CN117536745A - Method and system for adjusting fuel vapor in fuel tank of hybrid electric vehicle and engine system - Google Patents
Method and system for adjusting fuel vapor in fuel tank of hybrid electric vehicle and engine system Download PDFInfo
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- CN117536745A CN117536745A CN202311491372.4A CN202311491372A CN117536745A CN 117536745 A CN117536745 A CN 117536745A CN 202311491372 A CN202311491372 A CN 202311491372A CN 117536745 A CN117536745 A CN 117536745A
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- 239000000446 fuel Substances 0.000 title claims abstract description 207
- 239000002828 fuel tank Substances 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 36
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 91
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 87
- 238000001179 sorption measurement Methods 0.000 claims abstract description 34
- 238000002955 isolation Methods 0.000 claims abstract description 33
- 230000001276 controlling effect Effects 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 238000003795 desorption Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000003610 charcoal Substances 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/0854—Details of the absorption canister
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/089—Layout of the fuel vapour installation
Abstract
The invention discloses a method and a system for adjusting fuel vapor in a fuel tank of a hybrid electric vehicle and an engine system, wherein the method comprises the following steps: calculating the current fuel steam quantity in the fuel tank according to the fuel tank parameters by acquiring the fuel tank parameters at the current moment; judging whether the current fuel steam quantity reaches the preset adsorption quantity of the carbon tank or not; and if the current fuel vapor quantity reaches the preset adsorption quantity, controlling the opening of the fuel tank isolation valve so that the current fuel vapor in the fuel tank enters the carbon tank. According to the technical scheme provided by the embodiment of the invention, the current fuel vapor quantity in the fuel tank is calculated through the fuel tank parameters, and before the current fuel vapor quantity in the fuel tank exceeds the preset maximum adsorption quantity of the carbon tank, the fuel tank isolation valve is opened, so that the fuel vapor enters the carbon tank and is completely adsorbed by the carbon tank, the fuel vapor is effectively prevented from escaping and polluting the environment caused by overload of the carbon tank, and the environmental protection performance of the vehicle is improved.
Description
Technical Field
The invention relates to the technical field of vehicle control, in particular to a method and a system for adjusting fuel vapor in a fuel tank of a hybrid electric vehicle and an engine system.
Background
In the whole vehicle evaporation and emission system, because gasoline is volatile liquid fuel, the fuel tank is always filled with fuel vapor even in a normal temperature environment. In order to avoid the fuel vapor volatilized to the atmosphere and pollute the environment, the fuel vapor needs to be adsorbed through a carbon tank, then in the proper working condition of an engine, the negative pressure of an air inlet pipe is utilized, a carbon tank control valve is opened, the adsorbed fuel vapor in the carbon tank is desorbed, and the adsorbed fuel vapor enters the engine through an air inlet manifold to be combusted, so that the evaporation emission is reduced.
The traditional power automobile needs the engine to run to effectively desorb the carbon tank. However, for a hybrid electric vehicle, especially for a hybrid electric vehicle with medium and strong mixing, the engine running time is shorter, and if the fuel vapor adsorbed in the carbon tank is higher at this time and is not desorbed in time, the fuel vapor can escape from the carbon tank, so that the environment is polluted due to excessively high evaporation and emission.
In order to solve the above problems, a high-pressure fuel tank is generally used for a hybrid vehicle, and whether fuel vapor enters a canister is controlled by a tank isolation valve. When the tank isolation valve is closed, the fuel vapor is sealed in the high pressure tank and cannot enter the canister.
However, the high-pressure fuel tank has a pressure-resistant limit value, so that the fuel vapor cannot be always sealed in the high-pressure fuel tank. When the pressure of the fuel tank exceeds the upper pressure-resistant limit, the fuel tank isolation valve needs to be opened immediately to discharge fuel vapor into the carbon tank, and at the moment, the high-pressure fuel vapor can overload the carbon tank, so that the fuel vapor escapes from the carbon tank, and environmental pollution is caused.
Disclosure of Invention
The invention provides a method and a system for adjusting fuel vapor in a fuel tank of a hybrid electric vehicle and an engine system, and aims to solve the problem that the fuel vapor escapes from a carbon tank and causes environmental pollution due to overload of the carbon tank by the existing method for adjusting the fuel vapor in the fuel tank.
According to one aspect of the invention, there is provided a method for regulating fuel vapor in a fuel tank of a hybrid vehicle, comprising:
acquiring the oil tank parameters at the current moment, wherein the oil tank parameters at least comprise oil tank pressure, oil tank temperature and fuel volume in the oil tank;
calculating the current fuel steam quantity in the fuel tank according to the fuel tank parameters;
judging whether the current fuel steam quantity reaches the preset adsorption quantity of the carbon tank or not;
and if the current fuel steam quantity reaches the preset adsorption quantity, controlling an oil tank isolation valve to be opened, so that the current fuel steam in the oil tank enters the carbon tank.
Optionally, the calculating the current fuel vapor amount in the fuel tank according to the fuel tank parameter includes:
calculating an initial value of fuel steam in the fuel tank according to an ideal gas equation;
constructing an estimation equation of the fuel vapor quantity in the fuel tank according to the ideal gas equation;
and calculating the current fuel vapor amount in the fuel tank by using the initial value of the fuel vapor amount and the estimation equation.
Optionally, after the tank isolation valve is opened, the method further includes:
acquiring the atmospheric pressure at the current moment;
judging whether the oil tank pressure is equal to the atmospheric pressure;
and if the valve is equal to the valve, controlling the oil tank isolation valve to be closed.
Optionally, after the controlling the tank isolation valve to close, the method further includes:
under the condition that an engine works, controlling a carbon tank electromagnetic valve to be opened, and acquiring the electromagnetic valve opening of the carbon tank electromagnetic valve and the pressure of an intake manifold;
calculating the desorbed fuel vapor amount of the carbon tank according to the opening of the electromagnetic valve and the pressure of the air inlet manifold;
judging whether the desorbed fuel steam amount is larger than the preset adsorption amount or not;
if yes, the electromagnetic valve of the carbon tank is controlled to be closed.
Optionally, the calculating the desorbed fuel vapor amount of the canister according to the opening of the electromagnetic valve and the intake manifold pressure includes:
establishing a carbon tank desorption flow expression by utilizing the pressure of the intake manifold and the opening of the electromagnetic valve;
and calculating the desorbed fuel steam quantity according to the carbon tank desorption flow expression and a preset fuel steam control parameter.
Optionally, the calculating the initial value of the fuel vapor amount in the fuel tank according to the ideal gas equation includes:
calculating an initial value of fuel vapor in the fuel tank according to an ideal gas equation: m is m 0 ＝P 0 V 0 /RT 0 Wherein m is 0 Is the initial value of the fuel vapor quantity in the fuel tank, P 0 For initial value of tank pressure, V 0 For initial fuel volume, T 0 The initial value of the oil tank temperature is that R is the gas constant.
Optionally, the constructing an estimation equation of the fuel vapor amount in the fuel tank according to the ideal gas equation includes:
deriving the ideal gas equation to obtain the estimation equation:wherein (1)>Is the derivative of the initial value of the tank pressure, +.>Is the derivative of the initial value of the fuel volume, +.>Is the derivative of the initial value of the tank temperature,is the derivative of the initial value of the fuel vapor quantity in the fuel tank, P 1 For the current tank pressure value, V 1 T is the current fuel volume value 1 Is the current tank temperature value.
Optionally, the calculating the current fuel vapor amount in the fuel tank by using the initial value of the fuel vapor amount and the estimation equation includes:
and calculating the current fuel vapor amount in the fuel tank by using the initial value of the fuel vapor amount and the estimation equation:wherein m is vapor Is the current fuel vapor quantity in the fuel tank.
According to another aspect of the present invention, there is provided a regulation system for fuel vapor in a fuel tank of a hybrid vehicle, the regulation system comprising:
the device comprises a control unit, an oil tank pressure sensor, an oil tank temperature sensor, an oil level sensor, an oil tank isolation valve and a carbon tank electromagnetic valve;
the oil tank pressure sensor, the oil tank temperature sensor, the oil level sensor, the oil tank isolation valve and the carbon tank electromagnetic valve are respectively connected with the control unit;
the oil tank pressure sensor is arranged at the top of the oil tank and close to the oil tank liquid injection port; the oil tank pressure sensor is used for acquiring oil tank pressure;
the oil tank temperature sensor is arranged at the top of the oil tank and close to the oil tank liquid injection port; the oil tank temperature sensor is used for acquiring the oil tank temperature;
the oil level sensor is arranged at the bottom of the oil tank; the oil level sensor is used for acquiring the volume of fuel in the oil tank;
the control unit is used for calculating the current fuel steam quantity in the fuel tank according to the fuel tank pressure, the fuel tank temperature and the fuel volume, judging whether the current fuel steam quantity in the fuel tank reaches the preset adsorption quantity of the carbon tank, and controlling the opening of the fuel tank isolation valve when the current fuel steam quantity in the fuel tank reaches the preset adsorption quantity so that the current fuel steam in the fuel tank enters the carbon tank.
According to another aspect of the invention, an engine system is provided, and the engine system comprises the fuel vapor regulating system in the fuel tank, the activated carbon tank and the engine.
According to the method, the system and the engine system for adjusting the fuel vapor in the fuel tank of the hybrid electric vehicle, provided by the embodiment of the invention, the current fuel vapor amount in the fuel tank is calculated according to the fuel tank parameters by acquiring the fuel tank parameters at the current moment; judging whether the current fuel steam quantity reaches the preset adsorption quantity of the carbon tank or not; and if the current fuel vapor quantity reaches the preset adsorption quantity, controlling the opening of the fuel tank isolation valve so that the current fuel vapor in the fuel tank enters the carbon tank. According to the technical scheme provided by the embodiment of the invention, the current fuel vapor quantity in the fuel tank is calculated through the fuel tank parameters, and before the current fuel vapor quantity in the fuel tank exceeds the preset maximum adsorption quantity of the carbon tank, the fuel tank isolation valve is opened, so that the fuel vapor enters the carbon tank and is completely adsorbed by the carbon tank, the fuel vapor is effectively prevented from escaping and polluting the environment caused by overload of the carbon tank, and the environmental protection performance of the vehicle is improved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for regulating fuel vapor in a fuel tank of a hybrid vehicle according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for regulating fuel vapor in a fuel tank of a hybrid vehicle according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for regulating fuel vapor in a fuel tank of a hybrid vehicle according to an embodiment of the present invention;
FIG. 4 is a flowchart of a method for regulating fuel vapor in a fuel tank of a hybrid vehicle according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a fuel vapor regulating system in a fuel tank of a hybrid vehicle according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a flowchart of a method for adjusting fuel vapor in a fuel tank of a hybrid vehicle according to an embodiment of the present invention, where the method may be performed by a fuel vapor adjusting system in the fuel tank, and the fuel vapor adjusting system in the fuel tank may be implemented in hardware and/or software. Referring to fig. 1, the method includes:
s110, acquiring the parameters of the oil tank at the current moment.
Wherein the fuel tank parameters include at least fuel tank pressure, fuel tank temperature, and fuel volume within the fuel tank;
specifically, the tank parameters are acquired by a sensor, for example, the tank pressure is acquired by a tank pressure sensor, the tank temperature is acquired by a tank temperature sensor, and the fuel volume within the tank is acquired by a fuel level sensor.
S120, calculating the current fuel steam quantity in the fuel tank according to the fuel tank parameters.
Specifically, the initial fuel vapor amount in the fuel tank is calculated according to the fuel tank pressure, the fuel tank temperature and the fuel volume in the fuel tank, and the current fuel vapor amount in the fuel tank is updated and calculated in real time by combining the fuel tank pressure, the fuel tank temperature and the fuel volume on the basis of the initial fuel vapor amount.
S130, judging whether the current fuel steam quantity reaches the preset adsorption quantity of the carbon tank.
Wherein, the preset adsorption capacity can be preset, and the embodiment of the invention uses the maximum adsorption capacity m of the activated carbon tank Max As a preset adsorption amount.
Specifically, the current fuel vapor amount in the fuel tank is compared with the preset adsorption amount of the carbon tank, and whether the current fuel vapor amount in the fuel tank reaches the preset adsorption amount of the carbon tank is judged. When the current fuel vapor quantity in the fuel tank exceeds 90% m Max Later, or when the current fuel vapor level in the tank exceeds 85% m Max And when the fuel tank isolation valve is opened, fuel steam in the fuel tank enters the carbon tank and is adsorbed by the carbon tank.
And S140, if the current fuel steam quantity reaches the preset adsorption quantity, controlling the opening of the oil tank isolation valve so that the current fuel steam in the oil tank enters the carbon tank.
Specifically, when the current fuel steam quantity reaches the preset adsorption quantity, the oil tank isolation valve is controlled to be opened, so that the current fuel steam in the oil tank enters the carbon tank and is completely adsorbed by the carbon tank, and the fuel steam caused by supersaturation of the carbon tank can be effectively prevented from escaping and polluting the environment.
According to the technical scheme provided by the embodiment of the invention, the current fuel vapor quantity in the fuel tank is calculated through the fuel tank parameters, and before the current fuel vapor quantity in the fuel tank exceeds the preset maximum adsorption quantity of the carbon tank, the fuel tank isolation valve is opened, so that the fuel vapor enters the carbon tank and is completely adsorbed by the carbon tank, the fuel vapor is effectively prevented from escaping and polluting the environment caused by overload of the carbon tank, and the environmental protection performance of the vehicle is improved.
Fig. 2 is a flowchart of another method for adjusting fuel vapor in a fuel tank of a hybrid vehicle according to an embodiment of the present invention, where the foregoing embodiment is further refined based on the foregoing embodiment. Referring to fig. 2, S120 specifically includes:
s210, calculating an initial value of fuel vapor quantity in the fuel tank according to an ideal gas equation.
Specifically, the ideal gas equation is pv=mrt, and the initial value of the fuel vapor amount in the fuel tank is calculated according to the ideal gas equation: m is m 0 ＝P 0 V 0 /RT 0 Wherein m is 0 Is the initial value of fuel vapor quantity in the fuel tank, P 0 For initial value of tank pressure, V 0 For initial fuel volume, T 0 The initial value of the oil tank temperature is that R is the gas constant.
S220, constructing an estimation equation of the fuel vapor quantity in the fuel tank according to the ideal gas equation.
The ideal gas equation is pv=mrt, and the ideal gas equation is derived to obtain an estimation equation of the fuel vapor quantity in the fuel tank.
Specifically, the estimation equation for the fuel vapor amount in the fuel tank obtained by deriving the ideal gas equation is:wherein, wherein->Is the derivative of the initial value of the tank pressure, +.>Is the derivative of the initial value of the fuel volume, +.>Is the derivative of the initial value of the oil tank temperature, +.>Is the derivative of the initial value of the fuel vapor quantity in the fuel tank, P 1 For the current tank pressure value, V 1 T is the current fuel volume value 1 Is the current tank temperature value.
S230, calculating the current fuel vapor amount in the fuel tank by using the initial value of the fuel vapor amount and an estimation equation.
Specifically, the current fuel vapor amount in the fuel tank is calculated by using the initial value of the fuel vapor amount and an estimation equation, and the estimation equation is based on the integral principleSubstituting the parameters into an estimation equation, and solving m in the estimation equation to obtain the following formula, so as to calculate the current fuel vapor quantity in the fuel tank according to the following formula.
Wherein m is vapor Is the current fuel vapor quantity in the fuel tank.
Fig. 3 is a flowchart of another method for adjusting fuel vapor in a fuel tank of a hybrid vehicle according to an embodiment of the present invention, where the foregoing embodiment is further refined based on the foregoing embodiment. Referring to fig. 3, after S140, further comprising:
s310, acquiring the atmospheric pressure at the current moment.
S320, judging whether the oil tank pressure is equal to the atmospheric pressure.
And S330, if the valve is equal to the valve, controlling the oil tank isolation valve to be closed.
Specifically, whether the oil tank pressure is close to the atmospheric pressure or not is judged, and when the oil tank pressure is close to the atmospheric pressure, the oil tank isolation valve is controlled to be closed, so that the oil tank pressure is in a safe pressure range, safety accidents caused by too high oil tank pressure can be effectively prevented, and the safety of a vehicle is improved.
Fig. 4 is a flowchart of a method for adjusting fuel vapor in a fuel tank of a hybrid vehicle according to an embodiment of the present invention, where the foregoing embodiment is further refined based on the foregoing embodiment. Referring to fig. 4, after S330, further including:
s410, under the condition that the engine works, the solenoid valve of the carbon tank is controlled to be opened, and the solenoid valve opening degree of the solenoid valve of the carbon tank and the pressure of the air inlet manifold are obtained.
Specifically, because the fuel vapor in the fuel tank needs to be adsorbed through the carbon tank, then under the condition that the engine works, the electromagnetic valve of the carbon tank is controlled to be opened by utilizing the negative pressure of the air inlet pipe, the adsorbed fuel vapor in the carbon tank is desorbed and enters the engine through the air inlet pipe to be combusted, and therefore evaporation emission is reduced.
S420, calculating the desorbed fuel vapor quantity of the carbon tank according to the opening degree of the electromagnetic valve and the pressure of the air inlet manifold.
Specifically, a corresponding relation table between the carbon canister desorption flow and the intake manifold pressure and the electromagnetic valve opening can be obtained in advance through a test, and after the electromagnetic valve opening and the intake manifold pressure of the carbon canister electromagnetic valve are obtained, the corresponding relation table of the electromagnetic valve opening and the intake manifold pressure can be inquired to determine the desorbed fuel vapor quantity of the carbon canister.
Optionally, S420, calculating a desorbed fuel vapor amount of the canister according to the opening of the solenoid valve and the intake manifold pressure, specifically including:
establishing a carbon tank desorption flow expression by using the pressure of the intake manifold and the opening of the electromagnetic valve;
specifically, the canister desorption flow expression is m flow ＝f(P intake Duty), where m flow Carbon canister desorption flow, P intake The intake manifold pressure is the Duty, which is the solenoid valve opening.
And calculating the desorbed fuel steam quantity according to the carbon tank desorption flow expression and preset fuel steam control parameters.
Specifically, the desorbed fuel vapor amount is calculated using the following formula;
m purge ＝k∫m flow dt, wherein k is a preset fuel vapor control parameter.
S430, judging whether the desorbed fuel vapor amount is larger than a preset adsorption amount.
Specifically, after the desorbed fuel vapor amount of the carbon tank is obtained, comparing the desorbed fuel vapor amount with a preset adsorption amount, judging whether the desorbed fuel vapor amount is larger than the preset adsorption amount, if the desorbed fuel vapor amount does not exceed the current fuel vapor amount (the preset adsorption amount) in the carbon tank, indicating that the fuel vapor in the carbon tank is not desorbed completely after the engine stops working, recording the fuel vapor amount at the moment of stopping the engine, storing the fuel vapor amount in a nonvolatile memory of a controller, and when the engine works again, re-opening the electromagnetic valve of the carbon tank, and continuously accumulating the desorbed fuel vapor amount.
If the desorbed fuel vapor quantity exceeds the current fuel vapor quantity (preset adsorption quantity) in the carbon tank, the fuel vapor in the carbon tank is completely desorbed to the engine for combustion, a solenoid valve of the carbon tank is closed, the desorption process is stopped, and the fuel vapor quantity is reset to 0.
S440, if yes, controlling the electromagnetic valve of the carbon tank to be closed.
Specifically, if the determination result shows that the desorbed fuel vapor amount is greater than the preset adsorption amount, the fact that the fuel vapor in the carbon tank is desorbed to the engine for combustion is indicated, and at the moment, the electromagnetic valve of the carbon tank needs to be controlled to be closed, so that the fuel vapor is prevented from escaping and polluting the environment due to overload of the carbon tank, and the environmental protection performance of the vehicle is improved.
Fig. 5 is a schematic structural diagram of a system for adjusting fuel vapor in a fuel tank of a hybrid vehicle according to an embodiment of the present invention, where the system includes: a control unit 510, a tank pressure sensor 520, a tank temperature sensor 530, a fuel level sensor 540, a tank isolation valve 550, and a canister solenoid valve 560;
the tank pressure sensor 520, the tank temperature sensor 530, the fuel level sensor 540, the tank isolation valve 550, and the canister solenoid valve 560 are respectively connected with the control unit 510;
the tank pressure sensor 520 is arranged at the top of the tank and close to the tank filling port; the tank pressure sensor 520 is used for acquiring the tank pressure;
the tank temperature sensor 530 is arranged at the top of the tank near the tank filling port; the tank temperature sensor 530 is used for acquiring the tank temperature;
the oil level sensor 540 is disposed at the bottom of the oil tank; the level sensor 540 is used to acquire the volume of fuel in the tank;
the control unit 510 is configured to calculate a current fuel vapor amount in the fuel tank according to the fuel tank pressure, the fuel tank temperature, and the fuel volume, determine whether the current fuel vapor amount in the fuel tank is greater than a preset adsorption amount of the carbon canister, and when the current fuel vapor amount in the fuel tank is greater than the preset adsorption amount, control the fuel tank isolation valve to open, so that the current fuel vapor in the fuel tank enters the carbon canister.
Optionally, the control unit 510 is further configured to calculate an initial value of the fuel vapor amount in the fuel tank according to an ideal gas equation;
constructing an estimation equation of the fuel vapor quantity in the fuel tank according to the ideal gas equation;
and calculating the current fuel vapor quantity in the fuel tank by using the initial value of the fuel vapor quantity and an estimation equation.
Optionally, after the tank isolation valve is opened, the control unit is further configured to obtain an atmospheric pressure at the current moment;
judging whether the pressure of the oil tank is equal to the atmospheric pressure;
and if the valve is equal to the valve, controlling the oil tank isolation valve to be closed.
Optionally, after controlling the tank isolation valve to be closed, the control unit is further configured to control the canister solenoid valve to be opened and obtain a solenoid valve opening of the canister solenoid valve and an intake manifold pressure under the condition that the engine works;
calculating the desorbed fuel steam quantity of the carbon tank according to the opening of the electromagnetic valve and the pressure of the air inlet manifold;
judging whether the desorbed fuel steam amount is larger than a preset adsorption amount or not;
if yes, the solenoid valve of the carbon tank is controlled to be closed.
The fuel vapor regulating system in the fuel tank provided by the embodiment of the invention can execute the fuel vapor regulating method in the fuel tank provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the executing method.
With continued reference to fig. 5, an embodiment of the present invention further provides an engine system, where the engine system includes the fuel vapor regulation system in the fuel tank provided by the embodiment of the present invention, and further includes a fuel tank 570, a charcoal canister 580, and an engine 590.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. The method for regulating the fuel vapor in the fuel tank of the hybrid vehicle is characterized by comprising the following steps of:
acquiring the oil tank parameters at the current moment, wherein the oil tank parameters at least comprise oil tank pressure, oil tank temperature and fuel volume in the oil tank;
calculating the current fuel steam quantity in the fuel tank according to the fuel tank parameters;
judging whether the current fuel steam quantity reaches the preset adsorption quantity of the carbon tank or not;
and if the current fuel steam quantity reaches the preset adsorption quantity, controlling an oil tank isolation valve to be opened, so that the current fuel steam in the oil tank enters the carbon tank.
2. The method of claim 1, wherein said calculating a current fuel vapor amount in the fuel tank based on said fuel tank parameters comprises:
calculating an initial value of fuel steam in the fuel tank according to an ideal gas equation;
constructing an estimation equation of the fuel vapor quantity in the fuel tank according to the ideal gas equation;
and calculating the current fuel vapor amount in the fuel tank by using the initial value of the fuel vapor amount and the estimation equation.
3. The method of claim 2, further comprising, after the tank isolation valve is opened:
acquiring the atmospheric pressure at the current moment;
judging whether the oil tank pressure is equal to the atmospheric pressure;
and if the valve is equal to the valve, controlling the oil tank isolation valve to be closed.
4. A method according to claim 3, further comprising, after said controlling said tank isolation valve to close:
under the condition that an engine works, controlling a carbon tank electromagnetic valve to be opened, and acquiring the electromagnetic valve opening of the carbon tank electromagnetic valve and the pressure of an intake manifold;
calculating the desorbed fuel vapor amount of the carbon tank according to the opening of the electromagnetic valve and the pressure of the air inlet manifold;
judging whether the desorbed fuel steam amount is larger than the preset adsorption amount or not;
if yes, the electromagnetic valve of the carbon tank is controlled to be closed.
5. The method of claim 4, wherein said calculating the desorbed fuel vapor amount from the canister based on the solenoid valve opening and the intake manifold pressure comprises:
establishing a carbon tank desorption flow expression by utilizing the pressure of the intake manifold and the opening of the electromagnetic valve;
and calculating the desorbed fuel steam quantity according to the carbon tank desorption flow expression and a preset fuel steam control parameter.
6. The method of claim 2, wherein said calculating an initial value of fuel vapor quantity in said fuel tank according to an ideal gas equation comprises:
calculating an initial value of fuel vapor in the fuel tank according to an ideal gas equation: m is m 0 ＝P 0 V 0 /RT 0 Wherein m is 0 Is the initial value of the fuel vapor quantity in the fuel tank, P 0 For initial value of tank pressure, V 0 For initial fuel volume, T 0 The initial value of the oil tank temperature is that R is the gas constant.
7. The method of claim 6, wherein said constructing an estimation equation for the amount of fuel vapor in said fuel tank based on said ideal gas equation comprises:
deriving the ideal gas equation to obtain the estimation equation:wherein (1)>Is the derivative of the initial value of the tank pressure, +.>Is the derivative of the initial value of the fuel volume, +.>Is the derivative of the initial value of the oil tank temperature, +.>Is the derivative of the initial value of the fuel vapor quantity in the fuel tank, P 1 For the current tank pressure value, V 1 T is the current fuel volume value 1 Is the current tank temperature value.
8. The method of claim 7, wherein said calculating a current fuel vapor amount in said fuel tank using said initial fuel vapor amount value and said estimation equation comprises:
and calculating the current fuel vapor amount in the fuel tank by using the initial value of the fuel vapor amount and the estimation equation:wherein m is vapor Is the current fuel vapor quantity in the fuel tank.
9. A system for regulating fuel vapor in a fuel tank of a hybrid vehicle, the system comprising:
the device comprises a control unit, an oil tank pressure sensor, an oil tank temperature sensor, an oil level sensor, an oil tank isolation valve and a carbon tank electromagnetic valve;
the oil tank pressure sensor, the oil tank temperature sensor, the oil level sensor, the oil tank isolation valve and the carbon tank electromagnetic valve are respectively connected with the control unit;
the oil tank pressure sensor is arranged at the top of the oil tank and close to the oil tank liquid injection port; the oil tank pressure sensor is used for acquiring oil tank pressure;
the oil tank temperature sensor is arranged at the top of the oil tank and close to the oil tank liquid injection port; the oil tank temperature sensor is used for acquiring the oil tank temperature;
the oil level sensor is arranged at the bottom of the oil tank; the oil level sensor is used for acquiring the volume of fuel in the oil tank;
the control unit is used for calculating the current fuel steam quantity in the fuel tank according to the fuel tank pressure, the fuel tank temperature and the fuel volume, judging whether the current fuel steam quantity in the fuel tank reaches the preset adsorption quantity of the carbon tank, and controlling the opening of the fuel tank isolation valve when the current fuel steam quantity in the fuel tank reaches the preset adsorption quantity so that the current fuel steam in the fuel tank enters the carbon tank.
10. An engine system, characterized in that the engine system comprises the fuel vapor regulating system in the fuel tank according to the above claim 9, and further comprises the fuel tank, the charcoal canister and the engine.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311491372.4A CN117536745A (en) | 2023-11-09 | 2023-11-09 | Method and system for adjusting fuel vapor in fuel tank of hybrid electric vehicle and engine system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311491372.4A CN117536745A (en) | 2023-11-09 | 2023-11-09 | Method and system for adjusting fuel vapor in fuel tank of hybrid electric vehicle and engine system |
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| CN117536745A true CN117536745A (en) | 2024-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311491372.4A Pending CN117536745A (en) | 2023-11-09 | 2023-11-09 | Method and system for adjusting fuel vapor in fuel tank of hybrid electric vehicle and engine system |
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| Country | Link |
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| CN (1) | CN117536745A (en) |
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2023
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