CN117021935A - Pressure relief and emission reduction system of oil tank and control method - Google Patents
Pressure relief and emission reduction system of oil tank and control method Download PDFInfo
- Publication number
- CN117021935A CN117021935A CN202311089404.8A CN202311089404A CN117021935A CN 117021935 A CN117021935 A CN 117021935A CN 202311089404 A CN202311089404 A CN 202311089404A CN 117021935 A CN117021935 A CN 117021935A
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- Prior art keywords
- pipeline
- tank
- carbon tank
- carbon
- switching device
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Links
- 238000000034 method Methods 0.000 title claims abstract description 55
- 230000009467 reduction Effects 0.000 title claims abstract description 45
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 219
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 218
- 239000000446 fuel Substances 0.000 claims abstract description 59
- 238000002955 isolation Methods 0.000 claims abstract description 40
- 239000002828 fuel tank Substances 0.000 claims abstract description 38
- 239000004215 Carbon black (E152) Substances 0.000 claims description 92
- 229930195733 hydrocarbon Natural products 0.000 claims description 92
- 150000002430 hydrocarbons Chemical class 0.000 claims description 92
- 238000001179 sorption measurement Methods 0.000 claims description 75
- 230000001276 controlling effect Effects 0.000 claims description 16
- 230000004044 response Effects 0.000 claims description 15
- 230000002596 correlated effect Effects 0.000 claims description 7
- 239000000945 filler Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 20
- 239000001257 hydrogen Substances 0.000 abstract description 20
- 230000008569 process Effects 0.000 abstract description 11
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 58
- 238000002485 combustion reaction Methods 0.000 description 24
- 238000003795 desorption Methods 0.000 description 23
- 239000000203 mixture Substances 0.000 description 7
- 229920006395 saturated elastomer Polymers 0.000 description 7
- 230000000875 corresponding effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- -1 carbon hydrogen Chemical class 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/035—Fuel tanks characterised by venting means
-
- 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
- F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
-
- 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
- F02M25/0872—Details of the fuel vapour pipes or conduits
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/035—Fuel tanks characterised by venting means
- B60K15/03504—Fuel tanks characterised by venting means adapted to avoid loss of fuel or fuel vapour, e.g. with vapour recovery systems
- B60K2015/03514—Fuel tanks characterised by venting means adapted to avoid loss of fuel or fuel vapour, e.g. with vapour recovery systems with vapor recovery means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/035—Fuel tanks characterised by venting means
- B60K2015/03523—Arrangements of the venting tube
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/035—Fuel tanks characterised by venting means
- B60K2015/03561—Venting means working at specific times
- B60K2015/03576—Venting during filling the reservoir
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/035—Fuel tanks characterised by venting means
- B60K2015/0358—Fuel tanks characterised by venting means the venting is actuated by specific signals or positions of particular parts
- B60K2015/03585—Fuel tanks characterised by venting means the venting is actuated by specific signals or positions of particular parts by gas pressure
-
- 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
- F02M2025/0845—Electromagnetic valves
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
The invention provides a pressure relief and emission reduction system of an oil tank and a control method thereof, and relates to the technical field of pressure relief control of an automobile fuel tank; the first pipeline is provided with an oil tank isolation valve and is communicated with the carbon tank and the oil tank; the second pipeline is provided with a carbon tank electromagnetic valve, and the second pipeline is communicated with the carbon tank and the engine; a stop valve is arranged on the third pipeline, and the third pipeline communicates the carbon tank with the outside atmosphere; the switching device is used for controlling the opening degree of the first pipeline and the opening and closing of the second pipeline and the third pipeline. Through the design of the pressure relief emission reduction system, high-pressure fuel vapor can be effectively adsorbed in the process of passing through the carbon tank, and environmental pollution caused by direct emission of carbon hydrogen to the atmosphere is avoided.
Description
Technical Field
The invention relates to the technical field of pressure relief control of an automobile fuel tank, in particular to a pressure relief and emission reduction system and a control method of a fuel tank.
Background
With the development of society to cope with global climate change, regulations formulated for automobile emissions are becoming stricter to achieve the requirements of carbon neutralization and carbon peak. The mixed gas generated by the traditional fuel automobile is absorbed after passing through the carbon tank, and the mixed gas stored in the carbon tank is desorbed into the engine for combustion along with the continuous operation of the engine. Meanwhile, the discharge regulation in China six has the requirement of refueling discharge, and hydrocarbon discharge in the refueling process of the fuel vehicle is monitored and managed.
Along with the development of new energy automobiles, the more the strong hybrid/plug-in hybrid electric automobile occupies market share, the high-pressure oil tank adopted by the plug-in hybrid electric automobile needs pressure relief treatment for preventing fuel reverse injection and fuel steam leakage in the oiling process, the pressure relief process generally directly adsorbs fuel steam with certain pressure in the oil tank through a carbon tank and then discharges the fuel steam to the atmosphere, a related device system faces the fuel steam with larger pressure and flow rate, saturated fuel steam cannot be completely adsorbed when passing through the carbon tank in a large flow, and hydrocarbon emission exceeds standard, so that environmental pollution can be caused.
Disclosure of Invention
The invention provides a pressure relief and emission reduction system of an oil tank and a control method thereof, which aim to solve the technical problem of how to prevent hydrocarbon mixed gas generated by the oil tank from being discharged to the atmosphere to cause environmental pollution.
The embodiment of the invention provides a pressure relief and emission reduction system of an oil tank, which comprises a carbon tank, wherein mixed gas is arranged in the carbon tank; the first pipeline is provided with an oil tank isolation valve and is communicated with the carbon tank and the oil tank; the second pipeline is provided with a carbon tank electromagnetic valve and is communicated with the carbon tank and the engine; a third pipeline provided with a stop valve, wherein the third pipeline communicates the carbon tank with the outside atmosphere; and the switching device is used for controlling the opening degree of the first pipeline and the opening and closing of the second pipeline and the third pipeline.
Further, the pressure relief and emission reduction system further comprises a fourth pipeline, a filter and a control valve are arranged in the fourth pipeline, and the external atmosphere can flow into the carbon tank through the fourth pipeline.
Further, the second pipeline comprises a first branch and a second branch, the first branch and the second branch are respectively communicated with the carbon tank and the engine, and a venturi tube is installed in the second branch.
Further, the fuel tank is provided with a fuel filling pipe, and the pressure relief and emission reduction system further comprises a return pipe, wherein the return pipe is used for communicating the fuel filling pipe with the first pipeline.
The embodiment of the invention provides a control method for oil tank pressure relief, which is suitable for the pressure relief and emission reduction system, and comprises the steps of calculating and obtaining hydrocarbon adsorption quantity in a carbon tank by an electronic control unit; confirming the state of the carbon tank based on the hydrocarbon adsorption quantity, wherein the hydrocarbon adsorption quantity is zero, confirming that the carbon tank is in a first state, wherein the hydrocarbon adsorption quantity is greater than zero, and confirming that the carbon tank is in a second state; transmitting a first control instruction to the switching device in the first state, wherein the switching device responds to the first control instruction to control the first pipeline, the second pipeline and the third pipeline to be opened and closed; and in the second state, a second control instruction is sent to the switching device, and the switching device responds to the second control instruction to control the first pipeline, the third pipeline and the second pipeline to be opened and the second pipeline to be closed.
Further, the sending, by the switching device, a second control instruction to the switching device in the second state, and controlling, by the switching device, the first pipe and the third pipe to be opened and the second pipe to be closed in response to the second control instruction includes: and sending a second control instruction to the switching device in the second state, wherein the hydrocarbon adsorption quantity duty ratio is positively correlated with the opening degree of the oil tank isolation valve controlled by the switching device in response to the second control instruction.
Further, the pressure relief and emission reduction system also comprises a pressure sensor; the step of calculating and obtaining the hydrocarbon adsorption quantity in the carbon tank by the electronic control unit comprises the following steps: the electronic control unit calculates and obtains the hydrocarbon adsorption quantity in the carbon tank, and the pressure sensor obtains the pressure of the fuel vapor in the fuel tank; and sending a second control instruction to the switching device in the second state, wherein the switching device responding to the second control instruction to control the first pipeline and the third pipeline to be opened and the second pipeline to be closed comprises the following steps: sending a second control instruction to the switching device in the second state, wherein the hydrocarbon adsorption quantity duty ratio is positively correlated with the opening degree of the fuel tank isolation valve controlled by the switching device in response to the second control instruction under the condition that the pressure of the fuel vapor is unchanged; and under the condition that the hydrocarbon adsorption quantity is unchanged, the pressure of the fuel vapor is inversely related to the opening degree of the oil tank isolation valve controlled by the switching device in response to the second control instruction.
Further, the calculating and obtaining the hydrocarbon adsorption amount in the carbon tank by the electronic control unit comprises the following steps: acquiring the opening degree and the opening duration of the carbon tank electromagnetic valve by a control system; and calculating and acquiring the hydrocarbon adsorption quantity in the carbon tank by the electronic control unit based on the opening degree and the opening duration of the electromagnetic valve of the carbon tank.
Further, the pressure relief and emission reduction system further comprises a carbon tank sensor, and the control system for acquiring the opening degree and the opening duration of the carbon tank electromagnetic valve comprises the following steps: acquiring the opening degree and the opening duration of the carbon tank electromagnetic valve by a control system, and acquiring the hydrocarbon concentration in the carbon tank before and after the carbon tank electromagnetic valve is opened by the carbon tank sensor; the calculating, by the electronic control unit, the hydrocarbon adsorption amount in the carbon tank based on the opening size and the opening duration of the carbon tank electromagnetic valve includes: and calculating and acquiring the hydrocarbon adsorption quantity in the carbon tank by the electronic control unit based on the opening degree and the opening duration of the carbon tank electromagnetic valve and the hydrocarbon concentration in the carbon tank before and after the carbon tank electromagnetic valve is opened.
Further, the pressure relief and emission reduction system further comprises a fourth pipeline, wherein a filter and a control valve are arranged in the fourth pipeline, and external atmosphere can flow into the carbon tank through the fourth pipeline; and sending a first control instruction to the switching device in the first state, wherein the switching device responding to the first control instruction to control the first pipeline and the second pipeline to be opened and the third pipeline to be closed comprises the following steps: and in the first state, a first control instruction is sent to the switching device, and the switching device responds to the first control instruction to control the first pipeline, the second pipeline to be opened, the fourth pipeline to be opened and the third pipeline to be closed.
The invention provides a pressure relief and emission reduction system of an oil tank, which comprises a carbon tank, a first pipeline, a second pipeline, a third pipeline and a switching device, wherein mixed gas is arranged in the carbon tank; the first pipeline is provided with an oil tank isolation valve and is communicated with the carbon tank and the oil tank; the second pipeline is provided with a carbon tank electromagnetic valve, and the second pipeline is communicated with the carbon tank and the engine; a stop valve is arranged on the third pipeline, and the third pipeline communicates the carbon tank with the outside atmosphere; the switching device is used for controlling the opening degree of the first pipeline and the opening and closing of the second pipeline and the third pipeline. Through the design of first pipeline, second pipeline, third pipeline and auto-change over device, under the condition that the carbon tank does not have adsorption capacity, utilize the stop valve to close the third pipeline, avoid not being adsorbed hydrocarbon mixed gas inflow atmosphere and cause the pollution, open the second pipeline through the carbon tank solenoid valve, utilize the engine to carry out combustion desorption to the hydrocarbon mixed gas of oil tank exhaust, guarantee that exhaust gas has not pollution. Under the condition that the carbon tank has adsorption capacity, the third pipeline is opened by utilizing the stop valve, the second pipeline is closed by utilizing the electromagnetic valve of the carbon tank, the adsorbed carbon-hydrogen mixed gas is discharged to the atmosphere by utilizing the carbon tank, and meanwhile, the opening degree of the oil tank isolation valve is adjusted according to the adsorption capacity of the carbon tank, so that the flow of the carbon-hydrogen mixed gas in the oil tank passing through the first pipeline is effectively and reasonably controlled, the carbon-hydrogen mixed gas in the first pipeline is fully adsorbed by the carbon tank, and pollution caused by the fact that the unadsorbed carbon-hydrogen mixed gas flows into the atmosphere is avoided.
Drawings
Fig. 1 is a schematic structural diagram of a pressure relief and emission reduction system of an oil tank according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another pressure relief and emission reduction system of an oil tank according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another pressure relief and emission reduction system of an oil tank according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a method for controlling pressure relief of an oil tank according to an embodiment of the present invention;
fig. 5 is a flow chart of another method for controlling pressure relief of an oil tank according to an embodiment of the present invention;
fig. 6 is a flow chart of another method for controlling pressure relief of an oil tank according to an embodiment of the present invention;
fig. 7 is a flow chart of another method for controlling pressure relief of an oil tank according to an embodiment of the present invention;
fig. 8 is a flow chart of another method for controlling pressure relief of an oil tank according to an embodiment of the present invention;
fig. 9 is a flow chart of another method for controlling pressure relief of an oil tank according to an embodiment of the present invention;
FIG. 10 is a table showing the relationship between the opening of the tank isolation valve and the hydrocarbon adsorption capacity of the carbon tank and the fuel vapor pressure of the tank according to the embodiment of the invention.
Description of the reference numerals
100. The pressure relief and emission reduction system; 110. a carbon tank; 120. an oil tank; 121. a filler tube; 122. a return pipe; 130. an engine; 140. a first pipe; 141. an oil tank isolation valve; 150. a second pipe; 151. a carbon canister solenoid valve; 152. a first branch; 153. a second branch; 1531. a venturi tube; 1532. a high desorption pressure sensor; 160. a third conduit; 161. a stop valve; 170. a switching device; 180. a fourth conduit; 181. a filter; 182. and a control valve.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The individual features described in the specific embodiments can be combined in any suitable manner, without contradiction, for example by combination of different specific features, to form different embodiments and solutions. Various combinations of the specific features of the invention are not described in detail in order to avoid unnecessary repetition.
In the following description, references to the term "first/second/are merely to distinguish between different objects and do not indicate that the objects have the same or a relationship therebetween. It should be understood that references to orientations of "above", "below", "outside" and "inside" are all orientations in normal use, and "left" and "right" directions refer to left and right directions illustrated in the specific corresponding schematic drawings, and may or may not be left and right directions in normal use.
It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. The term "coupled," unless specifically indicated otherwise, includes both direct and indirect coupling.
In a specific embodiment, the pressure relief and emission reduction system is applicable to any type of automobile, for example, the pressure relief and emission reduction system can be applied to pressure relief and emission reduction of high-pressure steam of an oil tank in a fuel automobile; for example, the pressure relief and emission reduction system can be applied to pressure relief and emission reduction of high-pressure steam in an oil tank in a hybrid electric vehicle; for example, the pressure relief and emission reduction system can be applied to pressure relief and emission reduction of high-pressure steam in an oil tank in a plug-in hybrid electric vehicle; for example, the pressure relief and emission reduction system can be applied to pressure relief and emission reduction of high-pressure steam of an oil tank in an extended range hybrid automobile; the pressure relief and emission reduction system is also suitable for vehicles of a non-passing specification type, for example, the pressure relief and emission reduction system can be applied to pressure relief and emission reduction of high-pressure steam in an oil tank in a commercial bus with hybrid power; for example, the pressure relief and emission reduction system can be applied to pressure relief and emission reduction of high-pressure steam in an oil tank in a hybrid power household car; the control method is the control method of the pressure relief and emission reduction system. For convenience of explanation, the following will take the application of the pressure relief and emission reduction system to a household plug-in hybrid car as an example.
In some embodiments, as shown in FIG. 1, the pressure relief and emission abatement system 100 includes a canister 110, a first conduit 140, a second conduit 150, a third conduit 160, and a switching device 170. The carbon tank 110 has a mixed gas therein; the first pipe 140 is provided with an oil tank isolation valve 141, and the first pipe 140 is communicated with the carbon tank 110 and the oil tank 120; the second pipe 150 is provided with a carbon tank electromagnetic valve 151, and the second pipe 150 is communicated with the carbon tank 110 and the engine 130; the third pipe 160 is provided with a shut-off valve 161, and the third pipe 160 communicates the canister 110 with the outside atmosphere.
Specifically, the fuel in the fuel tank 120 has volatility, the fuel directly volatilizes into the atmosphere to cause air pollution, especially the high-pressure fuel tank, the fuel vapor pressure is larger, the specific vapor pressure value is not limited, for example, the fuel vapor pressure in part of the high-pressure fuel tank is between 60 and 70 kpa, and the fuel vapor pressure in part of the common fuel tank can reach about 35 kpa, so that a carbon tank 110 needs to be arranged between the engine 130 and the fuel tank 120 of the automobile, the fuel vapor in the fuel tank 120 enters the carbon tank 110 through a first pipeline 140 to be stored, and the direction indicated by the arrow is the direction of the mixed gas flow. The canister 10 may be understood as a device for collecting and reutilizing a hydrocarbon mixture, the specific structure of which may be determined according to actual requirements, the hydrocarbon mixture may be understood as fuel vapor, the proportion of the fuel vapor in the canister 110 may be obtained by detecting the concentration of hydrocarbon, and the mixture volatilized from the fuel tank 120 may be absorbed and stored by using a medium in the canister 110, such as activated carbon, and this process may be referred to as an adsorption process, and the mixture stored in the canister 110 may be transferred to a corresponding location for combustion, which may be referred to as a desorption process. For example, combustion desorption is performed by the engine 130. The gases are then exhausted through an exhaust pipe and an engine exhaust treatment device that includes a catalyst and a particulate trap.
In detail, the tank 120 is communicated with the carbon tank 110 through a first pipe 140, a tank isolation valve 141 is installed in the first pipe 140, the tank isolation valve 141 is an FTIV valve (Fuel Tank Isolation Valve), the opening degree of the tank isolation valve 141 can be controlled through PWM (Pulse width modulation ), so that the flow rate of high pressure steam flowing into the carbon tank 110 in the tank 120 can be controlled, and the opening degree of the tank isolation valve 141 will be described in a control method hereinafter, and only the structure will be described herein. The other end of the carbon tank 110 is also provided with at least two discharge channels, one of which is communicated with the engine 130 through a second pipeline 150, a carbon tank electromagnetic valve 151 is arranged in the second pipeline 150, when the engine 130 is started, the carbon tank electromagnetic valve 151 is opened, hydrocarbon mixed gas in the carbon tank 110 is released, flows into the engine 130 through the second pipeline 150, is combusted and desorbed through the engine 130, and is communicated with the atmosphere through a third pipeline 160, a stop valve 161 is arranged in the third pipeline 160, and the gas in the carbon tank 110 is discharged into the atmosphere through the third pipeline 160.
The specific operation is controlled by the switching device 170, the control system comprises an electronic control unit ECU, a whole vehicle control unit VCU and other related parts, the control system sends a control instruction to the switching device 170, and the switching device 170 controls the corresponding pipeline valve to be opened. Illustratively, the canister 110 has no adsorption capacity, i.e. in the case of saturation of the canister 110, the switching device 170 controls the tank isolation valve 141 in the first conduit 140 to open, the canister solenoid valve 151 in the second conduit 150 to open, and the stop valve 161 in the third conduit 160 to close, so that the hydrocarbon mixture in the fuel vapor generated by the fuel tank 120 flows into the canister 110 through the first conduit 140, and then flows into the engine 130 through the second conduit 150 for combustion desorption to depressurize the fuel tank 120. The canister 110 has adsorption capacity, the switching device 170 controls the tank isolation valve 141 in the first pipe 140 to be opened, the canister solenoid valve 151 in the second pipe 150 to be closed, and the shutoff valve 161 in the third pipe 160 to be opened, so that the hydrocarbon mixture in the fuel vapor generated from the fuel tank 120 flows into the canister 110 through the first pipe 140, the hydrocarbon mixture in the fuel vapor is adsorbed in the canister 110, and then the non-polluted gas is discharged to the outside through the third pipe 160.
Meanwhile, in some embodiments, in order to facilitate the smoothness of the filling of the fuel tank 120, the pressure relief and emission reduction system 100 further includes a return pipe 122, and both ends of the return pipe 122 are respectively connected to the filling pipe 121 and the first pipe 140 on the fuel tank 120, so that the pressure of the fuel tank 120 is in an equilibrium state with the outside, thereby ensuring the smoothness and stability of the filling process.
The invention provides a pressure relief and emission reduction system of an oil tank, which comprises a carbon tank, a first pipeline, a second pipeline, a third pipeline and a switching device, wherein mixed gas is arranged in the carbon tank; the first pipeline is provided with an oil tank isolation valve and is communicated with the carbon tank and the oil tank; the second pipeline is provided with a carbon tank electromagnetic valve, and the second pipeline is communicated with the carbon tank and the engine; a stop valve is arranged on the third pipeline, and the third pipeline communicates the carbon tank with the outside atmosphere; the switching device is used for controlling the opening degree of the first pipeline and the opening and closing of the second pipeline and the third pipeline. Through the design of first pipeline, second pipeline, third pipeline and auto-change over device, under the condition that the carbon tank does not have adsorption capacity, utilize the stop valve to close the third pipeline, avoid not being adsorbed hydrocarbon mixed gas inflow atmosphere and cause the pollution, open the second pipeline through the carbon tank solenoid valve, utilize the engine to carry out combustion desorption to the hydrocarbon mixed gas of oil tank exhaust, guarantee that exhaust gas has not pollution. Under the condition that the carbon tank has adsorption capacity, the third pipeline is opened by utilizing the stop valve, the second pipeline is closed by utilizing the electromagnetic valve of the carbon tank, the adsorbed carbon-hydrogen mixed gas is discharged to the atmosphere by utilizing the carbon tank, and meanwhile, the opening degree of the oil tank isolation valve is adjusted according to the adsorption capacity of the carbon tank, so that the flow of the carbon-hydrogen mixed gas in the oil tank passing through the first pipeline is effectively and reasonably controlled, the carbon-hydrogen mixed gas in the first pipeline is fully adsorbed by the carbon tank, and pollution caused by the fact that the unadsorbed carbon-hydrogen mixed gas flows into the atmosphere is avoided.
In some embodiments, as shown in FIG. 2, the pressure relief and emission abatement system 100 further includes a fourth conduit 180, a filter 181 and a control valve 182 are installed in the fourth conduit 180, and ambient atmosphere can be provided to flow into the canister 110 through the fourth conduit 180. Specifically, under the condition that the carbon canister 110 has no adsorption capacity, the carbon canister 110 cannot adsorb high-pressure fuel vapor in the fuel tank 120, combustion desorption is required to be performed on the high-pressure fuel vapor in the fuel tank 120 by using the engine 130, meanwhile, part of previously adsorbed fuel vapor in the carbon canister 110 can be released, combustion desorption is performed by using the engine 130, so that the subsequent carbon canister 110 has the capacity of adsorbing the fuel vapor, in order to better clean and release the fuel vapor adsorbed by the carbon canister 110, the pressure relief emission reduction system 100 further comprises a fourth pipeline 180, the fourth pipeline 180 can be directly communicated with the carbon canister 110, and can also be connected between a stop valve 161 of the third pipeline 160 and the carbon canister 110, the fourth pipeline 180 is provided with a filter 181 and a control valve 182, the filter 181 can be an ash filter, the control valve 182 can be a one-way valve so as to prevent the unreleased mixed gas from flowing out, the engine 130 works to generate negative pressure, the air enters the carbon canister 110 after passing through the ash filter and the one-way valve, the cleaned mixed gas enters the engine 151 to enter the electromagnetic valve 130 for combustion desorption after passing through the second pipeline 150, and enters the engine 151 to enter the electromagnetic valve for combustion desorption.
In some embodiments, as shown in fig. 3, the second conduit 150 includes a first branch 152 and a second branch 153, the first branch 152 and the second branch 153 communicating with the canister 110 and the engine 130, respectively, wherein a venturi 1531 is installed in the second branch 153. Specifically, in consideration of the starting condition of the supercharger, the high-pressure fuel vapor in the fuel tank 120 and the mixed gas in the canister 110 may directly enter the engine 130 through the canister solenoid valve 151 for combustion desorption, or may enter the engine 130 through the canister solenoid valve 34 by using the venturi 1531 for combustion desorption. Illustratively, when the supercharger is started, positive pressure is present in the intake of the engine 130, and a venturi 1531 and a high desorption pressure sensor 1532 are provided between the canister 110 and the engine 130. The specific flow is that the carbon tank electromagnetic valve 151 is opened, the high-pressure fuel vapor in the fuel tank 120 and the air enter the carbon tank 110 after passing through the filter 181 and the control valve 182, the carbon tank 110 is cleaned, the cleaned fuel vapor needs to pass through the carbon tank electromagnetic valve 151, the high-desorption pressure sensor 1532 and the venturi 1531 in sequence, finally enter the engine 130 for combustion desorption (as shown by the direction of the dotted arrow in fig. 3), and then pass through the exhaust pipe and the tail gas treatment device to discharge the gas. When the supercharger is not started, negative pressure is generated in an air inlet pipe of the engine 130, the specific flow is that the carbon tank electromagnetic valve 151 is opened, high-pressure fuel vapor in the oil tank 120 and air enter the carbon tank 110 after passing through the filter 181 and the control valve 182, the carbon tank 110 is cleaned, the cleaned fuel vapor is directly sucked into the engine 130 through the carbon tank electromagnetic valve 151 for combustion desorption (the direction shown by the solid arrow in fig. 3), and then the gas is discharged through the exhaust pipe and the tail gas treatment device.
The embodiment provides a control method for pressure relief of an oil tank, which is suitable for a pressure relief and emission reduction system as shown in any one of fig. 1 to 3. As shown in fig. 4, fig. 4 is a schematic flow chart of a control method for pressure relief of an oil tank according to an embodiment of the present invention, where the flow chart of the control method includes:
and step S100, calculating and obtaining the hydrocarbon adsorption quantity in the carbon tank by the electronic control unit.
Specifically, after the automobile control system obtains a request that the automobile needs to be refueled, the control system needs to determine the capability of the carbon tank to adsorb the hydrocarbon mixed gas in the fuel vapor at first, specifically, the hydrocarbon adsorption quantity in the carbon tank can be obtained through calculation of the electronic control unit, for example, the weight of the carbon tank to adsorb the hydrocarbon mixed gas is 100, the engine is started the previous time, the weight of the carbon tank to release the hydrocarbon mixed gas is 40 to perform combustion desorption of the engine, and therefore the weight of the carbon tank remaining to adsorb the hydrocarbon mixed gas is 40. Any mode capable of obtaining the hydrocarbon adsorption quantity in the carbon tank meets the requirement, and by way of example, the quantity of hydrocarbon mixed gas flowing into the engine for combustion through the second pipeline can be calculated through the opening degree of the electromagnetic valve of the carbon tank in the second pipeline and the opening time of the electromagnetic valve of the carbon tank in the previous time, so that the quantity of hydrocarbon mixed gas which can be adsorbed by the carbon tank at present is obtained, namely the hydrocarbon adsorption quantity; by way of example, the carbon tank sensor is arranged in the carbon tank, the carbon-hydrogen concentration in the carbon tank is obtained through the carbon tank sensor, and the quantity of the carbon tank capable of adsorbing the carbon-hydrogen mixed gas at present, namely the carbon-hydrogen adsorption quantity, is judged according to the carbon-hydrogen concentration.
And step 200, confirming that the carbon tank is in a state based on the hydrocarbon adsorption quantity, wherein the hydrocarbon adsorption quantity is zero, confirming that the carbon tank is in a first state, and confirming that the carbon tank is in a second state, wherein the hydrocarbon adsorption quantity is larger than zero.
Specifically, after the electronic control unit calculates and obtains the hydrocarbon adsorption quantity in the carbon tank, the control system judges the state of the carbon tank based on the hydrocarbon adsorption quantity, and the carbon tank is in a saturated state and cannot adsorb hydrocarbon mixed gas again, so that the hydrocarbon adsorption quantity of the carbon tank is considered to be zero, and the carbon tank is confirmed to be in a first state, namely the saturated state; when the carbon tank is not in a saturated state and can absorb some carbon-hydrogen mixed gas, the carbon-hydrogen adsorption quantity of the carbon tank is considered to be larger than zero, and the carbon tank is confirmed to be in a second state, namely not in the saturated state.
Step S300, a first control instruction is sent to a switching device in a first state, and the switching device responds to the first control instruction to control the first pipeline and the second pipeline to be opened and the third pipeline to be closed; and in the second state, a second control instruction is sent to the switching device, and the switching device responds to the second control instruction to control the first pipeline and the third pipeline to be opened and the second pipeline to be closed.
Specifically, when the control system judges that the carbon tank is in a first state, namely in a saturated state, the hydrocarbon mixed gas in the fuel vapor generated by the fuel tank cannot be adsorbed by the carbon tank, and cannot be directly discharged to the atmosphere at the moment, in order to protect the environment, the automobile control system should send an instruction for starting the engine, meanwhile, the control system sends a first control instruction, related parts such as a fuel tank isolation valve in a first pipeline and a carbon tank electromagnetic valve in a second pipeline in the switching device, a stop valve in a third pipeline and the like respond to the first control instruction, the fuel tank isolation valve in the first pipeline is opened, the carbon tank electromagnetic valve in the second pipeline is opened, and the stop valve in the third pipeline is closed, so that the hydrocarbon mixed gas in the fuel vapor generated by the fuel tank flows into the carbon tank through the first pipeline and then flows into the engine through the second pipeline for combustion desorption to release the fuel tank. Under the condition that the control system judges that the carbon tank is in a second state, namely in an unsaturated state, hydrocarbon mixed gas in fuel vapor generated by the fuel tank can be adsorbed by the carbon tank, the automobile control system sends a second control instruction, an oil tank isolation valve in a first pipeline in the switching device, a carbon tank electromagnetic valve in a second pipeline, a stop valve and other relevant parts in a third pipeline respond to the second control instruction, the oil tank isolation valve in the first pipeline is opened, the carbon tank electromagnetic valve in the second pipeline is closed, and the stop valve in the third pipeline is opened, so that the hydrocarbon mixed gas in the fuel vapor generated by the fuel tank flows into the carbon tank through the first pipeline, the hydrocarbon mixed gas is adsorbed in the carbon tank, and then the gas without pollution is discharged to the outside through the third pipeline.
In some embodiments, as shown in fig. 5, fig. 5 is a flowchart of another control method for tank pressure relief, where the control method is different from the control method provided in fig. 4 in that after step S200 is performed, step S310 or step S320 is selectively performed according to actual situations, and step S300 in fig. 4 includes:
step S310, a first control instruction is sent to the switching device in the first state, and the switching device responds to the first control instruction to control the first pipeline, the second pipeline and the third pipeline to be opened and closed.
The specific content is described in the foregoing step S300, and will not be described herein.
Step S320, a second control command is sent to the switching device in the second state, and the hydrocarbon adsorption quantity duty ratio is positively correlated with the opening degree of the tank isolation valve controlled by the switching device in response to the second control command.
Specifically, in the pressure relief process of the oil tank, the fact that the pressure of fuel vapor in the oil tank is too large and the adsorption capacity of the carbon tank is weak is considered, the carbon tank cannot effectively adsorb due to the impact of high-pressure hydrocarbon vapor, and further excessive or out-of-standard hydrocarbon emission is caused. Therefore, after confirming the adsorption capacity of the carbon tank, the control system sends a second control instruction to the switching device based on the adsorption capacity of the carbon tank, the larger the adsorption capacity of the carbon tank is, the stronger the adsorption capacity of the carbon tank is, the greater the opening degree of the oil tank isolation valve in the first pipeline in the switching device is in response to the second control instruction, so as to accelerate the carbon tank to adsorb hydrocarbon mixed gas, reduce the pressure release time of the oil tank, and the specific opening degree of the oil tank isolation valve is related to the adsorption capacity of the carbon hydrogen, and can be calibrated in advance according to practical situations, for example, please refer to fig. 10, and fig. 10 is a table of the relationship between the opening degree of the oil tank isolation valve, the adsorption capacity of the carbon tank and the fuel vapor pressure of the oil tank.
In some embodiments, as shown in fig. 6, fig. 6 is a flow chart of another control method for pressure relief of a fuel tank, where the control method is different from the control method provided in fig. 4, and step S100 in fig. 6 includes:
and step S110, the electronic control unit calculates and acquires the hydrocarbon adsorption quantity in the carbon tank, and the pressure sensor acquires the pressure of the fuel vapor in the fuel tank.
Specifically, the calculation of the hydrocarbon adsorption amount in the carbon canister by the electronic control unit has been described above, and will not be described here again. Further consider that the adsorption rate of carbon tank and the gas pressure in the oil tank are correlated, in order to improve pressure release efficiency, pressure release emission reduction system still includes pressure sensor, and pressure sensor is located the European oil tank, obtains the pressure of the internal combustion oil steam of oil tank through pressure sensor.
Step S300 in fig. 6 further includes step S310 and step S330, and step S310 has been described above, and will not be described here again.
Step S330, a second control instruction is sent to the switching device in a second state, and the hydrocarbon adsorption quantity duty ratio is positively correlated with the opening degree of the oil tank isolation valve controlled by the switching device in response to the second control instruction under the condition that the pressure of the fuel vapor is unchanged; under the condition that the hydrocarbon adsorption quantity is unchanged, the pressure of the fuel vapor is inversely related to the opening degree of the oil tank isolation valve controlled by the switching device in response to the second control instruction.
Specifically, considering that the fuel vapor pressure in the fuel tank and the adsorption capacity of the canister both affect the adsorption effect of the canister, the control system sends a second control instruction to the switching device based on the canister adsorption capacity and the fuel vapor pressure after confirming the adsorption capacity of the canister, and the switching device responds to the second control instruction. Under the condition that the pressure of the fuel vapor is unchanged, the larger the hydrocarbon adsorption quantity is, the larger the degree of controlling the opening of the oil tank isolation valve is in response to a second control instruction of the oil tank isolation valve in the first pipeline of the switching device, so that the speed of adsorbing hydrocarbon mixed gas by the carbon tank is increased, and the time of pressure relief of the oil tank is shortened. Under the condition that the hydrocarbon adsorption quantity is unchanged, the greater the pressure of the fuel vapor, the smaller the degree of controlling the opening of the oil tank isolation valve by responding to the second control instruction of the oil tank isolation valve in the first pipeline in the switching device, so as to avoid the condition that the flow speed is accelerated and the carbon tank cannot fully adsorb due to the pressure of the fuel vapor. The degree to which the tank isolation valve is opened is related to the hydrocarbon adsorption amount and the fuel vapor pressure, and may be calibrated in advance according to practical situations, for example, please refer to fig. 10, fig. 10 is a table showing the relationship between the opening degree of the tank isolation valve and the hydrocarbon adsorption amount of the canister and the fuel vapor pressure of the tank.
In some embodiments, as shown in fig. 7, fig. 7 is a flow chart of another control method for tank pressure relief, where the control method is different from the control method provided in fig. 4 in that step S100 in fig. 7 includes:
and step S120, acquiring the opening degree and the opening duration of the electromagnetic valve of the carbon tank by the control system.
And step S130, calculating and acquiring the hydrocarbon adsorption quantity in the carbon tank by the electronic control unit based on the opening degree and the opening duration of the electromagnetic valve of the carbon tank.
Specifically, after the automobile control system obtains a request that the automobile needs to be refueled, the control system needs to judge the capability of the carbon tank for adsorbing the hydrocarbon mixed gas in the fuel steam, obtains the opening degree of the electromagnetic valve of the carbon tank in the second pipeline and the opening time of the electromagnetic valve of the carbon tank in the previous time through the control system, and calculates the quantity of the hydrocarbon mixed gas flowing into the engine for combustion through the second pipeline, so that the quantity of the hydrocarbon mixed gas which can be adsorbed by the carbon tank at present is obtained, namely the hydrocarbon adsorption quantity.
In some embodiments, as shown in fig. 8, fig. 8 is a flow chart of another control method for pressure relief of the oil tank, where the control method is different from the control method provided in fig. 7 in that step S120 in fig. 8 includes:
step S121, the opening degree and the opening duration of the carbon tank electromagnetic valve are obtained by the control system, and the hydrocarbon concentration in the carbon tank before and after the carbon tank electromagnetic valve is opened is obtained by the carbon tank sensor.
Step S130 in fig. 8 further includes: step S131, based on the opening degree and the opening duration of the carbon tank electromagnetic valve and the carbon-hydrogen concentration in the carbon tank before and after the carbon tank electromagnetic valve is opened, the carbon-hydrogen adsorption quantity in the carbon tank is calculated and acquired by the electronic control unit.
Specifically, in order to further accurately obtain the hydrocarbon adsorption quantity in the carbon tank, the opening degree and the opening duration of the carbon tank electromagnetic valve are calculated by combining the hydrocarbon concentration in the carbon tank before and after the carbon tank electromagnetic valve is opened, and the carbon tank electromagnetic valve is not opened before the previous engine starts combustion is obtained through the carbon tank sensor, namely the hydrocarbon concentration in the carbon tank when the engine is not combusted and desorbed yet; and after the previous engine starting combustion is obtained through the carbon tank sensor, closing the carbon tank electromagnetic valve, namely, the carbon-hydrogen concentration in the carbon tank after the engine combustion desorption, and calculating the engine combustion desorption quantity according to the difference of the carbon-hydrogen concentration in the carbon tank before and after the carbon tank and the opening degree and the opening duration of the carbon tank electromagnetic valve, so as to obtain the adsorbable quantity of the carbon tank.
In some embodiments, as shown in fig. 9, fig. 9 is a flow chart of another control method for tank pressure relief, where the control method is different from the control method provided in fig. 4 in that step S300 in fig. 9 includes:
step S340, a first control command is sent to the switching device in the first state, and the switching device controls the first pipeline, the second pipeline to be opened, the fourth pipeline to be opened, and the third pipeline to be closed in response to the first control command.
Specifically, better desorption to the carbon tank, and then improve the adsorption capacity of carbon tank, need wash the release to the hydrocarbon mixed gas that the carbon tank has adsorbed, pressure release emission reduction system still includes the fourth pipeline, install filter and control valve in the fourth pipeline, external atmosphere can be for flowing into the carbon tank through the fourth pipeline, control system judges that the carbon tank is in the first state, under the saturated condition, hydrocarbon mixed gas in the fuel steam that the oil tank produced can't be adsorbed by the carbon tank, automobile control system should send the instruction of starting the engine, send first control command to control system under the first state, the control valve of the carbon tank in the first pipeline in the auto-change over device, the control valve of the third pipeline etc. relevant spare parts responds first control command, the oil tank isolation valve in the first pipeline is opened, the carbon tank solenoid valve in the second pipeline is opened, the stop valve in the third pipeline is closed, the control valve of the fourth pipeline is opened, thereby make the hydrocarbon mixed gas in the steam that the oil tank produced flow into the carbon tank through first pipeline, then the second pipeline carries out the desorption to the engine, the carbon tank is washd through the desorption to the fuel tank through the second pipeline, the engine is carried out, the carbon tank is washd to the carbon gas through the second pipeline after the combustion is flowed into to the fourth pipeline.
And step 350, sending a second control instruction to the control system in a second state, and controlling the first pipeline and the third pipeline to be opened and the second pipeline to be closed by the switching device in response to the second control instruction.
The specific content is described in the foregoing step S300, and will not be described herein.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. The utility model provides a pressure release emission reduction system of oil tank which characterized in that includes:
a carbon tank having a mixed gas therein;
the first pipeline is provided with an oil tank isolation valve and is communicated with the carbon tank and the oil tank;
the second pipeline is provided with a carbon tank electromagnetic valve and is communicated with the carbon tank and the engine;
a third pipeline provided with a stop valve, wherein the third pipeline communicates the carbon tank with the outside atmosphere;
and the switching device is used for controlling the opening degree of the first pipeline and the opening and closing of the second pipeline and the third pipeline.
2. The pressure and emission abatement system of claim 1, further comprising a fourth conduit having a filter and control valve mounted therein, the ambient atmosphere being capable of flowing into the canister through the fourth conduit.
3. The pressure relief and emission reduction system according to claim 1 or 2, wherein the second conduit comprises a first branch and a second branch, both communicating with the canister and the engine, respectively, wherein a venturi is installed in the second branch.
4. The pressure relief and emission abatement system of claim 1, wherein the fuel tank has a filler neck, the pressure relief and emission abatement system further comprising a return line that communicates the filler neck with the first conduit.
5. A control method for pressure relief of an oil tank, wherein the control method is used for controlling the pressure relief and emission reduction system according to any one of claims 1 to 4, and the control method comprises:
the electronic control unit calculates and obtains the hydrocarbon adsorption quantity in the carbon tank;
confirming the state of the carbon tank based on the hydrocarbon adsorption quantity, wherein the hydrocarbon adsorption quantity is zero, confirming that the carbon tank is in a first state, wherein the hydrocarbon adsorption quantity is greater than zero, and confirming that the carbon tank is in a second state;
transmitting a first control instruction to the switching device in the first state, wherein the switching device responds to the first control instruction to control the first pipeline, the second pipeline and the third pipeline to be opened and closed; and in the second state, a second control instruction is sent to the switching device, and the switching device responds to the second control instruction to control the first pipeline, the third pipeline and the second pipeline to be opened and the second pipeline to be closed.
6. The control method according to claim 5, wherein the sending a second control instruction to the switching device in the second state, the switching device controlling the first and third pipes to be opened and the second pipe to be closed in response to the second control instruction includes:
and sending a second control instruction to the switching device in the second state, wherein the hydrocarbon adsorption quantity duty ratio is positively correlated with the opening degree of the oil tank isolation valve controlled by the switching device in response to the second control instruction.
7. The control method of claim 5, wherein the pressure relief and abatement system further comprises a pressure sensor;
the step of calculating and obtaining the hydrocarbon adsorption quantity in the carbon tank by the electronic control unit comprises the following steps:
the electronic control unit calculates and obtains the hydrocarbon adsorption quantity in the carbon tank, and the pressure sensor obtains the pressure of the fuel vapor in the fuel tank;
and sending a second control instruction to the switching device in the second state, wherein the switching device responding to the second control instruction to control the first pipeline and the third pipeline to be opened and the second pipeline to be closed comprises the following steps:
sending a second control instruction to the switching device in the second state, wherein the hydrocarbon adsorption quantity duty ratio is positively correlated with the opening degree of the fuel tank isolation valve controlled by the switching device in response to the second control instruction under the condition that the pressure of the fuel vapor is unchanged; and under the condition that the hydrocarbon adsorption quantity is unchanged, the pressure of the fuel vapor is inversely related to the opening degree of the oil tank isolation valve controlled by the switching device in response to the second control instruction.
8. The control method according to any one of claims 5 to 7, characterized in that the calculation of the hydrocarbon adsorption amount in the canister by the electronic control unit includes:
acquiring the opening degree and the opening duration of the carbon tank electromagnetic valve by a control system;
and calculating and acquiring the hydrocarbon adsorption quantity in the carbon tank by the electronic control unit based on the opening degree and the opening duration of the electromagnetic valve of the carbon tank.
9. The control method of claim 8, wherein the pressure relief and emission reduction system further comprises a canister sensor, and wherein the obtaining, by the control system, the opening size and the opening duration of the canister solenoid valve comprises:
acquiring the opening degree and the opening duration of the carbon tank electromagnetic valve by a control system, and acquiring the hydrocarbon concentration in the carbon tank before and after the carbon tank electromagnetic valve is opened by the carbon tank sensor;
the calculating, by the electronic control unit, the hydrocarbon adsorption amount in the carbon tank based on the opening size and the opening duration of the carbon tank electromagnetic valve includes:
and calculating and acquiring the hydrocarbon adsorption quantity in the carbon tank by the electronic control unit based on the opening degree and the opening duration of the carbon tank electromagnetic valve and the hydrocarbon concentration in the carbon tank before and after the carbon tank electromagnetic valve is opened.
10. The control method according to claim 5, wherein the pressure relief and emission reduction system further comprises a fourth pipe in which a filter and a control valve are installed, and external atmosphere can be given to flow into the carbon tank through the fourth pipe; and sending a first control instruction to the switching device in the first state, wherein the switching device responding to the first control instruction to control the first pipeline and the second pipeline to be opened and the third pipeline to be closed comprises the following steps:
and in the first state, a first control instruction is sent to the switching device, and the switching device responds to the first control instruction to control the first pipeline, the second pipeline to be opened, the fourth pipeline to be opened and the third pipeline to be closed.
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| CN202311089404.8A CN117021935A (en) | 2023-08-25 | 2023-08-25 | Pressure relief and emission reduction system of oil tank and control method |
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| CN202311089404.8A CN117021935A (en) | 2023-08-25 | 2023-08-25 | Pressure relief and emission reduction system of oil tank and control method |
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