CN116181511B - Thermodynamic-based dual fuel injection quantity control method, device, equipment and medium - Google Patents
Thermodynamic-based dual fuel injection quantity control method, device, equipment and medium Download PDFInfo
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- 238000002347 injection Methods 0.000 title claims abstract description 171
- 239000007924 injection Substances 0.000 title claims abstract description 171
- 238000000034 method Methods 0.000 title claims abstract description 43
- 230000009977 dual effect Effects 0.000 title claims abstract description 39
- 230000017525 heat dissipation Effects 0.000 claims abstract description 38
- 238000006467 substitution reaction Methods 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 239000003921 oil Substances 0.000 claims description 77
- 230000006835 compression Effects 0.000 claims description 34
- 238000007906 compression Methods 0.000 claims description 34
- 230000002093 peripheral effect Effects 0.000 claims description 21
- 238000012937 correction Methods 0.000 claims description 20
- 238000002485 combustion reaction Methods 0.000 claims description 17
- 238000004590 computer program Methods 0.000 claims description 17
- 239000000498 cooling water Substances 0.000 claims description 9
- 239000000295 fuel oil Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 15
- 238000004364 calculation method Methods 0.000 description 12
- 238000004891 communication Methods 0.000 description 8
- 239000003345 natural gas Substances 0.000 description 7
- 238000012545 processing Methods 0.000 description 7
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- 230000001276 controlling effect Effects 0.000 description 4
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- 238000009792 diffusion process Methods 0.000 description 3
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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
- F02D41/30—Controlling fuel injection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- 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
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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
- F02D19/0602—Control of components of the fuel supply system
- F02D19/0613—Switch-over from one fuel to another
-
- 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]
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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
- F02D41/3005—Details not otherwise provided for
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a thermodynamic-based dual fuel injection quantity control method, a thermodynamic-based dual fuel injection quantity control device, a thermodynamic-based dual fuel injection quantity control equipment and a thermodynamic-based dual fuel injection quantity control medium. The method comprises the following steps: determining a target total fuel quantity required by the engine at a current engine speed and a current throttle position; determining a target heat amount based on a first parameter of the engine; determining a total heat dissipation capacity of the cylinder based on a second parameter of the engine; determining a pilot oil injection amount based on the target heat, the total heat dissipation of the cylinder, and the pilot oil heating value; the main injection fuel amount and the substitution rate are determined based on the target total fuel amount and the pilot oil injection amount. According to the scheme, based on the engine state, the target total fuel quantity and the pilot oil injection quantity are determined, so that the main injection fuel quantity and the substitution rate are accurately determined, the problem that the pilot fuel injection quantity of the dual-fuel engine cannot be correspondingly adjusted along with the engine state and the working environment condition is solved, the highest main injection fuel substitution rate is obtained, and the application requirements of customers are met.
Description
Technical Field
The invention relates to the field of energy conservation and emission reduction of engines, in particular to a thermodynamic-based dual fuel injection quantity control method, a thermodynamic-based dual fuel injection quantity control device, a thermodynamic-based dual fuel injection quantity control equipment and a thermodynamic-based dual fuel injection quantity control medium.
Background
Natural gas has the physicochemical properties of rich reserves, clean combustion, easy mixing with air and the like, and becomes a novel fuel for replacing traditional fuels such as diesel oil, gasoline and the like.
The natural gas is used as the substitute fuel for reducing carbon emission, the duty ratio of a natural gas engine on a power assembly is higher and higher, the thermal efficiency of the natural gas engine is lower than that of a diesel engine in a traditional ignition type premixed combustion mode, the natural gas is ignited by adopting diesel to realize the diffusion combustion of the natural gas, the thermal efficiency equivalent to that of the diesel is obtained, and the low-temperature exhaust, the low NOx and the low CH4 emission can be realized.
At present, the pilot fuel injection quantity of the dual-fuel engine is fixedly injected according to the calibration process result, for example, the fixed pilot diesel quantity is calibrated in advance, and the fixed pilot diesel quantity is directly injected when the dual-fuel engine is used, so that the pilot fuel injection quantity cannot be correspondingly adjusted along with the state of the engine and the working environment conditions (such as pressure and temperature change), and the highest fuel substitution rate cannot be obtained.
Disclosure of Invention
The invention provides a thermodynamic-based dual-fuel injection quantity control method, a thermodynamic-based dual-fuel injection quantity control device, a thermodynamic-based dual-fuel injection quantity control equipment and a thermodynamic-based dual-fuel injection quantity control medium, which are used for solving the problem that the ignition fuel injection quantity of a dual-fuel engine cannot be adjusted correspondingly along with the state of the engine and the working environment conditions.
According to an aspect of the present invention, there is provided a thermodynamic-based dual fuel injection quantity control method, the method comprising:
determining a target total fuel quantity required by an engine under the current engine speed and the current accelerator position, wherein the engine is a dual-fuel engine, and the dual fuel is pilot fuel oil and main injection fuel;
Determining a target heat amount based on a first parameter of the engine; the first parameters comprise single-cylinder circulation air inflow, target average temperature and compression end temperature; the target average temperature is determined based on thermodynamic properties of the main injection fuel;
determining a total heat dissipation capacity of the cylinder based on a second parameter of the engine; the second parameters comprise injection time difference, average heat exchange coefficient of the cylinder peripheral wall, average temperature of a piston, piston top area, cylinder cover area, average temperature of the cylinder cover, average temperature of a cylinder sleeve and wet peripheral area of the cylinder sleeve;
determining a pilot oil injection amount based on the target heat, the total heat dissipation of the cylinder, and the pilot oil heating value;
a main injection fuel amount and a substitution rate are determined based on the target total fuel amount and pilot oil injection amount.
According to another aspect of the present invention, there is provided a thermodynamic-based dual fuel injection quantity control device, the device comprising:
the target total fuel quantity determining module is used for determining the target total fuel quantity required by the engine at the current engine speed and the current accelerator position, wherein the engine is a dual-fuel engine, and the dual fuel is pilot fuel and main injection fuel;
A heat determination module to determine a target heat based on a first parameter of the engine; the first parameters comprise single-cylinder circulation air inflow, target average temperature and compression end temperature; the target average temperature is determined based on thermodynamic properties of the main injection fuel;
The heat dissipation capacity determining module is used for determining the total heat dissipation capacity of the cylinder based on a second parameter of the engine; the second parameters comprise injection time difference, average heat exchange coefficient of the cylinder peripheral wall, average temperature of a piston, piston top area, cylinder cover area, average temperature of the cylinder cover, average temperature of a cylinder sleeve and wet peripheral area of the cylinder sleeve;
a pilot oil injection amount determination module for determining a pilot oil injection amount based on the target heat amount, the total heat dissipation amount of the cylinder, and the pilot oil heating value;
a main injection fuel amount determination module for determining a main injection fuel amount and a substitution rate based on the target total fuel amount and the pilot oil injection amount.
According to another aspect of the present invention, there is provided an electronic apparatus including:
at least one processor; and
A memory communicatively coupled to the at least one processor; wherein,
The memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the thermodynamic-based dual fuel injection quantity control method of any one of the embodiments of the present invention.
According to another aspect of the present invention, there is provided a computer readable storage medium storing computer instructions for causing a processor to execute the thermodynamic-based dual fuel injection quantity control method according to any one of the embodiments of the present invention.
According to the technical scheme, the target total fuel quantity required by the engine is determined under the current engine speed and the current accelerator position, the engine is a dual-fuel engine, and the dual fuel is pilot fuel oil and main injection fuel; simultaneously, determining a target heat amount based on a first parameter of the engine; the first parameters comprise single-cylinder circulation air inflow, target average temperature and compression end temperature; the target average temperature is determined based on thermodynamic properties of the main injection fuel; and determining a total heat dissipation capacity of the cylinder based on a second parameter of the engine; the second parameters comprise injection time difference, average heat exchange coefficient of the cylinder peripheral wall, average temperature of a piston, piston top area, cylinder cover area, average temperature of the cylinder cover, average temperature of a cylinder sleeve and wet peripheral area of the cylinder sleeve; further, a pilot oil injection amount is determined based on the target heat amount, the total heat dissipation amount of the cylinder, and the pilot oil heating value; finally, a main injection fuel amount and a substitution rate are determined based on the target total fuel amount and pilot oil injection amount. According to the scheme, based on the engine state, the target total fuel quantity and the pilot oil injection quantity are accurately determined through the current engine rotating speed and the current accelerator position which are acquired in real time, so that the main injection fuel quantity and the substitution rate of the main injection fuel quantity are accurately determined, the problem that the pilot fuel injection quantity of the dual-fuel engine cannot be correspondingly regulated along with the engine state and the working environment condition is solved, the highest main injection fuel substitution rate is obtained, and the application requirements of customers are met.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for controlling fuel injection quantity based on thermodynamics according to a first embodiment of the present invention;
FIG. 2 is a flow chart of a target total fuel amount determination applicable in accordance with an embodiment of the present invention;
FIG. 3 is a flow chart of a target heat determination applicable in accordance with an embodiment of the present invention;
FIG. 4 is a flow chart of a cylinder total heat dissipation capacity determination adapted according to an embodiment of the present invention;
FIG. 5 is a flow chart of pilot oil injection quantity, main injection fuel quantity, and substitution rate determination, as applicable in accordance with an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a dual fuel injection quantity control device based on thermodynamics according to a second embodiment of the present invention;
Fig. 7 is a schematic structural diagram of an electronic device implementing a thermodynamic-based dual fuel injection quantity control method according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and "object" in the description of the present invention and the claims and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 1 is a flowchart of a method for controlling a dual fuel injection amount based on thermodynamics according to a first embodiment of the present invention, which is applicable to a case of controlling a dual fuel injection amount of a dual fuel engine, and the method may be performed by a thermodynamic-based dual fuel injection amount control device, which may be implemented in the form of hardware and/or software, and which may be configured in an electronic apparatus having the thermodynamic-based dual fuel injection amount control method. As shown in fig. 1, the method includes:
S110, determining a target total fuel quantity required by the engine at the current engine speed and the current accelerator position, wherein the engine is a dual-fuel engine, and the dual fuel is pilot fuel oil and main injection fuel.
According to the scheme, based on the pilot combustion requirement of the diffusion combustion process of the main injection fuel (such as natural gas), the temperature state of working medium in a motor cylinder reaches the pilot combustion requirement of the main injection fuel, and based on the air inlet parameter, the basic engine parameter and the combustion of the pilot fuel, the calculation method of the injection quantity of the pilot fuel is determined, the strategy of controlling the injection quantity of the pilot fuel and the main injection fuel is realized, and the requirement of the diffusion combustion of the main injection fuel is met.
Optionally, determining the target total fuel amount required by the engine at the current engine speed and the current throttle position includes steps A1-A3:
and A1, acquiring the current engine speed and the current throttle position.
A2, determining a required torque through an output torque relation table and a friction torque relation table based on the current engine speed and the current accelerator position; the output torque relation table is used for describing the relation between the current engine speed and the current accelerator position and the output torque; the friction torque relationship table is used to describe the relationship of the current engine speed to friction torque.
A3, determining a target total fuel amount through a rotational speed torque relation table based on the required torque and the current engine rotational speed; the rotational speed torque relationship table is used to describe the relationship between the requested torque and the current engine speed and the target total fuel amount.
The output torque relation table, the friction torque relation table and the rotating speed torque relation table are calibrated in advance, and any calibration method is not limited.
Specifically, the scheme adopts a sensor capable of acquiring the position of the accelerator pedal to acquire the position of the accelerator, and adopts an engine speed sensor to acquire the engine speed. Then the current throttle position is acquired by using a sensor having the capability of acquiring the throttle pedal position, while the current engine speed is acquired by the engine speed sensor.
FIG. 2 is a flow chart of a target total fuel amount determination applicable to an embodiment of the present invention, see FIG. 2, wherein the current engine speed and the current throttle position are determined to an output torque M 0 by querying an output torque relationship table, and simultaneously, the current engine speed is queried to a friction torque M f by querying a friction torque relationship table, and the output torque M 0 and the friction torque M f are added to a required torque M T, i.e., M T＝M0+Mf. And then the target total fuel quantity Q is obtained by inquiring the rotation speed torque relation table between the rotation speed of the front engine and the required torque.
According to the technical scheme, after the current engine rotating speed and the current accelerator position are acquired in real time, the output torque relation table, the friction torque relation table and the rotating speed torque relation table are further inquired and calculated, so that the target total fuel quantity is accurately acquired.
S120, determining target heat based on a first parameter of the engine; the first parameters comprise single-cylinder circulation air inflow, target average temperature and compression end temperature; the target average temperature is determined based on thermodynamic properties of the main injection fuel.
Specifically, after the single-cylinder circulation air inflow, the target average temperature and the compression end temperature are accurately determined, the target heat quantity can be accurately determined through calculation.
Alternatively, fig. 3 is a flowchart of target heat determination to which the embodiment of the invention is applied, and referring to fig. 3, the single cylinder circulation intake air amount G a is determined by calculation based on the intake charge coefficient η v, the engine working volume V s, the intake manifold temperature T a, and the intake manifold pressure P a, which can be expressed by the following formula:
The intake charge coefficient is an intake charge coefficient at the current engine speed and can be obtained by inquiring a charge coefficient relation table based on the current engine speed and the intake manifold pressure. The intake manifold temperature and intake manifold pressure are obtained by an intake manifold temperature pressure sensor. The engine working volume is calculated by the engine cylinder diameter D and the engine stroke S, and is specifically: v s＝0.25πD2 x S.
Meanwhile, the compression end temperature T 1 is determined by calculation based on the intake manifold temperature T a and the engine compression ratio epsilon, which can be expressed as: t 1＝Ta×εγ-1. Wherein, gamma is a polytropic index, and 1.3-1.4 is preferable.
Finally, the single cylinder circulation intake air amount G a, the compression end temperature T1, and the target average temperature T are calculated to determine the target heat quantity H a, which can be expressed by the following formula: h a＝Cp×Ga×(T-T1)×10-3. Wherein C p is the specific heat capacity of the intake air.
According to the technical scheme, the single-cylinder circulation air inflow and the compression end temperature are accurately obtained through accurate calculation, so that the target average temperature is combined, and the accurate determination of the target heat is realized through calculation.
S130, determining the total heat dissipation capacity of the cylinder based on a second parameter of the engine; the second parameter includes injection time difference, average heat exchange coefficient of cylinder peripheral wall, average piston temperature, piston top area, cylinder head area, average cylinder head temperature, average cylinder liner temperature, and wet cylinder liner area.
Specifically, after the injection time difference, the average heat exchange coefficient of the cylinder peripheral wall, the average temperature of the piston, the piston top area, the cylinder head area, the average temperature of the cylinder head, the average temperature of the cylinder liner and the wet peripheral area of the cylinder liner are accurately determined, the total heat dissipation capacity of the cylinder can be accurately determined through calculation.
Optionally, fig. 4 is a flowchart of determining a total heat dissipation capacity of a cylinder, which is applicable to an embodiment of the present invention, referring to fig. 4, based on a target total fuel amount and a current engine speed, by querying a pilot oil advance angle relation table and a main injection advance angle relation table, acquiring a pilot oil advance angle θ 2 and a main injection advance angle θ 1, and by combining the current engine speed, determining an injection time difference t f by calculation, specifically, may be expressed as the following formula:
tf＝(θ2-θ1)/(0.006n)×10-3；
Meanwhile, optionally, by determining the compression end pressure P 1 based on the intake manifold pressure P a and the engine compression ratio epsilon, it can be formulated as: p 1＝Pa×εγ, where γ is a polytropic exponent, preferably 1.3-1.4, and then multiplying the target average temperature by the ratio of the compression end pressure to the compression end temperature, as the pilot oil combustion end average pressure P, specifically expressed as: p=t×p 1/T1.
Further, the average pressure P of the pilot oil combustion is obtained by the method, and the average heat exchange coefficient alpha g of the cylinder peripheral wall is determined by calculation by combining the engine cylinder diameter D, the target average temperature T, the engine working volume V s, the intake manifold temperature T a and the intake manifold pressure P a, and can be expressed by the following formula:
where V a is the cylinder volume when the intake valve is closed.
C1＝2.28×106+3.08×105×Cu/Cm；
C2＝3.24×10-3；
Cm＝S.n/30；
Cu＝πD×nD；
Wherein n D is the fan speed measured by a rotating blade anemometer with a fan diameter of 0.7D in a static blowing test; p 0 is the cylinder pressure when the engine is being towed upside down.
Finally, the injection time difference t f, the average heat exchange coefficient alpha g, the engine structural parameter and the temperature parameter are calculated to determine the total heat dissipation capacity H w of the cylinder, and the total heat dissipation capacity H w of the cylinder can be specifically expressed by the following formula:
Hw＝(αg×Sh×(T-Th)+αg×Sp×(T-Tp)+αg×Sc×(T-Tc))×tf;
The engine structure parameters comprise a piston top area S p, a cylinder cover area S h and a cylinder sleeve wet circumference area S c; the temperature parameters include piston average temperature T p, cylinder head average temperature T h, and cylinder liner average temperature T c. The wet circumferential area of the cylinder sleeve can be determined through calculation through the engine cylinder diameter D and the head clearance height delta, and specifically comprises the following steps: s c = pi D x delta.
And S140, determining the pilot oil injection quantity based on the target heat quantity, the total heat dissipation capacity of the cylinder and the pilot oil heat value.
Specifically, fig. 5 is a flowchart of pilot oil injection amount, main injection fuel amount, and substitution rate determination, which are applicable according to the embodiment of the present invention, referring to fig. 5, based on the target heat amount H a, the cylinder total heat dissipation amount H w, and the pilot oil heat value Q d, the pilot oil minimum injection amount Q d1 is determined by calculation, which may be expressed specifically as: q d1＝Hp/qd,Hp＝Ha+Hw.
Meanwhile, determining a correction coefficient eta d through a pilot oil injection quantity correction relation table based on the current engine speed and the cooling water temperature T w, wherein the pilot oil injection quantity correction relation table is used for describing the relation between the current engine speed and the cooling water temperature and the correction coefficient; the temperature of the cooling water can be acquired by a water temperature sensor. Finally, the product of the pilot oil minimum injection amount Q d1 and the correction coefficient η d is taken as the pilot oil injection amount Q d, specifically expressed as: q d＝Qd1×ηd.
And S150, determining a main injection fuel quantity and a substitution rate based on the target total fuel quantity and the pilot oil injection quantity.
Specifically, referring to fig. 5, the conversion factor a, i.e., a=q d/qg, is determined from the main injection fuel heating value q g and the pilot oil heating value q d; the target total fuel quantity Q, the pilot oil injection quantity Q d, and the conversion coefficient a are calculated to determine the main injection fuel quantity Q g, which can be expressed as: q g＝Q-Qd x a. Meanwhile, the ratio of the main injection fuel amount to the target total fuel amount is taken as a substitution rate η g, that is, η g＝Qg/Q.
According to the technical scheme, the target total fuel quantity required by the engine is determined under the current engine speed and the current accelerator position, the engine is a dual-fuel engine, and the dual fuel is pilot fuel oil and main injection fuel; simultaneously, determining a target heat amount based on a first parameter of the engine; the first parameters comprise single-cylinder circulation air inflow, target average temperature and compression end temperature; the target average temperature is determined based on thermodynamic properties of the main injection fuel; and determining a total heat dissipation capacity of the cylinder based on a second parameter of the engine; the second parameters comprise injection time difference, average heat exchange coefficient of the cylinder peripheral wall, average temperature of a piston, piston top area, cylinder cover area, average temperature of the cylinder cover, average temperature of a cylinder sleeve and wet peripheral area of the cylinder sleeve; further, a pilot oil injection amount is determined based on the target heat amount, the total heat dissipation amount of the cylinder, and the pilot oil heating value; finally, a main injection fuel amount and a substitution rate are determined based on the target total fuel amount and pilot oil injection amount. According to the scheme, based on the engine state, the target total fuel quantity and the pilot oil injection quantity are determined, so that the main injection fuel quantity and the substitution rate are accurately determined, the problem that the pilot fuel injection quantity of the dual-fuel engine cannot be correspondingly adjusted along with the engine state and the working environment condition is solved, the highest main injection fuel substitution rate is obtained, and the application requirements of customers are met.
Example two
Fig. 6 is a schematic structural diagram of a dual fuel injection quantity control device based on thermodynamics according to a third embodiment of the present invention. As shown in fig. 6, the apparatus includes:
A target total fuel amount determination module 210, configured to determine a target total fuel amount required by an engine at a current engine speed and a current throttle position, where the engine is a dual-fuel engine, and the dual fuel is pilot fuel and main fuel;
A heat determination module 220 for determining a target heat based on a first parameter of the engine; the first parameters comprise single-cylinder circulation air inflow, target average temperature and compression end temperature; the target average temperature is determined based on thermodynamic properties of the main injection fuel;
A heat dissipation capacity determination module 230 for determining a total heat dissipation capacity of the cylinders based on a second parameter of the engine; the second parameters comprise injection time difference, average heat exchange coefficient of the cylinder peripheral wall, average temperature of a piston, piston top area, cylinder cover area, average temperature of the cylinder cover, average temperature of a cylinder sleeve and wet peripheral area of the cylinder sleeve;
A pilot oil injection amount determination module 240 for determining a pilot oil injection amount based on the target heat amount, the total heat dissipation capacity of the cylinder, and the pilot oil heating value;
A main injection fuel amount determination module 250 for determining a main injection fuel amount and a substitution rate based on the target total fuel amount and pilot oil injection amount.
Optionally, the target total fuel amount determining module is specifically configured to:
acquiring the current engine speed and the current throttle position;
determining a required torque through an output torque relation table and a friction torque relation table based on the current engine speed and the current throttle position; the output torque relation table is used for describing the relation between the current engine speed and the current accelerator position and the output torque; the friction torque relation table is used for describing the relation between the current engine speed and friction torque;
determining a target total fuel amount through a rotational speed torque relationship table based on the requested torque and the current engine rotational speed; the rotational speed torque relationship table is used to describe the relationship between the requested torque and the current engine speed and the target total fuel amount.
Optionally, the heat determining module is specifically configured to:
Determining a single cylinder circulation air inflow based on the air intake charge coefficient, the engine working volume, the air intake manifold temperature and the air intake manifold pressure;
determining a compression end temperature based on the intake manifold temperature and the engine compression ratio;
and determining the target heat quantity through calculation of the single-cylinder circulation air inflow, the compression end temperature and the target average temperature.
Optionally, the heat dissipation capacity determining module is specifically configured to:
acquiring an pilot oil advance angle and a main injection advance angle, and determining an injection time difference by combining the current engine speed;
acquiring the final average pressure of pilot fuel oil combustion, and determining the average heat exchange coefficient of the peripheral wall of the cylinder by combining the engine cylinder diameter, the target average temperature, the engine working volume, the air inlet main pipe temperature and the air inlet main pipe pressure;
calculating the injection time difference, the average heat exchange coefficient, the engine structural parameter and the temperature parameter, and determining the total heat dissipation capacity of the air cylinder; the engine structural parameters comprise piston top area, cylinder cover area and cylinder sleeve wet circumference area; the temperature parameters comprise average temperature of a piston, average temperature of a cylinder cover and average temperature of a cylinder sleeve;
Optionally, the heat dissipation capacity determining module includes a pilot oil combustion final average pressure determining unit, specifically configured to:
determining a compression end pressure based on the intake manifold pressure and the engine compression ratio;
Multiplying the target average temperature by a ratio of the compression end pressure to the compression end temperature as a pilot oil combustion end average pressure.
Optionally, the pilot oil injection amount determining module is specifically configured to:
determining a minimum injection amount of pilot oil based on the target heat, the total heat dissipation of the cylinder, and the pilot total oil heating value;
Determining a correction coefficient through a pilot oil injection quantity correction relation table based on the current engine speed and the cooling water temperature; the pilot oil injection quantity correction relation table is used for describing the relation between the current engine speed and the cooling water temperature and the correction coefficient;
And taking the product of the minimum injection quantity of the pilot oil and the correction coefficient as the injection quantity of the pilot oil.
Optionally, the main injection fuel amount determining module is specifically configured to:
Determining a conversion coefficient according to the main injection fuel heat value and the pilot oil heat value;
and determining the main injection fuel amount by calculating the target total fuel amount, the pilot oil injection amount and the conversion coefficient, and taking the ratio of the main injection fuel amount to the target total fuel amount as a substitution rate.
The thermodynamic-based dual-fuel injection quantity control device provided by the embodiment of the invention can execute the thermodynamic-based dual-fuel injection quantity control method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
The technical scheme of the application is used for acquiring, storing, using and processing the data, and the like, which accords with the relevant regulations of national laws and regulations and does not violate the popular public order.
Example III
According to embodiments of the present disclosure, the present disclosure also provides an electronic device, a readable storage medium and a computer program product.
Fig. 7 shows a schematic diagram of an electronic device that may be used to implement the thermodynamic-based dual fuel injection quantity control method of an embodiment of the present invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. Electronic equipment may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 7, the electronic device 10 includes at least one processor 11, and a memory, such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, etc., communicatively connected to the at least one processor 11, in which the memory stores a computer program executable by the at least one processor, and the processor 11 may perform various appropriate actions and processes according to the computer program stored in the Read Only Memory (ROM) 12 or the computer program loaded from the storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 may also be stored. The processor 11, the ROM 12 and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
Various components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, etc.; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, an optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunication networks.
The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as the thermodynamic-based dual fuel injection quantity control method.
In some embodiments, the thermodynamically based dual fuel injection amount control method may be implemented as a computer program tangibly embodied on a computer readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 10 via the ROM 12 and/or the communication unit 19. When a computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the thermodynamic-based dual fuel injection quantity control method described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the thermodynamically based dual fuel injection amount control method by any other suitable means (e.g., by means of firmware).
Various implementations of the systems and techniques described here above can be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), complex Programmable Logic Devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (7)
1. A thermodynamic-based dual fuel injection quantity control method, comprising:
determining a target total fuel quantity required by an engine under the current engine speed and the current accelerator position, wherein the engine is a dual-fuel engine, and the dual fuel is pilot fuel oil and main injection fuel;
Determining a target heat amount based on a first parameter of the engine; the first parameters comprise single-cylinder circulation air inflow, target average temperature and compression end temperature; the target average temperature is determined based on thermodynamic properties of the main injection fuel;
determining a total heat dissipation capacity of the cylinder based on a second parameter of the engine; the second parameters comprise injection time difference, average heat exchange coefficient of the cylinder peripheral wall, average temperature of a piston, piston top area, cylinder cover area, average temperature of the cylinder cover, average temperature of a cylinder sleeve and wet peripheral area of the cylinder sleeve;
determining a pilot oil injection amount based on the target heat, the total heat dissipation of the cylinder, and the pilot oil heating value;
determining a main injection fuel amount and a substitution rate based on the target total fuel amount and pilot oil injection amount;
wherein determining the target heat based on the first parameter of the engine comprises:
Determining a single cylinder circulation air inflow based on the air intake charge coefficient, the engine working volume, the air intake manifold temperature and the air intake manifold pressure;
determining a compression end temperature based on the intake manifold temperature and the engine compression ratio;
Calculating the single-cylinder circulation air inflow, the compression end temperature and the target average temperature to determine target heat;
wherein determining the total heat dissipation capacity of the cylinder based on the second parameter of the engine comprises:
acquiring an pilot oil advance angle and a main injection advance angle, and determining an injection time difference by combining the current engine speed;
acquiring the final average pressure of pilot fuel oil combustion, and determining the average heat exchange coefficient of the peripheral wall of the cylinder by combining the engine cylinder diameter, the target average temperature, the engine working volume, the air inlet main pipe temperature and the air inlet main pipe pressure;
calculating the injection time difference, the average heat exchange coefficient, the engine structural parameter and the temperature parameter, and determining the total heat dissipation capacity of the air cylinder; the engine structural parameters comprise piston top area, cylinder cover area and cylinder sleeve wet circumference area; the temperature parameters comprise average temperature of a piston, average temperature of a cylinder cover and average temperature of a cylinder sleeve;
Wherein determining the pilot oil injection amount based on the target heat amount, the total heat dissipation amount of the cylinder, and the pilot oil heating value includes:
Determining a pilot oil minimum injection amount based on the target heat, the total heat dissipation of the cylinder, and the pilot oil heating value;
Determining a correction coefficient through a pilot oil injection quantity correction relation table based on the current engine speed and the cooling water temperature; the pilot oil injection quantity correction relation table is used for describing the relation between the current engine speed and the cooling water temperature and the correction coefficient;
And taking the product of the minimum injection quantity of the pilot oil and the correction coefficient as the injection quantity of the pilot oil.
2. The method of claim 1, wherein determining the target total fuel amount required by the engine at the current engine speed and the current throttle position comprises:
acquiring the current engine speed and the current throttle position;
determining a required torque through an output torque relation table and a friction torque relation table based on the current engine speed and the current throttle position; the output torque relation table is used for describing the relation between the current engine speed and the current accelerator position and the output torque; the friction torque relation table is used for describing the relation between the current engine speed and friction torque;
determining a target total fuel amount through a rotational speed torque relationship table based on the requested torque and the current engine rotational speed; the rotational speed torque relationship table is used to describe the relationship between the requested torque and the current engine speed and the target total fuel amount.
3. The method of claim 1, wherein obtaining the pilot oil combustion ending average pressure comprises:
determining a compression end pressure based on the intake manifold pressure and the engine compression ratio;
Multiplying the target average temperature by a ratio of the compression end pressure to the compression end temperature as a pilot oil combustion end average pressure.
4. The method of claim 1, wherein determining a main injection fuel amount and a substitution rate based on the target total fuel amount and pilot oil injection amount comprises:
Determining a conversion coefficient according to the main injection fuel heat value and the pilot oil heat value;
and determining the main injection fuel amount by calculating the target total fuel amount, the pilot oil injection amount and the conversion coefficient, and taking the ratio of the main injection fuel amount to the target total fuel amount as a substitution rate.
5. A thermodynamic-based dual fuel injection amount control device, comprising:
the target total fuel quantity determining module is used for determining the target total fuel quantity required by the engine at the current engine speed and the current accelerator position, wherein the engine is a dual-fuel engine, and the dual fuel is pilot fuel and main injection fuel;
A heat determination module to determine a target heat based on a first parameter of the engine; the first parameters comprise single-cylinder circulation air inflow, target average temperature and compression end temperature; the target average temperature is determined based on thermodynamic properties of the main injection fuel;
The heat dissipation capacity determining module is used for determining the total heat dissipation capacity of the cylinder based on a second parameter of the engine; the second parameters comprise injection time difference, average heat exchange coefficient of the cylinder peripheral wall, average temperature of a piston, piston top area, cylinder cover area, average temperature of the cylinder cover, average temperature of a cylinder sleeve and wet peripheral area of the cylinder sleeve;
a pilot oil injection amount determination module for determining a pilot oil injection amount based on the target heat amount, the total heat dissipation amount of the cylinder, and the pilot oil heating value;
A main injection fuel amount determination module for determining a main injection fuel amount and a substitution rate based on the target total fuel amount and pilot oil injection amount;
Wherein, the heat determination module is used for:
Determining a single cylinder circulation air inflow based on the air intake charge coefficient, the engine working volume, the air intake manifold temperature and the air intake manifold pressure;
determining a compression end temperature based on the intake manifold temperature and the engine compression ratio;
Calculating the single-cylinder circulation air inflow, the compression end temperature and the target average temperature to determine target heat;
wherein, the heat dissipation capacity confirms the module for:
acquiring an pilot oil advance angle and a main injection advance angle, and determining an injection time difference by combining the current engine speed;
acquiring the final average pressure of pilot fuel oil combustion, and determining the average heat exchange coefficient of the peripheral wall of the cylinder by combining the engine cylinder diameter, the target average temperature, the engine working volume, the air inlet main pipe temperature and the air inlet main pipe pressure;
calculating the injection time difference, the average heat exchange coefficient, the engine structural parameter and the temperature parameter, and determining the total heat dissipation capacity of the air cylinder; the engine structural parameters comprise piston top area, cylinder cover area and cylinder sleeve wet circumference area; the temperature parameters comprise average temperature of a piston, average temperature of a cylinder cover and average temperature of a cylinder sleeve;
wherein, the ignition oil injection quantity determining module is used for:
determining a minimum injection amount of pilot oil based on the target heat, the total heat dissipation of the cylinder, and the pilot total oil heating value;
Determining a correction coefficient through a pilot oil injection quantity correction relation table based on the current engine speed and the cooling water temperature; the pilot oil injection quantity correction relation table is used for describing the relation between the current engine speed and the cooling water temperature and the correction coefficient;
And taking the product of the minimum injection quantity of the pilot oil and the correction coefficient as the injection quantity of the pilot oil.
6. An electronic device, the electronic device comprising:
at least one processor; and
A memory communicatively coupled to the at least one processor; wherein,
The memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the thermodynamic-based dual fuel injection quantity control method of any one of claims 1-4.
7. A computer readable storage medium storing computer instructions for causing a processor to execute the thermodynamic-based dual fuel injection quantity control method of any one of claims 1-4.
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