CN116498449A - Cold start method and device of engine, vehicle and readable storage medium - Google Patents
Cold start method and device of engine, vehicle and readable storage medium Download PDFInfo
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- CN116498449A CN116498449A CN202310582749.0A CN202310582749A CN116498449A CN 116498449 A CN116498449 A CN 116498449A CN 202310582749 A CN202310582749 A CN 202310582749A CN 116498449 A CN116498449 A CN 116498449A
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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
- 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
- F02D19/08—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 simultaneously using pluralities of fuels
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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
- 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
- F02D19/0649—Liquid fuels having different boiling temperatures, volatilities, densities, viscosities, cetane or octane numbers
- F02D19/0652—Biofuels, e.g. plant oils
- F02D19/0655—Biofuels, e.g. plant oils at least one fuel being an alcohol, e.g. ethanol
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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
- 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
- F02D19/08—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 simultaneously using pluralities of fuels
- F02D19/082—Premixed fuels, i.e. emulsions or blends
- F02D19/084—Blends of gasoline and alcohols, e.g. E85
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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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- 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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Abstract
The invention discloses a cold start method and device of an engine, a vehicle and a readable storage medium, wherein the method comprises the following steps: when the condition of cold start of the engine is detected to be met, a first injection pulse width and a second injection pulse width are obtained; injecting methanol into an air inlet channel of the engine according to the first injection pulse width, and injecting gasoline into the air inlet channel according to the second injection pulse width so as to form mixed gas in the air inlet channel; and performing cold start of the engine by adopting the mixed gas. Compared with the method for executing the cold start by using gasoline as fuel or using methanol as fuel, the method for executing the cold start by using methanol as fuel can improve the cold start effect of the methanol engine, realize the cold start at lower ambient temperature, and simultaneously slow down the consumption of gasoline during the cold start of the methanol engine.
Description
The application is a divisional application with the application number of 202111200633.3, and the application date of the main application is 2021, 10 and 14; the invention of the parent case is named as follows: a method, apparatus, vehicle and readable storage medium for cold start of an engine.
Technical Field
The present invention relates to the field of vehicle engines, and in particular, to a method and apparatus for cold starting an engine, a vehicle, and a readable storage medium.
Background
At present, when a methanol engine is started in a cold mode, gasoline can be used as fuel, so that the problem that the engine is started slowly when methanol is used as fuel is avoided, and the problem that the cold start cannot be realized due to the fact that the methanol has polarity and large latent heat under the condition that the temperature environment temperature is lower than 16 ℃ is avoided.
In addition, as the specific requirements exist for the whole vehicle endurance mileage, and the calorific value of the methanol used as the main fuel is low, the space occupied by the gasoline tank in the whole vehicle is limited, the gasoline tank with the volume exceeding 15L cannot be used, and the volume of the gasoline which can be filled is low. In order to avoid improving the performance of the cold start of the engine, in the cold start process of the engine, gasoline is directly used for cold start first, and then methanol is switched to be used as fuel for the engine.
Therefore, each time of cold start takes gasoline as fuel, and under the conditions that the volume of a gasoline tank is limited and the cold start is started frequently, the gasoline consumption speed is high, a user is required to frequently charge gasoline, and the use experience of a vehicle is reduced. Meanwhile, in the case of using only gasoline as fuel, if the ambient temperature is low, cold start still cannot be performed.
Therefore, the invention at least solves the following technical problems: how to slow down the consumption of gasoline at the time of cold start of a methanol engine, and at the same time to realize cold start at a lower ambient temperature than when cold start is performed using gasoline alone as fuel.
Disclosure of Invention
The invention mainly aims to provide a cold start method and device of an engine, a vehicle and a readable storage medium, and aims to solve the technical problem of how to slow down the consumption of gasoline in the cold start of a methanol engine, and simultaneously realize the cold start at a lower environment temperature compared with the method for using gasoline as fuel to execute the cold start.
To achieve the above object, the present invention provides a cold start method of an engine, the method comprising:
when the condition of cold start of the engine is detected to be met, a first injection pulse width and a second injection pulse width are obtained;
injecting methanol into an air inlet channel of the engine according to the first injection pulse width, and injecting gasoline into the air inlet channel according to the second injection pulse width so as to form mixed gas in the air inlet channel;
and performing cold start of the engine by adopting the mixed gas.
Optionally, the step of acquiring the first injection pulse width and the second injection pulse width when the condition of cold start of the engine is detected to be met includes:
when the condition of the cold start of the engine is detected to be met, acquiring a target temperature, wherein the target temperature is the ambient temperature or the water temperature of the engine;
and determining the first injection pulse width and the second injection pulse width according to the target temperature.
Optionally, the step of determining the first injection pulse width and the second injection pulse width according to the target temperature includes:
determining a first injection amount of the methanol and a second injection amount of the gasoline according to the target temperature and the rotation speed of the engine;
and determining the first injection pulse width according to the first injection quantity, and determining the second injection pulse width according to the second injection quantity.
Optionally, the step of injecting the methanol into the intake passage of the engine according to the first injection pulse width and injecting the gasoline into the intake passage according to the second injection pulse width to form the mixture in the intake passage includes:
and after the moment when the intake valve of the engine is closed and before the moment when the intake valve of the engine is opened again, injecting methanol into the air inlet channel of the engine according to the first injection pulse width, and injecting gasoline into the air inlet channel according to the second injection pulse width so as to form a mixed gas in the air inlet channel.
Optionally, after the intake valve of the engine is closed and before the intake valve of the engine is opened again, injecting methanol into the intake port of the engine according to the first injection pulse width, and injecting gasoline into the intake port according to the second injection pulse width, so as to further include, before the step of forming the mixture in the intake port:
a timing at which an intake valve of the engine is closed, and a timing at which an intake valve of the engine is opened again are determined according to a crank angle of the engine.
Optionally, after the step of using the mixture to perform the starting of the engine, the method further includes:
and when the rotating speed of the engine is larger than the preset rotating speed, executing idle speed control, and stopping injecting the gasoline.
Optionally, the volume ratio of the methanol in the mixed gas is 10% to 20%.
In addition, in order to achieve the above object, the present invention also provides a cold start device of an engine, the device including an acquisition module, an injection module, and a start module, wherein:
the acquisition module is used for acquiring a first injection pulse width and a second injection pulse width when the condition of cold start of the engine is detected to be met
The injection module is used for injecting methanol into an air inlet channel of the engine according to the first injection pulse width and injecting gasoline into the air inlet channel according to the second injection pulse width so as to form a mixed gas in the air inlet channel
The starting module is used for executing cold starting of the engine by adopting the mixed gas.
In addition, in order to achieve the above object, the present invention also provides a vehicle including a memory, a processor, and a cold start program of an engine stored on the memory and operable on the processor, the cold start program of the engine, when executed by the processor, implementing the steps of the cold start method of the engine of any one of the above.
In addition, in order to achieve the above object, the present invention provides a computer-readable storage medium having stored thereon a cold start program of an engine, which when executed by a processor, implements the steps of the cold start method of an engine as set forth in any one of the above.
According to the cold start method, the cold start device, the vehicle and the readable storage medium of the engine, when the cold start condition of the engine is met, the first injection pulse width and the second injection pulse width are obtained, methanol is injected into the air inlet channel of the engine according to the first injection pulse width, gasoline is injected into the air inlet channel according to the second injection pulse width, so that mixed gas is formed in the air inlet channel, and the engine is started by adopting the mixed gas. Wherein, respectively injecting methanol and gasoline, forming a mixed gas in the air inlet channel, and starting the engine by adopting the mixed gas. Because the acting forces of the methanol and the gasoline are different, the acting forces are weakened or destroyed after the mixed gas is formed, and partial components of the methanol and the gasoline are azeotroped, so that the saturated vapor pressure of the mixed gas is increased, and the cold start can be realized by adopting the mixed gas. Meanwhile, the gasoline contains light hydrocarbon, and the distillation temperature of the fuel after the gasoline is mixed with the methanol is lower than that of the fuel which is only gasoline or methanol, so that cold start at lower environmental temperature can be realized. On the basis of realizing cold start at a lower ambient temperature, the mixed gas comprises gasoline and methanol, so that the problem of high gasoline consumption speed under the condition of only adopting gasoline is solved. The consumption of gasoline during the cold start of the methanol engine can be slowed down.
Drawings
FIG. 1 is a schematic diagram of a device architecture of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a flow chart of a first embodiment of a cold start method of an engine according to the present invention;
FIG. 3 is a flow chart of a second embodiment of a cold start method of the engine of the present invention;
FIG. 4 is a flow chart illustrating a method of acquiring a first injection pulse width and a second injection pulse width according to a second embodiment;
FIG. 5 is a flow chart of a third embodiment of a cold start method of an engine according to the present invention;
fig. 6 is a control schematic diagram at the time of engine cold start according to the third embodiment;
fig. 7 is a schematic system configuration diagram of a cold start device of an engine according to the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic diagram of an apparatus structure of a hardware running environment according to an embodiment of the present invention.
As shown in fig. 1, the apparatus may include: a processor 1001, such as a CPU, memory 1002, a communications bus 1003. Wherein the communication bus 1002 is used to enable connected communication between these components. The memory 1002 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1002 may alternatively be a storage device separate from the processor 1001 described above.
It will be appreciated by those skilled in the art that the device structure shown in fig. 1 is not limiting of the device and may include more or fewer components than shown, or may be combined with certain components, or a different arrangement of components.
As shown in fig. 1, a cold start program of an engine may be included in a memory 1002 as a kind of computer storage medium.
In the apparatus shown in fig. 1, the processor 1001 may be configured to call a cold start program of the engine stored in the memory 1002 and perform the following operations:
when the condition of cold start of the engine is detected to be met, a first injection pulse width and a second injection pulse width are obtained;
injecting methanol into an air inlet channel of the engine according to the first injection pulse width, and injecting gasoline into the air inlet channel according to the second injection pulse width so as to form mixed gas in the air inlet channel;
and performing cold start of the engine by adopting the mixed gas.
Further, the processor 1001 may call a cold start program of the engine stored in the memory 1002, and further perform the following operations:
when the condition of the cold start of the engine is detected to be met, acquiring a target temperature, wherein the target temperature is the ambient temperature or the water temperature of the engine;
and determining the first injection pulse width and the second injection pulse width according to the target temperature.
Further, the processor 1001 may call a cold start program of the engine stored in the memory 1002, and further perform the following operations:
determining a first injection amount of the methanol and a second injection amount of the gasoline according to the target temperature and the rotation speed of the engine;
and determining the first injection pulse width according to the first injection quantity, and determining the second injection pulse width according to the second injection quantity.
Further, the processor 1001 may call a cold start program of the engine stored in the memory 1002, and further perform the following operations:
and after the moment when the intake valve of the engine is closed and before the moment when the intake valve of the engine is opened again, injecting methanol into the air inlet channel of the engine according to the first injection pulse width, and injecting gasoline into the air inlet channel according to the second injection pulse width so as to form a mixed gas in the air inlet channel.
Further, the processor 1001 may call a cold start program of the engine stored in the memory 1002, and further perform the following operations:
a timing at which an intake valve of the engine is closed, and a timing at which an intake valve of the engine is opened again are determined according to a crank angle of the engine.
Further, the processor 1001 may call a cold start program of the engine stored in the memory 1002, and further perform the following operations:
and when the rotating speed of the engine is larger than the preset rotating speed, executing idle speed control, and stopping injecting the gasoline.
Referring to fig. 2, a first embodiment of the present invention provides a cold start method of an engine, the method including:
step S10, when the condition of cold start of the engine is detected to be met, a first injection pulse width and a second injection pulse width are obtained;
the first injection pulse width is a pulse width for controlling injection of methanol, and the second injection pulse width is a pulse width for controlling injection of gasoline. By adjusting the first injection pulse width and the second injection pulse width, the injection quantity of the methanol and the gasoline can be adjusted, so that the volume ratio of the methanol and the gasoline in the mixed gas is adjusted.
The molecules in the methanol liquid form association molecules through hydrogen bonds, and the hydrogen bonds formed by the association are broken, so that additional heat is consumed, and cold start is difficult. Methanol is used as a vehicle fuel, and is difficult to realize 'instant spraying and instant landing', namely the quick starting of an engine is difficult to realize when the ambient temperature is lower than 16 ℃ due to high latent heat value and polarity. Auxiliary measures must be used to improve evaporation and atomization of methanol and improve cold start performance of the engine.
Exemplary techniques, when improving cold start performance of an engine, take the following: adding a catalyst to crack methanol into carbon monoxide and hydrogen at high temperature under the action of the catalyst, so as to realize cold start; or adopting auxiliary heating measures, such as heating by an air inlet pipe and heating by an air inlet pipe; alternatively, the cold start may be performed directly using gasoline as fuel. In the above manner, since the gasoline filling is convenient, it is common to directly fill gasoline to perform cold start and switch to methanol as fuel, however, the manner has the problem of excessive gasoline filling times. Under the condition that methanol is used as main fuel, as the requirement of the endurance mileage is higher and higher, the volume of the methanol oil tank is large, the volume of the gasoline oil tank is smaller, and gasoline is directly used as fuel in each cold start, so that the gasoline consumption is faster, and the user is further required to fill the gasoline frequently. In the case of frequent fueling, the user experience is poor.
In order to avoid excessive filling times, in this embodiment, the consumption of gasoline during the cold start is slowed down, and instead, a mixed gas containing methanol and gasoline is used to perform the cold start. Since the filling station of the mixture is very few, it is actually difficult to perform cold start by directly filling the mixture, and for this reason, in the present embodiment, the mixture is generated in the intake duct at the cold start stage, and the user is not required to fill the mixture exclusively at the filling station.
The volume ratio of methanol is different, and the starting effect of the engine is different. As the volume ratio of methanol increases in sequence, the saturated vapor pressure increases and then decreases, and the higher the saturated vapor pressure, the easier the engine starts. Optionally, the volume ratio of the methanol in the mixed gas is 10% to 20%. When the volume ratio of methanol is in the interval, the cold start effect of the engine is better. Among them, the cold start of the engine is best when the volume ratio of methanol is 15%.
Alternatively, the engine cold start condition may be that the ambient temperature is less than a first preset temperature, and a command to start the engine is detected. Alternatively, the engine cold start condition may be that the detected engine water temperature is less than a second preset temperature, and the instruction to start the engine is detected. The first preset temperature is an ambient temperature threshold that satisfies a cold start condition. And a water temperature threshold meeting the cold start condition at a second preset temperature.
Step S20, injecting methanol into an air inlet channel of the engine according to the first injection pulse width, and injecting gasoline into the air inlet channel according to the second injection pulse width so as to form a mixed gas in the air inlet channel;
in order to achieve injection of methanol and gasoline into the inlet channel, respectively, gasoline injectors and methanol injectors may be arranged. Alternatively, the gasoline injector may be disposed on a cylinder head of the engine, or at a location near the engine in the intake manifold. Alternatively, the methanol injector may be arranged at a branch pipe of the intake manifold. Thereby realizing the independent control of the injection of methanol and the independent control of the injection of gasoline.
The vapor pressure of the mixed gas is higher than that of the methanol alone and that of the gasoline alone. The gasoline contains light hydrocarbon, and the 10% distillation temperature of the fuel obtained after the gasoline is mixed with the methanol is much lower than that of the pure gasoline or the pure methanol, so that the evaporation performance of the fuel is improved. Thus, the temperature of the distillate when the mixture is used as fuel is lower than the temperature of the distillate when only gasoline is used as cold start fuel, and lower than the temperature of the distillate when only methanol is used as cold start fuel. Cold start at lower ambient temperatures can be achieved based on increased vapor pressure and reduced 10% distillation temperature.
And step S30, performing cold start of the engine by adopting the mixed gas.
After the air intake passage forms the mixture, ignition and intake are controlled to be performed. Alternatively, ignition is controlled by the ignition advance angle MAP, and intake air is controlled by the throttle opening degree MAP. The rotational speed of the engine is increased to a certain rotational speed, that is, when the rotational speed of the engine is greater than a preset rotational speed, idle speed control is performed, and injection of gasoline is stopped, and control is performed by switching to a methanol fuel mode.
When cold start of the engine is performed using the mixture, cold start at a lower ambient temperature can be achieved due to the increased vapor pressure and the reduced 10% distillation temperature. That is, in the related art, when only gasoline is used as a fuel or only methyl is used as a fuel, there is a low ambient temperature range in which cold start cannot be achieved, but in the present embodiment, by injecting a mixture of methanol and gasoline, vapor pressure is increased and distillation temperature is reduced, and cold start of the engine can be further achieved in a lower ambient temperature range.
In this embodiment, when the cold start condition of the engine is satisfied, the first injection pulse width and the second injection pulse width are acquired, methanol is injected into the air inlet channel of the engine according to the first injection pulse width, and gasoline is injected into the air inlet channel according to the second injection pulse width, so as to form a mixture in the air inlet channel, and the engine is started by using the mixture. Wherein, respectively injecting methanol and gasoline, forming a mixed gas in the air inlet channel, and starting the engine by adopting the mixed gas. Because the acting forces of the methanol and the gasoline are different, the acting forces are weakened or destroyed after the mixed gas is formed, and partial components of the methanol and the gasoline are azeotroped, so that the saturated vapor pressure of the mixed gas is increased, and the cold start can be realized by adopting the mixed gas. Meanwhile, the gasoline contains light hydrocarbon, and the distillation temperature of the fuel after the gasoline is mixed with the methanol is lower than that of the fuel which is only gasoline or methanol, so that cold start at lower environmental temperature can be realized. On the basis of realizing cold start at a lower ambient temperature, the mixed gas comprises gasoline and methanol, so that the problem of high gasoline consumption speed under the condition of only adopting gasoline is solved. The consumption of gasoline during the cold start of the methanol engine can be slowed down.
Referring to fig. 3, a second embodiment of the present invention provides a cold start method of an engine, based on the first embodiment shown in fig. 2, the step S10 includes:
step S11, when the condition of cold start of the engine is detected to be met, acquiring a target temperature, wherein the target temperature is the ambient temperature or the water temperature of the engine;
the target temperature is a temperature for determining the injection pulse width. Alternatively, the target temperature is an ambient temperature or an engine water temperature. Under different ambient temperatures or different water temperatures, the injection amounts of the methanol and the gasoline required to be injected are different, wherein when the ambient temperature or the water temperature is lower, the injection amounts of the methanol and the gasoline required are more, so that the first injection pulse width and the second injection pulse width are larger, and when the ambient temperature or the water temperature is higher, the injection amounts of the methanol and the gasoline required are less, so that the first injection pulse width and the second injection pulse width are lower. It should be noted that neither the first injection pulse width nor the second injection pulse width is zero. In addition, in order to improve the performance of cold start, the second injection pulse width may be set to be larger than the first injection pulse width.
And step S12, determining the first injection pulse width and the second injection pulse width according to the target temperature.
Optionally, the injection amount of the methanol can be obtained according to a first corresponding relation between the target temperature and the injection amount of the methanol, and the first injection pulse width of the methanol can be determined according to the injection amount of the methanol; the injection quantity of the gasoline can be obtained according to the second corresponding relation between the target temperature and the injection quantity of the gasoline, and the injection pulse width of the gasoline can be obtained according to the injection quantity of the gasoline. Wherein, the higher the target temperature is, the lower the injection quantity of gasoline and the injection quantity of methanol is, and the smaller the first injection pulse width and the second injection pulse width are.
Wherein the first correspondence is a correspondence between a preset target temperature and a methanol injection amount. Alternatively, in the first correspondence, the target temperature corresponds one-to-one to the methanol injection amount. Or, in the first correspondence, the plurality of different target temperatures may all correspond to the same methanol injection amount, for example, a plurality of different target temperature intervals are defined, each of the target temperature intervals corresponds to a methanol injection amount, so that the plurality of target temperatures in each of the target temperature intervals all correspond to the same methanol injection amount. The second correspondence is a correspondence of a preset target temperature and a gasoline injection amount. Alternatively, in the second correspondence, the target temperature corresponds one-to-one to the gasoline injection amount. Alternatively, in the second correspondence relationship, the plurality of different target temperatures may each correspond to the same gasoline injection amount. For example, a plurality of different target temperature intervals are divided, and each target temperature interval corresponds to a gasoline injection amount, so that a plurality of target temperatures in the same target temperature interval correspond to the same gasoline injection amount.
In an embodiment, referring to fig. 4, fig. 4 is a flowchart of a method for obtaining a first injection pulse width and a second injection pulse width, wherein the step S12 includes the following steps:
step S121 of determining a first injection amount of the methanol and a second injection amount of the gasoline according to the target temperature and the rotation speed of the engine;
step S122, determining the first injection pulse width according to the first injection quantity, and determining the second injection pulse width according to the second injection quantity.
In order to accurately determine the first injection pulse width and the second injection pulse width, the first injection quantity of methanol and the second injection quantity of gasoline can be determined through the target temperature and the rotating speed of the engine, the first injection pulse width is determined according to the first injection quantity, and the second injection pulse width is determined according to the second injection quantity. And a third corresponding relation between the target temperature, the rotating speed and the first injection quantity under the index is measured in advance by taking the specific methanol extraction volume ratio as an index, the first injection quantity is obtained according to the third corresponding relation, a fourth corresponding relation between the target temperature, the rotating speed and the second injection quantity under the index is measured in advance, and the second injection quantity is obtained according to the fourth corresponding relation.
The first injection quantity is the injection quantity of injected methanol, and the second injection quantity is the injection quantity of injected gasoline. The third corresponding relation is a corresponding relation among a preset target temperature, a preset rotating speed and a preset first injection quantity. The fourth corresponding relation is the corresponding relation of the preset target temperature, the preset rotating speed and the second injection quantity.
Alternatively, the third correspondence relationship may specifically be a one-to-one correspondence relationship between the target temperature value, the rotation speed value, and the first injection amount. The fourth correspondence relationship may specifically be a one-to-one correspondence relationship between the target temperature value, the rotation speed value, and the second injection amount.
For example, the volume ratio of methanol is 15%, the volume ratio of gasoline is 85%, and the density of gasoline is 0.74g/cm 3 Methanol density of 0.79g/cm 3 . The corresponding third and fourth correspondence is exemplified as follows:
under the condition that the water temperature of the engine is minus 30 ℃ and the rotating speed of the engine is 100, the injection quantity of gasoline in each cycle is 679.99mg and the injection quantity of methanol is 108.89mg;
under the condition that the water temperature of the engine is minus 30 ℃ and the rotating speed of the engine is 600, the injection quantity of gasoline in each cycle is 635.08mg and the injection quantity of methanol is 101.70mg;
under the condition that the water temperature of the engine is 0 ℃ and the rotating speed of the engine is 100, the injection quantity of gasoline per cycle is 408.55mg and the injection quantity of methanol is 65.42mg;
when the engine water temperature was 0 ℃ and the engine speed was 600, the injection amount of gasoline per cycle was 242.79mg and the injection amount of methanol was 38.88mg.
Alternatively, the third correspondence relationship may specifically be a one-to-one correspondence relationship of the target temperature interval, the rotation speed interval, and the first injection amount interval. The fourth correspondence relationship may specifically be a one-to-one correspondence relationship among the target temperature zone, the rotation speed zone, and the second injection amount zone.
For example, when the water temperature of the engine is between-30 ℃ and 120 ℃ and the rotation speed of the engine is between 100 and 600, the injection amount of the gasoline corresponding to each cycle is between 48mg and 680mg; and, when the water temperature of the engine is between-30 ℃ and 120 ℃ and the rotating speed of the engine is between 100 and 600, the injection quantity of the methanol corresponding to each cycle is 8mg to 110mg.
The larger the rotation speed is, the smaller the corresponding first injection pulse width and the corresponding second injection pulse width are, and the higher the rotation speed is, the smaller the corresponding first injection pulse width and the corresponding second injection pulse width are.
In order to ensure that the engine has better cold start effect under the condition of lower temperature, the injection quantity of the corresponding gasoline and the injection quantity of the methanol are higher, so that the mixed gas with higher vapor pressure is formed conveniently, and in order to ensure that the engine slows down the consumption of the gasoline under the condition of higher temperature, the injection quantity of the corresponding gasoline and the injection quantity of the methanol are lower.
After the engine is started by using the mixture, in the case where the engine is not started successfully, the first injection pulse width and the second injection pulse width may be acquired again in the manner described in the present embodiment, and further, the execution returns to step S20. That is, after step S20, it is detected whether the engine is cold-started successfully, and if the engine is cold-started unsuccessfully, the target temperature and the rotation speed are re-detected, the first injection amount of methanol and the second injection amount of gasoline are updated based on the re-detected target temperature and the re-detected rotation speed, the first injection pulse width is determined based on the updated first injection amount of methanol, and the second injection pulse width is determined based on the second injection amount of gasoline.
After the first injection quantity and the second injection quantity are obtained, determining a first injection pulse width according to a fifth corresponding relation between the first injection quantity and the first injection pulse width, and determining a second injection pulse width according to a sixth corresponding relation between the second injection quantity and the second injection pulse width. The fifth corresponding relationship and the sixth corresponding relationship can be measured in advance.
The fifth corresponding relation is a corresponding relation between a preset first injection quantity and a first injection pulse width, and the sixth corresponding relation is a corresponding relation between a preset second injection quantity and a second injection pulse width.
In this embodiment, when the condition that the engine cold start condition is met is detected, a target temperature is obtained, the target temperature is an ambient temperature or an engine water temperature, and the first injection pulse width and the second injection pulse width are determined according to the target temperature, so that corresponding first injection pulse width and second injection pulse width can be obtained under different ambient temperatures or engine water temperatures, the corresponding first injection pulse width and second injection pulse width are lower under the condition that the target temperature is higher, the consumption of gasoline can be slowed down, and the corresponding first injection pulse width and second injection pulse width are larger under the condition that the temperature is lower, and the effect of engine cold start can be improved.
Referring to fig. 5, a third embodiment of the present invention provides a cold start method of an engine, based on the first embodiment shown in fig. 2, the step S20 includes:
step S21, after the time when the intake valve of the engine closes and before the time when the intake valve of the engine opens again, injecting methanol into the intake passage of the engine according to the first injection pulse width, and injecting gasoline into the intake passage according to the second injection pulse width, so as to form a mixture in the intake passage.
Before the engine starts, the electronic control unit (Electronic Control Unit, ECU) controls the injection timing of gasoline and the injection timing of methanol to be in a synchronous state, injection is completed after the inlet valve of the last working cycle of the engine is closed and before the inlet valve of the current working cycle is opened again, and mixed gas with a specific volume ratio is formed, and the mixed gas is fully evaporated and mixed in a cylinder cover air inlet passage of the engine.
The gasoline injector is arranged on a cylinder cover of the engine or a position of the intake manifold close to the engine, and the methanol injector is arranged on a branch pipe of the intake manifold, so that the injection of methanol and gasoline into the air inlet channel is independently controlled. The methanol and the gasoline in the air inlet channel form mixed gas.
Alternatively, a methanol injector and a gasoline injector inject fuel into the intake port upstream of the intake valve, and a cylinder receives the fuel from the intake port.
In a specific scenario, referring to fig. 6, fig. 6 is a control schematic diagram at the time of engine cold start, in which, when the ECU detects that the key is turned to the ON gear, the gasoline pump and the methanol pump relay are engaged, and the gasoline pump and the methanol pump work for 3 seconds simultaneously, so that the fuel supply pipeline of gasoline and the fuel supply pipeline of methanol are full of fuel, which is beneficial to normal injection of the methanol injector and the gasoline injector. And the key is rotated to a starting gear, the starter relay is attracted, and the starter works to drive the engine to rotate. In the rotation process of the engine, the crank shaft position sensor and the cam shaft position sensor identify whether synchronous according to the collected signals, and after synchronous information is monitored, fuel injection, ignition and air intake synchronous control are carried out. The injection of gasoline and methanol is controlled based on the injection cutoff angle MAP and the injection amount MAP, the ignition is controlled by the ignition advance angle MAP, and the intake is controlled by the throttle opening MAP.
The timing of the intake valve opening and the timing of the intake valve closing may be determined as follows: a timing at which an intake valve of the engine is closed, and a timing at which an intake valve of the engine is opened again are determined according to a crank angle of the engine.
A correspondence table of crank angle and opening and closing timing of the intake valve may be established in advance. According to the correspondence table, the timing at which the intake valve of the engine is closed and the timing at which the intake valve is opened again are determined in conjunction with the detected crank angle. And injection is completed after the intake valve is closed and before it is opened again.
In this embodiment, the mixture is formed in the intake passage by injecting methanol into the intake passage of the engine at the first injection pulse width after the timing at which the intake valve of the engine closes and before the timing at which the intake valve of the engine opens again, and injecting gasoline into the intake passage at the second injection pulse width. Thus, the formation of the mixture can be effectively controlled.
Referring to fig. 7, fig. 7 is a functional block diagram of a cold start apparatus of an engine according to an embodiment of the present invention, the apparatus includes an acquisition module 10, an injection module 20, and a start module 30, where:
the acquiring module 10 is configured to acquire a first injection pulse width and a second injection pulse width when the condition of cold start of the engine is detected to be satisfied;
the injection module 20 is configured to inject methanol into an intake passage of the engine according to the first injection pulse width, and inject gasoline into the intake passage according to the second injection pulse width, so as to form a mixture in the intake passage;
the start module 30 is configured to perform a cold start of the engine using the mixture.
In an embodiment, the obtaining module 10 is further configured to perform the following steps:
when the condition of the cold start of the engine is detected to be met, acquiring a target temperature, wherein the target temperature is the ambient temperature or the water temperature of the engine;
and determining the first injection pulse width and the second injection pulse width according to the target temperature.
In an embodiment, the apparatus further comprises a determining module for performing the steps of:
determining a first injection amount of the methanol and a second injection amount of the gasoline according to the target temperature and the rotation speed of the engine;
and determining the first injection pulse width according to the first injection quantity, and determining the second injection pulse width according to the second injection quantity.
In one embodiment, the device spray module 20 is further configured to perform the steps of:
and after the moment when the intake valve of the engine is closed and before the moment when the intake valve of the engine is opened again, injecting methanol into the air inlet channel of the engine according to the first injection pulse width, and injecting gasoline into the air inlet channel according to the second injection pulse width so as to form a mixed gas in the air inlet channel.
In an embodiment, the determining module is further configured to perform the steps of:
a timing at which an intake valve of the engine is closed, and a timing at which an intake valve of the engine is opened again are determined according to a crank angle of the engine.
In an embodiment, the device further comprises an idle speed control module for executing idle speed control to stop injecting the gasoline when the rotational speed of the engine is greater than a preset rotational speed.
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 one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising instructions for causing a cold start device of an engine to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (10)
1. A method of cold starting an engine, the method comprising:
when the condition of cold start of the engine is detected to be met, a first injection pulse width and a second injection pulse width are obtained;
injecting methanol into an air inlet channel of the engine according to the first injection pulse width, and injecting gasoline into the air inlet channel according to the second injection pulse width so as to form mixed gas in the air inlet channel;
and performing cold start of the engine by adopting the mixed gas.
2. The method for cold starting an engine according to claim 1, wherein the step of acquiring the first injection pulse width and the second injection pulse width when the satisfaction of the engine cold start condition is detected comprises:
when the condition of the cold start of the engine is detected to be met, acquiring a target temperature, wherein the target temperature is the ambient temperature or the water temperature of the engine;
and determining the first injection pulse width and the second injection pulse width according to the target temperature.
3. The method of cold start of an engine according to claim 2, wherein the step of determining the first injection pulse width and the second injection pulse width according to the target temperature includes:
determining a first injection amount of the methanol and a second injection amount of the gasoline according to the target temperature and the rotation speed of the engine;
and determining the first injection pulse width according to the first injection quantity, and determining the second injection pulse width according to the second injection quantity.
4. The method for cold starting an engine according to claim 1, wherein said injecting methanol into an intake passage of said engine according to said first injection pulse width and injecting gasoline into said intake passage according to said second injection pulse width to form a mixture in said intake passage comprises:
and after the moment when the intake valve of the engine is closed and before the moment when the intake valve of the engine is opened again, injecting methanol into the air inlet channel of the engine according to the first injection pulse width, and injecting gasoline into the air inlet channel according to the second injection pulse width so as to form a mixed gas in the air inlet channel.
5. The method for cold starting an engine according to claim 4, wherein said injecting methanol into an intake passage of said engine at said first injection pulse width and injecting gasoline into said intake passage at said second injection pulse width after said intake valve of said engine is closed and before said intake valve of said engine is opened again, further comprises, before said step of forming a mixture in said intake passage:
a timing at which an intake valve of the engine is closed, and a timing at which an intake valve of the engine is opened again are determined according to a crank angle of the engine.
6. The method for cold starting an engine according to claim 1, further comprising, after said step of performing start-up of said engine using said air-fuel mixture:
and when the rotating speed of the engine is larger than the preset rotating speed, executing idle speed control, and stopping injecting the gasoline.
7. The method for cold starting an engine according to any one of claims 1 to 6, wherein the volume ratio of the methanol in the mixture is 10% to 20%.
8. A cold start device of an engine, the device comprising an acquisition module, an injection module, and a start module, wherein:
the acquisition module is used for acquiring a first injection pulse width and a second injection pulse width when the condition of cold start of the engine is detected to be met;
the injection module is used for injecting methanol into an air inlet channel of the engine according to the first injection pulse width and injecting gasoline into the air inlet channel according to the second injection pulse width so as to form mixed gas in the air inlet channel;
the starting module is used for executing cold starting of the engine by adopting the mixed gas.
9. A vehicle comprising a memory, a processor and a cold start program of an engine stored on the memory and operable on the processor, which when executed by the processor, performs the steps of the cold start method of an engine as claimed in any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a cold start program of an engine, which when executed by a processor, implements the steps of the cold start method of an engine according to any one of claims 1 to 7.
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| CN106481462B (en) * | 2016-11-21 | 2019-08-23 | 浙江吉利控股集团有限公司 | A kind of methanol engine cold start system |
| CN109915271B (en) * | 2019-02-21 | 2021-08-13 | 浙江吉利控股集团有限公司 | Control method of methanol engine fuel injection amount, electronic control unit and vehicle |
| CN112483244A (en) * | 2020-11-22 | 2021-03-12 | 贵州大学 | Methanol engine gasoline auxiliary cold start fuel supply system |
| CN112664341A (en) * | 2020-11-28 | 2021-04-16 | 贵州大学 | Methanol automobile self-adaptive starting method based on automatic fuel identification |
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