CN117028049B - Cold start control method and related device for methanol engine - Google Patents
Cold start control method and related device for methanol engine Download PDFInfo
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- CN117028049B CN117028049B CN202311282601.1A CN202311282601A CN117028049B CN 117028049 B CN117028049 B CN 117028049B CN 202311282601 A CN202311282601 A CN 202311282601A CN 117028049 B CN117028049 B CN 117028049B
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 666
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000000446 fuel Substances 0.000 claims abstract description 190
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 188
- 239000003345 natural gas Substances 0.000 claims abstract description 94
- 238000002485 combustion reaction Methods 0.000 claims abstract description 64
- 239000007789 gas Substances 0.000 claims abstract description 13
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 238000004590 computer program Methods 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000003502 gasoline Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
- F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0602—Control of components of the fuel supply system
- F02D19/0607—Control of components of the fuel supply system to adjust the fuel mass or volume flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
- F02D19/0642—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
- F02D19/0647—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention provides a cold start control method of a methanol engine and a related device, wherein the methanol engine is started by adopting natural gas fuel under the condition that the ambient temperature is smaller than a preset value, the excess air coefficient of exhaust gas of the methanol engine is obtained, and the natural gas fuel supply amount and the methanol fuel supply amount are controlled according to the excess air coefficient, so that the combustion mode of the methanol engine is equivalent combustion. According to the invention, the natural gas is adopted to assist the cold start of the methanol engine, the combustion condition of the engine in-cylinder is monitored through the excess air coefficient, the natural gas fuel supply amount and the methanol fuel supply amount are reasonably controlled, the automatic switching of fuel in the starting stage of the methanol engine is realized, and the performance of the methanol engine in the starting stage is improved.
Description
Technical Field
The invention relates to the technical field of methanol engines, in particular to a cold start control method and a related device of a methanol engine.
Background
The methanol fuel is used as a future alternative fuel of the engine, has the characteristics of wide sources, simple preparation, excellent combustion performance and the like, and simultaneously has the advantages of reducing the emission of carbon smoke and nitrogen oxides, and the like.
However, methanol fuel has high vaporization latent heat and low saturated vapor pressure, so that the formation of combustible mixed gas is difficult, and the flame-retarding period of the mixed gas before ignition is prolonged. The vaporization latent heat of the methanol is 3.7 times that of the gasoline, and the methanol absorbs more heat when evaporating, so that the temperature in an air inlet channel and an air cylinder of the methanol engine is rapidly reduced. Under the condition of lower ambient temperature, the evaporation capacity of the methanol fuel is insufficient, and the concentration of the combustible mixture does not reach the ignition lean limit, so that the cold start of the methanol engine is difficult.
Disclosure of Invention
In view of the above, the invention provides a cold start control method and a related device for a methanol engine, which are used for monitoring the combustion condition of the engine cylinder through an excess air coefficient, reasonably controlling the natural gas fuel supply amount and the methanol fuel supply amount, realizing the automatic fuel switching in the starting stage of the methanol engine, and improving the performance of the methanol engine in the starting stage.
In order to achieve the above purpose, the specific technical scheme provided by the invention is as follows:
in a first aspect, an embodiment of the present invention provides a method for controlling cold start of a methanol engine, including:
under the condition that the ambient temperature is less than a preset value, starting the methanol engine by adopting natural gas fuel;
acquiring an excess air ratio of the exhaust of the methanol engine;
and controlling the natural gas fuel supply amount and the methanol fuel supply amount according to the excess air coefficient so as to enable the combustion mode of the methanol engine to be equivalent combustion.
In some embodiments, the controlling the natural gas fuel supply and the methanol fuel supply according to the excess air ratio to enable the methanol engine to burn in an equivalent combustion manner includes:
and when the excess air coefficient is in a preset range, reducing the natural gas fuel supply amount, and starting the methanol fuel supply to enable the combustion mode of the methanol engine to be equivalent combustion.
In some embodiments, after said reducing the natural gas fueling and initiating the methanol fueling, further comprising:
acquiring an average value of excess air coefficients of the methanol engine in a preset number of working cycles;
and if the average value of the excess air coefficient is in the preset range, reducing the natural gas fuel supply amount stepwise, improving the methanol fuel supply amount, and returning to execute the step of obtaining the average value of the excess air coefficient of the methanol engine in the preset number of working cycles until the pure methanol fuel supply is realized.
In some embodiments, the step reducing natural gas fuel supply and increasing methanol fuel supply comprises:
stepwise reducing the natural gas fuel supply according to a preset proportion;
and determining the increasing amount of the methanol fuel according to the decreasing amount of the natural gas fuel supply and the ratio of the methanol heat value to the natural gas heat value, so that the work generated by the methanol engine is unchanged.
In some embodiments, further comprising:
and under the condition that the ambient temperature is not less than a preset value, starting the methanol engine by adopting methanol fuel.
In a second aspect, an embodiment of the present invention provides a cold start control device for a methanol engine, including:
the natural gas starting unit is used for starting the methanol engine by adopting natural gas fuel under the condition that the ambient temperature is smaller than a preset value;
an excess air ratio acquisition unit for acquiring an excess air ratio of the methanol engine exhaust gas;
and the fuel supply amount control unit is used for controlling the natural gas fuel supply amount and the methanol fuel supply amount according to the excess air coefficient so as to enable the combustion mode of the methanol engine to be equivalent combustion.
In some embodiments, the fuel supply amount control unit is specifically configured to reduce the natural gas fuel supply amount and start the methanol fuel supply when the excess air ratio is within a preset range, so that the combustion mode of the methanol engine is equivalent combustion.
In some embodiments, the fuel supply amount control unit is further configured to obtain an average value of excess air ratio of the methanol engine over a preset number of working cycles after the reducing the natural gas fuel supply amount and starting the methanol fuel supply; and if the average value of the excess air coefficient is in the preset range, reducing the natural gas fuel supply amount stepwise, improving the methanol fuel supply amount, and returning to execute the step of obtaining the average value of the excess air coefficient of the methanol engine in the preset number of working cycles until the pure methanol fuel supply is realized.
In some embodiments, if the average value of the excess air ratio is within a preset range, the fuel supply amount control unit is specifically configured to stepwise reduce the natural gas fuel supply amount according to a preset ratio; and determining the increasing amount of the methanol fuel according to the decreasing amount of the natural gas fuel supply and the ratio of the methanol heat value to the natural gas heat value, so that the work generated by the methanol engine is unchanged.
In some embodiments, further comprising:
and the methanol starting unit is used for starting the methanol engine by adopting methanol fuel under the condition that the ambient temperature is not less than a preset value.
In a third aspect, an embodiment of the present invention provides an electronic control unit, where the electronic control unit includes a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute a cold start control method for a methanol engine as described in any implementation manner of the first aspect according to instructions in the program code.
In a fourth aspect, an embodiment of the present invention provides a computer readable storage medium, where a computer program is stored, where the computer program, when executed by a processor, implements a cold start control method for a methanol engine as described in any one of the implementations of the first aspect.
Compared with the prior art, the invention has the following beneficial effects:
according to the cold start control method and the related device for the methanol engine, provided by the invention, the methanol engine is started by adopting natural gas fuel under the condition that the ambient temperature is smaller than a preset value, so that the starting performance of the methanol engine in a low-temperature environment is improved. And acquiring an excessive air coefficient of exhaust gas of the methanol engine, monitoring the combustion condition of the engine cylinder through the excessive air coefficient, reasonably controlling the natural gas fuel supply amount and the methanol fuel supply amount, realizing automatic switching of fuel in the starting stage of the methanol engine, and improving the performance of the methanol engine in the starting stage.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a cold start control method for a methanol engine according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a part of a cold start control method for a methanol engine according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a part of a cold start control method for a methanol engine according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a part of a cold start control method for a methanol engine according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a cold start control device for a methanol engine according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic control unit according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The inventor has found through research that: when the methanol engine is started in a low-temperature environment, only a small amount of methanol is evaporated, the concentration of the combustible mixture does not reach the ignition lean limit, and the mixture can not be ignited when the spark plug is ignited. If no auxiliary measures are taken, the methanol engine cannot be started smoothly no matter how much methanol fuel is injected in the first cycle of the methanol engine. At present, the technical schemes of gasoline auxiliary starting, diesel compression ignition, fuel heater (water boiler) heating auxiliary starting and the like are generally adopted. However, the combustion of gasoline and diesel oil has certain pollution, and the heating auxiliary starting efficiency of the fuel heater is lower. The natural gas is used as a clean energy source, has the advantages of environmental protection, economy and high efficiency, and the natural gas is used for assisting the cold start of the methanol, so that the methanol engine is fast, stable and reliable in start, and the cold start control method and the related device for the methanol engine are provided for improving the low-temperature start performance of the methanol engine.
The invention provides a cold start control method of a methanol engine, which is applied to an electronic control unit (Electronic Control Unit, ECU) in a vehicle, wherein the vehicle adopts the methanol engine. The natural gas fuel and the methanol fuel are simultaneously arranged on the methanol engine, and the feeding and injection device of the methanol fuel is arranged on the methanol engine.
Referring to fig. 1, the cold start control method of a methanol engine disclosed in this embodiment specifically includes the following steps:
s101: under the condition that the ambient temperature is less than a preset value, starting the methanol engine by adopting natural gas fuel;
the ambient temperature may be detected by an atmospheric environmental sensor.
Further, the sensor for detecting the ambient temperature may detect an ambient temperature greater than the actual ambient temperature under irradiation of sunlight. In order to make the ambient temperature more accurate, the minimum temperature value among the ambient temperature detected by the sensor, the intake air temperature of the methanol engine, the engine oil temperature, and the engine coolant temperature may also be used as the above-mentioned ambient temperature.
The preset value can be 16 ℃, the temperature is related to the physicochemical property of the methanol fuel, and the related research shows that: when the ambient temperature is less than 16 ℃, the methanol fuel is not evaporated, so that combustible mixed gas with sufficient concentration cannot be formed, and ignition combustion cannot be realized.
And starting the methanol engine by adopting natural gas fuel, namely controlling the natural gas fuel injection device to inject the natural gas fuel to assist the methanol engine to start, wherein the methanol fuel injection device does not inject. The natural gas fuel may employ an intake pipe single point injection scheme.
Under the condition that the ambient temperature is not less than a preset value, starting the methanol engine by adopting the methanol fuel, namely controlling the methanol fuel injection device to inject the methanol fuel to start the methanol engine, wherein the natural gas fuel injection device does not inject, and the fuel switching is not involved in the follow-up. The methanol fuel may employ an intake manifold multi-point injection scheme.
S102: obtaining an excess air ratio of exhaust gas of a methanol engine;
specifically, the excess air ratio lambda of the exhaust gas of the methanol engine is obtained by using a front oxygen sensor mounted on the engine exhaust pipe.
The ratio of the air quantity actually supplied to the fuel combustion to the theoretical air quantity is represented by an excess air coefficient lambda, and is a parameter reflecting the mixing ratio of the fuel and the air, namely, the oxygen content in the exhaust gas generated after the combustion of the air-fuel mixture of the cylinder is detected, and the excessive oxygen content indicates that the air-fuel mixture is diluted; too low an oxygen content indicates that the mixture is too rich. The front oxygen sensor transmits different electric signals to the electric control unit according to different oxygen contents.
S103: according to the excess air ratio, the natural gas fuel supply amount and the methanol fuel supply amount are controlled so that the combustion mode of the methanol engine is equivalent combustion.
Since the excess air coefficient lambda represents the combustion condition of the engine cylinder, the natural gas fuel supply amount and the methanol fuel supply amount are controlled according to the excess air coefficient lambda, and the excess air coefficient lambda is in a preset range, for example, the excess air coefficient lambda is about 1, and the combustion mode of the methanol engine is equivalent combustion, the natural gas combustion supply amount can be reduced, and the methanol fuel supply is started until the pure methanol fuel supply is realized.
Specifically, the natural gas fuel supply amount and the methanol fuel supply amount are equivalent combustion to satisfy the combustion mode of the methanol engine. Equivalent combustion means that the stoichiometric ratio of fuel to oxygen is 1, the fuel and the oxygen are just completely combusted, and the combustion efficiency is higher, the combustion chamber temperature is higher, and the generation rate of nitrogen oxides without excessive air is greatly reduced.
Therefore, the natural gas fuel supply amount and the methanol fuel supply amount are reasonably controlled according to the excess air coefficient, so that the combustion mode of the methanol engine is equivalent combustion, the combustion efficiency of fuel in the methanol engine is improved, and the performance of the methanol engine is improved.
Therefore, in the cold start control method for the methanol engine disclosed in the embodiment, the methanol engine is started by using the natural gas fuel under the condition that the ambient temperature is smaller than the preset value, so that the starting performance of the methanol engine in a low-temperature environment is improved. And acquiring an excessive air coefficient of exhaust gas of the methanol engine, monitoring the combustion condition of the engine cylinder through the excessive air coefficient, reasonably controlling the natural gas fuel supply amount and the methanol fuel supply amount, realizing automatic switching of fuel in the starting stage of the methanol engine, and improving the performance of the methanol engine in the starting stage.
In some embodiments, S103 in the foregoing embodiments, according to the air excess factor, the natural gas fuel supply amount and the methanol fuel supply amount are controlled, so that the combustion mode of the methanol engine is equivalent combustion, and an alternative implementation manner is shown in fig. 2, and specifically includes the following steps:
s201: judging whether the excess air coefficient is within a preset range;
s202 is performed when the excess air ratio is within the preset range: reducing the natural gas fuel supply amount, starting the methanol fuel supply, and enabling the combustion mode of the methanol engine to be equivalent combustion;
the excess air ratio is not within the preset range, S203 is executed: and controlling the natural gas fuel supply amount according to the equivalent combustion mode, and not starting the methanol fuel supply.
The excess air ratio is obtained in the first working cycle of the methanol engine, wherein the four processes of air intake, compression, work and exhaust are completed into one working cycle, and the faster the engine speed is, the shorter the working cycle time is.
If the excess air ratio is within the preset range, if the excess air ratio lambda is about 1, the combustion efficiency in the cylinder of the engine is higher, the natural gas fuel supply amount can be gradually reduced, and the methanol fuel supply can be started. If the excess air ratio is not within the preset range, determining that the combustion in the cylinder of the engine is poor, not starting the methanol fuel supply at the moment, and controlling the natural gas fuel supply amount according to the equivalent combustion mode.
After reducing the natural gas fuel supply amount and starting the methanol fuel supply, in order to reasonably control the natural gas fuel supply amount and the methanol fuel supply amount, the combustion mode of the methanol engine is equivalent combustion, the combustion efficiency of the engine in a cylinder is improved, an excess air coefficient is required to be obtained, and the natural gas fuel supply amount and the methanol fuel supply amount are controlled according to the excess air coefficient. Two alternative implementations are provided below:
as shown in fig. 3, the first embodiment includes the following steps:
s301: judging whether the pure methanol fuel is supplied for each working cycle;
if not, S302: acquiring an excess air coefficient;
s303: if the excess air coefficient is not in the preset range, not adjusting the methanol fuel supply amount, and adjusting the natural gas fuel supply amount according to the equivalent combustion mode;
s304: if the excess air ratio is within the preset range, the natural gas fuel supply amount is stepwise reduced, the methanol fuel supply amount is increased, and S301 is performed back until pure methanol fuel supply is achieved.
Mode two, as shown in fig. 4, includes the following steps:
s401: judging whether the pure methanol fuel is supplied;
if pure methanol fuel is not supplied, S402: acquiring an excessive air coefficient average value of the methanol engine in a preset number of working cycles;
s403: if the average value of the excess air coefficient is not in the preset range, not adjusting the methanol fuel supply amount, and adjusting the natural gas fuel supply amount according to the equivalent combustion mode;
s404: if the average value of the excess air ratio is within the preset range, the natural gas fuel supply amount is reduced stepwise, the methanol fuel supply amount is increased, and the execution returns to S401 until the pure methanol fuel supply is realized.
The preset number can be set according to the actual application scenario, for example, 3, and the invention is not limited in particular.
Wherein, the above-mentioned step-type reduces the fuel supply of natural gas, improves the fuel supply of methanol, an optional implementation mode is as follows:
stepwise reducing the natural gas fuel supply according to a preset proportion;
and determining the increasing amount of the methanol fuel according to the decreasing amount of the natural gas fuel supply and the ratio of the methanol heat value to the natural gas heat value, so that the work generated by the methanol engine is unchanged.
If the natural gas fuel supply amount is reduced stepwise according to the proportion of 10%, the reduction amount of the natural gas fuel supply amount is 10% of the natural gas fuel in the previous working cycle, the ratio of the methanol heat value to the natural gas heat value is 1:2, the reduction amount of the natural gas fuel supply amount is 10% of the natural gas fuel in the previous working cycle, and the improvement amount of the methanol fuel is 20% of the natural gas fuel in the previous working cycle, so that the work generated by the methanol engine can be ensured to be unchanged.
Based on the foregoing embodiment, the embodiment correspondingly discloses a cold start control device for a methanol engine, please refer to fig. 5, which includes:
a natural gas starting unit 501, configured to start the methanol engine with natural gas fuel when the ambient temperature is less than a preset value;
an excess air ratio acquisition unit 502 for acquiring an excess air ratio of the methanol engine exhaust gas;
and a fuel supply amount control unit 503 for controlling the natural gas fuel supply amount and the methanol fuel supply amount according to the excess air ratio so that the combustion mode of the methanol engine is equivalent combustion.
In some embodiments, the fuel supply amount control unit 503 is specifically configured to reduce the natural gas fuel supply amount and start the methanol fuel supply when the excess air ratio is within a preset range, so that the combustion mode of the methanol engine is equivalent combustion.
In some embodiments, the fuel supply amount control unit 503 is further configured to obtain an average value of excess air ratio of the methanol engine in a preset number of working cycles after the reducing the natural gas fuel supply amount and starting the methanol fuel supply; and if the average value of the excess air coefficient is in the preset range, reducing the natural gas fuel supply amount stepwise, improving the methanol fuel supply amount, and returning to execute the step of obtaining the average value of the excess air coefficient of the methanol engine in the preset number of working cycles until the pure methanol fuel supply is realized.
In some embodiments, if the average value of the excess air ratio is within a preset range, the fuel supply amount control unit 503 is specifically configured to stepwise reduce the natural gas fuel supply amount according to a preset ratio; and determining the increasing amount of the methanol fuel according to the decreasing amount of the natural gas fuel supply and the ratio of the methanol heat value to the natural gas heat value, so that the work generated by the methanol engine is unchanged.
In some embodiments, further comprising:
and the methanol starting unit is used for starting the methanol engine by adopting methanol fuel under the condition that the ambient temperature is not less than a preset value.
According to the cold start control device for the methanol engine, disclosed by the embodiment, the methanol engine is started by adopting natural gas fuel under the condition that the ambient temperature is smaller than a preset value, so that the starting performance of the methanol engine in a low-temperature environment is improved. And acquiring an excessive air coefficient of exhaust gas of the methanol engine, monitoring the combustion condition of the engine cylinder through the excessive air coefficient, reasonably controlling the natural gas fuel supply amount and the methanol fuel supply amount, realizing automatic switching of fuel in the starting stage of the methanol engine, and improving the performance of the methanol engine in the starting stage.
The embodiment of the present invention further provides an electronic control unit, for example, referring to fig. 6, where the electronic control unit includes a processor 601 and a memory 602;
the memory 602 is used for storing program codes and transmitting the program codes to the processor 601;
the processor 601 is configured to execute a method for controlling cold start of a methanol engine according to an instruction in the program code, as described in any one of the above embodiments.
The embodiment of the invention also provides a computer readable storage medium, and a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the method for controlling the cold start of the methanol engine is realized.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments may be combined in any manner, and features described in the embodiments in the present specification may be replaced or combined with each other in the above description of the disclosed embodiments, so as to enable one skilled in the art to make or use the present application.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A method for controlling cold start of a methanol engine, comprising:
under the condition that the ambient temperature is less than a preset value, starting the methanol engine by adopting natural gas fuel;
acquiring an excess air ratio of the exhaust of the methanol engine;
according to the excess air coefficient, controlling the natural gas fuel supply amount and the methanol fuel supply amount to enable the combustion mode of the methanol engine to be equivalent combustion;
and controlling the natural gas fuel supply amount and the methanol fuel supply amount according to the excess air coefficient to enable the combustion mode of the methanol engine to be equivalent combustion, wherein the method comprises the following steps of:
judging whether the excess air coefficient is within a preset range;
when the excess air coefficient is in a preset range, reducing the natural gas fuel supply amount, and starting the methanol fuel supply to enable the combustion mode of the methanol engine to be equivalent combustion;
and when the excess air coefficient is not in the preset range, controlling the natural gas fuel supply amount according to the equivalent combustion mode, and not starting the methanol fuel supply.
2. The methanol engine cold start control method as set forth in claim 1, further comprising, after the reducing the natural gas fuel supply amount and starting the methanol fuel supply:
acquiring an average value of excess air coefficients of the methanol engine in a preset number of working cycles;
and if the average value of the excess air coefficient is in the preset range, reducing the natural gas fuel supply amount stepwise, improving the methanol fuel supply amount, and returning to execute the step of obtaining the average value of the excess air coefficient of the methanol engine in the preset number of working cycles until the pure methanol fuel supply is realized.
3. The method for controlling cold start of a methanol engine according to claim 2, wherein the stepwise decreasing of the natural gas fuel supply amount and increasing of the methanol fuel supply amount comprises:
stepwise reducing the natural gas fuel supply according to a preset proportion;
and determining the increasing amount of the methanol fuel according to the decreasing amount of the natural gas fuel supply and the ratio of the methanol heat value to the natural gas heat value, so that the work generated by the methanol engine is unchanged.
4. The methanol engine cold start control method as set forth in claim 1, further comprising:
and under the condition that the ambient temperature is not less than a preset value, starting the methanol engine by adopting methanol fuel.
5. A cold start control device for a methanol engine, comprising:
the natural gas starting unit is used for starting the methanol engine by adopting natural gas fuel under the condition that the ambient temperature is smaller than a preset value;
an excess air ratio acquisition unit for acquiring an excess air ratio of the methanol engine exhaust gas;
a fuel supply amount control unit for controlling the natural gas fuel supply amount and the methanol fuel supply amount according to the excess air ratio so that the combustion mode of the methanol engine is equivalent combustion;
the fuel supply amount control unit is specifically configured to determine whether the excess air ratio is within a preset range; when the excess air coefficient is in a preset range, reducing the natural gas fuel supply amount, and starting the methanol fuel supply to enable the combustion mode of the methanol engine to be equivalent combustion; and when the excess air coefficient is not in the preset range, controlling the natural gas fuel supply amount according to the equivalent combustion mode, and not starting the methanol fuel supply.
6. The methanol engine cold start control apparatus as set forth in claim 5, wherein the fuel supply amount control unit is further configured to obtain an average value of excess air ratio of the methanol engine over a preset number of operating cycles after the reducing of the natural gas fuel supply amount and starting of the methanol fuel supply; and if the average value of the excess air coefficient is in the preset range, reducing the natural gas fuel supply amount stepwise, improving the methanol fuel supply amount, and returning to execute the step of obtaining the average value of the excess air coefficient of the methanol engine in the preset number of working cycles until the pure methanol fuel supply is realized.
7. An electronic control unit, characterized in that the electronic control unit comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute a cold start control method for a methanol engine according to any one of claims 1 to 4 according to instructions in the program code.
8. A computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, which when executed by a processor, implements a methanol engine cold start control method as set forth in any one of claims 1-4.
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| CN202311282601.1A CN117028049B (en) | 2023-10-07 | 2023-10-07 | Cold start control method and related device for methanol engine |
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| CN202311282601.1A CN117028049B (en) | 2023-10-07 | 2023-10-07 | Cold start control method and related device for methanol engine |
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