CN112523879A - Dual-fuel control method and system for vehicle and vehicle - Google Patents
Dual-fuel control method and system for vehicle and vehicle Download PDFInfo
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- CN112523879A CN112523879A CN202011355857.7A CN202011355857A CN112523879A CN 112523879 A CN112523879 A CN 112523879A CN 202011355857 A CN202011355857 A CN 202011355857A CN 112523879 A CN112523879 A CN 112523879A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 333
- 239000003502 gasoline Substances 0.000 claims description 103
- 238000002347 injection Methods 0.000 claims description 62
- 239000007924 injection Substances 0.000 claims description 62
- 230000009977 dual effect Effects 0.000 claims description 29
- 230000008569 process Effects 0.000 claims description 10
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- 239000003054 catalyst Substances 0.000 claims description 8
- 238000002485 combustion reaction Methods 0.000 description 14
- 239000007788 liquid Substances 0.000 description 12
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 6
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- 238000012545 processing Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000010763 heavy fuel oil Substances 0.000 description 2
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- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
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- 239000002341 toxic gas Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
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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
- F02D19/0623—Failure diagnosis or prevention; Safety measures; Testing
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- 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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
-
- 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
- Y02T10/40—Engine management systems
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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)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention provides a dual-fuel control method and system for a vehicle and the vehicle, and relates to the field of vehicle engines. According to the method, the fault information of the vehicle for indicating whether the dual-fuel system has the fault and the operation parameter information of the engine system are firstly acquired, then one fuel system in the dual-fuel system is controlled to supply power to the engine according to the fault information and the operation parameter information, and the dual-fuel system is controlled to be switched with each other, so that the engine can normally operate. The invention not only considers the running parameter information of the engine system, but also considers the fault information of the dual-fuel system, so the invention is more comprehensively considered and can ensure the stable running of the engine.
Description
Technical Field
The invention relates to the field of vehicle engines, in particular to a dual-fuel control method and system for a vehicle and the vehicle.
Background
The heat value of the methanol is 45 percent of that of the gasoline, the theoretical air-fuel ratio is about 44 percent, the octane number is higher than that of the gasoline and the ethanol, and the antiknock property is good, so the methanol can reduce the temperature of a combustion chamber, improve the charge coefficient of an engine and reduce NOxAnd (5) discharging. However, the latent heat of vaporization of methanol is 3.57 times that of gasoline, the volatility of methanol is inferior to that of gasoline, the atomization effect is poor, the methanol is extremely toxic, and harmful substances such as methanol, formaldehyde and the like are easily generated due to insufficient combustion. Methanol automobiles usually use gasoline and methanol as fuels for advantage complementation, and in order to fully exert the economic advantage of methanol and avoid some disadvantages objectively existing in the methanol automobiles, the operation states of the automobiles and engines need to be combined for comprehensive judgment, so that the optimal fuel is selected for combustion.
The existing fuel switching scheme of the methanol dual-fuel automobile mainly has the following three scenes: a driver triggers switching, starting and cold machine stages to use gasoline through a key according to subjective wishes to ensure starting and combustion reliability, an ECU receives a fuel residual liquid level signal and switches to another fuel in time when the fuel residual liquid level signal is too low, and the switching mode is far from meeting strict emission regulations and increasing consumption upgrading of users in consideration of the characteristics of specificity, severe toxicity, harmful gas release due to incomplete combustion and the like of methanol fuel. Moreover, the dual-fuel switching strategy in the prior art is too simple, the failure mode, emission, drivability and other aspects of core parts are not comprehensively considered, the problem that the engine cannot normally operate is caused, a large amount of complaints of after-sales users can be caused, and even the risk of regulations is met.
Disclosure of Invention
The invention aims to provide a dual-fuel control method for a vehicle, which solves the technical problem that an engine cannot normally run due to incomplete consideration and too simple switching strategy of a dual-fuel control system in the prior art.
It is a further object of the first aspect of the invention to provide stable operation of the engine and avoid poor emissions.
It is an object of a second aspect of the present invention to provide a dual fuel control system for a vehicle.
It is an object of a third aspect of the invention to provide a vehicle having a dual fuel control system as described above.
According to an object of a first aspect of the invention, there is provided a dual fuel control method for a vehicle, comprising:
acquiring fault information of a vehicle for indicating whether a dual-fuel system is in fault and operating parameter information of an engine system;
and controlling one fuel system in the dual-fuel systems to supply power to the engine according to the fault information and the operation parameter information, and controlling the dual-fuel systems to be switched with each other so as to enable the engine to operate normally.
Optionally, the dual fuel system is a methanol fuel system and a gasoline fuel system.
Optionally, when the gasoline fuel system is in failure, controlling a display unit to remind a user of the failure of the gasoline fuel system;
when the methanol fuel system fails and the gasoline fuel system does not fail, the control is switched to the gasoline fuel system to supply energy to the engine, and the display unit is controlled to remind a user of the failure of the methanol fuel system.
Optionally, the step of controlling the mutual switching between the dual-fuel systems specifically includes:
in the process of switching the gasoline fuel system to the methanol fuel system, the fuel injection quantity of the gasoline fuel is gradually reduced, the fuel injection quantity of the methanol fuel is gradually increased, and the fuel injection ratio of the methanol fuel is directly increased to a first preset threshold value; when the fuel injection quantity of the gasoline fuel is reduced to a second preset threshold value, controlling to directly reduce the fuel injection ratio of the gasoline fuel to 0%;
wherein the fuel injection ratio is any value in the range of 0-100%, and the sum of the fuel injection ratio of the methanol fuel and the fuel injection ratio of the gasoline fuel is 100%.
Optionally, the step of controlling the switching between the dual-fuel systems further includes:
in the process of switching the methanol fuel system to the gasoline fuel system, the fuel injection quantity of the methanol fuel is gradually reduced, the fuel injection quantity of the gasoline fuel is gradually increased, and the fuel injection ratio of the gasoline fuel is directly increased to a third preset threshold value; when the fuel injection quantity of the methanol fuel is reduced to a fourth preset threshold value, the fuel injection ratio of the methanol fuel is directly reduced to 0% by control.
Optionally, the operating parameter information includes an exhaust gas temperature;
the gasoline fuel system does the engine energy supply, just the exhaust temperature of engine surpasss and predetermines exhaust temperature and last control switch to behind the first preset time the methanol fuel system does the engine energy supply.
Optionally, the operating parameter information includes a temperature of a catalyst in the engine system;
and controlling the gasoline fuel system to supply energy to the engine when the temperature of the catalyst exceeds a preset temperature threshold value.
Alternatively, when the vehicle is started for the first use, the gasoline fuel system is controlled to solely supply energy to the engine, then the gasoline fuel system and the methanol fuel system are controlled to simultaneously supply energy to the engine according to the preset proportion after the second preset time, and then the methanol fuel system is controlled to solely supply energy to the engine after the third preset time so as to discharge gas in the gasoline fuel system and the methanol fuel system.
According to the object of the second aspect of the invention, the invention also provides a dual fuel control system for a vehicle, comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring fault information of a vehicle for indicating whether a dual-fuel system has a fault and operation parameter information of an engine; and
the control module comprises a memory and a processor, wherein the memory stores a calculation program, and the calculation program is used for realizing the control method when being executed by the processor.
According to the object of the third aspect of the invention, the invention also provides a vehicle with the dual-fuel control system.
According to the method, the fault information of the vehicle for indicating whether the dual-fuel system has the fault and the operation parameter information of the engine system are firstly acquired, then one fuel system in the dual-fuel system is controlled to supply power to the engine according to the fault information and the operation parameter information, and the dual-fuel system is controlled to be switched with each other, so that the engine can normally operate. The invention not only considers the running parameter information of the engine system, but also considers the fault information of the dual-fuel system, so the invention is more comprehensively considered and can ensure the stable running of the engine.
Further, in the process of switching the gasoline fuel system to the methanol fuel system, the fuel injection quantity of the gasoline fuel is gradually reduced, the fuel injection quantity of the methanol fuel is gradually increased, and the fuel injection ratio of the methanol fuel is directly increased to the first preset threshold value. When the fuel injection quantity of the gasoline fuel is reduced to a second preset threshold value, the fuel injection ratio of the gasoline fuel is directly reduced to 0% by control. Wherein the fuel injection ratio is any value in the range of 0-100%, and the sum of the fuel injection ratio of the methanol fuel and the fuel injection ratio of the gasoline fuel is 100%. When the injection pulse width of the methanol fuel or the injection pulse width of the gasoline fuel is in a nonlinear region, accurate calculation of the injection quantity cannot be ensured, and situations of combustion deterioration, vehicle shaking and emission deterioration may occur.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic flow chart diagram of a dual fuel control method according to one embodiment of the present invention;
FIG. 2 is a schematic flow chart diagram of a dual fuel control method according to another embodiment of the present invention;
FIG. 3 is a schematic block diagram of a dual fuel control system according to one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
FIG. 1 is a schematic flow chart diagram of a dual fuel control method according to one embodiment of the present invention. As shown in FIG. 1, in one particular embodiment, the dual fuel control method may generally include the steps of:
s100, acquiring fault information of a vehicle for indicating whether a dual-fuel system has a fault and operation parameter information of an engine system;
and S200, controlling one fuel system in the dual-fuel systems to supply power to the engine according to the fault information and the operation parameter information, and controlling the dual-fuel systems to be switched with each other, so that the engine can normally operate.
The invention not only considers the running parameter information of the engine system, but also considers the fault information of the dual-fuel system, so the invention is more comprehensively considered and can ensure the stable running of the engine. Also, the present invention cancels the function that the driver can trigger fuel switching by pressing a button at any time according to subjective will, because personal preference cannot guarantee economy and emissions, and may cause unknown problems and unnecessary after-market complaints of the vehicle.
FIG. 2 is a schematic flow chart diagram of a dual fuel control method according to another embodiment of the invention. As shown in fig. 2, and referring to fig. 1, in another embodiment, the dual fuel system is a methanol fuel system and a gasoline fuel system. In other embodiments, other fuel systems may be selected to power the engine.
Specifically, step S200 may include the following cases:
s210, when the gasoline fuel system fails, the control display unit reminds a user of the failure of the gasoline fuel system.
S220, when the methanol fuel system fails and the gasoline fuel system does not fail, the control is switched to the gasoline fuel system to supply power to the engine, and the display unit is controlled to remind a user of the failure of the methanol fuel system.
Here, step S210 and step S220 are not in sequence, and the display unit may be a dashboard.
Further, the failure of the gasoline fuel system specifically refers to the failure of core components such as a gasoline pump, a gasoline injector and a gasoline pump relay in the gasoline fuel system, and when the core components fail, the core components cannot be switched to the methanol fuel system to supply power to the engine, so as to avoid vehicle abnormality caused when the methanol fuel system is switched back to the gasoline fuel system in some scenes. In addition, gasoline fuel is used as a starting fuel and an auxiliary fuel, and when the core components of the gasoline fuel fail, the vehicle will obviously fail, and the gasoline fuel must go to a 4S shop to be inspected and maintained as soon as possible.
The methanol fuel system is in fault, and particularly refers to the faults of core parts such as a methanol pump, a methanol injector and a methanol pump relay in the methanol fuel system, when the core parts of the methanol fuel system are in fault and the core parts of the gasoline fuel system are not in fault, the core parts are switched to the gasoline fuel system to supply energy to an engine, so that the condition that the vehicle is frequently flameout due to the fact that the methanol cannot be normally supplied and mistakenly switched under the methanol fault mode is avoided, and unnecessary after-sale complaints cannot be brought to a 4S shop smoothly.
Further, step S200 may also include the following cases, that is, the step of controlling the mutual switching between the dual fuel systems, which may include the following cases:
the first method comprises the following steps: in the process of switching the gasoline fuel system to the methanol fuel system, the fuel injection quantity of the gasoline fuel is gradually reduced, the fuel injection quantity of the methanol fuel is gradually increased, and the fuel injection ratio of the methanol fuel is directly increased to a first preset threshold value; when the fuel injection quantity of the gasoline fuel is reduced to a second preset threshold value, the fuel injection ratio of the gasoline fuel is directly reduced to 0% by control. Wherein the fuel injection ratio is any value in the range of 0-100%, and the sum of the fuel injection ratio of the methanol fuel and the fuel injection ratio of the gasoline fuel is 100%. Here, the first preset threshold and the second preset threshold may be set to the same value. In one embodiment, the first preset threshold and the second preset threshold may be set to 30%.
And the second method comprises the following steps: in the process of switching the methanol fuel system to the gasoline fuel system, the fuel injection quantity of the methanol fuel is gradually reduced, the fuel injection quantity of the gasoline fuel is gradually increased, and the fuel injection ratio of the gasoline fuel is directly increased to a third preset threshold value; when the fuel injection quantity of the methanol fuel is reduced to a fourth preset threshold value, the fuel injection ratio of the methanol fuel is directly reduced to 0 percent by control. Here, the third preset threshold and the fourth preset threshold may be set to the same value and the same as the first preset threshold and the second preset threshold. In one embodiment, the third preset threshold and the fourth preset threshold may be set to 30%. In another embodiment, the first preset threshold, the second preset threshold, the third preset threshold and the fourth preset threshold may also be specifically set according to the actual requirements of the vehicle.
Here, steps S210 and S220, the first case, and the second case are not in sequence.
Specifically, the switching between the dual fuel systems is usually completed in a very short time, when the gasoline fuel system is switched to the methanol fuel system, the fuel injection ratio will change continuously with the gradual decrease of the gasoline injection quantity and the gradual increase of the methanol injection quantity, and in this process, the situation that the methanol fuel injection pulse width approaches the nonlinear region will inevitably occur, and at this time, the situations of combustion deterioration, vehicle shaking and poor emission may occur because the accurate calculation of the fuel injection quantity cannot be ensured. In order to avoid the situation that the fuel injection quantity of the methanol fuel is in a non-linear interval, the fuel injection ratio of the methanol fuel at the beginning of switching is directly stepped from 0 to a larger proportion, so that the methanol fuel injector quickly crosses the non-linear interval. The fuel injection quantity of the gasoline injector is gradually reduced along with the increase of the fuel injection ratio, and finally the gasoline injector enters a nonlinear interval, so that the fuel switching process is ended in advance to avoid the problem that the fuel injection quantity of the gasoline fuel entering the nonlinear interval is not controlled, and the fuel injection ratio of the methanol fuel is stepped to 1 to directly enter a methanol mode. Similarly, the same is true when switching from methanol fuel to gasoline fuel.
Further, the operating parameter information includes an exhaust temperature. Step S200 may also include the following cases:
and S230, controlling to switch to the methanol fuel system to supply power to the engine after the gasoline fuel system supplies power to the engine and the exhaust temperature of the engine exceeds the preset exhaust temperature and lasts for a first preset time. Here, the first preset time may be any value ranging from 3s to 5 s.
Because of the greater knock resistance of methanol fuels, engines are typically designed with higher compression ratios and more aggressive firing angles, even though methanol fuels have a much lower propensity for knock and exhaust temperatures than gasoline fuels. Therefore, when the engine is powered by a gasoline fuel system, the exhaust temperature is too high and can be cut to the methanol fuel after a certain time, so that the critical parts such as a catalyst, a gasoline engine particle catcher and the like are prevented from being sintered and damaged due to continuous high temperature.
Further, the operating parameter information includes a temperature of a catalyst in the engine system. Step S200 may also include the following cases:
s240, when the temperature of the catalyst exceeds a preset temperature thresholdThe value controls the gasoline fuel system to power the engine. The gasoline fuel has the advantages of fixed fuel mode, smaller ignition angle and more stable combustion compared with methanol fuel, and can enable the catalyst to reach the ignition working temperature more quickly and convert CO and No in tail gas in time while reducing the primary emissionxAnd the like.
In a preferred embodiment, when the vehicle is started for the first use, the gasoline fuel system is controlled to separately power the engine, then the gasoline fuel system and the methanol fuel system are controlled to simultaneously power the engine according to the preset proportion after the second preset time, and then the methanol fuel system is controlled to separately power the engine after the third preset time so as to exhaust gas in the gasoline fuel system and the methanol fuel system. The predetermined ratio can be selected from 9:1 or 8:2, wherein the ratio of the gasoline fuel system is greater than the ratio of the methanol fuel system.
That is to say, when a new vehicle of the production line is off-line, the air exhaust of an oil way in the gasoline fuel system can be triggered when the new vehicle is started for the first time or several times before the new vehicle is started, and the air exhaust of an oil way in the methanol fuel system can be triggered when the new vehicle is switched to the methanol fuel system, so that the air in two sets of oil supply systems of gasoline and methanol can be exhausted, and frequent flameout during starting and fuel switching can be avoided. The process is completely triggered and executed by an engine controller according to the running state of the engine, a gasoline fuel system is forced to supply energy, the gasoline fuel and the methanol fuel participate in combustion at the same time in a fixed proportion after emptying, the gasoline fuel and the methanol fuel enter the methanol fuel system after the engine runs stably, the gasoline fuel and the methanol fuel are written into a vehicle system after the dual-fuel system is emptied, the vehicle system is not triggered permanently, and the dual-fuel system is switched to be normal. The second preset time and the third preset time may be set to 20 s. And when the gasoline fuel system and the methanol fuel system are exhausted, the fuel injection quantity can be properly improved, and the rotating speed of the engine can be properly improved, so that the combustion can be accelerated, and the air exhaust speed can be accelerated.
In addition, in order to avoid potential risks such as poor vehicle smoothness and poor emission caused by frequent switching of the dual-fuel system in a short time, a certain time window period is required to be passed before the switching action is executed when the switching condition of the dual-fuel system is met. I.e. approximately 3s to 5s before the handover is performed.
Further, in consideration of physical characteristics such as large latent heat of vaporization and poor volatility of methanol fuel, a gasoline fuel system is forcibly used to power an engine at the time of starting a vehicle to ensure reliability of starting the vehicle. In addition, considering that the methanol fuel can release a large amount of toxic gases such as methanol and formaldehyde due to insufficient combustion in the cold stage, and simultaneously, in order to meet the requirement of strict national six regulations on methanol and formaldehyde, even if the vehicle is started, the engine still needs to be forcibly powered by a gasoline fuel system in the cold stage until the temperature of the heat engine reaches 60 ℃ and then can be powered by the methanol fuel system. This is the case with gasoline fuel system power that has been used since the vehicle was started.
And in the other situation, the vehicle is started when the engine is in a heat engine state, even if the condition that the water temperature is 60 ℃ and the methanol is switched is met, the gasoline fuel system is forced to be used for supplying power within a period of time after the starting is finished, and the gasoline fuel system can be switched to supply power after the engine runs stably and the temperature of a combustion chamber is higher. The period of time here is approximately 35s or so.
Further, the engine controller can receive the residual liquid level signal of the methanol fuel system in real time, when the engine runs in the main fuel methanol fuel system and the residual fuel is insufficient, the engine needs to be timely switched to the auxiliary fuel gasoline fuel system, and the instrument panel prompts a driver that the residual fuel is insufficient. In addition, in consideration of the fact that the liquid level of an oil tank fluctuates greatly under the violent driving condition, part of vehicle types even cannot provide accurate, stable and credible liquid level signals, and engine fuel can be switched back and forth along with the fluctuation of the liquid level, so that a proper liquid level threshold value and a hysteresis interval need to be calibrated in consideration of the actual condition, and the problems of combustion deterioration, poor driving performance and increase of harmful gas emission caused by frequent switching in a short time are avoided. The liquid level threshold value here can be selected to be 3L, and the hysteresis interval is realized in the following form: and when the liquid level of the methanol fuel is lower than 3L, switching back to the gasoline fuel system, and if the liquid level of the methanol fuel tank is increased and exceeds 3L due to shaking, only the liquid level of the methanol fuel is continuously increased by more than 5L (increased by 2L on the basis of the liquid level threshold value of 3L) for more than 2 seconds.
Further, the dual-fuel control method also comprises the steps of obtaining information of an accelerator pedal, judging that a driver has the intention of rapid acceleration or overtaking when the opening degree of the accelerator pedal is larger than a certain threshold value, actively cutting off the air conditioner compressor by the engine controller to reduce the load, and switching to a fuel type with higher power output to respond the intention of the driver.
In addition, due to the special anti-corrosion structural design, cost consideration and poor product stability of the methanol fuel pump, after the methanol fuel pump is stood for a long time in a severe cold area in winter, compared with a gasoline pump, the methanol fuel pump may have the situation of weak building pressure capability at low temperature, and a series of problems such as idle speed jitter, engine fire, acceleration of vehicle rise and the like are caused by the fact that oil cannot be supplied continuously and stably during switching of a dual-fuel system. According to the condition, a methanol pump needs to be triggered in advance to pre-pump oil for a certain time, and the methanol pump can be switched to a methanol fuel system to supply energy to the engine after the condition is met.
Fig. 3 is a schematic block diagram of a dual fuel control system 100 according to one embodiment of the invention. As shown in fig. 3, in a specific embodiment, a dual fuel control system 100 for a vehicle includes an obtaining module 10 for obtaining fault information indicating whether a dual fuel system is faulty and operating parameter information of an engine of the vehicle, and a control module 20, where the control module 20 includes a memory 21 and a processor 22, and a computing program is stored in the memory 21, and the computing program is executed by the processor 22 to implement a control method in any one of the above embodiments. The processor 22 may be a Central Processing Unit (CPU), a digital processing unit, or the like. The processor 22 transceives data through the communication interface. The memory 21 is used for storing programs executed by the processor 22. The memory 21 is any medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, or a combination of multiple memories 21. The above-described computing program may be downloaded from a computer-readable storage medium to a corresponding computing/processing device or to a computer or external storage device via a network (e.g., the internet, a local area network, a wide area network, and/or a wireless network). The control module 20 herein includes an engine controller.
The present invention also provides a vehicle equipped with the dual fuel control system 100 described above. The dual fuel control system 100 need not be described in detail herein.
The invention carries out comprehensive judgment according to the running parameter information of the engine and the fault mode of the core parts, selects an optimal fuel for combustion, and cancels the function of triggering and switching by a key according to subjective intention of a driver so as to realize better economic benefit, more comfortable driving experience and higher social environmental protection value. The invention can effectively solve a series of development links and the problems of after-sale markets only through the software function without improving hardware completely through a software method, and saves the development cost.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A dual fuel control method for a vehicle, comprising:
acquiring fault information of a vehicle for indicating whether a dual-fuel system is in fault and operating parameter information of an engine system;
and controlling one fuel system in the dual-fuel systems to supply power to the engine according to the fault information and the operation parameter information, and controlling the dual-fuel systems to be switched with each other so as to enable the engine to operate normally.
2. The dual fuel control method of claim 1,
the dual-fuel system is a methanol fuel system and a gasoline fuel system.
3. The dual fuel control method of claim 2,
when the gasoline fuel system fails, controlling a display unit to remind a user of the failure of the gasoline fuel system;
when the methanol fuel system fails and the gasoline fuel system does not fail, the control is switched to the gasoline fuel system to supply energy to the engine, and the display unit is controlled to remind a user of the failure of the methanol fuel system.
4. The dual-fuel control method as claimed in claim 3, characterized in that the step of controlling the mutual switching between the dual-fuel systems comprises in particular:
in the process of switching the gasoline fuel system to the methanol fuel system, the fuel injection quantity of the gasoline fuel is gradually reduced, the fuel injection quantity of the methanol fuel is gradually increased, and the fuel injection ratio of the methanol fuel is directly increased to a first preset threshold value; when the fuel injection quantity of the gasoline fuel is reduced to a second preset threshold value, controlling to directly reduce the fuel injection ratio of the gasoline fuel to 0%;
wherein the fuel injection ratio is any value in the range of 0-100%, and the sum of the fuel injection ratio of the methanol fuel and the fuel injection ratio of the gasoline fuel is 100%.
5. The dual fuel control method of claim 4, wherein the step of controlling the switching between the dual fuel systems further comprises:
in the process of switching the methanol fuel system to the gasoline fuel system, the fuel injection quantity of the methanol fuel is gradually reduced, the fuel injection quantity of the gasoline fuel is gradually increased, and the fuel injection ratio of the gasoline fuel is directly increased to a third preset threshold value; when the fuel injection quantity of the methanol fuel is reduced to a fourth preset threshold value, the fuel injection ratio of the methanol fuel is directly reduced to 0% by control.
6. The dual fuel control method of claim 2,
the operating parameter information includes an exhaust temperature;
the gasoline fuel system does the engine energy supply, just the exhaust temperature of engine surpasss and predetermines exhaust temperature and last control switch to behind the first preset time the methanol fuel system does the engine energy supply.
7. The dual fuel control method of claim 2,
the operating parameter information includes a temperature of a catalyst in the engine system;
and controlling the gasoline fuel system to supply energy to the engine when the temperature of the catalyst exceeds a preset temperature threshold value.
8. The dual fuel control method of claim 2,
when the vehicle is started for the first use, the gasoline fuel system is controlled to supply energy to the engine independently, then the gasoline fuel system and the methanol fuel system are controlled to supply energy to the engine simultaneously according to a preset proportion after the second preset time, and then the methanol fuel system is controlled to supply energy to the engine independently after the third preset time so as to discharge gas in the gasoline fuel system and the methanol fuel system.
9. A dual fuel control system for a vehicle, comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring fault information of a vehicle for indicating whether a dual-fuel system has a fault and operation parameter information of an engine system; and
a control module comprising a memory and a processor, the memory having stored therein a computing program, the computing program when executed by the processor being for implementing the control method according to any one of claims 1-8.
10. A vehicle characterized in that it is equipped with a dual fuel control system as claimed in claim 9.
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