and if not, continuing to adjust until the difference value between the actual emission and the target emission is within the preset range.
In this embodiment, the scheme of steps S10-S50 may be executed every time the nox detection device acquires an emission amount of nox according to the sampling frequency during the operation of the diesel engine, but this may cause the combustion parameter to be adjusted too frequently, and the scheme of steps S10-S50 may be executed after acquiring an average value of the acquired preset number of the emissions amounts of nox every time the nox detection device acquires more than a preset number of the emissions amounts of nox, the average value being the actual emission amount of nox during the operation of the oil extraction engine.
The actual discharge amount of the oxynitride during the operation of the diesel engine is obtained; calculating the difference value between the actual discharge amount of the oxynitride and the preset target discharge amount of the oxynitride; judging whether the difference value is within a preset range; when the difference value is not in a preset range, respectively adjusting each current combustion parameter of the diesel engine according to a preset mapping relation table between each combustion parameter and the difference value, wherein the combustion parameters comprise an oil injection advance angle, fuel pressure, a pre-injection quantity, a post-injection quantity, an opening degree of a waste gas recirculation valve and an opening degree of an air inlet throttle valve; and controlling the diesel engine to operate according to the adjusted combustion parameter values, and returning to the step of obtaining the actual emission of the oxynitride when the diesel engine operates until the difference is within a preset range. Therefore, when the air filter is blocked, the supercharger deviates or the exhaust pipeline changes to cause the deviation of the exhaust in the running process of the vehicle, the combustion parameters can be adaptively adjusted according to the deviation, so that the exhaust is adjusted to be within the set target range.
Further, referring to fig. 3, fig. 3 is a second embodiment of the nox emission control method according to the first embodiment of the present application, and in this embodiment, step S10 is preceded by:
step S60, acquiring the current working condition of the diesel engine, and judging whether the diesel engine stably runs or not according to the current working condition and the preset stable running working condition;
step S10 includes:
and step S11, when the diesel engine is determined to be in stable operation, acquiring the actual emission amount of the oxynitride in the stable operation of the diesel engine.
In this embodiment, before the actual emission of oxynitrides of the diesel engine is obtained, the current working condition of the diesel engine is obtained first, and then comparison and judgment are performed according to the current working condition and the preset stable operation working condition, so as to determine whether the current diesel engine is in the stable operation working condition. And when the diesel engine is determined to be in a stable operation condition, acquiring the actual emission of the oxynitride of the diesel engine, and executing the subsequent steps. Even if the nitrogen oxide detection device still collects the actual emission of nitrogen oxide when the diesel engine is not in a stable operation condition, the actual emission of nitrogen oxide collected under the condition is not compared with the target emission to be used as the basis for adjusting the combustion parameters.
Because the discharge amount of the nitrogen oxide detected by the diesel engine is representative when the diesel engine operates stably, in the embodiment, before the actual discharge amount of the nitrogen oxide is obtained, whether the diesel engine is in a stable operation state is determined, and only in the stable operation state, the actual discharge amount of the nitrogen oxide is obtained, so that the combustion parameter of the diesel engine is adjusted according to the obtained actual discharge amount of the nitrogen oxide, and therefore, the adjustment result is ensured to be effective.
The invention also proposes a computer-readable storage medium on which a computer program is stored. The computer-readable storage medium may be the Memory 02 in the vehicle of fig. 1, and may also be at least one of a ROM (Read-Only Memory)/RAM (Random Access Memory), a magnetic disk, and an optical disk, and the computer-readable storage medium includes several pieces of information for causing the vehicle to perform the method according to the embodiments of the present invention.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system 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 system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A nitrogen oxide emission control method, comprising the steps of:
acquiring the actual emission of oxynitride when the diesel engine operates;
calculating the difference value between the actual discharge amount of the oxynitride and the preset target discharge amount of the oxynitride;
judging whether the difference value is within a preset range;
when the difference value is not in a preset range, respectively adjusting each current combustion parameter of the diesel engine according to a preset mapping relation table between each combustion parameter and the difference value, wherein the combustion parameters comprise an oil injection advance angle, fuel pressure, a pre-injection quantity, a post-injection quantity, an opening degree of a waste gas recirculation valve and an opening degree of an air inlet throttle valve;
and controlling the diesel engine to operate according to the adjusted combustion parameters, and returning to the step of obtaining the actual emission of the oxynitride when the diesel engine operates until the difference is within a preset range.
2. The nox emission control method according to claim 1, wherein the combustion parameter is an injection advance angle; the step of respectively adjusting the current combustion parameters of the diesel engine according to the preset mapping relation table between each combustion parameter and the difference value comprises the following steps:
acquiring an oil injection advance angle corresponding to the difference value according to a preset mapping relation table between the oil injection advance angle and the difference value;
and adjusting the current oil injection advance angle of the diesel engine to the oil injection advance angle corresponding to the difference value.
3. The nox emission control method according to claim 1, wherein the combustion parameter is a fuel pressure, and the step of adjusting each of the current combustion parameters of the diesel engine according to the preset mapping table between each of the combustion parameters and the difference comprises:
acquiring fuel pressure corresponding to the difference value according to a preset mapping relation table between the fuel pressure and the difference value;
and adjusting the current fuel pressure of the diesel engine to the fuel pressure corresponding to the difference value.
4. The nox emission control method according to claim 1, wherein the combustion parameter is a pilot injection amount, and the step of adjusting each of the current combustion parameters of the diesel engine according to the preset mapping table between each of the combustion parameters and the difference comprises:
obtaining the pre-injection oil quantity corresponding to the difference value according to a preset mapping relation table between the pre-injection oil quantity and the difference value;
and adjusting the current pre-injection quantity of the diesel engine to the pre-injection quantity corresponding to the difference value.
5. The nox emission control method as claimed in claim 1, wherein the combustion parameter is a post-injection amount of oil; the step of respectively adjusting the current combustion parameters of the diesel engine according to the preset mapping relation table between each combustion parameter and the difference value comprises the following steps:
obtaining the post-injection quantity corresponding to the difference value according to a preset mapping relation table between the post-injection quantity and the difference value;
and adjusting the current post-injection quantity of the diesel engine to the post-injection quantity corresponding to the difference value.
6. The nox emission control method according to claim 1, wherein the combustion parameter is an exhaust gas recirculation valve opening degree; the step of respectively adjusting the current combustion parameters of the diesel engine according to the preset mapping relation table between each combustion parameter and the difference value comprises the following steps:
according to a preset mapping relation table between the opening of the waste gas recirculation valve and the difference value, obtaining the opening of the waste gas recirculation valve corresponding to the difference value;
and adjusting the current opening of the exhaust gas recirculation valve of the diesel engine to the opening of the exhaust gas recirculation valve corresponding to the difference value.
7. The nox emission control method according to claim 1, wherein the combustion parameter is an intake throttle opening degree; the step of respectively adjusting the current combustion parameters of the diesel engine according to the preset mapping relation table between each combustion parameter and the difference value comprises the following steps:
obtaining the opening degree of the air inlet throttle valve corresponding to the difference value according to a preset mapping relation table between the opening degree of the air inlet throttle valve and the difference value;
and adjusting the current opening of the air inlet throttle valve of the diesel engine to the opening of the air inlet throttle valve corresponding to the difference value.
8. The nitrogen oxide emission control method according to any one of claims 1 to 7, wherein the step of obtaining an actual emission amount of nitrogen oxides when the diesel engine is operating is preceded by:
acquiring the current working condition of the diesel engine, and judging whether the diesel engine stably operates or not according to the current working condition and the preset stable operation working condition;
the step of acquiring the actual emission amount of the oxynitride when the diesel engine is running comprises the following steps:
and when the diesel engine is determined to be stably operated, acquiring the actual emission of the oxynitride when the diesel engine is stably operated.
9. A vehicle, characterized in that the vehicle comprises a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the nitrogen oxide emission control method according to any one of claims 1 to 8.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the nitrogen oxide emission control method according to any one of claims 1 to 8.
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