WO2022161859A1 - Dispositif et procede de purge d'un flux de gaz charge en vapeurs d'hydrocarbures - Google Patents
Dispositif et procede de purge d'un flux de gaz charge en vapeurs d'hydrocarbures Download PDFInfo
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- WO2022161859A1 WO2022161859A1 PCT/EP2022/051296 EP2022051296W WO2022161859A1 WO 2022161859 A1 WO2022161859 A1 WO 2022161859A1 EP 2022051296 W EP2022051296 W EP 2022051296W WO 2022161859 A1 WO2022161859 A1 WO 2022161859A1
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- WIPO (PCT)
- Prior art keywords
- temperature
- pump
- flow
- gas flow
- gas
- Prior art date
Links
- 238000010926 purge Methods 0.000 title claims abstract description 94
- 229930195733 hydrocarbon Natural products 0.000 title claims description 40
- 150000002430 hydrocarbons Chemical class 0.000 title claims description 40
- 238000000034 method Methods 0.000 title claims description 12
- 239000004215 Carbon black (E152) Substances 0.000 title description 34
- 239000000446 fuel Substances 0.000 claims abstract description 43
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 31
- 230000006835 compression Effects 0.000 claims abstract description 21
- 238000007906 compression Methods 0.000 claims abstract description 21
- 238000002485 combustion reaction Methods 0.000 claims abstract description 18
- 230000002745 absorbent Effects 0.000 claims description 32
- 239000002250 absorbent Substances 0.000 claims description 32
- 238000011144 upstream manufacturing Methods 0.000 claims description 27
- 238000005259 measurement Methods 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 238000009530 blood pressure measurement Methods 0.000 claims description 5
- 239000001273 butane Substances 0.000 claims description 5
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims description 5
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 3
- 238000004590 computer program Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 142
- 230000004044 response Effects 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 206010063493 Premature ageing Diseases 0.000 description 2
- 208000032038 Premature aging Diseases 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 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
- 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
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
- F02D41/0032—Controlling the purging of the canister as a function of the engine operating conditions
- F02D41/004—Control of the valve or purge actuator, e.g. duty cycle, closed loop control of position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
- F02D41/0042—Controlling the combustible mixture as a function of the canister purging, e.g. control of injected fuel to compensate for deviation of air fuel ratio when purging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
- F02D41/0045—Estimating, calculating or determining the purging rate, amount, flow or concentration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0606—Fuel temperature
-
- 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
Definitions
- the invention relates to the treatment of hydrocarbon vapors in a motor vehicle and more particularly to a device for purging hydrocarbon vapors in a heat engine of a motor vehicle.
- the invention finds its application in particular in hybrid vehicles and in vehicles with pure internal combustion engines.
- fuel advantageously relates to at least one hydrocarbon.
- a filtering device in the fuel intake system of the vehicle.
- a device is connected, on the one hand, to the tank and, on the other hand, to the exterior of the vehicle.
- this device comprises a carbon degassing filter hereinafter referred to as an “absorbent filter” (commonly referred to as “canister” by those skilled in the art) which makes it possible to absorb the hydrocarbon vapors from the tank so that the fuel fumes evacuated into the atmosphere by the evacuation device are in the form of a gas significantly purified of the polluting components contained in the hydrocarbon vapours.
- absorbent filter has a limited absorption capacity, called the maximum load of the filter.
- the absorbent filter is then said to be “full” or “filled” or else that it is saturated. In this case, the filter can no longer retain the hydrocarbon vapors which then escape into the atmosphere. More generally, whether the absorbent filter is saturated or not, it is characterized at a given instant by its load which corresponds to the percentage of mass of fuel stored in said filter with respect to its saturation value, that is to say by relative to its maximum load.
- the device is connected to the heat engine of the vehicle so as to allow the injection of the hydrocarbon vapors absorbed by the filter directly into the combustion chambers of the cylinders of the engine in operation in order to burn them.
- the absorbent filter is regularly charged with the hydrocarbon vapors coming from the tank then the engine control computer occasionally discharges it into the combustion chambers of the cylinders of the heat engine when said engine is in operation.
- a known solution for solving this problem consists in using a radial pump, called an active purge pump, between the filter and the engine in order to cause the hydrocarbon vapors to circulate in the purge circuit as far as the engine. In doing so, it is necessary to compensate for the quantity of hydrocarbon vapors introduced into the cylinders of the engine with a corresponding volume of air in order to respect the stoichiometric air-fuel ratio necessary for the proper combustion of the mixture in the heat engine.
- any flow control error involves a deviation relative to the stoichiometric ratio which leads to a variation in the hydrocarbon vapor concentration of the absorbent filter, impacting the estimation of said hydrocarbon vapor concentration in real time.
- the estimated concentration of hydrocarbon vapor can vary between 0 and 200%, whereas in practice, the actual concentration of hydrocarbon vapor cannot exceed 80%.
- the flow control is erroneous and deviates whenever any control error occurs.
- the system remains relatively stable because control is carried out in a closed loop via an oxygen sensor (called a lambda sensor) placed in the engine exhaust gas circuit.
- a lambda sensor oxygen sensor
- the hydrocarbon vapor concentration can be estimated from the pressure difference at the inlet and outlet of the active purge pump.
- This pressure difference depends on the speed of rotation of the pump and the density of the gases circulating in the pump.
- the speed of rotation of the pump being fixed by the need for a purge flow that can be absorbed by the motor, it can therefore vary very quickly, for example from 10,000 to 60,000 revolutions per minute in 1 second and from 60,000 to 10,000 rpm in 2 seconds.
- This change in speed implies a change in the operating point, modifying both the pressure and the temperature and therefore the density of the gases due to the adiabatic compression of the radial pump.
- this density is also a function of the ambient pressure (i.e.
- the ambient pressure is measured using a pressure sensor mounted on the purge circuit or provided by another sensor connected to the engine control, for example near the active purge pump.
- the temperature is measured using a sensor placed before or after the active purge pump and using a passive temperature sensor of the CTN type for "Negative Temperature Coefficient".
- the response time of the temperature measurement depends on the speed of the gas flow, which varies for example between 0 and 80 l/min, and can therefore prove to be particularly long.
- the response time can be of the order of 25 seconds when the speed of the flow is zero and of the order of 5 seconds when the speed of the flow is 80 l/min.
- Other temperature sensors, of the thermocouple type can be used.
- the response time of these sensors depends on their intrinsic technology, the cost of which increases inversely proportional to their response time.
- fast-response thermocouple sensors are used in laboratories and are too expensive to be used in mass-produced automotive vehicles.
- the response times of the low-cost temperature sensors used in the automotive industry prove to be too long to allow an accurate estimation of the concentration of hydrocarbon vapors in real time and to allow precise and rapid control. of the flow of gas entering the cylinders of the engine at the same instant. It therefore proves advantageous to propose a solution making it possible to at least partially remedy these drawbacks.
- One of the aims of the invention is to estimate the temperature of the gas flow circulating in the purge circuit precisely and quickly. Another object of the invention is to accurately measure the fuel vapor concentration of the gas flow circulating in the purge circuit. Another object of the invention is to precisely control the flow rate of the purged gas flow entering the cylinders of the engine.
- the invention firstly relates to a device for venting the vapors of a fuel stored in a tank of a hybrid or internal combustion motor vehicle, said vehicle comprising an internal combustion engine and a fuel tank. storing a fuel intended to be burned in said engine, said device comprising:
- an absorbent filter capable of filtering the vapors generated by the fuel stored in the said tank in the form of hydrocarbons
- a so-called "purge" circuit connected to the absorbent filter and intended to be connected to the engine and comprising: o a pump, preferably radial (or centrifugal), capable of allowing the circulation of a flow of gas containing vapors of hydrocarbons from the absorbent filter to the engine, o an “upstream” pressure sensor placed upstream of the pump, o a “downstream” pressure sensor placed downstream of the pump, o at least one temperature sensor configured to measure the temperature of the gas flow, preferably placed at least upstream of the pump, o a purge valve configured to switch between an open position, in which said purge valve allows circulation the flow of gas from the absorbent filter to the engine and a closed position in which the absorbent filter is isolated from the engine,
- control module configured to, in a purge mode: o receive the measurements from the upstream pressure sensor and the downstream pressure sensor, o calculate the pressure difference of the gas flow between the inlet and the outlet of the pump from the upstream and downstream pressure measurements received, o receive the temperature measurements from the temperature sensor, the rotational speed of the pump and the internal temperature of the pump, o determine the mass flow rate of the gas flow from the speed of rotation of the pump received, o determining the contribution of the adiabatic compression of the gas flow to the temperature of said gas flow from the calculated pressure difference and the temperature measurement of the gas flow received, o determining the contribution of the convection of the gas flow to the temperature of said gas flow from the measurement of the temperature of the gas flow received and the measurement of the internal temperature of the pump received, o determining the contribution of the conductio n of the flow at the temperature of the gas flow from the mass flow rate of the determined gas flow, the temperature of the gas flow received and the internal temperature measurement of the pump received, o estimate the temperature of the circulating gas
- the contribution of the adiabatic compression of the gas flow to the temperature of said gas flow TFiow_Adb is determined according to the following equation: where Tmiet is the temperature of the gas flow received from the flow temperature sensor upstream of the pump, PFIOW is the pressure of the gas flow received from the pressure sensor downstream, Pmiet is the pressure of the gas flow measured by the sensor of upstream pressure, and y is the ideal gas constant, considering y constant over the range of temperature and pressure considered, the contribution of the convection of the gas flow to the temperature of said gas flow from the temperature measurement of the gas flow received and the internal temperature measurement of the pump received is determined according to the following equation: where HeatFacconv represents the heat exchange by convection and radiation between the pump material and the gas flow, Tsody is the temperature of the pump body which corresponds to the internal temperature of the pump and Tmiet is the temperature of the flow of measured by the flow temperature sensor, and the contribution of flow conduction (or absorption) to the gas flow temperature from the determined gas flow mass flow rate, the
- control module is configured to calculate the concentration of fuel vapors in the stream from the temperature estimated according to the following equation: where p gas is the density of the gas in the pump, p ajr is the density of air at the pressure and temperature in the pump and pbut is the density of butane at the pressure and temperature in the pump.
- the radial pump is an electric pump.
- the temperature sensor is placed at the inlet and/or at the outlet of the pump.
- control module is configured to determine an end time for the hydrocarbon vapor purge, to close the purge valve and to control the pump so that said pump operates, in a so-called “off-mode” mode.
- purge at a predetermined minimum speed. Indeed, in the absence of a purge phase (i.e. no flow), if the turbine continues to rotate at very high speed, for example 60,000 rpm, the air flow on the blades of the pump becomes unstable, generating significant forces on the axis of rotation and on the turbine. If this mode of operation is prolonged, it leads to premature aging of the pump. It is therefore necessary to reduce the speed of rotation of the pump so that the instabilities disappear.
- the temperature in the pump cannot therefore be calculated from the temperature information provided by the sensor placed downstream of the pump.
- a model should be used instead of the sensor value.
- the temperature at the pump outlet will be equivalent to the temperature due to the adiabatic compression.
- the temperature sensor is placed close to the outlet of the pump, for example at a distance of less than 10 cm, the heat generated by the pump will spread to the sensor and the temperature value of the sensor can be used instead the value of the model. Also, since there is no flow, the heat generated by the pump is forced back to the pump inlet. Therefore, the temperature across the pump is almost homogeneous and the inlet temperature is then equal to the temperature of the adiabatic contribution.
- the invention also relates to a motor vehicle comprising a device as presented above, a heat engine comprising at least one cylinder and a storage tank for a fuel intended to be burned in said at least one cylinder of the engine.
- the invention also relates to a method for controlling the flow rate of a flow of gas circulating in a purge device as presented above, said method, implemented by the control module of said purge device, comprising the steps of :
- the contribution of the adiabatic compression of the gas flow to the temperature of said gas flow TFiow_Adb is determined according to the following equation: where Tmiet is the gas stream temperature received from the stream temperature sensor, PFIOW is the pressure of the gas flow received from the downstream pressure sensor, P iet is the pressure of the gas flow measured by the upstream pressure sensor, and y is the ideal gas constant, considering y constant over the range of temperature and pressure considered, the contribution of the convection of the gas flow to the temperature of said gas flow from the measurement of the temperature of the gas flow received and the measurement of the internal temperature of the pump received is determined according to the following equation: where HeatFacconv represents the heat exchange by convection and radiation between the material of the pump and the gas flow, Tsody is the internal temperature of the pump and Tmiet is the temperature of the gas flow measured by the flow temperature sensor and the contribution of flow conduction to the gas flow temperature from the determined gas flow mass flow rate, the received gas flow temperature and the received pump internal temperature measurement is determined according to the
- the calculation of the fuel vapor concentration of the flow from the estimated temperature is carried out according to the following equation: where p gas is the density of the gas in the pump, p ajr is the density of air at the pressure and temperature in the pump and pbut is the density of butane at the pressure and temperature in the pump.
- the method further comprises the steps, implemented by the control module, of determining a vapor purge end time of hydrocarbons, closing the purge valve and controlling the pump so that said pump operates, in a so-called “off-purge” mode, at a predetermined minimum speed.
- the invention also relates to a computer program product characterized in that it comprises a set of program code instructions which, when executed by one or more processors, configure the processor or processors to put implement a method as presented previously.
- Figure 1 schematically illustrates an embodiment of the vehicle according to the invention.
- FIG. 2 Figure 2 schematically illustrates an embodiment of the method according to the invention.
- the device according to the invention is intended to be mounted in a vehicle and allows both the evaporation of the vapors of the fuel stored in the tank of a hybrid or thermal motor vehicle and the purging of the hydrocarbon vapors generated by said fuel by combustion in the engine.
- the vehicle 1 comprises a device 10 according to the invention, a heat engine 20 and a tank 30 for storing a fuel intended to be burned in said engine 20.
- the engine comprises, in known manner, cylinders (not shown) making it possible to mix fuel and air in order to allow combustion thereof.
- the device 10 comprises an absorbent filter 110, a so-called “purge” circuit 120 and a control module 130.
- the absorbent filter 110 filters the vapors generated by the fuel stored in said tank 20 in the form of hydrocarbons. To this end, the absorbent filter 110 is connected to the tank 30 via a conduit 31.
- the absorbent filter 110 is connected to the outside of the vehicle (atmospheric air) by a conduit 111 in which is mounted an air valve 112.
- the air valve 112 is configured to switch between an open position, in which the air valve 112 allows the exhaust of the gases filtered by the absorbent filter 110 to the exterior, and a closed position in which the device 10 is isolated from the exterior of the vehicle 1.
- Air valve 112 is optional and can be used for leak detection.
- the absorbent filter 110 is also connected to the engine cylinders 20 via the purge circuit 120.
- the purge circuit 120 connects the absorbent filter 110 to the cylinders of the engine 20 of the vehicle 1 and comprises a radial (or centrifugal) pump 121, a so-called “upstream” pressure sensor 122, a so-called “downstream” pressure sensor 123, a flow temperature sensor 124 and a purge valve 125.
- the radial pump 121 which is preferably an electric pump, is able to allow the circulation of a flow of gas containing hydrocarbon vapors in the purge circuit 120, from the absorbent filter 110 to the motor 20
- the pump 121 is also able to measure its speed of rotation and its internal temperature, in particular to prevent overheating of its electric motor and its electronics, and to send these measurements to the control module.
- the upstream pressure sensor 122 is mounted upstream of the pump 121 and is able to measure the pressure of the gas flow circulating between the absorbent filter 110 and the pump 121.
- the downstream pressure sensor 123 is mounted downstream of the pump 121 and is able to measure the pressure of the gas flow circulating between the pump 121 and the purge valve 125.
- the downstream pressure sensor 123 uses a pressure model based on the air intake into the engine after the air filter to determine and provide the temperature of the gas flow at said downstream pressure sensor 123.
- the flow temperature sensor 124 is mounted in this example upstream of the pump 121 and is configured to measure the temperature of the gas flow circulating between the absorbent filter 110 and the pump 121.
- the flow temperature sensor 124 could be mounted downstream of the pump 121.
- the device 10 could include two temperature sensors: one downstream and one upstream of the pump 121 to improve the accuracy of the temperature model.
- the purge valve 125 is configured to switch between an open position, in which said purge valve 125 allows the flow of gas from the absorbent filter 110 to the motor 20 and a closed position in which the absorbent filter 110 is isolated from the motor 20.
- the purge valve 125 is able to be controlled by the control module 130 in opening or closing, in particular in several opening positions in order to allow the gas flow coming from the absorbent filter to be injected. 110 in the cylinders at different flow rates.
- the control module 130 is configured to control the pump 121, in particular the operating mode of said pump 121.
- the control module 130 is configured to receive the measurements from the upstream pressure sensor 122 and from the downstream pressure sensor 123.
- the control module 130 is configured to calculate the pressure difference of the gas flow between the inlet and the outlet of the pump 121 from the upstream and downstream pressure measurements received from the upstream pressure sensor 122 and from the sensor downstream pressure 123.
- the control module 130 is configured to receive the temperature measurements from the flow temperature sensor 124.
- the control module 130 is configured to determine periodically, preferably at a high frequency (ie continuously), the mass flow rate of the gas flow passing through the purge valve 125 and the pump 121.
- the gas flow passing through the pump 121 being the same as the gas flow passing through the purge valve 125, the mass flow rate of the gas flow can be determined from a predefined model using as inputs the pressure of the gas flow measured by the downstream pressure sensor 123, the temperature of the gas stream at the inlet of the purge valve 125, the temperature of the gas stream at the outlet of the purge valve 125 and the open position of the purge valve 125.
- temperature sensors can be arranged on either side of the purge valve 125 or by an independent model based on the electrical characteristics of the purge valve 125 or by the temperature information which can also be provided by the sensor d e pressure 123 or by a model using the model of the downstream temperature of the pump 121 in a manner known per se. Preferably, these last three pieces of information are combined to improve the precision according to the modes of use.
- the information on the opening position of the purge valve 125 can be received from the purge valve 125 or else determined by the control module 130, for example by using a model based on the command to open the purge valve. purge 125 taking into account the opening and closing time of the purge valve 125, such a model being known per se.
- the control module 130 is configured to receive measurements of the internal temperature of the pump 121 of the vehicle 1, for example via a CAN type data communication bus.
- the control module 130 is configured to determine the contribution of the adiabatic compression of the gas flow to the temperature of said gas flow from the calculated pressure difference and the gas flow temperature measurement received.
- the control module 130 is configured to determine the contribution of the convection of the gas flow to the temperature of said gas flow from the temperature measurement of the gas flow received and the internal temperature measurement of the pump 121.
- the control module 130 is configured to determine the contribution of the conduction of the flow to the temperature of the gas flow from the mass flow rate of the determined gas flow, the temperature of the gas flow received and the measurement of internal temperature of the pump 121.
- the control module 130 is configured to estimate the temperature of the gas flow circulating in the purge circuit 120 from the determined adiabatic compression, convection and conduction contributions.
- the control module 130 is configured to calculate the fuel vapor concentration of the flow from the estimated temperature.
- the control module 130 is configured to, in a so-called "purge” mode, control the purge valve 125 for controlling the flow rate of the flow entering the cylinders of the engine 20 according to the concentration calculated respecting the stoichiometric ratio of the combustion of the air-fuel mixture relating to said cylinders.
- the control module 130 includes a processor capable of implementing a set of instructions enabling these functions to be performed.
- control module 130 controls the pump 121 so that the pump 121 operates at a predetermined speed, for example minimum, and opens the purge valve 125.
- the sensor of upstream pressure 122 and the downstream pressure sensor 123 periodically measure the pressure of the gas flow and send their measurements to the control module 130 (respectively steps E1 and E2).
- the control module 130 calculates the pressure difference of the flow between the inlet and the outlet of the pump 121 from the current pressure values received from the upstream pressure sensor 122 and from the downstream pressure sensor 123 (step E3).
- the flow temperature sensor 124 also periodically measures the temperature of the gas flow and sends its measurements to the control module 130 (step E4).
- control module 130 also receives in a step E5 the rotational speed of the pump 121 and the internal temperature of the pump 121, sent directly by the pump 121, for example via a data communication bus from the vehicle 1.
- the control module 130 determines the mass flow rate of the gas flow from the rotational speed of the pump 121 and the pressure and temperature values on either side of the purge valve 125 (step E6 ).
- the speed of rotation of the pump makes it possible to characterize the section of passage of the air in the purge valve 125, this section being used to calculate the mass flow rate in a manner known per se.
- the pressure and temperature values on either side of the purge valve 125 can be established from a predefined model stored in a memory zone of the control module 130 can be used, this model being in the form a table having as inputs the ambient atmospheric pressure and the air flow entering the engine.
- the control module 130 determines:
- step E8 the contribution of the convection of the gas flow to the temperature of said gas flow from the measurement of the temperature of the gas flow received and the measurement of the internal temperature of the pump 121 received
- the contribution of the flow conduction to the temperature of the gas flow from the mass flow rate of the gas flow, the temperature of the gas flow received and the internal temperature measurement of the pump received (step E9) .
- the calculations require the temperature value of the body of the pump 121 rather than the internal temperature of the pump 121.
- the pump 121 comprises an internal sensor making it possible to measure the internal temperature but not the temperature of the pump body. 121.
- the internal temperature of the pump 121 and the temperature of the body of the pump 121 are not strictly identical, but their dynamics are similar.
- the internal temperature of pump 121 is therefore a good image of the temperature of the body of pump 121.
- TFIow_Adb The contribution of the adiabatic compression of the gas flow to the temperature of said gas flow TFIow_Adb is determined according to the following equation: where Tlnlet is the temperature of the gas flow received from the flow temperature sensor, PFlow is the pressure of the gas flow received from the downstream pressure sensor 123 and Plnlet is the pressure of the gas flow measured by the upstream pressure sensor 122 and gamma y is the ideal gas constant which is between 1.2 and 1.4 depending on the gases considered.
- the contribution of the gas flow convection to the temperature of said gas flow from the gas flow temperature measurement received and from the internal temperature measurement of the pump 121 received is determined according to the following equation : where HeatFacConv represents the heat exchange by convection and radiation between the pump material and the gas flow, TBody is the internal temperature of the pump 121 and Tlnlet is the temperature of the gas flow measured by the flow temperature sensor 124.
- the contribution of flow conduction to the temperature of the gas flow from the mass flow rate of the gas flow, the temperature of the gas flow received and the internal temperature measurement of the pump 121 received is determined according to the following equation: where is the mass flow rate of the gas stream passing through the pump, HeatFacCond represents the heat exchange by conduction between the material of the pump 121 and the gas stream, TBody is the internal temperature of the pump 121 and Tlnlet is the temperature of the gas flow measured by flow temperature sensor 124.
- the control module 130 calculates in a step E10 an estimate of the temperature of the gas flow circulating in the purge circuit 120 from the contributions of adiabatic compression, convection and conduction determined according to the following equation:
- control module 130 calculates in a step E11 the fuel vapor concentration of the gas flow from the estimated temperature according to the following formula:
- pgas is the density of the gas in pump 121
- par is the density of air at the pressure and temperature in pump 121
- pbut is the density of butane at the pressure and temperature in pump 121.
- control module 130 controls the purge valve 125 in a step E12 in order to control the flow rate of the flow entering the cylinders of the engine 20 according to the concentration calculated by respecting the stoichiometric ratio of the combustion of the mixture. air-fuel relating to said cylinders.
- This control can be carried out for example from a table stored in a memory zone accessible to the control module 130 and in which are stored correspondences between the hydrocarbon vapor concentration of the gas flow and the opening of the purge valve 125, these correspondences making it possible to respect the stoichiometric ratio of the engine 20.
- control module 130 determines that the purge mode is over (step E13), it closes the purge valve 125 (step E14) and controls the pump 121 (step E15) to prevent premature aging of the materials constituting the pump 121, for example by controlling the pump 121 to its minimum speed.
- the invention therefore advantageously makes it possible to control in a simple, reliable and precise manner the flow rate of the gas flow in the cylinders of the engine 20 in order to respect the stoichiometric ratio of the engine 20.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202280012075.4A CN116761937A (zh) | 2021-01-28 | 2022-01-21 | 充满碳氢化合物蒸汽的气流的清理装置和方法 |
KR1020237025887A KR20230132489A (ko) | 2021-01-28 | 2022-01-21 | 탄화수소 증기로 충전된 가스 스트림을 퍼지하기 위한디바이스 및 방법 |
EP22701583.1A EP4285016A1 (fr) | 2021-01-28 | 2022-01-21 | Dispositif et procede de purge d'un flux de gaz charge en vapeurs d'hydrocarbures |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR2100806A FR3119205A1 (fr) | 2021-01-28 | 2021-01-28 | Dispositif et procédé de purge d’un flux de gaz chargé en vapeurs d’hydrocarbures |
FRFR2100806 | 2021-01-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022161859A1 true WO2022161859A1 (fr) | 2022-08-04 |
Family
ID=75108553
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2022/051296 WO2022161859A1 (fr) | 2021-01-28 | 2022-01-21 | Dispositif et procede de purge d'un flux de gaz charge en vapeurs d'hydrocarbures |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP4285016A1 (fr) |
KR (1) | KR20230132489A (fr) |
CN (1) | CN116761937A (fr) |
FR (1) | FR3119205A1 (fr) |
WO (1) | WO2022161859A1 (fr) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0879950A2 (fr) * | 1997-05-22 | 1998-11-25 | General Motors Corporation | Modèle d'état de combustion pour moteur à combustion interne |
FR2961264A1 (fr) * | 2010-06-09 | 2011-12-16 | Peugeot Citroen Automobiles Sa | Procede de controle de la combustion d'un moteur thermique et procede de detection d'un dysfonctionnement dudit moteur |
WO2018162038A1 (fr) * | 2017-03-07 | 2018-09-13 | HELLA GmbH & Co. KGaA | Système de purge |
DE102017210768A1 (de) * | 2017-06-27 | 2018-12-27 | Continental Automotive Gmbh | Verfahren und Steuerungsvorrichtung zum Betreiben eines Tankentlüftungssystems einer Brennkraftmaschine |
DE102017223277A1 (de) * | 2017-12-19 | 2019-06-19 | Continental Automotive Gmbh | Vorrichtung zum Betreiben eines Tankentlüftungssystems einer Brennkraftmaschine |
DE102018220403A1 (de) * | 2018-11-28 | 2020-05-28 | Robert Bosch Gmbh | Tankentlüftungssystem und Verfahren zum Ermitteln einer Kohlenwasserstoffbeladung und/oder eines Kohlenwasserstoffstroms in dem Tankentlüftungssystem |
-
2021
- 2021-01-28 FR FR2100806A patent/FR3119205A1/fr active Pending
-
2022
- 2022-01-21 CN CN202280012075.4A patent/CN116761937A/zh active Pending
- 2022-01-21 KR KR1020237025887A patent/KR20230132489A/ko unknown
- 2022-01-21 EP EP22701583.1A patent/EP4285016A1/fr active Pending
- 2022-01-21 WO PCT/EP2022/051296 patent/WO2022161859A1/fr active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0879950A2 (fr) * | 1997-05-22 | 1998-11-25 | General Motors Corporation | Modèle d'état de combustion pour moteur à combustion interne |
FR2961264A1 (fr) * | 2010-06-09 | 2011-12-16 | Peugeot Citroen Automobiles Sa | Procede de controle de la combustion d'un moteur thermique et procede de detection d'un dysfonctionnement dudit moteur |
WO2018162038A1 (fr) * | 2017-03-07 | 2018-09-13 | HELLA GmbH & Co. KGaA | Système de purge |
DE102017210768A1 (de) * | 2017-06-27 | 2018-12-27 | Continental Automotive Gmbh | Verfahren und Steuerungsvorrichtung zum Betreiben eines Tankentlüftungssystems einer Brennkraftmaschine |
DE102017223277A1 (de) * | 2017-12-19 | 2019-06-19 | Continental Automotive Gmbh | Vorrichtung zum Betreiben eines Tankentlüftungssystems einer Brennkraftmaschine |
DE102018220403A1 (de) * | 2018-11-28 | 2020-05-28 | Robert Bosch Gmbh | Tankentlüftungssystem und Verfahren zum Ermitteln einer Kohlenwasserstoffbeladung und/oder eines Kohlenwasserstoffstroms in dem Tankentlüftungssystem |
Also Published As
Publication number | Publication date |
---|---|
EP4285016A1 (fr) | 2023-12-06 |
KR20230132489A (ko) | 2023-09-15 |
FR3119205A1 (fr) | 2022-07-29 |
CN116761937A (zh) | 2023-09-15 |
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