CN112796895A - Fuel mode switching method and system of dual-fuel vehicle and vehicle - Google Patents
Fuel mode switching method and system of dual-fuel vehicle and vehicle Download PDFInfo
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- CN112796895A CN112796895A CN202011606709.8A CN202011606709A CN112796895A CN 112796895 A CN112796895 A CN 112796895A CN 202011606709 A CN202011606709 A CN 202011606709A CN 112796895 A CN112796895 A CN 112796895A
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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
- F02D19/0602—Control of components of the fuel supply system
- F02D19/0613—Switch-over from one fuel to another
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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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- 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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- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a fuel mode switching method and system for a dual-fuel vehicle and the vehicle, wherein the method comprises the following steps: when the first fuel system is in a fault state, judging whether the vehicle is in a second fuel mode or a first fuel mode; when the vehicle is in the second fuel mode, the running state of the first fuel system is judged again until the first fuel system is in a normal state, and the second fuel mode is switched to a switchable mode; when the vehicle is in the first fuel mode, controlling the first fuel mode to be switched to the second fuel mode, and judging the running state of the first fuel system again until the first fuel system is in a normal state, and switching the second fuel mode to be switched to the switchable mode; the invention can switch the first fuel mode to the second fuel mode when the first fuel system is in a failure state and the vehicle is in the first fuel mode, thereby solving the problem caused by the incapability of switching the second fuel system when the first fuel system fails.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a fuel mode switching method and system for a dual-fuel vehicle and the vehicle.
Background
With the environmental and energy problems becoming more severe, the amount of petroleum energy is becoming smaller and the price is becoming higher, and vehicles using only petroleum energy have not been able to meet the future development demands. The dual-fuel automobile using natural gas, methanol and the like as main fuels is more and more emphasized due to the characteristics of superior emission performance, low use cost and good economic effect.
However, because the starting performance of fuels such as natural gas, methanol and the like is poor, the conventional dual-fuel automobile is usually started by using gasoline, and the gasoline mode is switched to the main fuel after the water temperature of the automobile, the running time of the engine and the rotating speed of the engine all meet certain conditions; the existing dual-fuel automobile only has a one-way function of switching from a gasoline mode to a main fuel mode. When the main fuel system has faults, such as faults of a methanol fuel injector and an oil pump, the main fuel system can directly influence driving due to abnormal operation, and even leads to flameout of a vehicle in severe cases. At this time, although the gasoline supply system is still available, the vehicle can only be passively maintained in the faulty main fuel system to run in a faulty condition or wait for maintenance on site because of the inability to make active switching.
Based on the shortcomings of the prior art, there is an urgent need to develop a fuel mode switching method and system for a dual-fuel vehicle, and a vehicle, so as to solve the above problems.
Disclosure of Invention
In order to solve the technical problems, the invention discloses a fuel mode switching method and system for a dual-fuel vehicle and the vehicle.
The invention discloses a fuel mode switching method and system of a dual-fuel vehicle and the vehicle, wherein a fuel system of the vehicle comprises a second fuel system and a first fuel system, and the method comprises the following steps:
acquiring first state information of a first fuel system in real time, and judging the running state of the first fuel system according to the first state information;
when the first fuel system is in a fault state, judging whether the vehicle is in a second fuel mode or a first fuel mode;
when the vehicle is in a second fuel mode, the running state of the first fuel system is judged again, and the second fuel mode is switched to a switchable mode until the first fuel system is in a normal state;
when the vehicle is in a first fuel mode, controlling the first fuel mode to be switched to a second fuel mode, and judging the running state of the first fuel system again until the first fuel system is in a normal state, and switching the second fuel mode to be a switchable mode.
Further, the determining the operating state of the first fuel system according to the first state information includes:
judging whether the first state information meets a first preset condition or not according to the first state information;
if the first state information meets the first preset condition, determining that the first fuel system is in a normal state;
and if the first state information does not meet the first preset condition, determining that the first fuel system is in a fault state.
Further, the first state information comprises a fault state feedback value of the oil pump controller of the first fuel, a fault state feedback value of the injector driving module, an output voltage value or current value of the first fuel injector and an output voltage value or current value of the first fuel oil pump relay;
the judging whether the first state information meets a first preset condition or not according to the first state information comprises the following steps:
judging whether a fault state feedback value of an oil pump controller of the first fuel, a fault state feedback value of an oil injector driving module, an output voltage value or a current value of a first fuel oil injector and an output voltage value or a current value of a first fuel oil pump relay meet the first preset condition, wherein the first preset condition is that the fault state feedback value of the oil pump controller of the first fuel is in a sixth preset range, the fault state feedback value of the oil injector driving module is in a fifth preset range, the current value of the first fuel oil injector is in the first preset range or the output voltage value of the first fuel oil injector is in a third preset range, and the current value of the first fuel oil pump relay is in the second preset range or the output voltage value of the first fuel oil pump relay is in the fourth preset range;
and if the fault state feedback value of the oil pump controller of the first fuel, the fault state feedback value of the fuel injector driving module, the output voltage value or current value of the first fuel injector and the output voltage value or current value of the first fuel oil pump relay meet the first preset condition, judging that the first fuel system is in a normal state.
Further, if the fault state feedback value of the oil pump controller of the first fuel, the fault state feedback value of the injector driving module, the output voltage value or current value of the first fuel injector, and the output voltage value or current value of the first fuel oil pump relay satisfy the first preset condition, determining that the first fuel system is in a normal state includes:
if the fault state feedback value of the oil pump controller of the first fuel, the fault state feedback value of the fuel injector driving module, the output voltage value or current value of the first fuel injector and the output voltage value or current value of the first fuel oil pump relay meet the first preset condition;
acquiring a misfire signal of a vehicle;
comparing the misfire signal to a preset threshold;
and if the misfire signal is less than the preset threshold value, determining that the first fuel system is in a normal state.
Further, said determining whether the vehicle is in the second fuel mode or the first fuel mode when said first fuel system is in a fault condition comprises:
acquiring a signal of a vehicle zone bit;
judging whether the vehicle is in a second fuel mode or a first fuel mode according to the signal of the vehicle zone bit and a first data table; the first data table is used for recording the mapping relation between the vehicle flag bit and the second fuel mode and the first fuel mode.
Further, when the vehicle is in the first fuel mode, controlling the first fuel mode to be switched to the second fuel mode, and re-determining the operating state of the first fuel system until the first fuel system is in the normal state, after switching the second fuel mode to the switchable mode, the method further includes:
acquiring second state information of the vehicle;
judging whether the second state information meets a second preset condition or not according to the second state information;
and when the second state information meets the second preset condition, switching the second fuel mode into the first fuel mode.
Further, after determining whether the second state information satisfies a second preset condition according to the second state information, the method further includes:
and if the second state information does not meet a second preset condition, determining that the vehicle does not meet a mode switching condition, and keeping the working mode of the vehicle in a second fuel mode.
Further, the second state information includes a water temperature of the engine, a running time of the engine, and a pressure value of the first fuel system;
the judging whether the second state information meets a second preset condition according to the second state information includes:
judging whether the water temperature of the engine, the running time of the engine and the pressure value of the first fuel system meet the second preset condition, wherein the second preset condition is that the water temperature of the engine is not less than a second preset value, the running time of the engine is not less than a third preset value and the pressure value of the first fuel system is not less than a fourth preset value;
if the water temperature of the engine, the running time of the engine and the pressure value of the first fuel system meet the second preset condition, judging that the vehicle meets a mode switching condition;
and if the water temperature of the engine, the running time of the engine and the pressure value of the first fuel system do not meet the second preset condition, judging that the vehicle does not meet the mode switching condition.
The present invention also provides a fuel mode switching system of a dual fuel vehicle, the system including:
the acquisition module is used for acquiring first state information of the first fuel system in real time;
the judging module is used for judging the running state of the first fuel system according to the first state information; and when the first fuel system is in a fault state, judging whether the vehicle is in a second fuel mode or a first fuel mode;
a switching module to switch a second fuel mode to a switchable mode when the vehicle is in the second fuel mode and the first fuel system is in a normal state; when the vehicle is in a first fuel mode, controlling the first fuel mode to be switched into a second fuel mode, and when the first fuel system is in a normal state, switching the second fuel mode into a switchable mode.
The invention also provides a vehicle provided with the fuel mode switching system of the dual-fuel vehicle.
The embodiment of the invention has the following beneficial effects:
1. the invention can switch the first fuel mode to the second fuel mode when the first fuel system is in a failure state and the working mode of the vehicle is the first fuel mode, thereby solving the problems of flameout and the like caused by the fact that the second fuel system cannot be switched when the first fuel system fails.
2. According to the invention, when the first fuel system is in a fault state, the first state information of the first fuel system is obtained again, and the running state of the first fuel system is judged until the first fuel system is in a normal state, at this time, the working mode of the vehicle can be switched from the second fuel mode to the first fuel mode, so that the working mode of the vehicle is freely switched, the second fuel mode is prevented from being used all the time, and further, the vehicle has the advantages of excellent emission performance, low use cost and good economic effect.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a flow chart of a fuel mode switching method for a dual fuel vehicle according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a fuel mode switching system of a dual-fuel vehicle according to an embodiment of the present invention.
Wherein the reference numerals in the figures correspond to:
1-an acquisition module; 2-a judging module; and 3, switching the module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or 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.
The engine control system described in the prior art has the following disadvantages: because natural gas starting performance is poor, the conventional dual-fuel automobile is usually started by using gasoline, and the second fuel mode is switched to the first fuel mode after the water temperature of the automobile, the running time of an engine and the rotating speed of the engine meet certain conditions; and the existing dual-fuel automobile only has a one-way function of switching from the second fuel mode to the first fuel mode. When the first fuel system has faults, such as faults of a methanol fuel injector and an oil pump, the first fuel system can directly influence driving due to abnormal operation, and even the vehicle is flameout when the first fuel system is serious. At this time, although the gasoline supply system is still available, the vehicle can only be passively maintained in the faulty first fuel system to run in a faulty condition or wait for maintenance on site because active switching cannot be performed.
Aiming at the defects of the prior art, the embodiment of the invention provides a fuel mode switching method of a dual-fuel vehicle, which can switch a first fuel mode to a second fuel mode when a first fuel system is in a fault state and the working mode of the vehicle is the first fuel mode, so that the problems of flameout and the like caused by incapability of switching the second fuel system when the first fuel system is in a fault state are solved; and when the first fuel system is in a fault state, the first state information of the first fuel system is acquired again, the running state of the first fuel system is judged until the first fuel system is in a normal state, and the working mode of the vehicle can be switched from the second fuel mode to the first fuel mode, so that the working mode of the vehicle is freely switched, the second fuel mode is prevented from being used all the time, and the vehicle has the advantages of excellent emission performance, low use cost and good economic effect.
Referring to fig. 1-2, the present embodiment provides a fuel mode switching method, system and vehicle for a dual-fuel vehicle, the fuel system of the vehicle comprises a second fuel system and a first fuel system, the method comprises the following steps:
s1: acquiring first state information of a first fuel system in real time, and judging the running state of the first fuel system according to the first state information;
s2: when the first fuel system is in a fault state, judging whether the vehicle is in a second fuel mode or a first fuel mode;
s3: when the vehicle is in a second fuel mode, the running state of the first fuel system is judged again, and the second fuel mode is switched to a switchable mode until the first fuel system is in a normal state;
s4: when the vehicle is in a first fuel mode, controlling the first fuel mode to be switched to a second fuel mode, and judging the running state of the first fuel system again until the first fuel system is in a normal state, and switching the second fuel mode to be a switchable mode.
It should be noted that: in the invention, as long as the first fuel system is in a fault state, the working mode of the vehicle is switched or maintained to be the second fuel mode, and the running state of the first fuel system is judged again until the first fuel system is in a normal state, so that the working mode of the vehicle can be switched from the second fuel mode to the first fuel mode when the second state information of the vehicle meets a second preset condition, and the problems of flameout and the like caused by the fact that the second fuel system cannot be switched when the first fuel system is in a fault state are solved; and when the first fuel system is in a fault state, the first state information of the first fuel system is acquired again, the running state of the first fuel system is judged until the first fuel system is in a normal state, and the working mode of the vehicle can be switched from the second fuel mode to the first fuel mode, so that the working mode of the vehicle is freely switched, the second fuel mode is prevented from being used all the time, and the vehicle has the advantages of excellent emission performance, low use cost and good economic effect.
In particular, the switchable mode is such that the vehicle is able to switch the second fuel mode to the first fuel mode.
Preferably, the determining the operation state of the first fuel system based on the first state information includes:
judging whether the first state information meets a first preset condition or not according to the first state information;
if the first state information meets the first preset condition, determining that the first fuel system is in a normal state;
and if the first state information does not meet the first preset condition, determining that the first fuel system is in a fault state.
Specifically, when the first fuel system is in a failure state, the operating mode of the vehicle can only be the second fuel mode.
Preferably, the first state information includes a fault state feedback value of the oil pump controller of the first fuel and a fault state feedback value of the injector driving module, an output voltage value or current value of the first fuel injector, and an output voltage value or current value of the first fuel oil pump relay;
the judging whether the first state information meets a first preset condition or not according to the first state information comprises the following steps:
judging whether a fault state feedback value of an oil pump controller of the first fuel, a fault state feedback value of an oil injector driving module, an output voltage value or a current value of a first fuel oil injector and an output voltage value or a current value of a first fuel oil pump relay meet the first preset condition, wherein the first preset condition is that the fault state feedback value of the oil pump controller of the first fuel is in a sixth preset range or the fault state feedback value of the oil injector driving module is in a fifth preset range, the current value of the first fuel oil injector is in the first preset range or the output voltage value of the first fuel oil injector is in a third preset range, and the current value of the first fuel oil pump relay is in the second preset range or the output voltage value of the first fuel oil pump relay is in the fourth preset range;
and if the fault state feedback value of the oil pump controller of the first fuel, the fault state feedback value of the fuel injector driving module, the output voltage value or current value of the first fuel injector and the output voltage value or current value of the first fuel oil pump relay meet the first preset condition, judging that the first fuel system is in a normal state.
And if any one of the fault state feedback value of the oil pump controller of the first fuel, the fault state feedback value of the injector driving module, the output voltage value or current value of the first fuel injector and the output voltage value or current value of the first fuel oil pump relay does not meet the first preset condition, judging that the first fuel system is in a fault state.
In some possible embodiments, the first status information includes a failure status feedback value of the controller of the first fuel, an output voltage value of the first fuel injector, and an output voltage value of the first fuel pump relay; and judging whether the first state information meets a first preset condition or not according to the first state information.
In still other possible embodiments, the first state information includes a failure state feedback value of the drive module, an output current value of the first fuel injector, and an output current value of the first fuel pump relay; and judging whether the first state information meets a first preset condition or not according to the first state information.
In still other possible embodiments, the first state information includes a failure state feedback value of the controller of the first fuel, an output voltage value of the first fuel injector, and an output current value of the first fuel pump relay; and judging whether the first state information meets a first preset condition or not according to the first state information.
In still other possible embodiments, the first state information includes a failure state feedback value of the controller of the first fuel, an output current value of the first fuel injector, and an output voltage value of the first fuel pump relay; and judging whether the first state information meets a first preset condition or not according to the first state information.
In some embodiments, the fuel of the second fuel system may be gasoline, diesel oil, or the like, and the fuel of the first fuel system may be methanol, so the first fuel system may also be a methanol fuel system, where the methanol fuel system includes a methanol injector, a methanol injector drive control module, a methanol oil pump relay, a methanol oil pump, and the like, and the methanol fuel system may have the following faults:
the methanol oil sprayer driving control module is opened, the methanol oil sprayer driving control module is short-circuited to a power supply, the methanol oil sprayer driving control module is short-circuited to the ground and other circuit faults;
faults such as failure of a memory of the methanol fuel injector driving module, overhigh battery voltage, overlow battery voltage and the like;
open circuit of methanol fuel injector, short circuit to power supply, short circuit to ground, etc.;
the methanol oil pump relay is open-circuited, short-circuited to a power supply, short-circuited to the ground and other circuit faults;
the methanol oil pump faults comprise faults of methanol pump current error, pump locked-rotor, pump open-circuit, controller and pump accumulation faults and the like.
According to the above fault of the methanol fuel system, it can be known that the first preset condition may also be that a fault state feedback value of the methanol injector drive control module is within an eighth preset range, a fault state feedback value of the methanol pump is within a seventh preset range, and the like.
When the fault state feedback value of the controller of the first fuel is in an eighth preset range and the fault state feedback value of the driving module is in a seventh preset range, judging that the fuel system is in a normal state; and when the fault state feedback value of the controller of the first fuel is not in an eighth preset range or the fault state feedback value of the driving module is not in a seventh preset range, judging that the fuel system is in a fault state.
Preferably, the determining that the first fuel system is in the normal state if the failure state feedback value of the oil pump controller of the first fuel, the failure state feedback value of the injector driving module, the output voltage value or current value of the first fuel injector, and the output voltage value or current value of the first fuel oil pump relay satisfy the first preset condition includes:
if the fault state feedback value of the oil pump controller of the first fuel, the fault state feedback value of the fuel injector driving module, the output voltage value or current value of the first fuel injector and the output voltage value or current value of the first fuel oil pump relay meet the first preset condition;
acquiring a misfire signal of a vehicle;
comparing the misfire signal to a preset threshold;
determining that the first fuel system is in a fault condition if the misfire signal is not less than the preset threshold;
and if the misfire signal is less than the preset threshold value, determining that the first fuel system is in a normal state.
Specifically, after the current value of a first fuel injector and the current value of a first fuel pump relay meet the first preset condition, the relation between a misfire signal of a vehicle and a preset threshold value needs to be judged, when the misfire signal of the vehicle is not smaller than the preset threshold value, the first fuel system is judged to be in a fault state, and the working mode of the vehicle can only be a second fuel mode; and when the misfire signal of the vehicle is smaller than the preset threshold value, judging that the first fuel system is in a normal state, judging whether second state information of the vehicle meets a second preset condition, and when the second state information of the vehicle meets the second preset condition, judging that the second fuel mode can be switched to the first fuel mode.
Preferably, said determining whether the vehicle is in the second fuel mode or the first fuel mode when said first fuel system is in a fault condition comprises:
acquiring a signal of a vehicle zone bit;
judging whether the vehicle is in a second fuel mode or a first fuel mode according to the signal of the vehicle zone bit and a first data table; the first data table is used for recording the mapping relation between the vehicle flag bit and the second fuel mode and the first fuel mode.
Specifically, the signal of the vehicle flag bit is calibrated in advance, and a first data table is made between a second fuel mode and a first fuel mode, and the vehicle can directly acquire the working mode of the vehicle according to the first data table and the signal of the vehicle flag bit.
Preferably, when the vehicle is in the first fuel mode, controlling the first fuel mode to be switched to the second fuel mode, and re-determining the operating state of the first fuel system until the first fuel system is in the normal state, after switching the second fuel mode to the switchable mode, further includes:
acquiring second state information of the vehicle;
judging whether the second state information meets a second preset condition or not according to the second state information;
and when the second state information meets the second preset condition, switching the second fuel mode into the first fuel mode.
Specifically, when the working mode of the vehicle is a first fuel mode and the first fuel mode is in a fault state, the working mode of the vehicle is controlled to be switched from the first fuel mode to a second fuel mode; the operating state of the first fuel system is obtained again, and whether second state information of the vehicle meets a second preset condition cannot be judged until the first fuel system is in a normal state, wherein the second preset condition can be regarded as a condition for switching the second fuel mode into the first fuel mode; and when the second state information of the vehicle meets the second preset condition, controlling the working mode of the vehicle to be switched from the second fuel mode to the first fuel mode.
Preferably, after determining whether the second state information satisfies a second preset condition according to the second state information, the method further includes:
and if the second state information does not meet a second preset condition, determining that the vehicle does not meet a mode switching condition, and keeping the working mode of the vehicle in a second fuel mode.
Preferably, the second state information includes a water temperature of the engine, a running time of the engine, and a pressure value of the first fuel system;
the judging whether the second state information meets a second preset condition according to the second state information includes:
judging whether the water temperature of the engine, the running time of the engine and the pressure value of the first fuel system meet the second preset condition, wherein the second preset condition is that the water temperature of the engine is not less than a second preset value, the running time of the engine is not less than a third preset value and the pressure value of the first fuel system is not less than a fourth preset value;
if the water temperature of the engine, the running time of the engine and the pressure value of the first fuel system meet the second preset condition, judging that the vehicle meets a mode switching condition;
and if the water temperature of the engine, the running time of the engine and the pressure value of the first fuel system do not meet the second preset condition, judging that the vehicle does not meet the mode switching condition.
In some possible embodiments, the second preset value may be set to 60 ° and the running time of the engine may be set to 30 seconds.
In some possible embodiments, the second preset condition includes the rotation speed of the engine in addition to the above conditions, and it is understood that the second preset condition is that the water temperature of the engine is not less than a second preset value, the operation time of the engine is not less than a third preset value, the pressure value of the first fuel system is not less than a fourth preset value, and the rotation speed of the engine is not less than a fifth preset value.
Specifically, the pressure value of the first fuel system may be replaced with a value at which the remaining amount of the first fuel in the first fuel system is not less than a fourth preset value.
In some possible embodiments, said fourth preset value may be set to 3 liters.
The present invention also provides a fuel mode switching system of a dual fuel vehicle, the system including:
the system comprises an acquisition module 1, a control module and a control module, wherein the acquisition module is used for acquiring first state information of a first fuel system in real time;
the judging module 2 is used for judging the running state of the first fuel system according to the first state information; and when the first fuel system is in a fault state, judging whether the vehicle is in a second fuel mode or a first fuel mode;
a switching module 3 for switching a second fuel mode to a switchable mode when the vehicle is in the second fuel mode and the first fuel system is in a normal state; when the vehicle is in a first fuel mode, controlling the first fuel mode to be switched into a second fuel mode, and when the first fuel system is in a normal state, switching the second fuel mode into a switchable mode.
The invention also provides a vehicle provided with the fuel mode switching system of the dual-fuel vehicle.
In some possible embodiments, the vehicle further comprises a controller and a detection device, the controller being electrically connected to the detection device; the detection device comprises a temperature sensor, a pressure sensor and the like; the temperature sensor is used for acquiring water temperature in the engine, and the pressure sensor is used for acquiring a pressure value of the first fuel system.
In some possible embodiments, the vehicle further comprises an alarm electrically connected to the controller, the alarm configured to: when the first fuel system is in a fault state and the working mode of the vehicle is a second fuel mode, sending out first prompt information; when the first fuel system is in a fault state and the working mode of the vehicle is a first fuel mode, sending out second prompt information; when the first fuel system is in a normal state and the working mode of the vehicle is a second fuel mode, sending a third prompt message; when the first fuel system is in a normal state and the working mode of the vehicle is the first fuel mode, sending out fourth prompt information; wherein the first prompt message is used for prompting the driver that the vehicle is in the second fuel mode and the first fuel system is in failure at the moment, and the first fuel mode is inhibited; the second prompt message is used for prompting the driver that the vehicle is in the first fuel mode and the first fuel system is in failure at the moment, and the first fuel mode is inhibited; the third prompt message is used for prompting the driver that the vehicle is in the second fuel mode; the fourth prompt is for prompting the driver that the vehicle is in the first fuel mode. The warning indicator can comprise a display screen or a voice prompt device, the first prompt message, the second prompt message, the third prompt message and the fourth prompt message can be voice prompt or image prompt, and the controller controls the warning indicator to send out the prompt messages mainly aiming at: the driver can timely make response operation according to the prompt information when necessary, and the safety of the driver in driving the vehicle is ensured.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention.
Claims (10)
1. A fuel mode switching method for a dual fuel vehicle, a fuel system of the vehicle including a first fuel system and a second fuel system, the method comprising the steps of:
acquiring first state information of a first fuel system in real time, and judging the running state of the first fuel system according to the first state information;
when the first fuel system is in a fault state, judging whether the vehicle is in a second fuel mode or a first fuel mode;
when the vehicle is in a second fuel mode, the running state of the first fuel system is judged again, and the second fuel mode is switched to a switchable mode until the first fuel system is in a normal state;
when the vehicle is in a first fuel mode, controlling the first fuel mode to be switched to a second fuel mode, and judging the running state of the first fuel system again until the first fuel system is in a normal state, and switching the second fuel mode to be a switchable mode.
2. The fuel mode switching method of a dual fuel vehicle as claimed in claim 1, wherein the determining the operation state of the first fuel system according to the first state information comprises:
judging whether the first state information meets a first preset condition or not according to the first state information;
if the first state information meets the first preset condition, determining that the first fuel system is in a normal state;
and if the first state information does not meet the first preset condition, determining that the first fuel system is in a fault state.
3. The fuel mode switching method of a dual fuel vehicle according to claim 2, characterized in that the first state information includes a failure state feedback value of an oil pump controller of the first fuel and a failure state feedback value of an injector drive module, an output voltage value or current value of the first fuel injector, and an output voltage value or current value of the first fuel oil pump relay;
the judging whether the first state information meets a first preset condition or not according to the first state information comprises the following steps:
judging whether a fault state feedback value of an oil pump controller of the first fuel, a fault state feedback value of an oil injector driving module, an output voltage value or a current value of a first fuel oil injector and an output voltage value or a current value of a first fuel oil pump relay meet the first preset condition, wherein the first preset condition is that the fault state feedback value of the oil pump controller of the first fuel is in a sixth preset range, the fault state feedback value of the oil injector driving module is in a fifth preset range, the current value of the first fuel oil injector is in the first preset range or the output voltage value of the first fuel oil injector is in a third preset range, and the current value of the first fuel oil pump relay is in the second preset range or the output voltage value of the first fuel oil pump relay is in the fourth preset range;
and if the fault state feedback value of the oil pump controller of the first fuel, the fault state feedback value of the fuel injector driving module, the output voltage value or current value of the first fuel injector and the output voltage value or current value of the first fuel oil pump relay meet the first preset condition, judging that the first fuel system is in a normal state.
4. The fuel mode switching method of a dual fuel vehicle according to claim 3, wherein said determining that the first fuel system is in a normal state if the failure state feedback value of the oil pump controller of the first fuel, the failure state feedback value of the injector drive module, the output voltage value or current value of the first fuel injector, and the output voltage value or current value of the first fuel pump relay satisfy the first preset condition comprises:
if the fault state feedback value of the oil pump controller of the first fuel, the fault state feedback value of the fuel injector driving module, the output voltage value or current value of the first fuel injector and the output voltage value or current value of the first fuel oil pump relay meet the first preset condition;
acquiring a misfire signal of a vehicle;
comparing the misfire signal to a preset threshold;
and if the misfire signal is less than the preset threshold value, determining that the first fuel system is in a normal state.
5. The fuel mode switching method of a dual fuel vehicle of claim 4, wherein said determining whether the vehicle is in the second fuel mode or the first fuel mode when the first fuel system is in the fault state comprises:
acquiring a signal of a vehicle zone bit;
judging whether the vehicle is in a second fuel mode or a first fuel mode according to the signal of the vehicle zone bit and a first data table; the first data table is used for recording the mapping relation between the vehicle flag bit and the second fuel mode and the first fuel mode.
6. The fuel mode switching method of a dual fuel vehicle as claimed in claim 5, wherein the controlling the first fuel mode to switch to the second fuel mode when the vehicle is in the first fuel mode and re-determining the operation state of the first fuel system until the second fuel mode is switched to the switchable mode when the first fuel system is in the normal state further comprises:
acquiring second state information of the vehicle;
judging whether the second state information meets a second preset condition or not according to the second state information;
and when the second state information meets the second preset condition, switching the second fuel mode into the first fuel mode.
7. The fuel mode switching method of a dual-fuel vehicle as claimed in claim 6, wherein the determining whether the second state information satisfies a second preset condition according to the second state information further comprises:
and if the second state information does not meet a second preset condition, determining that the vehicle does not meet a mode switching condition, and keeping the working mode of the vehicle in a second fuel mode.
8. The fuel mode switching method of a dual fuel vehicle as claimed in claim 7, wherein the second state information includes a water temperature of the engine, a running time of the engine, and a pressure value of the first fuel system;
the judging whether the second state information meets a second preset condition according to the second state information includes:
judging whether the water temperature of the engine, the running time of the engine and the pressure value of the first fuel system meet the second preset condition, wherein the second preset condition is that the water temperature of the engine is not less than a second preset value, the running time of the engine is not less than a third preset value and the pressure value of the first fuel system is not less than a fourth preset value;
if the water temperature of the engine, the running time of the engine and the pressure value of the first fuel system meet the second preset condition, judging that the vehicle meets a mode switching condition;
and if the water temperature of the engine, the running time of the engine and the pressure value of the first fuel system do not meet the second preset condition, judging that the vehicle does not meet the mode switching condition.
9. A fuel mode switching system for a dual fuel vehicle, the system comprising:
the acquisition module is used for acquiring first state information of the first fuel system in real time;
the judging module is used for judging the running state of the first fuel system according to the first state information; and when the first fuel system is in a fault state, judging whether the vehicle is in a second fuel mode or a first fuel mode;
a switching module to switch a second fuel mode to a switchable mode when the vehicle is in the second fuel mode and the first fuel system is in a normal state; when the vehicle is in a first fuel mode, controlling the first fuel mode to be switched into a second fuel mode, and when the first fuel system is in a normal state, switching the second fuel mode into a switchable mode.
10. A vehicle characterized by being provided with the fuel mode switching system of the dual fuel vehicle as claimed in claim 9.
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