CN115306571B - Control method and control system for nitrogen oxide emission of gas engine - Google Patents
Control method and control system for nitrogen oxide emission of gas engine Download PDFInfo
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- CN115306571B CN115306571B CN202210790544.7A CN202210790544A CN115306571B CN 115306571 B CN115306571 B CN 115306571B CN 202210790544 A CN202210790544 A CN 202210790544A CN 115306571 B CN115306571 B CN 115306571B
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 354
- 239000007789 gas Substances 0.000 title claims abstract description 168
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000002737 fuel gas Substances 0.000 claims abstract description 44
- 230000001276 controlling effect Effects 0.000 description 23
- 238000005259 measurement Methods 0.000 description 7
- 239000000446 fuel Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 238000004880 explosion Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
- F02P5/15—Digital data processing
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0418—Air humidity
-
- 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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention discloses a control method for nitrogen oxide emission of a gas engine, and also discloses a control system for nitrogen oxide emission of the gas engine, wherein the control method comprises the following steps: acquiring an actual emission value of nitrogen oxides of the gas engine; according to the fact that the actual emission value of the nitrogen oxides exceeds the emission setting range, controlling and adjusting the flow ratio of the fuel gas to the air; according to the flow ratio of the fuel gas and the air, adjusting the flow ratio to a limit value in a preset proportion range, and controlling the ignition advance angle of the fuel gas engine to correct when the actual emission value of the nitrogen oxides exceeds an emission setting range; by the control method and the control system, the nitrogen oxide emission of the gas engine can be stably controlled; the adaptability of the gas engine to the ambient temperature and the atmospheric humidity can be improved, and the engine power performance and the economy are maintained while the NOx emission of the engine is met.
Description
Technical Field
The invention relates to the technical field of emission control of gas engines, in particular to a control method for nitrogen oxide emission of a gas engine and a control system for nitrogen oxide emission of the gas engine.
Background
This section provides merely background information related to the present disclosure and is not necessarily prior art.
At present, an oxygen sensor closed-loop control method is generally adopted when an engine runs, but when the temperature of intake air is reduced, combustion is advanced, and nitrogen oxides increase along with the reduction of the temperature of intake air, so that stable control of nitrogen oxide emission cannot be realized by the oxygen sensor closed-loop control method.
Further, the emission of engine nitrogen oxides is also greatly affected by the intake air humidity, and the emission of engine nitrogen oxides decreases with an increase in the atmospheric humidity, whereas the emission of engine nitrogen oxides increases when the atmospheric humidity decreases.
In the prior art, the control mode cannot stably control the emission of nitrogen oxides of the gas engine, and cannot control the emission of nitrogen oxides of the gas engine along with the temperature change and the humidity change of the atmosphere, so that the existing control method for the emission of nitrogen oxides of the engine needs to be improved.
Disclosure of Invention
The invention aims to at least solve the technical problem of how to stably control the emission of nitrogen oxides of a gas engine. The aim is achieved by the following technical scheme:
A first aspect of the present invention provides a control method of nitrogen oxide emission of a gas engine, the control method comprising: acquiring an actual emission value of nitrogen oxides of the gas engine; according to the fact that the actual emission value of the nitrogen oxides exceeds the emission setting range, controlling and adjusting the flow ratio of the fuel gas to the air; and adjusting the flow ratio of the fuel gas to the air to a limit value in a preset proportion range, and controlling the ignition advance angle of the fuel gas engine to correct when the actual emission value of the nitrogen oxides exceeds an emission setting range.
According to the control method for the emission of the nitrogen oxides of the gas engine, the flow ratio of the gas to the air is adjusted based on the actual emission value of the nitrogen oxides, so that the air-fuel ratio of the gas engine is controlled; after the air-fuel ratio of the gas engine is regulated, the actual emission value of the nitrogen oxides still exceeds the emission setting range, the ignition advance angle of the gas engine is corrected, and finally the stable control of the nitrogen oxide emission is realized.
In addition, the control method for nitrogen oxide emission of the gas engine according to the embodiment of the invention can also have the following additional technical characteristics:
In some embodiments of the present invention, the adjusting the flow ratio of the gas to the air to the limit value of the preset ratio range, and the actual emission value of the nitrogen oxides exceeds the emission setting range, controlling the ignition advance angle of the gas engine to correct, includes: the flow ratio of the fuel gas to the air is adjusted to the lower limit value of the preset proportion range, the actual emission value of the nitrogen oxides exceeds the emission setting range, and the ignition advance angle of the fuel gas engine is controlled to be reduced; and adjusting the flow ratio of the fuel gas to the air to the upper limit value of the preset proportion range, wherein the actual emission value of the nitrogen oxides exceeds the emission setting range, and controlling and increasing the ignition advance angle of the fuel gas engine.
In some embodiments of the present invention, controlling and adjusting the flow ratio of the fuel gas to the air according to the actual emission value of the nitrogen oxides exceeding the emission setting range includes: reducing the gas flow of the gas engine according to the fact that the actual emission value of the nitrogen oxides is larger than the upper limit of the emission setting range; and increasing the gas flow of the gas engine according to the fact that the actual emission value of the nitrogen oxides is smaller than the lower limit of the emission setting range.
In some embodiments of the invention, the control method further comprises: acquiring an air inlet temperature value of a gas engine; and controlling the ignition advance angle of the gas engine to correct according to the comparison between the real-time air inlet temperature value and the preset air inlet temperature value.
In some embodiments of the present invention, the controlling the ignition advance angle of the gas engine to correct according to the real-time intake air temperature value compared with a preset intake air temperature value includes: controlling and increasing the ignition advance angle of the gas engine according to the fact that the real-time air inlet temperature value is higher than a preset air inlet temperature value; and controlling to reduce the ignition advance angle of the gas engine according to the fact that the real-time air inlet temperature value is lower than a preset air inlet temperature value.
In some embodiments of the invention, the control method includes: acquiring an intake humidity value of a gas engine; and controlling the ignition advance angle of the gas engine to correct according to the comparison of the air inlet humidity value and the preset air inlet humidity value.
In some embodiments of the present invention, the controlling the ignition advance angle of the gas engine to correct according to the intake air humidity value compared with a preset intake air humidity value includes: the air inlet humidity value is higher than a preset air inlet humidity value, and the ignition advance angle of the gas engine is controlled to be increased; and the air inlet humidity value is lower than a preset air inlet humidity value, and the ignition advance angle of the gas engine is controlled to be reduced.
A second aspect of the present invention provides a control system for nitrogen oxide emissions from a gas engine, the control system comprising: the nitrogen oxide sensor is arranged in an exhaust pipeline of the gas engine and is used for acquiring actual emission information of nitrogen oxides of the gas engine and sending the actual emission information to the control unit; the temperature and humidity sensor is arranged in an air inlet pipeline of the gas engine and used for acquiring real-time air inlet temperature information and real-time air inlet humidity information of the gas engine and sending the real-time air inlet temperature information and the real-time air inlet humidity information to the control unit; the control unit is used for receiving the actual emission information, the real-time air inlet temperature information and the real-time air inlet humidity information, acquiring an actual emission value of nitrogen oxides, an air inlet real-time temperature value and a real-time air inlet humidity value according to the actual emission information, the real-time air inlet temperature information and the real-time air inlet humidity information, controlling and adjusting the flow ratio of fuel gas and air according to the fact that the actual emission value of the nitrogen oxides exceeds an emission setting range, adjusting the flow ratio of the fuel gas and the air to a limit value in a preset proportion range according to the flow ratio of the fuel gas and the air, controlling the fact that the actual emission value of the nitrogen oxides exceeds the emission setting range, and correcting the ignition advance angle of the fuel gas engine.
In some embodiments of the present invention, the control unit controls the ignition advance angle of the gas engine to correct according to the comparison of the real-time intake air temperature value and a preset intake air temperature value until the ignition advance angle is adjusted to a magnitude matching the real-time intake air temperature value.
In some embodiments of the present invention, the control unit controls the ignition advance angle of the gas engine to correct according to the comparison of the real-time intake air humidity value and a preset intake air humidity value until the ignition advance angle is adjusted to a magnitude matching the real-time intake air humidity value.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a schematic diagram of NOx closed-loop control based on a NOx sensor according to one embodiment of the present invention;
FIG. 2 is a layout diagram of a control system according to one embodiment of the present invention;
FIG. 3 is a graph illustrating corrected spark advance MAP based on intake air temperature in accordance with an embodiment of the present invention;
FIG. 4 is a graph illustrating correction of spark advance based on intake air humidity MAP according to one embodiment of the invention.
Wherein, the reference numerals are as follows:
1. a gas valve;
2. A temperature and humidity sensor;
3. A mixer;
4.a booster compressor;
5.a supercharger turbine;
6. A nitrogen oxide sensor;
7. a throttle front intake pressure temperature sensor;
8. A throttle valve;
9. A post throttle pressure temperature sensor.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" are inclusive and therefore specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof.
Although the terms first, second, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and "third," and other numerical terms, when used herein, do not imply a sequence or order unless clearly indicated by the context. In addition, in the description of the present invention, unless explicitly stated and limited otherwise, the terms "disposed" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
For ease of description, spatially relative terms, such as "upper," "inner," "proximal," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Accordingly, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatially relative relationship descriptors used herein interpreted accordingly.
In some embodiments of the present invention, the present invention provides a method of controlling nitrogen oxide emissions from a gas engine, the method comprising: acquiring an actual emission value of nitrogen oxides of the gas engine; according to the fact that the actual emission value of the nitrogen oxides exceeds the emission setting range, controlling and adjusting the flow ratio of the fuel gas to the air; and adjusting the flow ratio of the fuel gas to the air to a limit value in a preset proportion range, and controlling the ignition advance angle of the fuel gas engine to correct when the actual emission value of the nitrogen oxides exceeds the emission setting range.
In one embodiment of the invention, the engine ECU compares the actual NOx emission measurement detected by the NOx sensor with a NOx emission preset value or range according to the actual NOx emission measurement, implements NOx closed-loop control adjustment by the PID controller, and controls the actual emission value of nitrogen oxides according to the closed-loop correction coefficient by adjusting the flow ratio of the gas and air of the gas engine until it is adjusted to coincide with the NOx emission set value or range.
In another embodiment of the invention, the actual emission value of the nitrogen oxides exceeds the emission set range, and is adjusted by adjusting the flow ratio of the fuel gas to the air of the fuel gas engine, in particular by: reducing the gas flow of the gas engine according to the fact that the actual emission value of the nitrogen oxides is larger than the upper limit of the emission setting range; and increasing the gas flow of the gas engine according to the fact that the actual emission value of the nitrogen oxides is smaller than the lower limit of the emission setting range.
As shown in fig. 1, the method for controlling the emission of nitrogen oxides of the gas engine provided by the invention has the following working processes:
acquiring an actual NOx measured value of the gas engine through a NOx sensor;
according to the engine ECU, based on the actual NOx measured value and the NOx set value, the closed-loop control adjustment of NOx emission is realized through a PID controller;
When the actual NOx measurement is greater than the NOx set point, the gas flow of the gas engine is reduced to increase the air-fuel ratio, specifically, the gas valve opening is further adjusted according to the target gas flow, so that the conversion of the target gas flow into the adjustment of the gas valve opening is performed according to the target gas flow, and finally, the actual NOx measurement is adjusted to be consistent with the NOx set point.
When the closed loop correction coefficient is smaller than the lower limit value of the preset range, namely the actual emission value of the nitrogen oxides of the gas engine is smaller than the lower limit of the emission setting range, and the actual emission value of the nitrogen oxides exceeds the emission setting range, the ignition advance angle of the gas engine is retarded, so that the explosion pressure in the cylinder is reduced to reduce the generation of NOx.
When the NOx actual measurement value is smaller than the NOx set value, the gas flow rate of the gas engine is increased to decrease the air-fuel ratio; when the closed loop correction coefficient is greater than a preset upper limit value and the actual NOx measurement value exceeds the upper limit value of the NOx emission preset proportion range and the NOx set value is still not reached, the gas flow of the gas engine is increased to increase the air-fuel ratio, specifically, the gas valve opening is further adjusted according to the target gas flow, so that the actual NOx measurement value is finally adjusted to be consistent with the NOx set value according to the conversion of the target gas flow into the adjustment of the gas valve opening.
When the closed loop correction coefficient is larger than the upper limit value of the preset range, namely the actual emission value of the nitrogen oxides of the gas engine is larger than the upper limit of the emission setting range, and the actual emission value of the nitrogen oxides exceeds the emission setting range, the ignition advance angle of the gas engine is increased, so that the explosion pressure in the cylinder is increased, and the dynamic property and the economical efficiency of the gas engine are improved.
According to the control method for the emission of the nitrogen oxides of the gas engine, the actual emission value of the NOx is basically consistent with the set value of the NOx through correcting the closed-loop correction coefficient of the NOx, namely adjusting the flow ratio of air of the gas flow of the gas engine; and the ignition advance angle of the gas engine is controlled, so that stable control of NOx emission is realized, and meanwhile, higher dynamic property and economy are maintained.
According to the control method for the nitrogen oxide emission of the gas engine, the nitrogen oxide sensor is adopted to conduct closed-loop control in real time, so that the responsiveness and the stability of the nitrogen oxide control are greatly improved.
The control method for the emission of the nitrogen oxides of the gas engine can also be based on feedforward control of the temperature and the humidity of the inlet air of the engine, and when the temperature and the humidity of the inlet air change, the control is performed according to the change size so as to compensate instability caused by the change, so that the whole emission control of the nitrogen oxides is more stable.
In some embodiments of the present invention, as shown in fig. 3, the ignition advance MAP is corrected based on the intake air temperature, and the control method of nitrogen oxide emission of the gas engine of the present invention corrects the feedforward control of the ignition advance based on the intake air temperature: acquiring a real-time air inlet temperature value of a gas engine; and comparing the real-time air inlet temperature value with a preset air inlet temperature value, controlling the ignition advance angle of the gas engine to correct, specifically controlling to increase the ignition advance angle of the gas engine according to the fact that the real-time air inlet temperature value is higher than the preset air inlet temperature value, and controlling to decrease the ignition advance angle of the gas engine according to the fact that the real-time air inlet temperature value is lower than the preset air inlet temperature value.
In some embodiments of the present invention, as shown in fig. 3, in the gas engine, an intake air temperature value may be preset to 25 ℃, and when the obtained real-time intake air temperature value is lower than the preset intake air temperature value by 25 ℃, the ignition advance angle is reduced according to the real-time intake air temperature so as to reduce the in-cylinder explosion pressure, thereby reducing the generation of NOx; when the real-time air inlet temperature value is higher than the preset air inlet temperature value by 25 ℃, the ignition advance angle is increased, so that combustion is advanced, and the dynamic property and the economical efficiency of the engine are improved.
The control method for the emission of the nitrogen oxides of the gas engine can be suitable for different models, different air inlet temperatures are set according to different models, and the real-time air inlet temperature is compared with a preset air inlet temperature value, so that the ignition advance angle of the gas engine is adjusted, the stable emission of the NOx is controlled, and the dynamic property and the economical efficiency of the engine can be improved.
According to the control method for the emission of the nitrogen oxides of the gas engine, different air inlet temperatures can be set in the same model of the gas engine according to the requirements of using conditions, and then the real-time air inlet temperature value is compared with the preset air inlet temperature value, so that the ignition advance angle of the gas engine is adjusted, the stable emission of NOx is controlled, and the dynamic property and the economical efficiency of the same model under different using conditions can be improved.
In some embodiments of the present invention, as shown in fig. 3, the gas engine has an intake temperature value of-35 ℃, -25 ℃, -15 ℃, -5 ℃,5 ℃,15 ℃,25 ℃,35 ℃,45 ℃,55 ℃,65 ℃ and an ignition advance angle at different load rates; presetting an air inlet temperature value of the gas engine according to different use environments of the gas engine; and then comparing the acquired real-time air inlet temperature value with a preset air inlet temperature value, correcting the ignition advance angle of the gas engine according to different load factors, and finally enabling the ignition advance angle to reach the ignition advance angle matched with the implemented air inlet temperature value.
In some embodiments of the present invention, as illustrated in fig. 4, the control method of nox emission of the gas engine of the present invention corrects the spark advance MAP based on the intake air humidity, and the feedforward control of the spark advance based on the intake air humidity: acquiring an intake humidity value of a gas engine; and controlling the ignition advance angle of the gas engine to correct according to the comparison of the air inlet humidity value and a preset air inlet humidity value, wherein the control method further comprises the following steps: the air inlet humidity value is higher than a preset air inlet humidity value, and the ignition advance angle of the gas engine is controlled to be increased; and the air inlet humidity value is lower than a preset air inlet humidity value, and the ignition advance angle of the gas engine is controlled to be reduced.
In some embodiments of the present invention, as shown in fig. 4, when the real-time intake air humidity value is lower than the preset intake air humidity value by 50%, the ignition advance angle is reduced according to the real-time intake air humidity to reduce the engine explosion pressure, thereby reducing the generation of NOx, and when the real-time intake air humidity is higher than the preset intake air humidity value by 50%, the ignition advance angle is increased to advance combustion and improve the power performance and economy of the engine.
The control method for the emission of the nitrogen oxides of the gas engine can be suitable for different models, different air inlet humidity is set according to different models, and the ignition advance angle of the gas engine is adjusted by comparing the real-time air inlet temperature with a preset air inlet humidity value, so that the stable emission of the NOx is controlled, and the dynamic property and the economical efficiency of the engine can be improved.
According to the control method for the emission of the nitrogen oxides of the gas engine, different air inlet humidity can be set in the same model of the gas engine according to the requirements of using conditions, and then the real-time air inlet temperature value is compared with the preset air inlet temperature value, so that the ignition advance angle of the gas engine is adjusted, the stable emission of NOx is controlled, and the dynamic property and the economical efficiency of the same model under different using conditions can be improved.
In some embodiments of the present invention, as shown in fig. 3, the intake air humidity value of the gas engine corresponds to different ignition advance angles under different load rates; any air inlet humidity value can be preset in the gas engine, and the ignition advance angle of the current real-time air inlet humidity value is corrected according to the corresponding target ignition advance angle in the air inlet humidity value of 0%,10%,20%,30%,40%,50%,60%,70%,80%,90% and 100%; and according to different load factors, the ignition advance angle of the gas engine is corrected, and finally the ignition advance angle is matched with the implemented intake air temperature value.
In some embodiments of the present invention, the method for controlling emission of nitrogen oxides from a gas engine according to the present invention reduces the gas flow of the gas engine when the actual emission value of nitrogen oxides is greater than the set value; and when the actual emission value of the nitrogen oxides is smaller than the set value, increasing the gas flow of the gas engine.
According to the nitrogen oxide closed-loop control method based on the real-time nitrogen oxide sensor signal, PID closed-loop control adjustment is carried out according to deviation between a nitrogen oxide measured value and a set value, gas flow is adjusted, air-fuel ratio adjustment is realized, and when a closed-loop correction coefficient exceeds a limit, ignition advance angle correction is carried out; ignition advance angle feedforward control based on intake air temperature and humidity.
The invention also provides a control system for nitrogen oxide emission of the gas engine, as shown in fig. 2, which mainly comprises an ECU, a supercharger, a temperature and humidity sensor 2, a gas valve 1 and an electronic throttle valve, wherein the temperature and humidity sensor is arranged in an air inlet pipeline, and a nitrogen oxide sensor 6 is arranged in an exhaust tail pipe.
The control system is also provided with: a mixer 3, a booster compressor 4, a booster turbine 5, a pre-throttle intake pressure temperature sensor 7, a throttle valve 8, and a post-throttle pressure temperature sensor 9.
The exhaust pipeline of the gas engine is provided with the nitrogen oxide sensor, and the nitrogen oxide sensor can collect real-time air inlet temperature and humidity according to the real-time nitrogen oxide emission value in the collected exhaust pipeline.
In some embodiments of the present invention, a nitrogen oxide sensor is disposed in an exhaust pipeline of a gas engine, and is configured to obtain actual emission information of nitrogen oxides of the gas engine, and send the actual emission information to a control unit, and perform PID closed-loop control adjustment based on the actual emission information of the nitrogen oxides, where the control unit adjusts the nitrogen oxide emission value according to the obtained time and through the PID closed-loop control, specifically, adjusts the flow ratio of gas to air according to the fact that the actual emission value of the nitrogen oxides exceeds a set range of emission, adjusts the flow ratio of gas to air to a limit value of a preset proportional range according to the flow ratio of gas to air, and controls the actual emission value of the nitrogen oxides to exceed the set range of emission, so as to correct the ignition advance angle of the gas engine, and realize that the emission value of the nitrogen oxides of the gas engine is controlled to be consistent with the preset value.
In some embodiments of the present invention, the control system for nitrogen oxide emission of a gas engine further includes a temperature and humidity sensor, which is disposed in an air intake pipeline of the gas engine, and is configured to obtain real-time air intake temperature information and real-time air intake humidity information of the gas engine, and send the real-time air intake temperature information and the real-time air intake humidity information to a control unit; the control unit receives the real-time air inlet temperature information and the real-time air inlet humidity information, acquires an air inlet real-time temperature value and a real-time air inlet humidity value according to the real-time air inlet temperature information and the real-time air inlet humidity information, controls and adjusts the flow ratio of the fuel gas and the air according to the fact that the actual emission value of the nitrogen oxide exceeds the emission setting range, adjusts the limit value of the preset proportion range according to the flow ratio of the fuel gas and the air, and controls the ignition advance angle of the fuel gas engine to correct.
In some embodiments of the invention, the control unit controls the ignition advance angle of the gas engine to be corrected according to the real-time intake air temperature value until the ignition advance angle is adjusted to a magnitude matching the real-time intake air temperature value.
In some embodiments of the invention, the control unit controls the ignition advance angle of the gas engine to be corrected according to the real-time intake air humidity value until the ignition advance angle is adjusted to a magnitude matching the real-time intake air humidity value.
According to the control system for the emission of the nitrogen oxides of the gas engine, the lower limit value of the preset proportion range can be adjusted according to the flow ratio of the gas to the air, and the actual emission value of the nitrogen oxides exceeds the emission setting range, so that the ignition advance angle of the gas engine is controlled to be reduced; and adjusting the flow ratio of the fuel gas to the air to the upper limit value of the preset proportion range, and controlling and increasing the ignition advance angle of the fuel gas engine when the actual emission value of the nitrogen oxides exceeds the emission setting range.
The control system for the emission of the nitrogen oxides of the gas engine can realize the optimal economy of the gas engine, and when the temperature and the humidity of the inlet air are changed, the actual emission value of the nitrogen oxides is basically consistent with the set value of the nitrogen oxides, so that the stable control of the emission of the nitrogen oxides is realized, and meanwhile, the higher dynamic property and economy are maintained.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A method for controlling nitrogen oxide emissions from a gas engine, the method comprising:
acquiring an actual emission value of nitrogen oxides of the gas engine;
According to the fact that the actual emission value of the nitrogen oxides exceeds the emission setting range, controlling and adjusting the flow ratio of the fuel gas to the air;
According to the flow ratio of the fuel gas and the air, adjusting the flow ratio to a limit value in a preset proportion range, and controlling the ignition advance angle of the fuel gas engine to correct when the actual emission value of the nitrogen oxides exceeds an emission setting range;
the method comprises the steps of adjusting the flow ratio of the fuel gas to the air to a limit value in a preset proportion range, controlling the ignition advance angle of the fuel gas engine to correct when the actual emission value of the nitrogen oxides exceeds an emission setting range, and further comprising:
The flow ratio of the fuel gas to the air is adjusted to a lower limit value of a preset proportion range, the actual emission value of the nitrogen oxides is larger than an upper limit value of an emission setting range, and the ignition advance angle of the fuel gas engine is controlled to be reduced;
And adjusting the flow ratio of the fuel gas to the air to the upper limit value of a preset proportion range, wherein the actual emission value of the nitrogen oxides is smaller than the lower limit of an emission setting range, and controlling to increase the ignition advance angle of the fuel gas engine.
2. The control method of nitrogen oxide emissions of a gas engine according to claim 1, further comprising a feed-forward control based on an intake air temperature of the gas engine:
Acquiring a real-time air inlet temperature value of the gas engine;
and controlling the ignition advance angle of the gas engine to correct according to the comparison between the real-time air inlet temperature value and the preset air inlet temperature value.
3. The method for controlling nitrogen oxide emissions of a gas engine according to claim 2, wherein said controlling the ignition advance angle of the gas engine to be corrected based on the real-time intake air temperature value compared with a preset intake air temperature value comprises:
controlling and increasing the ignition advance angle of the gas engine according to the fact that the real-time air inlet temperature value is higher than a preset air inlet temperature value;
and controlling to reduce the ignition advance angle of the gas engine according to the fact that the real-time air inlet temperature value is lower than a preset air inlet temperature value.
4. The method for controlling nitrogen oxide emissions of a gas engine according to claim 1, further comprising a feed-forward control based on an intake humidity of the gas engine:
acquiring an intake humidity value of the gas engine;
And controlling the ignition advance angle of the gas engine to correct according to the comparison of the air inlet humidity value and the preset air inlet humidity value.
5. The method for controlling nitrogen oxide emissions of a gas engine according to claim 4, wherein said controlling the spark advance of the gas engine for correction based on the intake air humidity value compared with a preset intake air humidity value comprises:
The air inlet humidity value is higher than a preset air inlet humidity value, and the ignition advance angle of the gas engine is controlled to be increased;
and the air inlet humidity value is lower than a preset air inlet humidity value, and the ignition advance angle of the gas engine is controlled to be reduced.
6. The method for controlling nitrogen oxide emissions of a gas engine according to claim 1, wherein controlling and adjusting the flow ratio of gas to air according to the actual nitrogen oxide emission value exceeding an emission amount setting range comprises:
Reducing the gas flow of the gas engine according to the fact that the actual emission value of the nitrogen oxides is larger than the upper limit of the emission setting range; and increasing the gas flow of the gas engine according to the fact that the actual emission value of the nitrogen oxides is smaller than the lower limit of the emission setting range.
7. A control system for nitrogen oxide emissions from a gas engine, the control system comprising:
The nitrogen oxide sensor is arranged in an exhaust pipeline of the gas engine and is used for acquiring actual emission information of nitrogen oxides of the gas engine and sending the actual emission information to the control unit;
the temperature and humidity sensor is arranged in an air inlet pipeline of the gas engine and used for acquiring real-time air inlet temperature information and real-time air inlet humidity information of the gas engine and sending the real-time air inlet temperature information and the real-time air inlet humidity information to the control unit;
The control unit is used for receiving the actual emission information, the real-time air inlet temperature information and the real-time air inlet humidity information, acquiring an actual emission value, an air inlet real-time temperature value and a real-time air inlet humidity value of nitrogen oxides according to the actual emission information, the real-time air inlet temperature information and the real-time air inlet humidity information, controlling and adjusting the flow ratio of fuel gas and air according to the fact that the actual emission value of the nitrogen oxides exceeds an emission setting range, adjusting the flow ratio of the fuel gas and the air to a limit value in a preset proportion range according to the flow ratio of the fuel gas and the air, controlling the actual emission value of the nitrogen oxides to exceed the emission setting range, and correcting the ignition advance angle of the fuel gas engine;
the method comprises the steps of adjusting the flow ratio of the fuel gas to the air to a limit value in a preset proportion range, controlling the ignition advance angle of the fuel gas engine to correct when the actual emission value of the nitrogen oxides exceeds an emission setting range, and further comprising:
The flow ratio of the fuel gas to the air is adjusted to a lower limit value of a preset proportion range, the actual emission value of the nitrogen oxides is larger than an upper limit value of an emission setting range, and the ignition advance angle of the fuel gas engine is controlled to be reduced;
And adjusting the flow ratio of the fuel gas to the air to the upper limit value of a preset proportion range, wherein the actual emission value of the nitrogen oxides is smaller than the lower limit value of an emission setting range, and controlling to increase the ignition advance angle of the fuel gas engine.
8. The control system for nitrogen oxide emissions of a gas engine as claimed in claim 7,
And the control unit controls the ignition advance angle of the gas engine to correct according to the comparison between the real-time air inlet temperature value and the preset air inlet temperature value until the ignition advance angle is adjusted to be matched with the real-time air inlet temperature value.
9. The control system for nitrogen oxide emissions of a gas engine as claimed in claim 7,
And the control unit controls the ignition advance angle of the gas engine to correct according to the comparison between the real-time air inlet humidity value and the preset air inlet humidity value until the ignition advance angle is adjusted to be matched with the real-time air inlet humidity value.
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