CN108869063B - A control method and device for a dual-fuel engine - Google Patents
A control method and device for a dual-fuel engine Download PDFInfo
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- CN108869063B CN108869063B CN201810523188.6A CN201810523188A CN108869063B CN 108869063 B CN108869063 B CN 108869063B CN 201810523188 A CN201810523188 A CN 201810523188A CN 108869063 B CN108869063 B CN 108869063B
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- 239000000446 fuel Substances 0.000 title claims abstract description 211
- 238000000034 method Methods 0.000 title claims abstract description 50
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 483
- 239000002283 diesel fuel Substances 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 230000008569 process Effects 0.000 claims abstract description 26
- 230000009977 dual effect Effects 0.000 claims abstract description 11
- 230000007613 environmental effect Effects 0.000 claims abstract description 10
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims 7
- 230000001105 regulatory effect Effects 0.000 claims 2
- 238000002485 combustion reaction Methods 0.000 abstract description 9
- 230000003749 cleanliness Effects 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000001404 mediated effect Effects 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- -1 that is Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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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
- F02D19/081—Adjusting the fuel composition or mixing ratio; Transitioning from one fuel to the other
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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
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
本发明实施例公开了一种双燃料发动机的控制方法和装置，该控制方法包括：获取发动机水温、环境温度和中冷后温度；如果检测到中冷后温度大于甲醇闪点，以及发动机水温和/或环境温度大于甲醇闪点，控制双燃料发动机按照柴油甲醇双燃料模式进行启动。本发明实施例，柴油+甲醇作为双燃料介入发动机启动过程，甲醇具有高清洁、环保和价格低的优势，能够降低纯柴油燃料模式下发动机启动过程中的燃料费用，并能够改善发动机排放差的问题；启动成功率高，解决了纯甲醇燃料模式启动困难的问题；双燃料发动机进入运行阶段后具有燃烧稳定性好、发动机噪音低的优势，避免了纯柴油燃料模式切换为其他燃料模式时的燃烧稳定性差和发动机噪音大的问题。
The embodiment of the present invention discloses a control method and device for a dual-fuel engine. The control method includes: acquiring engine water temperature, ambient temperature and temperature after intercooling; if it is detected that the temperature after intercooling is greater than the flash point of methanol, and the /or the ambient temperature is greater than the flash point of methanol, and the dual-fuel engine is controlled to start in the diesel-methanol dual-fuel mode. In the embodiment of the present invention, diesel + methanol is used as a dual fuel to intervene in the engine starting process. Methanol has the advantages of high cleanliness, environmental protection and low price, which can reduce the fuel cost during the starting process of the engine in the pure diesel fuel mode, and can improve the poor emission of the engine. problem; high startup success rate, which solves the problem of difficult startup in pure methanol fuel mode; dual-fuel engine has the advantages of good combustion stability and low engine noise after entering the operating stage, avoiding the problem of switching from pure diesel fuel mode to other fuel modes. Problems with poor combustion stability and loud engine noise.
Description
Technical Field
The embodiment of the invention relates to the engine technology, in particular to a control method and a control device for a dual-fuel engine.
Background
With the continuous improvement of energy conservation and emission reduction requirements, the improvement of the efficiency of the engine and the reduction of emission become the main research direction of the current automobile industry. At present, the main fuel in the automobile industry comprises diesel oil, and under the background that the problems of energy and environmental pollution are increasingly prominent, methanol also becomes the most potential alternative fuel in the automobile industry based on the characteristics of high cleanness and environmental protection. The methanol has the advantages of rich sources, high productivity, low price, convenient storage and transportation and the like, and the physicochemical characteristics of high octane number, low cetane number and the like ensure that the methanol is mainly used for ignition engines and can also be used for diesel and methanol dual-fuel mode compression ignition engines.
In the prior art, a diesel and methanol dual-fuel mode engine is started by using pure diesel as fuel at a starting stage, and is switched to a diesel and methanol dual-fuel mode or a pure methanol fuel mode to operate after the engine operates for a period of time and the temperature reaches a certain requirement. However, the diesel and methanol dual-fuel mode engine is started by using pure diesel as fuel in the starting stage, and has the problems of high fuel cost and poor engine emission.
Disclosure of Invention
The embodiment of the invention provides a control method and a control device of a dual-fuel engine, which aim to solve the problems of high fuel cost and poor engine emission in the starting stage of the existing diesel and methanol dual-fuel mode engine.
The embodiment of the invention provides a control method of a dual-fuel engine, which comprises the following steps:
acquiring the water temperature of an engine, the ambient temperature and the intercooled temperature;
and if the temperature after the inter-cooling is detected to be higher than the methanol flash point, and the water temperature and/or the environment temperature of the engine are/is higher than the methanol flash point, controlling the dual-fuel engine to start according to a diesel and methanol dual-fuel mode.
Further, the methanol flash point was 10 ℃.
Further, the control method further includes: and if the temperature after the inter-cooling is detected to be less than or equal to the methanol flash point, and/or the ambient temperature and the engine water temperature are both less than or equal to the methanol flash point, controlling the dual-fuel engine to start according to a pure diesel fuel mode.
Further, after controlling the dual-fuel engine to start according to the diesel-methanol dual-fuel mode, the method further includes: and determining a target temperature interval to which the environment temperature belongs, determining a dual-fuel ratio corresponding to the target temperature interval as a target dual-fuel ratio, and controlling the injection ratio of the diesel and the methanol according to the target dual-fuel ratio.
Further, the control method further includes: and if the dual-fuel engine fails to be started according to the diesel and methanol dual-fuel mode, controlling the dual-fuel engine to be started according to a pure diesel fuel mode.
The embodiment of the invention also provides a control device of the dual-fuel engine, which comprises the following components:
the engine temperature acquisition module is used for acquiring the water temperature of the engine, the ambient temperature and the temperature after intercooling;
and the fuel mode adjusting module is used for controlling the dual-fuel engine to start according to a diesel and methanol dual-fuel mode if the temperature after inter-cooling is detected to be greater than the methanol flash point and the water temperature of the engine and/or the environment temperature are/is greater than the methanol flash point.
Further, the methanol flash point was 10 ℃.
Further, the fuel mode adjusting module is further configured to control the dual-fuel engine to start according to a pure diesel fuel mode if the post-intercooling temperature is detected to be less than or equal to the methanol flash point, and/or the ambient temperature and the engine water temperature are both less than or equal to the methanol flash point.
Further, the control device further includes: and the fuel proportion control module is used for determining a target temperature interval to which the ambient temperature belongs after the dual-fuel engine is started according to a diesel and methanol dual-fuel mode, determining a dual-fuel proportion corresponding to the target temperature interval as a target dual-fuel proportion, and controlling the injection proportion of diesel and methanol according to the target dual-fuel proportion.
Further, the fuel regulation mode module is also used for controlling the dual-fuel engine to start according to a pure diesel fuel mode if the dual-fuel engine fails to start according to the diesel methanol dual-fuel mode.
According to the control method and the control device for the dual-fuel engine, provided by the embodiment of the invention, when the water temperature and/or the environment temperature of the engine are detected to be higher than the methanol flash point and the temperature after intercooling is higher than the methanol flash point, the dual-fuel engine is controlled to be started according to a diesel and methanol dual-fuel mode. In the embodiment of the invention, when the temperature exceeds the methanol flash point, a methanol-mediated diesel oil and methanol dual-fuel mode is adopted to intervene in the starting process of the engine, the methanol has the advantages of high cleanness, environmental protection and low price, the fuel cost in the starting process of the engine in a pure diesel fuel mode can be reduced, and the problem of poor emission of the engine can be solved; in the embodiment of the invention, diesel oil and methanol are used as dual fuel to intervene in the starting process of the engine, the temperature exceeds the flash point of the methanol at the moment, the starting success rate is high, and the problem of difficult starting caused by a pure methanol fuel mode can be solved. In the embodiment of the invention, the dual-fuel engine can operate according to a dual-fuel mode of diesel oil and methanol or a pure methanol fuel mode after the operation stage, has the advantages of good combustion stability and low engine noise, and avoids the problems of poor combustion stability and high engine noise when the pure diesel fuel mode is switched to other fuel modes in the prior art.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method of controlling a dual fuel engine provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of a control apparatus for a dual fuel engine according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a fuel injection system of a dual fuel engine provided by an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a flowchart of a control method of a dual-fuel engine according to an embodiment of the present invention is provided, and the method may be performed by a control device of the dual-fuel engine, which may be implemented in software and/or hardware and configured to be executed in an electronic control unit of a vehicle.
The control method of the dual-fuel engine provided by the embodiment specifically comprises the following steps:
and step 110, acquiring the water temperature of the engine, the ambient temperature and the intercooled temperature.
In this embodiment, the control device determines the fuel mode at the engine start stage by collecting the engine water temperature, the ambient temperature, and the post-intercooling temperature. Specifically, a water temperature sensor, an ambient temperature sensor and an after-intercooling temperature sensor are installed in the dual-fuel engine, the water temperature sensor is used for collecting water temperature of the engine, the ambient temperature sensor is used for collecting ambient temperature of the engine, the after-intercooling temperature sensor is used for collecting after-intercooling temperature, namely exhaust temperature of the engine, and a control device integrated in the electronic control unit is electrically connected with the water temperature sensor, the ambient temperature sensor and the after-intercooling temperature sensor respectively to obtain water temperature, ambient temperature and after-intercooling temperature of the engine. The control device integrated in the electronic control unit determines the environmental state of the engine by judging the water temperature of the engine, the ambient temperature and the after-cold temperature so as to realize the fuel modes under different temperature conditions.
And step 120, if the temperature after the inter-cooling is detected to be higher than the methanol flash point and the water temperature and/or the environment temperature of the engine are/is higher than the methanol flash point, controlling the dual-fuel engine to start according to the diesel and methanol dual-fuel mode.
In this embodiment, if it is detected that both the water temperature and the after-intercooling temperature of the engine are greater than the methanol flash point, it is indicated that the current temperature state of the engine is relatively high, and methanol can be combusted in the engine temperature state, and the corresponding methanol can be introduced into the starting process of the engine as a fuel. If the detected ambient temperature and the inter-cooled temperature are both greater than the methanol flash point, the temperature state of the current engine is higher, the ambient temperature of the engine is relatively higher, the methanol can be combusted in the temperature state of the engine or the ambient temperature of the engine, and the corresponding methanol can be used as fuel to intervene in the starting process of the engine. If the detected water temperature, the ambient temperature and the intercooled temperature of the engine are all greater than the methanol flash point, the current temperature state of the engine is higher, the ambient temperature of the engine is relatively higher, the methanol can be combusted in the temperature state of the engine or the ambient temperature of the engine, and the corresponding methanol can be used as fuel to intervene in the starting process of the engine. Based on this, the control device controls the dual-fuel engine to start according to the diesel and methanol dual-fuel mode, namely the dual-fuel engine is started in a diesel and methanol mode in the starting process. In the embodiment, when the temperature state of the engine or the environment temperature state of the engine exceeds the methanol flash point, the diesel and methanol dual-fuel mode can be adopted to intervene in the starting process of the engine, so that the dual-fuel mode starting in the low-temperature state (exceeding the methanol flash point) is realized. Compared with a pure diesel fuel mode, the diesel and methanol dual-fuel mode can reduce fuel cost and emission, save energy and cost and reduce environmental pollution.
The optional methanol flash point is 10 ℃, and those skilled in the art will understand that the methanol flash point selected to be 10 ℃ in this embodiment is a methanol flash point that is determined by experimental verification and can allow methanol to be successfully involved in the engine start-up process and be burned as fuel, that is, methanol can be burned at a temperature higher than the methanol flash point, and in other embodiments, relevant practitioners can reasonably determine the methanol flash point according to different vehicles or environments.
According to the control method of the dual-fuel engine provided by the embodiment, when the water temperature/environment temperature of the engine is detected to be higher than the methanol flash point and the temperature after intercooling is higher than the methanol flash point, the dual-fuel engine is controlled to be started according to a diesel and methanol dual-fuel mode. In the embodiment, when the temperature of the engine or the environment temperature of the engine exceeds the methanol flash point, a methanol-mediated diesel oil and methanol dual-fuel mode is adopted to intervene in the starting process of the engine, the methanol has the advantages of high cleanness, environmental protection and low price, the fuel cost in the starting process of the engine in a pure diesel oil fuel mode can be reduced, and the problem of poor emission of the engine can be solved; in the embodiment, the diesel oil and the methanol are used as dual fuels to intervene in the starting process of the engine, the temperature of the engine or the temperature of the environment where the engine is located exceeds the flash point of the methanol, the starting success rate is high, and the problem of difficult starting caused by a pure methanol fuel mode can be solved. In the embodiment, the dual-fuel engine can operate in a dual-fuel mode of diesel and methanol or a pure methanol fuel mode after the operation phase, so that the dual-fuel engine has the advantages of good combustion stability and low engine noise, and the problems of poor combustion stability and high engine noise when the pure diesel fuel mode is switched to other fuel modes in the prior art are solved.
Illustratively, on the basis of the above technical solution, the control method may further include: and if the temperature is less than or equal to the methanol flash point after the intercooling is detected, and/or the ambient temperature and the engine water temperature are both less than or equal to the methanol flash point, controlling the dual-fuel engine to start according to a pure diesel fuel mode. After intercooling, the temperature is less than or equal to the methanol flash point, which indicates that the temperature of the engine is low, methanol cannot be effectively combusted in the temperature state of the engine, if methanol is used as fuel to intervene in the starting process of the engine, the engine can be failed to start, and based on the condition, the dual-fuel engine is controlled to start according to a pure diesel fuel mode. The environment temperature and the engine water temperature are both less than or equal to the methanol flash point, which indicates that the temperature of the engine is low or the environment temperature of the engine is low, methanol cannot be effectively combusted in the engine temperature state, if methanol is used as fuel to intervene in the starting process of the engine, the engine may fail to start, and based on the situation, the dual-fuel engine is controlled to start according to a pure diesel fuel mode. Under the low temperature condition lower than the methanol flash point, the engine is started in a pure diesel mode, so that the successful starting of the dual-fuel engine under the low temperature condition lower than the methanol flash point is realized.
Illustratively, on the basis of the above technical solution, the control method may further include: and if the dual-fuel engine fails to start according to the diesel and methanol dual-fuel mode, controlling the dual-fuel engine to start according to the pure diesel fuel mode. When the dual-fuel engine is started according to the diesel and methanol dual-fuel mode, the possibility of failed start exists, so that if the start fails, the control device can control the dual-fuel engine to start according to the pure diesel fuel mode, and therefore the successful start of the engine can be realized.
Exemplarily, on the basis of the above technical solution, after the dual-fuel engine is selectively controlled to start in the diesel-methanol dual-fuel mode, the method further includes: determining a target temperature interval to which the environment temperature belongs, determining a dual-fuel ratio corresponding to the target temperature interval as a target dual-fuel ratio, and controlling the injection ratio of the diesel and the methanol according to the target dual-fuel ratio. Under different environmental temperature conditions, the combustion efficiency of the methanol is different, and on the basis, the control device can store a plurality of temperature intervals in advance, each temperature interval corresponds to one injection ratio of the diesel oil and the methanol, namely, under different environmental temperature conditions, the dual-fuel engine adopts different ratios of the methanol and the diesel oil in a diesel oil and methanol dual-fuel mode at a starting stage, particularly, the higher the temperature is, the higher the methanol ratio is, so that the methanol fuel can be used to the maximum extent, the fuel cost is saved, and the engine emission is reduced. Specifically, when the target temperature interval to which the ambient temperature belongs is determined, the dual-fuel ratio corresponding to the target temperature interval can be determined as the target dual-fuel ratio of the dual-fuel engine, and the injection ratio of diesel and methanol is controlled according to the target dual-fuel ratio.
It will be understood by those skilled in the art that the relevant practitioner can reasonably determine different temperature conditions and injection ratios of methanol and diesel oil at each ambient temperature condition, and the higher the temperature, the higher the methanol ratio, thereby maximizing the use of methanol fuel, saving fuel cost and reducing engine emissions.
Referring to fig. 2, a schematic diagram of a control device for a dual-fuel engine according to an embodiment of the present invention is provided, the control device can execute the control method for the dual-fuel engine according to any embodiment of the present invention, and the control device can be implemented in software and/or hardware and configured to be executed in an electronic control unit of a vehicle.
The control device of the dual-fuel engine provided by the embodiment comprises: the obtain engine temperature module 210 and the adjust fuel mode module 220.
The engine temperature obtaining module 210 is configured to obtain an engine water temperature, an ambient temperature, and an intercooled temperature; the adjust fuel mode module 220 is configured to control the dual-fuel engine to start according to the diesel and methanol dual-fuel mode if the post-intercooled temperature is detected to be greater than the methanol flash point and the engine water temperature and/or the ambient temperature is detected to be greater than the methanol flash point.
Alternatively, the methanol flash point is 10 ℃.
Optionally, the adjusting fuel mode module 220 is further configured to control the dual-fuel engine to start according to the pure diesel fuel mode if the detected after-intercooled temperature is less than or equal to the methanol flash point, and/or both the ambient temperature and the engine water temperature are less than or equal to the methanol flash point.
Optionally, the control device further includes: and the fuel proportion control module is used for determining a target temperature interval to which the ambient temperature belongs after the dual-fuel engine is started according to the diesel and methanol dual-fuel mode, determining the dual-fuel proportion corresponding to the target temperature interval as the target dual-fuel proportion, and controlling the injection proportion of the diesel and the methanol according to the target dual-fuel proportion.
Optionally, the adjust fuel mode module 220 is further configured to control the dual-fuel engine to start in the pure diesel fuel mode if the dual-fuel engine fails to start in the diesel methanol dual-fuel mode.
The control device for the dual-fuel engine provided by the embodiment controls the dual-fuel engine to start according to a diesel and methanol dual-fuel mode when the water temperature and/or the environment temperature of the engine are detected to be higher than a methanol flash point and the temperature after inter-cooling is higher than the methanol flash point. In the embodiment, when the temperature exceeds the methanol flash point, a methanol-mediated diesel oil and methanol dual-fuel mode is adopted to intervene in the starting process of the engine, the methanol has the advantages of high cleanness, environmental protection and low price, the fuel cost in the starting process of the engine in a pure diesel fuel mode can be reduced, and the problem of poor emission of the engine can be solved; in the embodiment, the diesel oil and the methanol are used as dual fuels to intervene in the starting process of the engine, the temperature exceeds the methanol flash point at the moment, the starting success rate is high, and the problem of difficult starting caused by a pure methanol fuel mode can be solved. In the embodiment, the dual-fuel engine can operate in a dual-fuel mode of diesel and methanol or a pure methanol fuel mode after the operation phase, so that the dual-fuel engine has the advantages of good combustion stability and low engine noise, and the problems of poor combustion stability and high engine noise when the pure diesel fuel mode is switched to other fuel modes in the prior art are solved.
Referring to fig. 3, a fuel injection system of a dual-fuel engine is provided for an embodiment of the present invention, the fuel injection system includes the dual-fuel engine as described in any of the above embodiments and a control device, and the control device is integrated in an electronic control unit ECU.
In this embodiment, the dual fuel engine has an intake conduit, an exhaust conduit, and a diesel injection conduit for directly injecting diesel into the engine cylinder when the diesel is involved in the engine starting process or running process as fuel. The air inlet pipeline of the dual-fuel engine is also connected with a methanol injection device, and the methanol injection device is used for injecting methanol into the air inlet pipeline when the methanol is used as fuel to intervene in the starting process or the running process of the engine so as to enable the methanol fuel to enter the engine cylinder through the air inlet pipeline.
In this embodiment, the dual-fuel engine is electrically connected to an electronic control unit, in which a control device is integrated, and the control device is used to control the fuel mode of the dual-fuel engine in the start phase. Specifically, the control device is also electrically connected with the ambient temperature sensor, the water temperature sensor and the post-intercooling temperature sensor respectively, and is used for acquiring the ambient temperature, the engine water temperature and the post-intercooling temperature, determining the fuel mode of the dual-fuel engine in the starting stage according to the relationship between the ambient temperature, the engine water temperature and the post-intercooling temperature, and controlling the dual-fuel engine to start according to the determined fuel mode.
The injection system of the dual-fuel engine provided by the embodiment can be started in the dual-fuel mode of diesel oil and methanol under the low-temperature or high-temperature condition exceeding the methanol flash point under the control of the control device, and can also be started in the fuel mode of pure diesel oil under the low-temperature condition lower than the methanol flash point under the control of the control device.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (6)
1. A control method of a dual fuel engine, characterized by comprising:
acquiring the water temperature of an engine, the ambient temperature and the intercooled temperature;
if the temperature after intercooling is detected to be higher than the methanol flash point, and the water temperature and/or the environmental temperature of the engine are/is detected to be higher than the methanol flash point, controlling the dual-fuel engine to start according to a diesel and methanol dual-fuel mode, wherein the starting of the dual-fuel engine means that the dual-fuel engine is started in a diesel and methanol mode in the starting process, the methanol flash point is 10 ℃, and the methanol flash point is used for enabling methanol to successfully intervene in the starting process of the engine and be burnt as fuel when the methanol is higher than the methanol flash point;
after controlling the dual-fuel engine to start according to the diesel and methanol dual-fuel mode, the method further comprises the following steps: and determining a target temperature interval to which the environment temperature belongs, determining a dual-fuel ratio corresponding to the target temperature interval as a target dual-fuel ratio, and controlling the injection ratio of the diesel and the methanol according to the target dual-fuel ratio.
2. The control method according to claim 1, characterized by further comprising: and if the temperature after the inter-cooling is detected to be less than or equal to the methanol flash point, and/or the ambient temperature and the engine water temperature are both less than or equal to the methanol flash point, controlling the dual-fuel engine to start according to a pure diesel fuel mode.
3. The control method according to any one of claims 1-2, characterized by further comprising: and if the dual-fuel engine fails to be started according to the diesel and methanol dual-fuel mode, controlling the dual-fuel engine to be started according to a pure diesel fuel mode.
4. A control apparatus for a dual fuel engine, comprising:
the engine temperature acquisition module is used for acquiring the water temperature of the engine, the ambient temperature and the temperature after intercooling;
the fuel mode adjusting module is used for controlling the dual-fuel engine to be started according to a diesel and methanol dual-fuel mode if the temperature after inter-cooling is detected to be greater than a methanol flash point and the water temperature and/or the environmental temperature of the engine are/is greater than the methanol flash point, wherein the starting of the dual-fuel engine means that the dual-fuel engine is started in a diesel and methanol dual-fuel mode, the methanol flash point is 10 ℃, and the methanol flash point is used for enabling methanol to successfully intervene in the starting process of the engine and be burnt as fuel when the methanol is higher than the methanol flash point;
and the fuel proportion control module is used for determining a target temperature interval to which the ambient temperature belongs after the dual-fuel engine is started according to a diesel and methanol dual-fuel mode, determining a dual-fuel proportion corresponding to the target temperature interval as a target dual-fuel proportion, and controlling the injection proportion of diesel and methanol according to the target dual-fuel proportion.
5. The control apparatus of claim 4, wherein the regulated fuel mode module is further configured to control the dual fuel engine to start in a pure diesel fuel mode if the post-intercooled temperature is detected to be less than or equal to the methanol flash point, and/or the ambient temperature and the engine water temperature are both less than or equal to the methanol flash point.
6. The control apparatus of any of claims 4-5, wherein the regulated fuel mode module is further configured to control the dual-fuel engine to start in a pure diesel fuel mode if the dual-fuel engine fails to start in the diesel methanol dual-fuel mode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810523188.6A CN108869063B (en) | 2018-05-28 | 2018-05-28 | A control method and device for a dual-fuel engine |
Applications Claiming Priority (1)
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| CN111720220B (en) * | 2020-06-29 | 2022-03-25 | 浙江吉利新能源商用车集团有限公司 | Control method and system of engine dual-fuel supply system |
| CN114718742A (en) * | 2022-03-23 | 2022-07-08 | 潍柴动力股份有限公司 | Control method, device and equipment of dual-fuel engine and computer storage medium |
| CN114718776A (en) * | 2022-03-23 | 2022-07-08 | 潍柴动力股份有限公司 | Dual-fuel engine control method and device, electronic equipment and storage medium |
| CN114856794B (en) * | 2022-05-30 | 2023-08-18 | 淄柴机器有限公司 | Water temperature control method for marine diesel methanol dual-fuel engine |
| CN115217642B (en) * | 2022-06-30 | 2024-05-17 | 潍柴动力股份有限公司 | Control method and control device for dual-fuel engine |
| CN116255254A (en) * | 2023-03-09 | 2023-06-13 | 玉柴联合动力股份有限公司 | A diesel+methanol dual fuel engine and its control system |
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| CN101086235A (en) * | 2007-06-06 | 2007-12-12 | 奇瑞汽车有限公司 | Methanol fuel engine low temperature start-up device and its control method |
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| CN101655037B (en) * | 2009-05-12 | 2011-05-04 | 上海华普汽车有限公司 | Control method of methyl alcohol flexible fuel vehicle and system thereof |
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| CN106704012B (en) * | 2017-01-10 | 2019-07-09 | 长安大学 | Methanol-Diesel Dual-Fuel Engine control system and method |
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| CN101086235A (en) * | 2007-06-06 | 2007-12-12 | 奇瑞汽车有限公司 | Methanol fuel engine low temperature start-up device and its control method |
| CN106150709A (en) * | 2015-03-27 | 2016-11-23 | 长城汽车股份有限公司 | The idle speed control of dual fuel engine, system and vehicle |
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